/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-hover: #E04A1A;
      --dark: #1E1E24;
      --warm-bg: #FAF8F5;
      --white: #FFFFFF;
      --gold: #D4AF37;
      --text-main: #1E1E24;
      --text-secondary: #4A4A55;
      --text-light: #7A7A85;
      --border-light: #E8E6E1;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-button: 8px;
      --transition: 0.2s ease;
      --max-width: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 700;
    }
    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    p {
      color: var(--text-secondary);
      line-height: 1.7;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }
    /* 导航栏 */
    .main-header {
      background: var(--white);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      border-bottom: 1px solid transparent;
      transition: border-color 0.2s;
      display: flex;
      align-items: center;
    }
    .main-header.scrolled {
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 16px;
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(241,90,36,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(241,90,36,0.3);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(241,90,36,0.05);
    }
    .btn-white-outline {
      border: 2px solid white;
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-button);
      font-weight: 600;
    }
    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .mobile-menu-toggle {
      display: none;
      font-size: 26px;
      background: none;
      border: none;
      color: var(--dark);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1E1E24 0%, #2A2A32 100%);
      color: white;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      right: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      mask-image: linear-gradient(to left, black 30%, transparent 90%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      line-height: 1.5;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-header h2 {
      color: var(--dark);
    }
    .section-header p {
      color: var(--text-light);
      max-width: 600px;
      margin: 0 auto;
      font-size: 18px;
    }
    /* 核心优势 非对称布局 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      gap: 24px;
      align-items: flex-start;
      border-left: 4px solid transparent;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
      border-left: 4px solid var(--primary);
    }
    .feature-card.span-row {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
      background: var(--white);
      border-left: 4px solid transparent;
    }
    .feature-card.span-row:hover {
      border-left: 4px solid var(--primary);
    }
    .feature-icon {
      font-size: 32px;
      min-width: 48px;
      color: var(--primary);
    }
    .feature-text h3 {
      margin-bottom: 8px;
    }
    /* 数据板块 */
    .stats-section {
      background: #F0EDE8;
      padding: 70px 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 32px;
    }
    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 18px;
      margin-top: 8px;
    }
    /* 案例卡片 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
      scroll-snap-align: start;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      background: rgba(241,90,36,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      color: var(--dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F5F5F5;
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      padding: 80px 0;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 480px;
      margin: 32px auto 0;
    }
    .cta-form input, .cta-form textarea {
      padding: 14px 16px;
      border-radius: 6px;
      border: none;
      font-size: 16px;
      background: white;
    }
    .cta-form input:focus, .cta-form textarea:focus {
      outline: 2px solid var(--dark);
    }
    .btn-dark {
      background: var(--dark);
      color: white;
      padding: 14px;
      border-radius: var(--radius-button);
      font-weight: 700;
    }
    .btn-dark:hover {
      background: black;
    }
    /* 页脚 */
    .footer {
      background: var(--dark);
      color: rgba(255,255,255,0.8);
      padding: 40px 0;
      text-align: center;
    }
    .footer .brand {
      font-size: 20px;
      font-weight: 700;
      color: white;
    }
    /* 移动端 */
    @media (max-width: 768px) {
      h1 { font-size: 34px; }
      h2 { font-size: 28px; }
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .mobile-nav {
        display: none;
        position: fixed;
        top: 0; left: 0; width: 100%; height: 100%;
        background: var(--white);
        z-index: 100;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 24px;
        font-size: 20px;
      }
      .mobile-nav.active { display: flex; }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-card.span-row {
        grid-row: auto;
      }
      .hero {
        padding: 60px 0;
        min-height: auto;
      }
      .hero::before { width: 100%; opacity: 0.15; }
      .stats-grid { flex-direction: column; }
    }