/* roulang page: index */
:root {
      --primary: #2B4C3B;
      --primary-deep: #1F3A2C;
      --accent: #E8A838;
      --bg-warm: #FAFAF7;
      --bg-dark: #1E1E1E;
      --text-main: #1A1A1A;
      --text-muted: #5C5C5C;
      --text-light: #8A8A8A;
      --border-soft: #E0E0D8;
      --card-shadow: 0 2px 16px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --max-width: 1280px;
      --header-height: 64px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button {
      background: none;
      border: none;
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航栏 - 杂志频道式 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(250, 250, 247, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: background 0.3s;
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--header-height);
      padding: 0 40px;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .social-icons {
      display: flex;
      gap: 18px;
      color: var(--text-muted);
    }
    .social-icons i {
      font-size: 18px;
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent);
    }

    .channel-row {
      display: flex;
      justify-content: center;
      gap: 0;
      background: rgba(250,250,247,0.8);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(0,0,0,0.02);
      height: 48px;
      align-items: center;
    }

    .channel-nav {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .channel-nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .channel-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .channel-nav a:hover,
    .channel-nav a.active {
      color: var(--accent);
    }
    .channel-nav a:hover::after,
    .channel-nav a.active::after {
      width: 100%;
    }
    .nav-divider {
      width: 1px;
      height: 18px;
      background: #ddd;
      display: inline-block;
    }

    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: var(--primary);
    }

    /* Hero 双栏杂志感 */
    .hero {
      display: flex;
      align-items: center;
      gap: 80px;
      padding: 60px 0 80px;
    }
    .hero-left {
      flex: 0 0 55%;
      animation: fadeInUp 0.8s ease-out;
    }
    .hero-title {
      font-family: var(--font-serif);
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 85%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition-smooth);
      letter-spacing: 0.4px;
      border: 1.5px solid transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 8px 18px rgba(43,76,59,0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(43,76,59,0.08);
      border-color: var(--primary-deep);
      color: var(--primary-deep);
    }
    .btn-accent {
      background: var(--accent);
      color: #1A1A1A;
      border-color: var(--accent);
    }
    .btn-accent:hover {
      background: #d4952b;
    }
    .btn-white-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
    }
    .btn-white-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
      animation: fadeInUp 0.8s ease-out 0.1s backwards;
    }
    .hero-image {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      border-left: 4px solid var(--accent);
    }
    .hero-data-badge {
      position: absolute;
      bottom: 24px;
      left: -20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 12px 24px;
      border-radius: 30px;
      box-shadow: 0 6px 18px rgba(0,0,0,0.06);
      font-weight: 600;
      color: var(--primary);
      font-size: 15px;
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-line {
      width: 48px;
      height: 3px;
      background: var(--accent);
      margin: 0 auto 16px;
      border-radius: 4px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 17px;
    }

    /* 亮点网格 2x3 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all var(--transition-smooth);
      border-bottom: 2px solid var(--accent);
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    .highlight-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 18px;
      transition: transform 0.2s;
    }
    .highlight-card:hover .highlight-icon {
      transform: rotate(5deg);
    }
    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .highlight-card p {
      color: var(--text-muted);
      font-size: 15px;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all var(--transition-smooth);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
      height: 200px;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      color: white;
      font-weight: 600;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-info {
      padding: 18px 16px;
    }
    .case-info h4 {
      font-weight: 600;
      margin-bottom: 6px;
    }
    .tag {
      display: inline-block;
      background: #f0f2f0;
      color: var(--primary);
      font-size: 13px;
      padding: 2px 10px;
      border-radius: 20px;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: white;
      border-radius: 16px;
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-soft);
      text-align: center;
      transition: all var(--transition-smooth);
    }
    .plan-card.recommended {
      background: #F0F5F2;
      border-color: var(--primary);
      position: relative;
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .plan-name {
      font-size: 22px;
      font-weight: 700;
      margin: 16px 0;
    }

    /* 数据带 */
    .data-strip {
      background: #F5F7F5;
      padding: 48px 0;
      overflow-x: auto;
      white-space: nowrap;
    }
    .data-items {
      display: flex;
      justify-content: space-around;
      gap: 32px;
    }
    .data-item {
      text-align: center;
    }
    .data-number {
      font-family: var(--font-mono);
      font-size: 48px;
      color: var(--accent);
      font-weight: 500;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #E8E8E0;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-weight: 600;
      font-size: 17px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #1E1E1E;
      padding: 80px 40px;
      text-align: center;
      border-radius: 24px;
      color: white;
    }
    .footer {
      background: #1A1A1A;
      color: #A0A0A0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero { flex-direction: column; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .hero-title { font-size: 36px; }
      .section-title { font-size: 28px; }
      .channel-row { display: none; }
      .mobile-menu-btn { display: block; }
      .highlights-grid, .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }