/* roulang page: index */
:root {
      --primary-deep-violet: #5B2C8E;
      --primary-electric-orange: #FF6B2B;
      --bg-deep-dark: #0C0C14;
      --card-glass-bg: rgba(255, 255, 255, 0.03);
      --text-white: #F0F0F5;
      --text-gray: #A0A0B8;
      --success-green: #00E676;
      --gradient-btn: linear-gradient(135deg, #5B2C8E 0%, #8A4FFF 100%);
      --gradient-cta-light: linear-gradient(90deg, transparent, #FF6B2B, #5B2C8E, transparent);
      --glass-border: linear-gradient(135deg, rgba(255,107,43,0.3), rgba(91,44,142,0.3));
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 16px 48px rgba(91,44,142,0.25);
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-deep-dark);
      color: var(--text-white);
      font-family: var(--font-inter);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      padding: 16px 0;
    }
    .nav.scrolled {
      background: rgba(12, 12, 20, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid rgba(255,107,43,0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: white;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      text-decoration: none;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, #FF6B2B, #5B2C8E);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-gray);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-electric-orange);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-electric-orange);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(12, 12, 20, 0.95);
      backdrop-filter: blur(24px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      border-top: 1px solid rgba(255,107,43,0.3);
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      text-decoration: none;
      border-left: 3px solid var(--primary-electric-orange);
      padding-left: 16px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 20% 30%, #2a1040 0%, #0C0C14 70%);
      overflow: hidden;
    }
    .hero-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: white;
    }
    .hero .subtitle {
      font-size: 18px;
      color: #C0C0D0;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gradient-btn);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--border-radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(91,44,142,0.8);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-electric-orange);
      color: var(--primary-electric-orange);
      padding: 14px 32px;
      border-radius: var(--border-radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(255,107,43,0.1);
    }
    .hero-visual {
      flex: 1;
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.05);
      padding: 20px;
      box-shadow: 0 20px 40px rgba(91,44,142,0.2);
      display: flex;
      justify-content: center;
      align-items: center;
      height: 320px;
    }
    .hero-visual img {
      max-width: 100%;
      border-radius: 16px;
      opacity: 0.9;
    }
    /* sections */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: white;
    }
    .section-desc {
      color: var(--text-gray);
      margin-bottom: 48px;
    }
    /* 交错图文 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 80px;
      margin-bottom: 80px;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(255,107,43,0.2);
    }
    .adv-img img {
      width: 100%;
      display: block;
    }
    .adv-text {
      flex: 1;
    }
    .adv-text h3 {
      font-size: 26px;
      margin-bottom: 16px;
    }
    /* 服务网格 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .service-card:hover {
      border-color: rgba(255,107,43,0.5);
      box-shadow: 0 16px 40px rgba(91,44,142,0.25);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 28px;
      color: var(--primary-electric-orange);
      margin-bottom: 16px;
    }
    /* 数据条 */
    .stats-band {
      background: #0a0a18;
      padding: 60px 0;
    }
    .stats-flex {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .stat-item .number {
      font-size: 56px;
      font-weight: 800;
      font-family: 'Inter', sans-serif;
      color: var(--primary-electric-orange);
      text-shadow: 0 0 20px rgba(255,107,43,0.6);
    }
    /* 案例滑动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: rgba(20,20,30,0.6);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    /* 时间轴 */
    .timeline {
      position: relative;
      padding-left: 40px;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 20px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, #FF6B2B, #5B2C8E);
    }
    .timeline-item {
      display: flex;
      gap: 32px;
      margin-bottom: 48px;
      position: relative;
    }
    .timeline-dot {
      width: 16px;
      height: 16px;
      background: var(--primary-electric-orange);
      border-radius: 50%;
      box-shadow: 0 0 12px #FF6B2B;
      margin-top: 6px;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 12px;
      padding: 18px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      margin-top: 12px;
      color: #b0b0c0;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .final-cta {
      background: linear-gradient(90deg, #2a1040, #0c0c14, #2a1040);
      position: relative;
      text-align: center;
      padding: 100px 0;
    }
    .footer {
      background: #08080f;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .hero h1 { font-size: 36px; }
      .advantage-row, .advantage-row.reverse { flex-direction: column; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-flex { flex-wrap: wrap; gap: 30px; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn-group { flex-direction: column; width: 100%; }
    }