/* roulang page: index */
:root {
  --color-primary: #FF6B35;
  --color-secondary: #8B5CF6;
  --color-accent: #F59E0B;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-nav-bg: rgba(255,255,255,0.8);
  --font-family: 'PingFang SC','Microsoft YaHei','Noto Sans SC','system-ui',sans-serif;
  --font-size-base: 16px;
  --font-size-h1: 2.5rem;
  --font-size-h2: 2rem;
  --font-size-h3: 1.5rem;
  --font-size-h4: 1.125rem;
  --font-size-small: 0.875rem;
  --radius-card: 12px;
  --radius-button: 8px;
  --radius-nav: 50px;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-elevated: 0 8px 24px rgba(0,0,0,0.12);
  --spacing-section: 4rem;
  --spacing-block: 2rem;
  --container-max: 1200px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-secondary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; color: var(--color-text); }
h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); margin-bottom: 1rem; }
h3 { font-size: var(--font-size-h3); margin-bottom: 0.75rem; }
h4 { font-size: var(--font-size-h4); margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; color: var(--color-text); }
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: var(--spacing-section) 0; }
.section-title { text-align: center; margin-bottom: 2.5rem; position: relative; }
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 2px;
  margin: 0.75rem auto 0;
}
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-button);
  font-weight: 500;
  font-size: 1rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
  line-height: 1.4;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-elevated);
}
.btn-primary:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.btn-secondary {
  background: transparent;
  color: #fff;
  border-color: #fff;
}
.btn-secondary:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
  transform: translateY(-2px);
}
.btn-secondary:focus { outline: 2px solid #fff; outline-offset: 2px; }
.btn-cta {
  padding: 1rem 2rem;
  font-size: 1.125rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}
.btn-cta:hover {
  background: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-elevated);
}
.btn-cta:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.badge {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: 50px;
  font-size: var(--font-size-small);
  font-weight: 500;
  background: var(--color-accent);
  color: #fff;
}
.card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all 0.3s ease;
}
.card:hover {
  box-shadow: var(--shadow-elevated);
  transform: translateY(-4px);
}
.card-img { width: 100%; height: 180px; object-fit: cover; }
.card-body { padding: 1.25rem; }
.card-title { font-size: var(--font-size-h4); font-weight: 600; margin-bottom: 0.5rem; line-height: 1.4; }
.card-text { font-size: 0.95rem; color: var(--color-text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { font-size: var(--font-size-small); color: var(--color-text-muted); margin-top: 0.75rem; display: flex; align-items: center; gap: 0.75rem; }
.card-link { color: var(--color-primary); font-weight: 500; font-size: 0.9rem; display: inline-block; margin-top: 0.75rem; }
.card-link:hover { color: var(--color-secondary); }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
/* 导航 */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 100; padding: 1rem 0; transition: all 0.3s ease; }
.header.scrolled { background: var(--color-nav-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: 0 1px 4px rgba(0,0,0,0.06); }
.nav { display: flex; align-items: center; justify-content: space-between; max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; }
.nav-logo { display: flex; align-items: center; gap: 0.5rem; font-size: 1.25rem; font-weight: 700; color: var(--color-text); }
.nav-logo:hover { color: var(--color-primary); }
.nav-logo-icon { font-size: 1.5rem; }
.nav-links { display: flex; align-items: center; gap: 0.25rem; background: var(--color-nav-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-radius: var(--radius-nav); padding: 0.5rem 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.nav-links a { padding: 0.5rem 1rem; border-radius: var(--radius-button); font-size: 0.95rem; font-weight: 500; color: var(--color-text); transition: all 0.2s; position: relative; }
.nav-links a:hover { background: rgba(139, 92, 246, 0.12); color: var(--color-secondary); }
.nav-links a.active { color: var(--color-primary); background: rgba(255, 107, 53, 0.1); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 0.5rem; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all 0.3s; }
/* Hero */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; background-image: url('/assets/images/backpic/back-1.webp'); background-size: cover; background-position: center; background-attachment: fixed; }
.hero-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.55); }
.hero-content { position: relative; z-index: 2; text-align: center; color: #fff; max-width: 800px; padding: 0 1.5rem; }
.hero-content h1 { font-size: 3rem; color: #fff; margin-bottom: 1rem; text-shadow: 0 2px 12px rgba(0,0,0,0.3); }
.hero-content p { font-size: 1.25rem; color: rgba(255,255,255,0.9); margin-bottom: 2rem; text-shadow: 0 1px 6px rgba(0,0,0,0.2); }
.hero-content .btn-cta { font-size: 1.125rem; padding: 1rem 2.5rem; }
/* 痛点 */
.pain-points { background: var(--color-surface); }
.pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; max-width: 900px; margin: 0 auto; }
.pain-item { display: flex; gap: 1rem; align-items: flex-start; padding: 1.5rem; background: var(--color-bg); border-radius: var(--radius-card); transition: all 0.3s ease; }
.pain-item:hover { box-shadow: var(--shadow-elevated); transform: translateY(-2px); }
.pain-icon { font-size: 2rem; flex-shrink: 0; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: rgba(255, 107, 53, 0.1); border-radius: 12px; }
.pain-text h4 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.pain-text p { font-size: 0.95rem; color: var(--color-text-muted); margin-bottom: 0; }
/* 解决方案 */
.solution { background: linear-gradient(135deg, var(--color-primary), var(--color-secondary)); color: #fff; }
.solution .section-title h2 { color: #fff; }
.solution .section-title::after { background: #fff; }
.solution-wrap { display: flex; align-items: center; gap: 3rem; }
.solution-text { flex: 1; }
.solution-text h3 { color: #fff; font-size: 1.75rem; }
.solution-text p { color: rgba(255,255,255,0.9); font-size: 1.05rem; }
.solution-text .btn { margin-top: 1rem; }
.solution-image { flex: 1; border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-elevated); }
.solution-image img { width: 100%; height: auto; display: block; }
/* 最新资讯 */
.news { background: var(--color-bg); }
.news-card .card-img { height: 180px; background: linear-gradient(135deg, #e2e8f0, #cbd5e1); display: flex; align-items: center; justify-content: center; color: var(--color-text-muted); font-size: 0.9rem; }
.news-empty { text-align: center; padding: 3rem 1rem; color: var(--color-text-muted); }
.news-empty-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }
/* 成果 */
.achievements { background: var(--color-surface); }
.achievement-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; text-align: center; }
.achievement-item { padding: 2rem 1rem; }
.achievement-number { font-size: 2.5rem; font-weight: 700; color: var(--color-primary); line-height: 1.2; }
.achievement-label { font-size: 1rem; color: var(--color-text-muted); margin-top: 0.5rem; }
/* 证言 */
.testimonials { background: var(--color-bg); position: relative; }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.testimonial-card { background: var(--color-surface); border-radius: var(--radius-card); padding: 1.5rem; box-shadow: var(--shadow-card); transition: all 0.3s ease; }
.testimonial-card:hover { box-shadow: var(--shadow-elevated); transform: translateY(-4px); }
.testimonial-avatar { width: 56px; height: 56px; border-radius: 50%; object-fit: cover; margin-bottom: 1rem; background: linear-gradient(135deg, #e2e8f0, #cbd5e1); }
.testimonial-quote { font-size: 0.95rem; color: var(--color-text); line-height: 1.7; font-style: italic; margin-bottom: 1rem; }
.testimonial-author { font-weight: 600; color: var(--color-text); }
.testimonial-role { font-size: var(--font-size-small); color: var(--color-text-muted); }
/* FAQ */
.faq { background: var(--color-surface); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-card); margin-bottom: 0.75rem; overflow: hidden; transition: all 0.3s ease; }
.faq-item:hover { border-color: var(--color-primary); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem; cursor: pointer; background: var(--color-bg); font-weight: 600; font-size: 1.05rem; transition: background 0.2s; }
.faq-question:hover { background: rgba(255, 107, 53, 0.05); }
.faq-question .icon { font-size: 1.25rem; transition: transform 0.3s; flex-shrink: 0; color: var(--color-primary); }
.faq-item.active .faq-question .icon { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease; padding: 0 1.5rem; background: var(--color-surface); }
.faq-item.active .faq-answer { max-height: 300px; padding: 1rem 1.5rem 1.5rem; }
.faq-answer p { color: var(--color-text-muted); font-size: 0.95rem; margin-bottom: 0; }
/* CTA */
.cta-section { background: linear-gradient(135deg, #1E293B, #334155); color: #fff; text-align: center; }
.cta-section h2 { color: #fff; font-size: 2.2rem; }
.cta-section p { color: rgba(255,255,255,0.85); font-size: 1.1rem; max-width: 600px; margin: 0 auto 1.5rem; }
.cta-section .btn-cta { background: var(--color-primary); border: none; }
.cta-section .btn-cta:hover { background: var(--color-secondary); }
.cta-disclaimer { font-size: var(--font-size-small); color: rgba(255,255,255,0.5); margin-top: 1rem; }
/* 页脚 */
.footer { background: #0F172A; color: rgba(255,255,255,0.8); padding: 3rem 0 1.5rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; }
.footer-brand .nav-logo { color: #fff; margin-bottom: 0.75rem; }
.footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); max-width: 360px; }
.footer-links h4 { color: #fff; font-size: 1rem; margin-bottom: 1rem; }
.footer-links a { display: block; color: rgba(255,255,255,0.6); font-size: 0.9rem; padding: 0.35rem 0; transition: color 0.2s; }
.footer-links a:hover { color: var(--color-primary); }
.footer-social { display: flex; gap: 0.75rem; margin-top: 1rem; }
.footer-social a { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); transition: all 0.3s; font-size: 1rem; }
.footer-social a:hover { background: var(--color-primary); color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 2rem; padding-top: 1.5rem; text-align: center; font-size: var(--font-size-small); color: rgba(255,255,255,0.4); }
/* 移动端导航 */
@media (max-width: 768px) {
  :root { --font-size-h1: 1.8rem; --font-size-h2: 1.5rem; --font-size-h3: 1.25rem; --spacing-section: 2.5rem; }
  .nav-links { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100vh; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); flex-direction: column; justify-content: center; align-items: center; gap: 1.5rem; border-radius: 0; padding: 2rem; z-index: 99; }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.25rem; padding: 0.75rem 1.5rem; }
  .nav-toggle { display: flex; z-index: 100; position: relative; }
  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-content p { font-size: 1rem; }
  .pain-grid { grid-template-columns: 1fr; }
  .solution-wrap { flex-direction: column; }
  .achievement-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav { padding: 0 1rem; }
  .header { padding: 0.75rem 0; }
  .container { padding: 0 1rem; }
}
@media (min-width: 769px) and (max-width: 1023px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .achievement-grid { grid-template-columns: repeat(2, 1fr); }
  .pain-grid { gap: 1.5rem; }
}

