/* ═══════════════════════════════════════════════
   plasma — Phase 5 layout overrides
   Most styling inherits from /shared/base.css
   (.glass, .sim-toolbar, .sim-panel, .tool-btn,
   .ctrl-row, .stats-header, .sidebar-tabs, etc.).
   This file adds plasma-specific positioning,
   the canvas full-viewport rule, the probe
   overlay, and a small handful of layout tokens.
   ═══════════════════════════════════════════════ */

:root {
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    --sp-8: 32px;
    --inset: 12px;
}

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-variation-settings: var(--fvs-prose);
}

/* ─── Canvas (full viewport) ──────────────────── */

#simCanvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 0;
}

/* ─── Topbar overrides ────────────────────────── */

#topbar {
    top: var(--inset);
    left: var(--inset);
    right: var(--inset);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--sp-6);
    min-width: 0;
}

/* ─── Control panel overrides ─────────────────── */

#control-panel {
    top: calc(var(--inset) + var(--toolbar-h) + var(--inset));
    right: var(--inset);
    bottom: var(--inset);
    max-width: calc(100vw - var(--inset) * 2);
    pointer-events: none;
}

#control-panel.open {
    pointer-events: auto;
}

/* ─── Sidebar panel sections ──────────────────── */

.panel-section {
    padding: var(--sp-3) 0 var(--sp-4);
}

.panel-section + .panel-section {
    border-top: none;       /* lines-as-accents, not boundaries */
    margin-top: 0;
}

.panel-hint {
    font-family: var(--font-sans);
    font-variation-settings: var(--fvs-prose);
    font-style: italic;
    font-size: var(--font-sm);
    color: var(--text-muted);
    margin: var(--sp-2) 0 0;
    line-height: 1.4;
}

.group-label-sub {
    font-size: var(--font-sm);
    margin-top: var(--sp-3);
    margin-bottom: var(--sp-2);
}

/* ─── Control rows for plasma BC dropdowns ────── */

.ctrl-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-3);
    padding: var(--sp-2) 0;
}

.ctrl-row label {
    flex: 0 0 auto;
    font-size: var(--font-base);
    color: var(--text-secondary);
}

.ctrl-row .sim-select,
.ctrl-row .sim-dropdown {
    flex: 1 1 auto;
    min-width: 0;
}

.ctrl-row input[type="number"] {
    flex: 1 1 auto;
    min-width: 0;
    background: var(--bg-panel-solid);
    color: var(--text);
    font-family: var(--font-mono);
    font-variation-settings: var(--fvs-mono);
    font-size: var(--font-base);
    padding: var(--sp-1) var(--sp-2);
    border: none;
    border-radius: var(--radius);
    outline: none;
    text-align: right;
}

.ctrl-row input[type="number"]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 0;
}

/* ─── Sparkline + canvases inside stat-rows ───── */

.spark-wrap {
    display: inline-flex;
    align-items: center;
}

.spark-canvas {
    display: block;
}

/* ─── Driven inflow reveal (controlled by bindDeps) ── */

.driven-panel {
    padding-top: var(--sp-2);
}

/* ─── No-WebGPU landing ───────────────────────── */

#no-webgpu {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-6);
    text-align: center;
    background: var(--bg);
    color: var(--text);
    z-index: 1000;
    gap: var(--sp-4);
}

#no-webgpu[hidden] { display: none; }

#no-webgpu h1 {
    font-family: var(--font-display);
    font-variation-settings: var(--fvs-prose);
    font-weight: 600;
    font-size: 1.5rem;
    margin: 0;
}

#no-webgpu p {
    max-width: 36rem;
    margin: 0;
    line-height: 1.5;
    color: var(--text-muted, var(--text));
}

#no-webgpu a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ─── Mobile responsive ───────────────────────── */

@media (max-width: 900px) {
    :root {
        --inset: 8px;
        --panel-w: 100%;
    }
    #control-panel {
        max-width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .tab-panels,
    #topbar {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background: var(--bg-panel-solid);
    }
}