/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --primary: #0a2f6c;
  --primary-light: #1a4a8a;
  --primary-dark: #061e45;
  --secondary: #f05a28;
  --secondary-light: #f5794a;
  --secondary-dark: #c9441a;
  --accent: #00b4d8;
  --accent-light: #48cae4;
  --bg-body: #f8fafc;
  --bg-white: #ffffff;
  --bg-light: #eef2f7;
  --bg-dark: #0b1a30;
  --bg-gradient: linear-gradient(135deg, #0a2f6c 0%, #061e45 50%, #0b1a30 100%);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a5a;
  --text-muted: #7a7a8a;
  --text-light: #c8d0dc;
  --text-white: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f0f2f5;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(10, 47, 108, 0.06);
  --shadow-md: 0 6px 24px rgba(10, 47, 108, 0.10);
  --shadow-lg: 0 16px 48px rgba(10, 47, 108, 0.14);
  --shadow-xl: 0 24px 64px rgba(10, 47, 108, 0.18);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --container-max: 1200px;
  --header-h: 72px;
  --space-section: 100px;
  --space-section-mobile: 60px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-body);
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--secondary); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }
p { margin-bottom: 1rem; color: var(--text-secondary); }
p:last-child { margin-bottom: 0; }
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
.section-padding { padding: var(--space-section) 0; }
@media (max-width: 768px) { .section-padding { padding: var(--space-section-mobile) 0; } }

/* ===== Header & Navigation ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226,232,240,0.6);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled { background: rgba(255,255,255,0.98); box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px; }
.logo a { color: var(--primary); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo a:hover { color: var(--primary-light); }
.logo-icon { width: 36px; height: 36px; background: var(--primary); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 1rem; }
.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a { font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); padding: 6px 0; position: relative; transition: color var(--transition); }
.main-nav a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--secondary); border-radius: 2px; transition: width var(--transition); }
.main-nav a:hover { color: var(--primary); }
.main-nav a:hover::after { width: 100%; }
.main-nav a.active { color: var(--primary); font-weight: 600; }
.main-nav a.active::after { width: 100%; background: var(--secondary); }
.nav-cta { display: inline-flex; align-items: center; gap: 8px; background: var(--secondary); color: #fff !important; padding: 10px 24px !important; border-radius: 50px; font-weight: 600; font-size: 0.9rem; transition: background var(--transition), transform var(--transition); }
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--secondary-dark); transform: translateY(-1px); color: #fff !important; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
.mobile-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 900px) {
  .main-nav { position: fixed; top: var(--header-h); left: 0; right: 0; background: var(--bg-white); flex-direction: column; gap: 0; padding: 16px 24px 24px; box-shadow: var(--shadow-lg); transform: translateY(-120%); opacity: 0; transition: transform 0.35s ease, opacity 0.35s ease; border-radius: 0 0 var(--radius-md) var(--radius-md); z-index: 999; }
  .main-nav.open { transform: translateY(0); opacity: 1; }
  .main-nav a { padding: 14px 0; width: 100%; border-bottom: 1px solid var(--border-light); font-size: 1.05rem; }
  .main-nav a:last-of-type { border-bottom: none; }
  .main-nav a::after { display: none; }
  .nav-cta { margin-top: 12px; justify-content: center; width: 100%; }
  .mobile-toggle { display: flex; }
}

