/* roulang page: index */
:root {
      --deep-space: #0B0E17;
      --electric-purple: #7B2FFF;
      --cyan-neon: #00F0FF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --body-text: #B0B8C5;
      --light-text: #E8ECF1;
      --white: #FFFFFF;
      --footer-bg: #06090F;
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --hover-glow: 0 0 20px rgba(0, 240, 255, 0.15);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-img: 12px;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--body-text);
      line-height: 1.8;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .site-header {
      background: #FFFFFF;
      box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      color: #0B0E17;
      font-weight: 700;
      font-size: 1.5rem;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: var(--electric-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      color: #4A5568;
      font-weight: 500;
      position: relative;
      padding: 0.25rem 0;
      font-size: 0.95rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--electric-purple);
      transition: width 0.3s ease, left 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--electric-purple);
    }

    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }

    .search-box {
      background: #F1F3F5;
      border-radius: 50px;
      padding: 0.5rem 1.2rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: #8A94A6;
      font-size: 0.9rem;
      border: 1px solid transparent;
    }

    .search-box i {
      font-size: 0.9rem;
    }

    .btn-cta {
      background: var(--electric-purple);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(123, 47, 255, 0.5);
      transition: var(--transition-smooth);
      white-space: nowrap;
    }

    .btn-cta:hover {
      background: #9355FF;
      box-shadow: 0 0 35px rgba(123, 47, 255, 0.8);
      transform: scale(1.05);
      color: white;
    }

    .mobile-toggle {
      display: none;
      font-size: 1.8rem;
      color: #0B0E17;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B0E17 0%, #141A26 100%);
      padding: 3rem 0 4rem;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(123,47,255,0.08) 0%, transparent 50%);
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1.2;
    }

    .hero-right {
      flex: 0.9;
    }

    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #B0B8C5;
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--electric-purple);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 700;
      border: none;
      box-shadow: 0 0 20px rgba(123,47,255,0.5);
      transition: var(--transition-smooth);
    }

    .btn-primary:hover {
      background: #9355FF;
      box-shadow: 0 0 35px rgba(123,47,255,0.8);
      transform: scale(1.05);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.3);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 700;
      transition: var(--transition-smooth);
    }

    .btn-secondary:hover {
      border-color: var(--cyan-neon);
      color: var(--cyan-neon);
    }

    .hero-image {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      border: 1px solid var(--glass-border);
      box-shadow: 0 0 30px rgba(123,47,255,0.2);
      overflow: hidden;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 1rem;
      text-align: center;
    }

    .section-desc {
      color: var(--body-text);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: rgba(0,240,255,0.4);
      box-shadow: var(--hover-glow);
      transform: translateY(-4px);
    }

    .icon-circle {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      border: 2px solid var(--cyan-neon);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyan-neon);
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 0.8rem;
    }

    /* 案例瀑布流 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .case-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-card);
      border: 1px solid var(--glass-border);
      overflow: hidden;
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      border-color: rgba(0,240,255,0.4);
      transform: translateY(-5px);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 1.5rem;
    }

    .tag {
      background: var(--electric-purple);
      color: white;
      border-radius: 20px;
      padding: 0.2rem 1rem;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.8rem;
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 2rem;
      align-items: center;
    }

    .vs-divider {
      font-size: 2rem;
      font-weight: 800;
      color: var(--cyan-neon);
      text-shadow: 0 0 15px rgba(0,240,255,0.5);
    }

    .compare-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--glass-border);
    }

    .compare-card.highlight {
      border-color: rgba(0,240,255,0.5);
      box-shadow: 0 0 25px rgba(0,240,255,0.2);
      background: rgba(0,240,255,0.02);
    }

    /* FAQ */
    .accordion-item {
      background: rgba(255,255,255,0.02);
      border-radius: 12px;
      margin-bottom: 1rem;
      border: 1px solid var(--glass-border);
    }

    .accordion-title {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--white);
      padding: 1.2rem 1.8rem;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
    }

    .accordion-content {
      padding: 0 1.8rem 1.5rem;
      color: var(--body-text);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #0B0E17 radial-gradient(circle at 30% 40%, rgba(123,47,255,0.15), transparent 60%);
      padding: 5rem 0;
      text-align: center;
    }

    .footer {
      background: var(--footer-bg);
      padding: 4rem 0 2rem;
      color: #B0B8C5;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 3rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links, .search-box, .header .btn-cta { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { flex-direction: column-reverse; }
      .hero h1 { font-size: 2rem; }
      .section-title { font-size: 1.75rem; }
      .card-grid, .case-grid, .footer-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .vs-divider { text-align: center; }
    }