/* roulang page: index */
:root {
      --primary: #4A5C6C;
      --primary-hover: #3A4A5A;
      --primary-soft: rgba(74, 92, 108, 0.1);
      --accent: #C8A96E;
      --accent-soft: rgba(200, 169, 110, 0.15);
      --bg: #F7F5F2;
      --white: #FFFFFF;
      --text: #2B2B2B;
      --text-light: #5F6B7A;
      --border: #E2DFDA;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 标题字体全局设定 */
    h1, h2, h3, .font-title {
      font-family: var(--font-title);
      font-weight: 600;
    }
    h2 {
      font-size: 24px;
      letter-spacing: -0.2px;
    }
    h3 {
      font-size: 18px;
      letter-spacing: -0.1px;
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
      h2 {
        font-size: 20px;
      }
    }
    /* 导航栏固定顶部 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background-color: var(--bg);
      border-bottom: 1px solid var(--border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 24px;
      height: 24px;
      background-color: var(--accent);
      display: inline-block;
      border-radius: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      transition: transform 0.25s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-family: var(--font-body);
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.15);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-soft);
    }
    .status-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      background-color: #E6F4EA;
      color: #1E7B3C;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #1E7B3C;
      border-radius: 50%;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links, .nav-cta-group .btn-primary {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-cta-group .status-badge {
        display: none;
      }
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background-color: var(--bg);
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.open {
      transform: translateY(0);
    }
    .mobile-link {
      font-size: 20px;
      font-weight: 600;
      color: var(--text);
    }
    /* Hero 双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 55% 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.25;
      color: var(--text);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 28px;
    }
    .trust-row {
      display: flex;
      gap: 32px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .trust-item .trust-num {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--accent);
      display: block;
    }
    .trust-item .trust-label {
      font-size: 14px;
      color: var(--text-light);
    }
    .hero-right img {
      width: 100%;
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-md);
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-left h1 {
        font-size: 2rem;
      }
    }
    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .card-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .card h3 {
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .card-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布流 */
    .case-waterfall {
      display: flex;
      gap: 28px;
    }
    .case-left {
      width: 58%;
    }
    .case-right {
      width: 38%;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 40%;
      background: linear-gradient(to top, rgba(0,0,0,0.3), transparent);
    }
    .case-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      z-index: 2;
    }
    .case-body {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .case-waterfall {
        flex-direction: column;
      }
      .case-left, .case-right {
        width: 100%;
      }
    }
    /* 对比表 */
    .compare-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .compare-col {
      padding: 36px 28px;
    }
    .compare-left {
      background: #F0EDE8;
    }
    .compare-right {
      background: var(--primary-soft);
    }
    .compare-title {
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .compare-panel {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 3px solid var(--primary);
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-light);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* 表单 */
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-family: var(--font-body);
      margin-bottom: 16px;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary);
      outline: none;
    }
    /* 页脚 */
    .footer {
      background-color: var(--primary);
      color: rgba(255,255,255,0.9);
      padding: 48px 0 24px;
    }
    .footer a {
      color: rgba(255,255,255,0.75);
    }
    .footer a:hover {
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .underline-decoration {
      width: 48px;
      height: 3px;
      background-color: var(--accent);
      margin-bottom: 24px;
    }