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #FF6B35;
            --color-secondary: #8B5CF6;
            --color-accent: #F59E0B;
            --color-bg: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-text: #1E293B;
            --color-text-muted: #64748B;
            --color-text-disabled: #94A3B8;
            --color-border: #E2E8F0;
            --color-nav-bg: rgba(255,255,255,0.85);
            --color-footer-bg: #0F172A;
            --color-footer-text: #CBD5E1;
            --color-success: #10B981;
            --color-error: #EF4444;
            --font-family: 'PingFang SC','Microsoft YaHei','Noto Sans SC','system-ui',sans-serif;
            --font-size-base: 16px;
            --font-size-h1: 2.5rem;
            --font-size-h2: 2rem;
            --font-size-h3: 1.5rem;
            --font-size-h4: 1.125rem;
            --font-size-small: 0.875rem;
            --font-size-xs: 0.75rem;
            --radius-card: 12px;
            --radius-button: 8px;
            --radius-nav: 50px;
            --shadow-card: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-elevated: 0 8px 24px rgba(0,0,0,0.12);
            --shadow-nav: 0 4px 20px rgba(0,0,0,0.08);
            --spacing-section: 4rem;
            --spacing-block: 2rem;
            --container-max: 1200px;
            --content-max: 720px;
            --breakpoint-md: 768px;
            --breakpoint-lg: 1024px;
            --transition-base: 0.3s ease;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        a:hover {
            color: var(--color-secondary);
        }

        a:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
            border-radius: 2px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.2;
            color: var(--color-text);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
        }

        /* ===== Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            padding: 0.75rem 0;
            background: transparent;
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }

        .header.scrolled {
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-nav);
        }

        .nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: var(--radius-nav);
            box-shadow: var(--shadow-card);
            min-height: 56px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.125rem;
            color: var(--color-text);
            text-decoration: none;
            white-space: nowrap;
        }

        .nav-logo:hover {
            color: var(--color-primary);
        }

        .nav-logo-icon {
            font-size: 1.5rem;
            line-height: 1;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .nav-links a {
            display: block;
            padding: 0.5rem 1rem;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--color-text);
            text-decoration: none;
            border-radius: var(--radius-button);
            transition: background var(--transition-base), color var(--transition-base);
            position: relative;
        }

        .nav-links a:hover {
            background: rgba(139, 92, 246, 0.1);
            color: var(--color-secondary);
        }

        .nav-links a.active {
            color: var(--color-primary);
            background: rgba(255, 107, 53, 0.08);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-button);
            transition: background var(--transition-base);
        }

        .nav-toggle:hover {
            background: rgba(139, 92, 246, 0.1);
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 2px;
            margin: 3px 0;
            transition: transform var(--transition-base), opacity var(--transition-base);
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(8.5px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-8.5px) rotate(-45deg);
        }

        @media (max-width: 768px) {
            .nav {
                padding: 0 1rem;
                border-radius: 30px;
            }

            .nav-links {
                display: none;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 1rem;
                z-index: 99;
                padding: 2rem;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links a {
                font-size: 1.25rem;
                padding: 0.75rem 1.5rem;
            }

            .nav-links a.active::after {
                bottom: 4px;
                width: 30px;
                height: 3px;
            }

            .nav-toggle {
                display: flex;
                z-index: 100;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .nav-links a {
                padding: 0.4rem 0.75rem;
                font-size: 0.875rem;
            }
        }

        /* ===== Hero Banner (article) ===== */
        .article-hero {
            position: relative;
            width: 100%;
            min-height: 280px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            margin-top: 80px;
            border-radius: 0 0 24px 24px;
            overflow: hidden;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255, 107, 53, 0.7), rgba(139, 92, 246, 0.6));
            z-index: 1;
        }

        .article-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 3rem 1.5rem;
        }

        .article-hero h1 {
            font-size: 1.75rem;
            color: #fff;
            font-weight: 700;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
            max-width: 600px;
            margin: 0 auto;
        }

        @media (max-width: 768px) {
            .article-hero {
                min-height: 200px;
                margin-top: 70px;
                border-radius: 0 0 16px 16px;
            }

            .article-hero .container {
                padding: 2rem 1rem;
            }

            .article-hero h1 {
                font-size: 1.35rem;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 1rem 0 0.5rem;
            font-size: var(--font-size-small);
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.25rem 0.5rem;
        }

        .breadcrumb a {
            color: var(--color-text-muted);
            text-decoration: none;
            transition: color var(--transition-base);
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .breadcrumb .sep {
            color: var(--color-text-disabled);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--color-text);
            font-weight: 500;
        }

        /* ===== Article Header ===== */
        .article-header {
            padding: 1.5rem 0 0.5rem;
            border-bottom: 1px solid var(--color-border);
            margin-bottom: 1.5rem;
        }

        .article-header h1 {
            font-size: var(--font-size-h2);
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--color-text);
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.75rem 1.5rem;
            font-size: var(--font-size-small);
            color: var(--color-text-muted);
        }

        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 0.35rem;
        }

        .article-meta .meta-item .icon {
            font-size: 1rem;
            line-height: 1;
        }

        .article-meta .category-badge {
            display: inline-block;
            padding: 0.2rem 0.75rem;
            background: rgba(255, 107, 53, 0.1);
            color: var(--color-primary);
            border-radius: 50px;
            font-size: var(--font-size-xs);
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 1.5rem;
            }

            .article-meta {
                gap: 0.5rem 1rem;
            }
        }

        /* ===== Article Content ===== */
        .article-content-wrap {
            padding: 0 0 var(--spacing-section);
        }

        .article-content {
            max-width: var(--content-max);
            margin: 0 auto;
        }

        .article-body {
            line-height: 1.9;
            font-size: 1.0625rem;
            color: var(--color-text);
        }

        .article-body p {
            margin-bottom: 1.5rem;
        }

        .article-body h2 {
            font-size: 1.625rem;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--color-border);
        }

        .article-body h3 {
            font-size: 1.3rem;
            margin: 2rem 0 0.75rem;
        }

        .article-body h4 {
            font-size: 1.125rem;
            margin: 1.5rem 0 0.5rem;
            font-weight: 600;
        }

        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-card);
            margin: 1.5rem auto;
            box-shadow: var(--shadow-card);
        }

        .article-body blockquote {
            margin: 1.5rem 0;
            padding: 1rem 1.5rem;
            border-left: 4px solid var(--color-primary);
            background: rgba(255, 107, 53, 0.05);
            border-radius: 0 var(--radius-card) var(--radius-card) 0;
            color: var(--color-text-muted);
            font-style: italic;
        }

        .article-body blockquote p:last-child {
            margin-bottom: 0;
        }

        .article-body ul,
        .article-body ol {
            margin: 1rem 0 1.5rem;
            padding-left: 1.75rem;
        }

