:root {
  --bg: #ffffff;
  --bg-panel: #f6f7f9;
  --fg: #1c1e21;
  --fg-muted: #5a6270;
  --border: #dde1e6;
  --accent: #2f6fed;
  --accent-fg: #ffffff;
  --error-bg: #fdecea;
  --error-fg: #92140c;
  --error-border: #f3b4ac;
  --ok-bg: #eaf7ee;
  --ok-fg: #0f6b34;
  --ok-border: #b6e3c6;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --mark-colors: #ffe58a, #a8d8ff, #c9f2c0, #ffc9de, #e0c8ff, #ffd9ad;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --bg-panel: #1c1f24;
    --fg: #e7e9ec;
    --fg-muted: #9aa2b1;
    --border: #2c3038;
    --accent: #6c9bff;
    --accent-fg: #0b1020;
    --error-bg: #3a1a17;
    --error-fg: #ff9d90;
    --error-border: #6b2d26;
    --ok-bg: #123321;
    --ok-fg: #7fe3ab;
    --ok-border: #1f5c3a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

header, main, footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.6rem;
}
header h1 .sub {
  font-weight: 400;
  color: var(--fg-muted);
  font-size: 1rem;
}
header .tagline {
  color: var(--fg-muted);
  max-width: 68ch;
}
header .tagline code { font-family: var(--mono); }
header .tagline a { color: var(--accent); }

main {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 860px) {
  main { grid-template-columns: 1fr 1fr; align-items: start; }
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}

.pattern-row {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--mono);
  font-size: 1.05rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
}
.pattern-row .slash { color: var(--fg-muted); }
.pattern-row input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  color: var(--fg);
  outline: none;
  min-width: 0;
}
.flags-display {
  color: var(--accent);
  font-weight: 600;
  min-width: 1.5em;
}

fieldset.flags {
  border: none;
  padding: 0;
  margin: 0.85rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
}
fieldset.flags legend {
  font-size: 0.8rem;
  color: var(--fg-muted);
  padding: 0;
  margin-bottom: 0.3rem;
}
fieldset.flags label {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  font-family: var(--mono);
  cursor: pointer;
  user-select: none;
}
fieldset.flags label small {
  font-family: inherit;
  color: var(--fg-muted);
  font-size: 0.72rem;
}
fieldset.flags input { accent-color: var(--accent); cursor: pointer; }

.subject-label, .presets label {
  display: block;
  font-size: 0.8rem;
  color: var(--fg-muted);
  margin: 0.9rem 0 0.3rem;
}

textarea#subject {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.95rem;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem;
  resize: vertical;
}

.presets { margin-top: 0.9rem; }
.presets select {
  width: 100%;
  font: inherit;
  padding: 0.4rem 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
}

.status {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  margin-bottom: 0.8rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg-muted);
}
.status.ok { background: var(--ok-bg); color: var(--ok-fg); border-color: var(--ok-border); }
.status.error { background: var(--error-bg); color: var(--error-fg); border-color: var(--error-border); }
.status.crash { background: var(--error-bg); color: var(--error-fg); border-color: var(--error-border); font-weight: 600; }

.highlighted {
  font-family: var(--mono);
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem;
  margin-bottom: 1rem;
  min-height: 2.5em;
}
.highlighted mark {
  border-radius: 3px;
  padding: 0 1px;
  color: #1c1e21;
}

table.match-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.85rem;
}
table.match-table caption {
  text-align: left;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-bottom: 0.35rem;
}
table.match-table th, table.match-table td {
  text-align: left;
  padding: 0.35rem 0.5rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.match-table th { color: var(--fg-muted); font-weight: 600; font-size: 0.78rem; }
table.match-table tr.match-header td {
  font-weight: 600;
  background: var(--bg);
  padding-top: 0.6rem;
}
table.match-table .swatch {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  border-radius: 2px;
  margin-right: 0.4em;
  vertical-align: middle;
}
table.match-table .unmatched { color: var(--fg-muted); font-style: italic; }
table.match-table + table.match-table { margin-top: 1rem; }

.no-matches { color: var(--fg-muted); font-size: 0.9rem; }

footer {
  color: var(--fg-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}
footer code { font-family: var(--mono); }
footer a { color: var(--accent); }