/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-gold: #C9A96E;
      --bg-warm: #FAF8F5;
      --accent-red: #D44B3C;
      --text-dark: #1A1A2E;
      --text-mid: #4A4A5A;
      --text-light: #8A8A96;
      --text-muted: #C0C0C6;
      --border-warm: #E8E4DE;
      --bg-soft: #F0EDE8;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --shadow-card: 0 1px 3px rgba(26,26,46,0.06), 0 4px 12px rgba(26,26,46,0.04);
      --shadow-elevated: 0 8px 24px rgba(26,26,46,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-large: 12px;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --spacing-section: 100px;
      --max-width: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

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

    /* 导航 Header */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(250, 248, 245, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      border-bottom: 1px solid var(--border-warm);
    }

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

    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: var(--accent-gold);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><path d="M12 2a10 10 0 0 1 0 20"/></svg>') center/cover;
      background-color: var(--accent-gold);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--text-dark);
    }

    .nav-links a {
      position: relative;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      color: var(--text-dark);
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }

    .btn-primary {
      background: var(--accent-red);
      color: #fff;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      border: none;
    }
    .btn-primary:hover {
      background: #B83A2E;
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(212,75,60,0.25);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-deep);
      border: 1.5px solid var(--accent-gold);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(201,169,110,0.08);
      border-color: #b08a4a;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary-deep);
      color: var(--bg-warm);
      border-radius: 40px;
      padding: 8px 24px;
      gap: 20px;
      z-index: 1100;
      box-shadow: 0 8px 24px rgba(0,0,0,0.25);
      backdrop-filter: blur(8px);
    }
    .mobile-nav a {
      color: var(--text-muted);
      font-size: 0.75rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      transition: color 0.2s;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .header-inner {
        justify-content: center;
      }
      .logo {
        font-size: 1.6rem;
      }
    }

    /* Hero 双栏 */
    .hero {
      padding: 140px 0 80px;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-serif);
      font-size: 52px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--primary-deep);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-left .sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
      margin-bottom: 28px;
      flex-wrap: wrap;
    }
    .trust-badge {
      font-size: 0.9rem;
      color: var(--text-light);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .hero-right {
      position: relative;
    }
    .hero-img {
      border-radius: var(--radius-large);
      overflow: hidden;
      box-shadow: var(--shadow-elevated);
      position: relative;
    }
    .hero-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .hero-overlay-graphic {
      position: absolute;
      bottom: -12px;
      right: -12px;
      background: var(--accent-gold);
      color: #fff;
      width: 80px;
      height: 80px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.5rem;
      box-shadow: var(--shadow-card);
    }

    @media (max-width: 1023px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-left h1 {
        font-size: 40px;
      }
    }

    /* 板块通用 */
    .section {
      padding: var(--spacing-section) 0;
    }
    .section h2 {
      font-family: var(--font-serif);
      font-size: 34px;
      font-weight: 650;
      margin-bottom: 48px;
      color: var(--primary-deep);
    }

    /* 核心优势网格 2x3 非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 24px;
    }
    .feature-item {
      display: flex;
      gap: 20px;
      padding: 28px 0;
      border-bottom: 1px solid var(--border-warm);
      align-items: flex-start;
    }
    .feature-icon {
      font-size: 32px;
      color: var(--accent-gold);
      flex-shrink: 0;
    }
    .feature-text h3 {
      font-size: 1.3rem;
      font-weight: 650;
      margin-bottom: 8px;
    }
    .feature-text p {
      color: var(--text-mid);
      font-size: 0.95rem;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 2;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: #fff;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-elevated);
    }
    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .case-content {
      padding: 24px;
    }
    .case-content h3 {
      font-size: 1.2rem;
      margin-bottom: 10px;
    }

    @media (max-width: 768px) {
      .cases-masonry {
        columns: 1;
      }
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: #fff;
      border-radius: var(--radius-large);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }
    .compare-col {
      padding: 24px;
      border-radius: var(--radius-card);
    }
    .compare-left {
      border: 1.5px solid var(--accent-gold);
      background: #FDFAF5;
    }
    .compare-right {
      border: 1px solid var(--border-warm);
    }
    .badge {
      background: var(--accent-red);
      color: #fff;
      font-size: 0.7rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .compare-list {
      list-style: none;
      margin: 24px 0;
    }
    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据横幅 */
    .trust-banner {
      background: var(--bg-soft);
      padding: 48px 0;
      overflow: hidden;
    }
    .marquee {
      display: flex;
      gap: 60px;
      animation: marquee 20s linear infinite;
      white-space: nowrap;
    }
    @keyframes marquee {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }
    .stat-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-weight: 700;
    }
    .stat-number {
      font-size: 2rem;
      color: var(--accent-red);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-warm);
      padding: 20px 0;
      display: flex;
      gap: 24px;
      cursor: pointer;
    }
    .faq-num {
      font-size: 1.6rem;
      color: var(--accent-gold);
      opacity: 0.5;
      font-weight: 300;
    }
    .faq-content h3 {
      font-weight: 650;
      margin-bottom: 8px;
    }
    .faq-answer {
      display: none;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 转化区 */
    .cta-band {
      background: var(--primary-deep);
      padding: 64px 0;
      color: #fff;
    }
    .cta-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
    }
    .cta-inner h2 {
      color: #fff;
      margin-bottom: 0;
    }
    @media (max-width: 768px) {
      .cta-inner {
        flex-direction: column;
        text-align: center;
      }
    }

    /* Footer */
    .footer {
      background: var(--primary-deep);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: var(--accent-gold);
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }