:root {
    --color-full: #2e7d32;
    --color-in_use: #1565c0;
    --color-empty: #c62828;
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text: #1a1a1a;
    --muted: #666;
    --border: #e0e0e0;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0 1.5rem 3rem;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.page-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1.5rem 0 1rem;
}

.page-header h1 { margin: 0; font-size: 1.5rem; }
.page-header nav a { color: #1565c0; text-decoration: none; }
.page-header nav a:hover { text-decoration: underline; }

.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-weight: 500;
}
.flash--success { background: #e6f4ea; color: #1e4620; border: 1px solid #b7dfc0; }
.flash--error { background: #fdecea; color: #611a15; border: 1px solid #f3b8b3; }

.banner {
    padding: 0.9rem 1.2rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 600;
}
.banner--yellow { background: #fff8e1; color: #7a5b00; border: 1px solid #ffe082; }
.banner--red { background: #fdecea; color: #7a1410; border: 1px solid #f5a29c; }

.cabinets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.cabinet {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem;
}

.cabinet h2 {
    margin: 0 0 0.75rem;
    font-size: 1.15rem;
}
.gas-type {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    background: #546e7a;
    border-radius: 4px;
    padding: 0.1rem 0.45rem;
    margin-left: 0.4rem;
    vertical-align: middle;
}

.cylinder-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.cylinder-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.35rem;
    border: 2px solid transparent;
    border-radius: 10px;
}

.cylinder-card--in_use {
    border-color: var(--color-in_use);
    background: rgba(21, 101, 192, 0.06);
}

.cylinder {
    width: 48px;
    display: flex;
    justify-content: center;
}
.cylinder svg {
    width: 46px;
    height: 172px;
    transition: color 0.2s ease;
}
.cylinder svg .cyl-fill {
    fill: currentColor;
}

.cylinder--full { color: var(--color-full); }
.cylinder--in_use { color: var(--color-in_use); }
.cylinder--empty { color: var(--color-empty); }

.cylinder-slot {
    font-size: 0.75rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.badge {
    font-size: 0.68rem;
    color: #7a5b00;
    background: #fff3cd;
    border: 1px solid #ffe082;
    border-radius: 4px;
    padding: 0.1rem 0.35rem;
    text-align: center;
}

.status-form select {
    padding: 0.25rem 0.4rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    font-size: 0.85rem;
}

.order-form {
    margin-top: 2rem;
}
.order-form button {
    padding: 0.7rem 1.4rem;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: #1565c0;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
.order-form button:hover { background: #0d47a1; }

.log-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}
.log-table th, .log-table td {
    text-align: left;
    padding: 0.6rem 0.9rem;
    border-bottom: 1px solid var(--border);
}
.log-table th {
    background: #eceff1;
    font-size: 0.85rem;
    color: var(--muted);
}
.log-table__time {
    white-space: nowrap;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.empty-state { color: var(--muted); }