/* roulang page: index */
:root {
      --bg-deep: #0A0E1A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --bg-card-hover: rgba(255, 255, 255, 0.06);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(255, 255, 255, 0.25);
      --cyan: #00E5FF;
      --cyan-soft: #00C2FF;
      --orange-pulse: #FF6B35;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #7A8BA0;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), inset 0 0 1px rgba(255,255,255,0.1);
      --shadow-glow: 0 0 30px rgba(0,229,255,0.15);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background: radial-gradient(circle at 30% 10%, #1A2030 0%, #0A0E1A 80%);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 背景动态网格与波形 */
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      background-image: 
        repeating-linear-gradient(0deg, rgba(0,229,255,0.02) 0px, rgba(0,229,255,0.02) 1px, transparent 1px, transparent 40px),
        repeating-linear-gradient(90deg, rgba(0,229,255,0.02) 0px, rgba(0,229,255,0.02) 1px, transparent 1px, transparent 40px);
      pointer-events: none;
      z-index: 0;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: saturate(180%) blur(20px);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 100;
      height: 70px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: white;
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: radial-gradient(circle at 30% 30%, var(--cyan), #004466);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 12px var(--cyan);
    }

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

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.2s;
    }

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

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      z-index: 120;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    /* 区块通用 */
    section {
      position: relative;
      z-index: 2;
      padding: 100px 0;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.8px;
    }

    h2 {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }

    .section-title {
      margin-bottom: 48px;
      text-align: center;
    }

    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--orange-pulse));
      border: none;
      color: white;
      font-weight: bold;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 1rem;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,229,255,0.4);
      transition: 0.25s;
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.7);
      transform: scale(1.05);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: 0.25s;
      text-decoration: none;
      display: inline-block;
    }

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

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 70px;
      position: relative;
    }

    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text h1 {
      margin-bottom: 20px;
    }

    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 400px;
      opacity: 0.25;
      box-shadow: 0 0 50px rgba(0,229,255,0.3);
      border: 1px solid rgba(255,255,255,0.1);
      backdrop-filter: blur(4px);
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--bg-card);
      backdrop-filter: saturate(180%) blur(20px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px 20px;
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
      border-left: 3px solid var(--cyan);
    }

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

    .metric-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--cyan);
      line-height: 1;
      margin-bottom: 8px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--bg-card);
      backdrop-filter: saturate(180%) blur(20px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      border-color: var(--border-glow);
      box-shadow: 0 0 30px rgba(0,229,255,0.2);
      transform: translateY(-6px);
    }

    .service-icon {
      font-size: 28px;
      color: var(--cyan);
      margin-bottom: 20px;
    }

    .results-comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: rgba(0,0,0,0.3);
      border-radius: 24px;
      padding: 40px;
      backdrop-filter: blur(12px);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 180px;
      margin-top: 12px;
    }

    .cta-block {
      background: rgba(10,14,26,0.7);
      backdrop-filter: blur(20px);
      text-align: center;
      padding: 80px 0;
      border-radius: 32px;
    }

    footer {
      background: #060A14;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

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

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .hero-content { grid-template-columns: 1fr; }
      .hero-visual { height: 250px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .metrics-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .results-comparison { grid-template-columns: 1fr; }
    }