/* ===== Hero Section ===== */
.hero {
  margin-top: var(--header-h);
  min-height: 85vh;
  display: flex; align-items: center;
  background: var(--bg-gradient);
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.12; mix-blend-mode: overlay;
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; padding: 60px 0; }
.hero-content { color: var(--text-white); }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,0.12); backdrop-filter: blur(8px); padding: 6px 18px; border-radius: 50px; font-size: 0.85rem; font-weight: 500; color: var(--text-light); margin-bottom: 24px; border: 1px solid rgba(255,255,255,0.10); }
.hero-badge i { color: var(--accent-light); }
.hero h1 { color: var(--text-white); margin-bottom: 20px; font-weight: 800; letter-spacing: -0.02em; }
.hero h1 span { color: var(--secondary); }
.hero p { font-size: 1.15rem; color: rgba(255,255,255,0.75); max-width: 520px; margin-bottom: 36px; line-height: 1.8; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary { display: inline-flex; align-items: center; gap: 10px; background: var(--secondary); color: #fff; padding: 14px 34px; border-radius: 50px; font-weight: 600; font-size: 1rem; transition: background var(--transition), transform var(--transition), box-shadow var(--transition); border: none; }
.btn-primary:hover { background: var(--secondary-dark); transform: translateY(-2px); box-shadow: 0 12px 32px rgba(240, 90, 40, 0.35); color: #fff; }
.btn-secondary { display: inline-flex; align-items: center; gap: 10px; background: transparent; color: var(--text-white); padding: 14px 34px; border-radius: 50px; font-weight: 600; font-size: 1rem; border: 1.5px solid rgba(255,255,255,0.30); transition: background var(--transition), border-color var(--transition), transform var(--transition); }
.btn-secondary:hover { background: rgba(255,255,255,0.10); border-color: rgba(255,255,255,0.60); transform: translateY(-2px); color: #fff; }
.hero-visual { display: flex; justify-content: center; align-items: center; position: relative; }
.hero-image-wrap { width: 100%; max-width: 520px; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xl); transform: perspective(800px) rotateY(-4deg); transition: transform var(--transition); }
.hero-image-wrap:hover { transform: perspective(800px) rotateY(0deg); }
.hero-image-wrap img { width: 100%; display: block; }
.hero-stats { display: flex; gap: 40px; margin-top: 40px; flex-wrap: wrap; }
.hero-stat-item { text-align: center; }
.hero-stat-number { font-size: 2.2rem; font-weight: 800; color: var(--text-white); line-height: 1.2; }
.hero-stat-number small { font-size: 1rem; color: var(--accent-light); }
.hero-stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-top: 4px; }

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; padding: 40px 0; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-image-wrap { transform: none; max-width: 400px; margin: 0 auto; }
}
@media (max-width: 600px) {
  .hero { min-height: 70vh; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn-primary, .hero-actions .btn-secondary { justify-content: center; }
  .hero-stats { gap: 24px; }
  .hero-stat-number { font-size: 1.6rem; }
}

/* ===== Section Titles ===== */
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { margin-bottom: 12px; }
.section-header .subtitle { font-size: 1.05rem; color: var(--text-muted); max-width: 640px; margin: 0 auto; line-height: 1.7; }
.section-tag { display: inline-flex; align-items: center; gap: 6px; background: rgba(10, 47, 108, 0.06); color: var(--primary); padding: 4px 16px; border-radius: 50px; font-size: 0.8rem; font-weight: 600; margin-bottom: 16px; letter-spacing: 0.5px; }

/* ===== Core Services ===== */
.core-section { background: var(--bg-white); }
.core-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.core-card { background: var(--bg-body); border-radius: var(--radius-md); padding: 36px 28px; border: 1px solid var(--border-color); transition: transform var(--transition), box-shadow var(--transition); }
.core-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.core-icon { width: 56px; height: 56px; background: var(--primary); border-radius: 14px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1.4rem; margin-bottom: 20px; }
.core-card h3 { margin-bottom: 12px; }
.core-card p { color: var(--text-muted); font-size: 0.95rem; }
.core-card .core-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-weight: 600; font-size: 0.9rem; color: var(--primary); }
.core-card .core-link i { transition: transform var(--transition); }
.core-card .core-link:hover i { transform: translateX(4px); }

@media (max-width: 900px) { .core-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .core-grid { grid-template-columns: 1fr; } }

/* ===== Categories / Solutions ===== */
.cat-section { background: var(--bg-light); }
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cat-card { background: var(--bg-white); border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-color); transition: transform var(--transition), box-shadow var(--transition); }
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.cat-card-image { height: 180px; overflow: hidden; }
.cat-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.cat-card:hover .cat-card-image img { transform: scale(1.05); }
.cat-card-body { padding: 20px 20px 24px; }
.cat-card-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
.cat-card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 12px; }
.cat-tag { display: inline-block; background: rgba(10, 47, 108, 0.06); color: var(--primary); padding: 2px 12px; border-radius: 50px; font-size: 0.75rem; font-weight: 600; }

@media (max-width: 1024px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .cat-grid { grid-template-columns: 1fr; } }

/* ===== Data & Impact ===== */
.data-section { background: var(--bg-dark); color: var(--text-white); position: relative; overflow: hidden; }
.data-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.08; }
.data-section .section-header h2 { color: var(--text-white); }
.data-section .section-header .subtitle { color: rgba(255,255,255,0.55); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; position: relative; z-index: 2; }
.data-item { text-align: center; padding: 28px 16px; background: rgba(255,255,255,0.04); border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.06); backdrop-filter: blur(4px); transition: background var(--transition), transform var(--transition); }
.data-item:hover { background: rgba(255,255,255,0.08); transform: translateY(-3px); }
.data-number { font-size: 2.8rem; font-weight: 800; color: var(--accent-light); line-height: 1.2; margin-bottom: 4px; }
.data-number .suffix { font-size: 1.2rem; color: var(--secondary); }
.data-label { font-size: 0.95rem; color: rgba(255,255,255,0.55); }

@media (max-width: 900px) { .data-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .data-grid { grid-template-columns: 1fr 1fr; gap: 16px; } .data-number { font-size: 2rem; } }

/* ===== Latest Posts (CMS) ===== */
.posts-section { background: var(--bg-white); }
.posts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.post-card { background: var(--bg-body); border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-color); transition: transform var(--transition), box-shadow var(--transition); }
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.post-card-image { height: 200px; overflow: hidden; background: var(--border-color); }
.post-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.post-card:hover .post-card-image img { transform: scale(1.05); }
.post-card-body { padding: 20px 22px 24px; }
.post-meta { display: flex; align-items: center; gap: 12px; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 10px; }
.post-meta .post-cat { background: rgba(10, 47, 108, 0.06); color: var(--primary); padding: 2px 12px; border-radius: 50px; font-weight: 600; }
.post-card-body h3 { font-size: 1.1rem; margin-bottom: 8px; line-height: 1.4; }
.post-card-body h3 a { color: var(--text-primary); }
.post-card-body h3 a:hover { color: var(--primary); }
.post-card-body p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }
.post-empty { grid-column: 1 / -1; text-align: center; padding: 40px 20px; color: var(--text-muted); background: var(--bg-light); border-radius: var(--radius-md); font-size: 1rem; }

@media (max-width: 1024px) { .posts-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .posts-grid { grid-template-columns: 1fr; } }

/* ===== Process / Workflow ===== */
.process-section { background: var(--bg-light); }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
.process-step { text-align: center; padding: 32px 16px; background: var(--bg-white); border-radius: var(--radius-md); border: 1px solid var(--border-color); position: relative; transition: transform var(--transition), box-shadow var(--transition); }
.process-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.process-step .step-num { width: 48px; height: 48px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.2rem; margin: 0 auto 16px; }
.process-step h4 { margin-bottom: 8px; }
.process-step p { font-size: 0.9rem; color: var(--text-muted); }
.process-arrow { display: none; }
@media (min-width: 1025px) {
  .process-grid { position: relative; }
  .process-step:not(:last-child)::after { content: '→'; position: absolute; right: -16px; top: 50%; transform: translateY(-50%); font-size: 1.4rem; color: var(--text-muted); opacity: 0.3; font-weight: 300; }
}
@media (max-width: 900px) { .process-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .process-grid { grid-template-columns: 1fr; } }

/* ===== FAQ ===== */
.faq-section { background: var(--bg-white); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border-color); padding: 20px 0; }
.faq-question { display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.05rem; color: var(--text-primary); padding: 4px 0; transition: color var(--transition); }
.faq-question:hover { color: var(--primary); }
.faq-question i { font-size: 1.1rem; color: var(--text-muted); transition: transform var(--transition); }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0 16px 0 0; }
.faq-item.active .faq-answer { max-height: 300px; padding: 12px 16px 0 0; }
.faq-answer p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }

/* ===== CTA ===== */
.cta-section { background: var(--bg-gradient); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat; opacity: 0.08; mix-blend-mode: overlay; }
.cta-box { text-align: center; position: relative; z-index: 2; padding: 20px 0; }
.cta-box h2 { color: var(--text-white); margin-bottom: 16px; }
.cta-box p { color: rgba(255,255,255,0.65); font-size: 1.1rem; max-width: 600px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-box .btn-primary { background: var(--secondary); }
.cta-box .btn-primary:hover { background: var(--secondary-dark); }
.cta-box .btn-secondary { border-color: rgba(255,255,255,0.35); }
.cta-box .btn-secondary:hover { border-color: rgba(255,255,255,0.7); background: rgba(255,255,255,0.08); }

