:root {
  --bg: #f8f4ef;
  --panel: #ffffff;
  --ink: #2a2a2a;
  --muted: #6d6d6d;
  --accent: #7a5c3c;
  --accent-2: #c86b3a;
  --border: #e7dfd6;
  --shadow: rgba(0, 0, 0, 0.08);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Atkinson Hyperlegible", "Inter", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: radial-gradient(circle at top left, #fff9f2 0%, #f5efe7 45%, #f0e6db 100%);
}

.app {
  max-width: 1180px;
  margin: 24px auto 40px;
  padding: 0 20px;
  display: grid;
  gap: 16px;
  align-items: start;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  grid-column: 1 / -1;
}

h1 {
  margin: 0 0 4px 0;
  font-size: 32px;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.badge {
  background: #1f1b16;
  color: #fef7ef;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 6px;
  font-size: 12px;
  background: #fffdfb;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 12px 26px var(--shadow);
}

.input-panel {
  display: grid;
  gap: 6px;
}

.rules-panel {
  display: grid;
  gap: 12px;
}

.left-col {
  display: grid;
  gap: 12px;
}

.info-panel {
  font-size: 12px;
  color: var(--ink);
}

.info-title {
  margin: 0 0 6px 0;
  font-size: 14px;
}

.label {
  font-weight: 600;
  font-size: 12px;
  color: var(--muted);
}

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3px 5px;
  font-size: 12px;
  line-height: 1.35;
  min-height: 42px;
  font-family: var(--mono);
  background: #fffdfb;
  resize: vertical;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.row.compact {
  align-items: center;
  font-size: 11px;
  color: var(--muted);
}

button {
  border: none;
  padding: 4px 7px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 11px;
  background: var(--accent);
  color: white;
  cursor: pointer;
}

button#btnReset {
  background: #c2b9ae;
  color: #2a2a2a;
}

.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
}

button:hover {
  filter: brightness(1.05);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.stack {
  display: grid;
  gap: 4px;
}

.output {
  min-height: 36px;
  background: #fbf6f0;
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 6px;
  font-family: var(--mono);
  white-space: pre-wrap;
}

.history {
  display: grid;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  max-height: 200px;
  overflow: auto;
  padding-right: 4px;
}

.history-item {
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fffdfb;
}

.rules {
  display: grid;
  gap: 10px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff7ee;
  cursor: pointer;
  font-size: 13px;
}

.tab.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.tab input {
  margin: 0;
}

.rule-fields {
  display: grid;
  gap: 4px;
}

.rule-fields input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px 6px;
  font-family: var(--mono);
  font-size: 12px;
  background: #fffdfb;
}

.rule-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.rule-actions button {
  padding: 4px 8px;
  font-size: 12px;
}

.rule-error {
  color: #a13a2d;
  font-size: 12px;
}

.rule-group {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: #fffdfb;
}

.rule-group h3 {
  margin: 0 0 6px 0;
  font-size: 15px;
}

.rule-item {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 6px;
  padding: 6px 0;
  border-top: 1px dashed #eee3d9;
}

.rule-item:first-of-type {
  border-top: none;
}

.rule-condition {
  color: var(--muted);
  font-size: 12px;
}

.rule-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto;
  gap: 6px;
  align-items: center;
}

.rule-row .arrow {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

.rule-row.two {
  grid-template-columns: 1fr 1fr;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(10, 8, 6, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-card {
  background: #fffdfb;
  border-radius: 16px;
  border: 1px solid var(--border);
  max-width: 640px;
  width: 100%;
  box-shadow: 0 24px 60px var(--shadow);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  margin: 0;
  font-size: 18px;
}

.modal-body {
  padding: 12px 16px 18px;
  font-size: 14px;
  color: var(--ink);
}

.modal-body ul {
  margin: 8px 0 12px;
  padding-left: 18px;
}

@media (min-width: 960px) {
  .app {
    grid-template-columns: 1.2fr 1fr;
  }
}