/* roulang page: index */
:root {
      --primary: #0A1929;
      --secondary: #00D4FF;
      --accent: #FF4D4F;
      --bg-light: #F0F2F5;
      --bg-dark: #0A1929;
      --text-primary: #1A1E2B;
      --text-secondary: #5A6175;
      --text-on-dark: rgba(255,255,255,0.9);
      --text-ondark-muted: rgba(255,255,255,0.65);
      --border-glass: rgba(0,212,255,0.15);
      --border-glass-hover: rgba(0,212,255,0.35);
      --glass-bg: rgba(255,255,255,0.06);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", "PingFang SC", sans-serif;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(16px);
      background: rgba(10,25,41,0.88);
      border-bottom: 1px solid rgba(0,212,255,0.2);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--secondary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,25,41,0.96);
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 28px;
        padding: 40px 0;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: 0.35s ease;
      }
      .mobile-menu.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .mobile-menu a {
        color: white;
        font-size: 1.2rem;
        font-weight: 500;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A1929 0%, #0D2B4A 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top:0; left:0; right:0; bottom:0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-visual {
      flex: 1 1 50%;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 380px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,212,255,0.2);
    }
    h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      max-width: 520px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: #0A1929;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 40px;
      box-shadow: 0 0 24px rgba(0,212,255,0.5);
      font-size: 1rem;
      border: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0,212,255,0.8);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      border-color: var(--secondary);
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      h1 {
        font-size: 32px;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-sub {
      color: var(--text-secondary);
      max-width: 680px;
      margin-bottom: 50px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      transition: var(--transition);
      color: white;
    }
    .glass-card:hover {
      border-color: var(--border-glass-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(0,212,255,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 1.6rem;
      margin-bottom: 20px;
    }
    /* 深色背景区块 */
    .dark-bg {
      background: var(--bg-dark);
      color: white;
    }
    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00D4FF, #7B61FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 证言横向滚动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 10px 0 20px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      flex: 0 0 340px;
      scroll-snap-align: start;
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    .testimonial-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #e0e7ff;
      margin-bottom: 16px;
      overflow: hidden;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e2e8f0;
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 终极CTA */
    .cta-section {
      background: var(--bg-dark);
      text-align: center;
      padding: 100px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
      color: rgba(255,255,255,0.55);
    }