:root{--primary: #10b981;--primary-dark: #059669;--bg-dark: #0f172a;--bg-card: #1e293b;--bg-input: #334155;--text-primary: #f8fafc;--text-secondary: #94a3b8;--danger: #ef4444;--warning: #f59e0b;--success: #10b981;--info: #3b82f6}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-dark);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}#app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);padding:1rem 1.5rem;position:sticky;top:0;z-index:100;display:flex;justify-content:space-between;align-items:center}.app-header h1{font-size:1.25rem;font-weight:600;display:flex;align-items:center;gap:.5rem}.header-btn{background:#fff3;border:none;color:#fff;width:40px;height:40px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem}.app-content{flex:1;padding:1rem;padding-bottom:80px}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.75rem;margin-bottom:1.5rem}.stat-card{background:var(--bg-card);border-radius:12px;padding:1rem;text-align:center}.stat-card .number{font-size:1.75rem;font-weight:700;color:var(--primary)}.stat-card .label{font-size:.75rem;color:var(--text-secondary);margin-top:.25rem}.stat-card.danger .number{color:var(--danger)}.stat-card.warning .number{color:var(--warning)}.stat-card.info .number{color:var(--info)}.search-box{background:var(--bg-input);border-radius:12px;padding:.75rem 1rem;display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.search-box input{flex:1;background:none;border:none;color:var(--text-primary);font-size:1rem;outline:none}.search-box input::placeholder{color:var(--text-secondary)}.item-card{background:var(--bg-card);border-radius:12px;padding:1rem;margin-bottom:.75rem;display:flex;justify-content:space-between;align-items:center}.item-card .info h3{font-size:.95rem;font-weight:600;margin-bottom:.25rem}.item-card .info p{font-size:.8rem;color:var(--text-secondary)}.item-card .stock{text-align:right}.item-card .stock .cantidad{font-size:1.5rem;font-weight:700}.item-card .stock .label{font-size:.7rem;color:var(--text-secondary)}.item-card.critico{border-left:3px solid var(--danger)}.item-card.critico .stock .cantidad{color:var(--danger)}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);display:flex;justify-content:space-around;padding:.75rem 0;border-top:1px solid rgba(255,255,255,.1)}.nav-item{display:flex;flex-direction:column;align-items:center;color:var(--text-secondary);text-decoration:none;font-size:.7rem;gap:.25rem;cursor:pointer;background:none;border:none}.nav-item.active{color:var(--primary)}.nav-item svg{width:24px;height:24px}.filters{display:flex;gap:.5rem;margin-bottom:1rem;overflow-x:auto;padding-bottom:.5rem}.filter-btn{background:var(--bg-input);border:none;color:var(--text-secondary);padding:.5rem 1rem;border-radius:20px;font-size:.85rem;white-space:nowrap;cursor:pointer}.filter-btn.active{background:var(--primary);color:#fff}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-secondary)}.empty-state svg{width:64px;height:64px;margin-bottom:1rem;opacity:.5}.loading{display:flex;justify-content:center;padding:2rem}.spinner{width:40px;height:40px;border:3px solid var(--bg-input);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-container{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;background:linear-gradient(135deg,var(--bg-dark) 0%,#1a1a2e 100%)}.login-logo{font-size:4rem;margin-bottom:1rem}.login-title{font-size:1.5rem;font-weight:700;margin-bottom:.5rem}.login-subtitle{color:var(--text-secondary);margin-bottom:2rem}.login-form{width:100%;max-width:320px}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.85rem;color:var(--text-secondary);margin-bottom:.5rem}.form-group input{width:100%;background:var(--bg-input);border:1px solid transparent;border-radius:10px;padding:.875rem 1rem;color:var(--text-primary);font-size:1rem;outline:none;transition:border-color .2s}.form-group input:focus{border-color:var(--primary)}.btn-primary{width:100%;background:var(--primary);color:#fff;border:none;border-radius:10px;padding:.875rem;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.error-msg{background:#ef44441a;border:1px solid var(--danger);color:var(--danger);padding:.75rem;border-radius:8px;margin-bottom:1rem;font-size:.85rem;text-align:center}@media (min-width: 768px){.stats-grid{grid-template-columns:repeat(4,1fr)}.app-content{max-width:600px;margin:0 auto}}