/* roulang page: index */
:root {
      --bg-base: #F5F6FA;
      --white: #FFFFFF;
      --deep-space: #1A1F36;
      --star-purple: #6C5CE7;
      --star-purple-dark: #5A4BD1;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-disabled: #C0C4CC;
      --border-light: #E5E8EF;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --shadow-sm: 0 2px 8px rgba(26,31,54,0.04);
      --shadow-md: 0 8px 24px rgba(26,31,54,0.08), 0 2px 4px rgba(108,92,231,0.06);
      --shadow-lg: 0 16px 48px rgba(26,31,54,0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 24px;
      --radius-tag: 8px;
      --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-base);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 48px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      transition: var(--transition);
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: none;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(16px);
      box-shadow: 0 1px 0 var(--border-light);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 48px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      color: #FFFFFF;
      transition: color 0.3s;
    }
    .header.scrolled .logo {
      color: var(--deep-space);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: rgba(255,255,255,0.9);
      transition: var(--transition);
      position: relative;
    }
    .header.scrolled .nav-links a {
      color: var(--text-primary);
    }
    .nav-links a:hover {
      color: var(--star-purple);
    }
    .nav-cta {
      background: var(--star-purple);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(108,92,231,0.3);
      transition: var(--transition);
    }
    .nav-cta:hover {
      background: var(--star-purple-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
      border-radius: 2px;
    }
    .header.scrolled .hamburger span {
      background: var(--deep-space);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-space);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 24px;
      color: white;
      font-weight: 600;
    }
    /* Hero */
    .hero {
      background: var(--deep-space);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
    }
    .particles {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 22px;
      color: #B0B8C9;
      margin-bottom: 48px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--star-purple);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(108,92,231,0.4);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--star-purple-dark);
    }
    .btn-secondary {
      background: transparent;
      color: white;
      border: 1.5px solid rgba(255,255,255,0.6);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
    }
    .btn-secondary:hover {
      background: white;
      color: var(--deep-space);
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }
    .bg-white { background: var(--white); }
    .bg-light { background: var(--bg-base); }
    .bg-dark { background: var(--deep-space); color: white; }
    
    /* 解决方案卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-left: 4px solid var(--star-purple);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-left-width: 8px;
    }
    .solution-card h3 {
      font-size: 22px;
      font-weight: 600;
    }
    .pain-point {
      color: var(--error);
      font-weight: 500;
    }
    .solution-point {
      color: var(--success);
      font-weight: 500;
    }
    /* 能力区块 */
    .capability-flex {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .capability-image {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .capability-stats {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    .stat-item {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--star-purple);
      line-height: 1;
    }
    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .tag {
      background: rgba(108,92,231,0.1);
      color: var(--star-purple);
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      font-size: 14px;
      display: inline-block;
    }
    /* 证言 */
    .testimonial blockquote {
      font-size: 28px;
      font-style: italic;
      line-height: 1.6;
      border-left: 4px solid var(--star-purple);
      padding-left: 32px;
      margin-bottom: 24px;
      color: white;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      transition: var(--transition);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 20px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    /* CTA */
    .cta-gradient {
      background: linear-gradient(135deg, #6C5CE7 0%, #1A1F36 100%);
      text-align: center;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 32px; }
      .grid-3, .cases-grid { grid-template-columns: repeat(2,1fr); }
      .capability-flex { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 30px; }
      .grid-3, .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 80px 0; }
    }