        .article-body ul {
            list-style: disc;
        }

        .article-body ol {
            list-style: decimal;
        }

        .article-body li {
            margin-bottom: 0.5rem;
        }

        .article-body code {
            font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
            background: #F1F5F9;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--color-secondary);
        }

        .article-body pre {
            margin: 1.5rem 0;
            padding: 1.25rem;
            background: #1E293B;
            border-radius: var(--radius-card);
            overflow-x: auto;
        }

        .article-body pre code {
            background: transparent;
            padding: 0;
            border-radius: 0;
            color: #E2E8F0;
            font-size: 0.9rem;
        }

        .article-body a {
            color: var(--color-secondary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body a:hover {
            color: var(--color-primary);
        }

        .article-body hr {
            margin: 2rem 0;
            border: none;
            height: 1px;
            background: var(--color-border);
        }

        @media (max-width: 768px) {
            .article-body {
                font-size: 1rem;
                line-height: 1.8;
            }

            .article-body h2 {
                font-size: 1.35rem;
            }

            .article-body h3 {
                font-size: 1.15rem;
            }

            .article-body blockquote {
                padding: 0.75rem 1rem;
            }
        }

        /* ===== Article Footer / Tags ===== */
        .article-footer {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--color-border);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .article-tags .tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 50px;
            font-size: var(--font-size-xs);
            color: var(--color-text-muted);
            transition: all var(--transition-base);
        }

        .article-tags .tag:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: rgba(255, 107, 53, 0.05);
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: var(--font-size-small);
            color: var(--color-text-muted);
        }

        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            font-size: 1rem;
            text-decoration: none;
            color: var(--color-text-muted);
            transition: all var(--transition-base);
        }

        .article-share a:hover {
            background: var(--color-primary);
            border-color: var(--color-primary);
            color: #fff;
        }

        /* ===== Related Posts ===== */
        .related-section {
            background: var(--color-surface);
            padding: var(--spacing-section) 0;
            border-top: 1px solid var(--color-border);
        }

        .related-section .section-title {
            font-size: var(--font-size-h3);
            margin-bottom: 1.5rem;
            text-align: center;
            position: relative;
        }

        .related-section .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: var(--color-primary);
            margin: 0.75rem auto 0;
            border-radius: 2px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .related-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: box-shadow var(--transition-base), transform var(--transition-base);
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
            color: inherit;
        }

        .related-card .card-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            flex-shrink: 0;
        }

        .related-card .card-image-placeholder {
            width: 100%;
            height: 180px;
            background: linear-gradient(135deg, #F1F5F9, #E2E8F0);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: var(--color-text-disabled);
            flex-shrink: 0;
        }

        .related-card .card-body {
            padding: 1rem 1.25rem 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .related-card .card-title {
            font-size: 1.0625rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 0.5rem;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .card-date {
            font-size: var(--font-size-xs);
            color: var(--color-text-muted);
            margin-top: auto;
        }

        .related-empty {
            text-align: center;
            padding: 3rem 1rem;
            color: var(--color-text-muted);
            font-size: var(--font-size-base);
        }

        .related-empty .empty-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            opacity: 0.4;
        }

        /* ===== CTA Section ===== */
        .article-cta {
            padding: 3rem 0;
            text-align: center;
            background: var(--color-bg);
        }

        .article-cta .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2rem;
            font-size: 1.0625rem;
            font-weight: 600;
            border-radius: var(--radius-button);
            border: none;
            cursor: pointer;
            text-decoration: none;
            transition: all var(--transition-base);
        }

        .article-cta .btn-primary {
            background: var(--color-primary);
            color: #fff;
        }

        .article-cta .btn-primary:hover {
            background: var(--color-secondary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
        }

        .article-cta .btn-primary:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
        }

        .article-cta .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
        }

        .article-cta .btn-outline:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 107, 53, 0.25);
        }

        /* ===== Not Found ===== */
        .not-found-area {
            padding: 4rem 1rem;
            text-align: center;
            max-width: 500px;
            margin: 0 auto;
        }

        .not-found-area .nf-icon {
            font-size: 4rem;
            margin-bottom: 1.5rem;
            opacity: 0.5;
        }

        .not-found-area h2 {
            font-size: 1.5rem;
            margin-bottom: 0.75rem;
        }

        .not-found-area p {
            color: var(--color-text-muted);
            margin-bottom: 1.5rem;
        }

        .not-found-area .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-button);
            border: none;
            cursor: pointer;
            text-decoration: none;
            background: var(--color-primary);
            color: #fff;
            transition: all var(--transition-base);
        }

        .not-found-area .btn:hover {
            background: var(--color-secondary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 3.5rem 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .footer-brand .nav-logo {
            color: #fff;
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }

        .footer-brand .nav-logo:hover {
            color: var(--color-primary);
        }

        .footer-brand p {
            font-size: var(--font-size-small);
            line-height: 1.7;
            color: var(--color-footer-text);
            margin-bottom: 1.25rem;
            max-width: 360px;
        }

        .footer-social {
            display: flex;
            gap: 0.75rem;
        }

        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: var(--color-footer-text);
            font-size: 1.125rem;
            text-decoration: none;
            transition: all var(--transition-base);
        }

        .footer-social a:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .footer-links h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-links a {
            display: block;
            padding: 0.3rem 0;
            font-size: var(--font-size-small);
            color: var(--color-footer-text);
            text-decoration: none;
            transition: color var(--transition-base), padding-left var(--transition-base);
        }

        .footer-links a:hover {
            color: var(--color-primary);
            padding-left: 4px;
        }

        .footer-bottom {
            text-align: center;
            padding: 1.5rem 0;
            font-size: var(--font-size-xs);
            color: rgba(255, 255, 255, 0.4);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }

            .footer-brand p {
                max-width: 100%;
            }

            .footer {
                padding: 2.5rem 0 0;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1.5fr 1fr 1fr;
                gap: 1.5rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }

        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--color-bg);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--color-border);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--color-text-muted);
        }

