*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
  html { font-size: 16px; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: #1F2937;
    background: #FFFFFF;
    display: flex;
    min-height: 100vh;
    line-height: 1.6;
  }
  a { text-decoration: none; color: inherit; }
  ul { list-style: none; }
  button { border: none; cursor: pointer; font-family: inherit; }

  /* ========== Sidebar ========== */
  .sidebar {
    width: 240px;
    min-height: 100vh;
    background: #FFFFFF;
    border-right: 1px solid #F3F4F6;
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
  }

  .sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px;
    margin-bottom: 28px;
  }

  .logo-icon {
    width: 32px;
    height: 32px;
    position: relative;
    flex-shrink: 0;
  }

  .logo-text {
    font-size: 18px;
    font-weight: 700;
    color: #1F2937;
    letter-spacing: -0.5px;
  }

  .nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    color: #6B7280;
    transition: all 0.2s;
    cursor: pointer;
    position: relative;
  }

  .nav-item:hover {
    background: #F9FAFB;
    color: #374151;
  }

  .nav-item.active {
    background: #EFF6FF;
    color: #2563EB;
    font-weight: 500;
  }

  .nav-item img {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.7;
  }

  .nav-item.active svg {
    opacity: 1;
  }

  .nav-badge {
    position: absolute;
    right: 12px;
    background: #EF4444;
    color: #FFFFFF;
    font-size: 10px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 10px;
    line-height: 1.6;
  }

  .sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .btn-login {
    width: 100%;
    padding: 12px;
    background: #1A1A1A;
    color: #FFFFFF;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    transition: background 0.2s;
    border: none;
  }

  .btn-login:hover {
    background: #333333;
  }

  .btn-register {
    width: 100%;
    padding: 12px;
    background: #FFFFFF;
    color: #1A1A1A;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s;
    border: 1px solid #E5E5E5;
    border-radius: 8px;
  }

  .btn-register:hover {
    background: #F9FAFB;
    border-color: #D1D5DB;
  }

  /* ========== Auth Modal ========== */
  .auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
  }

  .auth-modal-overlay.active {
    opacity: 1;
    visibility: visible;
  }

  .auth-modal {
    background: #FFFFFF;
    border-radius: 16px;
    width: 400px;
    max-width: 90vw;
    padding: 32px 28px 28px;
    position: relative;
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s;
  }

  .auth-modal-overlay.active .auth-modal {
    transform: scale(1) translateY(0);
  }

  .auth-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #999999;
    font-size: 20px;
    transition: color 0.2s;
  }

  .auth-modal-close:hover {
    color: #666666;
  }

  .auth-modal-header {
    text-align: center;
    margin-bottom: 24px;
  }

  .auth-modal-title {
    font-size: 22px;
    font-weight: 700;
    color: #1A1A1A;
    margin-bottom: 8px;
  }

  .auth-modal-subtitle {
    font-size: 14px;
    color: #999999;
  }

  /* Auth Tabs */
  .auth-tabs {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 28px;
    border-bottom: 1px solid #F0F0F0;
  }

  .auth-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    font-size: 14px;
    color: #999999;
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
    background: none;
    border: none;
    white-space: nowrap;
  }

  .auth-tab:hover {
    color: #666666;
  }

  .auth-tab.active {
    color: #1A1A1A;
    font-weight: 500;
  }

  .auth-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: #1A1A1A;
  }

  .auth-tab svg {
    width: 18px;
    height: 18px;
  }

  .auth-tab.wechat.active::after {
    background: #07C160;
  }

  .auth-tab.wechat.active {
    color: #07C160;
  }

  /* Auth Content */
  .auth-content {
    display: none;
  }

  .auth-content.active {
    display: block;
  }

  /* WeChat Login */
  .wechat-login-content {
    text-align: center;
    padding: 20px 0;
  }

  .wechat-icon-large {
    width: 80px;
    height: 80px;
    background: #E8F5E9;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
  }

  .wechat-icon-large svg {
    width: 48px;
    height: 48px;
  }

  .btn-wechat-login {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px;
    background: #07C160;
    color: #FFFFFF;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    border: none;
  }

  .btn-wechat-login:hover {
    background: #06AD56;
  }

  .btn-wechat-login svg {
    width: 22px;
    height: 22px;
  }

  .wechat-helper {
    margin-top: 16px;
    font-size: 13px;
    color: #999999;
    line-height: 1.6;
  }

  /* Phone Login Form */
  .auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .form-label {
    font-size: 14px;
    color: #333333;
    font-weight: 500;
  }

  .form-label .required {
    color: #EF4444;
  }

  .form-input {
    padding: 12px 14px;
    border: 1px solid #E5E5E5;
    border-radius: 8px;
    font-size: 14px;
    color: #1A1A1A;
    transition: border-color 0.2s;
    outline: none;
  }

  .form-input::placeholder {
    color: #CCCCCC;
  }

  .form-input:focus {
    border-color: #1A1A1A;
  }

  .form-hint {
    font-size: 12px;
    color: #999999;
  }

  .btn-submit {
    width: 100%;
    padding: 14px;
    background: #1A1A1A;
    color: #FFFFFF;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    border: none;
    margin-top: 8px;
  }

