/* roulang page: index */
:root {
      --steel-deep: #1A1D24;
      --steel-dark: #0F1117;
      --molten-gold: #C5923C;
      --molten-gold-dark: #8B6914;
      --cool-blue: #4A7C96;
      --silver-dark: #2E3239;
      --oxide-red: #8B3A3A;
      --chrome-white: #E8ECF0;
      --steel-border: #3A4049;
      --gold-glow: rgba(197, 146, 60, 0.2);
      --gold-strong: rgba(197, 146, 60, 0.4);
      --card-blur: blur(12px);
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-data: 'DIN Alternate', 'Arial', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background: radial-gradient(circle at 30% 10%, var(--steel-deep) 0%, var(--steel-dark) 90%);
      color: var(--chrome-white);
      font-family: var(--font-body);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .data-number {
      font-family: var(--font-title);
      letter-spacing: -0.02em;
      font-weight: 600;
    }
    h1 { font-size: 48px; line-height: 1.25; }
    h2 { font-size: 36px; line-height: 1.3; }
    h3 { font-size: 24px; line-height: 1.35; }
    .data-number { font-family: var(--font-data); font-weight: 700; color: var(--molten-gold); }
    .text-cool { color: var(--cool-blue); }
    .text-gold { color: var(--molten-gold); }
    .bg-gold-grad { background: linear-gradient(135deg, var(--molten-gold) 0%, var(--molten-gold-dark) 100%); }
    .section-padding { padding: 100px 0; }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .section-padding { padding: 70px 0; }
    }
    .decorative-line {
      width: 60px;
      height: 2px;
      background: var(--molten-gold);
      margin: 16px 0 24px;
    }
    .card-glass {
      background: rgba(46, 50, 57, 0.7);
      backdrop-filter: var(--card-blur);
      -webkit-backdrop-filter: var(--card-blur);
      border: 1px solid var(--gold-glow);
      border-radius: 16px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(197, 146, 60, 0.15);
      transition: var(--transition-smooth);
    }
    .card-glass:hover {
      transform: translateY(-6px);
      border-color: var(--gold-strong);
      box-shadow: 0 16px 40px rgba(0,0,0,0.7), inset 0 1px 0 rgba(197, 146, 60, 0.25);
    }
    .btn-gold {
      background: linear-gradient(135deg, var(--molten-gold) 0%, #B88631 100%);
      color: #1A1D24;
      font-weight: 600;
      border: none;
      padding: 12px 28px;
      border-radius: 40px;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 14px rgba(197, 146, 60, 0.4);
      transition: var(--transition-smooth);
    }
    .btn-gold:hover {
      background: linear-gradient(135deg, #D6A84D 0%, #C5923C 100%);
      color: #0F1117;
      box-shadow: 0 8px 20px rgba(197, 146, 60, 0.6);
      transform: translateY(-2px);
    }
    .btn-outline-light-custom {
      border: 1px solid var(--chrome-white);
      color: var(--chrome-white);
      background: transparent;
      padding: 12px 28px;
      border-radius: 40px;
      font-weight: 500;
      transition: var(--transition-smooth);
    }
    .btn-outline-light-custom:hover {
      background: rgba(232, 236, 240, 0.1);
      border-color: var(--molten-gold);
      color: var(--molten-gold);
    }
    /* 导航卡片化 */
    .navbar-custom {
      background: rgba(46, 50, 57, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(197, 146, 60, 0.25);
      border-radius: 50px;
      padding: 8px 28px;
      margin: 16px auto 0;
      max-width: 1100px;
      width: 95%;
      box-shadow: 0 12px 28px rgba(0,0,0,0.6);
    }
    .nav-icon-item {
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--chrome-white);
      padding: 8px 16px;
      border-radius: 30px;
      transition: var(--transition-smooth);
      text-decoration: none;
      font-weight: 500;
    }
    .nav-icon-item i { color: var(--cool-blue); transition: var(--transition-smooth); }
    .nav-icon-item:hover { color: var(--molten-gold); background: rgba(197,146,60,0.1); }
    .nav-icon-item:hover i { color: var(--molten-gold); }
    @media (max-width: 992px) {
      .navbar-custom { border-radius: 30px; padding: 8px 20px; }
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex !important; }
    }
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 10px;
      right: 10px;
      background: rgba(30, 33, 40, 0.92);
      backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 10px 16px;
      border: 1px solid var(--gold-glow);
      z-index: 1000;
      justify-content: space-around;
    }
    .mobile-nav-link {
      color: var(--chrome-white);
      text-align: center;
      font-size: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      text-decoration: none;
    }
    .mobile-nav-link i { font-size: 18px; color: var(--cool-blue); }
    .mobile-nav-link.active i { color: var(--molten-gold); }
    /* 粒子背景 */
    #heroCanvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      pointer-events: none;
    }
    .hero-content { position: relative; z-index: 2; }
    /* 数字滚动 */
    .counter { font-size: 42px; font-weight: 700; color: var(--molten-gold); }
    /* 横向滚动案例 */
    .case-scroll {
      display: flex;
      overflow-x: auto;
      gap: 20px;
      padding-bottom: 15px;
      scrollbar-width: thin;
      scrollbar-color: var(--molten-gold) var(--silver-dark);
    }
    .case-scroll::-webkit-scrollbar { height: 4px; }
    .case-scroll::-webkit-scrollbar-thumb { background: var(--molten-gold); border-radius: 4px; }
    .case-card {
      min-width: 300px;
      background: var(--silver-dark);
      border-radius: 16px;
      padding: 20px;
      border-left: 4px solid var(--molten-gold);
      transition: var(--transition-smooth);
    }
    .case-card:hover { background: #3a404c; }
    /* FAQ手风琴 */
    .accordion-faq .accordion-button {
      background: var(--silver-dark);
      color: var(--chrome-white);
      font-weight: 500;
      border-radius: 12px !important;
      box-shadow: none;
      border: 1px solid transparent;
      transition: var(--transition-smooth);
    }
    .accordion-faq .accordion-button:not(.collapsed) {
      background: rgba(197,146,60,0.1);
      color: var(--molten-gold);
      border-color: var(--gold-glow);
      box-shadow: none;
    }
    .accordion-faq .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 12px;
    }
    .footer-link { color: var(--cool-blue); text-decoration: none; transition: var(--transition-smooth); }
    .footer-link:hover { color: var(--molten-gold); }
    .globe-spin { animation: spin 12s linear infinite; display: inline-block; }
    @keyframes spin { 100% { transform: rotate(360deg); } }