:root {
  --bg: #faf6ef;
  --card: #ffffff;
  --text: #2b2118;
  --muted: #8a7a68;
  --accent: #d1495b;
  --accent-soft: #fbe9ec;
  --crust: #e8b268;
  --border: #eadfce;
  --warning-bg: #fff4d6;
  --warning-border: #e8c96a;
  --shadow: 0 1px 3px rgba(60, 40, 20, 0.08);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --card: #292420;
    --text: #f2ece3;
    --muted: #a89a88;
    --accent: #e5697a;
    --accent-soft: #3d2a2e;
    --crust: #c99a55;
    --border: #3a332c;
    --warning-bg: #3a3120;
    --warning-border: #8a763a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 14px 32px;
}

.app-header {
  text-align: center;
  padding: 20px 16px 6px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.45rem;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  margin: 12px 0;
  box-shadow: var(--shadow);
}

.section-title {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

details > summary.section-title {
  margin-bottom: 0;
  cursor: pointer;
}

/* ---- Inputs ---- */

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

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  -moz-appearance: textfield;
  appearance: textfield;
  text-align: center;
}

input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

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

.stepper {
  display: flex;
  gap: 6px;
  align-items: stretch;
}

.stepper input { flex: 1; min-width: 0; }

.step-btn {
  flex: 0 0 42px;
  font-size: 1.2rem;
  font-weight: 700;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--accent);
  border-radius: 10px;
  cursor: pointer;
  touch-action: manipulation;
}

.step-btn:active { background: var(--accent-soft); }

.hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.link-btn {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  font-size: inherit;
  cursor: pointer;
  text-decoration: underline;
}

.advanced { margin-top: 14px; }

.advanced summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.advanced .field-grid { margin-top: 12px; }

/* ---- Tabs ---- */

.tabs {
  display: flex;
  gap: 6px;
  margin: 14px 0 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  position: sticky;
  top: max(env(safe-area-inset-top), 6px);
  z-index: 10;
  box-shadow: var(--shadow);
}

.tab {
  flex: 1;
  padding: 10px 4px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  touch-action: manipulation;
}

.tab.active {
  background: var(--accent);
  color: #fff;
}

/* ---- Results ---- */

.warnings { margin: 12px 0 0; }

.warning {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.88rem;
  margin: 8px 0;
}

table.ingredients {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

table.ingredients td {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

table.ingredients tr:last-child td { border-bottom: none; }

table.ingredients td.amount {
  text-align: right;
  font-weight: 700;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

table.ingredients tr.sub td {
  font-size: 0.85rem;
  color: var(--muted);
  padding-left: 8px;
}

table.ingredients tr.sub td.amount { font-weight: 600; }

.pct {
  display: inline-block;
  margin-left: 6px;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 7px;
  white-space: nowrap;
}

.slurry {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 10px 12px;
  margin-top: 10px;
}

/* ---- Temperatures ---- */

.temp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.temp-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}

.temp-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.temp-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

/* ---- Timeline ---- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.timeline li {
  position: relative;
  padding: 0 0 16px 40px;
  counter-increment: step;
}

.timeline li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 30px;
  bottom: 2px;
  width: 2px;
  background: var(--border);
}

.timeline h3 {
  margin: 2px 0 4px;
  font-size: 0.95rem;
}

.timeline p {
  margin: 4px 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- Diagnostics ---- */

.diag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 12px;
}

.diag-grid h3 {
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.diag-grid h4 {
  margin: 10px 0 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

.diag-grid ul {
  margin: 0;
  padding-left: 18px;
  font-size: 0.82rem;
  color: var(--muted);
}

.diag-grid li { margin: 2px 0; }

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 20px;
}

@media (max-width: 420px) {
  .diag-grid { grid-template-columns: 1fr; }
}