/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-glow: rgba(0, 230, 118, 0.5);
      --secondary: #0A1128;
      --accent: #FFB300;
      --surface: rgba(255, 255, 255, 0.03);
      --surface-hover: rgba(255, 255, 255, 0.06);
      --border: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(255, 255, 255, 0.2);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8C8;
      --text-muted: #6B7280;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-container: 24px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--secondary);
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--secondary);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 17, 40, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      color: var(--primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      gap: 12px;
      align-items: center;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
      cursor: pointer;
      font-family: var(--font-sans);
      white-space: nowrap;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 22px;
      font-size: 15px;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
      box-shadow: 0 0 16px rgba(0,230,118,0.2);
    }
    .btn-primary {
      background: var(--primary);
      color: #0A1128;
      padding: 10px 22px;
      font-size: 15px;
      border: none;
      box-shadow: 0 4px 12px rgba(0,230,118,0.3);
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px var(--primary-glow), 0 0 48px rgba(0,230,118,0.2);
      transform: translateY(-1px);
    }
    .btn-giant {
      padding: 18px 48px;
      font-size: 18px;
      border-radius: 14px;
      animation: pulse-glow 2s infinite;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 16px rgba(0,230,118,0.4); }
      50% { box-shadow: 0 0 32px rgba(0,230,118,0.7), 0 0 60px rgba(0,230,118,0.3); }
      100% { box-shadow: 0 0 16px rgba(0,230,118,0.4); }
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: white;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(10,17,40,0.95);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 8px 16px;
      justify-content: space-around;
      z-index: 999;
      border-radius: 28px 28px 0 0;
      box-shadow: 0 -8px 20px rgba(0,0,0,0.5);
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 12px;
      transition: 0.2s;
    }
    .mobile-nav-item i {
      font-size: 20px;
      margin-bottom: 4px;
    }
    .mobile-nav-item.active {
      color: var(--primary);
    }
    /* Hero */
    #hero {
      padding: 80px 0 100px;
      background: radial-gradient(circle at 30% 40%, rgba(0,230,118,0.08) 0%, transparent 60%),
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content .highlight {
      color: var(--primary);
      text-shadow: 0 0 20px var(--primary-glow);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .trust-badges {
      display: flex;
      gap: 24px;
      align-items: center;
      opacity: 0.6;
    }
    .hero-card {
      background: var(--surface);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .live-preview {
      font-family: var(--font-mono);
      color: var(--primary);
      font-weight: 600;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }
    /* 卡片网格 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--surface);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: var(--border-hover);
      background: var(--surface-hover);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 12px;
    }
    /* 两栏服务 */
    .service-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .service-row:last-child {
      margin-bottom: 0;
    }
    .service-text h3 {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
    }
    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin: 20px 0;
    }
    .tag {
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
    }
    .service-img {
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: 0 12px 30px rgba(0,0,0,0.6);
    }
    /* 数据 */
    #stats {
      background: rgba(0,0,0,0.2);
      backdrop-filter: blur(10px);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }
    /* 案例横滚 */
    .scroll-container {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) transparent;
    }
    .case-card {
      min-width: 280px;
      background: var(--surface);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-hover);
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      text-align: center;
      flex:1;
    }
    .step-circle {
      width: 60px;
      height: 60px;
      background: var(--primary);
      color: #0A1128;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 24px;
      margin: 0 auto 16px;
    }
    /* FAQ */
    .faq-item {
      background: var(--surface);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      padding: 16px 24px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.25s;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    #cta {
      background: radial-gradient(circle at center, rgba(0,230,118,0.15) 0%, transparent 70%);
    }
    /* 页脚 */
    #footer {
      background: #060c1a;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .grid-4, .stats-grid { grid-template-columns: repeat(2,1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .service-row { grid-template-columns: 1fr; gap: 30px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 16px; }
      .hero-content h1 { font-size: 32px; }
      .section-title { font-size: 28px; }
      .grid-4, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .mobile-bottom-nav { display: flex; }
      #header .nav-actions .btn-outline { display: none; }
      .steps { flex-direction: column; gap: 24px; }
    }