/* roulang page: index */
:root {
      --deep-space: #0B1A2F;
      --star-silver: #C0CCD8;
      --starlight-orange: #F39C12;
      --moon-white: #F5F7FA;
      --ink-black: #1A2332;
      --text-secondary: #4A5568;
      --aurora-green: #2E7D32;
      --card-shadow: 0 4px 20px rgba(11,26,47,0.06), 0 1px 3px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 30px rgba(11,26,47,0.12);
      --border-light: #E2E8F0;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-eng: "Inter", "SF Pro Text", -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--moon-white);
      color: var(--text-secondary);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      font-weight: 600;
    }
    a {
      color: inherit;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--starlight-orange);
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .navbar-custom {
      height: 56px;
      background-color: rgba(11,26,47,0.94);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .nav-left {
      width: 40%;
      display: flex;
      align-items: center;
      padding-left: 24px;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
      margin-right: 32px;
      white-space: nowrap;
    }
    .logo i {
      color: var(--starlight-orange);
      margin-right: 6px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
    }
    .nav-links a {
      color: var(--star-silver);
      font-size: 14px;
      font-weight: 500;
      text-decoration: none;
      transition: 0.2s;
    }
    .nav-links a:hover {
      color: var(--starlight-orange);
    }
    .nav-right {
      width: 60%;
      display: flex;
      justify-content: flex-end;
      align-items: center;
      padding-right: 24px;
      gap: 20px;
    }
    .search-icon {
      color: var(--star-silver);
      font-size: 18px;
      cursor: pointer;
    }
    .btn-primary-custom {
      background-color: var(--starlight-orange);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 14px;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background-color: #E67E22;
      box-shadow: 0 4px 12px rgba(243,156,18,0.3);
      color: white;
    }
    .navbar-toggler {
      border: none;
      color: white;
      font-size: 24px;
    }
    .mobile-menu {
      display: none;
    }
    /* Hero 分屏 */
    .hero-split {
      display: flex;
      height: 100vh;
      min-height: 600px;
      margin-top: 56px;
    }
    .hero-left {
      width: 45%;
      background-color: var(--deep-space);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0 48px;
    }
    .hero-content h1 {
      font-size: 32px;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--star-silver);
      margin-bottom: 32px;
    }
    .hero-right {
      width: 55%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,26,47,0.4) 0%, transparent 30%);
    }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section h2 {
      font-size: 28px;
      color: var(--deep-space);
      margin-bottom: 16px;
      font-weight: 600;
    }
    /* 核心优势错位 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 56px;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-icon {
      font-size: 48px;
      color: var(--starlight-orange);
      width: 80px;
      text-align: center;
    }
    .adv-text h3 {
      font-size: 20px;
      color: var(--ink-black);
      margin-bottom: 12px;
    }
    /* 功能分组 */
    .feature-group {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .feature-group.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      width: 50%;
      border-radius: 16px;
      object-fit: cover;
      box-shadow: var(--card-shadow);
    }
    .feature-list {
      list-style: none;
      padding-left: 0;
    }
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .feature-list i {
      color: var(--starlight-orange);
      font-size: 14px;
    }
    .btn-outline-custom {
      border: 2px solid var(--star-silver);
      background: transparent;
      color: var(--ink-black);
      padding: 10px 28px;
      border-radius: 8px;
      font-weight: 600;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline-custom:hover {
      border-color: var(--starlight-orange);
      color: var(--starlight-orange);
    }
    /* 场景卡片不等高 */
    .scenario-cards {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .scenario-card {
      background: white;
      border-radius: 12px;
      box-shadow: var(--card-shadow);
      overflow: hidden;
      flex: 1;
      transition: 0.25s ease;
    }
    .scenario-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-2px);
    }
    .scenario-card:nth-child(2) {
      margin-top: 20px;
    }
    .scenario-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }
    .scenario-body {
      padding: 24px;
    }
    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: 12px;
      padding: 28px;
      box-shadow: var(--card-shadow);
      text-align: center;
    }
    .client-logo {
      width: 64px;
      height: 64px;
      background: #EDF2F7;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--deep-space);
      font-weight: bold;
    }
    .metrics {
      display: flex;
      justify-content: center;
      gap: 48px;
      margin: 32px 0;
    }
    .metric-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--aurora-green);
      font-family: var(--font-eng);
    }
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: white;
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--ink-black);
      background: white;
      box-shadow: none;
      padding: 16px 20px;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: var(--moon-white);
      border-left: 3px solid var(--starlight-orange);
      color: var(--ink-black);
    }
    .accordion-custom .accordion-body {
      color: var(--text-secondary);
      padding: 12px 20px 20px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B1A2F 0%, #1A2F44 100%);
      padding: 64px 0;
      text-align: center;
    }
    .cta-banner h2 {
      color: white;
    }
    .footer {
      background: var(--deep-space);
      color: var(--star-silver);
      padding: 48px 0 24px;
    }
    .footer a {
      color: var(--star-silver);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--starlight-orange);
    }
    @media (max-width: 768px) {
      .hero-split {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      .hero-right {
        height: 40vh;
      }
      .nav-left {
        width: auto;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .feature-group, .advantage-row {
        flex-direction: column !important;
      }
      .scenario-cards {
        flex-direction: column;
      }
      .scenario-card:nth-child(2) {
        margin-top: 0;
      }
      h1 { font-size: 26px; }
      h2 { font-size: 22px; }
    }