/* roulang page: index */
:root {
      --primary: #7B2FFF;
      --primary-glow: #8B5CF6;
      --secondary-gold: #F5A623;
      --accent-cyan: #00F0FF;
      --bg-deep: #0B0E14;
      --bg-card: rgba(20, 15, 40, 0.6);
      --border-light: rgba(255, 255, 255, 0.08);
      --text-white: #ffffff;
      --text-gray: rgba(255, 255, 255, 0.75);
      --text-dim: rgba(255, 255, 255, 0.5);
      --radius-card: 16px;
      --radius-btn: 40px;
      --shadow-card: 0 8px 32px rgba(123, 47, 255, 0.25);
      --shadow-glow: 0 0 20px rgba(123, 47, 255, 0.6);
      --font-zh: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-en: 'Inter', 'Rajdhani', sans-serif;
    }

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

    body {
      font-family: var(--font-zh);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 14, 20, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: background 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--text-white);
      text-shadow: 0 0 12px rgba(123, 47, 255, 0.7);
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px var(--primary-glow));
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-gray);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--text-white);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary-glow);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, #7B2FFF, #5a1fcf);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(123, 47, 255, 0.4);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(123, 47, 255, 0.8);
      transform: translateY(-1px);
      filter: brightness(1.1);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 11px 27px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: rgba(123, 47, 255, 0.15);
      border-color: var(--primary-glow);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 30% 40%, rgba(123, 47, 255, 0.2) 0%, #0B0E14 70%);
      position: relative;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, #c084fc, #F5A623);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 18px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-gray);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background: rgba(20, 15, 40, 0.5);
      backdrop-filter: blur(16px);
      border-radius: 24px;
      padding: 20px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
    }
    .live-data {
      font-family: var(--font-en);
      display: flex;
      justify-content: space-around;
      gap: 20px;
    }
    .stat-digit {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-cyan);
      text-shadow: 0 0 12px #00F0FF;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      text-shadow: 0 0 10px rgba(123, 47, 255, 0.4);
    }
    .section-desc {
      text-align: center;
      color: var(--text-gray);
      max-width: 680px;
      margin: 0 auto 48px;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 14px 40px rgba(123, 47, 255, 0.4);
    }
    .card-icon {
      font-size: 2.4rem;
      margin-bottom: 16px;
      color: var(--accent-cyan);
    }
    .card-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 优势区块 */
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .big-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 56px;
      font-weight: 700;
      color: var(--secondary-gold);
      text-shadow: 0 0 14px #F5A623;
    }

    /* 案例滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) #1a1a2e;
    }
    .case-card {
      min-width: 260px;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: transform 0.2s;
    }
    .case-card:hover {
      transform: scale(1.02);
    }
    .badge-gold {
      background: #F5A623;
      color: #0B0E14;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    /* 套餐 */
    .plan-highlight {
      border: 2px solid var(--primary);
      position: relative;
    }
    .popular-tag {
      position: absolute;
      top: -14px;
      right: 20px;
      background: var(--primary);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-q {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
    }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-gray);
      margin-top: 0;
    }
    .faq-item.active .faq-a {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #1a1035, #0B0E14);
      text-align: center;
      padding: 100px 0;
    }
    .input-group {
      display: flex;
      max-width: 480px;
      margin: 24px auto 0;
    }
    .input-field {
      flex:1;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 40px 0 0 40px;
      padding: 14px 20px;
      color: white;
      outline: none;
    }
    .input-field:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px var(--primary-glow);
    }

    footer {
      background: #070A10;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .adv-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-title { font-size: 36px; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 70px 0; }
    }