/* roulang page: index */
:root {
      --primary: #7B2FBE;
      --primary-light: #9B4DDB;
      --accent: #00F0FF;
      --bg-deep: #0A0A0F;
      --surface: #1A1A24;
      --surface-dark: #12121A;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: #888888;
      --border-subtle: rgba(123,47,190,0.15);
      --border-glow: rgba(0,240,255,0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 20px rgba(0,240,255,0.25);
      --shadow-card: 0 8px 32px rgba(123,47,190,0.3);
      --transition: 0.3s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 10, 15, 0.92);
      backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(123,47,190,0.2);
      padding: 0 24px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FBE, #9B4DDB);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }

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

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
      text-shadow: 0 0 8px rgba(0,240,255,0.6);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
    }

    .nav-cta {
      background: linear-gradient(135deg, #7B2FBE, #9B4DDB);
      color: white;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      border: 1px solid rgba(0,240,255,0.4);
      font-weight: 600;
      transition: all 0.25s;
      font-size: 0.9rem;
      margin-left: 1rem;
    }

    .nav-cta:hover {
      background: #9B4DDB;
      border-color: var(--accent);
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
      color: white;
    }

    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: white;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 100px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(10,10,15,0.7) 0%, rgba(123,47,190,0.3) 100%);
      backdrop-filter: blur(2px);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    .hero-left .sub {
      font-size: 1.2rem;
      color: #ccc;
      margin-bottom: 2rem;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #7B2FBE, #9B4DDB);
      border: none;
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      border: 1px solid transparent;
    }

    .btn-primary:hover {
      background: #9B4DDB;
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: var(--accent);
      color: #0A0A0F;
    }

    .hero-right {
      background: rgba(26,26,36,0.5);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      padding: 2rem;
      border: 1px solid rgba(123,47,190,0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 300px;
    }

    .hero-visual {
      width: 100%;
      height: 240px;
      background: radial-gradient(circle at 30% 30%, rgba(123,47,190,0.5), transparent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 3rem;
      color: var(--accent);
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .feature-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      border: 1px solid var(--border-subtle);
      transition: all var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent);
      box-shadow: var(--shadow-glow);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }

    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.7rem;
    }

    .stat-highlight {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
      margin-top: 1rem;
    }

    /* 案例瀑布 */
    .case-row {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      margin-bottom: 4rem;
      flex-wrap: wrap;
    }

    .case-img {
      flex: 1 1 45%;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(123,47,190,0.3);
    }

    .case-img img {
      transition: transform 0.4s;
    }

    .case-img:hover img {
      transform: scale(1.03);
    }

    .case-content {
      flex: 1 1 45%;
    }

    .tag {
      background: rgba(123,47,190,0.2);
      color: var(--accent);
      padding: 0.2rem 0.9rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.8rem;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: var(--surface);
      border-radius: 16px;
      overflow: hidden;
    }

    .col-highlight {
      border: 2px solid var(--accent);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
      border-radius: 12px;
      position: relative;
    }

    .badge {
      background: var(--accent);
      color: #0A0A0F;
      font-weight: 700;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    /* 数据带 */
    .stats-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding: 1rem 0;
    }

    .stat-item {
      min-width: 160px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* FAQ */
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      background: var(--surface-dark);
      border: none;
    }

    /* CTA */
    .cta-banner {
      background: #0D0D14;
      text-align: center;
    }

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

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

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }