/* roulang page: index */
:root {
      --primary-deep: #1E1B4B;
      --accent-cyan: #00F0FF;
      --gold-star: #F5C542;
      --bg-light: #F8F9FC;
      --bg-white: #FFFFFF;
      --bg-soft: #F2F4FA;
      --text-main: #1A1A2E;
      --text-secondary: #5A5A72;
      --text-muted: #8E8EA0;
      --card-shadow: 0 4px 20px rgba(26, 26, 46, 0.06);
      --card-shadow-hover: 0 8px 30px rgba(26, 26, 46, 0.12);
      --border-light: #E8ECF2;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --sidebar-width: 240px;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      flex-direction: column;
    }
    .app-shell {
      display: flex;
      flex: 1;
    }
    /* 左侧导航 */
    .sidebar {
      width: var(--sidebar-width);
      background-color: var(--primary-deep);
      color: white;
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      z-index: 100;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.2rem;
      box-shadow: 4px 0 20px rgba(0,0,0,0.08);
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 2.5rem;
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 1px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent-cyan);
    }
    .nav-menu {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .nav-item a {
      display: flex;
      align-items: center;
      gap: 12px;
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      padding: 0.7rem 1rem;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 500;
      letter-spacing: 0.5px;
      transition: var(--transition);
      position: relative;
    }
    .nav-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-cyan);
      border-radius: 50%;
      opacity: 0.7;
      transition: var(--transition);
    }
    .nav-item a:hover {
      color: white;
      background-color: rgba(255,255,255,0.05);
    }
    .nav-item a:hover .nav-dot {
      opacity: 1;
      box-shadow: 0 0 12px var(--accent-cyan);
    }
    .main-content {
      margin-left: var(--sidebar-width);
      flex: 1;
      width: calc(100% - var(--sidebar-width));
    }
    /* 移动端导航 */
    .mobile-header {
      display: none;
      background: var(--primary-deep);
      color: white;
      padding: 0 1.2rem;
      height: 56px;
      align-items: center;
      justify-content: space-between;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 200;
    }
    .mobile-logo {
      font-size: 1.4rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .hamburger {
      font-size: 1.8rem;
      background: none;
      border: none;
      color: white;
      cursor: pointer;
    }
    .mobile-drawer {
      position: fixed;
      top: 56px;
      left: 0;
      width: 100%;
      background: var(--primary-deep);
      z-index: 199;
      display: none;
      flex-direction: column;
      padding: 1rem 1.5rem;
      box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }
    .mobile-drawer a {
      color: white;
      padding: 0.8rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      text-decoration: none;
      font-size: 16px;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    section {
      padding: 5rem 0;
    }
    h2 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 1.5rem;
      color: var(--text-main);
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-main);
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
      transition: var(--transition);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: #00D4E0;
      box-shadow: 0 6px 20px rgba(0,240,255,0.3);
      color: var(--primary-deep);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .sidebar {
        display: none;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 56px;
      }
      .mobile-header {
        display: flex;
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .container-custom {
        padding: 0 1.5rem;
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      h2 {
        font-size: 22px;
      }
      .btn-primary, .btn-outline {
        padding: 12px 24px;
        font-size: 15px;
      }
    }
    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(30,27,75,0.15);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(0,240,255,0.1) 0%, transparent 70%);
    }
    .hero-stats {
      display: flex;
      gap: 2rem;
      margin: 2rem 0;
    }
    .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--gold-star);
    }
    /* 痛点卡片 */
    .pain-card {
      background: #F2F4FA;
      border: none;
    }
    .icon-circle {
      width: 40px;
      height: 40px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }
    /* 成果展示 */
    .result-bg {
      background: linear-gradient(180deg, #F2F0FA 0%, #FFFFFF 100%);
    }
    .metric-card {
      text-align: center;
    }
    .big-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--gold-star);
    }
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-left: 4px solid var(--accent-cyan);
      font-style: italic;
    }
    .stars {
      color: var(--gold-star);
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--accent-cyan);
      color: var(--primary-deep);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 0.8rem;
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid #E8ECF2;
      margin-bottom: 8px;
    }
    .accordion-title {
      font-weight: 600;
      font-size: 16px;
      padding: 1rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      background: #F8F9FC;
      padding: 0 0 16px;
      font-size: 14px;
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    /* 终极CTA */
    .cta-dark {
      background: linear-gradient(135deg, #1E1B4B 0%, #2D2A5E 100%);
      color: white;
      text-align: center;
      padding: 4rem 2rem;
      border-radius: 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      background: #1A1A2E;
      color: #8E8EA0;
      padding: 3rem 2rem;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .process-steps {
        flex-direction: column;
        gap: 2rem;
      }
    }