/* roulang page: index */
:root {
      --deep-blue: #0A1128;
      --dark-blue: #0B1D3A;
      --electric-blue: #0077FF;
      --cyan-blue: #00C2FF;
      --accent-orange: #FF6B35;
      --glass-bg: rgba(10, 20, 50, 0.55);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(255, 255, 255, 0.2);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.8);
      --text-dim: rgba(255, 255, 255, 0.6);
      --card-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
      --glow-blue: 0 0 18px rgba(0, 194, 255, 0.4);
      --radius-lg: 22px;
      --radius-md: 14px;
      --radius-pill: 40px;
      --font-heading: 'Rajdhani', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background: var(--deep-blue);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 20% 10%, rgba(0, 119, 255, 0.12) 0%, transparent 35%);
      background-attachment: fixed;
    }

    .container {
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--glass-hover-border);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6), 0 0 24px rgba(0, 194, 255, 0.25);
    }

    h1, h2, h3, .sport-number {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: clamp(2.8rem, 7vw, 4.2rem);
      line-height: 1.15;
    }
    h2 {
      font-size: clamp(2rem, 5vw, 2.8rem);
      color: #E0F0FF;
      margin-bottom: 0.75rem;
      font-weight: 600;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    .section-desc {
      color: var(--text-dim);
      font-size: 1.1rem;
      max-width: 700px;
      margin: 0 auto 3rem auto;
    }

    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-blue), var(--cyan-blue));
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 38px;
      border-radius: var(--radius-pill);
      font-size: 1rem;
      letter-spacing: 0.4px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s;
      box-shadow: 0 6px 18px rgba(0,119,255,0.5);
      text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(0,194,255,0.8), 0 10px 24px rgba(0,0,0,0.5);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.22);
      color: white;
      padding: 12px 30px;
      border-radius: 30px;
      backdrop-filter: blur(8px);
      transition: 0.25s;
      font-weight: 500;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--cyan-blue);
      background: rgba(0,194,255,0.1);
      color: white;
    }

    /* 吸顶导航 */
    .header-portal {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(8, 16, 40, 0.8);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.07);
      transition: background 0.3s;
    }
    .brand-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(to right, #fff, #c0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .trend-tags {
      display: flex;
      gap: 16px;
      color: var(--text-dim);
      font-size: 0.85rem;
    }
    .trend-tags i {
      color: var(--cyan-blue);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      padding: 8px 0 12px;
      flex-wrap: wrap;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-blue);
      box-shadow: 0 0 10px var(--cyan-blue);
      transition: width 0.3s;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }

    /* Hero 双栏 */
    .hero-magazine {
      display: flex;
      align-items: center;
      gap: 40px;
      padding: 50px 0 70px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-right {
      flex: 1 1 400px;
      position: relative;
    }
    .hero-img-card {
      width: 100%;
      aspect-ratio: 4/3;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7), 0 0 30px rgba(0,119,255,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 亮点网格 非对称 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .highlight-item {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 28px 18px;
      text-align: center;
      transition: 0.3s;
    }
    .highlight-item i {
      font-size: 2.4rem;
      color: var(--cyan-blue);
      margin-bottom: 14px;
      text-shadow: 0 0 12px var(--cyan-blue);
    }
    .highlight-item:hover {
      transform: translateY(-6px);
      border-color: var(--cyan-blue);
    }

    /* 案例瀑布流 */
    .waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #0b1a2f;
      aspect-ratio: 3/4;
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      background: linear-gradient(transparent, rgba(10,20,50,0.9));
      padding: 24px 16px;
      backdrop-filter: blur(6px);
    }
    .case-card:hover img {
      transform: scale(1.04);
    }

    /* 对比卡片 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .compare-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      padding: 32px 20px;
      border: 1px solid var(--glass-border);
    }
    .compare-card.featured {
      border-color: var(--accent-orange);
      box-shadow: 0 0 22px rgba(255,107,53,0.4);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }

    .footer {
      background: rgba(5, 12, 30, 0.9);
      backdrop-filter: blur(10px);
      padding: 40px 0 20px;
      margin-top: 60px;
    }

    @media (max-width: 1024px) {
      .highlight-grid { grid-template-columns: repeat(2, 1fr); }
      .waterfall { grid-template-columns: repeat(2, 1fr); }
      .compare-grid { grid-template-columns: 1fr; }
      .nav-links { gap: 20px; }
    }
    @media (max-width: 640px) {
      .mobile-toggle { display: block; }
      .nav-links { display: none; flex-direction: column; background: #0a1630; padding: 16px; }
      .nav-links.open { display: flex; }
      .hero-magazine { flex-direction: column; }
      .highlight-grid { grid-template-columns: 1fr; }
      .waterfall { grid-template-columns: 1fr; }
    }