/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-cyan: #00F0FF;
      --bg-deep: #0A0E1A;
      --card-bg: #131824;
      --text-white: #E8ECF1;
      --text-muted: #8892A6;
      --accent-orange: #FF5E3A;
      --border-glow: rgba(123, 47, 247, 0.25);
      --cyan-glow: rgba(0, 240, 255, 0.2);
      --radius-lg: 16px;
      --radius-xl: 24px;
      --radius-btn: 40px;
      --shadow-card: 0 8px 32px rgba(123, 47, 247, 0.15);
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --section-gap: 120px;
      --card-padding: 32px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 26, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(123, 47, 247, 0.15);
      transition: background 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.7rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-cyan) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 1.8rem;
      filter: drop-shadow(0 0 6px var(--primary-cyan));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-muted);
      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: linear-gradient(to right, var(--primary-cyan), var(--primary-purple));
      transition: width 0.3s ease;
      border-radius: 2px;
    }
    .nav-links a:hover {
      color: #ffffff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      transition: all 0.25s ease;
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
      font-size: 0.9rem;
    }
    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 0 22px rgba(0, 240, 255, 0.6);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links, .btn-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 26, 0.9);
        backdrop-filter: blur(25px);
        border-top: 1px solid rgba(123, 47, 247, 0.3);
        justify-content: space-around;
        align-items: center;
        height: 64px;
        z-index: 999;
        padding: 0 8px;
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-muted);
        font-size: 0.7rem;
        font-weight: 500;
        gap: 4px;
        transition: 0.2s;
      }
      .mobile-bottom-nav a i {
        font-size: 1.4rem;
      }
      .mobile-bottom-nav a:hover {
        color: var(--primary-cyan);
      }
      .navbar {
        background: rgba(10, 14, 26, 0.85);
      }
      .nav-container {
        height: 64px;
      }
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(123,47,247,0.3) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #ffffff, #d0c9ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-cyan));
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      color: #fff;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
    }
    .btn-primary:hover {
      transform: scale(1.04);
      box-shadow: 0 0 28px rgba(123, 47, 247, 0.7);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: var(--primary-cyan);
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.3);
    }
    .live-preview {
      background: rgba(19,24,36,0.8);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 16px;
      border: 1px solid var(--border-glow);
      box-shadow: var(--shadow-card);
    }
    .live-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--accent-orange);
      font-weight: 600;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 2.3rem;
      }
      .section-gap {
        margin: 80px 0;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }
    /* 亮点 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      align-items: start;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: var(--card-padding);
      border: 1px solid rgba(123,47,247,0.2);
      transition: all 0.3s ease;
      position: relative;
    }
    .feature-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
      transform: translateY(-6px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .showcase-masonry {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 24px;
    }
    .showcase-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(123,47,247,0.2);
      transition: 0.3s;
      position: relative;
    }
    .showcase-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 30px rgba(0,240,255,0.25);
    }
    .showcase-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    /* 对比 */
    .comparison-table {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .comp-col {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid rgba(123,47,247,0.2);
    }
    .comp-col.highlight {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.15);
    }
    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: 12px;
      margin-bottom: 16px;
      border-left: 4px solid var(--primary-purple);
      transition: 0.3s;
    }
    .faq-item[open] {
      border-left-color: var(--primary-cyan);
    }
    summary {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
    }
    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0f1322 0%, #1a1030 100%);
      border-radius: var(--radius-xl);
      padding: 64px 48px;
      text-align: center;
      border: 1px solid var(--border-glow);
    }
    .form-group input, .form-group select {
      width: 100%;
      padding: 14px 18px;
      background: #0b0f1c;
      border: 1px solid #2e3250;
      border-radius: 8px;
      color: white;
      margin-bottom: 16px;
    }
    .footer {
      background: #050811;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }