:root {
  color-scheme: light dark;
  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --shadow: 0 1px 2px rgb(15 23 42 / 6%), 0 8px 24px rgb(15 23 42 / 6%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2e;
    --surface-2: #16213a;
    --border: #24314d;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #60a5fa;
    --accent-soft: #1e3a8a;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.25rem clamp(0.75rem, 3vw, 2rem) 3rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

.app-header {
  max-width: 1400px;
  margin: 0 auto 0.9rem;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 1.8rem);
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.settings {
  max-width: 1400px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.settings-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-right: 0.35rem;
}

.segment {
  position: relative;
  display: inline-flex;
}

.segment input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segment span {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

.segment input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.segment input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cards {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

.card-inputs {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  flex: 1 1 auto;
  min-width: 0;
}

.field-1rm {
  flex: 0 0 7.5rem;
}

.field-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.field input {
  width: 100%;
  padding: 0.55rem 0.65rem;
  font: inherit;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
}

.field input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.results {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9rem;
}

.tm-line {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.tm-line-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.tm-line b {
  font-size: 0.95rem;
}

.tm-line-pct {
  font-size: 0.75rem;
  color: var(--muted);
}

.warmup {
  margin-bottom: 0.85rem;
}

.warmup-title {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.3rem 0.5rem;
  font-size: 0.85rem;
}

.chip small {
  color: var(--muted);
  margin-left: 0.15rem;
}

.grid {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.grid th,
.grid td {
  text-align: left;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.grid thead th {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
}

.grid tbody th {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

.grid tbody tr:last-child th,
.grid tbody tr:last-child td {
  border-bottom: 0;
}

.weight {
  display: block;
  font-size: 1rem;
  font-weight: 600;
}

.weight .unit {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  margin-left: 0.15rem;
}

.meta {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}