/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --bg-card: rgba(15, 23, 42, 0.6);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(255, 255, 255, 0.18);
      --text-primary: #F8FAFC;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --accent-blue: #0EA5E9;
      --accent-orange: #F97316;
      --accent-orange-hover: #FB923C;
      --accent-green: #10B981;
      --accent-red: #EF4444;
      --amber-touch: #D97706;
      --radius-md: 16px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.45);
      --shadow-glow-orange: 0 0 20px rgba(249, 115, 22, 0.4);
      --transition-smooth: all 0.3s ease;
      --container-max: 1200px;
      --nav-height: 72px;
    }

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

    body {
      background-color: var(--bg-deep);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 10%, rgba(14, 165, 233, 0.06) 0%, transparent 45%);
      background-attachment: fixed;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: background 0.3s;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      color: var(--text-primary);
      text-decoration: none;
    }
    .logo i {
      color: var(--accent-orange);
      font-size: 1.8rem;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: #fff;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 20px;
      height: 2px;
      background: var(--accent-blue);
      border-radius: 2px;
    }

    .btn-primary {
      background: var(--accent-orange);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      box-shadow: var(--shadow-glow-orange);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
      letter-spacing: 0.3px;
      border: 1px solid rgba(255,255,255,0.15);
    }
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      box-shadow: 0 0 28px rgba(249,115,22,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.3);
      color: #F8FAFC;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 500;
      transition: var(--transition-smooth);
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: #fff;
      background: rgba(255,255,255,0.05);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 区块 */
    section {
      padding: 100px 0;
    }

    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: clamp(2.4rem, 5vw, 3.2rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
    }
    .hero-text p {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 400px;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      backdrop-filter: blur(8px);
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px;
    }
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    .pain-grid {
      display: flex;
      flex-direction: column;
      gap: 24px;
      max-width: 700px;
      margin: 0 auto;
    }
    .pain-item {
      display: flex;
      align-items: center;
      gap: 20px;
      font-size: 1.15rem;
      color: #CBD5E1;
    }
    .pain-item i {
      font-size: 1.8rem;
      color: var(--accent-blue);
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }
    .glass-card {
      background: rgba(15,23,42,0.55);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      background: rgba(255,255,255,0.06);
      border-color: var(--border-hover);
      transform: translateY(-6px);
    }
    .glass-card i {
      font-size: 2.4rem;
      color: var(--accent-orange);
      margin-bottom: 18px;
    }
    .glass-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.7rem;
    }

    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-family: 'Inter', 'SF Mono', monospace;
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-orange);
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 28px;
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
    }

    .cta-section {
      text-align: center;
      background: rgba(255,255,255,0.02);
      border-radius: 32px;
      padding: 70px 20px;
    }

    footer {
      background: #060A10;
      padding: 40px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
    }