/* roulang page: index */
:root {
      --deep-space: #0A0E1A;
      --card-bg-start: #0F1729;
      --card-bg-end: #1A1F35;
      --neon-cyan: #00F0FF;
      --electric-purple: #B44DFF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.06);
      --glass-hover-bg: rgba(255, 255, 255, 0.06);
      --glass-hover-border: rgba(0, 240, 255, 0.3);
      --text-primary: #FFFFFF;
      --text-body: #E0E6F0;
      --text-muted: #8A93A8;
      --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 8px 40px rgba(0, 240, 255, 0.15);
      --border-radius-card: 16px;
      --border-radius-btn: 50px;
      --border-radius-input: 12px;
      --border-radius-accordion: 12px;
      --font-mono: 'Courier New', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background: var(--deep-space);
      background-image: radial-gradient(circle at 20% 20%, rgba(0, 240, 255, 0.03) 0%, transparent 40%),
                        radial-gradient(circle at 80% 70%, rgba(180, 77, 255, 0.04) 0%, transparent 50%);
      color: var(--text-body);
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      font-size: 16px;
      line-height: 1.6;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a, button, input, select, textarea {
      outline: none;
    }

    img {
      max-width: 100%;
      height: auto;
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #0A0E1A;
    }
    ::-webkit-scrollbar-thumb {
      background: #2A2F40;
      border-radius: 3px;
    }

    /* 导航 - 悬浮胶囊 */
    .navbar-custom {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1030;
      width: auto;
      max-width: 95%;
      background: rgba(10, 14, 26, 0.75);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 50px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.3s ease;
    }

    .navbar-brand {
      color: white;
      font-weight: 700;
      font-size: 1.3rem;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-right: 20px;
    }

    .navbar-brand i {
      color: var(--neon-cyan);
      font-size: 1.6rem;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-link {
      color: #B0B8CC;
      text-decoration: none;
      padding: 8px 16px;
      border-radius: 50px;
      font-weight: 500;
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
      background: rgba(0, 240, 255, 0.05);
    }

    .btn-nav-cta {
      background: var(--neon-cyan);
      color: #0A0E1A;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 50px;
      text-decoration: none;
      transition: all 0.25s;
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
      border: none;
      margin-left: 8px;
      white-space: nowrap;
    }

    .btn-nav-cta:hover {
      background: #33F5FF;
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
      color: #0A0E1A;
    }

    /* 移动端导航调整 */
    @media (max-width: 768px) {
      .navbar-custom {
        flex-wrap: wrap;
        justify-content: center;
        padding: 10px 16px;
      }
      .nav-menu {
        justify-content: center;
      }
      .nav-link {
        padding: 6px 12px;
        font-size: 0.9rem;
      }
    }

    /* Hero 区域 */
    .hero-section {
      padding: 140px 0 80px;
      position: relative;
      min-height: 80vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #0A0E1A 0%, #12172C 100%);
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      color: white;
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
      line-height: 1.2;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 600px;
      margin-top: 20px;
    }

    .data-badge-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 20px;
      text-align: center;
      transition: 0.3s;
      color: white;
    }

    .data-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--neon-cyan);
      font-family: var(--font-mono);
    }

    .btn-hero {
      background: var(--neon-cyan);
      color: #0A0E1A;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 50px;
      font-size: 1.1rem;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
      transition: 0.3s;
      margin-top: 25px;
      border: none;
    }

    .btn-hero:hover {
      background: #40F5FF;
      box-shadow: 0 0 40px rgba(0,240,255,0.8);
      color: #0A0E1A;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
    }

    /* 通用板块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      color: white;
    }

    .glass-card:hover {
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .service-card {
      padding: 24px;
    }

    .tag-purple {
      background: rgba(180, 77, 255, 0.15);
      color: #B44DFF;
      border-radius: 20px;
      padding: 2px 12px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .progress-custom {
      height: 10px;
      border-radius: 10px;
      background: #2A2F40;
    }

    .progress-bar-cyan {
      background: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0,240,255,0.5);
    }

    .accordion-button {
      background: transparent;
      color: #E0E6F0;
      font-weight: 600;
      border: none;
      box-shadow: none;
    }

    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.05);
      color: var(--neon-cyan);
      box-shadow: none;
    }

    .accordion-item {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .form-control-dark {
      background: #1A1F35;
      border: 1px solid rgba(255,255,255,0.1);
      color: white;
      border-radius: 12px;
      padding: 12px 16px;
    }

    .form-control-dark:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
      background: #1A1F35;
      color: white;
    }

    .btn-glow {
      background: linear-gradient(90deg, #00F0FF, #B44DFF);
      border: none;
      color: white;
      font-weight: 700;
      border-radius: 50px;
      padding: 14px;
      transition: 0.3s;
      box-shadow: 0 4px 20px rgba(0,240,255,0.3);
    }

    .btn-glow:hover {
      background: linear-gradient(90deg, #B44DFF, #00F0FF);
      box-shadow: 0 6px 30px rgba(180,77,255,0.5);
      color: white;
    }

    footer {
      border-top: 2px solid var(--neon-cyan);
    }