:root {
    /* --------------------------------------------------------------
       Core UI colors
       -------------------------------------------------------------- */
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #667085;
    --border: #d9e0ea;
    --btn: #2563eb;
    --btnText: #ffffff;

    /* Tier colors used by bars, threshold regions, and labels */
    --sdr: #3b82f6;
    --hdr: #d97706;
    --uhdr: #dc2626;

    /* --------------------------------------------------------------
       Chart sizing
       -------------------------------------------------------------- */

    /* Desktop reserved gutters */
    --chart-left-gutter: 96px;
    --chart-right-gutter: 72px;
    --chart-column-gap: 10px;

    /* Shared plotting height used by:
       - guide lines
       - threshold regions
       - bar tracks
    */
    --chart-plot-height: 260px;

    /* Extra vertical allowance beneath the plotting frame for the
       metadata that now lives inside the same scrolling column track
       as each bar.
    */
    --chart-meta-space: 128px;

    /* Compact bar cluster sizing */
    --chart-bar-column: 72px;
    --chart-bar-gap: 8px;
    --chart-track-width: 36px;

    /* Mobile overlay label lane sizing */
    --chart-left-overlay: 96px;
    --chart-right-overlay: 72px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
    background: var(--bg);
    color: var(--text);
}

.container {
    max-width: min(1400px, 95vw);
    padding: 16px 12px 24px;
    margin: 0 auto;
}

/* ------------------------------------------------------------------
   Page header
   ------------------------------------------------------------------ */
.site-header {
    padding: 14px 12px 0;
    max-width: min(1400px, 95vw);
    margin: 0 auto;
}

.site-logo {
    height: 32px;
    width: auto;
}

.site-footer {
    max-width: min(1400px, 95vw);
    margin: 24px auto 16px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--muted);
}

.header h1 {
    margin: 0 0 4px;
    font-size: 22px;
    line-height: 1.2;
}

.sub {
    margin: 0;
    color: var(--muted);
    line-height: 1.4;
    font-size: 14px;
}

/* ------------------------------------------------------------------
   Shared card shell
   ------------------------------------------------------------------ */

.card {
    margin-top: 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
}

.card h2 {
    margin: 0 0 10px;
    font-size: 16px;
    line-height: 1.3;
}

.card-section + .card-section {
    margin-top: 14px;
}

.card-section h3 {
    margin: 0 0 10px;
    font-size: 14px;
    color: var(--muted);
    font-weight: 600;
}

.card-actions,
.press-card-header,
.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 10px;
}

.press-card-header {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.press-card-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
}

.press-card-label-title {
    font-size: 13px;
    color: var(--muted);
}

.press-card-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.press-card-name-field span {
    display: none;
}

/* ------------------------------------------------------------------
   Press configuration layout
   ------------------------------------------------------------------ */

.press-grid {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(300px, 360px);
    gap: 12px;
    overflow-x: auto;
    align-items: start;
    margin-top: 10px;
    padding-bottom: 4px;
}

.press-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
}

.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.field span {
    display: block;
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 6px;
}

.row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    align-items: stretch;
}

.slash {
    color: var(--muted);
    padding: 0;
    text-align: center;
    line-height: 1;
}

input,
select {
    width: 100%;
    padding: 9px 10px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #ffffff;
    color: var(--text);
    outline: none;
    font: inherit;
}

input::placeholder {
    color: #98a2b3;
}

select {
    min-width: 0;
}

input:focus,
select:focus {
    border-color: #2b7fff;
}

/* ------------------------------------------------------------------
   Buttons

   .btn provides the shared base.
   Modifier classes use the more specific .btn.<modifier> form so they
   always override the base rule without relying on stylesheet order.
   ------------------------------------------------------------------ */

.btn {
    appearance: none;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 9px 12px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.btn.btn-primary {
    background: var(--btn);
    color: var(--btnText);
    border-color: var(--btn);
}

.btn.btn-secondary {
    background: #ffffff;
    color: var(--text);
    border-color: var(--border);
}

/* Compact modifier used for per-card actions such as Copy / Remove */
.btn.btn-compact {
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 13px;
    line-height: 1.2;
}

/* Emphasised compact action for Copy */
.btn.btn-copy {
    border-color: rgba(37, 99, 235, 0.25);
    color: var(--btn);
    background: rgba(37, 99, 235, 0.06);
}

.btn.btn-primary:hover {
    filter: brightness(1.06);
}

.btn.btn-secondary:hover,
.btn.btn-copy:hover {
    background: #f8fafc;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* ------------------------------------------------------------------
   Result cards + breakdown
   ------------------------------------------------------------------ */

.results {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 10px;
}

.result {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    background: #ffffff;
}

