/* ── Design tokens ── */
:root {
  --bg: #f0f2f5;
  --card: #ffffff;
  --card-border: #e2e4e9;
  --text: #1a1c21;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-muted: rgba(37, 99, 235, 0.12);
  --danger: #dc2626;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.06);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { min-height: 100%; background: var(--bg); }

body {
  min-height: 100vh;
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

button, input, select { font: inherit; }

/* ── Shell ── */
.app-shell {
  width: min(1080px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 48px;
  display: grid;
  gap: 16px;
}

/* ── Card ── */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  transition: box-shadow .2s ease;
}
.card:focus-within { box-shadow: var(--shadow-md); }

/* ── Topbar ── */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 4px 2px 8px;
}

h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1;
}

h2.section-title {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.82rem;
}
.status-pill--loading { background: #f1f5f9; color: var(--muted); }
.status-pill--ready   { background: #dcfce7; color: #166534; }
.status-pill--error   { background: #fee2e2; color: #991b1b; }

.meta-line { color: var(--muted); font-size: 0.85rem; }

/* ── Material row ── */
.material-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ── Label / Input / Select ── */
label {
  display: grid;
  gap: 6px;
}
label span {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.02em;
}

input, select {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--card-border);
  background: #f8fafc;
  color: var(--text);
  transition: border-color .15s ease, background .15s ease;
  appearance: auto;
}
input:hover, select:hover {
  border-color: #b0b8c8;
  background: #fff;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 3px var(--accent-muted);
}
select:disabled { opacity: 0.5; cursor: not-allowed; background: #f1f5f9; }

/* ── tfoot add-row ── */
.data-table tfoot tr.add-row {
  background: #f8fafc;
  border-top: 2px dashed var(--card-border);
}
.data-table tfoot tr.add-row td {
  padding: 8px 10px;
  border-bottom: none;
}
.data-table tfoot tr.add-row:hover { background: #f0f6ff; }

.inline-select {
  width: 100%;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--card-border);
  background: #fff;
  color: var(--text);
  font-size: 0.85rem;
  transition: border-color .15s, box-shadow .15s;
}
.inline-select:hover { border-color: #b0b8c8; }
.inline-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}
.inline-select:disabled { opacity: 0.45; background: #f1f5f9; cursor: not-allowed; }

.add-row-preview {
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 500;
}

.add-icon-cell { width: 44px; text-align: center; }

/* + button */
.add-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  transition: background .15s, color .15s, transform .12s, box-shadow .15s;
  padding: 0;
}
.add-btn svg { width: 14px; height: 14px; }
.add-btn:hover:not(:disabled) {
  background: var(--accent);
  color: #fff;
  transform: scale(1.12);
  box-shadow: 0 4px 12px rgba(37,99,235,.35);
}
.add-btn:disabled { opacity: 0.35; cursor: not-allowed; border-color: var(--muted); color: var(--muted); }

/* clear (✕) button in add-row */
.clear-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  transition: color .15s, background .15s;
}
.clear-btn:hover { color: var(--danger); background: #fee2e2; }

/* ── Buttons ── */
/* ── − Remove button ── */
.remove-cell { width: 44px; text-align: center; }

.remove-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 1.5px solid transparent;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  opacity: 0;
  transition: opacity .15s, background .15s, color .15s, border-color .15s, transform .12s;
}
.remove-btn svg { width: 13px; height: 13px; }

/* Show the − button when the row is hovered */
.data-table tbody tr:hover .remove-btn {
  opacity: 1;
}
.remove-btn:hover {
  background: #fee2e2;
  color: var(--danger);
  border-color: #fca5a5;
  transform: scale(1.12);
  opacity: 1;
}

/* ── Shared button base ── */
.primary-button, .secondary-button {
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: background .15s ease, transform .12s ease, box-shadow .15s ease;
}

.primary-button {
  background: var(--accent);
  color: #fff;
  padding: 11px 28px;
}
.primary-button:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,.35);
}
.primary-button:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Calculate footer (inside Components card) ── */
.components-footer {
  display: flex;
  justify-content: flex-end;
  padding-top: 14px;
  border-top: 1px solid var(--card-border);
  margin-top: 14px;
}

.calculate-btn {
  min-width: 160px;
  font-size: 1rem;
  padding: 13px 36px;
  border-radius: var(--radius-md);
}

/* ── Table ── */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--card-border); }

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.data-table thead tr {
  background: #f8fafc;
  border-bottom: 2px solid var(--card-border);
}

.data-table th {
  padding: 10px 14px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  white-space: nowrap;
}

.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
  font-size: 0.9rem;
}
.data-table tbody tr:last-child td { border-bottom: none; }

.data-table tbody tr { transition: background .1s ease; }
.data-table tbody tr:not(.empty-row):hover { background: #f8fafc; }

.empty-row td {
  color: var(--muted);
  text-align: center;
  padding: 28px 14px;
  font-size: 0.9rem;
}

@keyframes row-flash {
  0%, 100% { background: transparent; }
  40%       { background: #fef9c3; }
}
.row-highlight { animation: row-flash 1.2s ease; }

.row-num-cell { color: var(--muted); font-size: 0.82rem; width: 36px; }

.qty-input {
  width: 80px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--card-border);
  text-align: center;
  background: #f8fafc;
}
.qty-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
  background: #fff;
}

/* ── Results ── */
.result-summary {
  margin-bottom: 16px;
  font-size: 0.92rem;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.result-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  padding: 16px;
  background: #f8fafc;
}
.result-card h3 { font-size: 0.95rem; margin-bottom: 4px; }
.result-meta {
  background: #fff;
  border: 1px solid var(--card-border);
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  margin-bottom: 16px;
  display: inline-block;
}
.result-meta strong { color: var(--text); }

.pattern-list { list-style: none; display: grid; gap: 16px; padding: 0; }
.pattern-group {
  padding: 16px;
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  display: grid;
  gap: 12px;
}
.pattern-header { display: flex; justify-content: space-between; align-items: center; }
.pattern-header strong { font-size: 1rem; color: var(--accent); }
.pattern-qty { font-weight: 700; color: var(--text); background: var(--accent-muted); padding: 2px 8px; border-radius: 6px; font-size: 0.85rem; }

.pattern-sublist { list-style: none; padding: 0; display: grid; gap: 6px; }
.pattern-sublist li {
  padding-left: 14px;
  position: relative;
  font-size: 0.9rem;
}
.pattern-sublist li::before {
  content: "·";
  position: absolute;
  left: 0;
  font-weight: 900;
  color: var(--accent);
}

.pattern-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px dashed var(--card-border);
  font-size: 0.82rem;
}
.waste-tag { color: var(--danger); font-weight: 600; }
.usage-tag { color: var(--muted); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .material-row { grid-template-columns: 1fr; }
  .picker-row { grid-template-columns: 1fr 1fr; }
  .picker-row .reset-btn { grid-column: 1 / -1; justify-self: start; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 8px; }
  .hero-meta { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .picker-row { grid-template-columns: 1fr; }
}