/* TextShift — styles
   Design intent: a quiet, editor-like tool (not a marketing page). Two-pane text
   surfaces are the hero. One ink-teal accent does all the pointing; nothing else
   competes with it. No cards-with-shadows, no rounded-pill buttons everywhere. */

:root {
  --paper: #f6f5f1;
  --paper-raised: #ffffff;
  --ink: #1e2320;
  --ink-soft: #565f5a;
  --line: #d8d5cc;
  --accent: #2f6f6b;
  --accent-ink: #ffffff;
  --accent-soft: #e4efee;
  --warn: #b5501f;
  --danger: #a5322a;
  --danger-bg: #fbeceb;
  --radius: 3px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  --paper: #14181a;
  --paper-raised: #1b2022;
  --ink: #e7ebe8;
  --ink-soft: #93a09a;
  --line: #303a38;
  --accent: #5fb3ac;
  --accent-ink: #0d1413;
  --accent-soft: #1d2c2b;
  --warn: #e08a4f;
  --danger: #e2685f;
  --danger-bg: #2a1c1b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px 10px;
  max-width: 1080px;
  margin: 0 auto;
}

.brand { display: flex; align-items: baseline; gap: 10px; }

.brand-mark {
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: var(--radius);
  padding: 2px 7px;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.brand-name { font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }

.icon-btn {
  border: 1px solid var(--line);
  background: var(--paper-raised);
  color: var(--ink-soft);
  border-radius: var(--radius);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-soft); }

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

.tabs {
  max-width: 1080px;
  margin: 6px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow-x: auto;
}

.tab {
  background: none;
  border: none;
  font: inherit;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 10px 14px 12px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.tab:hover { color: var(--ink); }

.tab.active { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- layout ---------- */

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
}

.panel { display: none; }
.panel.active { display: block; }

.options-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-bottom: 16px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.options-bar label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.options-bar select {
  font: inherit;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 5px 8px;
}

.options-bar .checkbox { gap: 7px; cursor: pointer; }
.options-bar input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.editor-grid.single { grid-template-columns: 1fr 1fr; }

@media (max-width: 860px) {
  .editor-grid, .editor-grid.single { grid-template-columns: 1fr; }
}

.editor-col { display: flex; flex-direction: column; min-width: 0; }

.editor-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.counts { font-family: var(--font-mono); font-size: 11.5px; }

.editor {
  width: 100%;
  min-height: 280px;
  resize: vertical;
  background: var(--paper-raised);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  font: inherit;
  line-height: 1.55;
}

.editor:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.editor[readonly] { background: var(--paper); }

.editor-actions {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}
.editor-actions.center { justify-content: center; margin: 18px 0; }

.btn {
  font: inherit;
  font-weight: 500;
  border-radius: var(--radius);
  padding: 8px 16px;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.primary:disabled { opacity: 0.55; cursor: progress; }

.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn.ghost:hover { border-color: var(--ink-soft); }

.status-row { min-height: 20px; margin-top: 12px; font-size: 13px; }
.status-row .error { color: var(--danger); background: var(--danger-bg); padding: 8px 12px; border-radius: var(--radius); display: inline-block; }
.status-row .loading { color: var(--ink-soft); }
.status-row .loading::after { content: "…"; }

/* ---------- detector / compare result panels ---------- */

.detector-result, .compare-result {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-height: 280px;
}

.compare-result:empty { display: none; }

.empty-hint { color: var(--ink-soft); font-size: 13.5px; margin: 0; }

.score-row { margin-bottom: 14px; }
.score-label { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 4px; }
.score-track { height: 7px; background: var(--accent-soft); border-radius: 4px; overflow: hidden; }
.score-fill { height: 100%; background: var(--accent); }
.score-fill.warn { background: var(--warn); }

.badge {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  text-transform: none;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-left: 8px;
}

.observations { margin: 14px 0 0; padding-left: 18px; font-size: 13.5px; }
.observations li { margin-bottom: 4px; }

.explanation { font-size: 13.5px; margin-top: 12px; }

.disclaimer {
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 10px;
}

.stat-table { width: 100%; border-collapse: collapse; font-size: 13.5px; margin-bottom: 16px; }
.stat-table th, .stat-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.stat-table th { color: var(--ink-soft); font-weight: 500; }
.stat-table td.num { font-family: var(--font-mono); }

.compare-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 860px) { .compare-columns { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */

.site-footer {
  max-width: 1080px;
  margin: 8px auto 40px;
  padding: 16px 24px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12.5px;
}