        /* ===== Selection ===== */
        ::selection {
            background: rgba(255, 107, 53, 0.2);
            color: var(--color-text);
        }

        /* ===== Print ===== */
        @media print {
            .header,
            .footer,
            .article-cta,
            .related-section {
                display: none !important;
            }

            .article-hero {
                margin-top: 0;
                min-height: auto;
                padding: 1rem 0;
                background: none !important;
            }

            .article-hero::before {
                display: none;
            }

            .article-hero h1 {
                color: var(--color-text);
                text-shadow: none;
            }

            .article-content-wrap {
                padding: 0;
            }

            body {
                background: #fff;
            }
        }

/* roulang page: category1 */
/* ===== CSS Variables ===== */
        :root {
            --color-primary: #FF6B35;
            --color-secondary: #8B5CF6;
            --color-accent: #F59E0B;
            --color-bg: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-text: #1E293B;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --color-nav-bg: rgba(255, 255, 255, 0.8);
            --color-footer-bg: #0F172A;
            --color-footer-text: #CBD5E1;
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'system-ui', sans-serif;
            --font-size-base: 16px;
            --font-size-h1: 2.5rem;
            --font-size-h2: 2rem;
            --font-size-h3: 1.5rem;
            --font-size-h4: 1.125rem;
            --font-size-small: 0.875rem;
            --radius-card: 12px;
            --radius-button: 8px;
            --radius-nav: 50px;
            --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.12);
            --spacing-section: 4rem;
            --spacing-block: 2rem;
            --container-max: 1200px;
            --breakpoint-md: 768px;
            --breakpoint-lg: 1024px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== Header / Navigation ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 1rem 0;
            display: flex;
            justify-content: center;
            pointer-events: none;
            transition: background 0.3s ease;
        }

        .header.scrolled {
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
        }

        .nav {
            pointer-events: auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: var(--radius-nav);
            padding: 0.5rem 2rem;
            max-width: var(--container-max);
            width: calc(100% - 3rem);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            transition: box-shadow 0.3s ease;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--color-text);
            white-space: nowrap;
        }

        .nav-logo-icon {
            font-size: 1.5rem;
            line-height: 1;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .nav-links a {
            padding: 0.5rem 1rem;
            border-radius: var(--radius-button);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: background 0.25s ease, color 0.25s ease;
            position: relative;
        }

        .nav-links a:hover {
            background: rgba(139, 92, 246, 0.08);
            color: var(--color-secondary);
        }

        .nav-links a.active {
            color: var(--color-primary);
            background: rgba(255, 107, 53, 0.08);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: 0.5rem;
            background: none;
            border: none;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(4px, 4px);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(4px, -4px);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 8rem 1.5rem 4rem;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: var(--font-size-h1);
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
            letter-spacing: 0.02em;
        }

        .hero p {
            font-size: 1.25rem;
            color: rgba(255, 255, 255, 0.9);
            max-width: 640px;
            margin: 0 auto 2rem;
            line-height: 1.6;
            text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
        }

        .hero .btn-primary {
            font-size: 1.125rem;
            padding: 1rem 2.5rem;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            color: #fff;
            padding: 0.35rem 1.25rem;
            border-radius: 50px;
            font-size: var(--font-size-small);
            margin-bottom: 1.5rem;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--color-primary);
            color: #fff;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius-button);
            font-weight: 500;
            font-size: 1rem;
            transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--color-secondary);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
        }

        .btn-primary:focus-visible {
            outline: 2px solid var(--color-secondary);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--color-primary);
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius-button);
            font-weight: 500;
            font-size: 1rem;
            border: 2px solid var(--color-primary);
            transition: background 0.3s ease, color 0.3s ease, transform 0.2s ease;
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-secondary:focus-visible {
            outline: 2px solid var(--color-secondary);
            outline-offset: 2px;
        }

        .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: var(--color-primary);
            padding: 1rem 2.5rem;
            border-radius: var(--radius-button);
            font-weight: 500;
            font-size: 1.125rem;
            transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
            border: none;
            cursor: pointer;
        }

        .btn-white:hover {
            background: #f1f5f9;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }

        .btn-white:focus-visible {
            outline: 2px solid var(--color-secondary);
            outline-offset: 2px;
        }

        /* ===== Section ===== */
        .section {
            padding: var(--spacing-section) 0;
        }

        .section-title {
            font-size: var(--font-size-h2);
            font-weight: 700;
            color: var(--color-text);
            text-align: center;
            margin-bottom: 0.75rem;
        }

        .section-subtitle {
            font-size: 1.125rem;
            color: var(--color-text-muted);
            text-align: center;
            max-width: 680px;
            margin: 0 auto var(--spacing-block);
            line-height: 1.6;
        }

        .section-bg-light {
            background: var(--color-surface);
        }

        .section-bg-alt {
            background: #F1F5F9;
        }

        .section-bg-gradient {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
        }

        .section-bg-gradient .section-title {
            color: #fff;
        }

        .section-bg-gradient .section-subtitle {
            color: rgba(255, 255, 255, 0.85);
        }

        /* ===== Cards Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 1.5rem;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
            overflow: hidden;
        }

        .card:hover {
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
        }

        .card-icon {
            font-size: 2.25rem;
            margin-bottom: 1rem;
            display: inline-block;
        }

        .card h3 {
            font-size: var(--font-size-h4);
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--color-text);
        }

        .card p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }

        .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: var(--radius-card) var(--radius-card) 0 0;
            margin: -1.5rem -1.5rem 1rem;
            width: calc(100% + 3rem);
        }

        .card-tag {
            display: inline-block;
            background: rgba(245, 158, 11, 0.12);
            color: #B45309;
            font-size: 0.75rem;
            font-weight: 500;
            padding: 0.2rem 0.75rem;
            border-radius: 50px;
            margin-bottom: 0.75rem;
        }

        .card .card-link {
            color: var(--color-primary);
            font-weight: 500;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            margin-top: 0.75rem;
            transition: color 0.3s ease;
        }

