/* roulang page: index */
:root {
      --primary-deep: #1A2A1F;
      --accent-gold: #C8A96E;
      --bg-warm: #F9F7F4;
      --accent-wine: #7A2E3B;
      --text-main: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-muted: #8C8C8C;
      --success-green: #2D5A3D;
      --alert-red: #8B3A3A;
      --white: #FFFFFF;
      --near-white: #FCFCFA;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-button: 0 6px 18px rgba(26,42,31,0.3);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-mono: 'Inter', system-ui, sans-serif;
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      font-weight: 600;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }

    p {
      color: var(--text-secondary);
      font-weight: 400;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航样式 */
    #header {
      position: sticky;
      top: 0;
      background: var(--white);
      height: var(--header-height);
      display: flex;
      align-items: center;
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s ease;
    }

    #header.scrolled {
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 1px;
    }

    .nav-desktop {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-desktop a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      padding: 0.5rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.25s, border-color 0.25s;
    }

    .nav-desktop a:hover,
    .nav-desktop a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.25s;
      display: block;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(249,247,244,0.98);
      backdrop-filter: blur(12px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.5rem;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      font-family: var(--font-serif);
      color: var(--primary-deep);
    }

    .mobile-menu .close-btn {
      position: absolute;
      top: 2rem;
      right: 2rem;
      font-size: 2rem;
      background: none;
      border: none;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 通用板块 */
    section {
      padding: 5rem 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 3.5rem 0;
      }
      .container {
        padding: 0 1.5rem;
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #F9F7F4 0%, #f2efe8 100%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 40%;
      position: relative;
    }

    .hero-right img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
      transition: transform 0.4s ease;
    }

    .hero-right:hover img {
      transform: scale(1.02);
    }

    .hero-left h1 {
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }

    .hero-left .subtitle {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
      font-weight: 500;
    }

    .hero-left p {
      font-size: 1.1rem;
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-deep);
      color: white;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: #0F1A12;
      transform: translateY(-2px);
      box-shadow: var(--shadow-button);
    }

    .btn-outline {
      background: transparent;
      color: var(--accent-gold);
      border: 2px solid var(--accent-gold);
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: rgba(200,169,110,0.1);
      transform: translateY(-2px);
    }

    /* Highlights */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .highlight-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: all 0.3s ease;
    }

    .highlight-card:hover {
      border-color: var(--accent-gold);
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .highlight-number {
      font-family: var(--font-serif);
      font-size: 3rem;
      color: var(--accent-gold);
      font-weight: 700;
    }

    /* Cases Masonry */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

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

    .case-card img {
      transition: transform 0.4s;
    }

    .case-card:hover img {
      transform: scale(1.04);
    }

    .case-content {
      padding: 1.5rem;
    }

    .tag {
      display: inline-block;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 0.2rem 0.9rem;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-top: 0.8rem;
    }

    /* comparison table */
    .comparison-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }

    .plan-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: 0.3s;
    }

    .plan-card.featured {
      background: var(--primary-deep);
      color: white;
      border-color: var(--accent-gold);
    }

    .plan-card.featured h3, .plan-card.featured p {
      color: white;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.4rem 0;
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 1rem;
      font-weight: 600;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #f6f5f2;
      border-radius: 0 0 8px 8px;
      padding-left: 1.8rem;
    }

    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 1rem;
    }

    /* CTA */
    #cta {
      background: var(--primary-deep);
      color: white;
      text-align: center;
    }

    .btn-gold {
      background: var(--accent-gold);
      color: #1A2A1F;
      padding: 1.2rem 3rem;
      font-weight: 700;
      font-size: 1.2rem;
      border-radius: var(--radius-sm);
      transition: 0.25s;
    }

    .btn-gold:hover {
      background: #b8944f;
      transform: translateY(-3px);
    }

    /* footer */
    #contact {
      background: #1E1E1E;
      color: #B0B0B0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .highlights-grid, .cases-masonry, .comparison-table {
        grid-template-columns: 1fr;
      }
      .hero-grid {
        flex-direction: column;
      }
      .nav-desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }