/* roulang page: index */
:root {
      --primary-red: #C8102E;
      --primary-red-hover: #A00D24;
      --primary-red-light: rgba(200, 16, 46, 0.08);
      --deep-black: #1C1C1C;
      --warm-white: #F5F0EB;
      --pure-white: #FFFFFF;
      --accent-gold: #D4AF37;
      --accent-gold-hover: #C09A2E;
      --text-body: #2D2D2D;
      --text-muted: #6B6B6B;
      --border-light: #E0DCD7;
      --card-shadow: 0 4px 20px rgba(28, 28, 28, 0.06);
      --card-shadow-hover: 0 8px 30px rgba(200, 16, 46, 0.12);
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-input: 6px;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-data: 'Inter', system-ui, sans-serif;
      --section-padding-y: 90px;
      --nav-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-serif);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--warm-white);
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, .nav-link, .btn, .data-number, .footer-title {
      font-family: var(--font-sans);
    }
    
    h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep-black);
    }
    
    h2 {
      font-size: clamp(2rem, 4.5vw, 2.5rem);
      font-weight: 700;
      line-height: 1.3;
      color: var(--deep-black);
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }
    
    h3 {
      font-size: 1.375rem;
      font-weight: 500;
      line-height: 1.4;
      color: var(--deep-black);
    }
    
    .section-subtitle {
      font-family: var(--font-sans);
      font-size: 1.125rem;
      color: var(--text-muted);
      margin-bottom: 2.5rem;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-sans);
      font-weight: 500;
      font-size: 1rem;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-button);
      transition: all 0.25s ease;
      border: 1.5px solid transparent;
      cursor: pointer;
      white-space: nowrap;
    }
    
    .btn-primary {
      background-color: var(--primary-red);
      color: var(--pure-white);
      border-color: var(--primary-red);
    }
    
    .btn-primary:hover {
      background-color: var(--primary-red-hover);
      border-color: var(--primary-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(200, 16, 46, 0.3);
    }
    
    .btn-outline {
      background: transparent;
      border-color: var(--primary-red);
      color: var(--primary-red);
    }
    
    .btn-outline:hover {
      background-color: var(--primary-red-light);
      transform: translateY(-2px);
    }
    
    .btn-gold {
      background-color: var(--accent-gold);
      color: var(--deep-black);
      border-color: var(--accent-gold);
      font-weight: 600;
    }
    
    .btn-gold:hover {
      background-color: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(212, 175, 55, 0.4);
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--pure-white);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s, box-shadow 0.3s;
    }
    
    .navbar.scrolled {
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      display: flex;
      flex-direction: column;
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-red);
      line-height: 1.2;
    }
    
    .logo small {
      font-size: 0.625rem;
      font-weight: 400;
      letter-spacing: 2px;
      color: var(--text-muted);
      text-transform: uppercase;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.2s ease;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    .nav-cta {
      margin-left: 0.5rem;
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-black);
      transition: 0.2s;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--pure-white);
      z-index: 99;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      font-size: 1.5rem;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s, visibility 0.3s;
    }
    
    .mobile-menu.active {
      opacity: 1;
      visibility: visible;
    }
    
    /* Hero 双栏杂志布局 */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      background-color: var(--warm-white);
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 4fr;
      gap: 3rem;
      align-items: center;
    }
    
    .hero-left h1 {
      margin-bottom: 1.5rem;
    }
    
    .hero-subtitle {
      font-family: var(--font-sans);
      font-size: 1.125rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    .hero-right {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      height: 480px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: flex-end;
      justify-content: center;
    }
    
    .glass-card {
      background: rgba(28, 28, 28, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 12px;
      padding: 1.5rem 2rem;
      margin: 1.5rem;
      color: white;
      display: flex;
      gap: 2rem;
      border: 1px solid rgba(255,255,255,0.2);
    }
    
    .glass-stat h4 {
      font-family: var(--font-data);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    .glass-stat p {
      font-size: 0.8rem;
      opacity: 0.85;
    }
    
    /* 板块通用 */
    section {
      padding: var(--section-padding-y) 0;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    
    /* 核心亮点 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    
    .highlight-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--primary-red);
      display: flex;
      flex-direction: column;
      transition: box-shadow 0.25s;
    }
    
    .highlight-card:hover {
      box-shadow: var(--card-shadow-hover);
    }
    
    .highlight-number {
      font-family: var(--font-data);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      margin-top: auto;
      padding-top: 1rem;
    }
    
    /* 案例瀑布 */
    .cases-masonry {
      columns: 3;
      column-gap: 1.8rem;
    }
    
    .case-card {
      break-inside: avoid;
      background: var(--pure-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      margin-bottom: 1.8rem;
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    
    .case-card:hover {
      border-color: var(--primary-red);
      box-shadow: var(--card-shadow-hover);
    }
    
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.4s;
    }
    
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    
    .case-content {
      padding: 1.5rem;
    }
    
    .case-tags {
      display: flex;
      gap: 0.5rem;
      margin-top: 0.8rem;
    }
    
    .tag {
      background: rgba(200,16,46,0.08);
      color: var(--primary-red);
      font-family: var(--font-sans);
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
    }
    
    /* 对比表 */
    .compare-table-wrapper {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
    }
    
    .compare-table {
      width: 100%;
      min-width: 700px;
      border-collapse: collapse;
      background: var(--pure-white);
    }
    
    .compare-table th {
      background: var(--deep-black);
      color: white;
      padding: 1.2rem 1rem;
      font-family: var(--font-sans);
      font-weight: 600;
      text-align: center;
    }
    
    .compare-table td {
      padding: 1rem;
      text-align: center;
      border-bottom: 1px solid var(--border-light);
    }
    
    .gold-crown {
      color: var(--accent-gold);
      margin-left: 6px;
    }
    
    /* 信任条 */
    .trust-band {
      background: var(--deep-black);
      color: white;
    }
    
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }
    
    .trust-item .data-number {
      font-family: var(--font-data);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-left: 4px solid var(--primary-red);
      margin-bottom: 1rem;
      background: #FAF9F7;
      border-radius: 0 8px 8px 0;
      transition: border-color 0.3s;
    }
    
    .faq-item.open {
      border-left-color: var(--accent-gold);
    }
    
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-family: var(--font-sans);
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 1.5rem;
    }
    
    .faq-item.open .faq-answer {
      max-height: 150px;
      padding-bottom: 1.2rem;
    }
    
    /* CTA Banner */
    .cta-banner {
      background: var(--deep-black);
      text-align: center;
      padding: 5rem 0;
    }
    
    .cta-banner h2 {
      color: white;
    }
    
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    
    .footer-brand p {
      color: var(--text-muted);
      margin-top: 0.8rem;
      font-size: 0.9rem;
    }
    
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
      font-size: 0.9rem;
    }
    
    .copyright {
      border-top: 1px solid var(--border-light);
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.8rem;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr 1fr; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-right { height: 300px; }
      .highlights-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .trust-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .btn { width: 100%; justify-content: center; }
      .hero-buttons .btn { width: auto; }
    }
    
    @media (max-width: 520px) {
      .container { padding: 0 1.2rem; }
      .trust-grid { grid-template-columns: 1fr; }
    }