:root{--bg: #f8fafc;--bg-card: #ffffff;--text: #0f172a;--text-secondary: #64748b;--border: #e2e8f0;--accent: #3b82f6;--accent-hover: #2563eb;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--sidebar-width: 240px;--transition: .2s ease}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.admin-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--text);color:#fff;padding:1.5rem;position:fixed;top:0;left:0;bottom:0;overflow-y:auto}.sidebar-logo{font-size:1.25rem;font-weight:700;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-logo a{color:#fff;text-decoration:none}.sidebar-nav{display:flex;flex-direction:column;gap:.25rem}.sidebar-nav a{display:flex;align-items:center;gap:.75rem;padding:.75rem 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var(--transition)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:#dc2626}.btn-sm{padding:.375rem .75rem;font-size:.8125rem}.btn-icon{padding:.5rem;background:transparent;color:var(--text-secondary)}.btn-icon:hover{background:var(--bg);color:var(--text)}.form-group{margin-bottom:1.5rem}.form-label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.5rem}.form-label .required{color:var(--danger)}.form-input,.form-textarea,.form-select{width:100%;padding:.75rem 1rem;font-size:.9375rem;border:1px solid var(--border);border-radius:8px;background:var(--bg-card);color:var(--text);transition:border-color var(--transition),box-shadow 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img{width:100%;height:100%;object-fit:cover}.image-preview .placeholder{color:var(--text-secondary);font-size:.875rem}.table-actions{display:flex;gap:.5rem}.exhibition-thumb{width:80px;height:60px;border-radius:6px;object-fit:cover}.form-actions{display:flex;gap:1rem;padding-top:1rem;border-top:1px solid var(--border);margin-top:2rem}.alert{padding:1rem 1.25rem;border-radius:8px;margin-bottom:1.5rem;font-size:.9375rem}.alert-success{background:#dcfce7;color:#166534;border:1px solid #86efac}.alert-error{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}.alert-info{background:#dbeafe;color:#1e40af;border:1px solid #93c5fd}.empty-state{text-align:center;padding:4rem 2rem;color:var(--text-secondary)}.empty-state svg{width:64px;height:64px;margin-bottom:1rem;opacity:.5}.empty-state h3{font-size:1.125rem;color:var(--text);margin:0 0 .5rem}.empty-state p{margin:0 0 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