/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --secondary: #1A1A2E;
      --accent: #FFB300;
      --bg-light: #FAFAFA;
      --bg-card: #F5F5F5;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-white: #FFFFFF;
      --success: #0F9D58;
      --border-light: #EAEAEA;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-vip: 0 0 0 1px #FFB300, 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-tag: 4px;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, "Inter", sans-serif;
      --font-number: "DIN Alternate", "Roboto", "PingFang SC", sans-serif;
      --max-width: 1280px;
    }

    * {
      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;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition-smooth);
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: var(--transition-smooth);
      padding: 16px 0;
      background: transparent;
    }

    #header.scrolled {
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      padding: 10px 0;
    }

    #header.scrolled .nav-link {
      color: var(--text-main);
    }

    #header.scrolled .logo-text {
      color: var(--primary);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-smooth);
    }

    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }

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

    .nav-link {
      font-weight: 500;
      font-size: 1rem;
      color: rgba(255,255,255,0.9);
      transition: var(--transition-smooth);
      position: relative;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 12px rgba(229,57,53,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(229,57,53,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(229,57,53,0.08);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: none;
      border: none;
    }

    #header.scrolled .hamburger {
      color: var(--text-main);
    }

    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--secondary);
        flex-direction: column;
        padding: 80px 32px 32px;
        gap: 28px;
        transition: right 0.3s ease;
        box-shadow: -4px 0 20px rgba(0,0,0,0.2);
        align-items: flex-start;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-link {
        color: white !important;
        font-size: 1.2rem;
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #2D2D44 100%);
      color: white;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-left {
      animation: fadeInUp 0.8s ease;
    }

    .hero-badge {
      display: flex;
      gap: 16px;
      margin: 24px 0 32px;
      flex-wrap: wrap;
    }

    .badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-right {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      animation: slowScale 8s infinite alternate;
    }

    @keyframes slowScale {
      0% { transform: scale(1); }
      100% { transform: scale(1.03); }
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(24px); }
      to { opacity: 1; transform: translateY(0); }
    }

    h1 {
      font-size: 3.2rem;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin: 20px 0;
    }

    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      h1 {
        font-size: 2.4rem;
      }
      .hero-right {
        order: -1;
        max-height: 300px;
      }
    }

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

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }

    /* 优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      text-align: center;
    }

    .feature-card:nth-child(2) {
      transform: translateY(-20px);
    }

    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
    }

    .feature-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-card:nth-child(2) {
        transform: none;
      }
    }

    /* 亮点瀑布流 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .highlight-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }

    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .highlight-img {
      position: relative;
      aspect-ratio: 16/9;
      background: #e0e0e0;
    }

    .highlight-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--primary);
      color: white;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      font-size: 0.8rem;
      font-weight: 600;
    }

    .highlight-content {
      padding: 20px;
    }

    @media (max-width: 1024px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .compare-container {
      display: flex;
      justify-content: center;
      gap: 32px;
      align-items: flex-start;
      flex-wrap: wrap;
    }

    .plan-card {
      background: white;
      padding: 40px 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      flex: 1;
      min-width: 260px;
      max-width: 360px;
      transition: var(--transition-smooth);
    }

    .plan-vip {
      box-shadow: var(--shadow-vip);
      border: 1px solid var(--accent);
    }

    .plan-price {
      font-size: 2.4rem;
      font-weight: 700;
      margin: 16px 0;
    }

    .feature-list {
      list-style: none;
      margin: 24px 0;
    }

    .feature-list li {
      margin: 12px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 数据看板 */
    #cases {
      background: var(--secondary);
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent);
    }

    @media (max-width: 600px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }

    /* 联系CTA */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-card);
      margin: 0 24px;
    }

    .contact-form {
      max-width: 480px;
      margin: 32px auto 0;
    }

    .input-line {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.5);
      padding: 12px 0;
      width: 100%;
      margin-bottom: 20px;
      color: white;
      font-size: 1rem;
      outline: none;
      transition: border-color 0.2s;
    }

    .input-line:focus {
      border-bottom-color: white;
    }

    /* 页脚 */
    footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

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