:root {
  --bg: #f4f3ef;
  --card-bg: #ffffff;
  --text: #14171a;
  --text-dim: #5b6470;
  --accent: #1a56db;
  --border: #dcdde0;
  --error: #b3261e;
  --error-bg: #fceceb;
  --total-bg: #efe9d8;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 32px 16px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
}

.card {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
}

h1 {
  margin: 0 0 12px;
  font-size: 28px;
}

.instructions {
  margin: 0 0 24px;
  color: var(--text-dim);
  max-width: 65ch;
  line-height: 1.5;
}

form label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.input-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

#release-input {
  flex: 1 1 320px;
  min-width: 0;
  font-family: var(--mono);
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
}

#release-input.invalid {
  border-color: var(--error);
  background: var(--error-bg);
}

#release-input:focus,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
}

#calculate-btn {
  background: #14171a;
  color: #fff;
}

#calculate-btn:disabled {
  background: #c7c9cc;
  color: #6b6f73;
  cursor: not-allowed;
}

#clear-btn {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
}

#clear-btn:disabled {
  color: #a8adb3;
  cursor: not-allowed;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.error-banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--error-bg);
  border: 1px solid var(--error);
  color: var(--error);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 14px;
}

.error-banner[hidden] {
  display: none;
}

.error-icon {
  font-size: 16px;
  line-height: 1;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 640px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

.results-col h2 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 0 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.metadata-list {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
  row-gap: 10px;
}

.metadata-list dt {
  color: var(--text-dim);
  font-size: 13px;
  white-space: nowrap;
}

.metadata-list dd {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
}

.calc-breakdown {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calc-group {
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.calc-group-header {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 13px;
}

.calc-subrow {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
  padding: 4px 0 0 12px;
}

.calc-subrow .calc-value {
  font-family: var(--mono);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.calc-group-header .calc-value {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.grand-total {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--total-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
}

.grand-total-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.grand-total-value {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 20px;
}

.build-info {
  position: absolute;
  left: 16px;
  bottom: 12px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  opacity: 0.7;
}

.build-info[hidden] {
  display: none;
}