/* roulang page: index */
:root {
      --color-primary: #0B0C0E;
      --color-accent: #7C3AED;
      --color-highlight: #F59E0B;
      --color-bg-light: #F8F9FB;
      --color-text-dark: #1E1E24;
      --color-text-muted: #6B7280;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "DIN Alternate", "Courier New", monospace;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-glow: 0 8px 32px rgba(124,58,237,0.15);
      --transition-base: all 0.2s ease-in-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-heading);
      background-color: #ffffff;
      color: var(--color-text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 12, 14, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(124, 58, 237, 0.2);
      transition: background 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(11, 12, 14, 0.92);
      border-bottom-color: rgba(124, 58, 237, 0.4);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      font-size: 1.6rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--color-highlight);
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--color-accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--color-highlight);
      color: #0B0C0E !important;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
    }
    .btn-nav:hover {
      background: #fbbf24;
      box-shadow: 0 6px 16px rgba(245, 158, 11, 0.5);
    }
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: 92%;
      background: rgba(88, 28, 135, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: 40px;
      padding: 10px 20px;
      z-index: 999;
      justify-content: space-around;
      box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    }
    .mobile-bottom-nav a {
      color: white;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      gap: 4px;
      opacity: 0.8;
    }
    .mobile-bottom-nav a i {
      font-size: 1.2rem;
    }
    .mobile-bottom-nav a.active {
      color: var(--color-highlight);
      opacity: 1;
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    /* Hero */
    .hero {
      height: 100vh;
      background: radial-gradient(circle at 30% 40%, #1e1035 0%, #0B0C0E 80%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-particle {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 70% 30%, rgba(124,58,237,0.15) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 10;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(to right, #c084fc, #f59e0b);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: #b0b0c0;
      letter-spacing: 2px;
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--color-highlight);
      color: #0B0C0E;
      padding: 14px 36px;
      border-radius: 8px;
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 8px 20px rgba(245,158,11,0.3);
      transition: all 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #fbbf24;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(245,158,11,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--color-accent);
      color: #c084fc;
      padding: 14px 36px;
      border-radius: 8px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(124,58,237,0.1);
      border-color: #a78bfa;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: #a78bfa;
      font-size: 1.8rem;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    }
    /* 服务非对称 */
    .service-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 60px;
      align-items: center;
    }
    .service-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(124,58,237,0.25);
    }
    .service-list {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .service-item {
      display: flex;
      gap: 20px;
      border-left: 3px solid var(--color-accent);
      padding-left: 24px;
      transition: 0.2s;
    }
    .service-item:hover {
      border-left-color: var(--color-highlight);
    }
    .service-item i {
      color: var(--color-accent);
      font-size: 1.8rem;
      width: 40px;
    }
    /* 数据带 */
    .data-strip {
      background: #1A1C20;
      padding: 60px 0;
    }
    .data-cards {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }
    .data-item .number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--color-highlight);
    }
    /* 案例交错 */
    .case-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .case-row.reverse {
      direction: rtl;
    }
    .case-row.reverse .case-text {
      direction: ltr;
    }
    .case-img img {
      border-radius: 16px;
      transition: transform 0.3s;
    }
    .case-img img:hover {
      transform: scale(1.02);
    }
    /* 流程垂直 */
    .step-block {
      display: flex;
      gap: 40px;
      margin-bottom: 50px;
      position: relative;
    }
    .step-number {
      font-size: 4.5rem;
      font-weight: 800;
      color: rgba(124,58,237,0.2);
      line-height: 1;
      min-width: 100px;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .accordion-item {
      border-bottom: 1px solid #e5e7eb;
      padding: 18px 0;
    }
    .accordion-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    /* CTA横幅 */
    .cta-banner {
      background: #0B0C0E radial-gradient(circle at center, #4c1d95 0%, #0B0C0E 70%);
      text-align: center;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 20px auto;
      gap: 12px;
    }
    .cta-form input {
      flex:1;
      padding: 14px;
      background: transparent;
      border:1px solid #7C3AED;
      border-radius: 8px;
      color: white;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: 1fr; }
      .case-row { grid-template-columns: 1fr; direction: ltr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .container { padding: 0 20px; }
      .footer-grid { grid-template-columns: 1fr; }
    }