/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --bg-light: #F0F2F5;
      --card-white: #FFFFFF;
      --dark-block: #060B1A;
      --text-main: #1A1A2E;
      --text-muted: #5A5A72;
      --text-on-dark: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.10);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: 0.25s ease;
      --container-max: 1280px;
      --grid-gap: 24px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
    }

    .site-header.scrolled {
      background: rgba(10, 14, 39, 0.96);
      border-bottom: 1px solid rgba(0, 240, 255, 0.25);
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: #fff;
    }
    .logo span {
      background: linear-gradient(120deg, var(--accent-cyan), var(--accent-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      transition: color 0.2s;
      font-size: 1rem;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }

    .btn-nav {
      background: var(--accent-cyan);
      color: #0A0E27 !important;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      transition: all 0.25s;
      margin-left: 8px;
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    .btn-nav:hover {
      background: #00d4e0;
      box-shadow: 0 0 22px rgba(0,240,255,0.7);
    }

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(16px);
      border-top: 1px solid rgba(0,240,255,0.3);
      padding: 10px 8px;
      justify-content: space-around;
      z-index: 1001;
    }

    .mobile-nav a {
      color: rgba(255,255,255,0.8);
      font-size: 0.8rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .mobile-cta {
      background: var(--accent-cyan);
      color: #0A0E27 !important;
      border-radius: 30px;
      padding: 8px 20px;
      font-weight: 700;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .header-inner {
        height: 64px;
      }
    }

    /* Hero */
    .hero {
      background-color: var(--primary-deep);
      background-image: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 35%);
      padding: 140px 0 100px;
      color: #fff;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-title span {
      background: linear-gradient(120deg, var(--accent-cyan), var(--accent-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: #0A0E27;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 700;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 14px rgba(0,240,255,0.5);
    }
    .btn-primary:hover {
      background: #00d9e6;
      box-shadow: 0 0 24px rgba(0,240,255,0.8);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      transition: 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    .data-panel {
      background: rgba(6,11,26,0.7);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 32px;
      display: flex;
      justify-content: space-around;
      border: 1px solid rgba(0,240,255,0.15);
    }
    .metric {
      text-align: center;
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
      font-family: 'SF Mono', 'Menlo', monospace;
    }
    .metric-label {
      color: rgba(255,255,255,0.7);
      font-size: 0.9rem;
    }
    .badge-up {
      color: var(--accent-pink);
      font-weight: 600;
      font-size: 0.85rem;
    }

    @media (max-width: 900px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-dark {
      background: var(--dark-block);
      color: #fff;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
    }

    /* 优势卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,240,255,0.3);
    }
    .card-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .card h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
    }
    .badge-capsule {
      display: inline-block;
      background: rgba(0,240,255,0.08);
      border: 1px solid var(--accent-cyan);
      border-radius: 30px;
      padding: 6px 18px;
      font-weight: 600;
      color: var(--accent-cyan);
      margin-top: 12px;
    }

    @media (max-width: 1024px) {
      .cards-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 640px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比卡片 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }
    .compare-card {
      background: rgba(255,255,255,0.05);
      border-radius: 18px;
      padding: 32px;
      backdrop-filter: blur(4px);
    }
    .vs-badge {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-pink);
    }
    .highlight {
      color: var(--accent-cyan);
    }
    @media (max-width: 768px) {
      .compare-row {
        grid-template-columns: 1fr;
      }
      .vs-badge {
        text-align: center;
      }
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(120deg, var(--accent-cyan), var(--accent-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* 主播卡片 */
    .streamer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
    }
    .streamer-card {
      background: #fff;
      border-radius: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .streamer-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .streamer-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    @media (max-width: 1000px) {
      .streamer-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    /* FAQ */
    .faq-item {
      border-left: 4px solid var(--accent-cyan);
      margin-bottom: 16px;
      background: #fff;
      border-radius: 10px;
      padding: 16px 24px;
      cursor: pointer;
    }
    .faq-item.active {
      border-left-color: var(--accent-pink);
    }

    /* CTA */
    .cta-box {
      text-align: center;
      padding: 80px 20px;
    }
    .footer {
      background: var(--dark-block);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer a {
      color: #aaa;
    }