  .btn-submit:hover {
    background: #333333;
  }

  .form-footer-text {
    text-align: center;
    font-size: 13px;
    color: #999999;
    margin-top: 12px;
  }

  /* Agreement */
  .auth-agreement {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 20px;
    font-size: 13px;
    color: #666666;
  }

  .auth-agreement input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-top: 2px;
    accent-color: #1A1A1A;
  }

  .auth-agreement a {
    color: #1A1A1A;
    text-decoration: underline;
  }

  .auth-agreement a:hover {
    color: #333333;
  }

  /* ========== Main Content ========== */
  .main-content {
    margin-left: 220px;
    flex: 1;
    min-height: 100vh;
  }

  .container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 40px;
  }

  /* ========== Hero Section ========== */
  .hero {
    text-align: center;
    padding: 60px 0 48px;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #F3F4F6;
    color: #6B7280;
    font-size: 12px;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 32px;
  }

  .hero-badge svg {
    width: 14px;
    height: 14px;
  }

  .hero-logo {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
  }

  .hero-brand {
    font-size: 42px;
    font-weight: 800;
    color: #1F2937;
    letter-spacing: -1px;
    margin-bottom: 12px;
  }

  .hero-title {
    font-size: 20px;
    font-weight: 600;
    color: #1F2937;
    margin-bottom: 8px;
  }

  .hero-subtitle {
    font-size: 14px;
    color: #9CA3AF;
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.7;
  }

  /* ========== Stats Section ========== */
  .stats {
    padding: 0 0 56px;
  }

  .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .stat-card {
    background: #FFFFFF;
    border: 1px solid #F3F4F6;
    border-radius: 12px;
    padding: 24px 20px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s;
  }

  .stat-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  }

  .stat-number {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
  }

  .stat-number.green { color: #10B981; }
  .stat-number.yellow { color: #F59E0B; }
  .stat-number.pink { color: #EC4899; }
  .stat-number.blue { color: #3B82F6; }

  .stat-label {
    font-size: 13px;
    color: #9CA3AF;
  }

  /* ========== Services Section ========== */
  .services {
    padding: 0 0 56px;
  }

  .section-header {
    text-align: center;
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 22px;
    font-weight: 700;
    color: #1F2937;
    margin-bottom: 8px;
  }

  .section-subtitle {
    font-size: 14px;
    color: #9CA3AF;
  }

  .services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .service-card {
    display: flex;
    gap: 16px;
    padding: 24px;
    background: #FFFFFF;
    border: 1px solid #F3F4F6;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s;
  }

  .service-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  }

  .service-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .service-icon svg {
    width: 22px;
    height: 22px;
  }

  .service-icon.green { background: #ECFDF5; color: #10B981; }
  .service-icon.blue { background: #EFF6FF; color: #3B82F6; }
  .service-icon.pink { background: #FDF2F8; color: #EC4899; }
  .service-icon.orange { background: #FFF7ED; color: #F97316; }

  .service-info h3 {
    font-size: 15px;
    font-weight: 600;
    color: #1F2937;
    margin-bottom: 6px;
  }

  .service-info p {
    font-size: 13px;
    color: #9CA3AF;
    line-height: 1.6;
  }

  /* ========== CTA Section ========== */
  .cta {
    padding: 0 0 80px;
  }

  .cta-box {
    background: linear-gradient(135deg, #111827 0%, #1F2937 100%);
    border-radius: 20px;
    padding: 48px 40px;
    text-align: center;
  }

  .cta-title {
    font-size: 22px;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 10px;
  }

  .cta-subtitle {
    font-size: 14px;
    color: #9CA3AF;
    margin-bottom: 28px;
    max-width: 460px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
  }

  .cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #FFFFFF;
    color: #1F2937;
    font-size: 15px;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 10px;
    transition: all 0.2s;
  }

  .cta-btn:hover {
    background: #F9FAFB;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  }

  .cta-btn svg {
    width: 18px;
    height: 18px;
  }

  .mobile-header { display: none; position: fixed; top: 0; left: 0; right: 0; height: 56px; background: #FFFFFF; border-bottom: 1px solid #F0F0F0; align-items: center; justify-content: space-between; padding: 0 16px; z-index: 90; }
  .mobile-header-logo { display: flex; align-items: center; gap: 8px; order: 1; }
  .mobile-header-logo .logo-icon { width: 28px; height: 28px; }
  .mobile-header-logo .logo-text { font-size: 16px; font-weight: 700; color: #1F2937; }
  .hamburger { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; cursor: pointer; border-radius: 8px; order: 2; }
  .hamburger:hover { background: #F5F5F5; }
  .hamburger svg { width: 22px; height: 22px; color: #374151; }
  .sidebar-overlay { display: none; }

  /* ========== Responsive ========== */
  @media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); transition: transform 0.3s; z-index: 200; }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 20px 16px; padding-top: 72px; }
    .container { padding: 0 16px; }
    .hero { padding: 40px 0 32px; }
    .hero-brand { font-size: 32px; }
    .hero-title { font-size: 18px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat-number { font-size: 24px; }
    .services-grid { grid-template-columns: 1fr; }
    .cta-box { padding: 32px 24px; }
    .cta-title { font-size: 18px; }
    .mobile-header { display: flex; }
    .sidebar-overlay.open { display: block; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 150; }
  }