/* Electricity & Magnetism Lab — Premium Styles */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root { --em-accent: #6366f1; --em-accent2: #f59e0b; --em-positive: #ef4444; --em-negative: #3b82f6; }

.text-gradient {
  background: linear-gradient(135deg, #6366f1 0%, #3b82f6 40%, #f59e0b 70%, #ef4444 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.em-tabs { display: flex; gap: 4px; padding: 6px; overflow-x: auto; }
.em-tab-btn {
  flex: 1; min-width: 110px; padding: 10px 12px; font-size: 0.82rem; border-radius: var(--radius-md);
  background: transparent; border: 1px solid var(--color-border); color: var(--color-text);
  cursor: pointer; transition: all 0.25s; white-space: nowrap; font-family: 'Outfit',system-ui;
}
.em-tab-btn.active { background: linear-gradient(135deg, #6366f1, #3b82f6); color: #fff; border-color: #6366f1; box-shadow: 0 4px 15px rgba(99,102,241,0.3); }
.em-tab-btn:hover:not(.active) { border-color: #6366f1; background: rgba(99,102,241,0.1); }
.em-tab-content.hidden { display: none !important; }

.section-desc { color: var(--color-text-secondary); font-size: 0.88rem; margin-bottom: 16px; }
canvas { border-radius: var(--radius-lg); border: 1px solid var(--color-border); display: block; width: 100%; background: #0a0a18; }

.circuit-layout, .motor-layout { display: grid; grid-template-columns: 1fr 260px; gap: 20px; align-items: start; }
@media (max-width: 900px) { .circuit-layout, .motor-layout { grid-template-columns: 1fr; } }

.circuit-controls, .motor-controls { display: flex; flex-direction: column; gap: 14px; }
.control-row { display: flex; flex-direction: column; gap: 4px; }
.control-row label { font-size: 0.75rem; font-weight: 600; color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
.control-row input[type="range"] { width: 100%; height: 6px; -webkit-appearance: none; background: rgba(255,255,255,0.1); border-radius: 3px; }
.control-row input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--em-accent); cursor: pointer; box-shadow: 0 0 8px rgba(99,102,241,0.4); }
.control-row span { font-size: 0.8rem; color: var(--em-accent); font-weight: 600; }

.field-controls { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; align-items: center; }
.info-panel { padding: 14px; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.5; }
.info-text { font-size: 0.85rem; color: var(--color-text-secondary); font-style: italic; }

.btn-toggle { padding: 8px 16px; border-radius: var(--radius-md); border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text); cursor: pointer; font-size: 0.85rem; transition: all 0.2s; }
.btn-toggle.on { background: rgba(34,197,94,0.2); border-color: #22c55e; color: #22c55e; }

.quiz-card { max-width: 600px; }
.quiz-question { font-size: 1.05rem; font-weight: 600; margin-bottom: 14px; line-height: 1.4; }
.quiz-options { display: flex; flex-direction: column; gap: 8px; }
.quiz-options button {
  padding: 10px 16px; text-align: left; border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface); color: var(--color-text); font-size: 0.88rem; cursor: pointer; transition: all 0.2s;
}
.quiz-options button:hover:not(:disabled) { border-color: var(--em-accent); background: rgba(99,102,241,0.1); }
.quiz-options button.correct { border-color: #22c55e; background: rgba(34,197,94,0.15); }
.quiz-options button.wrong { border-color: #ef4444; background: rgba(239,68,68,0.15); }
.quiz-options button:disabled { cursor: default; opacity: 0.8; }
.quiz-feedback { padding: 10px; font-weight: 700; text-align: center; margin-top: 10px; }
.quiz-score-badge { font-size: 0.75rem; color: var(--em-accent); font-weight: 400; }

.hidden { display: none !important; }
.mt-3 { margin-top: 12px; }