/* roulang page: index */
:root {
      --gold: #C8964E;
      --gold-dark: #B8873E;
      --stone: #2A2A2A;
      --warm-white: #FAF7F2;
      --matte-black: #1A1A1A;
      --text-body: #3A3A3A;
      --text-muted: #5A5A5A;
      --border-light: #E8E3DB;
      --shadow-card: 0 10px 40px -10px rgba(0,0,0,0.05);
      --shadow-elevated: 0 20px 50px -10px rgba(0,0,0,0.08);
      --radius-sm: 4px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      --font-heading: 'Cormorant Garamond', 'Noto Serif SC', serif;
      --font-body: 'Inter', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 排版系统 */
    h1, h2, h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.15;
      color: var(--matte-black);
    }

    .section-title {
      font-size: clamp(2.5rem, 6vw, 3.8rem);
      margin-bottom: 1.2rem;
      color: var(--matte-black);
    }

    .section-subtitle {
      font-family: var(--font-heading);
      font-weight: 400;
      font-size: clamp(1.1rem, 2.5vw, 1.5rem);
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 3rem auto;
      line-height: 1.5;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: background 0.3s;
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 0;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-shrink: 0;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--gold);
      line-height: 1;
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: var(--stone);
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      font-family: var(--font-body);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.03em;
      color: var(--stone);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--gold);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--stone);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 200px 0 140px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-title {
      font-size: clamp(3.2rem, 8vw, 5.5rem);
      font-weight: 700;
      line-height: 1.1;
      color: var(--matte-black);
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-family: var(--font-heading);
      font-size: clamp(1.2rem, 3vw, 1.8rem);
      color: var(--text-muted);
      max-width: 500px;
    }

    .hero-visual {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .golden-geometry {
      width: 280px;
      height: 280px;
      background: radial-gradient(circle at 30% 30%, rgba(200,150,78,0.18), transparent 70%);
      border: 1px solid rgba(200,150,78,0.25);
      border-radius: 50%;
      position: relative;
      animation: float 8s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-18px); }
      100% { transform: translateY(0px); }
    }

    /* 数据看板 */
    .data-dashboard {
      background: #F3EFE9;
      padding: 90px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      text-align: center;
    }

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: clamp(3rem, 6vw, 4.5rem);
      color: var(--gold);
      line-height: 1.2;
    }

    .stat-label {
      font-weight: 500;
      color: var(--stone);
      letter-spacing: 0.03em;
      margin-top: 0.5rem;
    }

    /* 服务矩阵 1+2 非对称 */
    .services {
      padding: 120px 0;
    }

    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .main-card {
      grid-row: span 2;
      background: #fff;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all 0.3s;
    }

    .main-card:hover {
      box-shadow: var(--shadow-elevated);
      transform: translateY(-3px);
    }

    .card-img {
      height: 260px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .img-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60%;
      background: linear-gradient(to top, rgba(255,255,255,0.95), transparent);
    }

    .card-content {
      padding: 28px 32px 38px;
    }

    .card-tag {
      color: var(--gold);
      font-weight: 600;
      font-size: 0.85rem;
      letter-spacing: 0.05em;
      margin-bottom: 8px;
    }

    .card-title {
      font-family: var(--font-heading);
      font-size: 1.9rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .side-cards {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .side-card {
      background: #fff;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-card);
      display: flex;
      overflow: hidden;
      transition: 0.3s;
    }

    .side-card:hover {
      box-shadow: var(--shadow-elevated);
    }

    .side-img {
      width: 45%;
      background-size: cover;
      background-position: center;
    }

    .side-content {
      padding: 28px;
      width: 55%;
    }

    /* 对比区块 */
    .comparison {
      padding: 100px 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
    }

    .compare-col {
      padding: 2.5rem;
      border-radius: var(--radius-sm);
    }

    .traditional {
      background: #f0ede8;
      color: var(--stone);
    }

    .premium {
      background: #fff;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--gold);
    }

    .compare-list {
      list-style: none;
      margin-top: 1.8rem;
    }

    .compare-list li {
      margin-bottom: 1.2rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* FAQ */
    .faq {
      padding: 100px 0;
      max-width: 800px;
      margin: 0 auto;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-btn {
      width: 100%;
      background: none;
      border: none;
      padding: 22px 0;
      font-weight: 700;
      font-size: 1.1rem;
      text-align: left;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--stone);
      transition: background 0.2s;
    }

    .accordion-btn:hover {
      background: #FAF7F2;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
      color: var(--text-muted);
      padding: 0 0;
    }

    .accordion-content.open {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* CTA 表单 */
    .cta-section {
      background: var(--stone);
      padding: 100px 0;
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .cta-text {
      color: #fff;
      font-family: var(--font-heading);
      font-size: 2.2rem;
      font-weight: 600;
    }

    .input-line {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,255,0.4);
      padding: 12px 4px;
      margin-bottom: 24px;
      width: 100%;
      color: #fff;
      font-size: 1rem;
      transition: border-color 0.3s;
    }

    .input-line:focus {
      outline: none;
      border-bottom-color: var(--gold);
    }

    .btn-gold {
      background: var(--gold);
      border: none;
      color: #fff;
      font-weight: 600;
      letter-spacing: 0.05em;
      padding: 14px 40px;
      font-size: 1rem;
      cursor: pointer;
      transition: 0.3s;
      border-radius: 0;
    }

    .btn-gold:hover {
      background: var(--gold-dark);
      transform: translateY(-2px);
    }

    footer {
      text-align: center;
      padding: 50px 0;
      border-top: 1px solid var(--gold);
      color: var(--stone);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.5rem;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        padding: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-content {
        flex-direction: column;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .compare-grid, .cta-grid {
        grid-template-columns: 1fr;
      }
    }