/* Periodic table lab — scoped; uses topic.css variables */

.periodic-lab {
  --pt-accent: var(--chip-chemistry);
  --pt-muted: var(--color-text-muted);
  --pt-glow: oklch(from var(--chip-chemistry) l c h / 0.35);
  max-width: 980px;
  font-family: var(--font-body);
}

/* ── Header ──────────────────────────────────────────────── */
.periodic-lab__header { margin-bottom: var(--space-6); }
.periodic-lab__eyebrow {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--pt-accent); margin-bottom: var(--space-2);
}
.periodic-lab__title {
  font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700;
  letter-spacing: -0.02em; line-height: 1.25; margin-bottom: var(--space-3);
}
.periodic-lab__intro {
  font-size: var(--text-sm); color: var(--pt-muted); line-height: 1.65; max-width: 56ch;
}

/* ── Tabs ────────────────────────────────────────────────── */
.periodic-lab__tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-6); }
.periodic-lab__tab {
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 600;
  padding: 0.5rem 1rem; border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--pt-muted); cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive),
              border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.periodic-lab__tab:hover { color: var(--color-text); border-color: oklch(from var(--pt-accent) l c h / 0.45); }
.periodic-lab__tab[aria-selected="true"] {
  color: var(--color-bg); background: var(--pt-accent);
  border-color: var(--pt-accent); box-shadow: 0 0 22px var(--pt-glow);
}

/* ── Panels ──────────────────────────────────────────────── */
.periodic-lab__panel { display: none; animation: pt-lab-in 0.42s cubic-bezier(0.16,1,0.3,1) both; }
.periodic-lab__panel.is-active { display: block; }
@keyframes pt-lab-in { from { opacity:0; transform:translateY(6px); } to { opacity:1; transform:translateY(0); } }
@media (prefers-reduced-motion:reduce) { .periodic-lab__panel { animation:none; } }

.periodic-lab__section-label {
  font-size: var(--text-xs); font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--color-text-faint); margin-bottom: var(--space-4);
}

/* ── Periodic table grid ─────────────────────────────────── */
.periodic-lab__grid-wrap {
  border-radius: var(--radius-xl); border: 1px solid var(--color-border);
  background: var(--color-surface); padding: var(--space-4);
  margin-bottom: var(--space-5); overflow-x: auto;
}
.periodic-lab__grid {
  display: grid;
  grid-template-columns: repeat(18, minmax(28px, 1fr));
  grid-template-rows: repeat(4, 1fr);
  gap: 3px; min-width: 540px;
}
.periodic-lab__cell {
  aspect-ratio: 1; min-height: 34px; border-radius: 5px;
  border: 1px solid transparent; padding: 2px;
  font-family: var(--font-mono); font-size: clamp(0.6rem,1.6vw,0.75rem); font-weight: 600;
  cursor: pointer; color: var(--color-text);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0;
  transition: transform 0.12s ease, box-shadow var(--transition-interactive),
              opacity var(--transition-interactive), background var(--transition-interactive);
}
.periodic-lab__cell:hover:not(:disabled) { transform: scale(1.08); z-index: 2; box-shadow: 0 4px 14px oklch(from var(--color-text) l c h / 0.12); }
.periodic-lab__cell-sym { font-size: inherit; line-height: 1.2; }
.periodic-lab__cell-z { font-size: 0.55em; opacity: 0.5; line-height: 1; }

/* Family colours */
.periodic-lab__cell--alkali     { background: oklch(from #e07070 l c h / 0.35); border-color: oklch(from #e07070 l c h / 0.5); }
.periodic-lab__cell--alkaline   { background: oklch(from #e8a83a l c h / 0.32); border-color: oklch(from #e8a83a l c h / 0.45); }
.periodic-lab__cell--transition { background: oklch(from #d4a574 l c h / 0.30); border-color: oklch(from #d4a574 l c h / 0.42); }
.periodic-lab__cell--metal      { background: oklch(from #c4b8a8 l c h / 0.40); border-color: oklch(from #c4b8a8 l c h / 0.55); }
.periodic-lab__cell--metalloid  { background: oklch(from #9b7ed4 l c h / 0.28); border-color: oklch(from #9b7ed4 l c h / 0.42); }
.periodic-lab__cell--nonmetal   { background: oklch(from #7ab894 l c h / 0.28); border-color: oklch(from #7ab894 l c h / 0.4); }
.periodic-lab__cell--halogen    { background: oklch(from #5ba8b0 l c h / 0.35); border-color: oklch(from #5ba8b0 l c h / 0.5); }
.periodic-lab__cell--noble      { background: oklch(from #7eb8d6 l c h / 0.3);  border-color: oklch(from #7eb8d6 l c h / 0.45); }

.periodic-lab__cell--gradient { border-color: rgba(132,155,177,0.15); }
.periodic-lab__cell--dim { opacity: 0.3; }
.periodic-lab__cell--hl-period { box-shadow: 0 0 0 2px #5ba8b0; opacity: 1 !important; }
.periodic-lab__cell--hl-group  { box-shadow: 0 0 0 2px var(--pt-accent); opacity: 1 !important; }
.periodic-lab__cell--pick      { box-shadow: 0 0 0 3px var(--color-text); opacity: 1 !important; }

/* ── Overlay bar ─────────────────────────────────────────── */
.periodic-lab__overlay-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.periodic-lab__overlay-label {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--pt-muted);
}
.periodic-lab__overlay-btn {
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 600;
  padding: 0.35rem 0.85rem; border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--pt-muted); cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive);
}
.periodic-lab__overlay-btn:hover { border-color: oklch(from var(--pt-accent) l c h / 0.4); color: var(--color-text); }
.periodic-lab__overlay-btn--active {
  background: var(--pt-accent); border-color: var(--pt-accent); color: var(--color-bg);
}

/* ── Detail panel ────────────────────────────────────────── */
.periodic-lab__detail {
  border-radius: var(--radius-md); border: 1px solid var(--color-border);
  padding: var(--space-5); background: oklch(from var(--pt-accent) l c h / 0.05);
  min-height: 6rem; margin-bottom: var(--space-5);
}
.periodic-lab__detail h3 { font-family: var(--font-display); font-size: var(--text-base); margin-bottom: var(--space-2); }
.periodic-lab__detail p { font-size: var(--text-sm); color: var(--pt-muted); line-height: 1.6; }
.periodic-lab__detail p strong { color: var(--color-text); }
.periodic-lab__z { font-family: var(--font-mono); color: var(--pt-accent); font-weight: 600; }

/* ── Mini grid (trend predictor) ─────────────────────────── */
.periodic-lab__trend-mini { margin-bottom: var(--space-4); }
.periodic-lab__mini-grid {
  display: grid; grid-template-columns: repeat(18, 1fr); grid-template-rows: repeat(4, 1fr);
  gap: 2px; max-width: 340px; margin: 0 auto;
}
.periodic-lab__mini-cell {
  aspect-ratio: 1; min-height: 10px; border-radius: 2px;
  background: oklch(from var(--color-text) l c h / 0.08);
  font-size: 0.5rem; font-family: var(--font-mono); font-weight: 700;
  display: flex; align-items: center; justify-content: center; color: transparent;
}
.periodic-lab__mini-cell--hl {
  background: var(--pt-accent); color: var(--color-bg);
}

/* ── Trend predictor ─────────────────────────────────────── */
.periodic-lab__trend-q {
  font-size: var(--text-base); margin-bottom: var(--space-4); max-width: 44ch;
}
.periodic-lab__trend-q strong { color: var(--pt-accent); }
.periodic-lab__trend-pair { display: flex; gap: var(--space-3); margin-bottom: var(--space-5); flex-wrap: wrap; }
.periodic-lab__trend-btn {
  font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 700;
  padding: var(--space-4) var(--space-6); border-radius: var(--radius-md);
  border: 2px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text); cursor: pointer; min-width: 80px; text-align: center;
  transition: border-color var(--transition-interactive), background var(--transition-interactive), transform 0.1s ease;
}
.periodic-lab__trend-btn:hover:not(:disabled) { border-color: oklch(from var(--pt-accent) l c h / 0.6); transform: scale(1.03); }
.periodic-lab__trend-btn:disabled { cursor: default; }
.periodic-lab__trend-btn--correct { border-color: var(--chip-biology); background: oklch(from var(--chip-biology) l c h / 0.12); }
.periodic-lab__trend-btn--wrong   { border-color: #c45c5c; background: oklch(from #c45c5c l c h / 0.1); }

/* Trend bars (animated reveal) */
.periodic-lab__trend-bars { margin-bottom: var(--space-4); }
.periodic-lab__trend-bar-row { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-2); }
.periodic-lab__trend-bar-label { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 600; min-width: 2.5ch; }
.periodic-lab__trend-bar-track {
  flex: 1; height: 18px; border-radius: 4px; background: oklch(from var(--color-text) l c h / 0.06);
  overflow: hidden;
}
.periodic-lab__trend-bar-fill {
  height: 100%; border-radius: 4px;
  background: linear-gradient(90deg, var(--pt-accent), oklch(from var(--pt-accent) l c h / 0.6));
  transition: width 0.65s cubic-bezier(0.16,1,0.3,1);
}
.periodic-lab__trend-bar-val { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--pt-muted); min-width: 5ch; }
.periodic-lab__trend-score { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--pt-muted); margin-bottom: var(--space-4); }
.periodic-lab__trend-score strong { color: var(--pt-accent); font-size: var(--text-base); }

/* ── Element hunt ────────────────────────────────────────── */
.periodic-lab__hunt-top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: var(--space-4); margin-bottom: var(--space-4);
}
.periodic-lab__hunt-prompt { font-size: var(--text-base); max-width: 36ch; font-weight: 500; }
.periodic-lab__hunt-stats { display: flex; align-items: center; gap: var(--space-4); }
.periodic-lab__hunt-score {
  font-family: var(--font-mono); font-size: var(--text-sm); color: var(--pt-muted);
}
.periodic-lab__hunt-score strong { color: var(--pt-accent); font-size: var(--text-lg); }
.periodic-lab__hunt-timer {
  font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 700;
  padding: 0.3rem 0.8rem; border-radius: var(--radius-md);
  background: oklch(from var(--color-text) l c h / 0.06);
  border: 1px solid var(--color-border); min-width: 2.2ch; text-align: center;
}
.periodic-lab__hunt-timer--warn { color: #e07070; border-color: oklch(from #e07070 l c h / 0.4); }

/* ── Ion charge predictor ────────────────────────────────── */
.periodic-lab__ion-card {
  border-radius: var(--radius-xl); border: 1px solid var(--color-border);
  background: var(--color-surface); padding: var(--space-6); max-width: 540px;
}
.periodic-lab__ion-info {
  font-size: var(--text-base); line-height: 1.55; margin-bottom: var(--space-5);
}
.periodic-lab__ion-info strong { color: var(--pt-accent); font-size: var(--text-lg); }
.periodic-lab__ion-btns {
  display: flex; flex-wrap: wrap; gap: var(--space-2); justify-content: center; margin-bottom: var(--space-4);
}
.periodic-lab__charge-btn {
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 600;
  padding: 0.6rem 1.1rem; border-radius: var(--radius-md);
  border: 1px solid var(--color-border); background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--color-text); cursor: pointer; min-width: 3.5ch; text-align: center;
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}
.periodic-lab__charge-btn:hover:not(:disabled) {
  border-color: oklch(from var(--pt-accent) l c h / 0.5);
  background: oklch(from var(--pt-accent) l c h / 0.08);
}
.periodic-lab__charge-btn:disabled { cursor: default; opacity: 0.85; }
.periodic-lab__charge-btn--correct { border-color: var(--chip-biology); background: oklch(from var(--chip-biology) l c h / 0.12); }
.periodic-lab__charge-btn--wrong   { border-color: #c45c5c; background: oklch(from #c45c5c l c h / 0.1); }

/* ── Shared: buttons, feedback, btn row ──────────────────── */
.periodic-lab__btn {
  font-family: var(--font-body); font-weight: 600; font-size: var(--text-sm);
  padding: 0.65rem 1.25rem; border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-text) l c h / 0.06);
  color: var(--color-text); cursor: pointer;
  transition: background var(--transition-interactive), border-color var(--transition-interactive), transform 0.12s ease;
}
.periodic-lab__btn:hover { background: oklch(from var(--pt-accent) l c h / 0.15); border-color: oklch(from var(--pt-accent) l c h / 0.4); }
.periodic-lab__btn:active { transform: scale(0.97); }
.periodic-lab__btn--primary { background: var(--pt-accent); border-color: var(--pt-accent); color: var(--color-bg); }
.periodic-lab__btn--primary:hover { filter: brightness(1.06); }
.periodic-lab__btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-4); }

.periodic-lab__feedback { margin-top: var(--space-4); font-size: var(--text-sm); line-height: 1.55; font-weight: 600; }
.periodic-lab__feedback--ok { color: var(--chip-biology); }
.periodic-lab__feedback--no { color: #e07070; }