.result .label {
    color: var(--muted);
    font-size: 12px;
    margin-bottom: 6px;
}

.result .value {
    font-size: 18px;
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
    overflow-wrap: anywhere;
}

.hint {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.4;
}

.details {
    margin-top: 12px;
}

.math {
    margin: 10px 0 0;
    padding: 12px;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: auto;
    color: var(--text);
    font-size: 12px;
    line-height: 1.4;
}

/* ------------------------------------------------------------------
   Chart layout: desktop first

   Desktop uses:
   - left gutter for threshold labels
   - centre plot containing guides + scrolling columns
   - right gutter for axis labels

   The centre plot is deliberately taller than the true plotting frame.
   Its total height includes:
   - the real shared plotting frame
   - reserved metadata space below
   ------------------------------------------------------------------ */

.chart-frame {
    display: grid;
    grid-template-columns: var(--chart-left-gutter) minmax(0, 1fr) var(--chart-right-gutter);
    column-gap: var(--chart-column-gap);
    align-items: start;
}

.chart-region-gutter,
.chart-axis-gutter {
    position: relative;
    height: var(--chart-plot-height);
}

.chart-region-gutter {
    grid-column: 1;
}

.chart-axis-gutter {
    grid-column: 3;
}

/*
  chart-plot is the full body of the centre chart column.

  Its total height is:
  plotting frame + metadata allowance
*/
.chart-plot {
    grid-column: 2;
    position: relative;
    height: calc(var(--chart-plot-height) + var(--chart-meta-space));
    isolation: isolate;
    overflow: visible;
}

/*
  Guides and threshold regions are restricted to the true plotting frame only.
  They must not extend into the metadata allowance below.
*/
.chart-guides {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--chart-plot-height);
    pointer-events: none;
    z-index: 0;
}

/*
  On desktop, guides and threshold regions visually extend underneath the
  left and right gutters so the chart still reads as one continuous figure.
*/
.chart-guide,
.chart-threshold-region {
    left: calc(-1 * (var(--chart-left-gutter) + var(--chart-column-gap)));
    right: calc(-1 * (var(--chart-right-gutter) + var(--chart-column-gap)));
}

.chart-guide {
    position: absolute;
    border-top: 1px solid rgba(120, 140, 180, 0.28);
}

/* Threshold regions: stacked background bands */
.chart-threshold-region {
    position: absolute;
    pointer-events: none;
    z-index: 0;
}

.chart-threshold-region.has-boundary {
    border-top: 1px dashed currentColor;
}

.chart-threshold-region.sdr {
    background: rgba(59, 130, 246, 0.08);
    color: rgb(59, 130, 246);
}

.chart-threshold-region.hdr {
    background: rgba(217, 119, 6, 0.08);
    color: rgb(217, 119, 6);
}

.chart-threshold-region.uhdr {
    background: rgba(220, 38, 38, 0.08);
    color: rgb(220, 38, 38);
}

/* ------------------------------------------------------------------
   Desktop label gutters
   ------------------------------------------------------------------ */

.chart-threshold-label-layer--gutter {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 3;
}

.chart-threshold-label {
    position: absolute;
    left: 0.5rem;
    max-width: calc(var(--chart-left-gutter) - 0.75rem);
    padding: 0 0.35rem;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(15, 23, 42, 0.10);
    border-radius: 999px;
    font-size: 11px;
    line-height: 1.2;
    font-weight: 600;
    white-space: nowrap;
}

.chart-threshold-label.sdr {
    color: rgb(59, 130, 246);
}

.chart-threshold-label.hdr {
    color: rgb(217, 119, 6);
}

.chart-threshold-label.uhdr {
    color: rgb(220, 38, 38);
}

.chart-axis-gutter .chart-guide-label {
    position: absolute;
    left: 0;
    max-width: calc(var(--chart-right-gutter) - 0.5rem);
    padding: 0 4px;
    background: rgba(255, 255, 255, 0.92);
    border-radius: 4px;
    font-size: 11px;
    color: var(--muted);
    white-space: nowrap;
}

/* Hidden on desktop, enabled in the mobile switch below */
.chart-threshold-label-layer--overlay,
.chart-axis-label-layer--overlay {
    display: none;
}

/* ------------------------------------------------------------------
   Single scrolling column track

   One shared horizontal scroller keeps:
   - bar plots
   - values
   - press labels
   - tier labels

   perfectly aligned.

