/* roulang page: index */
:root {
      --primary: #E8453A;
      --primary-dark: #c0392b;
      --secondary: #1B3A2D;
      --accent: #F5A623;
      --bg: #FAF9F6;
      --white: #FFFFFF;
      --gray-light: #F3F4F6;
      --gray-mid: #6B7280;
      --gray-dark: #2D2D2D;
      --success: #2E8B57;
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-sm: 12px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-title: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "PingFang SC", sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--secondary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 640px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 导航 */
    #main-nav {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.03);
      transition: var(--transition);
    }
    #main-nav.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.05);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .desktop-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--secondary);
    }
    .desktop-links a.active {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
      padding-bottom: 4px;
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(232,69,58,0.3);
    }
    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(232,69,58,0.4);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid rgba(0,0,0,0.05);
      justify-content: space-around;
      align-items: center;
      height: 64px;
      z-index: 60;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.04);
    }
    .mobile-bottom-nav .nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--gray-mid);
      font-weight: 500;
      gap: 4px;
      transition: var(--transition);
    }
    .mobile-bottom-nav .nav-item i {
      font-size: 1.2rem;
    }
    .mobile-bottom-nav .nav-item.active {
      color: var(--primary);
    }

    @media (max-width: 640px) {
      .desktop-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      #main-nav {
        height: 60px;
      }
      body {
        padding-bottom: 70px;
      }
    }

    /* 板块通用间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
    }

    /* 标题风格 */
    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
      color: var(--secondary);
    }
    @media (max-width: 640px) {
      h2 {
        font-size: 1.75rem;
        margin-bottom: 32px;
      }
    }

    /* 卡片基础 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    /* 按钮变量 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 6px 18px rgba(232,69,58,0.25);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 10px 24px rgba(232,69,58,0.35);
      background: linear-gradient(135deg, var(--accent), var(--primary));
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(232,69,58,0.08);
      border-color: var(--primary-dark);
    }

    /* 数据徽章 */
    .badge-stats {
      background: rgba(245,166,35,0.15);
      color: var(--secondary);
      border-radius: 16px;
      padding: 8px 16px;
      font-weight: 700;
      font-size: 1.4rem;
      font-family: var(--font-number);
      letter-spacing: 1px;
      border: 1px solid rgba(245,166,35,0.3);
      display: inline-block;
    }

    /* Hero 自定义 */
    .hero-bg {
      background: radial-gradient(circle at 20% 30%, rgba(232,69,58,0.04) 0%, transparent 50%);
    }
    .hero-image-card {
      border-radius: 24px;
      overflow: hidden;
      position: relative;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
    }
    .hero-image-card img {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }
    .hero-badge-float {
      position: absolute;
      bottom: -12px;
      right: -12px;
      background: var(--accent);
      color: #1B3A2D;
      padding: 8px 20px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 8px 18px rgba(245,166,35,0.4);
    }

    /* 痛点卡片 */
    .pain-card {
      background: white;
      border-radius: 20px;
      padding: 28px 24px;
      position: relative;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .pain-badge-top {
      position: absolute;
      top: -14px;
      right: 20px;
      background: rgba(245,166,35,0.2);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--secondary);
      border: 1px solid rgba(245,166,35,0.4);
    }

    /* 成果数字 */
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 2px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #F9FAFB;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #FAF9F6;
      padding: 0 24px;
      font-size: 0.95rem;
      color: #4B5563;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      box-shadow: inset 0 1px 6px rgba(0,0,0,0.03);
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, #E8453A 0%, #F5A623 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    footer {
      background: #1B3A2D;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      margin-bottom: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 500px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: white;
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--accent);
      transform: scale(1.1);
    }