/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Segoe UI', system-ui, sans-serif; min-height: 100vh; transition: background .2s, color .2s; }
button { cursor: pointer; font: inherit; border: none; }
input, select { font: inherit; }
a { text-decoration: none; }

/* ===== CSS CUSTOM PROPERTIES ===== */

/* --- Ai & Shu (default) light --- */
[data-preset="ai-shu"][data-theme="light"] {
  --bg:          #F7F3EA;
  --bg2:         #EDE8DC;
  --surface:     #FFFFFF;
  --border:      #D6CFC0;
  --text:        #1A1510;
  --text2:       #6B5E4A;
  --accent:      #2E4A8B;
  --accent2:     #E2523B;
  --accent-text: #FFFFFF;
  --m-unknown:   #F7F3EA;
  --m-learning:  #E4B44C;
  --m-familiar:  #3B6EA5;
  --m-mastered:  #5B8C51;
  --m-unknown-t: #6B5E4A;
  --m-learning-t:#1A1510;
  --m-familiar-t:#FFFFFF;
  --m-mastered-t:#FFFFFF;
  --progress-bg: #D6CFC0;
  --shadow:      0 1px 4px rgba(0,0,0,.12);
}
/* --- Ai & Shu dark --- */
[data-preset="ai-shu"][data-theme="dark"] {
  --bg:          #16130F;
  --bg2:         #211D17;
  --surface:     #2A241C;
  --border:      #3D3628;
  --text:        #F2EDE2;
  --text2:       #A89880;
  --accent:      #7A9FE8;
  --accent2:     #E2523B;
  --accent-text: #16130F;
  --m-unknown:   #2A241C;
  --m-learning:  #C49830;
  --m-familiar:  #3B6EA5;
  --m-mastered:  #5B8C51;
  --m-unknown-t: #A89880;
  --m-learning-t:#16130F;
  --m-familiar-t:#FFFFFF;
  --m-mastered-t:#FFFFFF;
  --progress-bg: #3D3628;
  --shadow:      0 1px 4px rgba(0,0,0,.4);
}

/* --- Indigo light --- */
[data-preset="indigo"][data-theme="light"] {
  --bg:          #F4F6FB;
  --bg2:         #E8EDF6;
  --surface:     #FFFFFF;
  --border:      #CBD5E1;
  --text:        #0F1420;
  --text2:       #4B5563;
  --accent:      #4F46E5;
  --accent2:     #4F46E5;
  --accent-text: #FFFFFF;
  --m-unknown:   #F4F6FB;
  --m-learning:  #F59E0B;
  --m-familiar:  #3B82F6;
  --m-mastered:  #16A34A;
  --m-unknown-t: #4B5563;
  --m-learning-t:#1A1510;
  --m-familiar-t:#FFFFFF;
  --m-mastered-t:#FFFFFF;
  --progress-bg: #CBD5E1;
  --shadow:      0 1px 4px rgba(0,0,0,.1);
}
[data-preset="indigo"][data-theme="dark"] {
  --bg:          #0F1420;
  --bg2:         #1A2030;
  --surface:     #1E2A40;
  --border:      #2D3A50;
  --text:        #E8EDF6;
  --text2:       #8090A8;
  --accent:      #818CF8;
  --accent2:     #818CF8;
  --accent-text: #0F1420;
  --m-unknown:   #1E2A40;
  --m-learning:  #D97706;
  --m-familiar:  #3B82F6;
  --m-mastered:  #16A34A;
  --m-unknown-t: #8090A8;
  --m-learning-t:#0F1420;
  --m-familiar-t:#FFFFFF;
  --m-mastered-t:#FFFFFF;
  --progress-bg: #2D3A50;
  --shadow:      0 1px 4px rgba(0,0,0,.4);
}

/* --- Calm / Focus light --- */
[data-preset="calm"][data-theme="light"] {
  --bg:          #F1F5F9;
  --bg2:         #E2EAF2;
  --surface:     #FFFFFF;
  --border:      #CBD5E1;
  --text:        #0F172A;
  --text2:       #475569;
  --accent:      #0D9488;
  --accent2:     #0D9488;
  --accent-text: #FFFFFF;
  --m-unknown:   #F1F5F9;
  --m-learning:  #F59E0B;
  --m-familiar:  #38BDF8;
  --m-mastered:  #10B981;
  --m-unknown-t: #475569;
  --m-learning-t:#0F172A;
  --m-familiar-t:#0F172A;
  --m-mastered-t:#FFFFFF;
  --progress-bg: #CBD5E1;
  --shadow:      0 1px 4px rgba(0,0,0,.1);
}
[data-preset="calm"][data-theme="dark"] {
  --bg:          #0F172A;
  --bg2:         #1A2438;
  --surface:     #1E2D3D;
  --border:      #2A3D52;
  --text:        #E2EAF2;
  --text2:       #7A90A8;
  --accent:      #2DD4BF;
  --accent2:     #2DD4BF;
  --accent-text: #0F172A;
  --m-unknown:   #1E2D3D;
  --m-learning:  #D97706;
  --m-familiar:  #38BDF8;
  --m-mastered:  #10B981;
  --m-unknown-t: #7A90A8;
  --m-learning-t:#0F172A;
  --m-familiar-t:#0F172A;
  --m-mastered-t:#0F172A;
  --progress-bg: #2A3D52;
  --shadow:      0 1px 4px rgba(0,0,0,.4);
}

/* --- Playful light --- */
[data-preset="playful"][data-theme="light"] {
  --bg:          #FAF5FF;
  --bg2:         #F3E8FF;
  --surface:     #FFFFFF;
  --border:      #DDD6FE;
  --text:        #1E1B2E;
  --text2:       #6D5F8A;
  --accent:      #7C3AED;
  --accent2:     #EC4899;
  --accent-text: #FFFFFF;
  --m-unknown:   #FAF5FF;
  --m-learning:  #FB923C;
  --m-familiar:  #60A5FA;
  --m-mastered:  #34D399;
  --m-unknown-t: #6D5F8A;
  --m-learning-t:#1E1B2E;
  --m-familiar-t:#1E1B2E;
  --m-mastered-t:#1E1B2E;
  --progress-bg: #DDD6FE;
  --shadow:      0 1px 4px rgba(0,0,0,.1);
}
[data-preset="playful"][data-theme="dark"] {
  --bg:          #1E1B2E;
  --bg2:         #2A2540;
  --surface:     #302A48;
  --border:      #4A3F6A;
  --text:        #F3E8FF;
  --text2:       #A890C8;
  --accent:      #C084FC;
  --accent2:     #F472B6;
  --accent-text: #1E1B2E;
  --m-unknown:   #302A48;
  --m-learning:  #FB923C;
  --m-familiar:  #60A5FA;
  --m-mastered:  #34D399;
  --m-unknown-t: #A890C8;
  --m-learning-t:#1E1B2E;
  --m-familiar-t:#1E1B2E;
  --m-mastered-t:#1E1B2E;
  --progress-bg: #4A3F6A;
  --shadow:      0 1px 4px rgba(0,0,0,.4);
}

/* ===== GLOBAL TOKENS ===== */
body {
  background: var(--bg);
  color: var(--text);
}

/* ===== NAVBAR ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 0 1rem;
  display: flex; align-items: center; gap: .75rem;
  height: 52px;
}
.navbar-logo { font-weight: 700; font-size: 1.1rem; color: var(--accent); }
.navbar-logo:hover { opacity: .85; }
.navbar-links { display: flex; gap: .5rem; align-items: center; }
.navbar-links a, .navbar-links button {
  color: var(--text2); background: none; padding: .3rem .55rem;
  border-radius: 6px; font-size: .9rem; transition: background .15s, color .15s;
}
.navbar-links a:hover, .navbar-links button:hover { background: var(--bg2); color: var(--text); }
.navbar-links a.active { color: var(--accent); font-weight: 600; }

/* Decks dropdown */
.dropdown { position: relative; }
.dropdown-menu {
  display: none; position: absolute; top: calc(100% + 4px); left: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; min-width: 160px; box-shadow: var(--shadow);
  z-index: 200;
}
.dropdown.open .dropdown-menu { display: block; }
.dropdown-menu a {
  display: block; padding: .5rem .85rem; color: var(--text2);
  font-size: .88rem; transition: background .12s;
}
.dropdown-menu a:hover { background: var(--bg2); color: var(--text); }

.navbar-right { margin-left: auto; display: flex; align-items: center; gap: .5rem; }

/* Overall progress in navbar */
.nav-progress { display: flex; align-items: center; gap: .4rem; font-size: .8rem; color: var(--text2); }
.nav-score { font-variant-numeric: tabular-nums; white-space: nowrap; }
.nav-progress-bar { width: 80px; height: 6px; background: var(--progress-bg); border-radius: 3px; overflow: hidden; }
.nav-progress-fill { height: 100%; background: var(--m-mastered); border-radius: 3px; transition: width .3s; }

/* Save indicator */
.save-indicator { font-size: .82rem; padding: .25rem .5rem; border-radius: 6px; cursor: pointer;
  background: none; color: var(--text2); border: 1px solid transparent; transition: all .15s; }
.save-indicator.unsaved { color: #E07B20; border-color: #E07B20; background: rgba(224,123,32,.08); }
.save-indicator:hover { background: var(--bg2); }

/* Theme toggle */
.theme-toggle { background: none; color: var(--text2); padding: .3rem .4rem; border-radius: 6px;
  font-size: 1rem; transition: background .15s; }
.theme-toggle:hover { background: var(--bg2); }

/* Hamburger */
.hamburger { display: none; background: none; color: var(--text); font-size: 1.3rem;
  padding: .25rem .4rem; border-radius: 6px; }
.hamburger:hover { background: var(--bg2); }
.mobile-menu {
  display: none; flex-direction: column; background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: .5rem 1rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: .5rem 0; color: var(--text); font-size: 1rem; }

@media (max-width: 640px) {
  .navbar-links, .nav-progress { display: none; }
  .hamburger { display: block; }
}

/* Focus mode navbar */
.navbar-focus {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: .75rem;
  padding: 0 1rem; height: 48px; font-size: .9rem;
}
.navbar-focus .exit-link {
  color: #fff; font-weight: 700; font-size: .82rem; letter-spacing: .02em;
  background: #C0392B; border: none;
  border-radius: 4px; padding: .35rem .9rem;
  transition: background .15s, opacity .15s;
  white-space: nowrap;
}
.navbar-focus .exit-link:hover { background: #A93226; }
.navbar-focus .focus-info { color: var(--text2); }
.navbar-focus .focus-progress-bar { width: 60px; height: 5px; background: var(--progress-bg); border-radius: 3px; overflow: hidden; }
.navbar-focus .focus-progress-fill { height: 100%; background: var(--m-mastered); border-radius: 3px; }
.navbar-focus .spacer { flex: 1; }

/* ===== LAYOUT ===== */
.page { max-width: 900px; margin: 0 auto; padding: 1.5rem 1rem .25rem; }
.page-wide { max-width: 1100px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }

/* ===== PROGRESS BAR ===== */
.progress-bar { height: 10px; background: var(--progress-bg); border-radius: 5px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 5px; background: var(--m-mastered); transition: width .4s; }
.progress-label { font-size: .82rem; color: var(--text2); margin-top: .3rem; }

/* Label row sitting just above a progress bar, right-aligned */
.progress-bar-header {
  display: flex; justify-content: flex-end;
  margin-bottom: .2rem; font-variant-numeric: tabular-nums;
}

/* multi-color mastery bar */
.mastery-bar { height: 10px; border-radius: 5px; overflow: hidden; display: flex; }
.mastery-bar-seg { height: 100%; transition: width .4s; }
.mastery-bar-seg.unknown  { background: var(--progress-bg); }
.mastery-bar-seg.learning { background: var(--m-learning); }
.mastery-bar-seg.familiar { background: var(--m-familiar); }
.mastery-bar-seg.mastered { background: var(--m-mastered); }

/* ===== HOME PAGE ===== */
.home-hero { margin-bottom: 2rem; }
.home-hero h1 { font-size: 1.5rem; margin-bottom: .5rem; }
.deck-list { display: grid; gap: .75rem; }
.deck-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 1rem 1.25rem;
  cursor: pointer; transition: box-shadow .15s, transform .1s;
  display: flex; align-items: center; gap: 1rem;
}
.deck-card:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.deck-card-icon { font-size: 1.6rem; }
.deck-card-info { flex: 1; min-width: 0; }
.deck-card-name { font-weight: 600; font-size: 1rem; margin-bottom: .25rem; }
.deck-card-meta { font-size: .8rem; color: var(--text2); margin-bottom: .4rem; }
.deck-card-action { font-size: .85rem; color: var(--accent); font-weight: 600; white-space: nowrap; }

