/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-deep: #2D1B3D;
      --primary-gradient: linear-gradient(135deg, #2D1B3D 0%, #4A2C5A 100%);
      --accent-gold: #D4AF37;
      --accent-gold-light: #C29B2E;
      --bg-warm: #FBF7F2;
      --bg-light-gray: #F5F2ED;
      --text-dark: #1E1E1E;
      --text-muted: #5A5A5A;
      --text-light: #CBC3D1;
      --white: #FFFFFF;
      --border-light: #E8E3DA;
      --shadow-card: 0 4px 20px rgba(45, 27, 61, 0.06);
      --shadow-card-hover: 0 8px 30px rgba(45, 27, 61, 0.12);
      --shadow-nav: 0 8px 30px rgba(0, 0, 0, 0.04);
      --border-radius-card: 16px;
      --border-radius-btn: 12px;
      --radius-badge: 20px;
      --transition-base: 0.3s ease;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', sans-serif;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(40px, 6vw, 60px);
    }

    h2 {
      font-size: clamp(32px, 5vw, 42px);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 22px;
      margin-bottom: 0.5rem;
    }

    p {
      color: var(--text-muted);
      font-size: 1.05rem;
      margin-bottom: 1rem;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.3px;
      transition: all var(--transition-base);
      cursor: pointer;
      border: none;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: var(--white);
      box-shadow: 0 4px 15px rgba(45, 27, 61, 0.2);
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 20px rgba(212, 175, 55, 0.4);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
    }

    .btn-outline:hover {
      background: rgba(212, 175, 55, 0.08);
      border-color: var(--accent-gold-light);
      color: var(--accent-gold-light);
    }

    .btn-white {
      background: var(--white);
      color: var(--primary-deep);
      box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    }
    .btn-white:hover {
      background: #f0ebe4;
      box-shadow: 0 10px 25px rgba(0,0,0,0.12);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(251, 247, 242, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(45, 27, 61, 0.08);
      z-index: 100;
      transition: box-shadow var(--transition-base);
    }

    .header.scrolled {
      box-shadow: var(--shadow-nav);
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 1px;
    }
    .logo span {
      background: linear-gradient(135deg, #2D1B3D, #4A2C5A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition-base);
    }

    .nav-links a:hover {
      color: var(--primary-deep);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      margin-left: 16px;
      padding: 10px 24px;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary-deep);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--primary-deep);
      z-index: 200;
      flex-direction: column;
      padding: 80px 32px;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: var(--white);
      font-size: 1.4rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }
    .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background-image: radial-gradient(circle at 85% 20%, rgba(212, 175, 55, 0.06) 0%, transparent 40%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(212, 175, 55, 0.15);
      color: var(--accent-gold-light);
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      margin-bottom: 16px;
    }

    .hero-content h1 {
      margin-bottom: 1.2rem;
      color: var(--primary-deep);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
      width: 100%;
      aspect-ratio: 1/1;
      object-fit: cover;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 58px;
    }

    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: var(--white);
      border-radius: var(--border-radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }

    .card-icon {
      font-size: 40px;
      color: var(--accent-gold);
      margin-bottom: 24px;
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(212, 175, 55, 0.08);
      border-radius: 16px;
    }

    .badge-gold {
      background: linear-gradient(135deg, #D4AF37, #C29B2E);
      color: white;
      padding: 6px 16px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
      align-self: flex-start;
      margin-top: auto;
    }

    /* 数字成果 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
      text-align: center;
    }

    .stat-item {
      background: var(--white);
      padding: 32px 16px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .testimonial-card {
      background: #F8F5F0;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 34px;
      position: relative;
    }

    .testimonial-text {
      font-style: italic;
      font-size: 1.15rem;
      margin: 18px 0;
    }

    .client-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }
    .client-info img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 14px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-gradient);
      border-radius: 28px;
      padding: 70px 50px;
      text-align: center;
      margin: 40px 0;
    }
    .cta-banner h2 {
      color: white;
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: #2D1B3D;
      color: var(--text-light);
      padding: 70px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 45px;
      margin-bottom: 45px;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero-grid { grid-template-columns: 1fr; }
      .solutions-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .solutions-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 520px) {
      .hero-buttons .btn { width: 100%; }
    }