/* ===== Footer ===== */
.site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.70); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand .logo a { color: var(--text-white); }
.footer-brand p { color: rgba(255,255,255,0.45); font-size: 0.9rem; max-width: 320px; }
.footer-social { display: flex; gap: 12px; margin-top: 20px; }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.50); font-size: 1.1rem; transition: background var(--transition), color var(--transition); }
.footer-social a:hover { background: var(--secondary); color: #fff; }
.footer-col h4 { color: var(--text-white); font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col a { display: block; color: rgba(255,255,255,0.45); font-size: 0.9rem; padding: 6px 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.35); }
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: var(--accent-light); }

@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr; text-align: center; } .footer-brand p { margin: 0 auto; } .footer-social { justify-content: center; } .footer-bottom { flex-direction: column; text-align: center; } }

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.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; }
::-webkit-scrollbar-track { background: var(--bg-light); }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-light); }

/* ===== Selection ===== */
::selection { background: var(--primary); color: #fff; }

/* roulang page: article */
:root {
        --primary: #2563eb;
        --primary-dark: #1d4ed8;
        --primary-light: #dbeafe;
        --accent: #f59e0b;
        --accent-dark: #d97706;
        --bg: #ffffff;
        --bg-alt: #f8fafc;
        --bg-dark: #0f172a;
        --text: #1e293b;
        --text-light: #64748b;
        --text-white: #f1f5f9;
        --border: #e2e8f0;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 4px 24px rgba(0,0,0,0.06);
        --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
        --max-width: 1200px;
        --header-h: 72px;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body { font-family: var(--font); font-size: 16px; line-height: 1.7; color: var(--text); background: var(--bg); }
    a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    ul, ol { list-style: none; }
    .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
    .container-narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }
    .section { padding: 80px 0; }
    .section-alt { background: var(--bg-alt); }
    .section-dark { background: var(--bg-dark); color: var(--text-white); }
    .tag { display: inline-block; padding: 4px 14px; border-radius: 100px; font-size: 0.8rem; font-weight: 600; background: var(--primary-light); color: var(--primary); letter-spacing: 0.3px; }
    .tag-accent { background: #fef3c7; color: var(--accent-dark); }
    .tag-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text-light); }
    .badge { display: inline-flex; align-items: center; gap: 4px; padding: 2px 12px; border-radius: 100px; font-size: 0.75rem; font-weight: 600; background: var(--primary-light); color: var(--primary); }
    .badge i { font-size: 0.65rem; }
    .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: 100px; font-weight: 600; font-size: 0.95rem; border: none; cursor: pointer; transition: all var(--transition); text-decoration: none; }
    .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.30); }
    .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.35); color: #fff; }
    .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
    .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
    .btn-accent { background: var(--accent); color: #1e293b; box-shadow: 0 4px 14px rgba(245,158,11,0.30); }
    .btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(245,158,11,0.35); }
    .btn-sm { padding: 8px 20px; font-size: 0.85rem; }
    .btn-lg { padding: 16px 36px; font-size: 1.05rem; }
    .text-center { text-align: center; }
    .text-light { color: var(--text-light); }
    .mt-1 { margin-top: 8px; }
    .mt-2 { margin-top: 16px; }
    .mt-3 { margin-top: 24px; }
    .mt-4 { margin-top: 32px; }
    .mt-5 { margin-top: 48px; }
    .mb-2 { margin-bottom: 16px; }
    .mb-3 { margin-bottom: 24px; }
    .mb-4 { margin-bottom: 32px; }
    .gap-2 { gap: 16px; }
    .gap-3 { gap: 24px; }
    .flex { display: flex; }
    .flex-wrap { flex-wrap: wrap; }
    .flex-center { align-items: center; justify-content: center; }
    .flex-between { align-items: center; justify-content: space-between; }
    .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
    .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    @media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 768px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } .section { padding: 56px 0; } .container { padding: 0 16px; } }

    /* ===== Header / Nav ===== */
    .site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--header-h); background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); transition: all var(--transition); }
    .site-header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
    .logo a { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.35rem; color: var(--text); text-decoration: none; }
    .logo a:hover { color: var(--primary); }
    .logo-icon { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: var(--primary); color: #fff; border-radius: 8px; font-weight: 900; font-size: 1.2rem; }
    .main-nav { display: flex; align-items: center; gap: 6px; }
    .main-nav a { padding: 8px 18px; border-radius: 100px; font-size: 0.92rem; font-weight: 500; color: var(--text-light); transition: all var(--transition); text-decoration: none; position: relative; }
    .main-nav a:hover { color: var(--primary); background: var(--primary-light); }
    .main-nav a.active { color: #fff; background: var(--primary); box-shadow: 0 4px 12px rgba(37,99,235,0.25); }
    .main-nav a.nav-cta { background: var(--accent); color: #1e293b; font-weight: 600; padding: 8px 22px; box-shadow: 0 4px 12px rgba(245,158,11,0.25); }
    .main-nav a.nav-cta:hover { background: var(--accent-dark); transform: translateY(-1px); }
    .nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; border-radius: 8px; transition: background var(--transition); }
    .nav-toggle span { display: block; width: 26px; height: 2.5px; background: var(--text); border-radius: 4px; transition: all var(--transition); }
    .nav-toggle:hover { background: var(--bg-alt); }
    @media (max-width: 900px) {
        .main-nav { position: fixed; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(20px); flex-direction: column; padding: 20px 24px; gap: 8px; border-bottom: 1px solid var(--border); transform: translateY(-120%); opacity: 0; pointer-events: none; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: var(--shadow-lg); }
        .main-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
        .main-nav a { width: 100%; text-align: center; padding: 12px 18px; }
        .nav-toggle { display: flex; }
    }

    /* ===== Article Banner ===== */
    .article-banner { padding-top: calc(var(--header-h) + 40px); padding-bottom: 48px; background: var(--bg-alt); position: relative; overflow: hidden; }
    .article-banner::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center/cover no-repeat; opacity: 0.08; pointer-events: none; }
    .article-banner .container-narrow { position: relative; z-index: 1; }
    .article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin-bottom: 20px; }
    .article-meta .meta-item { display: flex; align-items: center; gap: 6px; font-size: 0.88rem; color: var(--text-light); }
    .article-meta .meta-item i { font-size: 0.8rem; color: var(--primary); }
    .article-banner h1 { font-size: 2.2rem; font-weight: 800; line-height: 1.3; color: var(--text); margin-bottom: 16px; }
    .article-banner .article-desc { font-size: 1.1rem; color: var(--text-light); line-height: 1.6; max-width: 720px; }
    @media (max-width: 768px) { .article-banner h1 { font-size: 1.6rem; } .article-banner .article-desc { font-size: 0.95rem; } .article-meta { gap: 8px 16px; } }

    /* ===== Article Body ===== */
    .article-body { padding: 48px 0 64px; }
    .article-content { font-size: 1.05rem; line-height: 1.9; color: var(--text); }
    .article-content p { margin-bottom: 1.6em; }
    .article-content h2 { font-size: 1.6rem; font-weight: 700; margin-top: 2em; margin-bottom: 0.8em; color: var(--text); }
    .article-content h3 { font-size: 1.25rem; font-weight: 700; margin-top: 1.6em; margin-bottom: 0.6em; color: var(--text); }
    .article-content ul, .article-content ol { margin-bottom: 1.6em; padding-left: 1.5em; }
    .article-content li { margin-bottom: 0.5em; list-style: disc; }
    .article-content ol li { list-style: decimal; }
    .article-content blockquote { border-left: 4px solid var(--primary); background: var(--bg-alt); padding: 16px 24px; margin: 1.6em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-light); font-style: italic; }
    .article-content img { border-radius: var(--radius); margin: 1.6em 0; box-shadow: var(--shadow); }
    .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
    .article-content a:hover { color: var(--primary-dark); }
    .article-content .code-block { background: var(--bg-dark); color: #e2e8f0; padding: 20px 24px; border-radius: var(--radius-sm); overflow-x: auto; font-family: 'JetBrains Mono', monospace; font-size: 0.9rem; margin: 1.6em 0; }
    .article-footer-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
    .article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .article-share { display: flex; align-items: center; gap: 12px; }
    .article-share span { font-size: 0.88rem; color: var(--text-light); }
    .article-share a { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: var(--bg-alt); color: var(--text-light); transition: all var(--transition); }
    .article-share a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
    .article-nav { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; margin-top: 48px; }
    .article-nav a { display: flex; align-items: center; gap: 10px; padding: 14px 24px; border-radius: var(--radius-sm); background: var(--bg-alt); color: var(--text); font-weight: 500; transition: all var(--transition); flex: 1; min-width: 200px; }
    .article-nav a:hover { background: var(--primary-light); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow); }
    .article-nav .nav-next { text-align: right; justify-content: flex-end; }
    @media (max-width: 640px) { .article-content { font-size: 0.95rem; } .article-footer-bar { flex-direction: column; align-items: flex-start; } .article-nav { flex-direction: column; } .article-nav a { justify-content: center; text-align: center; } }

