/* roulang page: index */
:root {
      --primary-green: #1A5F3A;
      --accent-orange: #E85D04;
      --warm-cream: #F4F0E6;
      --deep-charcoal: #2D2D2D;
      --card-bg: #FFFFFF;
      --border-warm: #E0D9CD;
      --text-secondary: #5C5C5C;
      --shadow-card: 0 2px 16px rgba(0,0,0,0.04), 0 0 0 1px rgba(0,0,0,0.03);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-capsule: 50px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      font-weight: 400;
      font-size: 16px;
      line-height: 1.75;
      background-color: var(--warm-cream);
      color: var(--deep-charcoal);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    h1, h2, h3, h4 {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      color: var(--deep-charcoal);
    }
    h1 {
      font-size: 48px;
      line-height: 56px;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 32px;
      line-height: 40px;
      margin-bottom: 1.2rem;
    }
    h3 {
      font-size: 20px;
      line-height: 28px;
      font-weight: 500;
    }
    
    .inter-number {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      font-weight: 700;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 悬浮胶囊导航 */
    .floating-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 1150px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: var(--radius-capsule);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 4px 18px rgba(0,0,0,0.06), 0 0 0 1px rgba(45,45,45,0.05);
      z-index: 99;
      transition: var(--transition-smooth);
    }
    
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-green);
      letter-spacing: 0.02em;
      white-space: nowrap;
    }
    .logo i {
      color: var(--accent-orange);
      margin-right: 6px;
      font-size: 24px;
    }
    
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--deep-charcoal);
      text-decoration: none;
      font-size: 15px;
      position: relative;
      padding-bottom: 6px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary-green);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent-orange);
      border-radius: 2px;
    }
    
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--deep-charcoal);
    }
    
    /* Section 通用 */
    section {
      padding: 90px 0;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-header h2 {
      display: inline-block;
      border-left: 5px solid var(--accent-orange);
      padding-left: 18px;
    }
    
    /* 按钮 */
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      border: none;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
      text-decoration: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #D14D00;
      color: white;
      text-decoration: none;
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary-green);
      border: 1.7px solid var(--primary-green);
      border-radius: var(--radius-btn);
      padding: 13px 32px;
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: var(--primary-green);
      color: white;
    }
    
    /* 卡片基础 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      border: 1px solid rgba(224,217,205,0.5);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* Hero 区域 */
    #home {
      padding-top: 130px;
      background: var(--warm-cream);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 22px;
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      display: block;
    }
    
    /* Features 网格 2:1:1 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .feature-large {
      display: flex;
      gap: 24px;
      align-items: center;
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
    }
    .feature-large img {
      width: 45%;
      border-radius: 12px;
      object-fit: cover;
    }
    .feature-small {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      border-left: 3px solid transparent;
      transition: 0.25s;
    }
    .feature-small:hover {
      border-left-color: var(--accent-orange);
    }
    
    /* Cases 瀑布流 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .case-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
      transition: transform 0.35s;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: #f0f0f0;
      color: var(--primary-green);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
    }
    
    /* Compare */
    .compare-wrapper {
      display: flex;
      gap: 30px;
      align-items: stretch;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 35px;
    }
    .compare-col.highlight {
      background: #f6fbf9;
      box-shadow: 0 0 0 2px var(--primary-green);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-warm);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary-green);
    }
    
    /* CTA banner */
    .cta-banner {
      background: var(--primary-green);
      border-radius: 24px;
      padding: 60px 40px;
      text-align: center;
      color: white;
    }
    
    /* Footer */
    footer {
      background: var(--deep-charcoal);
      color: #ddd;
      padding: 60px 0 30px;
    }
    
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr 1fr; }
      .feature-large { grid-column: span 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .cases-waterfall { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      h1 { font-size: 36px; }
    }