:root {
  color-scheme: dark;
  --bg: #0f1f22;
  --panel: #16282c;
  --card: #1e3238;
  --border: #335c67;
  --border-soft: #2a474f;
  --text: #eef2f1;
  --muted: #93a8ab;
  --accent: #e09f3e;
  --accent-hover: #c98a2e;
  --highlight: #fff3b0;
  --danger: #9e2a2b;
  --danger-hover: #540b0e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

h1 { font-size: 1.1rem; margin: 0 0 1rem; }
h2 { font-size: 1rem; margin: 0; }
h3 { font-size: 0.85rem; margin: 0.6rem 0 0.3rem; color: var(--accent); }

.hidden { display: none !important; }

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 53px);
}

.panel {
  background: var(--panel);
  padding: 1rem;
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.main {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 0.4rem; align-items: flex-start; }
.field label { display: flex; flex-direction: column; gap: 0.3rem; align-self: stretch; }
.field input { width: 100%; }

input[type="number"], input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  color: var(--text);
  padding: 0.4rem;
  border-radius: 4px;
}

button {
  background: var(--border);
  color: var(--text);
  border: none;
  padding: 0.5rem 0.7rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}

button:hover { background: var(--border-soft); }
button.primary { background: var(--accent); color: #241705; font-weight: 600; }
button.primary:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.5; cursor: default; }

.checkbox { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; }

.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--border);
  color: var(--text);
  font-size: 0.7rem;
  cursor: help;
}

fieldset { border: 1px solid var(--border-soft); border-radius: 4px; }
#mechanics { display: flex; flex-direction: column; gap: 0.2rem; }
#mechanics label { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; }

.muted { color: var(--muted); font-size: 0.85rem; }

.start-picker {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 1.2rem;
}

.chain-display {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.chain-word {
  background: var(--border);
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.undo-x {
  background: none;
  border: none;
  color: var(--muted);
  padding: 0;
  font-size: 0.8rem;
  line-height: 1;
  cursor: pointer;
}

.undo-x:hover { color: var(--danger); background: none; }

.chain-arrow { color: var(--muted); font-size: 0.8rem; }

.options-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.options-buttons { display: flex; gap: 0.5rem; }

.options-groups { display: flex; flex-direction: column; gap: 0.4rem; }
.options-group h3 { border-bottom: 1px solid var(--border-soft); padding-bottom: 0.2rem; }

.options-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.option-btn {
  background: var(--card);
  border: 1px solid var(--border-soft);
}

.option-btn .freq { color: var(--muted); font-size: 0.75rem; margin-left: 0.3rem; }

.option-btn.used {
  border-color: var(--danger);
  background: rgba(158, 42, 43, 0.2);
}

.option-btn.used .freq { color: #e08c8c; }

textarea {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.8rem;
}

.tabs {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border-soft);
}

.tabs-left { display: flex; gap: 0.25rem; }
.tabs-right { display: flex; gap: 0.5rem; }

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  color: var(--muted);
  padding: 0.9rem 1rem;
}

.tab-btn:hover { background: none; color: var(--text); }

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

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  padding: 0.45rem 0.8rem;
  border-radius: 5px;
}

.icon-btn.primary { background: var(--accent); color: #241705; font-weight: 600; }
.icon-btn.primary:hover { background: var(--accent-hover); }
.icon-btn.danger { background: var(--danger); color: #fdeaea; }
.icon-btn.danger:hover { background: var(--danger-hover); }

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

.definitions-main {
  padding: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.def-filters {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 0.6rem 0.8rem;
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
}

.def-group { margin-bottom: 2rem; }
.def-group h2 {
  font-size: 1rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 0.4rem;
  margin-bottom: 0.8rem;
  cursor: pointer;
  user-select: none;
}

.def-group h2::before {
  content: '▾ ';
  font-size: 0.8rem;
}

.def-group.collapsed h2::before { content: '▸ '; }
.def-group.collapsed .def-group-body { display: none; }

.def-card {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin-bottom: 1rem;
}

.def-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.chain-id { color: var(--muted); font-size: 0.75rem; font-family: monospace; }
.chain-words { font-weight: 600; }
.word-count { color: var(--highlight); font-weight: 700; font-size: 0.85rem; }

.status-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  text-transform: uppercase;
}

.status-badge.status-draft { background: var(--border-soft); color: var(--muted); }
.status-badge.status-inProgress { background: var(--accent); color: #241705; }
.status-badge.status-ready { background: var(--highlight); color: #3a2c00; }

.def-steps { display: flex; flex-direction: column; gap: 0.5rem; }

.def-step {
  display: grid;
  grid-template-columns: 90px auto 1fr;
  gap: 0.8rem;
  align-items: start;
  padding: 0.4rem 0;
  border-top: 1px solid var(--border-soft);
}

.def-step:first-child { border-top: none; }

.def-step-first { grid-template-columns: 90px; opacity: 0.85; }

.def-step-word { display: flex; flex-direction: column; gap: 0.1rem; font-size: 0.85rem; }
.def-step-word .muted { font-size: 0.7rem; }

.letters-box { display: flex; align-items: center; gap: 0.3rem; }

.letter-tile {
  width: 1.8rem;
  height: 1.8rem;
  text-align: center;
  border-radius: 4px;
  text-transform: uppercase;
  font-family: monospace;
  padding: 0;
}

.letter-tile.correct {
  background: var(--highlight);
  color: #3a2c00;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  font-weight: 700;
}

.decoy-input {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  color: var(--text);
}

.regen-btn {
  padding: 0.2rem 0.4rem;
  font-size: 0.9rem;
}

.def-step-definition textarea { font-family: system-ui, sans-serif; font-size: 0.85rem; }

.export-main {
  padding: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.export-main code {
  background: var(--border);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.85rem;
}

#exportOutput {
  font-size: 0.75rem;
}