/* roulang page: index */
:root {
      --primary: #7B2FBE;
      --primary-dark: #4A0E78;
      --accent-cyan: #00F0FF;
      --accent-orange: #FF6B35;
      --bg-deep: #0B0C10;
      --bg-card: #1F1F2B;
      --bg-card-light: #2A2A3A;
      --text-white: #FFFFFF;
      --text-body: #B0B3C1;
      --text-muted: #6B6E7D;
      --border-subtle: rgba(123, 47, 190, 0.15);
      --border-input: #3A3A4A;
      --radius-card: 12px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
      --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
      --transition: 0.3s ease;
      --font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-en: 'Inter', 'Roboto', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-zh);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeSpeed;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-white);
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: 0.5px;
    }

    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.1rem; }

    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
      h3 { font-size: 1.3rem; }
    }

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

    a:hover {
      color: var(--accent-cyan);
    }

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-subtle);
      transition: background var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--accent-cyan);
      letter-spacing: 2px;
      text-decoration: none;
    }

    .logo i {
      font-size: 1.8rem;
      color: var(--accent-cyan);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
      white-space: nowrap;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width var(--transition);
    }

    .nav-link:hover {
      color: var(--text-white);
    }

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

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-menu {
        gap: 1.2rem;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11, 12, 16, 0.98);
        flex-direction: column;
        align-items: center;
        gap: 1.8rem;
        padding: 2rem 0;
        transform: translateY(-150%);
        opacity: 0;
        transition: transform 0.4s ease, opacity 0.3s ease;
        backdrop-filter: blur(20px);
      }
      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
      }
      .nav-link {
        font-size: 1.2rem;
      }
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: var(--text-white);
      box-shadow: 0 4px 12px rgba(123, 47, 190, 0.4);
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--accent-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
    }

    /* Hero */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(11, 12, 16, 0.65);
      backdrop-filter: blur(1px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .hero h1 {
      font-size: 3.2rem;
      margin-bottom: 1.5rem;
      text-shadow: 0 0 20px rgba(0,240,255,0.3);
    }

    .highlight {
      color: var(--accent-cyan);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2.5rem;
    }

    .hero-actions {
      display: flex;
      gap: 1.2rem;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 3rem;
    }

    .hero-stats {
      display: flex;
      justify-content: center;
      gap: 3rem;
      flex-wrap: wrap;
      margin-top: 2rem;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--accent-cyan);
      font-family: var(--font-en);
      display: block;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-stats {
        gap: 1.5rem;
      }
    }

    /* 通用区块 */
    .section {
      padding: 7rem 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 4rem;
    }

    .section-header h2 {
      margin-bottom: 0.8rem;
    }

    .divider {
      width: 60px;
      height: 3px;
      background: var(--accent-cyan);
      margin: 0.8rem auto 0;
    }

    /* 价值主张 不对称栅格 */
    .value-grid {
      display: grid;
      grid-template-columns: 1.3fr 0.9fr;
      gap: 28px;
    }

    .value-large {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 2.5rem;
      transition: all var(--transition);
    }

    .value-large:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 10px 25px rgba(0,0,0,0.5);
      transform: translateY(-4px);
    }

    .value-small-group {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .value-small {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      transition: all var(--transition);
    }

    .value-small:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-3px);
    }

    @media (max-width: 768px) {
      .value-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 功能卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .feature-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 8px 25px rgba(0,240,255,0.1);
      transform: translateY(-4px);
    }

    .tag {
      display: inline-block;
      background: rgba(0,240,255,0.12);
      color: var(--accent-cyan);
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      margin-top: 1rem;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

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

    .scene-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .scene-text {
      flex: 1;
    }

    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      min-width: 300px;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      scroll-snap-align: start;
      transition: transform var(--transition);
    }

    .case-card:hover {
      transform: scale(1.02);
    }

    /* 价格表 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--border-subtle);
      text-align: center;
    }

    .pricing-card.featured {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.25);
      position: relative;
    }

    .badge {
      background: var(--accent-orange);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 1rem;
    }

    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      border: 1px solid var(--border-subtle);
    }

    .faq-question {
      padding: 1.4rem 2rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-white);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: var(--bg-card-light);
      padding: 0 2rem;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 1.2rem 2rem;
    }

    /* CTA 表单 */
    .cta-form input, .cta-form textarea {
      width: 100%;
      background: #1a1a24;
      border: 1px solid var(--border-input);
      padding: 14px;
      border-radius: 8px;
      color: white;
      margin-bottom: 1rem;
    }

    .cta-form input:focus, .cta-form textarea:focus {
      border-color: var(--accent-cyan);
      outline: none;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }