/* ================================================================
   VOCABULARY PROGRAMME — SHARED STYLES  v3.0
   ================================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:    #0b0b10;
  --bg2:   #12121a;
  --bg3:   #1c1c28;
  --line:  #2a2a3a;
  --text:  #f0f0f8;
  --text2: #b8b8d4;
  --text3: #505078;
  --gold:  #d4a843;
  --gold2: #f0c96a;
  --accent:  #7b6cff;
  --accent2: #b5abff;
  --badge-noun:        #6b9fff;
  --badge-noun-bg:     rgba(107,159,255,.12);
  --badge-noun-border: rgba(107,159,255,.3);
  --badge-verb:        #5ec4a0;
  --badge-verb-bg:     rgba(94,196,160,.12);
  --badge-verb-border: rgba(94,196,160,.3);
  --badge-adj:         #e0a458;
  --badge-adj-bg:      rgba(224,164,88,.12);
  --badge-adj-border:  rgba(224,164,88,.3);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
}

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── HOME STRIP ─────────────────────────────────────────────── */
.home-strip {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .55rem 2.5rem;
  background: rgba(11,11,16,.96);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 200;
  backdrop-filter: blur(10px);
}
.home-strip a {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--text2);
  text-decoration: none;
  padding: .3rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: all .2s;
}
.home-strip a:hover {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(212,168,67,.08);
}
.home-strip .strip-series-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .1em;
  margin-left: auto;
}

/* ── APP HEADER ─────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2.5rem;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 36px;
  z-index: 100;
  background: rgba(11,11,16,.94);
  backdrop-filter: blur(12px);
}
.logo { display: flex; align-items: baseline; gap: .6rem; }
.logo-num {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--gold);
  letter-spacing: .15em;
}
.logo-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--text2);
  letter-spacing: .04em;
}
.nav-controls { display: flex; align-items: center; gap: .8rem; }
.progress-label {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--text2);
  letter-spacing: .12em;
}
.nav-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--line);
  background: var(--bg2);
  color: var(--text);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  transition: all .2s;
  font-size: 14px;
}
.nav-btn:hover:not(:disabled) { border-color: var(--gold); color: var(--gold); background: rgba(212,168,67,.08); }
.nav-btn:disabled { opacity: .3; cursor: not-allowed; }

/* ── SR HEADER BADGE ────────────────────────────────────────── */
.sr-header-badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .08em;
  padding: .25rem .7rem;
  border-radius: 3px;
  background: rgba(212,168,67,.15);
  border: 1px solid rgba(212,168,67,.35);
  color: var(--gold);
  white-space: nowrap;
}

/* ── PROGRESS BAR ───────────────────────────────────────────── */
.progress-track {
  height: 2px;
  background: var(--line);
  position: sticky;
  top: calc(36px + 62px);
  z-index: 99;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transition: width .4s ease;
}

/* ── PAGES ──────────────────────────────────────────────────── */
.page {
  display: none;
  min-height: calc(100vh - 110px);
  padding: 2.5rem 2.5rem 5rem;
  max-width: 1100px;
  margin: 0 auto;
  animation: fadeIn .3s ease;
}
.page.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── CLUSTER META ───────────────────────────────────────────── */
.cluster-meta {
  display: flex;
  align-items: flex-end;
  gap: 1.4rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--line);
}
.cluster-day {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--gold);
  letter-spacing: .2em;
  text-transform: uppercase;
  background: rgba(212,168,67,.1);
  border: 1px solid rgba(212,168,67,.25);
  padding: 4px 12px;
  border-radius: 2px;
  white-space: nowrap;
  flex-shrink: 0;
  align-self: center;
}
.cluster-theme {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1.7rem,4vw,2.6rem);
  font-weight: 300;
  font-style: italic;
  color: var(--text);
  line-height: 1.1;
}
.cluster-count {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text2);
  letter-spacing: .1em;
  align-self: center;
  margin-left: auto;
  flex-shrink: 0;
}

/* ── WORD GRID ──────────────────────────────────────────────── */
.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px,1fr));
  gap: 1.1rem;
}
.word-card {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.4rem 1.5rem 1.5rem;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  cursor: default;
}
.word-card:hover {
  border-color: rgba(123,108,255,.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,.35);
}
.card-header {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-bottom: .3rem;
  flex-wrap: wrap;
}
.word-name {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: #f4f4fd;
  letter-spacing: .01em;
  line-height: 1;
}
.pos-badge {
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 3px;
  line-height: 1;
  flex-shrink: 0;
  white-space: nowrap;
}
.pos-badge.noun  { color: var(--badge-noun);  background: var(--badge-noun-bg);  border: 1px solid var(--badge-noun-border); }
.pos-badge.verb  { color: var(--badge-verb);  background: var(--badge-verb-bg);  border: 1px solid var(--badge-verb-border); }
.pos-badge.adj   { color: var(--badge-adj);   background: var(--badge-adj-bg);   border: 1px solid var(--badge-adj-border); }
.pos-badge.adv   { color: #c4a0ff; background: rgba(196,160,255,.12); border: 1px solid rgba(196,160,255,.3); }

.word-def {
  font-size: 11px;
  font-weight: 400;
  color: var(--gold2);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-family: 'DM Mono', monospace;
}
.when-list { display: flex; flex-direction: column; gap: .5rem; }
.when-item {
  font-family: 'Cormorant Garamond', serif;
  font-size: .98rem;
  color: #e0e0f4;
  line-height: 1.55;
  padding-left: 1rem;
  border-left: 2px solid var(--line);
  transition: border-color .2s, color .2s;
}
.word-card:hover .when-item { border-left-color: var(--accent); color: #f0f0ff; }
.when-item strong { font-style: normal; font-weight: 700; color: var(--accent2); }

/* ── SLIDE ACTION BAR ───────────────────────────────────────── */
.slide-action-bar {
  display: flex;
  align-items: center;
  gap: .8rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
  padding: 1.2rem 1.4rem;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color .2s;
}
.slide-action-bar.shake {
  animation: shake .5s ease;
  border-color: #e05252;
}
@keyframes shake {
  0%,100%{ transform:translateX(0); }
  20%    { transform:translateX(-6px); }
  40%    { transform:translateX(6px); }
  60%    { transform:translateX(-4px); }
  80%    { transform:translateX(4px); }
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .55rem 1.3rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.action-btn svg { width: 14px; height: 14px; flex-shrink: 0; }
.fc-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(123,108,255,.1); }
.quiz-btn { background: var(--gold); color: #0b0b10; border-color: var(--gold); }
.quiz-btn:hover { background: var(--gold2); border-color: var(--gold2); }
.quiz-btn.quiz-passed { background: rgba(94,196,160,.15); color: var(--badge-verb); border-color: var(--badge-verb-border); }
.quiz-btn.quiz-passed:hover { background: rgba(94,196,160,.25); }

.quiz-status-badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .08em;
  padding: .28rem .65rem;
  border-radius: 3px;
}
.quiz-status-badge.passed  { color: var(--badge-verb); background: var(--badge-verb-bg); border: 1px solid var(--badge-verb-border); }
.quiz-status-badge.pending { color: var(--text3); }

/* ── SR DUE BADGE (in action bar) ──────────────────────────── */
.sr-due-badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .08em;
  padding: .28rem .65rem;
  border-radius: 3px;
  background: rgba(212,168,67,.12);
  border: 1px solid rgba(212,168,67,.3);
  color: var(--gold);
  margin-left: auto;
}

/* ── BOTTOM NAV ─────────────────────────────────────────────── */
.bottom-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.3rem 2.5rem;
  border-top: 1px solid var(--line);
  max-width: 1100px;
  margin: 0 auto;
}
.btn-prev, .btn-next {
  font-family: 'Syne', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .62rem 1.5rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all .2s;
  display: flex; align-items: center; gap: .5rem;
}
.btn-next { background: var(--gold); color: #0b0b10; border-color: var(--gold); }
.btn-prev:hover:not(:disabled) { border-color: var(--text2); color: #fff; }
.btn-next:hover:not(:disabled) { background: var(--gold2); border-color: var(--gold2); }
.btn-next.next-blocked { background: var(--bg3); color: var(--text3); border-color: var(--line); }
.btn-prev:disabled, .btn-next:disabled { opacity: .3; cursor: not-allowed; }

/* ── DOT NAV ────────────────────────────────────────────────── */
.dot-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 320px;
}
.dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--line);
  cursor: pointer;
  transition: background .2s, transform .15s, box-shadow .2s;
  position: relative;
}
.dot.active         { background: var(--gold); transform: scale(1.5); }
.dot.passed         { background: var(--badge-verb); }
.dot.due            { background: var(--gold); box-shadow: 0 0 0 2px rgba(212,168,67,.35); }
.dot.active.passed  { background: var(--gold); }
.dot:hover          { background: var(--text2); }

/* ── TOAST ──────────────────────────────────────────────────── */
.vocab-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  padding: .72rem 1.4rem;
  border-radius: var(--radius-md);
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  letter-spacing: .05em;
  max-width: 90vw;
  text-align: center;
  z-index: 9999;
  opacity: 0;
  transition: opacity .25s, transform .25s;
  pointer-events: none;
}
.vocab-toast--show    { opacity: 1; transform: translateX(-50%) translateY(0); }
.vocab-toast--info    { background: var(--bg3); border: 1px solid var(--line); color: var(--text2); }
.vocab-toast--warning { background: rgba(224,82,82,.12); border: 1px solid rgba(224,82,82,.4); color: #e05252; }
.vocab-toast--success { background: rgba(94,196,160,.12); border: 1px solid rgba(94,196,160,.4); color: var(--badge-verb); }

/* ═══════════════════════════════════════════════════════════════
   WEAK WORDS PANEL
   ═══════════════════════════════════════════════════════════════ */
.weak-panel {
  max-width: 1100px;
  margin: 0 auto 1.4rem;
  padding: 1.3rem 1.5rem;
  background: var(--bg2);
  border: 1px solid rgba(224,164,88,.25);
  border-radius: var(--radius-md);
}
.weak-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: .4rem;
}
.weak-title {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--badge-adj);
}
.weak-sub {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .08em;
}
.weak-list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: 1.1rem;
}
.weak-item {
  display: grid;
  grid-template-columns: 1fr 80px 140px;
  align-items: center;
  gap: .8rem;
}
.weak-word {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}
.weak-stat {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .06em;
  text-align: right;
}
.weak-bar {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.weak-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--badge-adj), #e05252);
  border-radius: 2px;
  transition: width .4s ease;
}
.weak-quiz-btn {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .55rem 1.3rem;
  background: transparent;
  border: 1px solid var(--badge-adj-border);
  color: var(--badge-adj);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .2s;
}
.weak-quiz-btn:hover { background: var(--badge-adj-bg); }

/* ═══════════════════════════════════════════════════════════════
   QUIZ OVERLAY
   ═══════════════════════════════════════════════════════════════ */
.quiz-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8,8,14,.92);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: overlayIn .2s ease;
}
@keyframes overlayIn { from { opacity:0; } to { opacity:1; } }

.quiz-panel {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 580px;
  max-height: 92vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  animation: panelIn .25s ease;
}
@keyframes panelIn {
  from { opacity:0; transform:scale(.96) translateY(10px); }
  to   { opacity:1; transform:scale(1) translateY(0); }
}

.quiz-header {
  padding: 1.3rem 1.5rem .9rem;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg2);
  z-index: 2;
}
.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: .65rem;
}
.quiz-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--gold);
  letter-spacing: .15em;
  text-transform: uppercase;
}
.quiz-counter {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: var(--text2);
}
.quiz-progress-bar {
  height: 3px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: .55rem;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg,var(--accent),var(--gold));
  transition: width .3s ease;
}
.quiz-score-live {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .08em;
}

.quiz-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.quiz-question {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.5;
  white-space: pre-line;
}
.quiz-options { display: flex; flex-direction: column; gap: .5rem; }
.quiz-option {
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text2);
  font-family: 'Syne', sans-serif;
  font-size: 13px;
  padding: .75rem 1.1rem;
  text-align: left;
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.quiz-option:hover:not(:disabled) { border-color: var(--accent); background: rgba(123,108,255,.1); color: var(--text); }
.quiz-option:disabled { cursor: default; }
.quiz-option.correct  { border-color: var(--badge-verb); background: var(--badge-verb-bg); color: var(--badge-verb); }
.quiz-option.wrong    { border-color: #e05252; background: rgba(224,82,82,.1); color: #e05252; }
.opt-icon { font-size: 14px; }

.quiz-next-btn {
  margin-top: .35rem;
  align-self: flex-end;
  font-family: 'Syne', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .6rem 1.5rem;
  background: var(--gold);
  color: #0b0b10;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .2s;
}
.quiz-next-btn:hover { background: var(--gold2); }

/* ── Results ── */
.quiz-results {
  align-items: center;
  padding: 2.4rem 1.5rem;
  gap: 1.1rem;
}
.results-ring { position: relative; width: 120px; height: 120px; }
.ring-svg { transform: rotate(-90deg); width: 100%; height: 100%; }
.ring-track { fill: none; stroke: var(--line); stroke-width: 8; }
.ring-fill  { fill: none; stroke-width: 8; stroke-linecap: round; transition: stroke-dasharray .6s ease; }
.ring-inner {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.ring-score { font-family: 'DM Mono', monospace; font-size: 1.1rem; font-weight: 500; color: var(--text); }
.ring-grade { font-family: 'DM Mono', monospace; font-size: 9px; letter-spacing: .12em; text-transform: uppercase; }

.results-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
}
.results-sub {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1rem;
  color: var(--text2);
  text-align: center;
  max-width: 380px;
  line-height: 1.5;
}
.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  justify-content: center;
}
.res-btn {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .55rem 1.3rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text2);
  transition: all .2s;
}
.res-retry { border-color: var(--accent); color: var(--accent); }
.res-retry:hover { background: rgba(123,108,255,.15); }
.res-next  { background: var(--gold); color: #0b0b10; border-color: var(--gold); }
.res-next:hover { background: var(--gold2); border-color: var(--gold2); }
.res-fc:hover  { border-color: var(--text2); color: var(--text); }
.res-close:hover { border-color: var(--text3); color: var(--text3); }

.results-sr-note {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--text3);
  text-align: center;
  padding: .5rem 1rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg3);
}
.results-sr-note strong { color: var(--gold); }

/* ═══════════════════════════════════════════════════════════════
   FLASHCARD OVERLAY
   ═══════════════════════════════════════════════════════════════ */
.fc-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8,8,14,.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: overlayIn .2s ease;
}
.fc-panel {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  animation: panelIn .25s ease;
  overflow: hidden;
}
.fc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.3rem;
  border-bottom: 1px solid var(--line);
}
.fc-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--gold);
  letter-spacing: .15em;
  text-transform: uppercase;
}
.fc-counter {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--text2);
}
.fc-close-btn {
  width: 28px; height: 28px;
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text2);
  font-size: 12px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
}
.fc-close-btn:hover { border-color: var(--text2); color: var(--text); }

.fc-progress-bar { height: 2px; background: var(--line); }
.fc-progress-fill {
  height: 100%;
  background: linear-gradient(90deg,var(--accent),var(--gold));
  transition: width .3s ease;
}

