:root {
  --bg: #f9f9f9;
  --card: #fff;
  --border: #e0e0e0;
  --text: #111;
  --muted: #777;
  --accent: #09ed4d;
  --success: #16a34a;
  --warning: #d97706;
  --error: #dc2626;
  --mono: monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}

code,
pre,
textarea,
.mono {
  font-family: var(--mono);
}

/* Layout */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px;
}
.hero {
  margin-bottom: 16px;
}
.hero h1 {
  margin: 0 0 4px;
  font-size: 1.4rem;
}
.hero p {
  margin: 0;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.card-header h2 {
  margin: 0;
  font-size: 0.9rem;
}

/* Buttons */
.button {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  background: var(--card);
  color: var(--text);
}
.button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.button.primary:hover:not(:disabled) {
  opacity: 0.88;
}
.button.secondary:hover:not(:disabled) {
  background: #f3f3f3;
}

.example-actions,
.action-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* Input */
.input-card textarea {
  width: 100%;
  min-height: 480px;
  border: none;
  padding: 14px;
  resize: vertical;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  line-height: 1.6;
  outline: none;
}

.editor-hint {
  padding: 0 14px 10px;
  color: var(--muted);
  font-size: 0.78rem;
}

/* Output */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.tab-list {
  display: flex;
  gap: 4px;
}

.tab {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 0.82rem;
  cursor: pointer;
}
.tab:hover {
  background: #f0f0f0;
  color: var(--text);
}
.tab.is-active {
  background: #e8f0ff;
  color: var(--accent);
  font-weight: 600;
}

.status {
  display: flex;
  gap: 6px;
  align-items: center;
  color: var(--muted);
  font-size: 0.82rem;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ccc;
  flex-shrink: 0;
}
.status-dot[data-state="working"] {
  background: var(--warning);
}
.status-dot[data-state="ok"] {
  background: var(--success);
}
.status-dot[data-state="err"] {
  background: var(--error);
}

.output-content {
  min-height: 480px;
  padding: 14px;
  overflow: auto;
}

/* States */
.empty-state,
.loading-state {
  display: grid;
  place-items: center;
  min-height: 420px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 24px;
  color: var(--muted);
}
.empty-state h3,
.loading-state h3 {
  margin: 0 0 4px;
  font-size: 0.95rem;
  color: var(--text);
}
.empty-state p,
.loading-state p {
  margin: 0;
  font-size: 0.85rem;
}

.spinner {
  width: 24px;
  height: 24px;
  margin: 0 auto 10px;
  border: 2px solid #e0e0e0;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Sections */
.section + .section {
  margin-top: 16px;
}
.section-title {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.metric-grid,
.pill-grid {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.metric-card,
.pill-card,
.equation-row,
.json-block,
.table-wrap,
.error-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.metric-card {
  padding: 12px;
}
.metric-value {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
}
.metric-label {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.pill-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
}
.pill-key {
  font-weight: 600;
}
.pill-value {
  color: var(--accent);
  font-size: 0.85rem;
}

.equation-list {
  display: grid;
  gap: 6px;
}
.equation-row {
  display: grid;
  grid-template-columns: 80px 14px 1fr;
  gap: 6px;
  align-items: start;
  padding: 10px 12px;
}
.equation-signal {
  font-weight: 600;
  color: var(--accent);
}
.equation-equals {
  color: var(--muted);
}
.equation-expression {
  word-break: break-word;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Table */
.summary-note {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.table-wrap {
  overflow: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
th,
td {
  padding: 8px 10px;
  text-align: center;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
th:last-child,
td:last-child {
  border-right: none;
}
thead th {
  background: #f5f5f5;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
tbody tr:last-child td {
  border-bottom: none;
}
tbody tr.is-dont-care {
  color: var(--muted);
}
.bit-high {
  color: var(--success);
  font-weight: 600;
}
.bit-dont-care {
  color: #bbb;
}

/* JSON / Error */
.json-block {
  margin: 0;
  padding: 14px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  font-size: 0.82rem;
  overflow: auto;
}
.error-box {
  padding: 12px 14px;
  color: var(--error);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* Responsive */
@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }
  .input-card textarea,
  .output-content {
    min-height: 320px;
  }
}
@media (max-width: 600px) {
  .card-header,
  .toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .equation-row {
    grid-template-columns: 1fr;
  }
}