/* ROBERIN fraction calculator - The New workspace (20260714a)
 * Scope: .tn-frac-* only. Hero / design-note / meta / ads / article skeleton owned by
 * the shared The New CSS. Gate baked in from the start: container gap (#22/#37),
 * scheme-flipping tokens (#8), aligned rows (#2/#35), distinct dark buttons (#14). */

.tn-frac-page {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  color: #1a1208;
  -webkit-text-fill-color: currentColor;
}

.tn-frac-page,
.tn-frac-page * {
  box-sizing: border-box;
}

.tn-frac-tool {
  --frac-ink: #1a1208;
  --frac-muted: #5a4a30;
  --frac-line: #b8a888;
  --frac-soft: #ddd4be;
  --frac-paper: #faf6ee;
  --frac-wash: #f5efdf;
  --frac-surface: rgba(255, 252, 244, 0.74);
  --frac-card: rgba(255, 252, 244, 0.5);
  --frac-accent: #c44a00;
  --frac-btn-sec-bg: #ede6d4;
  --frac-btn-sec-hover: #dfd4bb;
  --frac-btn-sec-text: #1a1208;
  --frac-btn-pri-bg: #1a1208;
  --frac-btn-pri-hover: #c44a00;
  --frac-btn-pri-text: #faf6ee;
  margin: 0 auto 18px;
  border-top: 2px solid var(--frac-ink);
  border-bottom: 1px solid var(--frac-line);
  background: linear-gradient(180deg, var(--frac-paper), var(--frac-wash));
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
}

.tn-frac-tool ul,
.tn-frac-tool ol,
.tn-frac-tool li,
.tn-frac-tool dd {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tn-frac-tool dl,
.tn-frac-tool dt,
.tn-frac-tool p {
  margin: 0;
  padding: 0;
}

.tn-frac-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
  gap: 0;
  min-height: 380px;
}

.tn-frac-input,
.tn-frac-result {
  display: grid;
  align-content: start;
  gap: 14px;
  min-width: 0;
  padding: 18px;
}

.tn-frac-input {
  border-right: 1px solid var(--frac-line);
}

.tn-frac-pane-label {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  min-height: 26px;
  border-bottom: 1px solid var(--frac-ink);
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 700 12px/1.2 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Fraction rows: [op | field | delete], aligned across rows (op column reserved). */
.tn-frac-rows {
  display: grid;
  gap: 10px;
}

.tn-frac-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 8px;
}

.tn-frac-control {
  display: flex;
  align-items: stretch;
  min-width: 0;
  height: 40px;
  border: 1px solid var(--frac-line);
  background: var(--frac-surface);
}

.tn-frac-op-wrap {
  padding: 0;
}

.tn-frac-op-wrap--empty {
  border: 0;
  background: none;
}

.tn-frac-op {
  width: 100%;
  min-width: 0;
  height: 100%;
  padding: 0 4px;
  border: 0;
  background: transparent;
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
  font: 700 16px/1 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  text-align: center;
  text-align-last: center;
  outline: 0;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.tn-frac-op:focus-visible {
  outline: 2px solid var(--frac-accent);
  outline-offset: -2px;
}

/* Stacked fraction input: numerator / bar / denominator. */
.tn-frac-field {
  display: grid;
  min-width: 0;
  padding: 6px 12px;
  border: 1px solid var(--frac-line);
  background: var(--frac-surface);
}

.tn-frac-field input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
  font: 700 18px/1.25 Georgia, "Times New Roman", serif;
  text-align: center;
  outline: 0;
  appearance: textfield;
  -moz-appearance: textfield;
  font-variant-numeric: tabular-nums lining-nums;
}

.tn-frac-field input::-webkit-outer-spin-button,
.tn-frac-field input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.tn-frac-field input::placeholder {
  color: var(--frac-muted);
  opacity: 0.5;
  font-size: 12px;
}

.tn-frac-field input:focus-visible {
  outline: 2px solid var(--frac-accent);
  outline-offset: 2px;
}

.tn-frac-input-bar {
  height: 1px;
  margin: 4px 0;
  background: var(--frac-ink);
}

.tn-frac-del {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--frac-soft);
  border-radius: 0;
  background: transparent;
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 700 14px/1 ui-monospace, monospace;
  cursor: pointer;
}

.tn-frac-del:hover {
  background: var(--frac-card);
  color: var(--frac-accent);
  -webkit-text-fill-color: var(--frac-accent);
}

.tn-frac-del:focus-visible {
  outline: 2px solid var(--frac-accent);
  outline-offset: 2px;
}

.tn-frac-del-spacer {
  width: 28px;
  height: 28px;
}

.tn-frac-add {
  justify-self: start;
  height: 36px;
  padding: 0 14px;
  border: 1px dashed var(--frac-line);
  border-radius: 0;
  background: transparent;
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace !important;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.tn-frac-add:hover:not(:disabled) {
  border-color: var(--frac-ink);
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
}

.tn-frac-add:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tn-frac-add:focus-visible {
  outline: 2px solid var(--frac-accent);
  outline-offset: 2px;
}

/* Command row */
.tn-frac-command {
  display: grid;
  gap: 8px;
}

.tn-frac-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tn-frac-actions > button {
  display: grid;
  place-items: center;
  height: 40px;
  padding: 0 10px;
  border: 1px solid var(--frac-line);
  border-radius: 0;
  background: var(--frac-btn-sec-bg);
  color: var(--frac-btn-sec-text);
  -webkit-text-fill-color: var(--frac-btn-sec-text);
  font: 700 13px/1 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace !important;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.tn-frac-actions > button:hover {
  background: var(--frac-btn-sec-hover);
}