   Each chart-column contains:
   - chart-column-plot : fixed shared plotting height
   - bar-meta          : metadata below
   ------------------------------------------------------------------ */

.chart-columns {
    position: relative;
    z-index: 1;

    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: var(--chart-bar-column);
    gap: var(--chart-bar-gap);

    justify-content: start;
    overflow-x: auto;

    padding: 0 4px 0;
}

.chart-column {
    display: grid;
    grid-template-rows: var(--chart-plot-height) auto;
    justify-items: center;
}

.chart-column-plot {
    width: 100%;
    height: var(--chart-plot-height);
    display: flex;
    align-items: end;
    justify-content: center;
}

/* ------------------------------------------------------------------
   Bars
   ------------------------------------------------------------------ */

.bar-track {
    height: 100%;
    width: var(--chart-track-width);
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #f8fafc;
    display: flex;
    align-items: end;
    justify-content: center;
    padding: 0;
    position: relative;
}

.bar-fill {
    width: calc(100% - 10px);
    border-radius: 6px;
    min-height: 2px;
    background: var(--btn);
}

.bar-fill.sdr {
    background: var(--sdr);
}

.bar-fill.hdr {
    background: var(--hdr);
}

.bar-fill.uhdr {
    background: var(--uhdr);
}

/* ------------------------------------------------------------------
   Bar metadata

   Metadata lives inside the same scrolling column as the bar above.
   This guarantees that bars and labels stay in sync horizontally.
   ------------------------------------------------------------------ */

.bar-meta {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 12px;
}

.bar-value {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
    text-align: center;
    line-height: 1.2;
}

.bar-unit {
    font-size: 0.8em;
    margin-left: 0.25rem;
    color: #666;
}

.bar-label {
    margin-top: 0;
    font-size: 12px;
    text-align: center;
    overflow-wrap: anywhere;
}

.bar-tier {
    margin-top: 4px;
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ------------------------------------------------------------------
   Product context
   ------------------------------------------------------------------ */

.product-context {
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #f8fafc;
    font-size: 14px;
    line-height: 1.5;
}

.product-context p {
    margin: 0 0 6px;
}

.product-context a {
    font-weight: 600;
    text-decoration: none;
}

.product-context a:hover {
    text-decoration: underline;
}

/* ------------------------------------------------------------------
   Responsive form controls
   ------------------------------------------------------------------ */

@media (min-width: 480px) {
    .row {
        grid-template-columns: 1fr auto;
        align-items: center;
    }

    .row.speed-row {
        grid-template-columns: 1fr auto auto auto;
    }

    .slash {
        padding: 0 2px;
    }
}

/* ------------------------------------------------------------------
   Narrow-screen chart switch

   On narrow screens:
   - left and right gutters disappear
   - threshold labels and tick labels become translucent overlays
   - the plot reclaims the full chart width
   - the single scrolling column track remains unchanged
   ------------------------------------------------------------------ */

@media (max-width: 768px) {
    .chart-frame {
        display: block;
    }

    .chart-region-gutter,
    .chart-axis-gutter {
        display: none;
    }

    /*
      On mobile, guides and threshold regions no longer need to stretch under
      reserved gutters because those gutters are hidden.
    */
    .chart-guide,
    .chart-threshold-region {
        left: 0;
        right: 0;
    }

    .chart-threshold-label-layer--overlay,
    .chart-axis-label-layer--overlay {
        display: block;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: var(--chart-plot-height);
        pointer-events: none;
        z-index: 3;
    }

    .chart-threshold-label {
        max-width: calc(var(--chart-left-overlay) - 0.75rem);
        background: rgba(255, 255, 255, 0.72);
        border-color: rgba(15, 23, 42, 0.08);
        backdrop-filter: blur(2px);
    }

    .chart-axis-label-layer--overlay .chart-guide-label {
        position: absolute;
        right: 0.5rem;
        max-width: calc(var(--chart-right-overlay) - 0.75rem);
        padding: 0 0.3rem;
        background: rgba(255, 255, 255, 0.68);
        border-radius: 4px;
        font-size: 11px;
        color: var(--muted);
        white-space: nowrap;
        backdrop-filter: blur(2px);
    }
}

/* ------------------------------------------------------------------
   Validation summary block
   ------------------------------------------------------------------ */

.validation-summary {
    margin-top: 0.5rem;
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    border: 1px solid #e3b341;
    background: #fff8e1;
    font-size: 0.9rem;
    line-height: 1.4;
}

.validation-summary strong {
    display: block;
    margin-bottom: 0.25rem;
    color: #7a5a00;
}

.validation-list {
    margin: 0;
    padding-left: 1.2rem;
}

.validation-list li {
    margin: 0.15rem 0;
    color: #5c4300;
}

/* ------------------------------------------------------------------
   Optional invalid-state emphasis
   ------------------------------------------------------------------ */

.press-card:has(.validation-summary) {
    border-color: #e3b341;
}

.press-card:has(.validation.summary) .results {
    opacity: 0.85;
}