/* ===== DECK PAGE ===== */
.deck-header { margin-bottom: 1.5rem; }
.deck-header h1 { font-size: 1.4rem; margin-bottom: .75rem; }
.deck-summary { font-size: .82rem; color: var(--text2); margin-top: .35rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.deck-summary span { display: flex; align-items: center; gap: .3rem; }
.deck-summary .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot-unknown  { background: var(--progress-bg); border: 1px solid var(--border); }
.dot-learning { background: var(--m-learning); }
.dot-familiar { background: var(--m-familiar); }
.dot-mastered { background: var(--m-mastered); }

.deck-controls { display: flex; gap: .5rem; margin-bottom: 1.25rem; flex-wrap: wrap; align-items: center; }
.btn-primary {
  background: var(--accent); color: var(--accent-text);
  padding: .5rem 1.1rem; border-radius: 8px; font-weight: 600;
  font-size: .9rem; transition: opacity .15s;
}
.btn-primary:hover { opacity: .88; }
.btn-secondary {
  background: var(--bg2); color: var(--text); border: 1px solid var(--border);
  padding: .45rem 1rem; border-radius: 8px; font-size: .9rem; transition: background .15s;
}
.btn-secondary:hover { background: var(--border); }
.btn-sm { padding: .3rem .7rem; font-size: .8rem; border-radius: 6px; }

/* Group sections */
.card-group { margin-bottom: 1.5rem; }
.card-group-title {
  font-size: .78rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text2); font-weight: 600; margin-bottom: .6rem; padding-bottom: .3rem;
  border-bottom: 1px solid var(--border);
}
.card-grid { display: flex; flex-wrap: wrap; gap: .5rem; }

/* Flashcard tile (in grid) */
.card-tile {
  min-width: 62px; padding: .5rem .6rem;
  border-radius: 8px; border: 2px solid transparent;
  cursor: pointer; text-align: center; transition: transform .1s, box-shadow .15s;
  position: relative;
}
.card-tile:hover { transform: scale(1.05); box-shadow: var(--shadow); }
.card-tile.unknown  { background: var(--m-unknown);  border-color: var(--border); color: var(--m-unknown-t); }
.card-tile.learning { background: var(--m-learning); color: var(--m-learning-t); }
.card-tile.familiar { background: var(--m-familiar); color: var(--m-familiar-t); }
.card-tile.mastered { background: var(--m-mastered); color: var(--m-mastered-t); }
.card-tile-jp  { font-size: 1.2rem; font-weight: 700; }
.card-tile-sub { font-size: .65rem; opacity: .8; }

/* Inline flip (deck grid preview) */
.card-tile.flipped .card-tile-jp  { font-size: .8rem; font-weight: 400; }
.card-tile.flipped .card-tile-sub { font-size: .65rem; }

/* Select mode */
.select-active { background: var(--accent) !important; color: var(--accent-text) !important; border-color: var(--accent) !important; }
.card-tile.selectable { cursor: pointer; }
.card-tile.selectable:not(.selected) { opacity: .45; }
.card-tile.selected { box-shadow: 0 0 0 2px var(--accent); opacity: 1 !important; }
.select-check {
  position: absolute; top: 3px; right: 3px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent); color: var(--accent-text);
  font-size: .6rem; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
  line-height: 1;
}

/* Category select-all button (select mode only) */
.cat-select-all {
  margin-left: .5rem; font-size: .7rem; cursor: pointer;
  background: var(--bg2); border: 1px solid var(--border);
  color: var(--text2); border-radius: 4px; padding: .12rem .42rem;
  vertical-align: middle; transition: background .12s;
}
.cat-select-all:hover { background: var(--border); color: var(--text); }
.cat-select-all--hidden { visibility: hidden; pointer-events: none; }

/* Extra bottom padding when action bar is open */
.select-action-bar.visible ~ * { padding-bottom: 80px; }
.select-action-bar.visible + * { padding-bottom: 80px; }

/* Bottom action bar */
.select-action-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 300;
  background: var(--surface); border-top: 2px solid var(--border);
  box-shadow: 0 -4px 20px rgba(0,0,0,.18);
  display: flex; align-items: center; gap: .6rem; flex-wrap: wrap;
  padding: .75rem 1.5rem;
  transform: translateY(100%); transition: transform .22s cubic-bezier(.4,0,.2,1);
}
.select-action-bar.visible { transform: translateY(0); }
.select-count { font-weight: 700; font-size: .92rem; white-space: nowrap; }
.select-divider { width: 1px; height: 20px; background: var(--border); margin: 0 .2rem; }

/* ===== PRACTICE PAGE ===== */
.practice-layout { display: flex; flex-direction: column; align-items: center; padding: 1rem 1rem 2rem; min-height: calc(100vh - 48px); }

/* Flip card outer — arrows flank the card */
.flip-card-outer {
  display: flex; align-items: center; gap: .5rem;
  width: 100%; max-width: 580px;
  margin: .5rem 0 .25rem;
}
.side-nav-btn {
  flex-shrink: 0;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text2);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow);
  transition: background .15s, color .15s, transform .1s, box-shadow .15s;
}
.side-nav-btn:hover {
  background: var(--bg2); color: var(--text);
  transform: scale(1.08);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.side-nav-btn:active { transform: scale(.95); }
.flip-card-outer .flip-card-wrapper { flex: 1; margin: 0; max-width: none; }

/* Counter overlaid at bottom of card */
.card-counter-inner {
  position: absolute; bottom: .6rem; left: 50%;
  transform: translateX(-50%);
  font-size: .72rem; color: var(--text2);
  pointer-events: none; z-index: 2;
}

/* Flip card */
.flip-card-wrapper { width: 100%; max-width: 500px; height: 260px; perspective: 1000px; margin: .5rem 0 1rem; cursor: pointer; position: relative; }
.flip-card-inner { width: 100%; height: 100%; position: relative; transform-style: preserve-3d; transition: transform .35s; }
.flip-card-wrapper.flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-card-face {
  position: absolute; inset: 0; backface-visibility: hidden;
  background: var(--surface); border: 2px solid var(--border);
  border-radius: 16px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: .5rem; padding: 1.5rem;
}
.flip-card-back { transform: rotateY(180deg); }
.card-face-jp   { font-size: 2.8rem; font-weight: 700; line-height: 1.2; }
.card-face-sub  { font-size: 1rem; color: var(--text2); }
.card-face-hint { font-size: .78rem; color: var(--text2); margin-top: .5rem; }
.card-face-answer { font-size: 1.5rem; font-weight: 600; }
.card-face-reading{ font-size: 1rem; color: var(--text2); }
.card-face-example{ font-size: .82rem; color: var(--text2); font-style: italic; text-align: center; max-width: 360px; }
.flip-hint { font-size: .75rem; color: var(--text2); text-align: center; margin-bottom: 1rem; }
.flip-hint kbd {
  font-family: inherit; font-size: .68rem;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 4px; padding: .05rem .35rem;
  color: var(--text2); vertical-align: middle;
}

/* nav buttons */
.practice-nav { display: flex; align-items: center; gap: .75rem; margin-bottom: 1rem; }
.practice-nav .nav-btn {
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); border-radius: 50%; width: 40px; height: 40px;
  font-size: 1.1rem; display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.practice-nav .nav-btn:hover { background: var(--bg2); }
.practice-nav .card-counter { color: var(--text2); font-size: .9rem; min-width: 60px; text-align: center; }

/* Practice section divider */
.practice-divider {
  width: 100%; max-width: 500px;
  display: flex; align-items: center; gap: .6rem;
  font-size: .68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .06em; color: var(--text2);
  margin: .9rem 0 .5rem;
}
.practice-divider::before,
.practice-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

/* Verdict below MCQ grid gets extra breathing room */
.mcq-grid + .answer-result { margin-top: .9rem; }
/* Textbox in type mode gets top gap from the hint row */
.answer-check { margin-top: .75rem; }

/* MCQ options grid */
.mcq-grid {
  width: 100%; max-width: 500px;
  display: grid; grid-template-columns: 1fr 1fr; gap: .4rem;
}
/* Kana reverse mode — larger characters so similar kana are easy to distinguish */
.mcq-grid--kana .mcq-btn { font-size: 1.5rem; padding: .65rem .5rem; }
.mcq-grid--kana .mcq-letter { font-size: .65rem; }
.mcq-btn {
  display: flex; align-items: center; gap: .5rem;
  padding: .55rem .7rem; border-radius: 8px; text-align: left;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); font-size: .85rem; cursor: pointer;
  transition: background .12s, border-color .12s;
}
.mcq-btn:hover:not(:disabled) { background: var(--bg2); border-color: var(--accent); }
.mcq-btn:disabled { cursor: default; }
.mcq-btn.correct { background: var(--m-mastered); color: var(--m-mastered-t); border-color: var(--m-mastered); }
.mcq-btn.wrong   { background: #C0392B; color: #fff; border-color: #C0392B; }
.mcq-letter {
  font-size: .7rem; font-weight: 700; color: var(--text2);
  background: var(--bg2); border-radius: 4px;
  padding: .1rem .3rem; flex-shrink: 0;
}
.mcq-btn.correct .mcq-letter,
.mcq-btn.wrong   .mcq-letter { background: rgba(255,255,255,.2); color: inherit; }

/* Mastery buttons */
.mastery-buttons { display: flex; gap: .5rem; flex-wrap: wrap; justify-content: center; margin-top: 1.1rem; margin-bottom: 1.25rem; }
.mastery-btn {
  padding: .45rem .9rem; border-radius: 8px; font-size: .88rem; font-weight: 600;
  border: 2px solid transparent; transition: opacity .15s, transform .1s;
  opacity: .55;
}
.mastery-btn:hover { opacity: .85; transform: scale(1.04); }
.mastery-btn.active { opacity: 1; box-shadow: 0 0 0 2px var(--text); }
.mastery-btn.unknown  { background: var(--m-unknown);  color: var(--m-unknown-t);  border-color: var(--border); }
.mastery-btn.learning { background: var(--m-learning); color: var(--m-learning-t); }
.mastery-btn.familiar { background: var(--m-familiar); color: var(--m-familiar-t); }
.mastery-btn.mastered { background: var(--m-mastered); color: var(--m-mastered-t); }

/* Answer check */
.answer-check { width: 100%; max-width: 480px; display: flex; gap: .5rem; margin-bottom: .75rem; }
.answer-check input {
  flex: 1; padding: .45rem .75rem; border: 1px solid var(--border);
  border-radius: 8px; background: var(--surface); color: var(--text);
  font-size: .9rem; outline: none; transition: border .15s;
}
.answer-check input:focus { border-color: var(--accent); }
.answer-check input.correct { border-color: var(--m-mastered); background: rgba(91,140,81,.08); }
.answer-check input.wrong   { border-color: #E05050; background: rgba(224,80,80,.06); }
.answer-check-disabled { opacity: .45; }
.answer-check-disabled input,
.answer-check-disabled button { cursor: not-allowed; }
.answer-check-disabled input { background: var(--bg2); font-style: italic; }
.answer-result { font-size: .8rem; color: var(--text2); text-align: center; min-height: 1.2em; }
.answer-result.correct { color: var(--m-mastered); }
.answer-result.wrong   { color: #E05050; }

/* Practice filter row */
.filter-row { display: flex; gap: .4rem; flex-wrap: wrap; align-items: center; }
.filter-label { font-size: .78rem; color: var(--text2); }
.filter-btn {
  padding: .28rem .6rem; border-radius: 6px; font-size: .78rem;
  background: var(--bg2); color: var(--text); border: 1px solid var(--border);
  transition: background .12s;
}
.filter-btn:hover { background: var(--border); }
.filter-btn.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.toggle-btn {
  padding: .28rem .6rem; border-radius: 6px; font-size: .78rem;
  background: var(--bg2); color: var(--text); border: 1px solid var(--border);
  transition: background .12s;
}
.toggle-btn.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

/* Button group — shared edges (segmented control) */
.btn-group { display: inline-flex; }
.btn-group > button {
  border-radius: 0;
  margin-left: -1px;
  position: relative;
}
.btn-group > button:first-child { 
  @media only screen and (min-width: 340px) {
    border-radius: 6px 0 0 6px; margin-left: 0; 
  }
}
.btn-group > button:last-child  { 
    @media only screen and (min-width: 340px) {
        border-radius: 0 6px 6px 0; 
    }
}
.btn-group > button.active,
.btn-group > button.on { z-index: 1; }

