/* roulang page: index */
:root {
      --bg-dark: #0B0F17;
      --bg-dark-alt: #111622;
      --bg-surface: #1A2232;
      --bg-light: #F5F7FA;
      --bg-white: #FFFFFF;
      --primary: #0A4D68;
      --accent: #00E599;
      --accent-hover: #00c784;
      --accent-warm: #FF6B35;
      --border-dark: #2A354A;
      --border-light: rgba(0, 0, 0, 0.08);
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #F1F5F9;
      --text-dim: #94A3B8;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "MiSans", "Microsoft YaHei", sans-serif;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.15);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: var(--font-family); background-color: var(--bg-light); color: var(--text-main); line-height: 1.7; -webkit-font-smoothing: antialiased; }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; }
    button, input, textarea, select { font-family: inherit; font-size: inherit; }

    .container { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }
    .section-tag { display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
    .section-tag.dark { color: var(--primary); }
    .section-title { font-size: 2rem; font-weight: 800; line-height: 1.3; color: var(--text-main); margin-bottom: 16px; }
    .section-title.light { color: #FFFFFF; }
    .section-desc { font-size: 1rem; color: var(--text-muted); max-width: 760px; margin-bottom: 40px; }
    .section-desc.light { color: var(--text-dim); }
    .badge { display: inline-flex; align-items: center; padding: 4px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; }
    .badge-accent { background: rgba(0, 229, 153, 0.15); color: var(--accent); border: 1px solid rgba(0, 229, 153, 0.3); }
    .badge-warm { background: rgba(255, 107, 53, 0.15); color: var(--accent-warm); border: 1px solid rgba(255, 107, 53, 0.3); }
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 700; font-size: 0.95rem; cursor: pointer; border: 1px solid transparent; transition: var(--transition); }
    .btn-accent { background: var(--accent); color: var(--bg-dark); }
    .btn-accent:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,229,153,0.3); }
    .btn-outline { background: transparent; border-color: rgba(255,255,255,0.3); color: #fff; }
    .btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,229,153,0.05); }

    /* TopBar & Nav */
    .top-bar { background: #070a10; color: var(--text-dim); font-size: 0.8rem; padding: 6px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
    .top-bar-inner { display: flex; justify-content: space-between; align-items: center; }
    .top-bar-left span { margin-right: 20px; }
    .header-nav { position: sticky; top: 0; z-index: 100; background: #ffffff; border-bottom: 1px solid rgba(0,0,0,0.06); box-shadow: var(--shadow-sm); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
    .brand-logo { font-size: 1.45rem; font-weight: 900; color: var(--bg-dark); display: flex; align-items: center; gap: 8px; letter-spacing: -0.02em; }
    .brand-logo .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); display: inline-block; }
    .nav-menu { display: flex; align-items: center; gap: 28px; }
    .nav-link { font-size: 0.95rem; font-weight: 600; color: var(--text-main); position: relative; padding: 8px 0; }
    .nav-link:hover, .nav-link.active { color: var(--primary); }
    .nav-link.active::after { content: ""; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--primary); }
    .mobile-menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--bg-dark); cursor: pointer; }

    /* Hero */
    .hero-cinematic { position: relative; min-height: 720px; display: flex; align-items: center; background-color: var(--bg-dark); color: #fff; overflow: hidden; }
    .hero-bg { position: absolute; inset: 0; z-index: 1; opacity: 0.42; background-size: cover; background-position: center; filter: contrast(1.15) brightness(0.85); }
    .hero-overlay { position: absolute; inset: 0; z-index: 2; background: linear-gradient(90deg, rgba(11,15,23,0.96) 0%, rgba(11,15,23,0.8) 55%, rgba(11,15,23,0.4) 100%), radial-gradient(circle at 80% 30%, rgba(0,229,153,0.12) 0%, transparent 60%); }
    .hero-content { position: relative; z-index: 3; max-width: 820px; padding: 90px 0; }
    .hero-badge-row { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
    .hero-title { font-size: 3.2rem; font-weight: 900; line-height: 1.2; letter-spacing: -0.03em; margin-bottom: 24px; color: #fff; }
    .hero-title span { color: var(--accent); }
    .hero-intro { font-size: 1.15rem; line-height: 1.8; color: var(--text-dim); margin-bottom: 36px; max-width: 740px; }
    .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
    .hero-status-strip { display: flex; gap: 32px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.1); }
    .status-item h4 { font-size: 1.8rem; font-weight: 800; color: #fff; font-family: monospace; }
    .status-item h4 span { color: var(--accent); font-size: 1rem; }
    .status-item p { font-size: 0.85rem; color: var(--text-dim); }

    /* Sections */
    .section-block { padding: 88px 0; }
    .section-block.dark { background-color: var(--bg-dark-alt); color: #fff; }
    .section-block.black { background-color: var(--bg-dark); color: #fff; }
    .section-block.surface { background-color: #FFFFFF; }

    /* Grid layout */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; align-items: center; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

    /* Cards */
    .card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 28px; transition: var(--transition); position: relative; overflow: hidden; }
    .card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(10, 77, 104, 0.3); }
    .card.dark { background: var(--bg-surface); border: 1px solid var(--border-dark); color: #fff; }
    .card.dark:hover { border-color: var(--accent); box-shadow: 0 10px 30px rgba(0, 229, 153, 0.12); }
    
    .card-img-wrap { border-radius: var(--radius-sm); overflow: hidden; margin-bottom: 20px; background: #000; position: relative; }
    .card-img-wrap img { width: 100%; height: 210px; object-fit: cover; transition: transform 0.4s ease; }
    .card:hover .card-img-wrap img { transform: scale(1.05); }

    .card-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; color: var(--text-main); }
    .card.dark .card-title { color: #fff; }
    .card-text { font-size: 0.95rem; color: var(--text-muted); line-height: 1.65; }
    .card.dark .card-text { color: var(--text-dim); }
    
    /* Metrics Row */
    .metrics-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 36px 40px; margin-top: -50px; position: relative; z-index: 10; box-shadow: var(--shadow-sm); }
    .metric-col { border-right: 1px solid var(--border-light); padding-right: 20px; }
    .metric-col:last-child { border-right: none; }
    .metric-num { font-size: 2.2rem; font-weight: 900; color: var(--primary); line-height: 1.1; margin-bottom: 6px; font-family: monospace; }
    .metric-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

    /* Pipeline / Process */
    .pipeline-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; position: relative; }
    .step-card { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: 24px; position: relative; }
    .step-num { font-size: 0.8rem; font-weight: 800; color: var(--accent-warm); text-transform: uppercase; margin-bottom: 8px; display: block; }
    
    /* Rank List Table */
    .rank-table { width: 100%; border-collapse: collapse; background: var(--bg-surface); border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-dark); }
    .rank-table th, .rank-table td { padding: 18px 24px; text-align: left; border-bottom: 1px solid var(--border-dark); font-size: 0.95rem; }
    .rank-table th { background: rgba(0,0,0,0.25); color: var(--text-dim); font-size: 0.85rem; font-weight: 600; }
    .rank-badge { width: 24px; height: 24px; border-radius: 4px; display: inline-flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; background: var(--border-dark); color: #fff; }
    .rank-badge.top-1 { background: var(--accent); color: var(--bg-dark); }
    .rank-badge.top-2 { background: #60A5FA; color: var(--bg-dark); }
    .rank-badge.top-3 { background: #FBBF24; color: var(--bg-dark); }

    /* Partners Wall */
    .partner-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
    .partner-item { background: #FFFFFF; border: 1px solid var(--border-light); border-radius: var(--radius-sm); padding: 20px; text-align: center; font-weight: 700; color: var(--text-muted); font-size: 0.95rem; display: flex; align-items: center; justify-content: center; min-height: 72px; }

    /* FAQ */
    .faq-list { display: flex; flex-direction: column; gap: 16px; max-width: 900px; margin: 0 auto; }
    .faq-item { border: 1px solid var(--border-light); border-radius: var(--radius-md); background: #FFFFFF; overflow: hidden; }
    .faq-question { padding: 20px 24px; font-weight: 700; font-size: 1.05rem; cursor: pointer; display: flex; justify-content: space-between; align-items: center; background: #FAFBFD; }
    .faq-answer { padding: 20px 24px; color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; border-top: 1px solid var(--border-light); }

    /* Assurance Banner */
    .assurance-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .assurance-box { display: flex; gap: 16px; align-items: flex-start; padding: 20px; border-radius: var(--radius-md); background: rgba(255,255,255,0.04); border: 1px solid var(--border-dark); }
    .assurance-icon { font-size: 1.8rem; line-height: 1; }

    /* CTA Section */
    .trial-strip { background: linear-gradient(135deg, #0A4D68 0%, #072d3d 100%); border-radius: var(--radius-lg); padding: 60px; color: #fff; position: relative; overflow: hidden; border: 1px solid rgba(0,229,153,0.3); }
    .trial-strip::after { content: ""; position: absolute; right: -80px; bottom: -80px; width: 320px; height: 320px; border-radius: 50%; background: radial-gradient(circle, rgba(0,229,153,0.25) 0%, transparent 70%); pointer-events: none; }

    /* Footer */
    .site-footer { background: #06090F; color: var(--text-dim); padding: 70px 0 30px; font-size: 0.9rem; border-top: 1px solid rgba(255,255,255,0.08); }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 50px; }
    .footer-col h5 { font-size: 1rem; color: #fff; font-weight: 700; margin-bottom: 20px; }
    .footer-links li { margin-bottom: 12px; }
    .footer-links a:hover { color: var(--accent); }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; font-size: 0.85rem; }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.6rem; }
      .metrics-bar { grid-template-columns: repeat(2, 1fr); gap: 20px; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .pipeline-grid { grid-template-columns: repeat(2, 1fr); }
      .partner-grid { grid-template-columns: repeat(3, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .nav-menu { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-title { font-size: 2rem; }
      .grid-2, .grid-3, .grid-4, .assurance-grid { grid-template-columns: 1fr; }
      .metrics-bar { grid-template-columns: 1fr; margin-top: 20px; }
      .metric-col { border-right: none; border-bottom: 1px solid var(--border-light); padding-bottom: 16px; }
      .pipeline-grid { grid-template-columns: 1fr; }
      .partner-grid { grid-template-columns: repeat(2, 1fr); }
      .trial-strip { padding: 36px 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .rank-table { font-size: 0.85rem; }
      .rank-table th, .rank-table td { padding: 12px 14px; }
    }