/* roulang page: index */
:root {
      --primary: #0A84FF;
      --primary-dark: #0066CC;
      --secondary: #6C3CEC;
      --accent: #00F5D4;
      --bg-dark: #0B0D17;
      --bg-secondary: #131627;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.5);
      --glow: 0 0 20px rgba(10, 132, 255, 0.4);
      --glow-accent: 0 0 18px rgba(0, 245, 212, 0.35);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 20px;
      --font-sans: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --transition: all 0.3s ease;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
      transition: var(--transition);
    }

    .glass-card:hover {
      border-color: rgba(10, 132, 255, 0.45);
      box-shadow: 0 0 28px rgba(10, 132, 255, 0.25), 0 12px 32px rgba(0,0,0,0.5);
      transform: translateY(-4px);
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
      letter-spacing: 0.3px;
      gap: 8px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 14px rgba(10, 132, 255, 0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 24px rgba(10, 132, 255, 0.6);
      transform: translateY(-2px);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: white;
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 20px rgba(10,132,255,0.3);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      color: var(--text-secondary);
      padding: 8px 16px;
      text-decoration: underline;
      text-underline-offset: 4px;
      text-decoration-color: rgba(255,255,255,0.2);
    }

    .btn-ghost:hover {
      color: var(--accent);
      text-decoration-color: var(--accent);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 13, 23, 0.88);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(10, 132, 255, 0.18);
      z-index: 1000;
      padding: 16px 0;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: white;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .logo .accent {
      color: var(--accent);
      text-shadow: 0 0 12px rgba(0, 245, 212, 0.6);
    }

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

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 10px var(--primary);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: white;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

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

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11, 13, 23, 0.98);
      backdrop-filter: blur(30px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      z-index: 999;
    }

    .mobile-menu a {
      font-size: 1.8rem;
      color: white;
      text-decoration: none;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      padding: 160px 0 120px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,13,23,0.9) 40%, rgba(11,13,23,0.5) 100%);
    }

    .hero-content {
      position: relative;
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-text h1 {
      font-size: clamp(2.8rem, 6vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-text .highlight {
      color: var(--accent);
      text-shadow: 0 0 20px rgba(0,245,212,0.4);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 520px;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }

    .dynamic-shape {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 30% 30%, rgba(10,132,255,0.25), transparent 70%);
      border-radius: 40% 60% 30% 70% / 50% 40% 60% 50%;
      animation: morph 8s infinite alternate;
      filter: drop-shadow(0 0 40px rgba(0,245,212,0.25));
    }

    @keyframes morph {
      0% { border-radius: 40% 60% 30% 70% / 50% 40% 60% 50%; }
      100% { border-radius: 60% 40% 70% 30% / 40% 50% 50% 60%; }
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 18px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 56px;
    }

    .bg-alternate {
      background-color: var(--bg-secondary);
    }

    /* 优势卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-card {
      text-align: center;
      padding: 36px 20px;
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(10,132,255,0.12);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary);
      font-size: 28px;
    }

    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-img {
      flex: 1;
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-lg);
      height: 300px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .feature-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .feature-text {
      flex: 1;
    }

    .check-list {
      list-style: none;
      margin-top: 20px;
    }

    .check-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      color: var(--text-secondary);
    }

    .check-list i {
      color: var(--accent);
    }

    /* 场景卡片 */
    .grid-2x2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .scenario-card {
      padding: 32px;
      text-align: left;
    }

    /* 案例卡片 */
    .case-grid {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 15px;
    }

    .case-card {
      min-width: 280px;
      flex: 1;
      padding: 28px;
    }

    .metric {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 18px;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    .faq-answer {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0B0D17 0%, #131627 100%);
      text-align: center;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 48px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .feature-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .grid-2x2, .faq-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; }
      .dynamic-shape { width: 200px; height: 200px; }
      .footer-grid { grid-template-columns: 1fr; }
    }