:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-alt: #f0f1f4;
  --border: #e0e2e8;
  --text: #1a1d24;
  --text-muted: #5b616e;
  --accent: #4f5fe0;
  --accent-ink: #ffffff;
  --danger: #d64545;
  --danger-bg: #fdecec;
  --safe: #1f9d55;
  --safe-bg: #e9f9ef;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 22, 30, 0.06), 0 4px 16px rgba(20, 22, 30, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c;
    --surface: #1c1f27;
    --surface-alt: #23262f;
    --border: #2c3040;
    --text: #ecedf1;
    --text-muted: #9498a4;
    --accent: #8b93ff;
    --accent-ink: #14161c;
    --danger: #ff6b6b;
    --danger-bg: #3a1f22;
    --safe: #4ade80;
    --safe-bg: #16321f;
    --warn: #fbbf24;
    --warn-bg: #3f2d0a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 20px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header h1 {
  font-size: 1.9rem;
  margin: 0 0 10px;
}

header p {
  color: var(--text-muted);
  margin: 0 0 24px;
  font-size: 1.02rem;
  line-height: 1.6;
  max-width: 90ch;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 20px 0 28px;
}

.metric-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}

.metric-card h3 {
  margin: 0 0 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.metric-card .stat-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  padding: 2px 0;
}

.metric-card .stat-row span:last-child {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 9px 16px;
  transition: background 0.15s, transform 0.05s;
}

button:hover { background: var(--surface-alt); }
button:active { transform: scale(0.98); }

button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 600;
}

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

.sample-tag {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.model-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  margin-left: auto;
}

.model-picker label {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text-muted);
}

.model-picker input { display: none; }

.model-picker input:checked + span {
  color: var(--text);
}

.model-picker label:has(input:checked) {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 14px 18px 18px;
  box-shadow: var(--shadow);
}

legend {
  padding: 0 6px;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px 16px;
}

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

.field-label-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.field label {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.info-btn {
  width: 16px;
  height: 16px;
  min-height: 0;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-muted);
  font-size: 0.66rem;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
}

.info-btn:hover, .info-btn:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.field-popover {
  position: absolute;
  z-index: 50;
  max-width: 280px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.8rem;
  line-height: 1.4;
  padding: 8px 12px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.field input, .field select {
  font: inherit;
  padding: 7px 9px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  width: 100%;
}

.field input:focus, .field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.predict-bar {
  margin: 28px 0;
  display: flex;
  justify-content: center;
}

.predict-bar button {
  padding: 13px 38px;
  font-size: 1rem;
  border-radius: 999px;
  box-shadow: 0 6px 24px rgba(79, 95, 224, 0.35);
}

.results {
  margin-top: 28px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.result-card h3 {
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.verdict {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.verdict.fraud { background: var(--danger-bg); color: var(--danger); }
.verdict.safe { background: var(--safe-bg); color: var(--safe); }
.verdict.warn { background: var(--warn-bg); color: var(--warn); }

.summary-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-width: 2px;
}

.summary-text {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.prob-bar-track {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: var(--surface-alt);
  overflow: hidden;
  margin: 8px 0 4px;
}

.prob-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--safe), var(--danger));
}

.prob-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.truth-note {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

footer {
  margin-top: 48px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

footer a { color: var(--accent); }

.hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: -8px;
  margin-bottom: 12px;
}

.hint-inline {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: normal;
}

details#advanced-details {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 4px 18px;
}

details#advanced-details summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}

details#advanced-details summary::-webkit-details-marker { display: none; }

details#advanced-details summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--text-muted);
  transition: transform 0.15s;
}

details#advanced-details[open] summary::before {
  transform: rotate(90deg);
}

details#advanced-details fieldset {
  box-shadow: none;
  margin: 0 0 14px;
}

details#advanced-details > div {
  padding-bottom: 12px;
}

/* Touch targets and layout for small screens. */
@media (max-width: 640px) {
  .wrap {
    padding: 20px 14px 100px;
  }

  header h1 {
    font-size: 1.35rem;
  }

  header p {
    font-size: 0.92rem;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar button {
    width: 100%;
  }

  .model-picker {
    width: 100%;
    margin-left: 0;
    justify-content: center;
  }

  .model-picker label {
    flex: 1;
    text-align: center;
  }

  fieldset {
    padding: 12px 14px 16px;
  }

  .field-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px 12px;
  }

  button {
    min-height: 44px;
  }

  .field input, .field select {
    min-height: 40px;
    font-size: 16px; /* prevents iOS Safari from auto-zooming on focus */
  }

  .predict-bar button {
    width: 100%;
    padding: 13px 20px;
  }

  .results {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .field-grid {
    grid-template-columns: 1fr;
  }
}