/* roulang page: index */
:root {
      --primary-deep: #0B1E3F;
      --accent-gold: #F5A623;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --text-dark: #1E2A3A;
      --text-mid: #5F6B7A;
      --text-light: #8B95A5;
      --border-light: #E0E6ED;
      --error-red: #D94A4A;
      --success-gold: #F5A623;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(11,30,63,0.06);
      --shadow-hover: 0 8px 30px rgba(11,30,63,0.12);
      --transition: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--card-white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      letter-spacing: 0.02em;
    }
    .logo small {
      font-size: 0.75rem;
      font-weight: 400;
      color: var(--text-mid);
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.2s ease, left 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      letter-spacing: 0.03em;
      box-shadow: 0 2px 8px rgba(245,166,35,0.3);
    }
    .btn-primary:hover {
      background: #E09515;
      box-shadow: 0 4px 12px rgba(224,149,21,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: #F0F4FA;
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary-deep);
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      text-align: center;
      color: var(--primary-deep);
    }
    /* Hero 双栏 */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
    }
    .hero-right img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(11,30,63,0.15);
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: 0.02em;
      color: var(--primary-deep);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-mid);
      margin: 1.2rem 0 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 2rem;
    }
    .trust-badges {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 600;
      color: var(--primary-deep);
    }
    .trust-item i {
      color: var(--accent-gold);
      font-size: 1.3rem;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .highlight-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .highlight-icon {
      font-size: 2.4rem;
      color: var(--accent-gold);
      margin-bottom: 1.2rem;
    }
    .highlight-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.8rem;
    }
    /* 案例瀑布流 */
    .masonry {
      columns: 2;
      column-gap: 2rem;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 2rem;
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }
    .case-card img {
      width: 100%;
      height: auto;
      transition: transform 0.3s ease;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 1.2rem 1.5rem;
    }
    .case-tag {
      background: #FEF0D5;
      color: #B26B0E;
      font-size: 0.8rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }
    .case-info h4 {
      font-size: 1.2rem;
      margin-bottom: 0.4rem;
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      flex: 1 1 250px;
      max-width: 320px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .plan-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .plan-badge {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      align-self: flex-start;
      margin-bottom: 1rem;
    }
    .plan-feature {
      display: flex;
      justify-content: space-between;
      padding: 0.7rem 0;
      border-bottom: 1px solid var(--border-light);
    }
    .check { color: var(--accent-gold); font-weight: bold; }
    .cross { color: var(--error-red); }
    .plan-cta {
      margin-top: auto;
      padding-top: 1.5rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #F4F6FA;
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      font-weight: 600;
      font-size: 1.1rem;
      background: transparent;
      text-align: left;
      color: var(--primary-deep);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: white;
      padding: 0 20px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: var(--text-mid);
    }
    .faq-item.active {
      background: white;
      box-shadow: var(--shadow-sm);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* 联系区块 */
    .contact-wrapper {
      display: flex;
      gap: 2.5rem;
      background: var(--primary-deep);
      border-radius: 24px;
      padding: 3rem;
      color: white;
    }
    .contact-form {
      flex: 1 1 60%;
      background: white;
      border-radius: 16px;
      padding: 2rem;
      color: var(--text-dark);
    }
    .contact-info {
      flex: 1 1 40%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .form-group {
      margin-bottom: 1.2rem;
    }
    input, textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      font-family: inherit;
    }
    /* 页脚 */
    footer {
      background: var(--primary-deep);
      color: #E0E6ED;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
      color: #9AA4B2;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .highlights-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .contact-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2rem; }
    }