:root {
  --bg: #0e1217;
  --card: #161b22;
  --border: #232a33;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;

  --high: #2da44e;
  --medium: #d4a017;
  --low: #db6d28;
  --none: #cf222e;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 32px 16px 64px;
  min-height: 100vh;
}

main {
  max-width: 720px;
  margin: 0 auto;
}

header {
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.5px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

h2 {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}

.card.hidden { display: none; }

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

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}

label em {
  font-style: normal;
  font-size: 11px;
  opacity: 0.7;
  margin-left: 4px;
}

label span { display: block; }

input, select {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 10px;
  font-size: 14px;
  font-family: inherit;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 20px;
}

button {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: #0d1117;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  cursor: pointer;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button:disabled {
  opacity: 0.5;
  cursor: wait;
}

.result-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: #0d1117;
  border-radius: 8px;
  margin-bottom: 12px;
}

.confidence-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.confidence-HIGH   { background: rgba(45,164,78,0.18);  color: var(--high); }
.confidence-MEDIUM { background: rgba(212,160,23,0.18); color: var(--medium); }
.confidence-LOW    { background: rgba(219,109,40,0.18); color: var(--low); }
.confidence-NONE   { background: rgba(207,34,46,0.18);  color: var(--none); }

.unit {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -1px;
}

.meta {
  flex: 1;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.meta strong { color: var(--text); font-weight: 600; }

.reasons {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  color: var(--muted);
}
.reasons li { margin: 2px 0; }
.reasons li::before { content: "→ "; color: var(--accent); }

.candidates h3 {
  margin: 16px 0 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.alt {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: #0d1117;
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 13px;
}

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

pre {
  background: #0d1117;
  border-radius: 6px;
  padding: 12px;
  font-size: 12px;
  overflow-x: auto;
  margin: 8px 0 0;
  color: var(--muted);
}

details summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
}

.preset-menu {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.preset-menu.hidden { display: none; }

.preset-menu button {
  background: transparent;
  color: var(--text);
  text-align: left;
  font-size: 13px;
  font-weight: 400;
  padding: 6px 10px;
}
.preset-menu button:hover { background: #1f2630; }

.error {
  padding: 12px;
  background: rgba(207,34,46,0.12);
  border: 1px solid rgba(207,34,46,0.3);
  border-radius: 6px;
  color: var(--none);
  font-size: 13px;
}

@media (max-width: 540px) {
  .grid { grid-template-columns: 1fr; }
}