/* roulang page: index */
:root {
      --primary-deep: #0A0F1E;
      --accent-cyan: #00F0FF;
      --emphasis-red: #FF4D6D;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(0, 240, 255, 0.15);
      --text-light: rgba(255, 255, 255, 0.75);
      --text-strong: #FFFFFF;
      --section-bg: #111827;
      --radius-lg: 20px;
      --radius-pill: 50px;
      --shadow-glow-red: 0 0 30px rgba(255, 77, 109, 0.5);
      --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.4);
      --transition: 0.3s ease;
      --font-number: 'Inter', 'DIN Alternate', monospace;
      --font-chinese: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1280px;
    }

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

    body {
      font-family: var(--font-chinese);
      background-color: var(--primary-deep);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, .number-font {
      font-family: var(--font-number);
    }

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

    /* 导航栏 - 分屏联动 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 70px;
      background: rgba(10, 15, 30, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      display: flex;
      align-items: center;
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
      transition: height 0.3s ease, background 0.3s ease;
    }

    .nav.scrolled {
      height: 60px;
      background: rgba(10, 15, 30, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-strong);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.3s;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--emphasis-red);
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      text-decoration: none;
      font-size: 15px;
      box-shadow: var(--shadow-glow-red);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 40px rgba(255,77,109,0.7);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
    }

    /* Hero 分屏布局 */
    .hero {
      display: flex;
      min-height: 100vh;
      padding-top: 70px;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 40%);
    }

    .hero-left {
      flex: 1;
      padding: 40px 24px 40px 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .hero-right {
      flex: 1;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 500px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,15,30,0.4);
    }
    .speed-lines {
      position: absolute;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, rgba(0,240,255,0.1) 0px, transparent 3px);
      animation: moveLines 2s linear infinite;
      z-index: 2;
    }
    @keyframes moveLines {
      0% { transform: translateX(0); }
      100% { transform: translateX(20px); }
    }
    .data-card-sim {
      position: relative;
      z-index: 3;
      background: rgba(10,15,30,0.8);
      backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: 20px;
      padding: 24px 32px;
      color: white;
      text-align: center;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .live-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: #FF4D6D;
      border-radius: 50%;
      margin-right: 8px;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,77,109,0.7); }
      70% { box-shadow: 0 0 0 10px rgba(255,77,109,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,77,109,0); }
    }

    h1 {
      font-size: clamp(48px, 8vw, 72px);
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--emphasis-red);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      text-decoration: none;
      box-shadow: var(--shadow-glow-red);
      transition: 0.3s;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      text-decoration: none;
      transition: 0.3s;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: var(--shadow-glow-cyan);
    }

    /* 通用区块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: clamp(36px, 6vw, 44px);
      font-weight: 700;
      background: linear-gradient(to right, #00F0FF, #FFFFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-light);
      max-width: 600px;
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }
    .pain-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      border-left: 4px solid var(--emphasis-red);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: 0.3s;
    }
    .pain-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }
    .sol-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: 0.3s;
    }
    .sol-card.large {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    /* 数据展示 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 40px;
      margin-top: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 64px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF, #FF4D6D);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 证言滚动 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scrollbar-width: thin;
      margin-top: 40px;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 28px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, #111827, #0A0F1E);
    }

    footer {
      background: #0A0F1E;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: unset;
        width: 100%;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .pain-grid, .solution-grid {
        grid-template-columns: 1fr;
      }
    }