/* roulang page: index */
:root {
      --primary: #2C6FAC;
      --primary-hover: #1E5A8E;
      --accent: #D4A853;
      --accent-light: #fef9e7;
      --bg-page: #FAFCFE;
      --bg-subtle: #F1F5F9;
      --card-bg: #FFFFFF;
      --text-heading: #1A2B3C;
      --text-body: #3A4A5A;
      --text-muted: #6B7B8B;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 4px 14px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.07);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "SF Mono", "Fira Code", "Courier New", monospace;
      --transition: all 0.25s ease;
      --max-width: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 600;
      margin-top: 0;
    }

    h1 {
      font-size: clamp(2.2rem, 6vw, 3.2rem);
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      margin-bottom: 1rem;
      font-weight: 600;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

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

    a:hover {
      color: var(--primary-hover);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 - 玻璃效果 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      background: rgba(250,252,254,0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      background: #FAFCFE;
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-heading);
      letter-spacing: -0.3px;
    }

    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }

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

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.3rem 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 0.95rem;
      gap: 0.5rem;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(44,111,172,0.25);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(44,111,172,0.06);
      color: var(--primary-hover);
    }

    .btn-large {
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-heading);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(250,252,254,0.8);
      backdrop-filter: blur(2px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
      padding: 2rem 0;
    }

    .hero h1 {
      margin-bottom: 1.2rem;
    }

    .hero p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }

    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    .section {
      padding: 6rem 0;
    }

    .section-subtle {
      background: var(--bg-subtle);
    }

    .section-heading {
      text-align: center;
      margin-bottom: 3rem;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }

    .pain-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      flex: 1 1 240px;
      transition: var(--transition);
    }

    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }

    .pain-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }

    /* 解决方案步骤 */
    .step-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .step-row.reverse {
      flex-direction: row-reverse;
    }

    .step-text {
      flex: 1;
    }

    .step-visual {
      flex: 1;
      background: var(--bg-subtle);
      border-radius: var(--radius-card);
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 1.5rem;
    }

    .step-visual img {
      max-width: 100%;
      height: auto;
      border-radius: 8px;
    }

    .step-number {
      color: var(--primary);
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 0.5rem;
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 3rem;
      flex-wrap: wrap;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-top: 0.4rem;
    }

    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      flex: 1 1 260px;
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }

    .testimonial-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-top: 1.5rem;
    }

    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: var(--bg-subtle);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-title {
      background: transparent;
      padding: 1.2rem 0;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-heading);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: var(--transition);
    }

    .accordion-title i {
      transition: transform 0.25s;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: transparent;
      color: var(--text-body);
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 1.2rem;
      background: var(--bg-subtle);
    }

    .accordion-item.active .accordion-title i {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-box {
      background: var(--bg-subtle);
      border-radius: var(--radius-card);
      padding: 4rem 2rem;
      text-align: center;
    }

    /* 页脚 */
    .site-footer {
      background: #1A2B3C;
      color: #C8D6E5;
      padding: 3rem 0 1.5rem;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer-links a {
      color: #C8D6E5;
      margin-right: 1.5rem;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: var(--accent);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 1.5rem;
      font-size: 0.85rem;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .step-row, .step-row.reverse {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250,252,254,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.2rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero {
        min-height: 80vh;
      }
    }