/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --accent-orange: #FF6B35;
      --deep-indigo: #0F0A1A;
      --star-silver: #E8E6F0;
      --victory-gold: #FFB800;
      --bg-dark: #0F0A1A;
      --bg-light: #F8F7FC;
      --card-bg: rgba(255,255,255,0.04);
      --card-border: rgba(255,255,255,0.08);
      --text-primary: #E8E6F0;
      --text-secondary: #B0AEC1;
      --green-accent: #00E676;
      --gradient-main: linear-gradient(135deg, #7B2FF7 0%, #FF6B35 100%);
      --radius-card: 20px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
      --shadow-hover: 0 8px 40px rgba(123,47,247,0.25);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'DIN Alternate', 'SF Mono', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    button, input {
      font-family: inherit;
      border: none;
      outline: none;
      background: transparent;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15,10,26,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(15,10,26,0.85), rgba(15,10,26,0.85)), linear-gradient(90deg, #7B2FF7, #FF6B35);
      background-origin: border-box;
      background-clip: padding-box, border-box;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: 1px;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--star-silver);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--victory-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--victory-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--star-silver);
      transition: all 0.3s ease;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 280px;
        background: rgba(15,10,26,0.95);
        backdrop-filter: blur(25px);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: 40px;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        gap: 28px;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .nav-links a {
        font-size: 20px;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.2) 0%, rgba(15,10,26,0) 70%);
      position: relative;
      padding-top: 80px;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #E8E6F0, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--star-silver);
      margin-bottom: 40px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-main);
      color: white;
      font-weight: 600;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      box-shadow: 0 4px 15px rgba(123,47,247,0.4);
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 30px rgba(123,47,247,0.6);
    }
    .btn-ghost {
      border: 2px solid #7B2FF7;
      color: var(--star-silver);
      font-weight: 600;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-ghost:hover {
      background: var(--gradient-main);
      border-color: transparent;
      color: white;
    }
    .hero-image {
      flex: 1 1 400px;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 30px rgba(123,47,247,0.5);
      border: 2px solid rgba(255,107,53,0.4);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero-sub {
        font-size: 16px;
      }
      .hero-content {
        flex-direction: column;
        gap: 40px;
      }
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--star-silver);
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 18px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 24px;
      padding: 32px 20px;
      text-align: center;
      transition: var(--transition-smooth);
    }
    .stat-card:hover {
      border-color: rgba(123,47,247,0.4);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, #7B2FF7, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--star-silver);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .stat-number {
        font-size: 32px;
      }
    }

    /* 服务矩阵 1+2 */
    .service-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .large-card {
      grid-row: span 2;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      position: relative;
      border-left: 4px solid #7B2FF7;
      display: flex;
      flex-direction: column;
    }
    .small-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: var(--transition-smooth);
      border-left: 4px solid #FF6B35;
      display: flex;
      flex-direction: column;
    }
    .large-card:hover, .small-card:hover {
      border-color: rgba(123,47,247,0.5);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      border-radius: 16px;
      overflow: hidden;
      margin-bottom: 20px;
    }
    .card-img img {
      width: 100%;
      object-fit: cover;
    }
    .card-title {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .service-matrix {
        grid-template-columns: 1fr;
      }
      .large-card {
        grid-row: auto;
      }
    }

    /* 对比表格 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      border-radius: 20px;
      overflow: hidden;
    }
    .compare-row {
      display: contents;
    }
    .compare-cell {
      padding: 20px;
      background: rgba(255,255,255,0.03);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      font-weight: 500;
    }
    .compare-cell.highlight {
      background: linear-gradient(135deg, rgba(123,47,247,0.2), rgba(255,107,53,0.1));
      color: white;
    }
    .compare-cell.green {
      color: var(--green-accent);
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .compare-table {
        display: flex;
        flex-direction: column;
        gap: 16px;
      }
      .compare-row {
        display: flex;
        flex-direction: column;
        background: rgba(255,255,255,0.03);
        border-radius: 16px;
        padding: 16px;
      }
    }

    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      aspect-ratio: 16/9;
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(15,10,26,0.9));
      padding: 24px;
      color: white;
    }
    .case-card:hover img {
      transform: scale(1.05);
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-icon {
      font-size: 24px;
      color: #7B2FF7;
    }

    /* CTA */
    .cta-section {
      background: var(--bg-dark);
      text-align: center;
      background-image: radial-gradient(circle at center, rgba(123,47,247,0.2) 0%, transparent 70%);
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 32px auto 0;
      gap: 12px;
    }
    .cta-input {
      flex: 1;
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 50px;
      padding: 16px 24px;
      color: white;
      font-size: 16px;
    }
    .cta-input:focus {
      border-color: var(--victory-gold);
    }
    @media (max-width: 768px) {
      .cta-form {
        flex-direction: column;
        gap: 16px;
      }
    }

    /* 页脚 */
    .footer {
      background: #0A0614;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 800;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }