:root {
  --bg-page: #0a0a0a;
  --bg-card: #141414;
  --bg-input: #171717;
  --border: #262626;
  --text-strong: #ffffff;
  --text-body: #d4d4d4;
  --text-muted: #a3a3a3;
  --text-faint: #737373;
  --ok: #22c55e;
  --warn: #f59e0b;
  --error: #ef4444;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-body);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

.page {
  max-width: 42rem; /* max-w-2xl */
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* --- header --- */
.head {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-strong);
}

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

/* --- card --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
}

.input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  color: #f5f5f5;
  font-size: 0.9375rem;
  font-family: var(--mono);
}

.input::placeholder {
  color: var(--text-faint);
}

.input:focus {
  outline: none;
  border-color: #404040;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-primary {
  background: #ffffff;
  color: #000000;
  border: none;
  border-radius: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

.btn-primary:hover {
  background: #e5e5e5;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: default;
}

.trace-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
}

.trace-toggle input {
  accent-color: #d4d4d4;
}

/* --- output --- */
.output {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: fade-in 0.2s ease-out;
}

.result-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.result-desc {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-strong);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1.5rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field-key {
  font-size: 0.75rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field-val {
  color: var(--text-body);
}

.field-val.mono {
  font-family: var(--mono);
  color: #f5f5f5;
}

/* --- matched badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.badge-ok {
  background: rgba(34, 197, 94, 0.15);
  color: var(--ok);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-warn {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warn);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-llm {
  background: rgba(99, 179, 237, 0.15);
  color: #63b3ed;
  border: 1px solid rgba(99, 179, 237, 0.3);
}

.badge-llm-off {
  background: transparent;
  color: var(--text-faint);
  border: 1px solid var(--border);
}

.result-badges {
  display: inline-flex;
  gap: 0.375rem;
  align-items: center;
  white-space: nowrap;
}

/* --- error --- */
.error-card {
  background: var(--bg-card);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  color: var(--error);
  animation: fade-in 0.2s ease-out;
}

/* --- trace --- */
.trace {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.trace-title {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
}

.slots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.slot {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-body);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  padding: 0.2rem 0.5rem;
}

.alts {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.alts th,
.alts td {
  text-align: left;
  padding: 0.375rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.alts th {
  color: var(--text-faint);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
}

.alts td.mono {
  font-family: var(--mono);
  color: #f5f5f5;
}

.alts td.num {
  font-family: var(--mono);
  color: var(--text-muted);
  text-align: right;
}

/* --- settings card --- */
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.key-input-row {
  display: flex;
  gap: 0.5rem;
}

.key-input-row .input {
  flex: 1;
}

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn-secondary:hover {
  color: var(--text-body);
  border-color: #404040;
}

.toggle-row {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.toggle-row input {
  accent-color: #d4d4d4;
}

.settings-msg {
  font-size: 0.8125rem;
  color: var(--ok);
}

.settings-msg.error {
  color: var(--error);
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}