/* Built-in palettes. They sit in a cascade layer so that instance colors
   (/theme.css) and colors a visitor picks (set inline by theme.js) win. */
@layer palette {
  :root {
    color-scheme: light dark;
    --bg: #f6f7fb;
    --surface: #ffffff;
    --border: #dfe2ec;
    --text: #1c1f2a;
    --muted: #5f6578;
    --accent: #4f46e5;
    --accent-text: #ffffff;
    --danger: #c0262d;
    --weak: #d9480f;
    --fair: #e0a800;
    --strong: #2f9e44;
    --very-strong: #1971c2;
    --radius: 10px;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  }

  /* data-theme is system, light or dark (set by the server, then theme.js). */
  :root[data-theme="light"] { color-scheme: light; }
  :root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #12141b;
    --surface: #1b1e28;
    --border: #2d3140;
    --text: #e7e9f0;
    --muted: #9aa0b4;
    --accent: #7c74ff;
    --danger: #ff6b6b;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #12141b;
      --surface: #1b1e28;
      --border: #2d3140;
      --text: #e7e9f0;
      --muted: #9aa0b4;
      --accent: #7c74ff;
      --danger: #ff6b6b;
    }
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

header h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
.tagline { margin: 0.25rem 0 1.5rem; color: var(--muted); }

.tabs {
  display: inline-flex;
  gap: 0.25rem;
  padding: 0.25rem;
  margin-bottom: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.tabs button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.45rem 1rem;
  border-radius: 7px;
  font: inherit;
  cursor: pointer;
}

.tabs button[aria-selected="true"] { background: var(--accent); color: var(--accent-text); }

.output, .options {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.result {
  display: block;
  min-height: 3.5rem;
  padding: 0.75rem 0.9rem;
  font: 1.25rem/1.4 var(--mono);
  word-break: break-all;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  user-select: all;
}

.actions { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top: 0.75rem; }

button.primary, button.secondary {
  font: inherit;
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--accent);
}

button.primary { background: var(--accent); color: var(--accent-text); min-width: 6.5rem; }
button.secondary { background: transparent; color: var(--accent); }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.strength { margin-top: 1rem; }
.meter { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
#meter-fill { height: 100%; width: 0; transition: width 0.2s, background-color 0.2s; }
.strength-label { margin: 0.4rem 0 0; font-size: 0.9rem; color: var(--muted); }

.error { color: var(--danger); margin: 0.75rem 0 0; }

.field { margin-bottom: 1rem; }
.field > label { display: block; font-weight: 600; margin-bottom: 0.35rem; }
.value { font-weight: 400; color: var(--muted); }

.range-row { display: flex; gap: 0.75rem; align-items: center; }
input[type="range"] { flex: 1; width: 100%; accent-color: var(--accent); }

input[type="number"], input[type="text"] {
  font: inherit;
  padding: 0.35rem 0.5rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

input[type="number"] { width: 5rem; }
input[type="text"] { width: 8rem; font-family: var(--mono); }

fieldset { border: 0; padding: 0; margin: 0; }
legend { font-weight: 600; margin-bottom: 0.35rem; padding: 0; }
.check { display: flex; align-items: center; gap: 0.5rem; padding: 0.2rem 0; cursor: pointer; }
.check input { accent-color: var(--accent); width: 1rem; height: 1rem; }

code { font-family: var(--mono); font-size: 0.85em; color: var(--muted); }

.hint { margin: 0.75rem 0 0; font-size: 0.9rem; color: var(--muted); }
.hint.top { margin: 0 0 1rem; }
.hint.small { margin: 0.3rem 0 0; font-size: 0.8rem; }

.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0 1rem; }

select {
  font: inherit;
  width: 100%;
  padding: 0.4rem 0.5rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.symbol-picker { margin-bottom: 1rem; }
.fixed-toggle { margin-bottom: 0.75rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.chip { position: relative; cursor: pointer; }
.chip input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.chip span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  font: 1rem var(--mono);
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  user-select: none;
}
.chip input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.chip input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.chip-actions { display: flex; gap: 1rem; margin-top: 0.5rem; }
button.link {
  font: inherit;
  font-size: 0.9rem;
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  cursor: pointer;
}
button.link:hover { text-decoration: underline; }
a { color: var(--accent); }

footer { font-size: 0.85rem; color: var(--muted); }
footer code { word-break: break-all; }

.appearance { margin-bottom: 1rem; }
.appearance summary { cursor: pointer; font-weight: 600; color: var(--muted); }
.appearance[open] summary { margin-bottom: 1rem; }
.color-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 0.5rem 1rem; margin-top: 0.35rem; }
.color-field { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.color-field input[type="color"] {
  width: 2.2rem;
  height: 2.2rem;
  padding: 0.15rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}

.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 0.5rem; margin-top: 0.35rem; }
button.preset {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
}
button.preset:hover { border-color: var(--accent); }
button.preset[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); font-weight: 600; }
button.preset:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.preset-swatch {
  flex: none;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--swatch-bg) 0 50%, var(--swatch-accent) 50% 100%);
}