:root {
  --bg: #0f1014;
  --panel: #181c24;
  --panel-2: #1f2530;
  --border: #2a3140;
  --fg: #e6ecf2;
  --muted: #8b95a3;
  --accent: #7cc4ff;
  --accent-dim: #4a7aa8;
  --match: #facc15;
  --match-bg: rgba(250, 204, 21, 0.18);
  --error: #ff7c8a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

code {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  background: var(--panel);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.88em;
}

header {
  max-width: 980px;
  margin: 28px auto 16px;
  padding: 0 20px;
}

h1 {
  margin: 0 0 6px;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 72ch;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* ── Catalog ── */

.catalog {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.cat-head {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 6px;
}

.cat-tokens {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.token-btn {
  background: var(--panel-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 10px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
}

.token-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Sequence ── */

.sequence {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 50px;
  padding: 6px;
  background: #0c0e13;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.empty-hint {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 4px 4px 10px;
  font-size: 0.85rem;
  cursor: grab;
}

.chip-label {
  color: var(--fg);
}

.chip-input {
  background: #0c0e13;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.82rem;
  width: 80px;
  outline: none;
}

.chip-input:focus { border-color: var(--accent); }

.chip-out {
  background: rgba(124, 196, 255, 0.1);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.82rem;
}

.chip-del {
  background: transparent;
  color: var(--muted);
  border: none;
  border-radius: 3px;
  width: 22px;
  height: 22px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.chip-del:hover { color: var(--error); }

.action {
  margin-top: 10px;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}

.action:hover { color: var(--error); border-color: var(--error); }

/* ── Regex display ── */

.regex-row {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #0c0e13;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  flex-wrap: wrap;
}

.regex-slash {
  color: var(--muted);
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 1.1rem;
}

.regex-out {
  flex: 1;
  background: transparent;
  color: var(--accent);
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 1rem;
  padding: 0;
  word-break: break-all;
  min-width: 0;
}

.flags {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.95rem;
  width: 60px;
  outline: none;
}

.regex-error {
  margin-top: 8px;
  color: var(--error);
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.85rem;
  padding: 4px 8px;
  background: rgba(255, 124, 138, 0.08);
  border-radius: 4px;
}

.flag-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
  font-size: 0.85rem;
}

.flag-toggles label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
  cursor: pointer;
}

.flag-toggles label:hover { color: var(--fg); }

/* ── Test panel ── */

#testInput {
  width: 100%;
  background: #0c0e13;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.9rem;
  min-height: 70px;
  resize: vertical;
  outline: none;
}

#testInput:focus { border-color: var(--accent); }

.match-row {
  display: flex;
  justify-content: space-between;
  margin: 10px 0 6px;
}

.match-count {
  font-size: 0.82rem;
  color: var(--accent);
}

.highlighted {
  background: #0c0e13;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  min-height: 80px;
}

mark {
  background: var(--match-bg);
  color: var(--match);
  border-bottom: 2px solid var(--match);
  border-radius: 2px;
  padding: 0 2px;
}

footer {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
  line-height: 1.6;
}

footer code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.8rem;
}

@media (max-width: 720px) {
  .catalog { grid-template-columns: repeat(2, 1fr); }
}