/* Spectroscopy Lab — scoped; uses topic.css vars · accent: --chip-bridge */

.spectro-lab {
  --sp-accent: var(--chip-bridge);
  --sp-accent2: #5ba8b0;
  --sp-muted: var(--color-text-muted);
  --sp-ink: var(--color-text);
  --sp-uv: #9c7cff;
  --sp-ir: #ff6b6b;
  --sp-ok: var(--chip-biology);
  --sp-no: #e07070;
  --sp-glow: oklch(from var(--chip-bridge) l c h / 0.35);
  max-width: 920px;
  font-family: var(--font-body);
}

/* ── header ─────────────────────────────────────────────── */
.spectro-lab__header { margin-bottom: var(--space-6); }
.spectro-lab__eyebrow {
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--sp-accent); margin-bottom: var(--space-2);
}
.spectro-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);
}
.spectro-lab__intro {
  font-size: var(--text-sm); color: var(--sp-muted); line-height: 1.65; max-width: 62ch;
}

/* ── pill tabs ──────────────────────────────────────────── */
.spectro-lab__tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-6); }
.spectro-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(--sp-muted); cursor: pointer;
  transition: background var(--transition-interactive), color var(--transition-interactive),
              border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.spectro-lab__tab:hover { color: var(--sp-ink); border-color: oklch(from var(--sp-accent) l c h / 0.45); }
.spectro-lab__tab[aria-selected="true"] {
  color: var(--color-bg);
  background: linear-gradient(125deg, oklch(from var(--sp-accent) l c h / 0.88), var(--sp-accent2));
  border-color: transparent;
  box-shadow: 0 0 18px oklch(from var(--sp-accent) l c h / 0.2);
}
.spectro-lab__tab:focus-visible { outline: 2px solid var(--sp-accent); outline-offset: 2px; }

/* ── panels ─────────────────────────────────────────────── */
.spectro-lab__panel {
  display: none;
  animation: sp-lab-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.spectro-lab__panel.is-active { display: block; }
@keyframes sp-lab-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .spectro-lab__panel { animation: none; } }

.spectro-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 wraps ───────────────────────────────────────── */
.spectro-lab__canvas-wrap {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  margin-bottom: var(--space-5);
  background: radial-gradient(ellipse at 50% 60%, oklch(from var(--sp-accent) l c h / 0.1), transparent 70%), var(--color-surface);
  border: 1px solid var(--color-divider);
  box-shadow: 0 0 32px oklch(from var(--sp-accent) l c h / 0.08);
}
.spectro-lab__canvas-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;
}
.spectro-lab__canvas-wrap--dark {
  background: radial-gradient(ellipse at 50% 50%, rgba(80, 60, 160, 0.08), transparent 60%), #08080f;
}
.spectro-lab__canvas { display: block; width: 100%; height: auto; aspect-ratio: 16/10; max-height: 380px; }
.spectro-lab__canvas--spectrum { aspect-ratio: 16/7; max-height: 260px; }

/* ── controls / sliders ─────────────────────────────────── */
.spectro-lab__controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); margin: var(--space-4) 0;
}
.spectro-lab__slider-block { display: flex; flex-direction: column; gap: 0.25rem; flex: 1; min-width: 150px; }
.spectro-lab__slider-block label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--sp-muted); margin-bottom: var(--space-2);
}
.spectro-lab__slider-block label span {
  font-family: var(--font-mono); font-size: var(--text-sm); color: var(--sp-accent);
  letter-spacing: 0; text-transform: none;
}
.spectro-lab input[type="range"] { width: 100%; accent-color: var(--sp-accent); height: 6px; border-radius: 3px; }

/* ── buttons ────────────────────────────────────────────── */
.spectro-lab__btn {
  font-family: var(--font-body); font-weight: 600; font-size: var(--text-xs);
  padding: 0.5rem 1.1rem; border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--sp-ink); cursor: pointer;
  transition: transform 0.12s ease, background var(--transition-interactive), border-color var(--transition-interactive);
}
.spectro-lab__btn:hover { border-color: oklch(from var(--sp-accent) l c h / 0.5); }
.spectro-lab__btn:active { transform: scale(0.97); }
.spectro-lab__btn--primary {
  background: oklch(from var(--sp-accent) l c h / 0.18);
  border-color: var(--sp-accent); color: var(--sp-accent);
}
.spectro-lab__btn--primary:hover { filter: brightness(1.05); }
.spectro-lab__btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; margin-top: var(--space-4); }

/* ── readout / teach / fine ─────────────────────────────── */
.spectro-lab__readout {
  display: grid; gap: var(--space-3); padding: var(--space-5); border-radius: var(--radius-xl);
  background: oklch(from var(--sp-accent) l c h / 0.06);
  border: 1px solid oklch(from var(--sp-accent) l c h / 0.2);
  margin: var(--space-4) 0;
}
@media (min-width: 640px) { .spectro-lab__readout { grid-template-columns: repeat(3, 1fr); } }
.spectro-lab__stat { text-align: center; }
.spectro-lab__stat dt {
  font-size: var(--text-xs); font-weight: 600; color: var(--sp-muted);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-2);
}
.spectro-lab__stat dd { font-family: var(--font-mono); font-size: clamp(1rem, 2vw, 1.3rem); font-weight: 500; color: var(--sp-ink); }

.spectro-lab__teach {
  font-size: var(--text-sm); color: var(--sp-muted); line-height: 1.65;
  margin-top: var(--space-3); max-width: 58ch;
}
.spectro-lab__fine {
  font-size: var(--text-xs); color: var(--color-text-faint); margin-top: var(--space-6);
  line-height: 1.5; max-width: 68ch;
}

/* ── cuvette visualization ──────────────────────────────── */
.spectro-lab__cuvette-row {
  display: flex; align-items: center; gap: var(--space-5); margin: var(--space-5) 0;
  justify-content: center;
}
.spectro-lab__cuvette {
  width: 80px; height: 120px; border-radius: 4px 4px var(--radius-xl) var(--radius-xl);
  border: 2px solid oklch(from var(--color-text) l c h / 0.25);
  position: relative; overflow: hidden;
  background: rgba(200, 220, 255, 0.04);
}
.spectro-lab__cuvette-fill {
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 85%; transition: background-color 0.4s ease, opacity 0.4s ease;
}
.spectro-lab__cuvette-label {
  font-family: var(--font-mono); font-size: var(--text-xs); text-align: center;
  margin-top: var(--space-2); color: var(--sp-muted);
}
.spectro-lab__light-arrow {
  font-size: 1.5rem; color: var(--sp-muted); opacity: 0.6;
}

/* ── EM spectrum info panel ─────────────────────────────── */
.spectro-lab__info-panel {
  padding: var(--space-4); border-radius: var(--radius-xl);
  border: 1px solid var(--color-divider);
  background: oklch(from var(--sp-accent) l c h / 0.06);
  margin: var(--space-4) 0;
}
.spectro-lab__info-panel h4 {
  font-size: var(--text-sm); font-weight: 700; color: var(--sp-accent); margin-bottom: var(--space-2);
}
.spectro-lab__info-panel p { font-size: var(--text-sm); color: var(--sp-muted); line-height: 1.6; }

/* ── choices / feedback ─────────────────────────────────── */
.spectro-lab__choices { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.spectro-lab__choice {
  padding: 0.5rem 1rem; border-radius: var(--radius-full); font-size: var(--text-sm);
  border: 1px solid var(--color-border); background: oklch(from var(--color-text) l c h / 0.04);
  color: var(--sp-ink); cursor: pointer; transition: all var(--transition-interactive);
}
.spectro-lab__choice:hover { border-color: oklch(from var(--sp-accent) l c h / 0.5); }
.spectro-lab__choice--correct { background: oklch(from var(--sp-ok) l c h / 0.15); border-color: var(--sp-ok); color: var(--sp-ok); }
.spectro-lab__choice--wrong { background: oklch(from var(--sp-no) l c h / 0.15); border-color: var(--sp-no); color: var(--sp-no); }
.spectro-lab__choice:disabled { cursor: default; opacity: 0.75; }

.spectro-lab__feedback { font-size: var(--text-sm); margin-top: var(--space-3); line-height: 1.5; min-height: 1.5em; }
.spectro-lab__feedback--ok { color: var(--sp-ok); }
.spectro-lab__feedback--no { color: var(--sp-no); }

.spectro-lab__q { font-weight: 600; margin-bottom: var(--space-3); }

@media (max-width: 600px) {
  .spectro-lab__choices { flex-direction: column; }
  .spectro-lab__controls { flex-direction: column; align-items: stretch; }
  .spectro-lab__cuvette-row { flex-direction: column; }
}