/* roulang page: index */
:root {
      --primary: #1E2A38;
      --primary-hover: #111820;
      --accent: #C49A6C;
      --accent-light: rgba(196, 154, 108, 0.08);
      --bg-warm: #FAF9F7;
      --text-primary: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-tertiary: #8C8C8C;
      --border-light: #E8E5E1;
      --border-input: #D1CCC5;
      --white: #FFFFFF;
      --footer-bg: #1E2A38;
      --footer-text: #B0B8C1;
      --footer-heading: #FFFFFF;
      --footer-dark: #151D26;
      --radius-none: 0px;
      --radius-sm: 2px;
      --shadow-xs: 0 1px 3px rgba(0,0,0,0.04);
      --font-heading: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', sans-serif;
      --max-width: 1280px;
      --spacing-lg: 100px;
      --spacing-md: 60px;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 1.5em;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border: none;
      transition: all var(--transition);
      text-transform: uppercase;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border: 1px solid var(--primary);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
    }
    .btn-outline:hover {
      background-color: var(--accent-light);
    }
    .section {
      padding: var(--spacing-lg) 0;
    }
    .bg-warm {
      background-color: var(--bg-warm);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: box-shadow var(--transition);
    }
    .navbar.scrolled {
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo small {
      font-size: 12px;
      font-weight: 400;
      color: var(--text-tertiary);
      margin-left: 6px;
      letter-spacing: 0;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      color: var(--text-secondary);
      font-weight: 500;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      font-size: 13px;
      border: none;
      font-weight: 600;
      height: 36px;
      border-radius: var(--radius-sm);
    }
    .btn-nav:hover {
      background: var(--primary-hover);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }
    /* Hero 分屏 */
    .hero-grid {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 56px;
    }
    .hero-left {
      width: 50%;
      padding-right: 48px;
    }
    .hero-right {
      width: 50%;
      height: 600px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(250,249,247,0.25);
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 24px 0 16px;
      font-weight: 400;
    }
    .hero-pain {
      font-size: 14px;
      color: var(--text-tertiary);
      margin-bottom: 32px;
      max-width: 80%;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 亮点网格 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: var(--white);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      transition: border-color var(--transition);
    }
    .highlight-card:hover {
      border-color: var(--accent);
    }
    .highlight-icon {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .highlight-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .highlight-desc {
      font-size: 14px;
      color: var(--text-tertiary);
      line-height: 1.7;
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .case-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all var(--transition);
    }
    .case-card:hover {
      border-color: var(--accent);
    }
    .case-img {
      height: 220px;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px 16px;
      border-top: 1px solid var(--border-light);
    }
    .case-tag {
      display: inline-block;
      font-size: 11px;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 2px 10px;
      margin-bottom: 12px;
      font-weight: 600;
    }
    .case-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-result {
      font-size: 14px;
      color: var(--text-secondary);
    }
    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 0;
      border: 1px solid var(--border-light);
      background: var(--white);
    }
    .compare-col {
      flex: 1;
      padding: 40px 32px;
    }
    .compare-col.left {
      background: #F9F8F6;
    }
    .compare-col.right {
      background: var(--white);
      border-left: 1px solid var(--border-light);
    }
    .compare-heading {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 28px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .right .compare-heading {
      color: var(--primary);
    }
    .compare-item {
      display: flex;
      gap: 12px;
      margin-bottom: 24px;
      font-size: 16px;
      color: var(--text-secondary);
    }
    .icon-check {
      color: var(--accent);
      font-weight: bold;
    }
    .icon-cross {
      color: #C0BDB8;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      text-align: left;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease, padding 0.25s ease;
      color: var(--text-secondary);
      line-height: 1.8;
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--text-tertiary);
    }
    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }
    .form-group {
      margin-bottom: 20px;
    }
    label {
      font-size: 13px;
      color: var(--text-secondary);
      display: block;
      margin-bottom: 6px;
      font-weight: 500;
    }
    input, textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-input);
      font-family: var(--font-body);
      font-size: 15px;
      background: white;
      border-radius: var(--radius-sm);
      transition: border var(--transition);
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary);
    }
    .contact-info p {
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }
    .footer h4 {
      color: var(--footer-heading);
      font-size: 14px;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer a {
      color: var(--footer-text);
      font-size: 14px;
      display: block;
      margin-bottom: 12px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 48px;
      padding: 24px 0;
      background: var(--footer-dark);
      text-align: center;
      font-size: 13px;
      color: #8A94A0;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .container { padding: 0 20px; }
      .nav-links, .nav-actions .btn-nav { display: none; }
      .hamburger { display: block; }
      .hero-grid {
        flex-direction: column;
        min-height: auto;
      }
      .hero-left, .hero-right {
        width: 100%;
        padding-right: 0;
      }
      .hero-right {
        height: 280px;
        margin-top: 32px;
      }
      .grid-4 { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .compare-row { flex-direction: column; }
      .compare-col.right { border-left: none; border-top: 1px solid var(--border-light); }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }