/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    
    :root {
      --primary: #7C3AED;
      --primary-dark: #6D28D9;
      --secondary: #06D6A0;
      --secondary-light: rgba(6, 214, 160, 0.12);
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --dark-bg: #1E1E24;
      --text-main: #111827;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --border: #E5E7EB;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -5px rgba(0,0,0,0.04);
      --shadow-nav: 0 4px 20px rgba(0,0,0,0.06);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
      width: 100%;
    }

    /* 卡片化导航面板 */
    .nav-panel {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: 1280px;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      border-radius: var(--radius-lg);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      transition: box-shadow 0.3s, background 0.3s;
    }

    .nav-panel.scrolled {
      box-shadow: 0 8px 30px rgba(0,0,0,0.1);
      background: rgba(255,255,255,0.98);
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .nav-item {
      background: transparent;
      border: none;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
      white-space: nowrap;
    }
    .nav-item i {
      font-size: 18px;
      color: var(--primary);
    }
    .nav-item:hover {
      background: rgba(124,58,237,0.08);
      color: var(--primary);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.25s, transform 0.15s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid var(--border);
      padding: 8px 20px;
      z-index: 1000;
      justify-content: space-between;
      align-items: center;
      height: 64px;
    }
    .mobile-menu-btn {
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
    }
    .mobile-menu-panel {
      position: fixed;
      bottom: 64px;
      left: 0;
      width: 100%;
      background: white;
      border-radius: 24px 24px 0 0;
      box-shadow: 0 -10px 30px rgba(0,0,0,0.1);
      padding: 24px;
      display: none;
      flex-direction: column;
      gap: 16px;
      z-index: 999;
    }
    .mobile-menu-panel.active {
      display: flex;
    }
    .mobile-menu-panel a {
      font-size: 18px;
      font-weight: 500;
      padding: 10px 0;
      border-bottom: 1px solid var(--border);
      color: var(--text-main);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--bg);
      position: relative;
      overflow: hidden;
      padding-top: 120px;
      padding-bottom: 60px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text {
      max-width: 600px;
    }
    h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin: 0 0 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 36px;
    }
    .hero-graphic {
      position: relative;
      width: 100%;
      height: 500px;
    }
    .abstract-shape {
      position: absolute;
      right: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 500"><polygon points="450,50 580,200 520,380 300,450 120,320 80,150 200,20" fill="none" stroke="%237C3AED" stroke-width="2" opacity="0.25"/><polyline points="100,400 250,300 400,350 550,200" fill="none" stroke="%2306D6A0" stroke-width="2" opacity="0.2"/><circle cx="480" cy="120" r="8" fill="%237C3AED" opacity="0.3"/></svg>') no-repeat center/contain;
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0px); }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-body);
      margin-bottom: 48px;
      max-width: 700px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: rgba(124,58,237,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-body);
      font-size: 15px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 12px;
    }

    .footer {
      background: var(--dark-bg);
      color: #D1D5DB;
      padding: 60px 0 30px;
    }
    .footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-graphic { height: 300px; }
      .grid-3 { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-panel { display: none; }
      .mobile-nav { display: flex; }
      section { padding: 80px 0; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      h1 { font-size: 36px; }
    }
    @media (prefers-reduced-motion: reduce) {
      .abstract-shape { animation: none; }
    }