/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #E84A2D;
      --primary-hover: #C53D24;
      --secondary: #1B1B2F;
      --accent: #FCA311;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --gray-light: #F3F4F6;
      --text: #374151;
      --text-light: #6B7280;
      --white: #FFFFFF;
      --border: #E5E7EB;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 50px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: all 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

    /* ----- 重置 & 基础 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -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;
      transition: var(--transition);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 板块通用间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* ----- 排版 ----- */
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--secondary);
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--secondary);
      margin-bottom: 0.5rem;
    }

    h3 {
      font-size: 24px;
      font-weight: 600;
      line-height: 1.4;
      color: var(--secondary);
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 3rem;
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      h3 {
        font-size: 20px;
      }
    }

    /* ----- 导航 Header ----- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--secondary);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 0.25rem 0;
      font-size: 16px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-links a:hover {
      color: var(--primary);
    }

    .btn-capsule {
      background: var(--primary);
      color: var(--white);
      border-radius: var(--radius-full);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 4px 10px rgba(232,74,45,0.2);
    }
    .btn-capsule:hover {
      background: var(--primary-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      width: 28px;
    }
    .hamburger span {
      height: 3px;
      background: var(--secondary);
      border-radius: 3px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 5rem 2rem;
        box-shadow: -5px 0 20px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        gap: 2rem;
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 60;
      }
      .btn-capsule.mobile-cta {
        width: 100%;
        margin-top: 1rem;
      }
    }

    /* ----- 按钮体系 ----- */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-full);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 6px 16px rgba(232,74,45,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-full);
      padding: 12px 30px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* ----- Hero 首屏 ----- */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 1.2rem;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }
    .hero-image {
      flex: 1;
      background: #f0f2f5;
      border-radius: var(--radius-lg);
      overflow: hidden;
      min-height: 360px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: url('/assets/images/backpic/hero-sport.webp');
      background-size: cover;
      background-position: center;
      color: white;
      font-weight: 500;
    }
    .data-badges {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .badge-item {
      background: rgba(252,163,17,0.12);
      backdrop-filter: blur(4px);
      padding: 1rem 1.5rem;
      border-radius: var(--radius-md);
      text-align: center;
      background-color: #fff6e5;
    }
    .badge-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
    }
    .badge-label {
      font-size: 14px;
      color: var(--text-light);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-image {
        width: 100%;
        min-height: 260px;
      }
    }

    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(232,74,45,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 1.5rem;
    }

    .tag-accent {
      background: var(--accent);
      color: #1b1b2f;
      font-weight: 600;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    /* 左右交替 */
    .alt-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .alt-row.reverse {
      flex-direction: row-reverse;
    }
    .alt-text {
      flex: 1;
    }
    .alt-img {
      flex: 1;
      background: #e9eaec;
      border-radius: var(--radius-lg);
      min-height: 280px;
      background-size: cover;
      background-position: center;
    }
    @media (max-width: 768px) {
      .alt-row, .alt-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例卡片 */
    .case-card {
      background: #F3F4F6;
      border-radius: var(--radius-lg);
      padding: 1.8rem;
      text-align: center;
    }
    .avatar {
      width: 64px;
      height: 64px;
      background: #ccc;
      border-radius: 50%;
      margin: 0 auto 1rem;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
    }

    /* 定价卡 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border);
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      position: relative;
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 13px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 12px 0 4px;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 0;
      border-radius: 0;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 16px 40px;
      border-radius: 50px;
    }

    footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }