/* Practice lab extends DESIGN.md: Train's periwinkle, existing tokens and
   reading face, grey option rows, ink for the next action. */
.lab-page { display: flex; flex-direction: column; gap: var(--space-6); min-width: 0; }
.lab-entry, .lab-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 16px; padding: 20px; border-radius: 24px; background: var(--surface); color: var(--foreground); text-decoration: none; transition: background-color 180ms, transform 140ms; }
.lab-entry { border: 1px solid var(--border); }
.lab-entry > span:nth-child(2), .lab-row-copy { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.lab-entry strong, .lab-row strong { font-size: 1rem; font-weight: 700; letter-spacing: -0.025em; }
.lab-entry span > span, .lab-row-copy > span { color: var(--muted-foreground); font-size: 0.86rem; line-height: 1.55; }
.lab-row-arrow { width: 20px; height: 20px; }
.lab-entry:hover, .lab-row:hover { background: var(--surface-muted); transform: translateY(-1px); }
.lab-entry:active, .lab-row:active { transform: translateY(1px); }
.lab-feature { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; padding: clamp(24px, 5vw, 36px); border-radius: var(--radius-card); background: var(--ink); color: var(--on-ink); }
.lab-feature h2 { color: var(--on-ink); font-size: clamp(1.8rem, 5vw, 2.3rem); line-height: 1.12; letter-spacing: -0.045em; max-width: 14ch; text-wrap: balance; }
.lab-feature .eyebrow, .lab-feature > p:not(.eyebrow) { color: var(--on-ink-muted); }
.lab-feature .form-actions { align-self: stretch; align-items: flex-start; margin-top: 4px; }
.lab-route { list-style: none; display: flex; flex-wrap: wrap; gap: 12px; padding: 0; counter-reset: lab-route; font-size: 0.8rem; }
.lab-route li { display: flex; align-items: center; gap: 6px; counter-increment: lab-route; }
.lab-route li::before { content: counter(lab-route); display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--periwinkle); color: var(--on-pastel); font-weight: 800; }
.lab-more, .lab-game-list { display: flex; flex-direction: column; gap: 14px; }
.lab-more > h2 { font-size: 1.13rem; }
.lab-dose { font-size: 0.75rem; font-weight: 600; color: var(--muted-foreground); }
.lab-about, .lab-notebook, .lab-ready { padding: 24px; border-radius: var(--radius-card); background: var(--surface); }
.lab-about h2, .lab-notebook h2, .lab-ready h2 { font-size: 1.15rem; line-height: 1.3; letter-spacing: -0.03em; }
.lab-about > p, .lab-notebook > p { font-size: 0.88rem; line-height: 1.65; }
.lab-evidence { font-size: 0.86rem; }
.lab-evidence > p, .lab-evidence > a { margin-top: 12px; display: block; }
.lab-evidence > a { color: var(--foreground); text-underline-offset: 3px; overflow-wrap: anywhere; }
.lab-notebook-row { display: flex; flex-direction: column; gap: 5px; border-top: 1px solid var(--border); padding-block: 12px; font-size: 0.86rem; overflow-wrap: anywhere; }
.lab-notebook-row > span { color: var(--muted-foreground); }
.lab-detail-head { align-items: flex-start; text-align: left; }
.lab-detail-head .lead { max-width: 46ch; }
.lab-preview { background: var(--periwinkle); color: var(--on-pastel); border-radius: var(--radius-card); padding: clamp(24px, 5vw, 36px); }
.lab-preview-content { display: flex; flex-direction: column; gap: 16px; min-height: 175px; justify-content: center; }
.lab-preview .eyebrow, .lab-preview-caption { color: var(--on-pastel-muted); font-size: 0.8rem; }
.lab-preview-reading { font: 500 1.4rem/1.6 var(--read-font, var(--font-read)); max-width: 32ch; text-wrap: pretty; }
.lab-preview-word { font: 700 clamp(1.7rem, 7vw, 2.5rem)/1.2 var(--read-font, var(--font-read)); letter-spacing: -0.03em; overflow-wrap: anywhere; }
.lab-preview-shapes { font-size: 3rem; letter-spacing: 0.1em; }
.lab-preview-fading { color: var(--on-pastel-muted); }
.lab-steps { list-style: none; display: flex; flex-direction: column; gap: 24px; padding: 0; }
.lab-step { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 14px; align-items: start; }
.lab-step .intro-step-number { position: static; width: 30px; height: 30px; margin: 0; }
.lab-step h2 { font-size: 1rem; margin-bottom: 5px; }
.lab-step p { color: var(--muted-foreground); font-size: 0.88rem; line-height: 1.6; }
.lab-option-fields { display: flex; flex-direction: column; gap: 18px; }
.lab-ready .button { font-size: 0.93rem; padding-inline: 16px; }
.lab-hud { flex-wrap: wrap; gap: 10px; }
.lab-hud .eyebrow { flex: 1; min-width: 90px; text-align: center; font-size: 0.76rem; }
.lab-session-head { display: flex; flex-direction: column; gap: 6px; }
.lab-session-head h1 { font-size: clamp(1.4rem, 5vw, 1.8rem); }
.lab-task { display: flex; flex-direction: column; align-items: stretch; gap: 24px; min-width: 0; }
.lab-task > h2 { font-size: clamp(1.3rem, 4.6vw, 1.7rem); line-height: 1.3; text-wrap: balance; }
.lab-task > .button { align-self: flex-start; }
.lab-reading { margin: 0; padding: clamp(22px, 5vw, 36px); background: var(--surface); border-radius: var(--radius-card); width: 100%; max-width: 100%; font: 400 var(--read-size, 1.18rem)/var(--read-leading, 1.7) var(--read-font, var(--font-read)); letter-spacing: var(--read-tracking, normal); white-space: pre-wrap; overflow-wrap: anywhere; }
.lab-answer-form { display: flex; flex-direction: column; align-items: stretch; gap: 14px; }
.lab-answer-form textarea { min-height: 130px; resize: vertical; }
.lab-answer-form .button { align-self: flex-start; }
.lab-choices { display: flex; flex-direction: column; gap: 12px; }
.lab-choices .button { justify-content: flex-start; padding: 18px 22px; border-radius: 20px; white-space: normal; text-align: left; line-height: 1.5; }
.lab-choices .button:disabled { opacity: 1; color: var(--muted-foreground); }
.lab-choices .button[data-answer="correct"] { background: var(--success-muted); color: var(--success); box-shadow: inset 0 0 0 2px var(--success); }
.lab-choices .button[data-answer="chosen"] { box-shadow: inset 0 0 0 2px var(--muted-foreground); }
.lab-feedback { display: flex; flex-direction: column; gap: 8px; padding: 22px; border-radius: 24px; background: var(--surface); font-size: 0.95rem; line-height: 1.65; }
.lab-feedback strong { font-size: 1rem; }
.lab-result-head { display: flex; flex-direction: column; gap: 12px; padding: clamp(24px, 5vw, 36px); border-radius: var(--radius-card); background: var(--ink); color: var(--on-ink); }
.lab-result-head .eyebrow { color: var(--on-ink-muted); }
.lab-result-head h1 { font-size: clamp(1.7rem, 6vw, 2.5rem); color: var(--on-ink); letter-spacing: -0.04em; }
.lab-result-actions { align-items: stretch; }
.lab-response-review > summary { cursor: pointer; font-weight: 600; padding-block: 10px; }
.lab-response-review .lab-notebook-row { white-space: pre-wrap; }
.lab-timed-surface { position: relative; }
.lab-timed-surface [data-faded="true"] { visibility: hidden; }
.lab-timed-surface[data-paused="true"] { color: transparent; }
.lab-timed-surface[data-paused="true"] > * { visibility: hidden; }
.lab-timed-surface[data-paused="true"]::after { content: 'Paused. Resume when you are ready.'; position: absolute; inset: 0; display: grid; place-items: center; padding: 20px; color: var(--foreground); background: var(--surface); border-radius: inherit; text-align: center; font: 600 1rem/1.5 var(--font-display); letter-spacing: normal; }
.lab-search-board { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; width: min(100%, 400px); align-self: center; padding: 12px; border-radius: var(--radius-card); background: var(--surface); }
.lab-search-cell, .lab-search-centre { display: grid; place-items: center; aspect-ratio: 1; min-width: 0; min-height: 60px; border: 0; border-radius: 20px; background: var(--surface-raised); color: var(--foreground); font: 600 clamp(1.8rem, 8vw, 3rem)/1 var(--font-display); touch-action: manipulation; }
.lab-search-cell { cursor: pointer; transition: background-color 180ms, transform 140ms; }
.lab-search-cell:disabled { cursor: default; opacity: 1; }
.lab-search-cell:not(:disabled):hover { background: var(--periwinkle); color: var(--on-pastel); }
.lab-search-cell:not(:disabled):active { transform: translateY(2px); }
.lab-search-centre { background: var(--periwinkle); color: var(--on-pastel); border-radius: 50%; }

@media (min-width: 960px) {
  .lab-page > .split { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
  .lab-page > .split > .split-side { align-self: start; position: sticky; top: 24px; }
}
@media (max-width: 359px) {
  .lab-entry, .lab-row { gap: 10px; padding: 16px; }
  .lab-entry .icon-tile, .lab-row .icon-tile { width: 36px; height: 36px; }
  .lab-ready { padding: 20px; }
  .lab-ready .button { padding-inline: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .lab-entry, .lab-row, .lab-search-cell { transition: none; }
}

.lab-notebook-link { color: var(--foreground); text-decoration: none; border-radius: 8px; padding-inline: 6px; }
.lab-notebook-link:hover { background: var(--surface-muted); }
.lab-science-list { display: flex; flex-direction: column; gap: 20px; margin-block: 20px; }
.lab-science-list h3 { font-size: 1rem; margin-bottom: 10px; }