/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-dark: #0F2622;
      --accent: #C59B5F;
      --accent-hover: #A87D4A;
      --gold: #D4AF37;
      --bg: #FAFAF7;
      --text: #1E1E1E;
      --text-secondary: #4A4A4A;
      --text-muted: #6B6B6B;
      --border: #E8E4DD;
      --white: #ffffff;
      --shadow-sm: 0 2px 12px rgba(26, 60, 52, 0.06);
      --shadow-hover: 0 8px 28px rgba(26, 60, 52, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
    }
    #header.scrolled {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 24px;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }
    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--accent), var(--gold));
      border-radius: 6px;
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-2 15l-5-5 1.41-1.41L10 14.17l7.59-7.59L19 8l-9 9z"/></svg>') center/contain no-repeat;
      background: var(--accent);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      color: var(--text);
      font-size: 15px;
    }
    .nav-links a {
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.25s, transform 0.25s;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      color: white !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--primary);
      padding: 80px 32px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.3s ease;
      z-index: 999;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section { padding: 64px 0; }
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      color: var(--primary);
      margin-bottom: 16px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .section-title { font-size: 28px; }
    }
    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      max-width: 640px;
      margin: 0 auto 48px;
      font-size: 16px;
    }
    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: var(--bg);
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-family: var(--font-serif);
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.25s, transform 0.25s;
      display: inline-block;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
      font-size: 16px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-container);
      height: 400px;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,60,52,0.1), rgba(197,155,95,0.15));
    }
    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 32px; }
      .hero-image { height: 280px; }
    }
    /* 卡片通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    @media (max-width: 1023px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
    }
    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .card:hover .card-img {
      transform: scale(1.04);
    }
    .card-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .card-body h3 {
      font-family: var(--font-serif);
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .card-body p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
    }
    .arrow-link {
      margin-top: auto;
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: color 0.2s;
    }
    .arrow-link:hover { color: var(--accent); }
    /* 数据信任深色块 */
    #trust {
      background: var(--primary-dark);
      color: white;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 32px;
    }
    .trust-item .number {
      font-size: 56px;
      font-weight: 700;
      color: var(--gold);
      line-height: 1.2;
    }
    .trust-item .label {
      font-size: 14px;
      opacity: 0.8;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .trust-grid { grid-template-columns: 1fr 1fr; }
      .trust-item .number { font-size: 40px; }
    }
    /* 解决方案图文交替 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .solution-img {
      background: #e0dbd2;
      border-radius: var(--radius-card);
      height: 320px;
      background-size: cover;
      background-position: center;
    }
    .solution-content h3 {
      font-family: var(--font-serif);
      font-size: 26px;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .solution-row { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA */
    #cta {
      background: var(--primary);
      text-align: center;
      color: white;
    }
    #cta .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: 0.25s;
      display: inline-block;
    }
    #cta .btn-accent:hover { background: var(--accent-hover); }
    footer {
      background: var(--primary-dark);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }