/* roulang page: index */
:root {
      --primary-red: #E43D2A;
      --deep-blue: #1A1A2E;
      --bg-light: #F8F9FA;
      --card-white: #FFFFFF;
      --accent-gold: #FFB800;
      --text-dark: #1A1A2E;
      --text-muted: #5A5A6E;
      --text-white: #FFFFFF;
      --success-green: #0FA958;
      --border-light: #E9ECEF;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.08);
      --transition: 0.25s ease;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --container-max: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

    h1, h2, h3 {
      font-weight: 600;
      line-height: 1.3;
    }

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

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.25rem;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      height: var(--nav-height);
    }

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

    .logo {
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--deep-blue);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--primary-red);
    }
    .logo i {
      font-size: 1.8rem;
      margin-right: 6px;
      color: var(--primary-red);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a.active {
      color: var(--primary-red);
      font-weight: 600;
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60%;
      height: 3px;
      background: var(--primary-red);
      border-radius: 3px;
    }
    .nav-links a:hover {
      color: var(--primary-red);
    }

    .btn-capsule {
      background: var(--primary-red);
      color: white;
      padding: 0.6rem 1.8rem;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      white-space: nowrap;
      border: none;
      display: inline-block;
    }
    .btn-capsule:hover {
      background: #C42A1A;
      color: white;
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(228, 61, 42, 0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 4px;
      cursor: pointer;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--deep-blue);
      display: block;
      border-radius: 2px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.5rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        gap: 1.5rem;
        display: none;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-container .btn-capsule {
        display: none;
      }
      .mobile-cta {
        display: block;
        margin-top: 1rem;
      }
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      color: white;
      background-blend-mode: overlay;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(0,0,0,0.2) 0%, rgba(26,26,46,0.85) 90%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 1.2rem;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .hero .subtitle {
      font-size: 1.2rem;
      font-weight: 300;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    .hero-btn {
      background: var(--primary-red);
      color: white;
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
      font-weight: 600;
      border-radius: 8px;
      display: inline-block;
      margin-bottom: 1rem;
    }
    .hero-btn:hover {
      background: #C42A1A;
      transform: scale(1.02);
    }
    .trust-text {
      font-size: 0.85rem;
      opacity: 0.8;
      margin-top: 0.5rem;
    }

    /* 通用section */
    section {
      padding: 5rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      color: var(--deep-blue);
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 指标看板 */
    #metrics {
      background: var(--deep-blue);
      color: white;
      padding: 4rem 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-item {
      border-right: 1px solid rgba(255,255,255,0.15);
      padding: 0 1rem;
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: -1px;
    }
    .metric-label {
      font-size: 0.9rem;
      opacity: 0.8;
      margin-top: 0.3rem;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem 1rem;
      }
      .metric-item {
        border-right: none;
      }
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 1.5rem;
      background: #f1f3f5;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--primary-red);
    }
    .service-card h3 {
      margin-bottom: 0.7rem;
    }
    .service-card p {
      color: var(--text-muted);
      flex: 1;
      margin-bottom: 1.2rem;
    }
    .text-link {
      color: var(--primary-red);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
    }
    .text-link i {
      margin-left: 4px;
      transition: 0.2s;
    }
    .text-link:hover i {
      transform: translateX(4px);
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }
    .compare-card.traditional {
      border-left: 4px solid #ccc;
    }
    .compare-card.letou {
      border-left: 4px solid var(--primary-red);
      background: #fff9f9;
    }
    .compare-card h3 {
      margin-bottom: 1.5rem;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      justify-content: space-between;
      padding: 0.7rem 0;
      border-bottom: 1px solid #eee;
    }
    .highlight-green {
      color: var(--success-green);
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--primary-red);
    }
    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单 */
    .contact-card {
      background: white;
      max-width: 600px;
      margin: 0 auto;
      padding: 2.5rem;
      border-radius: var(--radius-lg);
      box-shadow: 0 8px 30px rgba(0,0,0,0.06);
    }
    .form-group {
      margin-bottom: 1.2rem;
    }
    input, textarea {
      width: 100%;
      padding: 0.8rem;
      border: 1px solid #ddd;
      border-radius: 8px;
      font-family: inherit;
    }
    .btn-submit {
      background: var(--primary-red);
      color: white;
      width: 100%;
      padding: 0.9rem;
      font-weight: 600;
      border-radius: 8px;
    }

    footer {
      background: var(--deep-blue);
      color: #ccc;
      padding: 2.5rem 0 1.5rem;
    }