/* roulang page: index */
:root {
      --primary-deep: #0B1A3A;
      --accent-cyan: #00E5FF;
      --bg-gradient-start: #0B1A3A;
      --bg-gradient-end: #1A2F4F;
      --text-white: #FFFFFF;
      --text-light-blue: #B0C4DE;
      --card-glass-bg: rgba(255, 255, 255, 0.05);
      --card-glass-border: rgba(0, 229, 255, 0.3);
      --btn-glow: 0 0 20px rgba(0, 229, 255, 0.6);
      --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.3);
      --shadow-card-hover: 0 8px 24px rgba(0, 229, 255, 0.2);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-pill: 50px;
      --font-xl: 36px;
      --font-lg: 28px;
      --font-md: 20px;
      --font-base: 16px;
      --section-gap: 80px;
      --container-max: 1280px;
      --nav-height: 70px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: linear-gradient(135deg, var(--primary-deep) 0%, #1A2F4F 100%);
      color: var(--text-light-blue);
      line-height: 1.8;
      font-size: var(--font-base);
      min-height: 100vh;
      position: relative;
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(0, 229, 255, 0.08) 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;
    }

    h1, h2, h3, h4 {
      color: var(--text-white);
      letter-spacing: 0.5px;
      line-height: 1.3;
    }

    h1 { font-size: var(--font-xl); font-weight: 700; }
    h2 { font-size: var(--font-lg); font-weight: 600; }
    h3 { font-size: var(--font-md); font-weight: 500; }

    p {
      margin-bottom: 1.2em;
      color: var(--text-light-blue);
    }

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: opacity 0.2s;
    }
    a:hover { opacity: 0.85; }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--border-radius-md);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: all 0.25s ease;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(11, 26, 58, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-white);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 38px;
      height: 38px;
      background: var(--accent-cyan);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      font-weight: 800;
      font-size: 20px;
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
    }

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

    .nav-links a {
      color: var(--text-white);
      font-weight: 500;
      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(--accent-cyan);
      transition: width 0.25s ease;
    }

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

    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--border-radius-pill);
      box-shadow: 0 0 15px rgba(0, 229, 255, 0.5);
      font-size: 14px;
      letter-spacing: 0.5px;
      transition: box-shadow 0.3s, transform 0.2s;
    }

    .btn-primary:hover {
      box-shadow: var(--btn-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--border-radius-pill);
      background: rgba(0,229,255,0.05);
    }

    .btn-outline:hover {
      background: rgba(0,229,255,0.15);
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-white);
      transition: 0.3s;
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
      position: relative;
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      overflow: hidden;
    }

    .hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,26,58,0.85) 0%, rgba(11,26,58,0.6) 100%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 3;
      display: flex;
      flex-direction: column;
      gap: 28px;
      max-width: 700px;
    }

    .glass-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(0, 229, 255, 0.25);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    }

    .hero .glass-card {
      animation: glowPulse 3s infinite alternate;
    }

    @keyframes glowPulse {
      0% { box-shadow: 0 0 18px rgba(0,229,255,0.2); }
      100% { box-shadow: 0 0 28px rgba(0,229,255,0.5); }
    }

    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 8px;
    }

    /* 卡片布局 */
    .grid-3 {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }

    .card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-glass-border);
      border-radius: var(--border-radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent-cyan);
    }

    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(0,229,255,0.15);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin: 48px 0;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF, #60EFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
    }

    /* 证言横向滑动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 16px 0 24px;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 280px;
      max-width: 320px;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0,229,255,0.25);
      border-radius: var(--border-radius-md);
      padding: 24px;
      scroll-snap-align: start;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 12px 0;
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 18px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 0;
      cursor: pointer;
      text-align: left;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-light-blue);
    }
    .faq-item.active .faq-answer { max-height: 120px; }

    /* CTA 终极 */
    .cta-band {
      background: rgba(6, 15, 31, 0.9);
      text-align: center;
      padding: 64px 24px;
      border-radius: var(--border-radius-lg);
      margin: 40px 0;
    }

    /* 页脚 */
    .footer {
      background: #060F1F;
      padding: 48px 0 24px;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: 1fr; }
      .grid-2 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 28px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .hero { min-height: 70vh; }
      .footer-grid { grid-template-columns: 1fr; }
      .testimonial-scroll { gap: 16px; }
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      position: absolute;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(11,26,58,0.95);
      backdrop-filter: blur(12px);
      padding: 24px;
      gap: 20px;
    }