/* Theme tokens shared by controls, metrics, and Canvas-adjacent UI. */
:root {
    color-scheme: dark;
    --bg: #071018;
    --surface: #0c1722;
    --surface-2: #101e2b;
    --surface-3: #142535;
    --border: rgba(151, 180, 204, 0.15);
    --text: #eef7fc;
    --muted: #91a7b8;
    --faint: #607789;
    --cyan: #54d6dd;
    --green: #54d996;
    --blue: #65a8ff;
    --red: #ff7796;
    --amber: #f8bc62;
    --violet: #b69cff;
    --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--bg); }

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, system-ui, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 12% -10%, rgba(41, 132, 163, 0.20), transparent 30rem),
        radial-gradient(circle at 90% 5%, rgba(91, 68, 156, 0.16), transparent 28rem),
        var(--bg);
}

button, input, select { font: inherit; }

button, select, input[type="range"], input[type="checkbox"] { cursor: pointer; }

button:focus-visible, select:focus-visible, input:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
}

/* Application shell and material-preset header. */
.app-shell { width: min(1720px, 100%); margin: 0 auto; padding: 18px; }

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 16px;
    padding: 14px 18px;
    background: rgba(12, 23, 34, 0.82);
    border: 1px solid var(--border);
    border-radius: 14px;
    backdrop-filter: blur(16px);
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }

.brand-mark {
    display: grid;
    place-items: center;
    flex: 0 0 38px;
    height: 38px;
    border-radius: 10px;
    color: #071018;
    font: 700 22px Georgia, serif;
    background: linear-gradient(135deg, var(--cyan), var(--green));
    box-shadow: 0 0 28px rgba(84, 214, 221, 0.18);
}

.brand h1 { margin: 0; font-size: clamp(1rem, 2vw, 1.25rem); letter-spacing: -0.025em; }
.brand p { margin: 3px 0 0; color: var(--muted); font-size: 0.75rem; }

.presets { display: flex; gap: 7px; }
.preset, .text-button {
    border: 1px solid var(--border);
    color: var(--muted);
    background: transparent;
    border-radius: 8px;
    padding: 7px 11px;
    transition: 150ms ease;
}
.preset:hover, .text-button:hover { color: var(--text); border-color: rgba(84, 214, 221, 0.45); }
.preset.active { color: var(--cyan); background: rgba(84, 214, 221, 0.1); border-color: rgba(84, 214, 221, 0.36); }

/* Main workspace: numerical/plot output beside the parameter panel. */
main { display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 16px; align-items: start; }
.workspace { min-width: 0; display: grid; gap: 12px; }

/* Compact solved-value cards remain stable in height during temperature sweeps. */
.summary-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px; }
.metric {
    min-width: 0;
    min-height: 83px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: linear-gradient(145deg, rgba(16, 30, 43, 0.95), rgba(10, 22, 32, 0.95));
    border: 1px solid var(--border);
    border-radius: 11px;
}
.metric span { color: var(--muted); font-size: 0.7rem; white-space: nowrap; }
.metric strong { overflow: hidden; text-overflow: ellipsis; font: 500 0.84rem var(--mono); color: var(--text); }
.metric small { color: var(--faint); font-size: 0.63rem; }
.metric.featured { border-color: rgba(84, 214, 221, 0.3); }
.metric.featured strong { color: var(--cyan); }
.metric.electron strong { color: var(--blue); }
.metric.hole strong { color: var(--red); }

/* Plot card owns a fixed-height Canvas region plus status and export controls. */
.canvas-card {
    position: relative;
    height: clamp(520px, calc(100vh - 218px), 720px);
    min-height: 520px;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(13, 27, 39, 0.96), rgba(7, 17, 25, 0.98));
    border: 1px solid var(--border);
    border-radius: 14px;
}

.plot-toolbar {
    height: 42px;
    padding: 0 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--muted);
    border-bottom: 1px solid var(--border);
    font-size: 0.72rem;
}
.plot-toolbar > div { display: flex; align-items: center; gap: 7px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
.status-dot.error { background: var(--red); box-shadow: 0 0 10px var(--red); }
.plot-note { color: var(--faint); }
.plot-actions { justify-content: flex-end; }
.toolbar-button {
    padding: 3px 7px;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--muted);
    background: rgba(255,255,255,0.025);
    font-size: 0.62rem;
}
.toolbar-button:hover { color: var(--cyan); border-color: rgba(84,214,221,0.35); }

canvas { display: block; width: 100%; height: calc(100% - 42px); }
.plot-tooltip {
    display: none;
    position: absolute;
    z-index: 5;
    pointer-events: none;
    max-width: 230px;
    padding: 8px 10px;
    border: 1px solid rgba(84, 214, 221, 0.28);
    border-radius: 8px;
    color: var(--text);
    background: rgba(5, 14, 21, 0.94);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
    font: 500 0.68rem/1.55 var(--mono);
    white-space: pre-line;
}

.diagnostics {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px 18px;
    padding: 9px 13px;
    color: var(--faint);
    background: rgba(12, 23, 34, 0.68);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.67rem;
}
.diagnostics strong { margin-left: 5px; color: var(--muted); font-family: var(--mono); font-weight: 500; }

/* Scrollable parameter controls; physics and display policies are grouped separately. */
.controls {
    max-height: calc(100vh - 112px);
    overflow-y: auto;
    padding: 18px;
    background: rgba(12, 23, 34, 0.88);
    border: 1px solid var(--border);
    border-radius: 14px;
    scrollbar-width: thin;
    scrollbar-color: var(--surface-3) transparent;
}
.controls-heading { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 12px; }
.controls-heading h2 { margin: 3px 0 0; font-size: 1.08rem; }
.eyebrow { color: var(--cyan); font-size: 0.62rem; letter-spacing: 0.11em; text-transform: uppercase; }
.text-button { font-size: 0.68rem; }

.control-section { padding: 14px 0; border-top: 1px solid var(--border); }
.control-section:first-of-type { border-top: 0; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field-label, .range-heading label { color: var(--muted); font-size: 0.73rem; }
.model-selects { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0 0; }
.model-selects select { font-size: 0.7rem; }
select {
    width: 100%;
    margin-top: 7px;
    padding: 9px 10px;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-2);
}
.range-field { display: grid; gap: 8px; }
.range-field + .range-field { margin-top: 15px; }
.range-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
output { color: var(--text); font: 500 0.68rem var(--mono); white-space: nowrap; }

input[type="range"] { width: 100%; height: 4px; margin: 4px 0; appearance: none; border-radius: 2px; background: #263848; }
input[type="range"]::-webkit-slider-thumb {
    width: 14px;
    height: 14px;
    appearance: none;
    border: 2px solid #dffcff;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 0 3px rgba(84, 214, 221, 0.1);
}
input[type="range"]:disabled { cursor: not-allowed; opacity: 0.25; }

.check-row { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.71rem; }
.check-row + .range-field, .range-field + .check-row { margin-top: 11px; }
.check-row output { margin-left: auto; }
input[type="checkbox"] { width: 14px; height: 14px; margin: 0; accent-color: var(--cyan); }
.section-title { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 12px; }
.section-title span { font-size: 0.76rem; font-weight: 600; }
.section-title small { color: var(--faint); font-size: 0.62rem; }
.dopant-control { margin: 11px 0 16px; padding-left: 9px; border-left: 2px solid var(--border); }
.dopant-control.donor { border-color: rgba(101, 168, 255, 0.5); }
.dopant-control.acceptor { border-color: rgba(255, 119, 150, 0.5); }
.dopant-control input[type="range"] { margin-top: 12px; }
.ionization-controls { display: none; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 15px; }
.ionization-controls.visible { display: grid; }
.field-help { margin: 9px 0 0; color: var(--faint); font-size: 0.63rem; line-height: 1.5; }
#manual-ef-section { display: none; }
#manual-ef-section.visible { display: block; }
.display-options { display: grid; gap: 11px; }
.display-options .section-title { margin-bottom: 0; }
.occupation-controls { margin-top: 3px; padding-top: 12px; border-top: 1px solid var(--border); }
.occupation-custom { display: none; gap: 8px; margin-top: 10px; padding: 10px; border-radius: 8px; background: rgba(255,255,255,0.018); }
.occupation-custom.visible { display: grid; }
.width-scale-controls { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 8px; }
.width-scale-controls .text-button { min-height: 34px; white-space: nowrap; }
.width-scale-controls .text-button:disabled { cursor: not-allowed; opacity: 0.35; }
#occupation-scale-help.clipped { color: var(--amber); }

.model-note { padding: 12px; border-radius: 9px; background: rgba(84, 214, 221, 0.06); border: 1px solid rgba(84, 214, 221, 0.13); }
.model-note strong { color: var(--cyan); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; }
.model-note p { margin: 6px 0 0; color: var(--muted); font-size: 0.65rem; line-height: 1.55; }

/* Responsive breakpoints preserve plot space before stacking the control panel. */
@media (max-width: 1250px) {
    .summary-grid { grid-template-columns: repeat(3, 1fr); }
    .canvas-card { height: 680px; }
}

@media (max-width: 980px) {
    main { grid-template-columns: 1fr; }
    .controls { max-height: none; }
    .canvas-card { height: 760px; }
}

@media (max-width: 620px) {
    .app-shell { padding: 9px; }
    .topbar { align-items: flex-start; padding: 12px; }
    .brand p { display: none; }
    .summary-grid { grid-template-columns: repeat(2, 1fr); }
    .metric { min-height: 76px; }
    .canvas-card { height: 780px; }
    .plot-note { display: none !important; }
    .diagnostics { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}