/* roulang page: index */
:root {
      --primary: #E8380F;
      --primary-dark: #C12A0A;
      --primary-light: #FF6B35;
      --secondary: #1A1A2E;
      --accent: #FFB800;
      --bg-light: #F5F5F7;
      --card-white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #5A5A6E;
      --text-light: #F5F5F7;
      --border-light: #E8E8EC;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
      --shadow-brand: 0 8px 30px rgba(232,56,15,0.15);
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --radius-btn: 100px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
      --font-number: "DIN Alternate", "PingFang SC", "Inter", sans-serif;
      --transition: 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 28px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 76px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--secondary);
      font-weight: 700;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-link {
      font-weight: 500;
      color: #2C2C3A;
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
      font-size: 15px;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: 0.2s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(232,56,15,0.25);
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 18px rgba(232,56,15,0.35);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 4px;
      transition: 0.2s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 36px;
      transition: right 0.3s ease;
      z-index: 101;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 600;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 28px;
      font-size: 32px;
      color: white;
      background: none;
      border: none;
    }

    /* Hero */
    .hero {
      padding: 150px 0 90px;
      background: linear-gradient(135deg, #1A1A2E 0%, #2D2D44 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -50px;
      right: -30px;
      width: 550px;
      height: 550px;
      background: radial-gradient(circle, rgba(232,56,15,0.45) 0%, rgba(26,26,46,0) 70%);
      border-radius: 50%;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 48px;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E8380F, #FF6B35);
      color: white;
      padding: 16px 42px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      transition: all 0.2s;
      box-shadow: 0 8px 24px rgba(232,56,15,0.4);
      display: inline-block;
    }
    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 14px 32px rgba(232,56,15,0.5);
    }
    .hero-visual {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 340px;
      border-radius: var(--radius-lg);
      opacity: 0.9;
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section h2 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 36px;
      margin-bottom: 20px;
      color: var(--secondary);
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto 50px;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pain-card {
      background: var(--card-white);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-brand);
    }
    .pain-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }
    .pain-card h3 {
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 10px;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card-white);
      padding: 32px 20px;
      border-radius: var(--radius-lg);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .solution-icon {
      font-size: 42px;
      margin-bottom: 18px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-badge {
      background: rgba(232,56,15,0.08);
      border-radius: var(--radius-md);
      padding: 28px 16px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 46px;
      font-weight: 700;
      color: var(--accent);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #FAFAFA;
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .testimonial-avatar {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: #ddd;
      margin-bottom: 16px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }

    /* CTA 强化 */
    .cta-band {
      background: linear-gradient(135deg, #E8380F, #FF6B35);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #AAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }

    @media (max-width: 1024px) {
      .hero h1 { font-size: 40px; }
      .solution-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .pain-grid, .testimonial-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }