/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --accent-gold: #D4AF37;
      --black: #1D1D1F;
      --gray-dark: #4A4A4A;
      --gray-mid: #7A7A7A;
      --gray-light: #B0B0B0;
      --bg-warm: #F8F7F4;
      --bg-card: #FFFFFF;
      --bg-faq: #F0EFEC;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --radius-dock: 40px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Courier New', monospace;
      --max-width: 1200px;
      --section-gap: 120px;
    }

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

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      color: var(--gray-dark);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      color: var(--black);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
      margin-bottom: 24px;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 600;
      border: none;
      outline: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

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

    /* 浮动Dock导航 */
    .nav-dock {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: 90%;
      max-width: 620px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-dock);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 32px rgba(0,0,0,0.08);
      z-index: 1000;
      transition: all 0.3s ease;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--primary);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      font-weight: 500;
      color: var(--black);
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
    }

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

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

    .btn-primary-small {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 15px;
      font-weight: 600;
      white-space: nowrap;
    }

    .btn-primary-small:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      font-size: 28px;
      background: none;
      color: var(--black);
    }

    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      font-size: 24px;
      font-weight: 600;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      color: var(--black);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      background: radial-gradient(circle at 80% 20%, rgba(230,57,70,0.03) 0%, transparent 60%);
    }

    .hero-content {
      flex: 1;
    }

    .hero-content h1 {
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--gray-dark);
      margin-bottom: 40px;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }

    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }

    .hero-image {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      background: #ddd;
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 通用区块 */
    .section {
      padding: var(--section-gap) 0;
    }

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

    .gold-underline {
      width: 60px;
      height: 4px;
      background: var(--accent-gold);
      margin: 16px auto 0;
      border-radius: 2px;
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--bg-card);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

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

    .advantage-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 0%;
      height: 3px;
      background: var(--accent-gold);
      transition: width 0.3s ease;
    }

    .advantage-card:hover::before {
      width: 100%;
    }

    .advantage-icon {
      font-size: 32px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }

    .advantage-card h3 {
      margin-bottom: 12px;
    }

    /* 服务卡片 */
    .service-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

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

    .service-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .service-text {
      flex: 1;
    }

    .service-text h3 {
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      margin: 20px 0;
    }

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

    .feature-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    /* 数据深色区 */
    .dark-banner {
      background: var(--black);
      padding: 80px 0;
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--gray-light);
      font-size: 16px;
      position: relative;
      padding-bottom: 12px;
    }

    .stat-label::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 30px;
      height: 3px;
      background: var(--accent-gold);
    }

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

    .testimonial-card {
      background: var(--bg-card);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-gold);
    }

    .testimonial-text {
      font-style: italic;
      margin: 16px 0;
      color: var(--gray-dark);
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
      overflow: hidden;
    }

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

    .faq-item {
      border-bottom: 1px solid #e0e0e0;
      margin-bottom: 8px;
    }

    .faq-question {
      width: 100%;
      background: none;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      color: var(--black);
    }

    .faq-icon {
      font-size: 24px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--bg-faq);
      border-radius: 8px;
      padding: 0 20px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px;
      margin-bottom: 12px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 全宽 */
    .cta-full {
      background: var(--primary);
      padding: 100px 0;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .cta-full::before {
      content: "V";
      position: absolute;
      font-size: 300px;
      font-weight: 900;
      color: rgba(255,255,255,0.05);
      top: -40px;
      left: 50%;
      transform: translateX(-50%);
      font-family: var(--font-title);
    }

    .cta-full h2 {
      color: white;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 18px;
      margin-top: 24px;
    }

    .btn-white:hover {
      background: var(--black);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--black);
      color: var(--gray-light);
      padding: 60px 0 30px;
    }

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

    .footer-logo {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
    }

    .footer a:hover {
      color: var(--primary);
    }

    .copyright {
      border-top: 1px solid #333;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonials-grid { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 92%;
        border-radius: 32px;
        padding: 12px 20px;
      }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero {
        flex-direction: column;
        padding: 120px 0 60px;
        text-align: center;
      }
      .hero-buttons { justify-content: center; }
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
      .advantages-grid { grid-template-columns: 1fr; }
      .testimonials-grid { grid-template-columns: 1fr; overflow-x: auto; display: flex; gap: 16px; scroll-snap-type: x mandatory; }
      .testimonial-card { min-width: 280px; scroll-snap-align: start; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 520px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }