/* roulang page: index */
:root {
      --sand-warm: #C8B59B;
      --vermillion-red: #C43E2C;
      --blue-gray: #3A5068;
      --bg-warm-white: #FBF9F6;
      --card-white: #FFFFFF;
      --deep-text: #1E2A38;
      --soft-text: #6B7280;
      --success-green: #2D6A4F;
      --border-light: #D1D5DB;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 16px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --header-height: 64px;
      --max-width: 1280px;
      --section-gap: 80px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--deep-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      :root {
        --section-gap: 56px;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }
      :root {
        --section-gap: 48px;
      }
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--card-white);
      height: var(--header-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 1px 3px rgba(0,0,0,0.02);
    }

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

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-text);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }

    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--vermillion-red);
      border-radius: 50%;
      display: inline-block;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--blue-gray);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-menu a:hover {
      color: var(--vermillion-red);
      border-bottom-color: var(--vermillion-red);
    }

    .btn-primary {
      background: var(--vermillion-red);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: background 0.2s ease;
      font-size: 16px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: #A83322;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--blue-gray);
      color: var(--blue-gray);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all 0.2s ease;
      font-size: 16px;
    }

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

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--blue-gray);
      cursor: pointer;
      padding: 0 8px;
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .header .btn-primary {
        display: none;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--bg-warm-white);
      z-index: 100;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.25s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 20px;
      font-weight: 600;
      color: var(--deep-text);
    }

    .mobile-menu .close-btn {
      position: absolute;
      top: 20px;
      right: 24px;
      background: none;
      border: none;
      font-size: 32px;
      color: var(--deep-text);
      cursor: pointer;
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--deep-text);
      margin-bottom: 24px;
      letter-spacing: -0.3px;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.7rem;
      }
    }

    /* Hero */
    .hero {
      background: radial-gradient(circle at 20% 20%, rgba(200,181,155,0.15), transparent 60%);
      padding: 80px 0;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-text);
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.125rem;
      color: var(--soft-text);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .big-number {
      font-family: var(--font-number);
      font-size: 4rem;
      font-weight: 700;
      color: var(--vermillion-red);
      line-height: 1;
    }

    .small-label {
      font-size: 0.875rem;
      color: var(--soft-text);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-right {
        order: -1;
        margin-bottom: 24px;
      }
      .big-number {
        font-size: 3rem;
      }
    }

    /* 数据看板 */
    .stats-band {
      background: rgba(200,181,155,0.1);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-white);
      padding: 28px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 2rem;
      font-weight: 700;
      color: var(--vermillion-red);
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--soft-text);
    }

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

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-white);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      width: 48px;
      height: 48px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .service-desc {
      color: var(--soft-text);
      margin-bottom: 20px;
      flex: 1;
    }

    .text-link {
      color: var(--vermillion-red);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      text-decoration: underline;
    }

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

    /* 对比 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .comparison-col {
      padding: 32px;
      border-radius: var(--radius-card);
    }

    .col-bad {
      background: #F3F0EB;
    }

    .col-good {
      background: var(--card-white);
      border-left: 3px solid var(--vermillion-red);
    }

    .comparison-list {
      list-style: none;
      margin-top: 20px;
    }

    .comparison-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 1rem;
    }

    .icon-check {
      color: var(--success-green);
      font-weight: 700;
    }

    .icon-cross {
      color: #9CA3AF;
    }

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

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

    .faq-item {
      border-bottom: 1px solid #E5E7EB;
      padding: 20px 0;
    }

    .faq-question {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--deep-text);
      display: flex;
      align-items: baseline;
      gap: 12px;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 0;
    }

    .faq-bar {
      width: 2px;
      height: 20px;
      background: var(--sand-warm);
      flex-shrink: 0;
    }

    .faq-answer {
      font-size: 1rem;
      color: var(--soft-text);
      padding-top: 12px;
      padding-left: 20px;
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* 表单 */
    .cta-form {
      background: rgba(200,181,155,0.15);
    }

    .form-card {
      max-width: 640px;
      margin: 0 auto;
      background: var(--card-white);
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-weight: 500;
      margin-bottom: 8px;
      color: var(--deep-text);
    }

    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      font-size: 1rem;
      background: white;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .form-input:focus {
      outline: none;
      border-color: var(--vermillion-red);
      box-shadow: 0 0 0 3px rgba(196,62,44,0.1);
    }

    textarea.form-input {
      resize: vertical;
    }

    .btn-full {
      width: 100%;
    }

    /* 页脚 */
    .footer {
      background: #1E2A38;
      color: #9CA3AF;
      padding: 56px 0 32px;
    }

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

    .footer-logo {
      font-size: 1.25rem;
      font-weight: 700;
      color: white;
    }

    .footer a {
      color: #9CA3AF;
      display: block;
      margin-bottom: 8px;
    }

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

    .footer-bottom {
      margin-top: 40px;
      border-top: 1px solid #374151;
      padding-top: 24px;
      text-align: center;
      font-size: 0.875rem;
    }

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