/* roulang page: index */
:root {
      --primary-deep: #1a1a1a;
      --accent-red: #e63946;
      --accent-red-hover: #c1121f;
      --gold: #d4a853;
      --bg-warm: #f8f7f4;
      --deep-blue-gray: #1c2128;
      --text-dark: #2d2d2d;
      --text-mid: #6b6b6b;
      --text-light: #f0efe9;
      --border-subtle: #e8e5df;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 28px rgba(0,0,0,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "Oswald", sans-serif;
      --container: 1200px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 - 沉浸式半透明 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 64px;
      background: rgba(28,33,40,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background 0.3s ease, height 0.2s;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      background: rgba(28,33,40,0.97);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-light);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo i {
      color: var(--accent-red);
      font-size: 1.8rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      color: #e0ded8;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width 0.25s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: #ffffff;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 8px 18px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }
    .nav-cta:hover {
      background: var(--accent-red-hover);
      transform: translateY(-1px);
      color: white !important;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-light);
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(28,33,40,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        gap: 24px;
        padding: 32px 24px;
        align-items: flex-start;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .site-header {
        height: 56px;
      }
    }
    
    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 56px 0;
      }
    }
    
    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--deep-blue-gray) 0%, #1a1a1a 100%);
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: var(--text-light);
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.35;
      z-index: 0;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero .sub {
      font-size: 1.25rem;
      color: #d0ccc5;
      margin-bottom: 32px;
      max-width: 550px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--accent-red-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #2d2d2d;
      color: #2d2d2d;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline-light {
      border-color: #ddd;
      color: #f0efe9;
    }
    .btn-outline-light:hover {
      background: white;
      color: #1a1a1a;
    }
    .hero-visual {
      flex: 1 1 400px;
      text-align: center;
    }
    .hero-visual img {
      max-width: 100%;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    
    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .pain-card {
      background: white;
      padding: 28px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--accent-red);
    }
    
    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all var(--transition);
      box-shadow: var(--card-shadow);
      text-align: left;
      border: 1px solid var(--border-subtle);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .solution-icon {
      font-size: 2.2rem;
      color: var(--accent-red);
      margin-bottom: 16px;
    }
    
    /* 成果数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      color: var(--accent-red);
      font-weight: 700;
      letter-spacing: 1px;
    }
    
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      gap: 18px;
      align-items: flex-start;
    }
    .avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      object-fit: cover;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      padding-left: 12px;
      border-left: 3px solid var(--accent-red);
    }
    
    /* CTA */
    .cta-band {
      background: var(--deep-blue-gray);
      color: var(--text-light);
      text-align: center;
      padding: 80px 0;
    }
    
    /* Footer */
    .footer {
      background: #1c2128;
      color: #b0b0b0;
      padding: 40px 0 20px;
    }
    
    @media (max-width: 1024px) {
      .pain-grid, .solutions-grid, .stats-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .hero h1 {
        font-size: 2.6rem;
      }
    }
    @media (max-width: 640px) {
      .pain-grid, .solutions-grid, .stats-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
    }
    
    h2 {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-mid);
      max-width: 700px;
    }