    /* ===== Related Posts ===== */
    .related-wrap { background: var(--bg-alt); }
    .related-wrap .section-title { text-align: center; margin-bottom: 40px; }
    .related-wrap .section-title h2 { font-size: 1.75rem; font-weight: 800; }
    .related-wrap .section-title p { color: var(--text-light); margin-top: 8px; }
    .related-card { background: var(--bg); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: all var(--transition); display: flex; flex-direction: column; }
    .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
    .related-card .card-img { height: 180px; background: var(--border); overflow: hidden; }
    .related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
    .related-card:hover .card-img img { transform: scale(1.05); }
    .related-card .card-body { padding: 20px 24px 24px; flex: 1; display: flex; flex-direction: column; }
    .related-card .card-body h3 { font-size: 1.05rem; font-weight: 700; margin: 8px 0 10px; line-height: 1.4; }
    .related-card .card-body h3 a { color: var(--text); text-decoration: none; }
    .related-card .card-body h3 a:hover { color: var(--primary); }
    .related-card .card-body p { font-size: 0.88rem; color: var(--text-light); margin-bottom: 12px; flex: 1; }
    .related-card .card-meta { display: flex; align-items: center; gap: 16px; font-size: 0.78rem; color: var(--text-light); }
    @media (max-width: 768px) { .related-card .card-img { height: 140px; } }

    /* ===== FAQ ===== */
    .faq-section { padding: 64px 0; }
    .faq-section .section-title { text-align: center; margin-bottom: 40px; }
    .faq-section .section-title h2 { font-size: 1.75rem; font-weight: 800; }
    .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
    .faq-item { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; transition: border-color var(--transition); }
    .faq-item:hover { border-color: var(--primary); }
    .faq-question { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; font-weight: 600; font-size: 1rem; cursor: pointer; background: none; border: none; width: 100%; text-align: left; color: var(--text); transition: color var(--transition); }
    .faq-question i { transition: transform var(--transition); color: var(--primary); font-size: 0.85rem; }
    .faq-question.open i { transform: rotate(180deg); }
    .faq-answer { padding: 0 24px 18px; font-size: 0.92rem; color: var(--text-light); line-height: 1.7; display: none; }
    .faq-answer.open { display: block; }

    /* ===== CTA ===== */
    .cta-block { background: var(--bg-dark); color: var(--text-white); padding: 72px 0; text-align: center; position: relative; overflow: hidden; }
    .cta-block::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-3.png') center/cover no-repeat; opacity: 0.06; pointer-events: none; }
    .cta-block h2 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
    .cta-block p { font-size: 1.1rem; color: #94a3b8; max-width: 600px; margin: 0 auto 32px; }
    .cta-block .btn { font-size: 1.05rem; padding: 16px 40px; }
    @media (max-width: 640px) { .cta-block h2 { font-size: 1.4rem; } .cta-block p { font-size: 0.95rem; } }

    /* ===== Footer ===== */
    .site-footer { background: var(--bg-dark); color: var(--text-white); padding: 56px 0 0; }
    .site-footer a { color: #94a3b8; transition: color var(--transition); }
    .site-footer a:hover { color: #fff; }
    .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid #1e293b; }
    .footer-brand .logo a { color: #fff; }
    .footer-brand p { margin-top: 16px; font-size: 0.9rem; color: #94a3b8; line-height: 1.7; }
    .footer-social { display: flex; gap: 16px; margin-top: 20px; }
    .footer-social a { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; background: #1e293b; color: #94a3b8; font-size: 1.1rem; transition: all var(--transition); }
    .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
    .footer-col h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 18px; color: #fff; }
    .footer-col a { display: block; padding: 5px 0; font-size: 0.88rem; color: #94a3b8; }
    .footer-col a:hover { color: #fff; padding-left: 4px; }
    .footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; padding: 24px 0; gap: 12px; font-size: 0.82rem; color: #64748b; }
    .footer-bottom a { color: #94a3b8; }
    .footer-bottom a:hover { color: #fff; }
    @media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
    @media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; text-align: center; } }

/* roulang page: category1 */
/* ===== :root 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #0f3a8e;
            --secondary: #0ea5e9;
            --secondary-light: #38bdf8;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg-dark: #0b1120;
            --bg-dark-alt: #111827;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --text-white: #f1f5f9;
            --text-light: #94a3b8;
            --text-dark: #0f172a;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --border-dark: #1e293b;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
            --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.16);
            --shadow-glow: 0 0 30px rgba(26, 86, 219, 0.25);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

        /* ===== 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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-dark);
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== 通用组件 ===== */
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            color: var(--primary);
            background: rgba(26, 86, 219, 0.08);
            padding: 4px 14px;
            border-radius: 100px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            color: var(--text-dark);
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 680px;
            line-height: 1.6;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-sub {
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.6rem;
            }
            .section-sub {
                font-size: 1rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 12px 28px;
            border-radius: 100px;
            transition: all var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26, 86, 219, 0.4);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-dark);
            border-color: var(--border-light);
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(26, 86, 219, 0.04);
            transform: translateY(-2px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary-dark);
            border-color: #fff;
            box-shadow: var(--shadow-md);
        }
        .btn-white:hover {
            background: var(--bg-light);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            color: var(--primary-dark);
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
        }
        .badge-accent {
            background: rgba(245, 158, 11, 0.12);
            color: #b45309;
        }
        .badge-green {
            background: rgba(16, 185, 129, 0.12);
            color: #065f46;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(11, 17, 32, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            text-decoration: none;
            letter-spacing: -0.02em;
        }
        .logo a:hover {
            color: #fff;
        }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 10px;
            font-size: 1.2rem;
            font-weight: 800;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.35);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
            gap: 6px;
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.06);
        }
        .main-nav a.active {
            color: #fff;
            background: rgba(59, 130, 246, 0.2);
            box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.15);
        }
        .main-nav .nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 8px 20px;
            border-radius: 100px;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
        }
        .main-nav .nav-cta:hover {
            background: var(--primary-light);
            transform: translateY(-1px);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.4);
        }

        /* Mobile Toggle */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        @media (max-width: 900px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(11, 17, 32, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-lg);
                max-height: calc(100vh - var(--header-h));
                overflow-y: auto;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
            }
            .main-nav .nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .logo a {
                font-size: 1.1rem;
                gap: 8px;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 1rem;
                border-radius: 8px;
            }
            .main-nav {
                padding: 16px 16px 24px;
            }
        }

        /* ===== 页面留白 ===== */
        main {
            padding-top: var(--header-h);
        }
        section {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            section {
                padding: 52px 0;
            }
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 120px 0 100px;
            background: var(--bg-dark);
            overflow: hidden;
            min-height: 380px;
            display: flex;
            align-items: center;
        }
        .page-hero .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.3;
            transform: scale(1.05);
            filter: saturate(0.8);
        }
        .page-hero .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 17, 32, 0.88) 0%, rgba(11, 17, 32, 0.6) 60%, rgba(11, 17, 32, 0.3) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.15;
        }
        .page-hero h1 .highlight {
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-hero .hero-desc {
            font-size: 1.15rem;
            color: var(--text-light);
            max-width: 640px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }
        .page-hero .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .page-hero {
                padding: 100px 0 72px;
                min-height: auto;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .page-hero .hero-desc {
                font-size: 1rem;
            }
            .page-hero .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .page-hero .hero-actions .btn {
                width: 100%;
                max-width: 300px;
            }
        }
        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.6rem;
            }
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 24px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary-light);
        }
        .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }
        .breadcrumb .current {
            color: var(--primary-light);
        }

        /* ===== 方案卡片网格 ===== */
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .solution-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px 36px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .solution-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .solution-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(26, 86, 219, 0.15);
        }
        .solution-card:hover::before {
            opacity: 1;
        }
        .solution-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: rgba(26, 86, 219, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 18px;
            transition: all var(--transition);
        }
        .solution-card:hover .card-icon {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 20px rgba(26, 86, 219, 0.25);
        }
        .solution-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        .solution-card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 16px;
        }
        .solution-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: auto;
        }
        .solution-card .card-tags .badge {
            font-size: 0.7rem;
        }
        .solution-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
            margin-top: 12px;
            transition: gap var(--transition);
        }
        .solution-card .card-link:hover {
            gap: 12px;
            color: var(--primary-dark);
        }
        @media (max-width: 1024px) {
            .solution-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .solution-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .solution-card {
                padding: 24px 20px 28px;
            }
        }

        /* ===== 数据 / 统计区 ===== */
        .stats-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            transform: scale(1.05);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            z-index: 2;
        }
        .stat-item {
            text-align: center;
            padding: 24px 16px;
        }
        .stat-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.1;
            letter-spacing: -0.02em;
        }
        .stat-item .stat-number .plus {
            color: var(--secondary-light);
        }
        .stat-item .stat-label {
            font-size: 0.92rem;
            color: var(--text-light);
            margin-top: 8px;
            font-weight: 500;
        }
        @media (max-width: 900px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .stat-number {
                font-size: 2rem;
            }
        }

