/* Measure Lab — scoped under .measure-lab; uses topic.css variables */

.measure-lab {
  --lab-accent: var(--chip-foundation);
  --lab-accent-2: #8b8578;
  --lab-muted: var(--color-text-muted);
  --lab-correct: #4caf50;
  --lab-wrong: #e05555;
  max-width: 920px;
  font-family: var(--font-body);
}

/* ── header ────────────────────────────────────────────── */

.measure-lab__header { margin-bottom: var(--space-6); }

.measure-lab__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lab-accent);
  margin-bottom: var(--space-2);
}

.measure-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);
}

.measure-lab__intro {
  font-size: var(--text-sm);
  color: var(--lab-muted);
  line-height: 1.65;
  max-width: 62ch;
}

/* ── pill tabs with gradient ───────────────────────────── */

.measure-lab__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.measure-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(--lab-muted);
  cursor: pointer;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

.measure-lab__tab:hover {
  color: var(--color-text);
  border-color: oklch(from var(--lab-accent) l c h / 0.45);
}

.measure-lab__tab[aria-selected="true"] {
  color: var(--color-bg);
  background: linear-gradient(125deg, oklch(from var(--lab-accent) l c h / 0.92), var(--lab-accent-2));
  border-color: transparent;
  box-shadow: 0 0 18px oklch(from var(--lab-accent) l c h / 0.22);
}

.measure-lab__tab:focus-visible {
  outline: 2px solid var(--lab-accent);
  outline-offset: 2px;
}

/* ── panels & animation ────────────────────────────────── */

.measure-lab__panel {
  display: none;
  animation: measure-lab-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.measure-lab__panel.is-active { display: block; }

@keyframes measure-lab-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── section label ─────────────────────────────────────── */

.measure-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);
}

/* ── canvas stage wrap (radial gradient like atoms lab) ── */

.measure-lab__stage-wrap {
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background:
    radial-gradient(ellipse 80% 60% at 50% 45%, oklch(from var(--lab-accent) l c h / 0.07), transparent 55%),
    var(--color-surface);
  overflow: hidden;
  margin-bottom: var(--space-5);
}

.measure-lab__stage-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, transparent 40%, oklch(from var(--color-text) l c h / 0.03));
  border-radius: inherit;
}

/* ── canvas elements ───────────────────────────────────── */

.measure-lab__canvas {
  display: block;
  width: 100%;
  height: auto;
}

.measure-lab__canvas--ruler {
  aspect-ratio: 16 / 5;
  max-height: 220px;
}

.measure-lab__canvas--target {
  aspect-ratio: 4 / 3;
  max-height: 360px;
}

/* ── prompt box ────────────────────────────────────────── */

.measure-lab__prompt-box {
  position: relative;
  overflow: hidden;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.55;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: oklch(from var(--lab-accent-2) l c h / 0.06);
  margin-bottom: var(--space-4);
}

.measure-lab__prompt-box::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 42%,
    oklch(from var(--lab-accent) l c h / 0.1) 50%,
    transparent 58%
  );
  transform: translateX(-100%);
  animation: measure-shimmer 5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes measure-shimmer {
  0%, 70% { transform: translateX(-100%); }
  88%     { transform: translateX(100%); }
  100%    { transform: translateX(100%); }
}

/* ── MC choices (converter & general) ──────────────────── */

.measure-lab__choices {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.measure-lab__choice {
  font-size: var(--text-sm);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition:
    border-color var(--transition-interactive),
    background var(--transition-interactive),
    transform 0.1s ease;
}

.measure-lab__choice:hover:not(:disabled) {
  border-color: oklch(from var(--lab-accent) l c h / 0.55);
  background: oklch(from var(--lab-accent) l c h / 0.05);
}

.measure-lab__choice:active:not(:disabled) { transform: scale(0.99); }
.measure-lab__choice:disabled { cursor: default; opacity: 0.85; }

.measure-lab__choice--correct {
  border-color: var(--lab-correct);
  background: oklch(from var(--lab-correct) l c h / 0.1);
  animation: measure-choice-pop 0.45s cubic-bezier(0.34, 1.4, 0.64, 1);
}

.measure-lab__choice--wrong {
  border-color: var(--lab-wrong);
  background: oklch(from var(--lab-wrong) l c h / 0.08);
}

@keyframes measure-choice-pop {
  from { transform: scale(0.98); }
  55%  { transform: scale(1.015); }
  to   { transform: scale(1); }
}

/* ── feedback ──────────────────────────────────────────── */

.measure-lab__feedback {
  font-size: var(--text-sm);
  color: var(--lab-muted);
  line-height: 1.55;
  min-height: 2.5rem;
  margin-bottom: var(--space-3);
}

.measure-lab__feedback--ok { color: var(--lab-correct); font-weight: 600; }
.measure-lab__feedback--no { color: var(--lab-wrong); }

/* ── buttons ───────────────────────────────────────────── */

.measure-lab__btn {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition:
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    transform 0.1s ease;
}

.measure-lab__btn:hover {
  background: oklch(from var(--lab-accent) l c h / 0.12);
  border-color: oklch(from var(--lab-accent) l c h / 0.4);
}

.measure-lab__btn:active { transform: scale(0.97); }

.measure-lab__btn--primary {
  background: oklch(from var(--lab-accent) l c h / 0.18);
  border-color: var(--lab-accent);
  color: var(--color-text);
}

.measure-lab__btn--primary:hover {
  background: oklch(from var(--lab-accent) l c h / 0.28);
}

.measure-lab__btn:focus-visible {
  outline: 2px solid var(--lab-accent);
  outline-offset: 2px;
}

/* ── converter score ───────────────────────────────────── */

.measure-lab__cv-score {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--lab-muted);
  margin-bottom: var(--space-4);
}

.measure-lab__cv-score strong {
  color: var(--lab-accent);
  font-size: var(--text-base);
}

/* ── ruler panel ───────────────────────────────────────── */

.measure-lab__ruler-controls {
  padding: var(--space-4) 0;
}

.measure-lab__ruler-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.measure-lab__ruler-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--lab-muted);
}

.measure-lab__ruler-input {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 500;
  width: 7rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  text-align: center;
  transition:
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

.measure-lab__ruler-input:focus {
  border-color: var(--lab-accent);
  outline: none;
  box-shadow: 0 0 0 3px oklch(from var(--lab-accent) l c h / 0.15);
}

.measure-lab__ruler-input--correct {
  border-color: var(--lab-correct);
  box-shadow: 0 0 0 3px oklch(from var(--lab-correct) l c h / 0.18), 0 0 20px oklch(from var(--lab-correct) l c h / 0.15);
}

.measure-lab__ruler-input--wrong {
  border-color: var(--lab-wrong);
  animation: measure-shake 0.5s ease;
}

@keyframes measure-shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-5px); }
  40%      { transform: translateX(5px); }
  60%      { transform: translateX(-3px); }
  80%      { transform: translateX(3px); }
}

.measure-lab__ruler-unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--lab-muted);
}

.measure-lab__ruler-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--lab-muted);
}

.measure-lab__ruler-status strong {
  color: var(--lab-accent);
}

/* ── target (dartboard) panel ──────────────────────────── */

.measure-lab__target-controls {
  padding: var(--space-2) 0;
}

.measure-lab__target-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

@media (max-width: 480px) {
  .measure-lab__target-choices {
    grid-template-columns: 1fr;
  }
}

.measure-lab__target-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  text-align: center;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition:
    border-color var(--transition-interactive),
    background var(--transition-interactive),
    transform 0.1s ease;
}

.measure-lab__target-btn:hover:not(:disabled) {
  border-color: oklch(from var(--lab-accent) l c h / 0.5);
  background: oklch(from var(--lab-accent) l c h / 0.05);
}

.measure-lab__target-btn:active:not(:disabled) { transform: scale(0.98); }
.measure-lab__target-btn:disabled { cursor: default; opacity: 0.7; }

.measure-lab__target-btn--correct {
  border-color: var(--lab-correct);
  background: oklch(from var(--lab-correct) l c h / 0.12);
  opacity: 1 !important;
  animation: measure-choice-pop 0.45s cubic-bezier(0.34, 1.4, 0.64, 1);
}

.measure-lab__target-btn--wrong {
  border-color: var(--lab-wrong);
  background: oklch(from var(--lab-wrong) l c h / 0.08);
  opacity: 1 !important;
}

.measure-lab__target-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--lab-muted);
}

.measure-lab__target-status strong {
  color: var(--lab-accent);
}

/* ── fine print ────────────────────────────────────────── */

.measure-lab__fine {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-6);
  line-height: 1.5;
  max-width: 68ch;
}

/* ── reduced motion ────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .measure-lab__panel { animation: none; }
  .measure-lab__prompt-box::after { display: none; }
  .measure-lab__choice--correct { animation: none; }
  .measure-lab__target-btn--correct { animation: none; }
  .measure-lab__ruler-input--wrong { animation: none; }
}