/* ═══════════════════════════════════════════════════════
   Radioactivity — Clay Design System Extensions
   ═══════════════════════════════════════════════════════ */

/* ── Sidebar Toggle Button ── */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 72px;
  left: 12px;
  z-index: 200;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(160,150,180,0.15);
  border-radius: 20px;
  padding: 8px 14px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-smooth);
  box-shadow: var(--shadow-card);
}
.sidebar-toggle:hover {
  background: rgba(255,255,255,1);
  border-color: var(--accent);
  color: var(--accent);
}
.sidebar-toggle i {
  font-size: 14px;
}

/* ── Content Sidebar ── */
.content-sidebar {
  position: fixed;
  top: 64px;
  left: 0;
  bottom: 0;
  z-index: 150;
  width: 220px;
  background: rgba(255,255,255,0.80);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-right: 1px solid rgba(160,150,180,0.12);
  overflow-y: auto;
  padding: 20px 0;
  transition: transform 0.35s var(--ease-smooth);
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: rgba(160,150,180,0.2) transparent;
}
.content-sidebar::-webkit-scrollbar { width: 4px; }
.content-sidebar::-webkit-scrollbar-thumb { background: rgba(160,150,180,0.2); border-radius: 4px; }

.content-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px 16px;
  border-bottom: 1px solid rgba(160,150,180,0.08);
  margin-bottom: 12px;
}
.content-sidebar-brand {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 15px;
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: 4px;
  border-radius: 8px;
  transition: all var(--dur-fast);
}
.sidebar-close:hover {
  background: rgba(160,150,180,0.1);
  color: var(--text-primary);
}

.content-sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 12px;
}
.content-sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease-smooth);
  font-family: var(--font-heading);
}
.content-sidebar-link:hover {
  background: rgba(124,58,237,0.06);
  color: var(--text-primary);
}
.content-sidebar-link.active {
  background: rgba(124,58,237,0.1);
  color: var(--accent);
}
.sidebar-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background: rgba(160,150,180,0.1);
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: all var(--dur-fast);
}
.content-sidebar-link.active .sidebar-num {
  background: rgba(124,58,237,0.15);
  color: var(--accent);
}
.sidebar-label {
  line-height: 1.2;
}

/* ── Content Main (wrapper) ── */
.content-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  position: relative;
  z-index: 1;
}

.klo-box { background:rgba(124,58,237,0.04);border-left:4px solid var(--accent);border-radius:16px;padding:14px 18px;margin-bottom:16px;font-size:14px;color:var(--text-muted); }
.klo-box strong { color:var(--text-primary); }

.info-box { background:rgba(14,165,233,0.04);border-left:4px solid var(--accent-blue);border-radius:16px;padding:14px 18px;margin:14px 0;font-size:14px;color:var(--text-muted); }
.info-box h4 { font-family:var(--font-heading);font-size:14px;margin-bottom:6px; }
.info-box p { color:var(--text-muted);margin:0; }

.sim-container { background:linear-gradient(135deg,rgba(16,185,129,0.04),rgba(14,165,233,0.03));border:1px solid rgba(160,150,180,0.1);border-radius:24px;padding:24px;margin:20px 0;transition:all var(--dur-med) var(--ease-smooth); }
.sim-container:hover { border-color:rgba(124,58,237,0.25); }
.sim-container canvas { border-radius:16px;max-width:100%;display:block;margin:12px auto;background:#f8f7fc;border:1px solid rgba(160,150,180,0.08); }
.input-group { margin-bottom:12px; }
.input-group label { font-weight:600;color:var(--text-muted);font-size:13px;display:block;margin-bottom:4px; }
.input-group input[type="number"],.input-group select { width:100%;padding:10px 14px;border:2px solid rgba(160,150,180,0.15);border-radius:16px;font-size:14px;background:#EFEBF5;color:var(--text-primary);font-family:var(--font-body);transition:all var(--dur-fast); }
.input-group input[type="number"]:focus,.input-group select:focus { outline:none;background:#fff;border-color:var(--accent);box-shadow:0 0 0 4px rgba(124,58,237,0.12); }

.equation { font-family:var(--font-heading);font-size:1.05rem;background:linear-gradient(135deg,rgba(124,58,237,0.05),rgba(219,39,119,0.04));border-radius:16px;padding:12px 18px;margin:10px 0;text-align:center;color:var(--text-primary);font-weight:600; }

.btn-group { display:flex;flex-wrap:wrap;gap:8px;margin:10px 0; }
.pill { display:inline-flex;align-items:center;padding:6px 16px;border-radius:20px;border:2px solid rgba(160,150,180,0.15);background:transparent;color:var(--text-muted);font-size:13px;font-weight:600;cursor:pointer;transition:all var(--dur-fast);font-family:var(--font-heading); }
.pill:hover,.pill.active-alpha { border-color:var(--accent);color:var(--accent); }
.pill.active-alpha { background:rgba(124,58,237,0.1); }

.checkbox-group { display:flex;flex-wrap:wrap;gap:12px;margin:10px 0; }
.checkbox-group label { font-weight:600;color:var(--text-muted);font-size:13px;display:flex;align-items:center;gap:6px; }
.checkbox-group input[type="checkbox"] { accent-color:var(--accent); }

.digital-display { display:inline-block;background:rgba(51,47,58,0.9);color:#e0f2fe;padding:4px 14px;border-radius:10px;font-family:var(--font-heading);font-size:16px;font-weight:700;min-width:50px;text-align:center; }

.score-tracker { font-family:var(--font-heading);font-size:14px;font-weight:600;color:var(--text-muted); }
.score-tracker strong { color:var(--accent); }

.scenario-card { background:rgba(255,255,255,0.5);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(160,150,180,0.1);border-radius:20px;padding:20px;margin:12px 0; }
.scenario-feedback { margin-top:8px;padding:10px 14px;border-radius:12px;font-size:13px;font-weight:600; }
.scenario-feedback.correct { background:rgba(16,185,129,0.1);color:var(--accent-emerald); }
.scenario-feedback.incorrect { background:rgba(244,63,94,0.1);color:var(--accent-rose); }

.warning-box { background:rgba(244,63,94,0.06);border-left:4px solid var(--accent-rose);border-radius:16px;padding:14px 18px;margin:14px 0;font-size:14px;color:var(--text-muted); }
.warning-box ul { padding-left:20px;margin-top:6px; }

.grid-2 { display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:16px 0; }
@media (max-width:768px) { .grid-2 { grid-template-columns:1fr; } }

.particle-container { display:flex;flex-wrap:wrap;gap:4px;padding:16px;background:#f8f7fc;border-radius:16px;border:1px solid rgba(160,150,180,0.08);min-height:100px; }
.particle-container .particle { width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:9px;font-weight:700;color:#fff; }

.result-box { background:rgba(16,185,129,0.06);border:1px solid rgba(16,185,129,0.2);border-radius:20px;padding:16px 20px;margin-top:16px;text-align:center;font-weight:700;color:var(--accent-emerald);opacity:0;transform:translateY(10px);transition:all 0.3s var(--ease-smooth); }
.result-box.show { opacity:1;transform:translateY(0); }
.result-box strong { color:inherit; }

.btn,.btn-primary,.sim-container button { display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--radius-btn);font-family:var(--font-body);font-size:14px;font-weight:700;padding:10px 22px;cursor:pointer;transition:all var(--dur-fast);text-decoration:none;line-height:1;min-height:44px;background:linear-gradient(135deg,var(--accent-light),var(--accent));color:#fff;box-shadow:var(--shadow-btn); }
.btn:hover,.btn-primary:hover,.sim-container button:hover { transform:translateY(-2px);box-shadow:var(--shadow-btn-hover); }
.btn:active,.btn-primary:active,.sim-container button:active { transform:scale(0.95);box-shadow:var(--shadow-pressed); }
.btn-success { background:linear-gradient(135deg,#34D399,var(--accent-emerald)) !important;color:#fff !important; }
.btn-danger { background:linear-gradient(135deg,#FB7185,var(--accent-rose)) !important;color:#fff !important; }
.btn-sm { padding:6px 14px !important;font-size:13px !important;min-height:36px !important; }

.led { display:inline-block;width:14px;height:14px;border-radius:50%; }
.led.on { background:#10b981;box-shadow:0 0 6px rgba(16,185,129,0.5); }
.led.off { background:#ef4444; }

.notification { padding:12px 20px;border-radius:16px;margin-bottom:16px;font-size:14px;font-weight:600;display:none; }
.notification.show { display:block; }
.notification.success { background:rgba(16,185,129,0.1);color:var(--accent-emerald); }
.notification.error { background:rgba(244,63,94,0.1);color:var(--accent-rose); }

.svg-diagram { max-width:100%;height:auto;border-radius:12px;margin:12px 0; }

.footer { text-align:center;color:var(--text-muted);padding:24px;font-size:13px; }

h2 { font-family:var(--font-heading);font-size:1.4rem;font-weight:800;color:var(--text-primary);margin-bottom:16px; }
h3 { font-family:var(--font-heading);font-size:1.1rem;font-weight:700;color:var(--text-primary);margin:20px 0 10px; }

.card { opacity:0;transform:translateY(24px);transition:opacity 0.6s var(--ease-smooth),transform 0.6s var(--ease-smooth),box-shadow var(--dur-med) var(--ease-smooth); }
.card.visible { opacity:1;transform:translateY(0); }

/* ── Quiz Cards ── */
.quiz-card {
  background: rgba(255,255,255,0.5);
  border-radius: 24px;
  padding: 20px 24px;
  margin-bottom: 16px;
  border: 1px solid rgba(160,150,180,0.1);
  transition: all var(--dur-med) var(--ease-smooth);
}
.quiz-card:hover { background: rgba(255,255,255,0.7); }
.quiz-card p.q-text {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  font-family: var(--font-heading);
  font-size: 15px;
}
.quiz-card label {
  display: block;
  padding: 10px 18px;
  margin: 6px 0;
  border-radius: 16px;
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-smooth);
  border: 2px solid rgba(160,150,180,0.12);
  font-family: var(--font-body);
  font-weight: 500;
}
.quiz-card label:hover {
  background: rgba(124,58,237,0.04);
  border-color: rgba(124,58,237,0.25);
  transform: translateX(4px);
}
.quiz-card label.correct {
  background: rgba(16,185,129,0.1);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}
.quiz-card label.incorrect {
  background: rgba(244,63,94,0.1);
  border-color: var(--accent-rose);
  color: var(--accent-rose);
}
.quiz-card input[type="radio"] {
  margin-right: 12px;
  accent-color: var(--accent);
  transform: scale(1.15);
}
.quiz-feedback {
  margin-top: 8px;
  padding: 10px 16px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 600;
  display: none;
  font-family: var(--font-body);
}
.quiz-feedback.show { display: block; animation: slideIn 0.3s var(--ease-smooth); }
.quiz-feedback.correct-fb { background: rgba(16,185,129,0.1); color: var(--accent-emerald); }
.quiz-feedback.incorrect-fb { background: rgba(244,63,94,0.1); color: var(--accent-rose); }

/* ── Quiz Score Section ── */
.quiz-score-section {
  margin-top: 24px;
  padding: 20px;
  background: rgba(255,255,255,0.4);
  border-radius: 24px;
  border: 1px solid rgba(160,150,180,0.1);
}
.quiz-score-bar {
  width: 100%;
  height: 12px;
  background: rgba(160,150,180,0.15);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 12px;
}
.quiz-score-fill {
  height: 100%;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  border-radius: 6px;
  transition: width 1s var(--ease-smooth);
  width: 0%;
}
.quiz-score-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.quiz-score-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text-primary);
}
.quiz-encouragement {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
}
.quiz-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
  justify-content: center;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar-toggle { display: flex; }
  .sidebar-close { display: inline-flex; }
  .content-sidebar { transform: translateX(-100%); }
  .content-sidebar.open { transform: translateX(0); }
  .content-main { padding: 16px; }
  .card, .sim-container { padding: 16px; }
}