/* roulang page: index */
:root {
      --primary: #E6390C;
      --primary-hover: #C72E0A;
      --secondary-dark: #1A1A2E;
      --accent-gold: #F4A261;
      --bg-light: #FAFAFA;
      --text-dark: #1A1A2E;
      --text-muted: #5A5A72;
      --border-light: #E6E6EB;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 30px rgba(230,57,12,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: all 0.25s ease;
      --nav-width: 72px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'SF Mono', 'Courier New', monospace;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

    /* 左侧 App Shell 导航 */
    .app-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--secondary-dark);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 24px 0;
      z-index: 100;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
      transition: transform 0.3s ease;
    }

    .nav-logo {
      margin-bottom: 48px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
    }

    .nav-logo .logo-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .nav-logo .logo-text {
      font-size: 12px;
      font-weight: 700;
      color: white;
      letter-spacing: 0.5px;
      writing-mode: vertical-rl;
      text-orientation: mixed;
      font-family: var(--font-heading);
    }

    .nav-menu {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 18px;
      width: 100%;
      padding: 0 12px;
    }

    .nav-menu li a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      font-size: 11px;
      padding: 6px 4px;
      border-radius: 8px;
      transition: var(--transition);
      position: relative;
      font-weight: 500;
      letter-spacing: 0.3px;
    }

    .nav-menu li a i {
      font-size: 20px;
      margin-bottom: 4px;
    }

    .nav-menu li a:hover,
    .nav-menu li a.active {
      color: white;
      background-color: rgba(255,255,255,0.08);
    }

    .nav-menu li a.active::before {
      content: '';
      position: absolute;
      left: -8px;
      top: 8px;
      bottom: 8px;
      width: 3px;
      background-color: var(--primary);
      border-radius: 2px;
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background-color: var(--secondary-dark);
      z-index: 99;
      align-items: center;
      justify-content: space-between;
      padding: 0 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }

    .mobile-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      color: white;
      font-weight: 700;
      font-size: 18px;
      text-decoration: none;
    }

    .hamburger {
      color: white;
      font-size: 24px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .mobile-drawer {
      position: fixed;
      top: 56px;
      left: 0;
      width: 100%;
      background-color: #141428;
      padding: 24px 20px;
      display: none;
      flex-direction: column;
      gap: 16px;
      z-index: 98;
      box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }

    .mobile-drawer a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-size: 18px;
      font-weight: 500;
      padding: 8px 12px;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .mobile-drawer a:hover,
    .mobile-drawer a.active-mobile {
      color: white;
      border-left-color: var(--primary);
      background: rgba(255,255,255,0.05);
    }

    /* 主内容区域 */
    .main-content {
      margin-left: var(--nav-width);
      flex: 1;
      width: calc(100% - var(--nav-width));
      background-color: var(--bg-light);
    }

    section {
      scroll-margin-top: 0;
    }

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

    h1, h2, h3, .h2, .h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 42px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
    }

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

    .btn-primary:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,57,12,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--secondary-dark);
      border-color: var(--secondary-dark);
    }

    .btn-outline:hover {
      background: var(--secondary-dark);
      color: white;
    }

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

    .btn-light:hover {
      background: #f0f0f0;
      border-color: #f0f0f0;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1A2E 0%, #2D2D44 60%, #E6390C 180%);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      color: white;
      margin-bottom: 20px;
      font-size: 48px;
      font-weight: 800;
    }

    .hero .subtitle {
      font-size: 18px;
      color: var(--accent-gold);
      margin-bottom: 36px;
      font-weight: 500;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .speed-lines {
      position: absolute;
      right: 5%;
      top: 20%;
      width: 300px;
      height: 300px;
      opacity: 0.2;
      background: radial-gradient(circle at 30% 30%, rgba(244,162,97,0.4) 0%, transparent 70%);
      filter: blur(40px);
    }

    /* 板块通用 */
    .section-padding {
      padding: 100px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-header h2 {
      color: var(--secondary-dark);
      position: relative;
      display: inline-block;
    }

    .section-header h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 50px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      text-align: center;
      border: 1px solid transparent;
    }

    .advantage-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
      border-color: rgba(230,57,12,0.2);
    }

    .advantage-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .feature-matrix {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    .feature-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      background-color: #e9e9ef;
    }

    .feature-text {
      padding: 24px;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }

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

    .scenario-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 280px;
    }

    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-desc {
      flex: 1;
    }

    .case-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-item {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--card-shadow);
    }

    .case-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .pricing-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 36px 24px;
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: var(--transition);
      border: 2px solid transparent;
    }

    .pricing-card.recommended {
      border-color: var(--primary);
      transform: scale(1.02);
    }

    .price {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
      font-family: var(--font-number);
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 16px 0;
      font-weight: 600;
      font-size: 18px;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f4f4f9;
      border-radius: 6px;
      padding: 0 16px;
      margin-bottom: 8px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    .cta-block {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    footer {
      background: var(--secondary-dark);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .card-grid, .pricing-grid, .case-cards {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .app-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 56px;
      }
      h1 {
        font-size: 36px;
      }
      .feature-matrix, .scenario-row {
        flex-direction: column;
      }
      .card-grid, .pricing-grid, .case-cards {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }