/* roulang page: index */
:root {
  --primary: #1a56db;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary: #f97316;
  --secondary-light: #fb923c;
  --accent: #10b981;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.14);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.18);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-w: 1200px;
  --header-h: 72px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul { list-style: none; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: var(--text-white); }
.section-title { font-size: 2rem; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.02em; line-height: 1.2; }
.section-sub { font-size: 1rem; color: var(--text-light); max-width: 640px; margin: 0 auto 48px auto; text-align: center; }
.section-dark .section-sub { color: rgba(255,255,255,0.7); }
.text-center { text-align: center; }

/* ===== HEADER / NAV ===== */
.header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.96); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); box-shadow: 0 1px 4px rgba(0,0,0,0.04); height: var(--header-h); display: flex; align-items: center; }
.header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { font-size: 1.35rem; font-weight: 800; color: var(--primary); letter-spacing: -0.03em; display: flex; align-items: center; gap: 8px; }
.logo i { color: var(--secondary); font-size: 1.5rem; }
.logo:hover { color: var(--primary-dark); }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { padding: 8px 16px; border-radius: var(--radius-sm); font-weight: 500; color: var(--text); font-size: 0.9rem; transition: var(--transition); position: relative; }
.nav a:hover { background: rgba(26,86,219,0.08); color: var(--primary); }
.nav a.active { background: var(--primary); color: #fff; }
.nav a.active:hover { background: var(--primary-dark); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.search-btn { background: none; border: none; font-size: 1.1rem; color: var(--text-light); cursor: pointer; padding: 8px 10px; border-radius: 50%; transition: var(--transition); }
.search-btn:hover { background: rgba(0,0,0,0.05); color: var(--primary); }
.mobile-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text); cursor: pointer; padding: 8px; border-radius: var(--radius-sm); }
.mobile-toggle:hover { background: rgba(0,0,0,0.05); }

/* ===== HERO ===== */
.hero { min-height: 86vh; display: flex; align-items: center; justify-content: center; text-align: center; position: relative; background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat; color: #fff; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(26,86,219,0.6) 50%, rgba(249,115,22,0.3) 100%); z-index: 1; }
.hero .container { position: relative; z-index: 2; padding: 40px 20px; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(255,255,255,0.15); backdrop-filter: blur(6px); border: 1px solid rgba(255,255,255,0.2); padding: 6px 18px; border-radius: 50px; font-size: 0.8rem; font-weight: 500; margin-bottom: 24px; letter-spacing: 0.3px; color: rgba(255,255,255,0.9); }
.hero-badge i { color: var(--secondary-light); }
.hero h1 { font-size: 3.2rem; font-weight: 900; line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.03em; text-shadow: 0 2px 20px rgba(0,0,0,0.3); }
.hero h1 span { background: linear-gradient(135deg, #fb923c, #f97316); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.2rem; max-width: 600px; margin: 0 auto 36px auto; opacity: 0.9; line-height: 1.7; text-shadow: 0 1px 10px rgba(0,0,0,0.2); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px; border-radius: 50px; font-weight: 700; font-size: 1rem; border: none; cursor: pointer; transition: var(--transition); text-decoration: none; }
.btn-primary { background: var(--secondary); color: #fff; box-shadow: 0 4px 20px rgba(249,115,22,0.4); }
.btn-primary:hover { background: #ea580c; transform: translateY(-3px); box-shadow: 0 8px 30px rgba(249,115,22,0.5); color: #fff; }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.6); }
.btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; transform: translateY(-3px); color: #fff; }
.btn-ghost { background: rgba(255,255,255,0.1); color: #fff; border: 1px solid rgba(255,255,255,0.15); }
.btn-ghost:hover { background: rgba(255,255,255,0.2); transform: translateY(-2px); color: #fff; }
.hero-stats { display: flex; flex-wrap: wrap; justify-content: center; gap: 40px; margin-top: 48px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.15); }
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 2rem; font-weight: 800; line-height: 1; }
.hero-stat-label { font-size: 0.8rem; opacity: 0.7; margin-top: 6px; }

/* ===== CARDS / GRID ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card { background: var(--bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 32px 28px; transition: var(--transition); border: 1px solid var(--border); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.card-icon { width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 18px; color: #fff; }
.card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--text-light); font-size: 0.92rem; line-height: 1.6; }
.card-tag { display: inline-block; background: rgba(26,86,219,0.08); color: var(--primary); font-size: 0.75rem; font-weight: 600; padding: 3px 12px; border-radius: 50px; margin-bottom: 12px; }

/* ===== FEATURES ===== */
.feature-card .card-icon { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
.feature-card:nth-child(2) .card-icon { background: linear-gradient(135deg, var(--secondary-light), var(--secondary)); }
.feature-card:nth-child(3) .card-icon { background: linear-gradient(135deg, var(--accent), #059669); }
.feature-card:nth-child(4) .card-icon { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }

/* ===== STEPS ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step-item { text-align: center; padding: 32px 20px; background: var(--bg); border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); position: relative; }
.step-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; font-weight: 800; margin: 0 auto 16px auto; position: relative; z-index: 1; }
.step-item h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.step-item p { font-size: 0.88rem; color: var(--text-light); line-height: 1.5; }

/* ===== POSTS LIST ===== */
.posts-list { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.post-card { display: flex; gap: 20px; background: var(--bg); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); transition: var(--transition); }
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.post-card-img { width: 140px; min-height: 100px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--bg-alt); }
.post-card-body { flex: 1; }
.post-card-cat { font-size: 0.72rem; font-weight: 600; color: var(--secondary); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; display: block; }
.post-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; line-height: 1.4; }
.post-card h3 a { color: var(--text); }
.post-card h3 a:hover { color: var(--primary); }
.post-card p { font-size: 0.85rem; color: var(--text-light); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card-meta { display: flex; align-items: center; gap: 16px; margin-top: 8px; font-size: 0.78rem; color: var(--text-light); }
.post-card-meta i { margin-right: 4px; }
.empty-msg { grid-column: 1 / -1; text-align: center; padding: 40px; color: var(--text-light); font-size: 0.95rem; background: var(--bg); border-radius: var(--radius); border: 1px dashed var(--border); }

/* ===== STATS BLOCK ===== */
.stats-block { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 36px 20px; background: rgba(255,255,255,0.06); border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.08); transition: var(--transition); }
.stat-item:hover { background: rgba(255,255,255,0.1); transform: translateY(-4px); }
.stat-num { font-size: 2.6rem; font-weight: 900; line-height: 1; margin-bottom: 6px; background: linear-gradient(135deg, #fff, rgba(255,255,255,0.7)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { font-size: 0.85rem; opacity: 0.7; }
.stat-item .stat-icon { font-size: 2rem; margin-bottom: 12px; opacity: 0.6; }

/* ===== FAQ ===== */
.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: var(--transition); }
.faq-item:hover { border-color: var(--primary-light); }
.faq-q { padding: 18px 24px; display: flex; align-items: center; justify-content: space-between; cursor: pointer; font-weight: 600; font-size: 0.95rem; gap: 12px; user-select: none; }
.faq-q i { color: var(--text-light); transition: var(--transition); font-size: 0.8rem; }
.faq-item.active .faq-q i { transform: rotate(180deg); color: var(--primary); }
.faq-a { padding: 0 24px 18px 24px; font-size: 0.9rem; color: var(--text-light); line-height: 1.7; display: none; }
.faq-item.active .faq-a { display: block; }

/* ===== CTA ===== */
.cta-block { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); border-radius: var(--radius-lg); padding: 60px 40px; text-align: center; color: #fff; position: relative; overflow: hidden; }
.cta-block::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; opacity: 0.08; }
.cta-block .container { position: relative; z-index: 1; }
.cta-block h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.cta-block p { font-size: 1rem; opacity: 0.85; max-width: 560px; margin: 0 auto 28px auto; }
.cta-block .btn-primary { background: #fff; color: var(--primary); box-shadow: 0 4px 20px rgba(0,0,0,0.15); }
.cta-block .btn-primary:hover { background: var(--secondary); color: #fff; transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.25); }

/* ===== ADVANTAGES ===== */
.adv-list { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.adv-item { display: flex; gap: 16px; align-items: flex-start; padding: 20px; background: var(--bg); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.adv-item:hover { box-shadow: var(--shadow); border-color: transparent; }
.adv-icon { width: 44px; height: 44px; border-radius: 12px; background: rgba(26,86,219,0.1); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.adv-item h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.adv-item p { font-size: 0.85rem; color: var(--text-light); line-height: 1.5; }

/* ===== FOOTER ===== */
.footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 48px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; font-size: 1.2rem; }
.footer-brand p { font-size: 0.85rem; line-height: 1.7; max-width: 300px; }
.footer h4 { color: #fff; font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: rgba(255,255,255,0.6); font-size: 0.85rem; transition: var(--transition); }
.footer ul a:hover { color: var(--secondary-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 20px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; font-size: 0.8rem; }
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--secondary-light); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .stats-block { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.6rem; }
}
@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px 20px; gap: 4px; box-shadow: var(--shadow); }
  .nav.open { display: flex; }
  .nav a { width: 100%; padding: 12px 16px; }
  .mobile-toggle { display: block; }
  .header-actions .search-btn { display: none; }
  .hero { min-height: 70vh; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 1.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .posts-list { grid-template-columns: 1fr; }
  .post-card { flex-direction: column; }
  .post-card-img { width: 100%; height: 160px; }
  .steps { grid-template-columns: 1fr; }
  .stats-block { grid-template-columns: 1fr 1fr; }
  .adv-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .cta-block { padding: 40px 24px; }
  .cta-block h2 { font-size: 1.5rem; }
  .faq-q { padding: 14px 18px; font-size: 0.9rem; }
  .faq-a { padding: 0 18px 14px 18px; }
  .hero-actions .btn { padding: 12px 24px; font-size: 0.9rem; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.9rem; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stats-block { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .section-title { font-size: 1.3rem; }
  .card { padding: 24px 20px; }
}

/* roulang page: article */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;
  --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 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
  --shadow-hover: 0 16px 48px rgba(37,99,235,0.15);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font: 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --max-width: 1200px;
  --header-h: 72px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition: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}
input,button,textarea{font-family:inherit;font-size:inherit;outline:none;border:none}
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
@media(max-width:768px){.container{padding:0 16px}}

/* Header & Nav */
.header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,0.96);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);height:var(--header-h);
  transition:var(--transition)
}
.header .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{font-size:1.4rem;font-weight:700;color:var(--primary);display:flex;align-items:center;gap:10px;letter-spacing:-0.3px}
.logo i{font-size:1.6rem;color:var(--accent)}
.logo:hover{color:var(--primary-dark)}
.nav{display:flex;align-items:center;gap:8px}
.nav a{
  display:flex;align-items:center;gap:8px;padding:8px 20px;border-radius:var(--radius-sm);
  font-size:0.95rem;font-weight:500;color:var(--text-light);transition:var(--transition);
  position:relative
}
.nav a:hover,.nav a.active{color:var(--primary);background:var(--primary-bg)}
.nav a.active{font-weight:600;color:var(--primary-dark);background:var(--primary-bg)}
.nav a i{font-size:1rem}
.nav-toggle{display:none;background:none;font-size:1.5rem;color:var(--text);cursor:pointer;padding:8px;border-radius:var(--radius-sm)}
.nav-toggle:hover{background:var(--bg-alt)}

@media(max-width:768px){
  .nav-toggle{display:flex;align-items:center;justify-content:center}
  .nav{position:fixed;top:var(--header-h);left:0;right:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(16px);
    flex-direction:column;padding:16px 24px;gap:4px;border-bottom:1px solid var(--border);
    transform:translateY(-120%);opacity:0;pointer-events:none;transition:var(--transition);box-shadow:var(--shadow-lg)}
  .nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav a{width:100%;padding:12px 16px;font-size:1rem;border-radius:var(--radius-sm)}
  .nav a i{width:24px}
}

