/* roulang page: index */
:root {
      --bg-dark: #080d1a;
      --bg-card: rgba(15, 23, 42, 0.72);
      --bg-card-alt: rgba(30, 41, 59, 0.6);
      --primary-cyan: #0ea5e9;
      --secondary-emerald: #10b981;
      --accent-amber: #f59e0b;
      --text-main: #f8fafc;
      --text-sub: #94a3b8;
      --text-muted: #64748b;
      --border-glow: rgba(14, 165, 233, 0.28);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --glow-shadow: 0 10px 30px -10px rgba(14, 165, 233, 0.45);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
    }

    a { color: var(--primary-cyan); text-decoration: none; transition: all 0.3s ease; }
    a:hover, a:focus { color: #38bdf8; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }

    /* Top Bars */
    .top-meta-bar {
      background: rgba(8, 13, 26, 0.95);
      border-bottom: 1px solid var(--border-subtle);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .top-meta-bar a { color: var(--text-sub); }
    .top-meta-bar a:hover { color: var(--primary-cyan); }

    .site-nav-container {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(8, 13, 26, 0.82);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-subtle);
      transition: all 0.3s;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--primary-cyan);
      font-size: 1.4rem;
      filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.6));
    }
    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      gap: 24px;
    }
    .nav-links a {
      color: var(--text-sub);
      font-size: 0.9375rem;
      font-weight: 500;
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--text-main);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 8px var(--primary-cyan);
    }

    /* Buttons */
    .btn-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9375rem;
      background: linear-gradient(135deg, #0284c7, #0ea5e9);
      color: #ffffff !important;
      border: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 4px 18px rgba(14, 165, 233, 0.35);
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 26px rgba(14, 165, 233, 0.55);
      background: linear-gradient(135deg, #0369a1, #38bdf8);
    }
    .btn-emerald {
      background: linear-gradient(135deg, #059669, #10b981);
      box-shadow: 0 4px 18px rgba(16, 185, 129, 0.35);
    }
    .btn-emerald:hover {
      box-shadow: 0 8px 26px rgba(16, 185, 129, 0.55);
      background: linear-gradient(135deg, #047857, #34d399);
    }
    .btn-outline-glass {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9375rem;
      color: var(--text-main) !important;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .btn-outline-glass:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: rgba(255, 255, 255, 0.25);
      transform: translateY(-2px);
    }

    /* Glass Cards */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: all 0.35s ease;
      height: 100%;
      position: relative;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--glow-shadow);
      transform: translateY(-4px);
    }

    /* Section Styling */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background: #0b1329;
      border-top: 1px solid var(--border-subtle);
      border-bottom: 1px solid var(--border-subtle);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px auto;
    }
    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      background: rgba(14, 165, 233, 0.12);
      border: 1px solid rgba(14, 165, 233, 0.3);
      color: var(--primary-cyan);
      margin-bottom: 16px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-sub);
      line-height: 1.8;
    }

    /* Hero Section (Video / Immersive Stage Style) */
    .hero-banner {
      min-height: 88vh;
      display: flex;
      align-items: center;
      padding: 110px 0 80px 0;
      background: linear-gradient(180deg, rgba(8, 13, 26, 0.75) 0%, #080d1a 100%),
                  url('/assets/images/011d939e64b70ab3.webp') center/cover no-repeat;
      position: relative;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-h1 {
      font-size: 3.1rem;
      font-weight: 900;
      letter-spacing: -1px;
      line-height: 1.25;
      margin-bottom: 22px;
      background: linear-gradient(135deg, #ffffff 40%, #bae6fd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-summary {
      font-size: 1.125rem;
      color: var(--text-sub);
      line-height: 1.85;
      margin-bottom: 34px;
      max-width: 800px;
    }
    .hero-video-mockup {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-glow);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(14, 165, 233, 0.25);
    }
    .hero-video-mockup img {
      width: 100%;
      height: 440px;
      object-fit: cover;
    }
    .video-play-btn {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 72px;
      height: 72px;
      background: rgba(14, 165, 233, 0.85);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.6rem;
      box-shadow: 0 0 25px rgba(14, 165, 233, 0.8);
      cursor: pointer;
      transition: all 0.3s;
    }
    .video-play-btn:hover {
      transform: translate(-50%, -50%) scale(1.1);
      background: var(--primary-cyan);
    }

    /* Countdown / Urgency Band */
    .countdown-band {
      background: linear-gradient(90deg, #0c1938 0%, #0f244a 50%, #0c1938 100%);
      border-top: 1px solid var(--border-glow);
      border-bottom: 1px solid var(--border-glow);
      padding: 24px 0;
    }
    .timer-box {
      background: rgba(8, 13, 26, 0.8);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 8px 16px;
      font-family: monospace;
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--accent-amber);
    }

    /* Workflow Pipeline Steps */
    .step-pipeline {
      display: flex;
      position: relative;
      margin-top: 20px;
    }
    .step-node {
      position: relative;
      padding: 28px 24px;
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      transition: all 0.3s;
    }
    .step-node:hover {
      border-color: var(--primary-cyan);
      transform: translateY(-4px);
    }
    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: rgba(14, 165, 233, 0.2);
      color: var(--primary-cyan);
      font-weight: 800;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    /* Tab Switch Cards */
    .role-tab-btn {
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-subtle);
      color: var(--text-sub);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s;
    }
    .role-tab-btn.active {
      background: var(--primary-cyan);
      color: #fff;
      border-color: var(--primary-cyan);
      box-shadow: 0 4px 16px rgba(14, 165, 233, 0.4);
    }
    .role-pane {
      display: none;
    }
    .role-pane.active {
      display: block;
      animation: fadeIn 0.4s ease forwards;
    }

    /* Accordion FAQ */
    .accordion-item-glass {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .accordion-header-glass {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .accordion-header-glass:hover {
      color: var(--primary-cyan);
    }
    .accordion-body-glass {
      padding: 0 24px 20px 24px;
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.75;
      display: none;
    }
    .accordion-item-glass.active .accordion-body-glass {
      display: block;
    }
    .accordion-item-glass.active {
      border-color: var(--border-glow);
    }

    /* Metric Counters */
    .metric-value {
      font-size: 2.75rem;
      font-weight: 800;
      color: #fff;
      line-height: 1;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #38bdf8, #10b981);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* Site Footer */
    .site-footer {
      background: #050811;
      border-top: 1px solid var(--border-subtle);
      padding: 70px 0 30px 0;
      color: var(--text-sub);
      font-size: 0.9rem;
    }
    .footer-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: var(--text-sub);
    }
    .footer-links a:hover {
      color: var(--primary-cyan);
    }
    .footer-bottom {
      margin-top: 50px;
      padding-top: 25px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      text-align: center;
      color: var(--text-muted);
      font-size: 0.8125rem;
    }

    /* Keyframes */
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
      .hero-h1 { font-size: 2.5rem; }
      .section-title { font-size: 2rem; }
    }
    @media screen and (max-width: 768px) {
      .top-meta-bar { display: none; }
      .hero-banner { padding: 90px 0 60px 0; }
      .hero-h1 { font-size: 2rem; }
      .hero-summary { font-size: 1rem; }
      .section-title { font-size: 1.75rem; }
      .hero-video-mockup img { height: 260px; }
      .nav-links { display: none; }
      .glass-card { padding: 22px; }
    }