/* roulang page: index */
:root {
      --deep-bg: #060913;
      --primary-bg: #0B0E1E;
      --card-bg: rgba(255,255,255,0.03);
      --glass-bg: rgba(12,22,38,0.5);
      --glass-border: rgba(0,229,255,0.15);
      --cyan: #00E5FF;
      --warm-gold: #FFB74D;
      --gold-dark: #FF9800;
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-secondary: #7B8CA8;
      --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-en: 'Inter', 'SF Mono', monospace;
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-chip: 20px;
      --shadow-card: 0 8px 32px rgba(0,229,255,0.08);
      --shadow-hover: 0 16px 48px rgba(0,229,255,0.18);
      --glow-cyan: 0 0 20px rgba(0,229,255,0.5);
      --glow-gold: 0 0 20px rgba(255,183,77,0.6);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-cn);
      background-color: var(--deep-bg);
      color: var(--text-body);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-cn);
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    a {
      color: var(--cyan);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--warm-gold);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏样式 */
    .glass-nav {
      background: rgba(6,9,19,0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,229,255,0.1);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      height: 100%;
    }

    .logo {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--cyan);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
      text-shadow: 0 0 12px rgba(0,229,255,0.4);
    }

    .chip-group {
      display: flex;
      gap: 8px;
      align-items: center;
      flex-wrap: wrap;
    }

    .chip {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.1);
      color: #8899AA;
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      font-size: 0.9rem;
      font-weight: 500;
      cursor: default;
      transition: all 0.25s;
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(4px);
    }

    .chip.active {
      background: var(--cyan);
      color: #0B0E1E;
      border-color: var(--cyan);
      font-weight: 600;
      box-shadow: 0 0 15px rgba(0,229,255,0.4);
    }

    .cta-btn-nav {
      background: linear-gradient(135deg, var(--warm-gold), var(--gold-dark));
      border: none;
      color: #0B0E1E;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 4px 15px rgba(255,152,0,0.3);
      white-space: nowrap;
    }

    .cta-btn-nav:hover {
      transform: translateY(-2px);
      box-shadow: var(--glow-gold);
    }

    /* 汉堡菜单隐藏桌面 */
    .hamburger {
      display: none;
      color: white;
      font-size: 1.8rem;
    }

    /* 区块通用 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-title {
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
      text-align: center;
      background: linear-gradient(to right, #fff, #B0C4DE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .section-sub {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 3rem;
      color: var(--text-secondary);
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,255,0.08) 0%, transparent 50%), var(--primary-bg);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M10 10 L90 10 L90 90 L10 90 Z" fill="none" stroke="rgba(0,229,255,0.08)" stroke-width="0.5"/><path d="M20 0 L20 100 M40 0 L40 100 M60 0 L60 100 M80 0 L80 100" fill="none" stroke="rgba(0,229,255,0.04)" stroke-width="0.3"/></svg>');
      background-size: 60px 60px;
      pointer-events: none;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1 1 520px;
    }

    .hero-right {
      flex: 1 1 500px;
      display: flex;
      justify-content: center;
    }

    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #FFB74D, #FF9800);
      border: none;
      color: #0B0E1E;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: 0 4px 20px rgba(255,152,0,0.5);
      cursor: pointer;
      transition: 0.3s;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(255,183,77,0.8);
      transform: translateY(-3px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
    }

    .hero-img {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      width: 100%;
      height: 360px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7), 0 0 30px rgba(0,229,255,0.3);
      position: relative;
    }

    /* 功能标签区 */
    .tab-nav {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-bottom: 3rem;
    }

    .tab-btn {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.15);
      color: #8899AA;
      padding: 10px 28px;
      border-radius: 30px;
      font-weight: 600;
      transition: 0.25s;
      cursor: pointer;
    }

    .tab-btn.active {
      background: var(--cyan);
      color: #0B0E1E;
      border-color: var(--cyan);
    }

    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 2rem;
      display: flex;
      gap: 2rem;
      align-items: center;
      box-shadow: var(--shadow-card);
    }

    .feature-text {
      flex: 1;
    }

    .feature-img {
      flex: 1.2;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      height: 240px;
      border-radius: 16px;
    }

    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scene-card {
      background: rgba(12,22,38,0.45);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      border: 1px solid rgba(255,255,255,0.05);
      transition: 0.3s;
    }

    .scene-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 40px rgba(0,229,255,0.2);
    }

    /* 案例 */
    .case-card {
      background: rgba(255,255,255,0.02);
      border-left: 4px solid var(--cyan);
      padding: 1.5rem;
      border-radius: 0 12px 12px 0;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      padding: 2.5rem 1.8rem;
      border: 1px solid rgba(255,255,255,0.08);
      text-align: center;
    }

    .price-card.recommend {
      border: 2px solid var(--cyan);
      box-shadow: 0 0 30px rgba(0,229,255,0.3);
    }

    .price-num {
      font-size: 3.2rem;
      font-weight: 700;
      color: white;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 12px;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: white;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
      }
      .scene-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .chip-group {
        display: none;
      }
      .hamburger {
        display: block;
      }
      section {
        padding: 60px 0;
      }
    }