/* merkmal page styles.
 *
 * Sourcehut-inspired: flat, one background, hairline rules instead of cards,
 * plain bold headings, default-blue links, and a single dark-red accent used
 * only for selection state. Hybrid type: sans for prose, monospace for data,
 * tables, labels and headings. Matches regulae's visual language. */

:root {
  --bg: #ffffff;
  --ink: #1a1a1a;
  --muted: #5a5a5a;
  --line: #dcdcdc;
  --link: #0b4fd8;
  --accent: #8b1a1a;
  --accent-soft: #faf2f2;
  --hover: #f4f4f4;
  --warn: #8a5b12;
  --ok: #1a6b3a;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Cantarell, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --ink: #e2e2e2;
    --muted: #a0a0a0;
    --line: #383838;
    --link: #8ab4ff;
    --accent: #d97b7b;
    --accent-soft: #2a1c1c;
    --hover: #222222;
    --warn: #d9bc72;
    --ok: #5cb87a;
  }
}

* { box-sizing: border-box; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14.5px/1.5 var(--sans);
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px 80px; }

/* ---- header ---------------------------------------------------------- */

.top {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 0 -20px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.top h1 { font: 600 17px/1.2 var(--mono); margin: 0; }
.top .version { color: var(--muted); font-size: 12px; font-family: var(--mono); }
.top .spacer { flex: 1; }
.top a { font-size: 13.5px; }

.tagline { margin: 12px 0 0; font-size: 14.5px; color: var(--muted); }

.status-banner {
  margin: 14px 0 0;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}
.status-banner strong { color: var(--ink); }

/* ---- boundary block -------------------------------------------------- */

.boundary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 18px 0 0;
}
.boundary section { padding: 0; }
.boundary section + section { border-left: 1px solid var(--line); padding-left: 24px; }
.boundary h2 { margin: 0 0 6px; font: 600 13px/1.4 var(--mono); }
.boundary ul { margin: 0; padding-left: 18px; }
.boundary li { margin: 3px 0; font-size: 13.5px; }
.boundary .is-not li { color: var(--muted); }

/* ---- controls -------------------------------------------------------- */

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 20px 0 10px;
  flex-wrap: wrap;
}
.controls label { font-size: 12.5px; color: var(--muted); font-family: var(--mono); }
.controls .spacer { flex: 1; }
.controls .system-kind { font-size: 12px; color: var(--muted); font-family: var(--mono); }

select, button {
  font: inherit;
  font-size: 13.5px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
}
select:hover, button:hover { border-color: var(--ink); }
select { max-width: 340px; }
button.primary { background: var(--ink); border-color: var(--ink); color: var(--bg); }
button.primary:hover { background: var(--accent); border-color: var(--accent); }
button:disabled { opacity: 0.45; cursor: default; }
button:disabled:hover { border-color: var(--line); }

/* ---- custom model ---------------------------------------------------- */

.custom-model {
  margin: 4px 0 0;
  font-size: 13px;
}
.custom-model > summary {
  cursor: pointer;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 4px 0;
}
.custom-model textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  font: 12.5px/1.5 var(--mono);
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--bg);
  color: var(--ink);
  margin: 6px 0;
  tab-size: 12;
}
.custom-model textarea:focus { border-color: var(--ink); outline: none; }
.model-controls { display: flex; align-items: center; gap: 10px; }
.model-status { font-size: 12.5px; font-family: var(--mono); }
.model-status.ok { color: var(--ok); }
.model-status.err { color: var(--accent); }

/* ---- IPA keyboard ---------------------------------------------------- */

.ipa-kbd {
  margin: 4px 0 0;
  font-size: 13px;
}
.ipa-kbd > summary {
  cursor: pointer;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 4px 0;
}
.ipa-grid {
  padding: 6px 0;
}
.ipa-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin-bottom: 3px;
}
.ipa-label {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  width: 68px;
  flex-shrink: 0;
  text-align: right;
  padding-right: 6px;
}
.ipa-row button {
  min-width: 28px;
  height: 28px;
  padding: 0 4px;
  font-size: 15px;
  line-height: 28px;
  text-align: center;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--sans);
}
.ipa-row button:hover {
  background: var(--hover);
  border-color: var(--ink);
}
.ipa-row button:active {
  background: var(--accent-soft);
  border-color: var(--accent);
}

/* ---- tabs ------------------------------------------------------------ */

.tabs {
  display: flex;
  gap: 4px;
  margin: 16px 0 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.tab {
  font: 12.5px var(--mono);
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
}
.tab:hover { border-color: var(--ink); color: var(--ink); }
.tab.on { border-color: var(--accent); color: var(--accent); }

/* ---- tab content ----------------------------------------------------- */

.tab-content { margin: 16px 0 0; }

.tool-input {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.tool-input input[type="text"] {
  font: 13.5px/1.5 var(--mono);
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--bg);
  color: var(--ink);
  min-width: 200px;
}
.tool-input input:focus { border-color: var(--ink); outline: none; }

.tool-options {
  display: flex;
  align-items: center;
  gap: 6px 14px;
  margin: 8px 0 0;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
  font-family: var(--mono);
}
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { cursor: pointer; }

/* ---- results --------------------------------------------------------- */

.result { margin: 14px 0 0; }
.result:empty { display: none; }

.result-error {
  padding: 8px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.result-error .what { font-weight: 600; color: var(--accent); }
.result-error .detail { color: var(--muted); font-size: 13.5px; margin-top: 4px; }
.result-error .hint { color: var(--muted); font-size: 13px; margin-top: 4px; font-family: var(--mono); }

/* ---- feature chips --------------------------------------------------- */

.feature-list {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin: 8px 0;
}
.feature-chip {
  font: 12.5px var(--mono);
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink);
}

/* ---- vector table ---------------------------------------------------- */

.vector-section { margin: 14px 0 0; }
.vector-section h3 { font: 600 13px/1.4 var(--mono); margin: 0 0 6px; }

.scroll { max-height: 50vh; overflow: auto; border: 1px solid var(--line); }

table.vector { width: 100%; border-collapse: collapse; font-size: 13px; }
table.vector th {
  position: sticky; top: 0; background: var(--bg); text-align: left;
  font: 600 12px/1.4 var(--mono); color: var(--muted);
  padding: 6px 10px; border-bottom: 1px solid var(--line); z-index: 1;
}
table.vector td { padding: 5px 10px; border-bottom: 1px solid var(--line); }
table.vector td:first-child { font-family: var(--mono); color: var(--muted); }
table.vector td:last-child {
  font-family: var(--mono); text-align: right;
  font-variant-numeric: tabular-nums;
}
table.vector tr:hover td { background: var(--hover); }
table.vector td.pos { color: var(--ok); }
table.vector td.neg { color: var(--accent); }
table.vector td.zero { color: var(--muted); }

/* ---- distance display ------------------------------------------------ */

.distance-display {
  padding: 10px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.distance-value {
  font: 600 20px/1.4 var(--mono);
  font-variant-numeric: tabular-nums;
}
.distance-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  margin: 6px 0 0;
  font-size: 13px; font-family: var(--mono); color: var(--muted);
}
.distance-meta b { font-weight: 600; color: var(--ink); }
.coverage-bar {
  display: inline-block; width: 60px; height: 3px;
  background: var(--line); vertical-align: middle; margin-left: 4px;
}
.coverage-fill { display: block; height: 100%; background: var(--accent); }

/* ---- segment chips --------------------------------------------------- */

.segment-preview {
  display: flex; gap: 4px; flex-wrap: wrap; align-items: center;
  font-family: var(--mono); font-size: 13px; min-height: 1.6em;
  margin: 8px 0;
}
.grapheme {
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 0;
}
.grapheme.unknown { color: var(--warn); border-color: var(--warn); }

/* ---- distance matrix ------------------------------------------------- */

.matrix-scroll { overflow: auto; border: 1px solid var(--line); max-height: 70vh; }

table.matrix { border-collapse: collapse; font-size: 12.5px; font-family: var(--mono); }
table.matrix th {
  position: sticky; background: var(--bg);
  font-weight: 600; font-size: 12px; color: var(--muted);
  padding: 5px 8px; border-bottom: 1px solid var(--line);
  white-space: nowrap; z-index: 1;
}
table.matrix th:first-child { left: 0; z-index: 2; }
table.matrix th.corner { top: 0; left: 0; z-index: 3; }
table.matrix thead th { top: 0; }
table.matrix tbody th { text-align: right; border-right: 1px solid var(--line); left: 0; }
table.matrix td {
  padding: 4px 8px; border-bottom: 1px solid var(--line);
  text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap;
}
table.matrix tr:hover td, table.matrix tr:hover th { background: var(--hover); }
table.matrix td.zero { color: var(--muted); }
table.matrix td.null { color: var(--line); }
table.matrix th.unknown { color: var(--warn); }

/* ---- loading --------------------------------------------------------- */

.loading {
  padding: 10px 0;
  font-size: 13.5px;
  color: var(--muted);
  font-family: var(--mono);
}

/* ---- responsive ------------------------------------------------------ */

@media (max-width: 900px) {
  .boundary { grid-template-columns: 1fr; }
  .boundary section + section {
    border-left: 0; padding-left: 0;
    border-top: 1px solid var(--line); padding-top: 14px;
  }
}