/* ════════════════════════════════════════════════════════════════════
   CANONICAL TWEAKS PANEL — styles
   Shared 1:1 across all 5 static study guides AND the React app.
   Classes namespaced .mg-tweaks-* to avoid collision with the legacy
   .tweaks/.tweak-row inline styles still living in s1's <style> block.
   Tokens come from the header partial (.app-header --hdr-*); this
   partial is loaded only on pages that also load header.css.
   ════════════════════════════════════════════════════════════════════ */

.mg-tweaks {
  /* Re-declare scoped tokens here too so the panel works even when it
     renders outside the .app-header subtree (it usually does). */
  --hdr-bg: hsl(228 18% 6%);
  --hdr-surface-2: hsl(228 12% 13%);
  --hdr-surface-3: hsl(228 10% 17%);
  --hdr-border: hsl(228 10% 19%);
  --hdr-border-strong: hsl(228 10% 28%);
  --hdr-fg: hsl(220 20% 97%);
  --hdr-muted: hsl(220 8% 60%);
  --hdr-primary: hsl(150 70% 48%);
  --hdr-primary-soft: hsl(150 70% 48% / .14);
  --hdr-grad: linear-gradient(135deg, hsl(150 70% 48%) 0%, hsl(180 80% 50%) 100%);
  --hdr-r-sm: 6px;
  --hdr-r-md: 10px;
  --hdr-r-lg: 14px;
  --hdr-r-full: 999px;
  --hdr-dur: 220ms;
  --hdr-ease-out: cubic-bezier(.16, 1, .3, 1);
  --hdr-shadow-lg: 0 24px 50px -16px hsl(0 0% 0% / .65), 0 0 0 1px hsl(228 10% 19%);

  position: fixed;
  top: 76px;
  right: 16px;
  width: 280px;
  max-width: calc(100vw - 32px);
  background: var(--hdr-surface-2);
  border: 1px solid var(--hdr-border);
  border-radius: var(--hdr-r-lg);
  box-shadow: var(--hdr-shadow-lg);
  color: var(--hdr-fg);
  font-family: 'Inter', 'Poppins', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  z-index: 70;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity var(--hdr-dur) var(--hdr-ease-out),
              transform var(--hdr-dur) var(--hdr-ease-out);
}
.mg-tweaks[data-open="true"] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

html[data-theme="light"] .mg-tweaks {
  --hdr-bg: hsl(220 25% 98%);
  --hdr-surface-2: hsl(220 20% 97%);
  --hdr-surface-3: hsl(220 15% 94%);
  --hdr-border: hsl(220 15% 88%);
  --hdr-border-strong: hsl(220 15% 78%);
  --hdr-fg: hsl(220 30% 14%);
  --hdr-muted: hsl(220 12% 45%);
  --hdr-primary: hsl(220 75% 38%);
  --hdr-primary-soft: hsl(220 75% 38% / .10);
  --hdr-grad: linear-gradient(135deg, hsl(220 75% 38%) 0%, hsl(195 85% 42%) 100%);
  --hdr-shadow-lg: 0 18px 40px -12px hsl(220 30% 14% / .18), 0 6px 16px hsl(220 30% 14% / .06);
}

.mg-tweaks__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px 8px;
  border-bottom: 1px solid var(--hdr-border);
}
.mg-tweaks__title {
  margin: 0;
  font-family: 'Poppins', 'Inter', system-ui, sans-serif;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--hdr-muted);
}
.mg-tweaks__close {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--hdr-muted);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: var(--hdr-r-sm);
  display: inline-grid;
  place-items: center;
  transition: background var(--hdr-dur), color var(--hdr-dur);
}
.mg-tweaks__close:hover {
  background: var(--hdr-surface-3);
  color: var(--hdr-fg);
}

.mg-tweaks__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 14px 14px;
}
.mg-tweaks__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  min-height: 36px;
}
.mg-tweaks__row + .mg-tweaks__row { border-top: 1px solid var(--hdr-border); }
.mg-tweaks__row--disabled { opacity: .65; }

.mg-tweaks__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--hdr-fg);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.mg-tweaks__badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 2px 6px;
  border-radius: var(--hdr-r-full);
  background: var(--hdr-surface-3);
  color: var(--hdr-muted);
  border: 1px solid var(--hdr-border);
}

/* Segmented control (font-size S / M / L) */
.mg-tweaks__seg {
  display: inline-flex;
  padding: 2px;
  background: var(--hdr-surface-3);
  border: 1px solid var(--hdr-border);
  border-radius: var(--hdr-r-md);
}
.mg-tweaks__seg-btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--hdr-muted);
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  width: 32px;
  height: 28px;
  border-radius: calc(var(--hdr-r-md) - 2px);
  cursor: pointer;
  transition: all var(--hdr-dur);
}
.mg-tweaks__seg-btn:hover { color: var(--hdr-fg); }
.mg-tweaks__seg-btn[aria-pressed="true"] {
  background: var(--hdr-grad);
  color: hsl(228 30% 6%);
}
html[data-theme="light"] .mg-tweaks__seg-btn[aria-pressed="true"] { color: #fff; }

/* Switch (confetti, sounds) */
.mg-tweaks__switch {
  appearance: none;
  position: relative;
  width: 38px;
  height: 22px;
  border-radius: var(--hdr-r-full);
  background: var(--hdr-surface-3);
  border: 1px solid var(--hdr-border);
  cursor: pointer;
  transition: background var(--hdr-dur), border-color var(--hdr-dur);
  flex-shrink: 0;
}
.mg-tweaks__switch::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 2px;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--hdr-muted);
  transition: left var(--hdr-dur) var(--hdr-ease-out), background var(--hdr-dur);
}
.mg-tweaks__switch[aria-pressed="true"] {
  background: var(--hdr-primary-soft);
  border-color: var(--hdr-primary);
}
.mg-tweaks__switch[aria-pressed="true"]::after {
  left: 18px;
  background: var(--hdr-primary);
}
.mg-tweaks__switch[aria-disabled="true"],
.mg-tweaks__switch:disabled {
  cursor: not-allowed;
}

@media (max-width: 760px) {
  .mg-tweaks { top: 68px; right: 12px; width: calc(100vw - 24px); max-width: 340px; }
}