.tn-frac-actions > button:focus-visible {
  outline: 2px solid var(--frac-accent);
  outline-offset: 2px;
}

.tn-frac-actions > .tn-frac-primary {
  border-color: var(--frac-btn-pri-bg);
  background: var(--frac-btn-pri-bg);
  color: var(--frac-btn-pri-text);
  -webkit-text-fill-color: var(--frac-btn-pri-text);
}

.tn-frac-actions > .tn-frac-primary:hover {
  background: var(--frac-btn-pri-hover);
  border-color: var(--frac-btn-pri-hover);
}

.tn-frac-status {
  min-height: 18px;
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 600 12px/1.4 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.tn-frac-status[data-state="error"] { color: #b3341a; -webkit-text-fill-color: #b3341a; }
.tn-frac-status[data-state="success"] { color: #3f6d2f; -webkit-text-fill-color: #3f6d2f; }

/* Result pane */
.tn-frac-expression {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--frac-soft);
  background: var(--frac-card);
  min-height: 52px;
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
  font: 700 16px/1.2 Georgia, "Times New Roman", serif;
}

.tn-frac-placeholder {
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 500 12px/1.4 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Stacked fraction glyph (shared: expression + main result) */
.tn-frac-frac {
  display: inline-grid;
  justify-items: center;
  vertical-align: middle;
  font-variant-numeric: tabular-nums lining-nums;
}

.tn-frac-frac .tn-frac-n,
.tn-frac-frac .tn-frac-d {
  padding: 0 4px;
  line-height: 1.15;
}

.tn-frac-frac .tn-frac-bar {
  width: 100%;
  height: 1px;
  margin: 2px 0;
  background: currentColor;
}

.tn-frac-expr-op {
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font-weight: 700;
}

.tn-frac-main {
  display: grid;
  gap: 6px;
  padding: 16px 14px;
  border: 1px solid var(--frac-line);
  background: var(--frac-surface);
}

.tn-frac-main > span {
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 700 12px/1.2 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tn-frac-result-value {
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
  font: 700 34px/1.1 Georgia, "Times New Roman", serif;
}

.tn-frac-result-value .tn-frac-frac { font-size: 30px; }
.tn-frac-whole { font: 700 34px/1.1 Georgia, "Times New Roman", serif; }

.tn-frac-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tn-frac-metrics > div {
  display: grid;
  gap: 3px;
  padding: 9px 11px;
  border: 1px solid var(--frac-soft);
  background: var(--frac-card);
}

.tn-frac-metrics dt {
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 700 11px/1.2 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  letter-spacing: 0.02em;
}

.tn-frac-metrics dd {
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
  font: 700 15px/1.25 Georgia, "Times New Roman", serif;
  font-variant-numeric: tabular-nums lining-nums;
  overflow-wrap: anywhere;
}

.tn-frac-disclaimer {
  color: var(--frac-muted);
  -webkit-text-fill-color: var(--frac-muted);
  font: 500 11px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Mobile */
@media (max-width: 720px) {
  .tn-frac-grid { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .tn-frac-input { border-right: 0; border-bottom: 1px solid var(--frac-line); }
  .tn-frac-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* Dark / inverse / auto-dark (#8/#14): scheme tokens + text-fill */
body:is([data-scheme="dark"], [data-scheme="inverse"], [data-scheme="auto"][data-d="dark"], [data-scheme="auto"][data-l="dark"]):not([data-scheme="light"]) .tn-frac-tool,
html[data-scheme="dark"] body:not([data-scheme="light"]) .tn-frac-tool,
html[data-scheme="inverse"] body:not([data-scheme="light"]) .tn-frac-tool {
  --frac-ink: #efe6d2;
  --frac-muted: #c3b492;
  --frac-line: #6f6047;
  --frac-soft: #574a37;
  --frac-paper: #241d12;
  --frac-wash: #2c2417;
  --frac-surface: rgba(58, 48, 32, 0.5);
  --frac-card: rgba(58, 48, 32, 0.5);
  --frac-accent: #e8823f;
  --frac-btn-sec-bg: #33291a;
  --frac-btn-sec-hover: #453720;
  --frac-btn-sec-text: #efe6d2;
  --frac-btn-pri-bg: #e8823f;
  --frac-btn-pri-hover: #f2a061;
  --frac-btn-pri-text: #241206;
  color: var(--frac-ink);
  -webkit-text-fill-color: var(--frac-ink);
}

@media (prefers-color-scheme: dark) {
  body[data-scheme="auto"]:not([data-scheme="light"]) .tn-frac-tool {
    --frac-ink: #efe6d2;
    --frac-muted: #c3b492;
    --frac-line: #6f6047;
    --frac-soft: #574a37;
    --frac-paper: #241d12;
    --frac-wash: #2c2417;
    --frac-surface: rgba(58, 48, 32, 0.5);
    --frac-card: rgba(58, 48, 32, 0.5);
    --frac-accent: #e8823f;
    --frac-btn-sec-bg: #33291a;
    --frac-btn-sec-hover: #453720;
    --frac-btn-sec-text: #efe6d2;
    --frac-btn-pri-bg: #e8823f;
    --frac-btn-pri-hover: #f2a061;
    --frac-btn-pri-text: #241206;
    color: var(--frac-ink);
    -webkit-text-fill-color: var(--frac-ink);
  }
}