/* Hero Banner */
.article-hero{
  margin-top:var(--header-h);padding:60px 0 40px;
  background:linear-gradient(135deg, var(--primary-bg) 0%, #f0f7ff 100%);
  position:relative;overflow:hidden
}
.article-hero::before{
  content:'';position:absolute;top:-40%;right:-10%;width:400px;height:400px;
  background:radial-gradient(circle,rgba(37,99,235,0.08) 0%,transparent 70%);
  border-radius:50%
}
.article-hero .container{position:relative;z-index:1}
.article-breadcrumb{display:flex;align-items:center;gap:10px;font-size:0.9rem;color:var(--text-light);margin-bottom:20px;flex-wrap:wrap}
.article-breadcrumb a{color:var(--text-light)}
.article-breadcrumb a:hover{color:var(--primary)}
.article-breadcrumb .sep{color:var(--border)}
.article-category{
  display:inline-flex;align-items:center;gap:6px;padding:4px 16px;border-radius:20px;
  background:var(--primary);color:#fff;font-size:0.85rem;font-weight:500;margin-bottom:16px
}
.article-hero h1{font-size:2.4rem;font-weight:700;line-height:1.3;color:var(--text);margin-bottom:16px;letter-spacing:-0.5px}
.article-meta{display:flex;align-items:center;gap:24px;color:var(--text-light);font-size:0.95rem;flex-wrap:wrap}
.article-meta i{margin-right:6px;color:var(--primary-light)}
.article-meta span{display:flex;align-items:center}

@media(max-width:768px){
  .article-hero{padding:40px 0 28px}
  .article-hero h1{font-size:1.6rem}
  .article-meta{gap:16px;font-size:0.85rem}
}

/* Main Content */
.article-main{padding:48px 0 64px;background:var(--bg)}
.article-layout{display:grid;grid-template-columns:1fr 320px;gap:48px}
.article-body{min-width:0}
.article-body .content{
  font-size:1.05rem;line-height:1.9;color:var(--text);background:var(--bg);
  padding:40px;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)
}
.article-body .content p{margin-bottom:1.2em}
.article-body .content h2{font-size:1.6rem;font-weight:700;margin:1.6em 0 0.8em;color:var(--text);letter-spacing:-0.3px}
.article-body .content h3{font-size:1.25rem;font-weight:600;margin:1.4em 0 0.6em;color:var(--text)}
.article-body .content ul,.article-body .content ol{padding-left:1.6em;margin-bottom:1.2em}
.article-body .content li{margin-bottom:0.4em;list-style:disc}
.article-body .content ol li{list-style:decimal}
.article-body .content a{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.article-body .content a:hover{color:var(--primary-dark);text-decoration-thickness:2px}
.article-body .content blockquote{
  border-left:4px solid var(--primary);background:var(--primary-bg);padding:16px 24px;
  margin:1.2em 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-light);font-style:italic
}
.article-body .content img{margin:1.2em 0;border-radius:var(--radius-sm);box-shadow:var(--shadow)}
.article-body .content .highlight{padding:2px 8px;background:var(--accent);color:#fff;border-radius:4px;font-weight:500}

.article-notfound{
  text-align:center;padding:80px 40px;background:var(--bg-alt);border-radius:var(--radius);
  border:1px solid var(--border)
}
.article-notfound i{font-size:3rem;color:var(--text-light);margin-bottom:16px;display:block}
.article-notfound h2{font-size:1.5rem;margin-bottom:12px;color:var(--text)}
.article-notfound p{color:var(--text-light);margin-bottom:24px}
.article-notfound .btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius-sm);
  background:var(--primary);color:#fff;font-weight:600;transition:var(--transition)}
.article-notfound .btn:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}

/* Sidebar */
.article-sidebar{position:sticky;top:calc(var(--header-h) + 24px);align-self:start}
.sidebar-block{background:var(--bg-alt);border-radius:var(--radius);padding:28px;border:1px solid var(--border);margin-bottom:24px}
.sidebar-block h3{font-size:1.1rem;font-weight:700;margin-bottom:16px;color:var(--text);display:flex;align-items:center;gap:8px}
.sidebar-block h3 i{color:var(--primary)}
.sidebar-list li{border-bottom:1px solid var(--border);padding:12px 0}
.sidebar-list li:last-child{border-bottom:none}
.sidebar-list a{display:flex;flex-direction:column;gap:4px;color:var(--text)}
.sidebar-list a:hover{color:var(--primary)}
.sidebar-list .s-title{font-weight:500;font-size:0.95rem;line-height:1.4}
.sidebar-list .s-date{font-size:0.8rem;color:var(--text-light)}
.sidebar-tags{display:flex;flex-wrap:wrap;gap:8px}
.sidebar-tags a{padding:4px 14px;border-radius:20px;background:var(--bg);border:1px solid var(--border);
  font-size:0.85rem;color:var(--text-light);transition:var(--transition)}
.sidebar-tags a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.sidebar-cta{text-align:center;padding:32px 20px}
.sidebar-cta h4{font-size:1.2rem;margin-bottom:8px;color:var(--text)}
.sidebar-cta p{font-size:0.9rem;color:var(--text-light);margin-bottom:20px}
.sidebar-cta .btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius-sm);
  background:var(--accent);color:#fff;font-weight:600;transition:var(--transition)}
.sidebar-cta .btn:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:var(--shadow-lg)}

@media(max-width:1024px){
  .article-layout{grid-template-columns:1fr;gap:32px}
  .article-sidebar{position:static}
  .article-body .content{padding:24px}
}

@media(max-width:520px){
  .article-main{padding:32px 0 48px}
  .article-body .content{padding:16px;font-size:0.98rem;line-height:1.8}
  .article-body .content h2{font-size:1.3rem}
  .article-hero h1{font-size:1.35rem}
  .sidebar-block{padding:20px}
}

/* Related Posts */
.related-section{background:var(--bg-alt);padding:56px 0;border-top:1px solid var(--border)}
.related-section .section-title{text-align:center;font-size:1.8rem;font-weight:700;margin-bottom:8px;color:var(--text)}
.related-section .section-sub{text-align:center;color:var(--text-light);margin-bottom:40px;font-size:1.05rem}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.related-card{
  background:var(--bg);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);
  box-shadow:var(--shadow);transition:var(--transition);display:flex;flex-direction:column
}
.related-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:var(--primary-light)}
.related-card .card-img{height:180px;background:var(--border);overflow:hidden}
.related-card .card-img img{width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.related-card:hover .card-img img{transform:scale(1.06)}
.related-card .card-body{padding:20px;flex:1;display:flex;flex-direction:column}
.related-card .card-cat{font-size:0.8rem;color:var(--primary);font-weight:500;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.related-card .card-title{font-size:1rem;font-weight:600;line-height:1.4;color:var(--text);margin-bottom:8px;flex:1}
.related-card .card-title a{color:var(--text);transition:var(--transition)}
.related-card .card-title a:hover{color:var(--primary)}
.related-card .card-date{font-size:0.8rem;color:var(--text-light)}
@media(max-width:768px){.related-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.related-grid{grid-template-columns:1fr}}

