/* roulang page: index */
:root {
      --gold: #C19A6B;
      --deep: #1C1C1E;
      --warm-light: #F5F0EB;
      --accent-red: #D94F4F;
      --text-primary: #2C2C2C;
      --text-heading: #1C1C1E;
      --border-soft: #E0D8CF;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(28,28,30,0.04);
      --shadow-md: 0 8px 24px rgba(28,28,30,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-light);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-soft);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--deep);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--gold);
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--gold);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: background var(--transition);
      border: none;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background: #B83A3A;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--gold);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep);
      transition: 0.3s;
    }
    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--deep);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 99;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      color: var(--warm-light);
      font-size: 1.5rem;
      font-weight: 500;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2rem;
      color: white;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: var(--warm-light);
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-serif);
      font-size: 3.4rem;
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1.2rem;
    }
    .hero-left .subtitle {
      font-size: 1.1rem;
      color: #5C5C5C;
      max-width: 480px;
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    /* 通用区块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 2.3rem;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 60px;
      text-align: center;
    }
    /* 优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--gold);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      margin-bottom: 8px;
      color: var(--text-heading);
    }
    .feature-card p {
      color: #6B6B6B;
      font-size: 0.95rem;
    }
    /* 案例瀑布 */
    .case-grid {
      columns: 3;
      column-gap: 28px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-soft);
      margin-bottom: 28px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-card img {
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-content h3 {
      font-family: var(--font-serif);
      margin-bottom: 10px;
    }
    .tag {
      background: var(--warm-light);
      color: var(--gold);
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-summary {
      color: #6B6B6B;
      font-size: 0.9rem;
    }
    /* 方案对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
      background: var(--warm-light);
      padding: 40px;
      border-radius: 24px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-soft);
    }
    .vs-badge {
      background: var(--gold);
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
      font-size: 0.95rem;
    }
    .icon-check {
      color: var(--gold);
    }
    .icon-cross {
      color: var(--accent-red);
    }
    /* 数据深色块 */
    .stats {
      background: var(--deep);
      color: white;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 40px;
    }
    .stat-item .number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--gold);
      font-family: 'Inter', sans-serif;
    }
    .stat-label {
      color: #ccc;
      margin-top: 8px;
    }
    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border-soft);
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #FBF9F7;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: #5C5C5C;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 联系CTA */
    .contact-cta {
      background: var(--gold);
      text-align: center;
      padding: 80px 0;
    }
    .contact-card {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      max-width: 600px;
      margin: 0 auto;
      padding: 40px;
      border-radius: 24px;
    }
    .inline-form {
      display: flex;
      gap: 12px;
      margin-top: 24px;
    }
    .inline-form input {
      flex: 1;
      padding: 14px;
      border: none;
      border-radius: var(--radius-input);
      background: white;
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.05);
    }
    /* 页脚 */
    .footer {
      background: var(--deep);
      color: #A0A0A0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      color: white;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { columns: 2; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 20px auto; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero { padding: 120px 0 60px; }
      .hero-left h1 { font-size: 2.4rem; }
      .features-grid { grid-template-columns: 1fr; }
      .case-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .inline-form { flex-direction: column; }
      .stats-grid { flex-direction: column; }
    }