/* roulang page: index */
:root {
      --primary: #3E2C26;
      --primary-deep: #2B1F1A;
      --accent: #C8A882;
      --accent-light: rgba(200,168,130,0.15);
      --accent-bg: rgba(200,168,130,0.08);
      --bg: #FBF7F2;
      --white: #FFFFFF;
      --text: #3E2C26;
      --text-light: #6B5A55;
      --border: rgba(200,168,130,0.3);
      --shadow-sm: 0 4px 20px rgba(62,44,38,0.06);
      --shadow-md: 0 12px 32px rgba(62,44,38,0.12);
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 20px;
      --radius-pill: 30px;
      --gap: 24px;
      --section-gap: 100px;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --transition: 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-weight: 300;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    h1, h2, h3, h4, h5, h6 {
      margin: 0;
      font-weight: 500;
      line-height: 1.3;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航卡片面板 */
    #nav {
      position: fixed;
      top: 16px;
      left: 0;
      right: 0;
      z-index: 100;
      padding: 0 20px;
    }
    .nav-panel {
      max-width: 1200px;
      margin: 0 auto;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-radius: 16px;
      box-shadow: 0 8px 28px rgba(62,44,38,0.08);
      border: 1px solid rgba(200,168,130,0.18);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 24px;
      transition: var(--transition);
    }
    .nav-brand {
      font-weight: 700;
      font-size: 1.35rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .nav-brand i {
      color: var(--accent);
      font-size: 1.6rem;
    }
    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
      flex-wrap: wrap;
    }
    .nav-card {
      display: flex;
      align-items: center;
      gap: 6px;
      background: var(--bg);
      border-radius: 10px;
      padding: 10px 16px;
      color: var(--primary);
      font-weight: 500;
      font-size: 0.9rem;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .nav-card i {
      font-size: 1.1rem;
      color: var(--accent);
    }
    .nav-card:hover {
      background: var(--white);
      border-color: var(--accent);
      box-shadow: var(--shadow-sm);
      transform: translateY(-1px);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 500;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: var(--primary-deep);
      box-shadow: 0 0 0 4px rgba(200,168,130,0.25);
      color: white;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
      padding: 4px;
    }
    @media (max-width: 1024px) {
      .nav-links { gap: 4px; }
      .nav-card { padding: 8px 12px; font-size: 0.85rem; }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 20px;
        right: 20px;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(18px);
        border-radius: 20px;
        flex-direction: column;
        padding: 20px;
        gap: 12px;
        box-shadow: var(--shadow-md);
        border: 1px solid var(--border);
      }
      .nav-links.active { display: flex; }
      .nav-card { width: 100%; justify-content: flex-start; }
      .nav-cta { margin-left: 0; width: 100%; text-align: center; }
    }
    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 60px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 32px;
      font-weight: 300;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 14px 34px;
      font-weight: 500;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1rem;
      letter-spacing: 0.3px;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 0 0 4px rgba(200,168,130,0.25);
      color: white;
    }
    .btn-secondary {
      background: transparent;
      color: var(--accent);
      border: 1px solid var(--accent);
      border-radius: var(--radius-pill);
      padding: 14px 34px;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1rem;
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      background: var(--accent-bg);
      color: var(--primary);
      border-color: var(--primary);
    }
    .hero-img-wrapper {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(62,44,38,0.15);
      position: relative;
    }
    .hero-img-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-lg);
    }
    .particle-glow {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(200,168,130,0.25) 0%, transparent 60%);
      pointer-events: none;
      animation: driftGlow 6s ease-in-out infinite alternate;
    }
    @keyframes driftGlow {
      0% { opacity: 0.5; transform: scale(1); }
      100% { opacity: 0.8; transform: scale(1.05); }
    }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; gap: 32px; }
      .hero-title { font-size: 2.6rem; }
      #hero { padding-top: 120px; }
    }
    /* 板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 500;
      color: var(--primary);
      display: inline-block;
      position: relative;
      padding-bottom: 12px;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 50px;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .section-sub {
      color: var(--text-light);
      margin-top: 12px;
      font-weight: 300;
      font-size: 1.1rem;
    }
    /* 亮点网格 */
    #highlights {
      padding: 80px 0;
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: left;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .highlight-icon {
      font-size: 2.6rem;
      color: var(--accent);
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .highlight-card:hover .highlight-icon {
      transform: scale(1.08);
    }
    .highlight-card h3 {
      font-size: 1.35rem;
      font-weight: 500;
      margin-bottom: 12px;
    }
    .highlight-card p {
      color: var(--text-light);
      font-weight: 300;
    }
    @media (max-width: 768px) {
      .highlights-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .highlights-grid { grid-template-columns: 1fr; }
    }
    /* 案例瀑布 */
    #showcase {
      padding: 80px 0;
      background: var(--white);
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--bg);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .masonry-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .masonry-img {
      position: relative;
      overflow: hidden;
    }
    .masonry-img img {
      width: 100%;
      display: block;
      transition: transform 0.4s ease;
    }
    .masonry-item:hover .masonry-img img {
      transform: scale(1.04);
    }
    .masonry-overlay {
      position: absolute;
      inset: 0;
      background: rgba(62,44,38,0);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.3s ease;
      color: white;
      font-weight: 500;
      font-size: 1.1rem;
      opacity: 0;
    }
    .masonry-item:hover .masonry-overlay {
      background: rgba(62,44,38,0.55);
      opacity: 1;
    }
    .masonry-text {
      padding: 20px;
      background: white;
    }
    .masonry-text h4 {
      font-weight: 500;
      margin-bottom: 6px;
    }
    @media (max-width: 768px) {
      .masonry { columns: 2; }
    }
    @media (max-width: 520px) {
      .masonry { columns: 1; }
    }
    /* 方案对比 */
    #compare {
      padding: 80px 0;
    }
    .compare-grid {
      display: flex;
      gap: 32px;
      align-items: stretch;
    }
    .compare-col {
      flex: 1;
      background: var(--white);
      border-radius: var(--radius);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
    }
    .compare-col.premium {
      background: #F5EFE7;
      border: 1px solid var(--accent);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 20px;
    }
    .compare-table th {
      background: var(--primary);
      color: white;
      font-weight: 500;
      padding: 14px;
      text-align: left;
      border-radius: 6px 6px 0 0;
    }
    .compare-table td {
      padding: 14px;
      border-bottom: 1px solid var(--border);
      font-weight: 300;
    }
    .highlight-row {
      background: var(--accent-bg);
    }
    @media (max-width: 768px) {
      .compare-grid { flex-direction: column; }
    }
    /* FAQ */
    #faq {
      padding: 80px 0;
      background: var(--white);
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border);
    }
    .accordion-title {
      background: var(--white);
      padding: 20px 16px;
      font-weight: 500;
      font-size: 1.15rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 10px;
      transition: background 0.2s;
    }
    .accordion-title::before {
      content: '●';
      color: var(--accent);
      font-size: 1.2rem;
    }
    .accordion-title:hover {
      background: #FDF9F5;
    }
    .accordion-content {
      background: var(--bg);
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .accordion-item.active .accordion-content {
      max-height: 300px;
      padding: 20px;
    }
    /* 联系 */
    #contact {
      padding: 80px 0;
    }
    .contact-card {
      background: var(--primary);
      border-radius: var(--radius-lg);
      padding: 48px 40px;
      color: white;
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .contact-form {
      flex: 1 1 300px;
    }
    .contact-info {
      flex: 1 1 250px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .contact-card input, .contact-card textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #ddd;
      background: white;
      font-weight: 300;
    }
    .contact-card input:focus, .contact-card textarea:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(200,168,130,0.2);
    }
    .contact-submit {
      background: var(--accent);
      color: var(--primary);
      font-weight: 600;
      border: none;
      border-radius: var(--radius-pill);
      padding: 14px 32px;
      cursor: pointer;
      transition: var(--transition);
    }
    .contact-submit:hover {
      background: #dbb078;
    }
    /* 页脚 */
    #footer {
      background: var(--primary);
      color: var(--accent);
      text-align: center;
      padding: 28px 20px;
      font-size: 0.9rem;
      font-weight: 300;
    }
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }