/* roulang page: index */
:root {
      --primary: #1A3C5E;
      --accent: #F15A40;
      --accent-hover: #E04930;
      --bg-warm: #FAF9F7;
      --card-bg: #FFFFFF;
      --text-main: #2C2C2C;
      --text-sub: #5A5A5A;
      --text-link: #1A3C5E;
      --success: #2E7D5A;
      --border-light: #E8E5E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-sm: 0 2px 12px rgba(26,60,94,0.06);
      --shadow-md: 0 8px 24px rgba(26,60,94,0.10);
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
      --transition: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-main);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--primary);
      margin: 0 0 0.5rem;
    }
    
    h1 {
      font-size: 44px;
      line-height: 1.2;
    }
    
    h2 {
      font-size: 32px;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    
    h3 {
      font-size: 20px;
      line-height: 1.4;
      color: var(--text-main);
    }
    
    .number-font {
      font-family: var(--font-number);
      font-weight: 600;
    }
    
    a {
      color: var(--text-link);
      text-decoration: none;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      padding: 0.75rem 0;
    }
    
    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-main);
      position: relative;
      padding: 0.25rem 0;
      font-weight: 500;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 0.6rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 500;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 10px rgba(241,90,64,0.2);
      transition: var(--transition);
      position: relative;
    }
    
    .nav-cta:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(241,90,64,0.3);
      color: white !important;
    }
    
    .badge-dot {
      width: 8px;
      height: 8px;
      background: white;
      border-radius: 50%;
      display: inline-block;
      margin-right: 4px;
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    
    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAF9F7 0%, #F0EDE8 100%);
      padding: 6rem 0 3rem;
      margin-top: 70px;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    
    .hero-text {
      flex: 5;
    }
    
    .hero-text h1 {
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-sub);
      margin-bottom: 2rem;
      max-width: 450px;
    }
    
    .hero-image {
      flex: 7;
      position: relative;
    }
    
    .hero-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }
    
    .decor-line {
      position: absolute;
      top: -12px;
      right: -12px;
      width: 100%;
      height: 100%;
      border: 2px solid rgba(26,60,94,0.08);
      border-radius: 20px;
      z-index: -1;
    }
    
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-top: 1.5rem;
      font-size: 0.9rem;
      color: var(--text-sub);
    }
    
    .trust-badge i {
      color: var(--success);
    }
    
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      letter-spacing: 1px;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(241,90,64,0.25);
    }
    
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(241,90,64,0.35);
      color: white;
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      display: inline-block;
      transition: var(--transition);
      cursor: pointer;
    }
    
    .btn-outline:hover {
      background: rgba(241,90,64,0.08);
      color: var(--accent-hover);
    }
    
    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    
    /* 痛点卡片 */
    .pain-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    
    .pain-card {
      flex: 1 1 280px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }
    
    .pain-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    
    .pain-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    
    /* 解决方案左文右图 */
    .solution-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    
    .solution-text {
      flex: 1 1 400px;
    }
    
    .solution-image {
      flex: 1 1 400px;
    }
    
    .check-list {
      list-style: none;
      padding: 0;
    }
    
    .check-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 1.2rem;
      font-size: 1.05rem;
    }
    
    .check-list i {
      color: var(--success);
      font-size: 1.3rem;
      margin-top: 3px;
    }
    
    /* 优势四列 */
    .adv-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      justify-content: center;
    }
    
    .adv-card {
      flex: 1 1 220px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    
    .adv-icon {
      font-size: 2.8rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }
    
    /* 成果数据 */
    .results-bg {
      background: linear-gradient(145deg, #EEF2F6 0%, #E6EDF4 100%);
      border-radius: 24px;
      padding: 2.5rem 1.5rem;
    }
    
    .stats-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
    }
    
    .stat-item h3 {
      font-size: 2.8rem;
      color: var(--accent);
      margin-bottom: 0.25rem;
    }
    
    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    
    .testimonial-card {
      flex: 1 1 300px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    
    .quote-mark {
      font-size: 3rem;
      color: var(--accent);
      opacity: 0.5;
      position: absolute;
      top: 10px;
      left: 20px;
      font-family: serif;
    }
    
    .testimonial-text {
      font-style: italic;
      margin: 1rem 0;
    }
    
    .author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 1.2rem;
    }
    
    .author img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.5rem;
    }
    
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.2rem 0;
      cursor: pointer;
      font-weight: 500;
      font-size: 1.1rem;
    }
    
    .faq-q-badge {
      background: var(--accent);
      color: white;
      width: 28px;
      height: 28px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 6px;
      margin-right: 12px;
      font-weight: 700;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F7F5F2;
      border-radius: 8px;
      margin-bottom: 0.5rem;
    }
    
    .faq-answer.open {
      max-height: 300px;
      padding: 20px;
    }
    
    /* CTA 终局 */
    .cta-section {
      background: linear-gradient(135deg, #1A3C5E 0%, #0F2A44 100%);
      border-radius: 24px;
      padding: 4rem 2rem;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    
    .cta-section h2 {
      color: white;
    }
    
    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 2rem;
    }
    
    /* 页脚 */
    .footer {
      background: #1A2B3C;
      color: #B0BEC5;
      padding: 3rem 0 0;
    }
    
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: space-between;
    }
    
    .footer-col {
      flex: 1 1 180px;
    }
    
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      margin-bottom: 0.8rem;
    }
    
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 12px;
      color: #B0BEC5;
      transition: var(--transition);
    }
    
    .social-icons i:hover {
      color: var(--accent);
    }
    
    .copyright {
      background: #152333;
      text-align: center;
      padding: 1.2rem;
      font-size: 0.85rem;
      margin-top: 2.5rem;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column-reverse; }
      .hero-text, .hero-image { flex: 1 1 auto; }
      .pain-grid, .adv-grid, .testimonial-grid { flex-direction: column; }
    }
    
    @media (max-width: 640px) {
      h1 { font-size: 28px; }
      h2 { font-size: 24px; }
      .section { padding: 50px 0; }
      .btn-primary { padding: 12px 24px; }
    }
    
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 2rem;
      box-shadow: var(--shadow-md);
      z-index: 99;
    }
    
    .mobile-menu a {
      padding: 0.8rem 0;
      border-bottom: 1px solid var(--border-light);
    }