/* Footer */
.footer{background:var(--bg-dark);color:var(--text-white);padding:56px 0 0}
.footer .container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.08)}
.footer-brand .logo{color:#fff;font-size:1.3rem;margin-bottom:16px}
.footer-brand .logo i{color:var(--accent)}
.footer-brand p{font-size:0.9rem;line-height:1.7;color:rgba(255,255,255,0.6);max-width:360px}
.footer h4{font-size:1rem;font-weight:600;color:#fff;margin-bottom:16px;position:relative;padding-bottom:8px}
.footer h4::after{content:'';position:absolute;bottom:0;left:0;width:32px;height:2px;background:var(--primary)}
.footer ul li{margin-bottom:10px}
.footer ul li a{color:rgba(255,255,255,0.6);font-size:0.9rem;transition:var(--transition);display:flex;align-items:center;gap:6px}
.footer ul li a:hover{color:#fff;padding-left:4px}
.footer ul li i{color:var(--primary-light);width:18px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:20px 0;font-size:0.85rem;color:rgba(255,255,255,0.5);flex-wrap:wrap;gap:12px}
.footer-bottom a{color:rgba(255,255,255,0.5);transition:var(--transition)}
.footer-bottom a:hover{color:#fff}
@media(max-width:768px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:520px){
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;text-align:center}
}

/* CTA Section */
.cta-section{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);padding:48px 0;text-align:center}
.cta-section .container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.cta-section h2{font-size:1.8rem;font-weight:700;color:#fff;margin-bottom:12px}
.cta-section p{font-size:1.1rem;color:rgba(255,255,255,0.85);margin-bottom:28px;max-width:600px;margin-left:auto;margin-right:auto}
.cta-section .btn-cta{display:inline-flex;align-items:center;gap:10px;padding:14px 36px;border-radius:var(--radius-sm);
  background:#fff;color:var(--primary);font-weight:600;font-size:1.05rem;transition:var(--transition);box-shadow:0 8px 30px rgba(0,0,0,0.15)}
.cta-section .btn-cta:hover{transform:translateY(-3px);box-shadow:0 16px 48px rgba(0,0,0,0.25);background:var(--bg-alt)}
@media(max-width:768px){.cta-section h2{font-size:1.4rem}}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #e8effd;
            --primary-gradient: linear-gradient(135deg, #1a56db 0%, #7c3aed 100%);
            --secondary: #f59e0b;
            --secondary-light: #fef3c7;
            --accent: #10b981;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-height: 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-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        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(2rem, 5vw, 3.2rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3.5vw, 2.2rem);
            margin-bottom: 0.5rem;
        }
        h3 {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-header p {
            max-width: 640px;
            margin: 0 auto;
            font-size: 1.1rem;
            color: var(--text-secondary);
        }
        .section-header .subtitle {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 4px 18px;
            border-radius: 50px;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.3px;
        }
        .logo i {
            font-size: 1.5rem;
            color: var(--primary);
        }
        .logo:hover {
            color: var(--primary-dark);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav a.active {
            color: var(--text-white);
            background: var(--primary-gradient);
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
        }
        .nav a.active:hover {
            box-shadow: 0 6px 24px rgba(26, 86, 219, 0.45);
            transform: translateY(-1px);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-section-alt);
        }

        /* ===== Hero Banner (内页) ===== */
        .page-hero {
            background: var(--primary-gradient);
            padding: 80px 0 60px;
            position: relative;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .page-hero h1 {
            color: var(--text-white);
            font-size: clamp(2rem, 4.5vw, 3rem);
            margin-bottom: 16px;
            max-width: 800px;
        }
        .page-hero p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.15rem;
            max-width: 640px;
            margin-bottom: 0;
            line-height: 1.8;
        }
        .page-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            margin-bottom: 24px;
        }
        .page-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }
        .page-hero .breadcrumb a:hover {
            color: #fff;
        }
        .page-hero .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }

        /* ===== 指南内容区 ===== */
        .guide-section {
            background: var(--bg-white);
        }
        .guide-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .guide-grid.reverse {
            direction: rtl;
        }
        .guide-grid.reverse>* {
            direction: ltr;
        }
        .guide-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            transition: var(--transition);
        }
        .guide-image:hover {
            transform: scale(1.01);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
        }
        .guide-image img {
            width: 100%;
            height: 380px;
            object-fit: cover;
        }
        .guide-content h3 {
            font-size: 1.6rem;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .guide-content p {
            margin-bottom: 16px;
            color: var(--text-secondary);
            font-size: 1.05rem;
        }
        .guide-content .step-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 20px;
        }
        .guide-content .step-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            background: var(--bg-section-alt);
            padding: 14px 18px;
            border-radius: var(--radius-sm);
            border-left: 4px solid var(--primary);
            transition: var(--transition);
        }
        .guide-content .step-item:hover {
            background: var(--primary-light);
            transform: translateX(4px);
        }
        .guide-content .step-num {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .guide-content .step-item p {
            margin-bottom: 0;
            font-size: 0.95rem;
        }