.btn-group {
  @media only screen and (max-width: 340px) {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
  }
}

.btn-group > button {
  @media only screen and (max-width: 340px) {
    border-radius: 6px;
  }
}

/* Controls block — same width as flashcard so left edges align */
.practice-controls-block {
  width: 100%; max-width: 580px; /* match flip-card-outer */
  padding-left: calc(44px + .5rem); /* align labels with card left edge */
  display: flex; flex-direction: column; gap: .4rem;
  margin-bottom: .5rem;
}
/* On narrow screens: drop the indent so labels start at the left icon edge */
@media (max-width: 600px) {
  .practice-controls-block { padding-left: 0; }
  .controls-label { min-width: 6rem; }
  .flip-hint { display: none; }
  .answer-check { margin-top: 1.5rem; }           /* type mode: gap below card */
  .practice-divider--answer { margin-top: 1.5rem; } /* mcq mode: gap below card */
}
.practice-controls-row {
  display: flex; align-items: center; gap: .6rem; flex-wrap: wrap;
}
/* Settings toggle button group — wraps independently from the label */
.settings-controls { display: flex; flex-wrap: wrap; gap: .5rem; }

.controls-label {
  min-width: 8.5rem; flex-shrink: 0;
  font-size: .7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--text2); white-space: nowrap;
}

/* Kana category row: label + All on first line, grouped panel indented below */
.cat-with-all-row { flex-direction: column !important; align-items: flex-start !important; }
.cat-all-line { display: flex; align-items: center; gap: .6rem; }

.cat-with-all-row {
  @media only screen and (max-width: 340px) {
    margin-top: 12px;
  }
}

/* Kana grouped category panel */
.kana-cat-panel { display: flex; flex-direction: column; gap: .5rem; }
.cat-group-section { display: flex; align-items: flex-start; gap: .4rem; }
.cat-group-chips { display: flex; flex-wrap: wrap; gap: .3rem; flex: 1; }
.cat-group-label {
  font-size: .68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .05em; color: var(--text2); white-space: nowrap;
  padding-top: .25rem; flex-shrink: 0;
}
.chip-sm { padding: .18rem .5rem !important; font-size: .72rem !important; }

/* Chip / pill group — wraps freely, no shared edges */
.chip-group { display: flex; flex-wrap: wrap; gap: .35rem; }
.chip {
  padding: .25rem .65rem; border-radius: 999px;
  font-size: .78rem; font-weight: 500;
  background: var(--bg2); color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer; transition: background .12s, border-color .12s, color .12s;
  white-space: nowrap;
}
.chip:hover { background: var(--border); }
.chip.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

/* Selection-mode practice notice */
.selection-notice {
  font-size: .8rem; color: var(--text2);
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 8px; padding: .4rem .75rem;
  margin-right: calc(44px + .5rem); /* align right edge with flashcard */
}
.selection-notice strong { color: var(--text); }
@media (max-width: 600px) {
  .selection-notice { margin-right: 0; } /* full width between the two icons on mobile */
}

/* Empty state */
.empty-state { text-align: center; color: var(--text2); padding: 2rem; font-size: .95rem; }

/* ===== CALENDAR PAGE ===== */
.calendar-section { margin-bottom: 2rem; }
.calendar-section h2 { font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; }
.heatmap-grid { display: flex; gap: 3px; overflow-x: auto; padding-bottom: .5rem; }
.heatmap-col { display: flex; flex-direction: column; gap: 3px; }
.heatmap-cell {
  width: 13px; height: 13px; border-radius: 2px;
  background: var(--progress-bg);
}
.heatmap-cell.active-0 { background: var(--progress-bg); opacity: .6; }
.heatmap-cell.active-1 { background: var(--m-mastered); opacity: .25; }
.heatmap-cell.active-2 { background: var(--m-mastered); opacity: .5; }
.heatmap-cell.active-3 { background: var(--m-mastered); opacity: .75; }
.heatmap-cell.active-4 { background: var(--m-mastered); opacity: 1; }
.heatmap-labels { display: flex; gap: 3px; }
.heatmap-month-labels { display: flex; font-size: .68rem; color: var(--text2); gap: 0; margin-bottom: .3rem; }
.heatmap-day-labels { display: flex; flex-direction: column; gap: 3px; font-size: .65rem; color: var(--text2); margin-right: .3rem; }

.session-summary { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; }
.session-summary h3 { font-size: 1rem; font-weight: 600; margin-bottom: .75rem; }
.session-stat { display: flex; justify-content: space-between; align-items: center;
  padding: .4rem 0; border-bottom: 1px solid var(--border); font-size: .88rem; }
.session-stat:last-child { border-bottom: none; }
.session-stat-val { font-weight: 600; color: var(--accent); }
.moves-list { margin-top: .75rem; display: flex; flex-direction: column; gap: .3rem; }
.move-item { font-size: .8rem; display: flex; gap: .5rem; align-items: center; color: var(--text2); }
.move-badge { padding: .1rem .4rem; border-radius: 4px; font-size: .72rem; font-weight: 600; }
.move-badge.learning { background: var(--m-learning); color: var(--m-learning-t); }
.move-badge.familiar { background: var(--m-familiar); color: var(--m-familiar-t); }
.move-badge.mastered { background: var(--m-mastered); color: var(--m-mastered-t); }
.move-badge.unknown  { background: var(--progress-bg); color: var(--text2); }

/* ===== SETTINGS PAGE ===== */
.settings-section { margin-bottom: 2rem; }
.settings-section h2 { font-size: 1.05rem; font-weight: 600; margin-bottom: 1rem; }
.setting-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 0; border-bottom: 1px solid var(--border);
  gap: 1rem; flex-wrap: wrap;
}
.setting-row:last-child { border-bottom: none; }
.setting-label { font-size: .92rem; }
.setting-desc  { font-size: .78rem; color: var(--text2); }
.setting-control { display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; }

/* Preset selector */
.preset-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: .5rem; margin-top: .5rem; }
.preset-btn {
  padding: .55rem .75rem; border-radius: 8px; border: 2px solid var(--border);
  background: var(--surface); color: var(--text); font-size: .85rem;
  text-align: left; transition: border-color .15s;
}
.preset-btn.active { border-color: var(--accent); }
.preset-swatch { width: 12px; height: 12px; border-radius: 50%; display: inline-block; margin-right: .4rem; vertical-align: middle; }

/* Export/import */
.export-row { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }
.btn-danger {
  background: none; border: 1px solid #E05050; color: #E05050;
  padding: .4rem .85rem; border-radius: 8px; font-size: .85rem; transition: background .15s;
}
.btn-danger:hover { background: rgba(224,80,80,.08); }


/* ===== TOAST ===== */
.app-toast {
  position: fixed; bottom: 1.5rem; left: 50%;
  transform: translateX(-50%) translateY(150%);
  padding: .65rem 1.3rem; border-radius: 10px;
  font-size: .88rem; font-weight: 600; line-height: 1.5;
  box-shadow: 0 4px 16px rgba(0,0,0,.22);
  z-index: 600; pointer-events: none;
  max-width: 90vw; text-align: center;
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.app-toast-visible { transform: translateX(-50%) translateY(0); }
.app-toast-success { background: #2E7D32; color: #fff; }
.app-toast-error   { background: #C0392B; color: #fff; }
.app-toast-warn    { background: #B45309; color: #fff; }

/* ===== HOME FOOTER ===== */
.home-footer {
  margin-top: 1.5rem; padding: .3rem 0 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: .7rem; color: var(--text2);
  letter-spacing: .02em;
}
.home-footer a { color: var(--text2); text-decoration: underline; text-underline-offset: 2px; }
.home-footer a:hover { color: var(--text); }

/* ===== UTILITIES ===== */
.flex { display: flex; }
.gap-sm { gap: .4rem; }
.gap-md { gap: .75rem; }
.mt-sm { margin-top: .5rem; }
.mt-md { margin-top: 1rem; }
.mt-lg { margin-top: 1.5rem; }
.text-muted { color: var(--text2); }
.text-sm { font-size: .85rem; }
.fw-600 { font-weight: 600; }
.hidden { display: none !important; }