/* roulang page: index */
:root {
      --primary: #B8860B;
      --primary-dark: #9A6D0A;
      --secondary: #8B3A3A;
      --secondary-dark: #6E2E2E;
      --bg-warm: #FAF7F2;
      --text-dark: #2C2416;
      --text-soft: #5C5348;
      --card-bg: #FFFFFF;
      --border-sand: #E8DCC8;
      --shadow-sm: 0 4px 20px rgba(44, 36, 22, 0.06);
      --shadow-hover: 0 8px 30px rgba(44, 36, 22, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Segoe UI', sans-serif;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    ::selection {
      background: var(--primary);
      color: white;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 60px 0;
      }
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-dark);
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      line-height: 1.3;
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
      text-align: center;
      width: 100%;
    }
    h2::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--primary);
      margin: 12px auto 0;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
    }
    input, button {
      font-family: var(--font-body);
    }
    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-sand);
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 20px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.02em;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      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 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.05em;
      transition: var(--transition);
      display: inline-block;
      font-size: 0.95rem;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.05em;
      transition: var(--transition);
      display: inline-block;
      font-size: 0.95rem;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .badge {
      background: var(--secondary);
      color: white;
      font-size: 0.7rem;
      padding: 3px 8px;
      border-radius: 20px;
      font-weight: 600;
      letter-spacing: 0.04em;
      margin-left: 6px;
      vertical-align: middle;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--text-dark);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 16px;
      }
    }
    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-links, .nav-cta {
        display: none;
      }
      .navbar .container {
        flex-wrap: wrap;
      }
      .nav-mobile {
        display: flex;
        flex-direction: column;
        width: 100%;
        background: white;
        padding: 20px;
        border-top: 1px solid var(--border-sand);
      }
      .nav-mobile a {
        padding: 10px 0;
        font-size: 1.1rem;
      }
    }
    /* Hero */
    #hero {
      padding: 0;
      background: var(--bg-warm);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      min-height: 100vh;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-text h1 {
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 30px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 16px;
      min-height: 400px;
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        min-height: auto;
        padding: 60px 0;
      }
      .hero-image {
        width: 100%;
        min-height: 280px;
        order: -1;
        margin-bottom: 24px;
      }
      h1 {
        font-size: 2rem;
      }
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .highlight-card {
      background: var(--card-bg);
      padding: 36px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 80px;
      height: 80px;
      background: #F0EBE0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 2rem;
      color: var(--primary);
      transition: 0.2s;
    }
    .highlight-card:hover .icon-circle {
      background: #e4d5b0;
    }
    @media (max-width: 1024px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
      margin-top: 30px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      overflow: hidden;
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: #F0EBE0;
      color: var(--secondary);
      font-size: 0.8rem;
      padding: 3px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 8px;
    }
    @media (max-width: 1024px) {
      .cases-masonry {
        columns: 2;
      }
    }
    @media (max-width: 640px) {
      .cases-masonry {
        columns: 1;
      }
    }
    /* 方案对比 */
    .plan-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .plan-card {
      background: var(--card-bg);
      border: 1px solid var(--border-sand);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      position: relative;
      transition: var(--transition);
    }
    .plan-card.featured {
      border: 2px solid var(--primary);
    }
    .plan-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--secondary);
      color: white;
      font-size: 0.75rem;
      padding: 4px 14px;
      border-radius: 20px;
      font-weight: 600;
    }
    .plan-name {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .plan-price {
      color: var(--primary);
      font-size: 2rem;
      font-weight: 700;
      margin: 12px 0;
    }
    .plan-features {
      list-style: none;
      margin: 20px 0;
    }
    .plan-features li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .plan-features i.fa-check {
      color: var(--primary);
    }
    .plan-features i.fa-times {
      color: #aaa;
    }
    @media (max-width: 1024px) {
      .plan-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .plan-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-sand);
    }
    .accordion-btn {
      width: 100%;
      text-align: left;
      padding: 18px 0;
      background: transparent;
      border: none;
      font-weight: 600;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
      transition: color 0.2s;
    }
    .accordion-btn:hover {
      color: var(--primary);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-soft);
    }
    .accordion-content p {
      padding-bottom: 18px;
    }
    .accordion-btn i {
      transition: transform 0.3s;
    }
    .active-accordion i {
      transform: rotate(45deg);
      color: var(--primary);
    }
    /* CTA */
    #contact {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }
    #contact::before {
      content: '';
      position: absolute;
      inset: 0;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="%23ffffff" opacity="0.04"><polygon points="50,5 95,30 95,70 50,95 5,70 5,30"/></svg>');
      background-size: 60px;
    }
    .cta-content {
      position: relative;
      color: white;
      text-align: center;
    }
    .cta-content h2 {
      color: white;
    }
    .cta-content h2::after {
      background: white;
      margin-top: 10px;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin-top: 30px;
      flex-wrap: wrap;
    }
    .cta-form input {
      padding: 14px 18px;
      border-radius: var(--radius-input);
      border: none;
      background: white;
      min-width: 220px;
    }
    .btn-secondary {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: var(--secondary-dark);
    }
    /* 页脚 */
    .footer {
      background: #2C2416;
      color: #C4B8A8;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
    }
    .footer a {
      color: #C4B8A8;
    }
    .footer a:hover {
      color: white;
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 12px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 500px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }