/* Hallmark · online engineering calculator · existing Apple-inspired theme
 * Pre-emit critique: P5 H5 E5 S5 R5 V4 · live parameters and honest finite-board results */
.tools-page { padding-block: var(--space-2xl) var(--space-3xl); }
.tools-heading { margin-bottom: var(--space-xl); }
.tools-heading > p:first-child { color: var(--color-accent); font-size: 13px; font-weight: 550; margin-bottom: var(--space-sm); }
.tools-heading h1 { font-size: clamp(34px,4vw,48px); line-height: 1.2; letter-spacing: -.04em; }
.tools-lead { color: var(--color-muted); font-size: 15px; margin-top: var(--space-md); }
.tools-tabs { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); max-width: 720px; border-bottom: var(--rule-hair) solid var(--color-rule); margin-bottom: var(--space-lg); }
.tools-tabs button { color: var(--color-muted); padding: 12px 18px 16px; font-size: 15px; white-space: nowrap; border-bottom: 2px solid var(--color-transparent); }
.tools-tabs button[aria-selected="true"] { color: var(--color-ink); border-bottom-color: var(--color-ink); font-weight: 600; }
.tools-tabs button:hover { color: var(--color-ink); }
.tools-panel-intro { color: var(--color-muted); font-size: 13px; margin-bottom: var(--space-lg); }
[role="tabpanel"][hidden] { display: none !important; }
.light-calculator { display: grid; grid-template-columns: 292px minmax(0,1fr); gap: var(--space-lg); align-items: start; }
.light-controls,.light-result { background: var(--color-surface); border: var(--rule-hair) solid var(--color-rule); border-radius: 20px; min-width: 0; }
.light-controls { padding: var(--space-lg); }
.light-controls h2 { font-size: 18px; line-height: 1.4; margin-bottom: var(--space-lg); }
.light-controls label,.light-patterns legend { display: block; font-size: 12px; font-weight: 500; }
.light-input-pair { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: var(--space-sm); }
.light-number { margin-top: var(--space-xs); display: flex; align-items: center; min-width: 0; border: var(--rule-hair) solid var(--color-rule); border-radius: 8px; background: var(--color-paper); }
.light-number:focus-within { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.light-number input { width: 100%; min-width: 0; border: 0; border-radius: inherit; padding: 10px 0 10px 12px; font: 500 16px/1.5 var(--font-body); color: var(--color-ink); background: var(--color-transparent); }
.light-number input:focus { outline: none; }
.light-number > span { font-size: 11px; color: var(--color-muted); padding-inline: var(--space-xs) var(--space-sm); }
.light-area-hint,.light-field-hint { color: var(--color-muted); font-size: 10px; line-height: 1.7; }
.light-area-hint { margin-top: var(--space-xs); }
.light-field { margin-top: var(--space-lg); }
.light-percent input { font-size: 24px; padding-block: var(--space-xs); }
.light-range { width: 100%; margin: 14px 0 6px; accent-color: var(--color-link); cursor: pointer; }
.light-patterns { border: 0; padding: 0; margin: var(--space-lg) 0 0; display: grid; grid-template-columns: minmax(0,1fr); gap: var(--space-xs); }
.light-patterns legend { margin-bottom: var(--space-xs); }
.light-patterns label { display: flex; align-items: center; gap: 7px; border: var(--rule-hair) solid var(--color-rule); border-radius: 8px; padding: var(--space-sm) var(--space-xs); cursor: pointer; }
.light-patterns label:has(input:checked) { border-color: var(--color-link); background: var(--color-paper); }
.light-patterns input { accent-color: var(--color-link); margin: 0; }
.light-patterns svg { width: 46px; height: 38px; fill: var(--color-muted); flex: none; margin-inline: 4px; }
.light-patterns label:has(input:checked) svg { fill: var(--color-link); }
.light-patterns span { font-size: 11px; white-space: nowrap; }
.light-patterns small { display: block; color: var(--color-muted); font-size: 9px; font-weight: 400; margin-top: 3px; }
.light-advanced { border-top: var(--rule-hair) solid var(--color-rule); margin-top: var(--space-lg); padding-top: var(--space-md); }
.light-advanced summary { display: flex; align-items: center; justify-content: space-between; font-size: 12px; cursor: pointer; min-height: 32px; }
.light-advanced summary span { font-size: 10px; color: var(--color-muted); }
.light-advanced summary { gap: 10px; list-style: none; min-height: 44px; }
.light-advanced summary::-webkit-details-marker { display: none; }
.light-disclosure-end { display: flex; align-items: center; gap: 9px; margin-left: auto; }
.light-disclosure-icon { display: block; width: 20px; height: 20px; flex: none; fill: none; stroke: var(--color-muted); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; transition: transform .2s ease; }
.light-advanced[open] > summary .light-disclosure-icon { transform: rotate(180deg); }
.light-advanced summary:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 4px; border-radius: 4px; }
.light-advanced .light-field { margin-top: var(--space-sm); }
.light-advanced .light-field-hint { margin-top: var(--space-xs); }
.light-reset { font-size: 10px; color: var(--color-link); padding: 12px 0 0; min-height: 40px; text-align: left; white-space: nowrap; }
.light-error { color: var(--color-accent); background: var(--color-accent-soft); font-size: 11px; padding: var(--space-sm); margin-top: var(--space-md); border-radius: 6px; }
.light-result { padding: var(--space-lg); }
.light-result-top { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-lg); }
.light-result-top > div > p:first-child { font-size: 12px; color: var(--color-muted); }
.light-pitch { display: flex; align-items: baseline; gap: var(--space-xs); line-height: 1.2; margin-top: var(--space-xs); font-variant-numeric: tabular-nums; }
.light-pitch output { font-size: clamp(40px,4.5vw,58px); font-weight: 600; letter-spacing: -.045em; }
.light-pitch output { min-width: 0; overflow-wrap: anywhere; }
.light-pitch > span { font-size: 15px; color: var(--color-muted); }
.light-pitch-hint { color: var(--color-muted); font-size: 10px; margin-top: var(--space-xs); }
.light-copy { min-height: 36px; padding: var(--space-xs) var(--space-sm); border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-pill); color: var(--color-link); font-size: 11px; white-space: nowrap; }
.light-copy:hover,.light-view-switch button:hover { background: var(--color-soft); }
.light-copy:active,.light-reset:active { opacity: .65; }
.light-spacing { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: var(--space-md); margin: var(--space-lg) 0; padding-bottom: var(--space-lg); border-bottom: var(--rule-hair) solid var(--color-rule); }
.light-spacing div,.light-board-results div { min-width: 0; }
.light-spacing dt,.light-board-results dt { font-size: 10px; color: var(--color-muted); }
.light-spacing dd { margin: var(--space-2xs) 0 0; font-size: 18px; font-weight: 550; font-variant-numeric: tabular-nums; }
.light-spacing dd > span { font-size: 10px; font-weight: 400; color: var(--color-muted); }
.light-preview-toolbar { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); }
.light-preview-toolbar h2 { font-size: 13px; letter-spacing: 0; line-height: 1.5; }
.light-view-switch { display: flex; border: var(--rule-hair) solid var(--color-rule); border-radius: var(--radius-pill); padding: 3px; }
.light-view-switch button { min-height: 30px; padding: 6px 12px; font-size: 10px; white-space: nowrap; border-radius: var(--radius-pill); }
.light-view-switch button[aria-pressed="true"] { background: var(--color-ink); color: var(--color-on-dark); }
.light-preview { margin-top: var(--space-sm); }
.light-preview canvas { display: block; width: 100%; height: 390px; border-radius: 8px; background: var(--color-paper); }
.light-preview figcaption { color: var(--color-muted); font-size: 10px; text-align: center; margin-top: var(--space-xs); min-height: 17px; }
.light-board-results { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: var(--space-md); margin: var(--space-lg) 0 0; padding-top: var(--space-lg); border-top: var(--rule-hair) solid var(--color-rule); }
.light-board-results dd { margin: var(--space-2xs) 0 0; font-size: 21px; line-height: 1.4; font-weight: 550; font-variant-numeric: tabular-nums; }
.light-board-results dd > span { font-size: 10px; font-weight: 400; color: var(--color-muted); margin-left: 4px; }
.light-spacing dd,.light-board-results dd { overflow-wrap: anywhere; }
.light-difference { color: var(--color-muted); font-size: 10px; line-height: 1.8; margin-top: var(--space-md); }
.light-difference[data-large="true"] { color: var(--color-accent); }
.light-copy-status { color: var(--color-link); font-size: 10px; min-height: 0; }
.light-copy-status:not(:empty) { margin-top: var(--space-xs); }
.light-delivery { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: var(--space-lg); padding-top: var(--space-lg); border-top: var(--rule-hair) solid var(--color-rule); }
.light-delivery > div { min-width: 0; }
.light-delivery h2 { font-size: 16px; line-height: 1.5; }
.light-delivery p { font-size: 11px; line-height: 1.9; color: var(--color-muted); margin-top: 6px; }