        .card .card-link:hover {
            color: var(--color-secondary);
        }

        /* ===== Intro Block (图文) ===== */
        .intro-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .intro-block.reverse {
            direction: rtl;
        }

        .intro-block.reverse>* {
            direction: ltr;
        }

        .intro-text h2 {
            font-size: var(--font-size-h2);
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--color-text);
        }

        .intro-text p {
            font-size: 1rem;
            color: var(--color-text-muted);
            line-height: 1.8;
            margin-bottom: 1.5rem;
        }

        .intro-image {
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-elevated);
            overflow: hidden;
        }

        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            border-radius: var(--radius-card);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2rem;
            counter-reset: step;
        }

        .step-item {
            text-align: center;
            padding: 2rem 1.5rem;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
        }

        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-elevated);
        }

        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
            font-size: 1.25rem;
            font-weight: 700;
            border-radius: 50%;
            margin: 0 auto 1rem;
        }

        .step-item h4 {
            font-size: var(--font-size-h4);
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--color-text);
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .faq-item {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: box-shadow 0.3s ease;
        }

        .faq-item:hover {
            box-shadow: var(--shadow-elevated);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.25rem 1.5rem;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--color-text);
            text-align: left;
            transition: background 0.3s ease;
            gap: 1rem;
        }

        .faq-question:hover {
            background: rgba(255, 107, 53, 0.04);
        }

        .faq-question .faq-icon {
            font-size: 1.25rem;
            transition: transform 0.3s ease;
            flex-shrink: 0;
            color: var(--color-primary);
        }

        .faq-item.active .faq-question .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 1.5rem;
            color: var(--color-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 1.5rem 1.25rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 5rem 1.5rem;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
            border-radius: 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: var(--font-size-h2);
            font-weight: 700;
            margin-bottom: 1rem;
            color: #fff;
        }

        .cta-section p {
            font-size: 1.125rem;
            color: rgba(255, 255, 255, 0.9);
            max-width: 600px;
            margin: 0 auto 2rem;
            line-height: 1.6;
        }

        .cta-section .btn-white {
            font-size: 1.125rem;
            padding: 1rem 2.5rem;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 3rem 0 1.5rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2rem;
        }

        .footer-brand .nav-logo {
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: #94A3B8;
            margin-bottom: 1.25rem;
            max-width: 400px;
        }

        .footer-social {
            display: flex;
            gap: 0.75rem;
        }

        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            font-size: 1.15rem;
            transition: background 0.3s ease, transform 0.2s ease;
            color: #CBD5E1;
        }

        .footer-social a:hover {
            background: var(--color-primary);
            transform: translateY(-2px);
            color: #fff;
        }

        .footer-links h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-links a {
            display: block;
            font-size: 0.9rem;
            color: #94A3B8;
            padding: 0.35rem 0;
            transition: color 0.3s ease;
        }

        .footer-links a:hover {
            color: var(--color-primary);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: #64748B;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root {
                --font-size-h1: 2.2rem;
                --font-size-h2: 1.8rem;
                --font-size-h3: 1.35rem;
                --spacing-section: 3rem;
            }

            .intro-block {
                gap: 2rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }

            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            :root {
                --font-size-h1: 1.8rem;
                --font-size-h2: 1.5rem;
                --font-size-h3: 1.2rem;
                --spacing-section: 2.5rem;
                --spacing-block: 1.5rem;
            }

            .container {
                padding: 0 1rem;
            }

            .header {
                padding: 0.75rem 0;
            }

            .nav {
                padding: 0.4rem 1.25rem;
                width: calc(100% - 2rem);
            }

            .nav-links {
                display: none;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(255, 255, 255, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 1.5rem;
                z-index: 999;
                padding: 2rem;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-links a {
                font-size: 1.25rem;
                padding: 0.75rem 1.5rem;
            }

            .nav-links a.active::after {
                bottom: 4px;
                width: 40%;
            }

            .nav-toggle {
                display: flex;
                z-index: 1001;
            }

            .hero {
                min-height: 50vh;
                padding: 6rem 1rem 3rem;
            }

            .hero h1 {
                font-size: var(--font-size-h1);
            }

            .hero p {
                font-size: 1rem;
            }

            .intro-block {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .intro-block.reverse {
                direction: ltr;
            }

            .intro-image img {
                height: 240px;
            }

            .card-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }

            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }

            .section {
                padding: 2rem 0;
            }

            .cta-section {
                padding: 3rem 1rem;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }

            .cta-section p {
                font-size: 1rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }

            .footer-brand p {
                max-width: 100%;
            }

            .btn-primary,
            .btn-secondary,
            .btn-white {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            :root {
                --font-size-h1: 1.6rem;
                --font-size-h2: 1.35rem;
            }

            .hero {
                min-height: 40vh;
                padding: 5rem 0.75rem 2.5rem;
            }

            .steps-grid {
                grid-template-columns: 1fr;
            }

            .card {
                padding: 1.25rem;
            }

            .card-img {
                height: 140px;
                margin: -1.25rem -1.25rem 0.75rem;
                width: calc(100% + 2.5rem);
            }

            .faq-question {
                padding: 1rem 1.25rem;
                font-size: 0.95rem;
            }

            .faq-answer {
                padding: 0 1.25rem;
                font-size: 0.9rem;
            }

            .faq-item.active .faq-answer {
                padding: 0 1.25rem 1rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }

        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .gap-1 {
            gap: 1rem;
        }
        .gap-2 {
            gap: 2rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
        }

        /* ===== Empty state / placeholder ===== */
        .empty-state {
            text-align: center;
            padding: 2rem 1rem;
            color: var(--color-text-muted);
            font-size: 0.95rem;
        }

        .empty-state .empty-icon {
            font-size: 2.5rem;
            margin-bottom: 0.75rem;
            opacity: 0.4;
        }

        /* ===== Smooth scroll offset ===== */
        .scroll-offset {
            scroll-margin-top: 100px;
        }

