/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #E43D12;
      --primary-dark: #c7330e;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --bg-light: #F9F9FB;
      --white: #ffffff;
      --text-main: #1A1A2E;
      --text-weak: #5A5A72;
      --border-light: #E8E8EC;
      --radius-card: 16px;
      --radius-btn: 40px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --transition: 0.3s ease;
      --font-title: 'Noto Sans SC', 'PingFang SC', system-ui, sans-serif;
      --font-body: 'Noto Sans SC', 'PingFang SC', system-ui, sans-serif;
      --font-number: 'Inter', system-ui, sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 标题层级 */
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.2;
    }
    
    h2 {
      font-size: 2.25rem; /* 36px */
      margin-bottom: 0.5rem;
      color: var(--secondary);
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      position: relative;
      display: inline-block;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 50px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s ease;
      border: 2px solid transparent;
      white-space: nowrap;
    }
    
    .btn-primary {
      background: var(--primary);
      color: var(--white);
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: #c7330e;
      border-color: #c7330e;
      transform: scale(1.03);
      box-shadow: 0 10px 25px rgba(228,61,18,0.3);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(228,61,18,0.08);
      transform: scale(1.03);
    }
    
    .btn-white {
      background: var(--white);
      color: var(--primary);
      border-color: var(--white);
    }
    .btn-white:hover {
      background: #f0f0f0;
      transform: scale(1.03);
      box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }
    
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 15px rgba(0,0,0,0.04);
      z-index: 1000;
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--secondary);
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width 0.3s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
    }
    
    /* 版块间距 */
    section {
      padding: 100px 0;
    }
    
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--white);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 1.25rem;
      line-height: 1.15;
    }
    .hero-content .subtitle {
      font-size: 1.25rem;
      color: var(--secondary);
      margin-bottom: 2rem;
      font-weight: 500;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }
    .trust-badges {
      display: flex;
      gap: 2rem;
      align-items: center;
      color: var(--text-weak);
      font-size: 0.9rem;
    }
    .trust-badges i {
      color: var(--accent);
      margin-right: 4px;
    }
    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: var(--shadow-md);
      width: 100%;
      object-fit: cover;
    }
    
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      background: linear-gradient(135deg, rgba(228,61,18,0.02) 0%, rgba(255,255,255,0.9) 100%);
      position: relative;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      background: linear-gradient(135deg, rgba(228,61,18,0.08) 0%, rgba(255,255,255,0.95) 100%);
    }
    .highlight-card.large {
      grid-row: span 2;
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(228,61,18,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
    }
    .highlight-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.75rem;
    }
    
    /* 方案卡片 */
    .programs-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .program-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 2px solid transparent;
      position: relative;
    }
    .program-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .program-card.featured {
      border-color: var(--primary);
    }
    .badge-hot {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--primary);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    .program-price {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      margin: 1rem 0;
    }
    
    /* 口碑瀑布流 */
    .testimonials-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
      break-inside: avoid;
      transition: 0.2s;
    }
    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
    }
    
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--white);
      border-radius: 12px;
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }
    
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 20px;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .programs-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .main-header .nav-links { display: none; }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        background: white;
        border-radius: 30px;
        padding: 8px 20px;
        box-shadow: 0 8px 30px rgba(0,0,0,0.15);
        gap: 1.5rem;
        z-index: 999;
      }
      .hero .container { flex-direction: column; }
      .highlights-grid { grid-template-columns: 1fr; }
      .programs-grid { grid-template-columns: 1fr; }
      .testimonials-masonry { columns: 1; }
      .faq-grid { grid-template-columns: 1fr; }
    }