/* roulang page: index */
:root {
      --primary-blue: #1A5FFC;
      --accent-orange: #FF6B35;
      --success-green: #00B578;
      --alert-red: #FA5151;
      --neutral-gray: #86909C;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --dark-bg: #1F2329;
      --text-dark: #1F2329;
      --text-secondary: #4E5969;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 32px;
      --transition: all 0.25s ease;
      --font-xl: clamp(2.2rem, 5vw, 3rem);
      --font-h2: 1.8rem;
      --font-h3: 1.25rem;
      --font-body: 1rem;
      --font-small: 0.875rem;
    }

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

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      z-index: 1000;
      transition: var(--transition);
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--primary-blue);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent-orange);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      transition: var(--transition);
      position: relative;
      padding: 4px 0;
      font-size: var(--font-small);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-blue);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-blue);
    }
    .nav-cta {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: var(--font-small);
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #E55A2B;
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
      border-radius: 32px 32px 0 0;
      padding: 8px 24px 12px;
      z-index: 999;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--neutral-gray);
      gap: 4px;
    }
    .mobile-bottom-nav a i {
      font-size: 1.3rem;
    }
    .mobile-bottom-nav a.active {
      color: var(--primary-blue);
    }
    .mobile-bottom-cta {
      background: var(--accent-orange);
      color: white;
      border-radius: 40px;
      padding: 10px 20px;
      font-weight: 600;
      font-size: 0.8rem;
      border: none;
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-lines {
      position: absolute;
      top: 0;
      right: 0;
      width: 50%;
      height: 100%;
      background: repeating-linear-gradient(45deg, transparent, transparent 40px, rgba(26,95,252,0.03) 40px, rgba(26,95,252,0.03) 42px);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-size: var(--font-xl);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--text-dark);
    }
    .hero-content p {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-blue);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #0f4bd6;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(26,95,252,0.05);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 380px;
      box-shadow: var(--shadow-card);
    }

    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: var(--font-h2);
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-dark);
    }
    .section-sub {
      color: var(--neutral-gray);
      margin-bottom: 3rem;
    }

    /* 解决方案 - 不对称卡片 */
    #solution .cards-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .card-large {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      justify-content: center;
      transition: var(--transition);
    }
    .card-large:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .card-small-group {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .card-small {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .card-small:hover {
      box-shadow: var(--shadow-hover);
    }
    .icon-wrap {
      font-size: 2rem;
      color: var(--primary-blue);
      width: 48px;
      text-align: center;
    }
    .card-small:hover .icon-wrap {
      color: var(--accent-orange);
    }
    .card-text h3 {
      font-size: var(--font-h3);
      margin-bottom: 8px;
    }
    .card-text p {
      color: var(--neutral-gray);
      font-size: var(--font-small);
    }

    /* 数据看板 */
    #results {
      background: var(--dark-bg);
      color: white;
      border-radius: var(--radius-lg);
      margin: 40px 24px;
      padding: 60px 32px;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      margin-top: 2rem;
    }
    .stat-item {
      flex: 1;
      min-width: 160px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: white;
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    .stat-number span {
      font-size: 1.5rem;
      color: var(--accent-orange);
    }
    .progress-bar {
      height: 6px;
      background: rgba(255,255,255,0.2);
      border-radius: 10px;
      margin: 12px auto 8px;
      width: 80%;
    }
    .progress-fill {
      height: 100%;
      background: var(--accent-orange);
      border-radius: 10px;
      width: 0%;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .quote {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .author {
      font-weight: 600;
      color: var(--primary-blue);
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      padding: 20px;
      cursor: pointer;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: var(--neutral-gray);
      font-size: 0.9rem;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 12px;
    }
    .faq-item.active .faq-question {
      color: var(--primary-blue);
    }

    /* CTA & Footer */
    .cta-section {
      background: var(--primary-blue);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: 0;
    }
    .cta-btn-white {
      background: white;
      color: var(--primary-blue);
      border: none;
      padding: 16px 40px;
      border-radius: 40px;
      font-weight: 700;
      margin-top: 24px;
      cursor: pointer;
    }
    .footer {
      background: #1F2329;
      color: #ccc;
      padding: 40px 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    .footer a {
      color: #aaa;
      font-size: 0.9rem;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 12px;
      background: #f0f2f5;
      border: 1px solid transparent;
      border-radius: 8px;
      margin-bottom: 16px;
    }
    .contact-form input:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 4px rgba(26,95,252,0.15);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      #solution .cards-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .mobile-bottom-nav { display: flex; }
      .navbar { height: 64px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }