/* roulang page: index */
:root {
      --primary-deep: #0A0E17;
      --accent-gold: #D4AF37;
      --accent-gold-hover: #B8962E;
      --bg-warm: #F5F3EF;
      --surface-white: #FFFFFF;
      --text-primary: #2C2C2C;
      --text-secondary: #6B6B6B;
      --text-on-dark: #FFFFFF;
      --text-muted-on-dark: #B0B0B0;
      --border-light: rgba(0,0,0,0.06);
      --success-green: #1A7A4C;
      --danger-red: #C0392B;
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-pill: 40px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 2px 6px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--surface-white);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition-smooth);
    }
    .main-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.3px;
      color: var(--primary-deep);
      text-decoration: none;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo .year-badge {
      font-size: 16px;
      font-weight: 500;
      color: var(--accent-gold);
      margin-left: 2px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      font-size: 16px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-gold);
    }
    .cta-pill {
      background: var(--accent-gold);
      color: var(--primary-deep) !important;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
      display: inline-block;
      white-space: nowrap;
    }
    .cta-pill:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.2s;
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--surface-white);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        display: none;
        z-index: 99;
      }
      .mobile-menu.open {
        display: flex;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-size: 40px;
      font-weight: 600;
      letter-spacing: -0.01em;
      line-height: 1.25;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary-deep);
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 40px;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding-top: 120px;
      background: var(--surface-white);
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 16px 32px;
      border-radius: var(--radius-button);
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      font-weight: 600;
      padding: 16px 32px;
      border-radius: var(--radius-button);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(212, 175, 55, 0.08);
    }
    .hero-image {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }
    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 40px;
      }
    }
    /* 亮点网格 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }
    .stat-card {
      background: var(--surface-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .icon-gold {
      color: var(--accent-gold);
      font-size: 32px;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .grid-3x2 {
        grid-template-columns: 1fr;
      }
    }
    /* 服务流 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 20px;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      background: var(--accent-gold);
      color: var(--primary-deep);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 12px;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
      }
    }
    /* 案例瀑布 */
    .waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--surface-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-card img {
      width: 100%;
      display: block;
      transition: transform 0.35s;
    }
    .case-card:hover img {
      transform: scale(1.04);
    }
    @media (max-width: 768px) {
      .waterfall {
        grid-template-columns: 1fr;
      }
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 24px;
      margin-top: 30px;
    }
    .compare-col {
      flex: 1;
      background: var(--surface-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.highlight {
      border: 2px solid var(--accent-gold);
    }
    @media (max-width: 768px) {
      .compare-table {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 80px 20px;
    }
    .footer {
      background: var(--primary-deep);
      color: var(--text-muted-on-dark);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }