:root {
    --bg: #0e1116;
    --panel: #161b22;
    --panel-2: #1f2630;
    --border: #2a313c;
    --text: #e6edf3;
    --text-dim: #9aa6b2;
    --accent: #4f9eff;
    --accent-strong: #2c7be0;
    --accent-soft: rgba(79, 158, 255, 0.12);
    --female: #f59e0b;
    --male: #0ea5e9;
    --neglect: #444;
    --success: #2ecc71;
    --danger: #e84a4a;
    --warn: #ffb454;
    --shadow: 0 6px 28px rgba(0, 0, 0, 0.35);
    --radius: 12px;
    --radius-sm: 8px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
    margin: 0; padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    line-height: 1.45;
    min-height: 100vh;
}

a { color: var(--accent); }

/* ── Topbar / tabs ─────────────────────────────────────────────────────── */

.topbar {
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    padding: 14px 22px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.brand h1 {
    margin: 0;
    font-size: 22px;
    letter-spacing: -0.01em;
}
.brand-sub {
    color: var(--text-dim);
    font-size: 14px;
    margin-left: 10px;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}
.tab {
    padding: 8px 14px;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 120ms ease;
}
.tab:hover { color: var(--text); background: var(--panel-2); }
.tab.is-active {
    color: var(--text);
    background: var(--accent-soft);
    border-color: rgba(79, 158, 255, 0.4);
}

/* ── Layout ────────────────────────────────────────────────────────────── */

.main {
    padding: 22px;
    max-width: 1500px;
    margin: 0 auto;
}

.panel-row {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 18px;
    align-items: start;
}

@media (max-width: 1000px) {
    .panel-row { grid-template-columns: 1fr; }
    .controls  { position: static; max-height: none; top: auto; }
}

.controls {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 130px;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
}

.controls h2 {
    margin: 0 0 14px;
    font-size: 16px;
    color: var(--text);
}

.controls .muted { color: var(--text-dim); font-size: 12.5px; line-height: 1.5; }
.muted.small { font-size: 12px; }

.control-group {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px 14px;
    margin: 12px 0;
}
.control-group legend {
    color: var(--text-dim);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0 4px;
}

.control {
    margin: 10px 0;
    font-size: 13px;
}
.control label {
    display: block;
    color: var(--text-dim);
    font-weight: 500;
    margin-bottom: 4px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}
.control output {
    color: var(--text);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.control input[type="range"],
.control input[type="text"],
.control select {
    width: 100%;
    box-sizing: border-box;
}
.control input[type="text"],
.control select {
    padding: 7px 10px;
    background: var(--panel-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font: inherit;
    margin-top: 4px;
}
.control input[type="range"] {
    accent-color: var(--accent);
    margin-top: 4px;
}

/* ── Buttons ───────────────────────────────────────────────────────────── */

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.btn {
    padding: 8px 14px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text);
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 120ms ease;
}
.btn:hover { background: #2a313c; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
    background: var(--accent-strong);
    border-color: var(--accent-strong);
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }

/* ── Display panes ─────────────────────────────────────────────────────── */

.display {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    min-height: 400px;
}

.scene-wrap {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.scene-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
}

.plot-area {
    width: 100%;
    height: 600px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

/* ── Replay tab specifics ──────────────────────────────────────────────── */

.readout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin: 14px 0;
}
.readout {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
}
.readout-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
}
.readout-val {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    margin-top: 2px;
}

.ribbon-wrap {
    margin-top: 10px;
}
.ribbon-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    margin-bottom: 6px;
}
.ribbon-legend {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 8px;
}
.legend-chip {
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    letter-spacing: 0.02em;
}