/* roulang page: index */
:root {
      --primary: #5B2C8E;
      --secondary: #D4A843;
      --bg-deep: #0F0A1A;
      --bg-card: #1A1228;
      --bg-section: #1A1228;
      --bg-footer: #08040F;
      --text-white: #FFFFFF;
      --text-body: #CBC3D9;
      --text-muted: #8A7E9B;
      --font-display: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Oswald', 'DIN Alternate', 'Bebas Neue', sans-serif;
      --radius-card: 24px;
      --radius-btn: 8px;
      --radius-input: 12px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.5);
      --shadow-hover: 0 20px 40px rgba(91,44,142,0.35), 0 4px 12px rgba(0,0,0,0.7);
      --gold-border: rgba(212,168,67,0.25);
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-display);
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background: rgba(10, 6, 18, 0.8);
      border-bottom: 1px solid rgba(212,168,67,0.15);
      transition: background 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 26px;
      color: #fff;
      background: linear-gradient(135deg, #D4A843, #FFFFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-graphic {
      display: none;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 16px;
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-links a:hover:after {
      width: 100%;
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      padding: 10px 24px;
      border-radius: 30px;
      color: #fff !important;
      font-weight: 600;
      margin-left: 8px;
      box-shadow: 0 4px 14px rgba(91,44,142,0.4);
    }
    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(91,44,142,0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.3s;
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 38px;
      font-weight: 800;
      color: #fff;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title h2:after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 2px;
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(91,44,142,0.25), transparent 60%), var(--bg-deep);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      flex: 1 1 50%;
      z-index: 2;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #e0c87c, #D4A843, #f0e6c8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 18px;
      color: #CBC3D9;
      margin: 24px 0 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #5B2C8E, #D4A843);
      border: none;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      color: white;
      font-size: 17px;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 6px 18px rgba(91,44,142,0.4);
      letter-spacing: 1px;
      display: inline-block;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #D4A843, #5B2C8E);
      transform: translateY(-3px);
      box-shadow: 0 15px 30px rgba(91,44,142,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(212,168,67,0.12);
      transform: translateY(-2px);
    }
    .hero-image {
      flex: 1 1 45%;
      position: relative;
      z-index: 1;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 25px 50px rgba(0,0,0,0.6);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
      filter: brightness(0.9);
    }
    /* Services 不对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: rgba(30, 21, 48, 0.8);
      backdrop-filter: blur(5px);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--gold-border);
      transition: var(--transition);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .service-card.large {
      grid-row: span 2;
    }
    .service-card:hover {
      transform: translateY(-8px);
      border-color: var(--secondary);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      border-radius: 20px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
      color: white;
    }
    .service-card h3 {
      font-size: 24px;
      color: white;
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: auto;
      padding-top: 20px;
    }
    .tag {
      background: rgba(212,168,67,0.12);
      color: var(--secondary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .right-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    /* 数据徽章 */
    .stats-scroll {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding: 15px 5px;
    }
    .stat-badge {
      flex: 0 0 200px;
      background: rgba(26,18,40,0.9);
      border: 2px dashed rgba(212,168,67,0.4);
      border-radius: 50%;
      width: 160px;
      height: 160px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      box-shadow: 0 8px 20px rgba(0,0,0,0.4);
      background: radial-gradient(circle at 30% 30%, rgba(91,44,142,0.3), transparent);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 44px;
      font-weight: 700;
      background: linear-gradient(180deg, #D4A843, #f7e5a3);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    /* 案例错位网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: 28px;
      overflow: hidden;
      background: #1A1228;
      min-height: 260px;
      border: 1px solid rgba(212,168,67,0.2);
    }
    .case-card.wide {
      grid-column: span 2;
    }
    .case-img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      position: absolute;
      top:0;
      left:0;
      transition: transform 0.5s;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(15,10,26,0.92));
      padding: 28px 24px;
      color: white;
    }
    .case-card:hover .case-img {
      transform: scale(1.06);
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 50px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-text {
      flex: 1;
    }
    .solution-image {
      flex: 1;
      border-radius: 30px;
      overflow: hidden;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: #1A1228;
      border-radius: 20px;
      padding: 20px 24px;
      cursor: pointer;
    }
    .question {
      font-weight: 700;
      color: #ffffffee;
      display: flex;
      justify-content: space-between;
    }
    .answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #CBC3D9;
    }
    .faq-item.active .answer {
      max-height: 140px;
      margin-top: 12px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #3a1e5c, #0f0a1a);
      text-align: center;
      border-radius: 40px;
      padding: 70px 30px;
      margin: 20px 0;
      border: 1px solid var(--secondary);
    }
    footer {
      background: #08040F;
      padding: 60px 0 20px;
      border-top: 1px solid rgba(212,168,67,0.2);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 35px;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 40px; }
      .services-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 36px; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .case-grid { grid-template-columns: 1fr; }
      .case-card.wide { grid-column: span 1; }
    }