/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-hover: #15546B;
      --accent: #F5A623;
      --accent-light: #FFF3E0;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text: #1E293B;
      --text-light: #64748B;
      --text-lighter: #94A3B8;
      --border: #E9ECEF;
      --success: #2D6A4F;
      --shadow-xs: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(26,95,122,0.12);
      --radius-card: 1rem;
      --radius-btn: 0.5rem;
      --radius-tag: 0.5rem;
      --font-heading: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Inter", "SF Pro Display", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      --transition-base: 0.2s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-body);
      color: var(--text);
      background-color: var(--bg);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: white;
      border-bottom: 1px solid var(--border);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      backdrop-filter: blur(8px);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: 1px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 2px;
    }
    .logo-text span {
      color: var(--accent);
      font-size: 1.5rem;
      margin-top: 3px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }
    .nav-link {
      text-decoration: none;
      color: var(--text-light);
      font-weight: 500;
      font-size: 1rem;
      padding: 0.5rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-nav {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.6rem 1.5rem;
      border-radius: 4rem;
      font-weight: 600;
      transition: var(--transition-base);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
    }
    .btn-nav:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text);
      display: block;
      transition: 0.3s;
    }

    /* 通用版块 */
    .section-padding {
      padding: 5rem 0;
    }
    .h2-title {
      font-family: var(--font-heading);
      font-size: 2.3rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 2.5rem;
      letter-spacing: -0.3px;
      line-height: 1.35;
    }
    .h3-title {
      font-family: var(--font-heading);
      font-size: 1.3rem;
      font-weight: 600;
      margin: 0.8rem 0 0.4rem;
    }

    /* Hero杂志分栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-heading);
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--text);
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 0.9rem 2rem;
      border-radius: 4rem;
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s ease;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(26,95,122,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.9rem 2rem;
      border-radius: 4rem;
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(26,95,122,0.08);
    }
    .hero-right {
      width: 100%;
      border-radius: 1.2rem;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      background: linear-gradient(135deg, rgba(26,95,122,0.1), rgba(245,166,35,0.1));
    }
    .hero-right img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    /* 亮点网格 */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .highlight-card {
      background: var(--card-bg);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-xs);
      border: 1px solid var(--border);
      transition: var(--transition-base);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 0.8rem;
    }

    /* 案例瀑布 */
    .masonry {
      columns: 3;
      column-gap: 1.4rem;
    }
    .masonry-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-xs);
      overflow: hidden;
      break-inside: avoid;
      margin-bottom: 1.4rem;
      transition: 0.2s;
      border: 1px solid var(--border);
    }
    .masonry-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .masonry-img {
      width: 100%;
      display: block;
    }
    .masonry-body {
      padding: 1.2rem;
    }
    .tag {
      background: var(--accent);
      color: white;
      padding: 0.15rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.5rem;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      border-radius: 1rem;
      overflow: hidden;
      box-shadow: var(--shadow-xs);
      border: 1px solid var(--border);
    }
    .compare-col {
      padding: 2.2rem;
      background: #F1F3F5;
    }
    .compare-col.right {
      background: white;
      border-left: 2px dashed var(--primary);
    }
    .compare-item {
      padding: 0.8rem 0;
      border-bottom: 1px solid var(--border);
    }

    /* FAQ 双栏 */
    .faq-wrapper {
      display: grid;
      grid-template-columns: 240px 1fr;
      gap: 2rem;
    }
    .faq-tabs button {
      display: block;
      background: none;
      border: none;
      font-size: 1rem;
      padding: 0.8rem 1rem;
      text-align: left;
      width: 100%;
      color: var(--text-light);
      border-radius: 0.5rem;
    }
    .faq-tabs button.active {
      background: rgba(26,95,122,0.08);
      color: var(--primary);
      font-weight: 600;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border);
    }
    .accordion-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-weight: 600;
      padding: 1rem 0;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* 联系CTA */
    .cta-section {
      background: linear-gradient(180deg, #F8F9FA 0%, #E9ECEF 100%);
      border-radius: 2rem;
      margin: 4rem auto;
    }
    .form-row {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .form-input {
      flex: 1;
      height: 50px;
      border-radius: 0.6rem;
      border: 1px solid #ced4da;
      padding: 0 1rem;
      font-size: 1rem;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.4fr;
      gap: 2.5rem;
      padding: 3.5rem 0 2rem;
    }
    .tag-cloud span {
      background: #334155;
      color: #CBD5E1;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { gap: 2rem; }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu { display: none; position: absolute; top: 72px; left:0; width:100%; background:white; flex-direction: column; padding:2rem; }
      .nav-menu.open { display: flex; }
      .hero-grid, .grid-3col, .faq-wrapper, .compare-grid { grid-template-columns: 1fr; }
      .masonry { columns:2; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 2.2rem !important; }
    }
    @media (max-width: 480px) {
      .container { padding: 0 1.2rem; }
      .masonry { columns:1; }
      .btn-group { flex-direction: column; }
    }