/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-gradient: #10163A;
      --electric-cyan: #00F0FF;
      --amber-gold: #FFB81C;
      --glass-bg: rgba(13, 19, 48, 0.87);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7B94;
      --success-green: #00E676;
      --alert-red: #FF5252;
      --radius-lg: 16px;
      --radius-full: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.5);
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background: var(--bg-deep);
      background-image: linear-gradient(145deg, #0A0E27 0%, #10163A 100%);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
      position: relative;
    }
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      text-decoration: none;
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 10px;
      height: 10px;
      background: var(--electric-cyan);
      box-shadow: 0 0 12px var(--electric-cyan);
      transform: rotate(45deg);
    }
    .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;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-cyan);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--electric-cyan);
      box-shadow: 0 0 10px var(--electric-cyan);
    }
    .nav-cta {
      background: transparent;
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 8px 20px;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .nav-cta:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 18px rgba(0,240,255,0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      width: 100%;
      gap: 40px;
    }
    .hero-content {
      flex: 1 1 55%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 2.5rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--electric-cyan);
      color: #0A0E27;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 0 22px rgba(0,240,255,0.5);
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,240,255,0.8);
      filter: brightness(1.1);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 22px rgba(0,240,255,0.5);
    }
    .hero-metrics {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .metric-item {
      display: flex;
      flex-direction: column;
    }
    .metric-value {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--electric-cyan);
      font-family: 'DIN Alternate', 'Inter', sans-serif;
      line-height: 1.1;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      min-height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .glass-panel {
      background: rgba(13,19,48,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 24px;
      color: white;
      width: 80%;
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 36px rgba(0,0,0,0.6);
      border-color: rgba(0,240,255,0.2);
    }
    .icon-placeholder {
      font-size: 2rem;
      color: var(--electric-cyan);
      margin-bottom: 16px;
    }
    .card-value {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--amber-gold);
    }
    /* 对比 */
    .comparison-row {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .vs-divider {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--electric-cyan);
      text-shadow: 0 0 12px var(--electric-cyan);
    }
    .left-card, .right-card {
      flex: 1;
      border-radius: var(--radius-lg);
      padding: 32px;
    }
    .left-card {
      background: rgba(255,82,82,0.1);
      border: 1px solid rgba(255,82,82,0.3);
    }
    .right-card {
      background: rgba(0,230,118,0.08);
      border: 1px solid rgba(0,230,118,0.3);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      color: var(--text-secondary);
      margin-top: 8px;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 30% 30%, rgba(0,240,255,0.15), transparent 70%);
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .form-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 14px 20px;
      border-radius: 30px;
      color: white;
      outline: none;
      min-width: 200px;
    }
    .form-input:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 12px var(--electric-cyan);
    }
    footer {
      background: #060A1A;
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .grid-3 {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .comparison-row {
        flex-direction: column;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }