/* roulang page: index */
:root {
      --primary: #00F0FF;
      --primary-dark: #0088CC;
      --accent: #FF6B35;
      --bg-deep: #0A0E17;
      --bg-surface: rgba(10, 14, 23, 0.75);
      --card-bg: rgba(10, 14, 23, 0.7);
      --text-main: #E8ECF1;
      --text-secondary: #8899AA;
      --text-highlight: #00F0FF;
      --border-glow: rgba(0, 240, 255, 0.2);
      --border-subtle: rgba(0, 240, 255, 0.1);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --radius-tag: 4px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
      --shadow-glow: 0 0 20px rgba(0,240,255,0.5), 0 0 60px rgba(0,240,255,0.2);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
      --font-en: 'Inter', 'Roboto', sans-serif;
      --section-gap: 120px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }
    body {
      font-family: var(--font-body);
      background: radial-gradient(circle at 30% 10%, #121a2b 0%, #0A0E17 70%);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.3s ease;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      backdrop-filter: blur(0px);
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 16px 0;
    }
    .nav.scrolled {
      background: rgba(10, 14, 23, 0.9);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid var(--border-glow);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: #fff;
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      box-shadow: 0 0 12px var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover, .nav-links a:focus-visible {
      color: var(--primary);
      outline: none;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary-nav {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 15px rgba(0,240,255,0.4);
      font-size: 0.95rem;
    }
    .btn-primary-nav:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-glow);
      color: var(--primary);
      padding: 8px 12px;
      border-radius: 8px;
      font-size: 1.4rem;
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,14,23,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-glow);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .btn-primary-nav {
        width: 100%;
      }
    }
    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
      color: #fff;
      font-family: var(--font-title);
    }
    .hero-left p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-glow {
      background: linear-gradient(135deg, var(--accent), #e55a2b);
      color: #fff;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 0 25px rgba(255,107,53,0.7);
      letter-spacing: 1px;
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .hero-right {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(0,240,255,0.3);
      border: 1px solid var(--border-glow);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      display: block;
    }
    @media (max-width: 900px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, border-color 0.2s;
    }
    .glass-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .icon-badge {
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .glass-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 解决方案交替布局 */
    .alt-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .alt-img {
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border-glow);
      box-shadow: 0 0 30px rgba(0,240,255,0.15);
    }
    .tag {
      background: var(--accent);
      color: #fff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .alt-row {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }
    /* 数据滚动 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }
    /* 证言滑动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) transparent;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 24px;
    }
    .stars {
      color: var(--accent);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: #fff;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-dark {
      background: #060A10;
      text-align: center;
      padding: 80px 0;
    }
    .footer {
      padding: 40px 0;
      border-top: 1px solid var(--border-subtle);
      display: flex;
      justify-content: space-between;
      color: var(--text-secondary);
    }