.light-art-button { display: inline-flex; align-items: center; justify-content: center; flex: none; gap: 12px; min-height: 48px; max-width: 100%; padding: 12px 20px; border-radius: var(--radius-pill); background: var(--color-link); color: var(--color-on-dark); font: 550 13px/1.5 var(--font-body); }
.light-art-button svg { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.light-art-button:hover:not(:disabled) { filter: brightness(1.12); }
.light-art-button:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 4px; }
.light-art-button:disabled { opacity: .4; cursor: not-allowed; }
@media (max-width: 1050px) { .light-delivery { align-items: flex-start; flex-direction: column; gap: 14px; } }
@media (max-width: 760px) { .light-art-button { width: 100%; } }
@media (prefers-reduced-motion: reduce) { .light-disclosure-icon { transition: none; } }
.light-method { margin-top: var(--space-lg); border-top: var(--rule-hair) solid var(--color-rule); }
.light-method summary { padding-block: var(--space-lg); font-size: 13px; cursor: pointer; }
.light-method > div { max-width: 80ch; padding-bottom: var(--space-lg); }
.light-method p { font-size: 12px; color: var(--color-muted); line-height: 1.9; margin-bottom: var(--space-sm); }
.light-method a { color: var(--color-link); }
.process-controls { border: 0; padding: 0 0 18px; margin: 0 0 18px; border-bottom: var(--rule-hair) solid var(--color-rule); min-width: 0; }
.process-controls legend { font-size: 12px; font-weight: 600; margin-bottom: 10px; }
.process-controls label { display: block; margin-top: 10px; font-size: 12px; }
.process-controls select { display: block; margin-top: 6px; padding: 10px 8px; width: 100%; min-width: 0; border: var(--rule-hair) solid var(--color-rule); border-radius: 8px; background: var(--color-paper); color: var(--color-ink); font: 12px var(--font-body); }
.process-help,.process-limit { font-size: 11px; color: var(--color-muted); line-height: 1.8; margin-top: 8px; }
.process-limit { color: var(--color-link); }
.process-check { border-left: 3px solid var(--color-link); background: var(--color-paper); padding: 12px 14px; margin-top: 18px; border-radius: 0 8px 8px 0; }
.process-check strong { font-size: 12px; color: var(--color-link); }
.process-check p { font-size: 11px; line-height: 1.9; color: var(--color-muted); margin-top: 5px; overflow-wrap: anywhere; }
.process-check[data-valid="false"] { border-color: var(--color-accent); }
.process-check[data-valid="false"] strong { color: var(--color-accent); }
.process-fix { color: var(--color-link); border: var(--rule-hair) solid var(--color-link); border-radius: 7px; margin-top: 10px; min-height: 36px; padding: 8px; font-size: 11px; }
.process-fix[hidden],.process-references[hidden] { display: none; }
.light-copy:disabled { opacity: .4; cursor: not-allowed; }
.process-references { margin-top: var(--space-lg); padding-block: var(--space-md); border-top: var(--rule-hair) solid var(--color-rule); }
.process-references summary { font-size: 13px; cursor: pointer; padding-block: 8px; }
.process-references > div { max-width: 88ch; font-size: 12px; line-height: 1.9; color: var(--color-muted); }
.process-references p,.process-references ul { margin-top: 12px; }
.process-references ul { padding-left: 20px; }
.process-references a { color: var(--color-link); overflow-wrap: anywhere; }
@media (max-width: 1050px) {
  .light-calculator { grid-template-columns: 260px minmax(0,1fr); gap: var(--space-md); }
  .light-controls,.light-result { padding: var(--space-md); }
  .light-board-results { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .light-spacing { gap: var(--space-xs); }
  .light-spacing { grid-template-columns: repeat(2,minmax(0,1fr)); gap: var(--space-md); }
  .light-spacing dd { font-size: 16px; }
}
@media (max-width: 760px) {
  .tools-tabs button { font-size: 12px; padding-inline: 4px; }
  .tools-heading h1 { font-size: clamp(28px,8vw,36px); }
  .light-calculator { grid-template-columns: minmax(0,1fr); }
  .tools-page { padding-top: var(--space-xl); }
  .tools-heading { margin-bottom: var(--space-lg); }
  .tools-lead { font-size: 13px; }
  .light-controls { padding: var(--space-lg); }
  .light-preview canvas { height: 340px; }
}
@media (max-width: 360px) {
  .light-controls,.light-result { padding: var(--space-md); }
  .light-preview-toolbar { align-items: flex-start; flex-direction: column; }
  .light-spacing dd { font-size: 14px; }
  .light-board-results dd { font-size: 20px; }
  .light-preview canvas { height: 300px; }
}