:root {
    color-scheme: dark;
    --bg: #020617;
    --bg-alt: #020818;
    --accent: #22c55e;
    --accent-soft: rgba(34, 197, 94, 0.2);
    --border: #1f2937;
    --border-strong: #111827;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --danger: #f97373;
    --rack-empty: #020617;
    --rack-device: #0f172a;
    --rack-device-continued: #020617;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top left, #0b1220 0, #020617 55%);
    color: var(--text);
    flex-direction: column;
}

.app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

.app-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.app-header h1 {
    margin: 0;
    font-size: 1.8rem;
    letter-spacing: 0.04em;
}

.subtitle {
    margin-top: 0.25rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.layout {
    display: grid;
    grid-template-columns: minmax(260px, 360px) minmax(260px, 1fr);
    gap: 1.5rem;
    align-items: start;
}

/* Rack area */

.rack-wrapper {
    display: flex;
    justify-content: center;
}

.rack-frame {
    background: var(--bg-alt);
    border-radius: 1rem;
    padding: 1rem 1rem 1.25rem;
    border: 1px solid var(--border-strong);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
    width: 100%;
}

.rack-top-label,
.rack-bottom-label {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.rack-bottom-label {
    margin-top: 0.25rem;
}

/* Rack grid */

.rack {
    border-radius: 0.6rem;
    border: 2px solid var(--border-strong);
    background: linear-gradient(180deg, #020617, #020617);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.rack-unit {
    position: relative;
    display: flex;
    align-items: center;
    padding: 0.1rem 0.35rem;
    min-height: 24px;
    border-bottom: 1px solid #020617;
    border-top: 1px solid #020617;
    background: radial-gradient(circle at left, rgba(15, 23, 42, 0.8), #020617);
    cursor: pointer;
    text-align: left;
    gap: 0.35rem;
    transition: background 120ms ease, transform 80ms ease, box-shadow 120ms ease;
}

.rack-unit:last-child {
    border-bottom: none;
}

.rack-unit::before {
    content: "";
    position: absolute;
    inset: 0;
    border-left: 2px solid rgba(15, 23, 42, 0.9);
    border-right: 2px solid rgba(15, 23, 42, 0.9);
    pointer-events: none;
}

.rack-unit.empty {
    background: var(--rack-empty);
    margin: 0;
    border-radius: 0;
}

.rack-unit.occupied {
    background: radial-gradient(circle at left, rgba(34, 197, 94, 0.18), #020617);
}

.rack-unit.occupied.continued {
    border-top-color: rgba(15, 23, 42, 0.9);
}

.rack-unit.occupied.device-start {
    border-top-left-radius: 0.55rem;
    border-top-right-radius: 0.55rem;
    margin-top: 6px;
    border-top: 1px solid rgba(148, 163, 184, 0.4);
}

.rack-unit.occupied.device-end {
    border-bottom-left-radius: 0.55rem;
    border-bottom-right-radius: 0.55rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.4);
    margin-bottom: 6px;
}

.rack-unit:hover.occupied {
    background: radial-gradient(circle at left, rgba(34, 197, 94, 0.35), #020617);
    transform: translateX(1px);
    box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.4);
}

.rack-unit:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: -2px;
}

/* Text in units */

.unit-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    min-width: 2.2rem;
}

.device-label {
    font-size: 0.82rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Details panel */

.details-panel {
    background: rgba(2, 8, 23, 0.95);
    border-radius: 1rem;
    border: 1px solid var(--border-strong);
    padding: 1rem 1.1rem 1.25rem;
    box-shadow: 0 18px 35px rgba(0, 0, 0, 0.5);
}

.details-panel h2 {
    margin: 0 0 0.75rem;
    font-size: 1.25rem;
}

#details-empty {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.details.hidden {
    display: none;
}

.details h3 {
    margin-top: 0;
    margin-bottom: 0.4rem;
    font-size: 1.1rem;
}

.detail-line {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
    margin: 0.2rem 0;
    font-size: 0.9rem;
}

.label {
    font-weight: 500;
    color: var(--text-muted);
    min-width: 90px;
}

/* Status pill */

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.1rem 0.5rem;
    border-radius: 999px;
    font-size: 0.8rem;
    border: 1px solid transparent;
}

.status-online {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.status-offline {
    background: rgba(239, 68, 68, 0.18);
    border-color: var(--danger);
    color: var(--danger);
}

.status-unknown {
    background: rgba(148, 163, 184, 0.15);
    border-color: #6b7280;
    color: #e5e7eb;
}

/* Services list */

.services-list {
    list-style: none;
    padding-left: 0;
    margin: 0.25rem 0 0.6rem;
    font-size: 0.9rem;
}

.services-list li {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 0.15rem;
}

.services-list li::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--accent);
}

/* Future note */

.future-note {
    margin-top: 0.6rem;
    padding: 0.56rem 0.6rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-radius: 0.6rem;
    border: 1px dashed var(--border);
    background: rgba(15, 23, 42, 0.7);
}

.specs-heading {
    margin-top: 0.5rem;
}

.specs-grid {
    margin-left: 0.3rem;
    margin-bottom: 0.4rem;
    border-left: 1px dashed var(--border);
    padding-left: 0.6rem;
}


/* Responsive */

@media (max-width: 768px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .details-panel {
        margin-top: 0.5rem;
    }
}

/* Footer */
.tiny-footer {
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
    font-size: 0.9rem;
}

.tiny-footer a {
    color: #22c55e;
    text-decoration: none;
    font-weight: 600;
}

.tiny-footer a:hover {
    text-decoration: underline;
}