/* roulang page: index */
:root {
      --primary-gold: #C8A96E;
      --gold-dark: #B8944A;
      --bg-obsidian: #0B0E14;
      --card-bg: #1A1D24;
      --text-primary: #F0EFEA;
      --text-secondary: rgba(240, 239, 234, 0.7);
      --text-muted: rgba(240, 239, 234, 0.5);
      --border-gold: rgba(200, 169, 110, 0.25);
      --red-accent: #D44C2F;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.45);
      --shadow-hover: 0 12px 40px rgba(200,169,110,0.18);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition-smooth: 0.3s ease;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', monospace;
      --container-max: 1280px;
      --header-height: 72px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-obsidian);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 背景网格纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(200,169,110,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(200,169,110,0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: -1;
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      align-items: center;
    }
    #header.scrolled {
      background: rgba(26, 29, 36, 0.9);
      backdrop-filter: blur(16px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid var(--border-gold);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--primary-gold);
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: color 0.2s;
      position: relative;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-gold);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary-gold), var(--gold-dark));
      color: #0B0E14;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
    }
    .nav-cta:hover {
      box-shadow: 0 0 18px rgba(200,169,110,0.5);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary-gold);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--header-height));
      background: rgba(11,14,20,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      font-size: 1.8rem;
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--text-primary);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }
    .section-title {
      font-size: 42px;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* Hero */
    #hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(200,169,110,0.18) 0%, transparent 55%), var(--bg-obsidian);
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 800px;
      z-index: 2;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(to right, #F0EFEA, #C8A96E);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-gold), var(--gold-dark));
      color: #0B0E14;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(200,169,110,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-gold);
      color: var(--primary-gold);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.08);
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: rgba(26,29,36,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(200,169,110,0.15);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-gold);
    }
    .icon-gold {
      color: var(--primary-gold);
      font-size: 2.2rem;
      margin-bottom: 20px;
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .stats-row {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-gold);
    }

    #stats {
      background: var(--bg-obsidian);
      border-top: 1px solid var(--border-gold);
      border-bottom: 1px solid var(--border-gold);
    }
    .stats-flex {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 300px 1fr;
      gap: 48px;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-gold);
      padding: 20px 0;
    }
    .accordion-title {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--primary-gold);
    }

    footer {
      background: var(--card-bg);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-3, .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .faq-grid { grid-template-columns: 1fr; }
      .stats-flex { flex-direction: column; gap: 24px; }
    }