:root{--color-primary:#2bf;--color-primary-dark:#1a9dd9;--color-primary-darker:#0d4f6e;--bg-secondary:#f5f5f5;--bg-tertiary:#e8e8e8;--text-primary:#1a1a1a;--text-secondary:#666;--text-tertiary:#999;--border-color:#ddd;--shadow:#0000001a;--color-success:#28a745;--color-warning:#ffc107;--color-danger:#dc3545;--color-info:#17a2b8;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--spacing-2xl:48px;--font-size-sm:14px;--font-size-base:16px;--font-size-lg:18px;--font-size-xl:24px;--font-size-2xl:32px;--font-size-3xl:40px;--touch-target:44px;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--transition-fast:150ms ease;--transition-base:250ms ease;--transition-slow:350ms ease}@media (prefers-color-scheme:dark){:root{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#404040;--text-primary:#f5f5f5;--text-secondary:#ccc;--text-tertiary:#999;--border-color:#404040;--shadow:#0000004d}}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{color:#1a1a1a;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;transition:background-color .25s ease,color .25s ease;transition:background-color var(--transition-base),color 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(prefers-color-scheme:dark){:root{--login-primary:#4dabf7;--login-primary-hover:#339af0;--login-secondary:#748fac;--login-bg:#1a1f2e;--login-card-bg:#232937;--login-text:#f0f4f8;--login-text-light:#a8b2c1;--login-border:#3a4252;--login-shadow:0 4px 6px #0000004d;--login-shadow-lg:0 10px 40px #0006}}.login-page{align-items:center;background:linear-gradient(135deg,#0056b3,#6c8ebf);background:linear-gradient(135deg,var(--login-primary) 0,var(--login-secondary) 100%);display:flex;justify-content:center;min-height:100vh;padding:1rem}.login-container{margin:0 auto;max-width:1200px;width:100%}.back-link{align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff1a;border-radius:6px;color:#fff;display:inline-flex;font-size:.9375rem;margin-bottom:1.5rem;padding:.5rem 1rem;text-decoration:none;transition:all 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h2{font-size:2rem}}.admin-dashboard{background:#f3f4f6;background:var(--dashboard-bg,#f3f4f6);min-height:100vh}.admin-loading{align-items:center;display:flex;flex-direction:column;gap:1rem;justify-content:center;min-height:100vh}.loading-spinner{animation:spin 1s linear infinite;border:4px solid #e5e7eb;border:4px solid var(--spinner-track,#e5e7eb);border-radius:50%;border-top:4px solid #6366f1;height:48px;width:48px}.admin-header{background:#fff;border-bottom:1px solid #e5e7eb;border-bottom:1px solid var(--border-color,#e5e7eb);box-shadow:0 1px 3px #0000001a;padding:1rem}.admin-header-content{align-items:center;display:flex;justify-content:space-between;margin:0 auto;max-width:1200px}.admin-header h1{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.5rem;margin:0}.admin-header p{color:#6b7280;color:var(--text-muted,#6b7280);font-size:.875rem;margin:.25rem 0 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#fecaca;border-radius:8px;color:#dc2626;margin-bottom:1.5rem;padding:1rem}.stats-grid{grid-gap:1rem;display:grid;gap:1rem;grid-template-columns:1fr;margin-bottom:2rem}.stat-card{background:#fff;box-shadow:0 1px 3px #0000001a;gap:1rem;padding:1.25rem}.stat-card,.stat-icon{align-items:center;border-radius:8px;display:flex}.stat-icon{font-size:2rem;height:48px;justify-content:center;width:48px}.users-icon{background:#dbeafe}.classes-icon{background:#fce7f3}.upcoming-icon{background:#e0e7ff}.bookings-icon{background:#dcfce7}.stat-content h3{color:#6b7280;color:var(--text-muted,#6b7280);font-size:.875rem;font-weight:500;margin:0 0 .25rem}.stat-number{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.75rem;font-weight:600;margin:0}.quick-actions{background:#fff;border-radius:8px;box-shadow:0 1px 3px #0000001a;margin-bottom:2rem;padding:1.5rem}.quick-actions h2{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.25rem;margin:0 0 1rem}.action-buttons{flex-direction:column;gap:.75rem}.action-button{align-items:center;border:none;border-radius:6px;cursor:pointer;display:flex;font-size:.9375rem;font-weight:500;gap:.5rem;justify-content:center;min-height:48px;padding:.875rem 1.25rem;transition:all .2s}.create-class{background:#10b981;color:#fff}.create-class:hover{background:#059669}.schedule-class{background:#6366f1;color:#fff}.schedule-class:hover{background:#4f46e5}.view-bookings{background:#f59e0b;color:#fff}.view-bookings:hover{background:#d97706}.recent-activity{grid-gap:1.5rem;display:grid;gap:1.5rem;grid-template-columns:1fr}.activity-section{background:#fff;border-radius:8px;box-shadow:0 1px 3px #0000001a;padding:1.5rem}.activity-section h2{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.125rem;margin:0 0 1rem}.activity-list{display:flex;flex-direction:column;gap:.75rem}.activity-item{align-items:start;background:#f9fafb;background:var(--activity-bg,#f9fafb);border-radius:6px;display:flex;font-size:.875rem;justify-content:space-between;padding:.75rem}.activity-info{display:flex;flex-direction:column;gap:.25rem}.activity-info strong{color:#1f2937;color:var(--text-color,#1f2937)}.activity-class,.activity-date,.activity-details,.activity-seats{color:#6b7280;color:var(--text-muted,#6b7280);font-size:.8125rem}.activity-date,.activity-seats{white-space:nowrap}.no-data{color:#6b7280;color:var(--text-muted,#6b7280);font-style:italic;padding:2rem;text-align:center}@media (prefers-color-scheme:dark){:root{--dashboard-bg:#111827;--text-color:#f3f4f6;--text-muted:#9ca3af;--border-color:#374151;--spinner-track:#374151;--nav-hover:#1f2937;--activity-bg:#1f2937}.activity-section,.admin-header,.admin-nav,.quick-actions,.stat-card{background:#1f2937}.error-banner{background:#7f1d1d;border-color:#991b1b;color:#fca5a5}}@media (min-width:640px){.stats-grid{grid-template-columns:repeat(2,1fr)}.action-buttons{flex-direction:row}.action-button{flex:1 1}}@media (min-width:768px){.admin-header h1{font-size:1.875rem}.stats-grid{grid-template-columns:repeat(4,1fr)}.recent-activity{grid-template-columns:repeat(2,1fr)}}@media (min-width:1024px){.admin-main{padding:2rem}.stat-card{padding:1.5rem}.activity-section,.quick-actions{padding:2rem}}.class-types-container{background:#f3f4f6;background:var(--dashboard-bg,#f3f4f6);min-height:100vh}.action-bar{margin-bottom:1.5rem}.add-button{background:#10b981;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:.9375rem;font-weight:500;min-height:44px;padding:.75rem 1.5rem;transition:background .2s}.add-button:hover{background:#059669}.class-form-card{background:#fff;border-radius:8px;box-shadow:0 1px 3px #0000001a;margin-bottom:2rem;padding:1.5rem}.class-form-card h2{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.25rem;margin:0 0 1.5rem}.class-form{display:flex;flex-direction:column;gap:1.5rem}.form-grid{grid-gap:1rem;gap:1rem}.form-group{gap:.5rem}.form-group label{color:#374151;color:var(--text-color,#374151);font-weight:500}.form-group input,.form-group select,.form-group textarea{background:var(--input-bg,#fff);border:1px solid #d1d5db;border:1px solid var(--border-color,#d1d5db);border-radius:6px;color:#1f2937;color:var(--text-color,#1f2937);font-size:.9375rem;padding:.625rem}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:#6366f1;box-shadow:0 0 0 3px #6366f11a}.form-group textarea{min-height:auto}.checkbox-group{align-items:center;flex-direction:row}.checkbox-group label{align-items:center;gap:.5rem}.checkbox-group input[type=checkbox]{height:18px;min-height:auto;width:18px}.form-actions{border-top:1px solid #e5e7eb;border-top:1px solid var(--border-color,#e5e7eb);justify-content:flex-end;padding-top:1rem}.cancel-button{background:#0000;border:1px solid #d1d5db;border:1px solid var(--border-color,#d1d5db);border-radius:6px;color:#6b7280;color:var(--text-muted,#6b7280);cursor:pointer;font-size:.875rem;min-height:44px;padding:.625rem 1.25rem;transition:all .2s}.cancel-button:hover{background:#f3f4f6;background:var(--hover-bg,#f3f4f6)}.submit-button{background:#6366f1;border-radius:6px;font-size:.875rem;font-weight:500;min-height:44px;padding:.625rem 1.5rem;transition:background .2s}.submit-button:hover{background:#4f46e5}.class-types-grid{grid-gap:1rem;display:grid;gap:1rem;grid-template-columns:1fr}.class-card{border-radius:8px;box-shadow:0 1px 3px #0000001a;transition:transform .2s,box-shadow .2s}.class-card:hover{box-shadow:0 4px 6px #0000001a;transform:translateY(-2px)}.class-card-header{align-items:start;border-bottom:1px solid #e5e7eb;border-bottom:1px solid var(--border-color,#e5e7eb);display:flex;justify-content:space-between}.class-card-header h3{color:#1f2937;color:var(--text-color,#1f2937);font-size:1.125rem;margin:0}.status-badge{font-weight:500}.status-badge.active{background:#dcfce7;color:#166534}.status-badge.inactive{background:#fee2e2;color:#991b1b}.class-description{color:#6b7280;color:var(--text-muted,#6b7280);font-size:.875rem;margin:0 0 1rem}.class-details{grid-gap:.5rem;display:grid;gap:.5rem;grid-template-columns:1fr}.detail-item{font-size:.875rem;justify-content:space-between}.detail-label{color:#6b7280;color:var(--text-muted,#6b7280)}.detail-value{color:#1f2937;color:var(--text-color,#1f2937);font-weight:500}.class-card-actions{background:#f9fafb;background:var(--actions-bg,#f9fafb);border-top:1px solid #e5e7eb;border-top:1px solid var(--border-color,#e5e7eb);display:flex;gap:.5rem;padding:1rem 1.25rem}.delete-button,.edit-button{border:none;border-radius:6px;cursor:pointer;flex:1 1;font-size:.875rem;font-weight:500;min-height:40px;padding:.5rem 1rem;transition:all 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