        /* ===== 功能卡片区 ===== */
        .features-alt {
            background: var(--bg-section-alt);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin: 0 auto 18px;
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== 使用流程 ===== */
        .flow-section {
            background: var(--bg-white);
        }
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .flow-steps::after {
            content: '';
            position: absolute;
            top: 48px;
            left: 10%;
            right: 10%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
            z-index: 0;
            border-radius: 4px;
        }
        .flow-step {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 20px 24px;
            text-align: center;
            position: relative;
            z-index: 1;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .flow-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .flow-step .step-badge {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3);
        }
        .flow-step h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }
        .flow-step p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== 注意事项 ===== */
        .notes-section {
            background: var(--bg-section-alt);
        }
        .notes-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .note-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            box-shadow: var(--shadow-sm);
            border-left: 5px solid var(--secondary);
            transition: var(--transition);
        }
        .note-card.warning {
            border-left-color: #ef4444;
        }
        .note-card.success {
            border-left-color: var(--accent);
        }
        .note-card.info {
            border-left-color: var(--primary);
        }
        .note-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .note-card h4 {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .note-card h4 i {
            font-size: 1.2rem;
            color: var(--secondary);
        }
        .note-card.warning h4 i {
            color: #ef4444;
        }
        .note-card.success h4 i {
            color: var(--accent);
        }
        .note-card.info h4 i {
            color: var(--primary);
        }
        .note-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-white);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-question {
            background: var(--bg-white);
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: var(--transition);
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-question i {
            transition: var(--transition);
            color: var(--primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            background: var(--bg-section-alt);
        }
        .faq-answer.open {
            padding: 18px 24px;
            max-height: 300px;
        }
        .faq-answer p {
            margin-bottom: 0;
            color: var(--text-secondary);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--text-white);
            color: var(--primary);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }
        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 32px;
        }
        .footer .logo {
            color: #fff;
            margin-bottom: 12px;
        }
        .footer .logo i {
            color: var(--secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.95rem;
            max-width: 320px;
            margin-top: 8px;
        }
        .footer h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer ul li {
            margin-bottom: 10px;
        }
        .footer ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            transition: var(--transition);
        }
        .footer ul li a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }
        .footer ul li i {
            color: var(--secondary);
            width: 18px;
        }
        .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: 0.9rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .flow-steps::after {
                display: none;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .nav {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                gap: 6px;
            }
            .nav.open {
                display: flex;
            }
            .nav a {
                padding: 12px 18px;
                border-radius: var(--radius-sm);
                width: 100%;
                font-size: 1rem;
            }
            .nav-toggle {
                display: block;
            }
            .page-hero {
                padding: 60px 0 40px;
                min-height: 240px;
            }
            section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .guide-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .guide-grid.reverse {
                direction: ltr;
            }
            .guide-image img {
                height: 240px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .flow-steps {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .notes-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 320px;
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-hero h1 {
                font-size: 1.6rem;
            }
            .page-hero p {
                font-size: 0.95rem;
            }
            .flow-steps {
                grid-template-columns: 1fr;
            }
            .guide-content h3 {
                font-size: 1.3rem;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 14px 16px;
            }
            .faq-answer.open {
                padding: 14px 16px;
            }
            .note-card {
                padding: 18px 20px;
            }
            .logo {
                font-size: 1.15rem;
            }
            .logo i {
                font-size: 1.2rem;
            }
        }

        /* ===== 滚动动画辅助 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }