/* Control valve sizing tool.
 *
 * shared.css supplies theme variables, resets, header/footer and base input
 * styling, but NOT the layout component classes, so they are defined here.
 *
 * --text-muted is deliberately never used: it measures 2.6:1 on the light card
 * and 3.7:1 on the dark one, failing WCAG AA in both themes. --text-secondary
 * is used throughout instead.
 */

.container { max-width: 1200px; margin: 0 auto; padding: 24px 16px 48px; }

/* Carries the one-line spoken result summary. The results panel itself is not a
 * live region, because it rebuilds on every keystroke and would be re-read
 * whole. */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

header { margin-bottom: 20px; }
.back-link { color: var(--accent-engineering); text-decoration: none; font-size: 0.875rem; }
.back-link:hover { text-decoration: underline; }
header h1 { font-family: 'Space Grotesk', system-ui, sans-serif; font-size: 2rem; margin: 8px 0 4px; }
.subtitle { color: var(--text-secondary); margin: 0; }

/* --- scope disclaimer -----------------------------------------------------
 * The whole component lives in css/shared.css; this tool's copy was its source.
 * Anything that needs to differ goes below and wins on load order.
 */

/* --- layout --------------------------------------------------------------- */
.calculator-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.calculator-panel, .sidebar { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 18px; }
.panel-header { margin: 4px 0 14px; }
.panel-header h2 { font-family: 'Space Grotesk', system-ui, sans-serif; font-size: 1.25rem; margin: 0 0 4px; }
.panel-header p { margin: 0; color: var(--text-secondary); font-size: 0.875rem; }

.control-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 14px; }
.input-group { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.input-group label { font-size: 0.8125rem; color: var(--text-secondary); font-weight: 500; }
.unit { color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; }
.main-input { width: 100%; box-sizing: border-box; }
.field-note { margin: 0; font-size: 0.75rem; color: var(--text-secondary); line-height: 1.4; }

/* --- the answer, and the regime beside it ---------------------------------
 * The regime is never hidden and never absent. A coefficient without its regime
 * is the thing this tool exists to stop shipping, so the badge sits inside the
 * lead block rather than folded away with the detail.
 */
.result-lead { text-align: center; padding: 8px 0 16px; border-bottom: 1px solid var(--border-color); margin-bottom: 14px; }
.result-lead-label { font-size: 0.8125rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; }
/* The one number on the page a user copies. On the light card the theme accent
 * measures 3.19:1 against white, which passes AA only because 40px counts as
 * large text, with 0.19 to spare. Darkening the accent for this element alone in
 * light theme takes it to 5.26:1, clearing AA for normal text so the margin no
 * longer depends on the font size surviving a future layout change. Dark theme
 * already measures 8.25:1 and is left exactly as it was. */
.result-lead-value { font-family: 'JetBrains Mono', monospace; font-size: 2.5rem; font-weight: 700; color: var(--accent-engineering); line-height: 1.1; margin: 6px 0 2px; }
[data-theme="light"] .result-lead-value { color: color-mix(in srgb, var(--accent-engineering) 75%, #000); }
.result-lead-sub { font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 12px; }

.regime-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px; border-radius: 999px;
    font-family: 'JetBrains Mono', monospace; font-size: 0.875rem; font-weight: 600;
    border: 1px solid currentColor;
}
.regime-badge[data-severity="info"] { color: var(--accent-success); background: color-mix(in srgb, var(--accent-success) 12%, transparent); }
.regime-badge[data-severity="warn"] { color: var(--accent-warning); background: color-mix(in srgb, var(--accent-warning) 14%, transparent); }
.regime-badge[data-severity="error"] { color: var(--accent-error); background: color-mix(in srgb, var(--accent-error) 14%, transparent); }
/* The icon differs in SHAPE between severities, not only in tint. */
.regime-icon { font-size: 0.75rem; }

.result-status { font-size: 0.875rem; margin-bottom: 12px; line-height: 1.45; }
.result-status[data-state="error"] { color: var(--accent-error); }

.advisories { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.advisory { display: flex; gap: 8px; align-items: flex-start; font-size: 0.8125rem; line-height: 1.45; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border-color); color: var(--text-secondary); }
.advisory[data-severity="warn"] { border-color: color-mix(in srgb, var(--accent-warning) 45%, transparent); background: color-mix(in srgb, var(--accent-warning) 8%, transparent); }
.advisory[data-severity="error"] { border-color: color-mix(in srgb, var(--accent-error) 45%, transparent); background: color-mix(in srgb, var(--accent-error) 8%, transparent); }
.advisory-icon { flex: 0 0 auto; font-size: 0.6875rem; padding-top: 2px; }

.result-fold { border-top: 1px solid var(--border-color); padding: 2px 0 4px; }
/* Same 44px hit area as the disclaimer. These four measured 22px, which is half
 * the guideline and they are the only way to reach the regime detail. */
.result-fold > summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    min-height: 44px;
    display: flex;
    align-items: center;
}
.result-box { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.result-row { display: flex; justify-content: space-between; gap: 12px; font-size: 0.8125rem; }
.result-label { color: var(--text-secondary); }
.result-value { font-family: 'JetBrains Mono', monospace; text-align: right; word-break: break-word; }

@media (max-width: 900px) {
    .calculator-layout { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 768px) {
    .control-row { grid-template-columns: minmax(0, 1fr); }
    .result-lead-value { font-size: 2rem; }
}

/* --- installed characteristic plot ----------------------------------------
 * Fixed viewBox with preserveAspectRatio, so the figure scales with its
 * container rather than needing a responsive redraw. The two curves are
 * separated by dash pattern as well as colour, for the same reason the regime
 * badge carries an icon shape.
 */
/* min-width matters as much as the type size below. The labels are sized in
 * viewBox units, so they shrink with the figure: at 9 units in a 320-unit box
 * they rendered under 9 CSS px in a narrow sidebar. 11 units in a box that
 * cannot go below 280px keeps them at roughly 11px on the smallest layout. */
.characteristic-chart { width: 100%; min-width: 280px; height: auto; margin-top: 12px; overflow: visible; }
.chart-axis { stroke: var(--border-color); stroke-width: 1; }
.chart-line { fill: none; stroke-width: 2; stroke-linejoin: round; }
.chart-inherent { stroke: var(--text-secondary); stroke-dasharray: 5 4; }
.chart-installed { stroke: var(--accent-engineering); }
.chart-travel { stroke: var(--accent-warning); stroke-width: 1; stroke-dasharray: 2 3; }
.chart-label, .chart-tick, .chart-legend {
    fill: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
}
.chart-label { text-anchor: middle; }
.chart-tick { text-anchor: end; }