/* roulang page: category2 */
/* ========== Design Variables ========== */
        :root {
            --color-primary: #FF6B35;
            --color-secondary: #8B5CF6;
            --color-accent: #F59E0B;
            --color-bg: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-text: #1E293B;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --color-nav-bg: rgba(255, 255, 255, 0.85);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'system-ui', sans-serif;
            --font-size-base: 16px;
            --font-size-h1: 2.5rem;
            --font-size-h2: 2rem;
            --font-size-h3: 1.5rem;
            --font-size-h4: 1.125rem;
            --font-size-small: 0.875rem;
            --radius-card: 12px;
            --radius-button: 8px;
            --radius-nav: 50px;
            --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-elevated: 0 8px 24px rgba(0, 0, 0, 0.12);
            --spacing-section: 4rem;
            --spacing-block: 2rem;
            --container-max: 1200px;
            --breakpoint-md: 768px;
            --breakpoint-lg: 1024px;
        }

        /* ========== Reset & Base ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: var(--font-size-base);
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus {
            color: var(--color-secondary);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .section-padding {
            padding: var(--spacing-section) 0;
        }

        .text-center {
            text-align: center;
        }

        .text-muted {
            color: var(--color-text-muted);
        }

        .section-title {
            font-size: var(--font-size-h2);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--color-text);
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            max-width: 680px;
            margin: 0 auto 2.5rem;
            line-height: 1.7;
        }

        /* ========== Header & Navigation ========== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 0.75rem 1.5rem;
            background: transparent;
            transition: background 0.35s ease, box-shadow 0.35s ease;
        }

        .header.scrolled {
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
        }

        .nav {
            max-width: var(--container-max);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: var(--color-nav-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: var(--radius-nav);
            padding: 0.5rem 1.5rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            transition: box-shadow 0.3s ease;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-text);
            text-decoration: none;
            letter-spacing: 0.5px;
        }
        .nav-logo:hover {
            color: var(--color-primary);
        }
        .nav-logo-icon {
            font-size: 1.5rem;
            line-height: 1;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .nav-links a {
            display: inline-block;
            padding: 0.4rem 1rem;
            border-radius: var(--radius-button);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text);
            text-decoration: none;
            transition: background 0.25s ease, color 0.25s ease;
        }
        .nav-links a:hover {
            background: rgba(139, 92, 246, 0.12);
            color: var(--color-secondary);
        }
        .nav-links a.active {
            background: var(--color-primary);
            color: #fff;
        }
        .nav-links a.active:hover {
            background: var(--color-secondary);
            color: #fff;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 6px;
            border-radius: 6px;
            transition: background 0.2s ease;
        }
        .nav-toggle:hover {
            background: rgba(0, 0, 0, 0.05);
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            padding: 8rem 1.5rem 4rem;
            margin-top: 0;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            color: #fff;
        }
        .hero h1 {
            font-size: var(--font-size-h1);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1rem;
            letter-spacing: 1px;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        }
        .hero p {
            font-size: 1.15rem;
            line-height: 1.7;
            margin-bottom: 2rem;
            opacity: 0.92;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero .btn-primary {
            font-size: 1.1rem;
            padding: 0.9rem 2.4rem;
        }

        /* ========== Buttons ========== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--color-primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-button);
            padding: 0.75rem 1.8rem;
            font-size: 1rem;
            font-weight: 600;
            font-family: var(--font-family);
            cursor: pointer;
            transition: background 0.3s ease, transform 0.25s ease, box-shadow 0.3s ease;
            text-decoration: none;
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--color-secondary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--color-secondary);
            outline-offset: 3px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
            border-radius: var(--radius-button);
            padding: 0.7rem 1.6rem;
            font-size: 1rem;
            font-weight: 600;
            font-family: var(--font-family);
            cursor: pointer;
            transition: background 0.3s ease, color 0.3s ease, transform 0.25s ease, box-shadow 0.3s ease;
            text-decoration: none;
        }
        .btn-secondary:hover,
        .btn-secondary:focus {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 107, 53, 0.25);
        }
        .btn-secondary:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
        }

        .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #fff;
            color: var(--color-primary);
            border: none;
            border-radius: var(--radius-button);
            padding: 0.85rem 2.2rem;
            font-size: 1.05rem;
            font-weight: 600;
            font-family: var(--font-family);
            cursor: pointer;
            transition: background 0.3s ease, transform 0.25s ease, box-shadow 0.3s ease;
            text-decoration: none;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
        }
        .btn-white:hover,
        .btn-white:focus {
            background: var(--color-secondary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.3);
        }
        .btn-white:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 3px;
        }

        /* ========== Cards ========== */
        .card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 1.75rem;
            transition: box-shadow 0.35s ease, transform 0.35s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
        }
        .card-icon {
            font-size: 2.2rem;
            margin-bottom: 1rem;
            color: var(--color-primary);
            line-height: 1;
        }
        .card h3 {
            font-size: var(--font-size-h4);
            font-weight: 700;
            margin-bottom: 0.6rem;
            color: var(--color-text);
        }
        .card p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        /* ========== Grid ========== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }

        /* ========== Intro Section ========== */
        .intro-section {
            background: var(--color-surface);
        }
        .intro-wrapper {
            max-width: 860px;
            margin: 0 auto;
            text-align: center;
        }
        .intro-wrapper .intro-text {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--color-text-muted);
            margin-bottom: 1.5rem;
        }
        .intro-wrapper .intro-image {
            margin-top: 2rem;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-elevated);
            overflow: hidden;
        }
        .intro-wrapper .intro-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* ========== Features Section ========== */
        .features-section {
            background: var(--color-bg);
        }
        .feature-card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 2rem 1.75rem;
            box-shadow: var(--shadow-card);
            transition: box-shadow 0.35s ease, transform 0.35s ease;
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-elevated);
            transform: translateY(-4px);
        }
        .feature-card .fc-icon {
            font-size: 2.4rem;
            color: var(--color-primary);
            margin-bottom: 1rem;
            line-height: 1;
        }
        .feature-card h3 {
            font-size: var(--font-size-h4);
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        /* ========== Steps Section ========== */
        .steps-section {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
        }
        .steps-section .section-title {
            color: #fff;
        }
        .steps-section .section-subtitle {
            color: rgba(255, 255, 255, 0.85);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            counter-reset: step-counter;
        }
        .step-item {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            border-radius: var(--radius-card);
            padding: 2rem 1.5rem;
            text-align: center;
            counter-increment: step-counter;
            transition: background 0.3s ease, transform 0.3s ease;
        }
        .step-item:hover {
            background: rgba(255, 255, 255, 0.22);
            transform: translateY(-4px);
        }
        .step-item .step-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: rgba(255, 255, 255, 0.3);
            line-height: 1;
            margin-bottom: 0.75rem;
        }
        .step-item .step-number::before {
            content: "0" counter(step-counter);
        }
        .step-item h4 {
            font-size: var(--font-size-h4);
            font-weight: 700;
            margin-bottom: 0.4rem;
            color: #fff;
        }
        .step-item p {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.6;
        }

        /* ========== FAQ Section ========== */
        .faq-section {
            background: var(--color-surface);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--color-border);
            padding: 0.2rem 0;
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.75rem;
            width: 100%;
            background: none;
            border: none;
            padding: 1.25rem 0.5rem;
            font-size: 1.05rem;
            font-weight: 600;
            font-family: var(--font-family);
            text-align: left;
            color: var(--color-text);
            cursor: pointer;
            transition: color 0.25s ease;
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-question .faq-toggle {
            font-size: 1.2rem;
            color: var(--color-primary);
            transition: transform 0.35s ease;
            flex-shrink: 0;
        }
        .faq-question.open .faq-toggle {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 0.5rem;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 0.5rem 1.25rem;
        }
        .faq-answer p {
            color: var(--color-text-muted);
            line-height: 1.7;
            font-size: 0.98rem;
        }

        /* ========== CTA Section ========== */
        .cta-section {
            background: linear-gradient(135deg, #0F172A, #1E293B);
            color: #fff;
            text-align: center;
            padding: 4.5rem 1.5rem;
        }
        .cta-section h2 {
            font-size: var(--font-size-h2);
            font-weight: 800;
            margin-bottom: 0.75rem;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 2rem;
            line-height: 1.7;
        }
        .cta-section .btn-white {
            font-size: 1.1rem;
            padding: 0.9rem 2.4rem;
        }

        /* ========== Footer ========== */
        .footer {
            background: #0F172A;
            color: rgba(255, 255, 255, 0.8);
            padding: 3.5rem 1.5rem 1.5rem;
        }
        .footer .container {
            max-width: var(--container-max);
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-brand .nav-logo {
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .footer-brand .nav-logo:hover {
            color: var(--color-primary);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 380px;
        }
        .footer-social {
            display: flex;
            gap: 0.75rem;
            margin-top: 1rem;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: background 0.3s ease, color 0.3s ease, transform 0.25s ease;
        }
        .footer-social a:hover {
            background: var(--color-primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .footer-links h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            display: block;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            padding: 0.3rem 0;
            transition: color 0.25s ease;
        }
        .footer-links a:hover {
            color: var(--color-primary);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ========== Breadcrumbs ========== */
        .breadcrumbs {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.88rem;
            color: var(--color-text-muted);
            padding: 1.5rem 0 0.5rem;
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        .breadcrumbs a {
            color: var(--color-text-muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        .breadcrumbs a:hover {
            color: var(--color-primary);
        }
        .breadcrumbs .sep {
            color: var(--color-border);
            font-weight: 300;
        }
        .breadcrumbs .current {
            color: var(--color-text);
            font-weight: 500;
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --font-size-h1: 1.8rem;
                --font-size-h2: 1.5rem;
                --font-size-h3: 1.25rem;
                --spacing-section: 2.5rem;
            }

            .nav {
                padding: 0.4rem 1rem;
                border-radius: 30px;
            }
            .nav-links {
                display: none;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                align-items: center;
                justify-content: center;
                gap: 0.75rem;
                z-index: 999;
                padding: 2rem;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                font-size: 1.2rem;
                padding: 0.6rem 1.8rem;
            }
            .nav-toggle {
                display: flex;
                z-index: 1001;
                position: relative;
            }

            .hero {
                min-height: 50vh;
                padding: 6rem 1rem 3rem;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }

            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-brand p {
                max-width: 100%;
            }

            .section-padding {
                padding: 2rem 0;
            }
            .cta-section {
                padding: 3rem 1rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }

            .breadcrumbs {
                font-size: 0.8rem;
                padding: 1rem 1rem 0.25rem;
            }

            .faq-question {
                font-size: 0.98rem;
                padding: 1rem 0.25rem;
            }

            .card {
                padding: 1.25rem;
            }
            .feature-card {
                padding: 1.5rem 1.25rem;
            }
            .step-item {
                padding: 1.5rem 1rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .btn-primary,
            .btn-secondary,
            .btn-white {
                padding: 0.65rem 1.2rem;
                font-size: 0.92rem;
            }
            .hero .btn-primary {
                padding: 0.75rem 1.6rem;
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
            }
            .footer {
                padding: 2.5rem 1rem 1rem;
            }
            .nav-logo {
                font-size: 1rem;
            }
            .nav-logo-icon {
                font-size: 1.2rem;
            }
        }

        /* ========== Utility Animations ========== */
        .fade-up {
            opacity: 0;
            transform: translateY(20px);
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .badge {
            display: inline-block;
            background: rgba(245, 158, 11, 0.15);
            color: var(--color-accent);
            font-size: 0.78rem;
            font-weight: 600;
            padding: 0.2rem 0.7rem;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }

        /* ========== Scrollbar ========== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--color-bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--color-border);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--color-text-muted);
        }