/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-gradient: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      --accent-energy: #FF4D2E;
      --accent-hover: #E63E1F;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --text-main: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E5E8EF;
      --success-green: #00B578;
      --warning-orange: #FF9F0A;
      --error-red: #FA5151;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0px 2px 8px rgba(10, 14, 39, 0.06);
      --shadow-md: 0px 8px 24px rgba(10, 14, 39, 0.12);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-base: 200ms ease-out;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #FFFFFF;
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.2s, border-color 0.2s;
    }

    .header.scrolled {
      box-shadow: 0px 2px 8px rgba(10, 14, 39, 0.08);
      border-bottom: 1px solid var(--border-light);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--accent-energy);
    }

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

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      text-decoration: none;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--accent-energy);
    }

    .btn-primary {
      background: var(--accent-energy);
      color: #FFFFFF;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: background 0.15s, box-shadow 0.15s;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(255, 77, 46, 0.3);
    }

    .btn-primary:focus-visible {
      outline: none;
      box-shadow: 0 0 0 3px rgba(255, 77, 46, 0.25);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid rgba(255, 255, 255, 0.6);
      color: #FFFFFF;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: border-color 0.15s, color 0.15s;
    }

    .btn-ghost:hover {
      border-color: var(--accent-energy);
      color: var(--accent-energy);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid #D0D5E0;
      color: var(--text-main);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: border-color 0.15s, color 0.15s;
    }

    .btn-outline:hover {
      border-color: var(--accent-energy);
      color: var(--accent-energy);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary-deep);
      cursor: pointer;
      line-height: 1;
    }

    /* 首屏 */
    .hero {
      background: var(--primary-gradient);
      padding: 120px 0 80px;
      margin-top: 64px;
      position: relative;
      overflow: hidden;
      color: #FFFFFF;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      z-index: 0;
    }

    .hero .container {
      position: relative;
      z-index: 1;
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      color: #FFFFFF;
    }

    .hero-sub {
      font-size: 16px;
      color: rgba(255, 255, 255, 0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-visual img {
      max-width: 100%;
      height: auto;
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .trust-badge {
      margin-top: 24px;
      font-size: 14px;
      color: rgba(255,255,255,0.7);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: 28px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }

    .section-title p {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }

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

    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: #FFF0ED;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-energy);
      font-size: 24px;
    }

    .card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--primary-deep);
    }

    .card p {
      font-size: 16px;
      color: var(--text-secondary);
    }

    /* 场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 64px;
    }

    .scenario-row:last-child {
      margin-bottom: 0;
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-text h2 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .scenario-text ul {
      list-style: none;
    }

    .scenario-text li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 16px;
    }

    .scenario-text li::before {
      content: "●";
      color: var(--accent-energy);
      font-weight: bold;
    }

    .scenario-img {
      flex: 1;
      background: #f0f2f5;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border-light);
    }

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

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      flex: 0 0 280px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
    }

    .case-stat {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-energy);
      margin-bottom: 8px;
    }

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

    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 2px solid transparent;
      transition: 0.2s;
    }

    .pricing-card.featured {
      border-color: var(--accent-energy);
      position: relative;
    }

    .price {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-deep);
      margin: 16px 0;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 16px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      color: var(--text-secondary);
      font-size: 14px;
      margin-top: 0;
    }

    .faq-item.active .faq-answer {
      margin-top: 12px;
      max-height: 200px;
    }

    /* CTA */
    .cta-block {
      background: var(--primary-deep);
      text-align: center;
      padding: 80px 0;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #FFFFFF;
      padding: 60px 0 30px;
      border-top: 1px solid var(--border-light);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 14px;
      display: block;
      margin-bottom: 8px;
    }

    .copyright {
      text-align: center;
      font-size: 14px;
      color: var(--text-secondary);
      border-top: 1px solid var(--border-light);
      padding-top: 20px;
    }

    @media (max-width: 1024px) {
      .grid-3, .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
      .nav-links.open {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero .container {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 28px;
      }
      .grid-3, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }