/* ═══════════════════════════════════════════════════════
   MedFlash — Frontend Flashcard Styles v1.0
   Uses CSS custom properties so themes can be swapped
   by overriding variables on .mf-wrap
   ═══════════════════════════════════════════════════════ */

.mf-wrap {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem;
  box-sizing: border-box;
}
.mf-wrap *, .mf-wrap *::before, .mf-wrap *::after { box-sizing: border-box; }

/* ── Toolbar ──────────────────────────────────── */
.mf-toolbar {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--mf-toolbar-bg);
  border: 1px solid var(--mf-toolbar-border);
  border-radius: .875rem;
}
.mf-toolbar-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}
.mf-toolbar-search-row { flex: 1; }

/* Search with clear button */
.mf-search-wrap {
  position: relative;
  flex: 1;
  min-width: 200px;
  display: flex;
  align-items: center;
}
.mf-search {
  width: 100%;
  padding: .55rem 2.2rem .55rem .875rem;
  border: 1.5px solid #cbd5e1;
  border-radius: .5rem;
  font-size: .9rem;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  background: #fff;
  box-sizing: border-box;
}
.mf-search:focus { border-color: var(--mf-accent); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.mf-search-clear {
  position: absolute;
  right: .5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: #94a3b8;
  font-size: 1rem;
  line-height: 1;
  padding: .2rem .3rem;
  border-radius: 50%;
  transition: color .15s, background .15s;
}
.mf-search-clear:hover { color: #e11d48; background: #fee2e2; }

.mf-cat-filter {
  padding: .55rem .875rem;
  border: 1.5px solid #cbd5e1;
  border-radius: .5rem;
  font-size: .9rem;
  background: #fff;
  cursor: pointer;
  outline: none;
}
.mf-mode-btn {
  padding: .5rem 1.1rem;
  border: 1.5px solid var(--mf-accent);
  border-radius: .5rem;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  background: #fff;
  color: var(--mf-accent);
  transition: all .15s;
  line-height: 1;
}
.mf-mode-btn:hover, .mf-mode-btn.active { background: var(--mf-accent); color: #fff; }
.mf-shuffle-btn {
  padding: .5rem 1.1rem;
  border: 1.5px solid #7c3aed;
  border-radius: .5rem;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  background: #fff;
  color: #7c3aed;
  transition: all .15s;
  line-height: 1;
}
.mf-shuffle-btn:hover { background: #7c3aed; color: #fff; }
.mf-reset-btn {
  padding: .5rem 1.1rem;
  border: 1.5px solid #e11d48;
  border-radius: .5rem;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  background: #fff;
  color: #e11d48;
  transition: all .15s;
  line-height: 1;
}
.mf-reset-btn:hover { background: #e11d48; color: #fff; }

/* ── Stats & Progress ─────────────────────────── */
.mf-stats {
  display: flex;
  gap: 1.5rem;
  margin-bottom: .875rem;
  font-size: .85rem;
  color: #64748b;
  flex-wrap: wrap;
  min-height: 1.2rem;
}
.mf-stats strong { color: #1e293b; }
.mf-progress-wrap {
  height: 8px;
  background: #e2e8f0;
  border-radius: 9999px;
  margin-bottom: 1.75rem;
  overflow: hidden;
}
.mf-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--mf-progress-from), var(--mf-progress-to));
  border-radius: 9999px;
  transition: width .5s ease;
  min-width: 0;
}

/* ── Card Grid ────────────────────────────────── */
.mf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* ── Flip Card ────────────────────────────────── */
.mf-card-wrap {
  perspective: 900px;
  height: 240px;
  cursor: pointer;
}
.mf-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.4, 2, .6, 1);
}
.mf-card-wrap.flipped .mf-card-inner { transform: rotateY(180deg); }

.mf-card-front,
.mf-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.mf-card-front {
  background: linear-gradient(145deg, var(--mf-front-bg-from) 0%, var(--mf-front-bg-to) 100%);
  color: var(--mf-front-text);
  box-shadow: 0 4px 20px var(--mf-front-shadow), 0 1px 3px rgba(0,0,0,.1);
}

.mf-card-back {
  background: var(--mf-back-bg);
  border: 1px solid var(--mf-back-border);
  box-shadow: 0 4px 20px rgba(0,0,0,.09);
  transform: rotateY(180deg);
  overflow-y: auto;
  align-items: flex-start;
  justify-content: flex-start;
  -webkit-overflow-scrolling: touch;
}

/* Front typography */
.mf-card-category {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  opacity: .65;
  margin-bottom: .6rem;
}
.mf-card-brand {
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: .3rem;
}
.mf-card-generic {
  font-size: .95rem;
  opacity: .8;
  margin-bottom: .75rem;
}
.mf-card-class {
  font-size: .75rem;
  background: rgba(255,255,255,.14);
  display: inline-block;
  padding: .2rem .65rem;
  border-radius: 9999px;
}
.mf-card-hint {
  font-size: .7rem;
  opacity: .45;
  margin-top: auto;
  text-align: right;
}

/* Controlled badge */
.mf-controlled-badge {
  display: inline-block;
  background: rgba(239,68,68,.22);
  border: 1px solid rgba(239,68,68,.45);
  color: #fca5a5;
  font-size: .63rem;
  font-weight: 700;
  padding: .1rem .45rem;
  border-radius: 9999px;
  margin-left: .4rem;
  vertical-align: middle;
}

/* Back typography */
.mf-back-label {
  font-size: .63rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mf-back-label);
  margin-top: .75rem;
}
.mf-back-label:first-child { margin-top: 0; }
.mf-back-value {
  font-size: .84rem;
  color: var(--mf-back-text);
  line-height: 1.45;
  margin-top: .15rem;
}
.mf-card-brand-back {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--mf-back-brand);
  margin-bottom: .25rem;
}

/* ── Speak / TTS Button ──────────────────────────── */
/* Row wrapping brand name + speak button */
.mf-card-brand-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .3rem;
}
.mf-card-brand-row .mf-card-brand {
  margin-bottom: 0;   /* reset — row handles spacing */
}
.mf-speak-btn {
  flex-shrink: 0;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3);
  color: var(--mf-front-text);
  border-radius: 50%;
  width: 1.75rem;
  height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  cursor: pointer;
  transition: background .15s, transform .1s;
  line-height: 1;
  padding: 0;
}
.mf-speak-btn:hover {
  background: rgba(255,255,255,.3);
  transform: scale(1.12);
}
.mf-speak-btn.speaking {
  background: rgba(255,255,255,.35);
  animation: mf-pulse 1s ease-in-out infinite;
}
@keyframes mf-pulse {
  0%, 100% { transform: scale(1);    box-shadow: 0 0 0 0 rgba(255,255,255,.4); }
  50%       { transform: scale(1.1);  box-shadow: 0 0 0 5px rgba(255,255,255,0); }
}

/* ── Mastered State ───────────────────────────── */
.mf-card-wrap.mastered .mf-card-front {
  background: linear-gradient(145deg, var(--mf-mastered-from), var(--mf-mastered-to));
}
.mf-mastered-badge {
  position: absolute;
  top: .75rem;
  right: .75rem;
  background: #10b981;
  color: #fff;
  font-size: .63rem;
  font-weight: 700;
  padding: .2rem .55rem;
  border-radius: 9999px;
  line-height: 1.4;
}

/* ── Quiz Mode Buttons ────────────────────────── */
.mf-quiz-actions {
  display: flex;
  gap: .75rem;
  margin-top: .875rem;
  width: 100%;
}
.mf-btn-correct,
.mf-btn-incorrect {
  flex: 1;
  padding: .6rem .5rem;
  border: none;
  border-radius: .5rem;
  font-weight: 700;
  cursor: pointer;
  font-size: .82rem;
  transition: background .15s, transform .1s;
  line-height: 1;
}
.mf-btn-correct  { background: #059669; color: #fff; }
.mf-btn-correct:hover  { background: #047857; }
.mf-btn-correct:active  { transform: scale(.97); }
.mf-btn-incorrect { background: #dc2626; color: #fff; }
.mf-btn-incorrect:hover { background: #b91c1c; }
.mf-btn-incorrect:active { transform: scale(.97); }

/* ── Empty State ──────────────────────────────── */
.mf-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3.5rem 1rem;
  color: #64748b;
  font-size: 1rem;
  background: #f8fafc;
  border: 2px dashed #e2e8f0;
  border-radius: 1rem;
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 580px) {
  .mf-grid { grid-template-columns: 1fr; }
  .mf-card-wrap { height: 255px; }
  .mf-toolbar { gap: .5rem; }
  .mf-search { min-width: 0; width: 100%; flex: unset; }
}

/* ── Responsive — Tablet (max 768px) ─────────────── */
@media (max-width: 768px) {
  .mf-wrap { padding: .75rem; }

  .mf-toolbar { padding: .875rem 1rem; }
  .mf-toolbar-search-row { flex-wrap: nowrap; }

  .mf-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
  }

  .mf-card-wrap { height: 230px; }
  .mf-card-brand { font-size: 1.45rem; }
}

/* ── Responsive — Mobile (max 560px) ─────────────── */
@media (max-width: 560px) {
  .mf-wrap { padding: .5rem; }

  /* Toolbar stacks fully */
  .mf-toolbar { padding: .75rem; gap: .6rem; }
  .mf-toolbar-search-row { flex-direction: column; align-items: stretch; }
  .mf-search-wrap { min-width: 0; }
  .mf-cat-filter { width: 100%; }

  /* Button row wraps tightly */
  .mf-toolbar-btn-row { gap: .4rem; }
  .mf-mode-btn,
  .mf-shuffle-btn,
  .mf-reset-btn {
    padding: .45rem .7rem;
    font-size: .78rem;
  }

  /* Single column cards, taller for back content */
  .mf-grid { grid-template-columns: 1fr; gap: .875rem; }
  .mf-card-wrap { height: 270px; }
  .mf-card-front, .mf-card-back { padding: 1rem 1.125rem; }
  .mf-card-brand { font-size: 1.4rem; }

  /* Progress & stats */
  .mf-stats { gap: .875rem; font-size: .8rem; }
  .mf-progress-wrap { margin-bottom: 1.25rem; }

  /* Quiz buttons bigger touch targets */
  .mf-btn-correct,
  .mf-btn-incorrect { padding: .75rem .5rem; font-size: .85rem; }
}

/* ── Responsive — Very small (max 380px) ─────────── */
@media (max-width: 380px) {
  .mf-card-brand { font-size: 1.25rem; }
  .mf-toolbar-btn-row { flex-wrap: wrap; }
  .mf-reset-btn { width: 100%; text-align: center; }
}

/* ── Load More ────────────────────────────────── */
.mf-load-more-wrap {
  display: flex;
  justify-content: center;
  padding: 1.75rem 0 .5rem;
}
.mf-load-more-btn {
  padding: .7rem 2.25rem;
  background: #fff;
  border: 2px solid var(--mf-accent);
  color: var(--mf-accent);
  border-radius: .6rem;
  font-size: .92rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, color .15s, transform .1s;
  letter-spacing: .01em;
}
.mf-load-more-btn:hover {
  background: var(--mf-accent);
  color: #fff;
  transform: translateY(-1px);
}
.mf-load-more-btn:active { transform: translateY(0); }

/* ── Mastered Toolbar Button ──────────────────── */
.mf-mastered-btn {
  padding: .5rem 1.1rem;
  border: 1.5px solid #d97706;
  border-radius: .5rem;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  background: #fffbeb;
  color: #92400e;
  transition: all .15s;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}
.mf-mastered-btn:hover { background: #fef3c7; border-color: #b45309; }

/* ── Card Exit / Enter Animations ────────────── */
@keyframes mf-card-out {
  0%   { opacity: 1; transform: scale(1) translateY(0); }
  60%  { opacity: 0; transform: scale(.88) translateY(-18px); }
  100% { opacity: 0; transform: scale(.85) translateY(-24px); }
}
@keyframes mf-card-in {
  0%   { opacity: 0; transform: translateY(20px) scale(.96); }
  100% { opacity: 1; transform: translateY(0)    scale(1); }
}
@keyframes mf-shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-7px); }
  40%       { transform: translateX(7px); }
  60%       { transform: translateX(-5px); }
  80%       { transform: translateX(5px); }
}
.mf-card-mastered-out {
  animation: mf-card-out .4s ease forwards;
  pointer-events: none;
}
.mf-card-enter {
  animation: mf-card-in .35s ease forwards;
}
.mf-shake {
  animation: mf-shake .45s ease;
}

/* ── Mastered Drawer Overlay ──────────────────── */
.mf-drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 99998;
  backdrop-filter: blur(2px);
}
.mf-drawer-overlay.open { display: block; }

/* ── Mastered Drawer ──────────────────────────── */
.mf-mastered-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  max-width: 96vw;
  height: 100vh;
  background: #fff;
  z-index: 99999;
  box-shadow: -8px 0 32px rgba(0,0,0,.18);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.mf-mastered-drawer.open { transform: translateX(0); }

.mf-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid #e5e7eb;
  flex-shrink: 0;
  background: #fffbeb;
}
.mf-drawer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #92400e;
}
.mf-drawer-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: #6b7280;
  padding: .25rem .4rem;
  border-radius: .3rem;
  line-height: 1;
  transition: background .15s, color .15s;
}
.mf-drawer-close:hover { background: #fee2e2; color: #dc2626; }

.mf-drawer-list {
  flex: 1;
  overflow-y: auto;
  padding: .75rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.mf-drawer-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .65rem .875rem;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: .5rem;
  transition: background .15s;
}
.mf-drawer-item:hover { background: #f0fdf4; border-color: #bbf7d0; }

.mf-drawer-names {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  min-width: 0;
}
.mf-drawer-brand {
  font-weight: 700;
  font-size: .9rem;
  color: #1e293b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mf-drawer-generic {
  font-size: .78rem;
  color: #64748b;
}
.mf-drawer-cat {
  font-size: .68rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.mf-unmaster-btn {
  flex-shrink: 0;
  padding: .35rem .7rem;
  font-size: .75rem;
  font-weight: 600;
  background: #fff;
  border: 1.5px solid #d1d5db;
  border-radius: .4rem;
  cursor: pointer;
  color: #374151;
  white-space: nowrap;
  transition: all .15s;
}
.mf-unmaster-btn:hover {
  border-color: #f59e0b;
  background: #fffbeb;
  color: #92400e;
}

.mf-drawer-empty {
  text-align: center;
  color: #9ca3af;
  font-size: .9rem;
  padding: 2rem 1rem;
}

/* ── Responsive: drawer full-width on mobile ──── */
@media (max-width: 480px) {
  .mf-mastered-drawer { width: 100vw; }
}

/* ══════════════════════════════════════════════
   Theme Picker
══════════════════════════════════════════════ */
.mf-theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  font-size: 1.1rem;
  background: transparent;
  border: 1.5px solid var(--mf-toolbar-border, #e2e8f0);
  border-radius: .5rem;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .12s;
  flex-shrink: 0;
}
.mf-theme-btn:hover {
  background: var(--mf-back-border, #e2e8f0);
  border-color: var(--mf-accent, #2563eb);
  transform: scale(1.08);
}
.mf-theme-btn[aria-expanded="true"] {
  background: var(--mf-back-border, #e2e8f0);
  border-color: var(--mf-accent, #2563eb);
}

.mf-theme-panel {
  position: relative;
  margin: .5rem 0 0;
  background: var(--mf-toolbar-bg, #f8fafc);
  border: 1.5px solid var(--mf-toolbar-border, #e2e8f0);
  border-radius: .75rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.10);
  overflow: hidden;
  animation: mf-panel-in .16s ease;
}
@keyframes mf-panel-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mf-theme-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .6rem 1rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--mf-back-label, #64748b);
  border-bottom: 1px solid var(--mf-toolbar-border, #e2e8f0);
}
.mf-theme-close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: .95rem;
  color: var(--mf-back-label, #64748b);
  padding: .1rem .3rem;
  border-radius: .3rem;
  line-height: 1;
  transition: background .12s;
}
.mf-theme-close:hover { background: var(--mf-back-border, #e2e8f0); }

.mf-theme-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  padding: .85rem 1rem;
}

.mf-theme-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .35rem;
  padding: .5rem .6rem;
  background: transparent;
  border: 2px solid transparent;
  border-radius: .6rem;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .12s;
  min-width: 4.5rem;
}
.mf-theme-swatch:hover {
  background: var(--mf-back-border, #e2e8f0);
  transform: translateY(-2px);
}
.mf-theme-swatch.active {
  border-color: var(--mf-accent, #2563eb);
  background: var(--mf-back-border, #e2e8f0);
}

.mf-swatch-preview {
  display: block;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: .45rem;
  box-shadow: 0 2px 6px rgba(0,0,0,.18);
  transition: transform .12s;
}
.mf-theme-swatch:hover .mf-swatch-preview { transform: scale(1.08); }
.mf-theme-swatch.active .mf-swatch-preview {
  box-shadow: 0 0 0 2.5px var(--mf-accent, #2563eb), 0 2px 6px rgba(0,0,0,.18);
}

.mf-swatch-label {
  font-size: .7rem;
  font-weight: 600;
  color: var(--mf-back-label, #64748b);
  white-space: nowrap;
  text-align: center;
}
.mf-theme-swatch.active .mf-swatch-label { color: var(--mf-accent, #2563eb); }