        /* ===== 案例卡片 ===== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .case-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(26, 86, 219, 0.1);
        }
        .case-card .case-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: var(--bg-dark-alt);
        }
        .case-card .case-body {
            padding: 24px 24px 28px;
        }
        .case-card .case-body .badge {
            margin-bottom: 10px;
        }
        .case-card .case-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .case-card .case-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .case-card .case-body .case-link {
            font-weight: 600;
            font-size: 0.88rem;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .case-card .case-body .case-link:hover {
            gap: 12px;
        }
        @media (max-width: 1024px) {
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .case-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .case-card .case-img {
                height: 180px;
            }
        }

        /* ===== 技术优势 ===== */
        .tech-section {
            background: var(--bg-dark-alt);
            position: relative;
        }
        .tech-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
        }
        .tech-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .tech-item {
            display: flex;
            gap: 20px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all var(--transition);
        }
        .tech-item:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(59, 130, 246, 0.15);
            transform: translateY(-2px);
        }
        .tech-item .tech-icon {
            flex: 0 0 48px;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(59, 130, 246, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--secondary-light);
        }
        .tech-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 6px;
        }
        .tech-item p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .tech-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .tech-item {
                padding: 20px 18px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(26, 86, 219, 0.12);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-dark);
            cursor: pointer;
            gap: 16px;
            transition: color var(--transition);
            user-select: none;
        }
        .faq-item .faq-q:hover {
            color: var(--primary);
        }
        .faq-item .faq-q .faq-toggle {
            font-size: 1.1rem;
            color: var(--text-muted);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-q .faq-toggle {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-item .faq-a {
            max-height: 0;
            padding: 0 24px;
            overflow: hidden;
            transition: all 0.35s ease;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            border-top: 0 solid var(--border-light);
        }
        .faq-item.active .faq-a {
            max-height: 400px;
            padding: 16px 24px 24px;
            border-top-width: 1px;
        }
        @media (max-width: 640px) {
            .faq-item .faq-q {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-item.active .faq-a {
                padding: 12px 16px 18px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.12;
            transform: scale(1.05);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 24px;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        @media (max-width: 640px) {
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-section .cta-actions .btn {
                width: 100%;
                max-width: 320px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .logo a {
            color: #fff;
            font-size: 1.25rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.7;
            margin: 16px 0 20px;
            max-width: 360px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-light);
            font-size: 1rem;
            transition: all var(--transition);
            text-decoration: none;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(26, 86, 219, 0.3);
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--text-light);
            padding: 5px 0;
            text-decoration: none;
            transition: all var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0 32px;
            font-size: 0.82rem;
            color: var(--text-light);
            gap: 16px;
            flex-wrap: wrap;
        }
        .footer-bottom a {
            color: var(--text-light);
            text-decoration: underline;
            text-underline-offset: 3px;
            text-decoration-color: rgba(255, 255, 255, 0.1);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
            text-decoration-color: var(--primary-light);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-12 {
            gap: 12px;
        }

        /* ===== focus 可访问性 ===== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* ===== 图片圆角 ===== */
        .img-rounded {
            border-radius: var(--radius-md);
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(26, 86, 219, 0.12);
        }
        .step-item .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 100px;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
            font-size: 1.1rem;
            font-weight: 800;
            margin-bottom: 14px;
            transition: all var(--transition);
        }
        .step-item:hover .step-num {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 18px rgba(26, 86, 219, 0.25);
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-item {
                padding: 20px 14px;
            }
        }

        /* ===== 图文介绍块 ===== */
        .intro-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-block .intro-image img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }
        .intro-block .intro-text h2 {
            font-size: 2rem;
            margin-bottom: 16px;
        }
        .intro-block .intro-text p {
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
            font-size: 1rem;
        }
        .intro-block .intro-text .intro-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 16px;
        }
        .intro-block .intro-text .intro-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--text-dark);
        }
        .intro-block .intro-text .intro-list li i {
            color: var(--primary);
            margin-top: 3px;
            flex-shrink: 0;
        }
        @media (max-width: 900px) {
            .intro-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-block .intro-image {
                order: -1;
            }
            .intro-block .intro-text h2 {
                font-size: 1.5rem;
            }
        }