:root {
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent-blue: #38bdf8;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #22c55e;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Input Section */
.input-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

input {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: var(--text-primary);
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

button.primary {
    background: var(--accent-blue);
    color: var(--bg-dark);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
}

button.primary:hover {
    background: #7dd3fc;
    transform: translateY(-2px);
}

/* Inventory Grid */
.inventory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 1.5rem;
}

.sku-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 1.25rem;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s;
}

.sku-card:hover {
    transform: translateY(-4px);
    border-color: rgba(56, 189, 248, 0.4);
}

.sku-card.critical { border-left: 6px solid var(--danger); }
.sku-card.warning { border-left: 6px solid var(--warning); }
.sku-card.safe { border-left: 6px solid var(--success); }

.sku-info {
    margin-bottom: 1.5rem;
}

.sku-id {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sku-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

/* Conveyor Slots */
.conveyor {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.slot {
    flex: 1;
    background: rgba(15, 23, 42, 0.5);
    border-radius: 0.5rem;
    padding: 0.75rem 0.25rem;
    text-align: center;
    border: 1px dashed var(--glass-border);
}

.slot.active {
    border-style: solid;
    border-color: var(--accent-blue);
}

.slot-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.slot-date {
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-top: 1rem;
}

.critical .status-badge { background: rgba(239, 68, 68, 0.2); color: var(--danger); }
.warning .status-badge { background: rgba(245, 158, 11, 0.2); color: var(--warning); }
.safe .status-badge { background: rgba(34, 197, 94, 0.2); color: var(--success); }

.actions {
    display: flex;
    gap: 0.5rem;
}

button.action-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

button.action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

button.handled-btn {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    border-color: rgba(34, 197, 94, 0.2);
}

button.handled-btn:hover {
    background: rgba(34, 197, 94, 0.2);
}

/* Animations */
@keyframes slideOut {
    to { transform: translateX(-100%); opacity: 0; }
}

.shifting .slot:first-child {
    animation: slideOut 0.3s forwards;
}