.fc-scene {
  padding: 1.6rem 1.4rem 1.2rem;
  perspective: 1200px;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fc-card {
  width: 100%;
  max-width: 460px;
  min-height: 195px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .55s cubic-bezier(.4,0,.2,1);
  cursor: pointer;
  outline: none;
}
.fc-card.is-flipped { transform: rotateY(180deg); }
.fc-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.6rem 1.4rem;
  gap: .6rem;
  text-align: center;
  transition: border-color .2s;
}
.fc-card:hover .fc-face,
.fc-card:focus .fc-face { border-color: rgba(123,108,255,.4); }
.fc-back { transform: rotateY(180deg); justify-content: flex-start; overflow-y: auto; }
.fc-face-label {
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text3);
}
.fc-word-name {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2.3rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
}
.fc-def-text {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--gold2);
  margin-bottom: .25rem;
}
.fc-tap-hint {
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  letter-spacing: .12em;
  color: var(--text3);
  text-transform: uppercase;
  margin-top: .25rem;
}
.fc-whens {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  margin-top: .35rem;
  text-align: left;
  width: 100%;
}
.fc-when {
  font-family: 'Cormorant Garamond', serif;
  font-size: .93rem;
  color: var(--text2);
  line-height: 1.5;
  padding-left: .8rem;
  border-left: 2px solid var(--line);
}
.fc-when strong { color: var(--accent2); font-style: normal; }

.fc-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .7rem;
  padding: .9rem 1.3rem;
  border-top: 1px solid var(--line);
}
.fc-nav-btn {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .5rem 1.1rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .2s;
}
.fc-nav-btn:hover:not(:disabled) { border-color: var(--text2); color: var(--text); }
.fc-nav-btn:disabled { opacity: .3; cursor: not-allowed; }
.fc-flip-btn {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .5rem 1.3rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .2s;
  flex: 1;
  max-width: 200px;
}
.fc-flip-btn:hover { background: #6a5de8; }
.fc-hint {
  padding: .5rem 1.3rem .8rem;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .08em;
  text-align: center;
}
.fc-hint kbd {
  display: inline-block;
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: .1rem .32rem;
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  color: var(--text2);
}

/* ═══════════════════════════════════════════════════════════════
   HOME PAGE
   ═══════════════════════════════════════════════════════════════ */
.home-page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
}
.home-header {
  text-align: center;
  margin-bottom: 3rem;
  max-width: 620px;
}
.logo-num-home {
  font-family: 'DM Mono', monospace;
  font-size: clamp(10px,2.5vw,13px);
  color: var(--gold);
  letter-spacing: .2em;
  text-transform: uppercase;
  display: block;
  margin-bottom: .5rem;
}
.home-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem,6vw,3.8rem);
  font-weight: 300;
  font-style: italic;
  color: var(--text);
  margin-bottom: .5rem;
  line-height: 1.1;
}
.home-subtitle {
  font-family: 'Syne', sans-serif;
  font-size: clamp(.75rem,2vw,.95rem);
  color: var(--text2);
  letter-spacing: .04em;
}

/* ── Overall stats bar on home ── */
.home-stats-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2.5rem;
  padding: .8rem 1.6rem;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  max-width: 700px;
  width: 100%;
}
.home-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
}
.home-stat-value {
  font-family: 'DM Mono', monospace;
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text);
}
.home-stat-label {
  font-family: 'DM Mono', monospace;
  font-size: 9px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text3);
}
.home-stat-divider {
  width: 1px;
  height: 28px;
  background: var(--line);
}
.home-stat.due .home-stat-value { color: var(--gold); }
.home-stat.weak .home-stat-value { color: var(--badge-adj); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
  gap: 1.5rem;
  max-width: 1050px;
  width: 100%;
}
.series-card {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.7rem 1.5rem 2rem;
  transition: transform .25s, border-color .25s, box-shadow .25s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}
.series-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--gold), var(--accent));
  opacity: 0;
  transition: opacity .25s;
}
.series-card:hover { transform: translateY(-6px); border-color: rgba(123,108,255,.5); box-shadow: 0 16px 40px rgba(0,0,0,.4); }
.series-card:hover::before { opacity: 1; }
.series-number {
  font-family: 'DM Mono', monospace;
  font-size: clamp(10px,1.8vw,11px);
  font-weight: 500;
  color: var(--gold);
  letter-spacing: .15em;
  text-transform: uppercase;
  margin-bottom: .8rem;
  display: flex; align-items: center; gap: .5rem;
}
.series-number span {
  background: rgba(212,168,67,.1);
  border: 1px solid rgba(212,168,67,.25);
  padding: 3px 10px;
  border-radius: 4px;
  white-space: nowrap;
}

/* SR due badge on card */
.due-badge {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  letter-spacing: .08em;
  padding: .22rem .6rem;
  border-radius: 3px;
  background: rgba(212,168,67,.12);
  border: 1px solid rgba(212,168,67,.3);
  color: var(--gold);
  margin-left: auto;
  align-self: flex-start;
  flex-shrink: 0;
}

.series-progress-line {
  height: 2px;
  background: var(--line);
  border-radius: 1px;
  margin-bottom: .4rem;
  overflow: hidden;
}
.series-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transition: width .4s ease;
}
.series-progress-label {
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: .08em;
  margin-bottom: .8rem;
}
.series-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1.4rem,4vw,1.75rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: .55rem;
  line-height: 1.15;
}
.series-desc {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(.83rem,2vw,.93rem);
  color: var(--text2);
  line-height: 1.55;
  flex: 1;
  margin-bottom: 1.3rem;
}
.series-btn {
  font-family: 'Syne', sans-serif;
  font-size: clamp(10px,2vw,11px);
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .6rem 1.5rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 4px;
  transition: all .2s;
  display: inline-flex; align-items: center; gap: .5rem;
  align-self: flex-start;
}
.series-card:hover .series-btn { background: var(--gold); color: #0b0b10; border-color: var(--gold); }
.series-card:hover .series-btn .arrow { transform: translateX(3px); }
.arrow { transition: transform .2s; font-size: 1rem; }

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 700px) {
  .home-strip { padding: .45rem .9rem; }
  .app-header { padding: .85rem 1rem; }
  .app-header .logo-title { display: none; }
  .page { padding: 1.5rem .9rem 4rem; }
  .cluster-meta { flex-wrap: wrap; gap: .55rem; }
  .cluster-count { display: none; }
  .bottom-nav { padding: .85rem 1rem; }
  .dot-nav { max-width: 220px; }
  .word-grid { grid-template-columns: 1fr; }
  .word-name { font-size: 1.35rem; }
  .slide-action-bar { gap: .5rem; padding: .9rem .9rem; }
  .action-btn { font-size: 10px; padding: .5rem .9rem; }
  .quiz-status-badge { display: none; }
  .sr-due-badge { margin-left: 0; }

  .weak-item { grid-template-columns: 1fr 60px; }
  .weak-bar  { grid-column: 1 / -1; }

  .quiz-panel { max-height: 96vh; border-radius: var(--radius-md); }
  .quiz-question { font-size: 1.05rem; }
  .quiz-option { font-size: 12px; padding: .65rem .9rem; }

  .fc-panel { border-radius: var(--radius-md); }
  .fc-scene { padding: 1.1rem .9rem; min-height: 210px; }
  .fc-word-name { font-size: 1.9rem; }
  .fc-actions { padding: .75rem .9rem; }
  .fc-hint { display: none; }

  .card-grid { grid-template-columns: 1fr; max-width: 450px; margin: 0 auto; }
  .series-card { padding: 1.4rem 1.2rem 1.8rem; }
  .home-header { margin-bottom: 1.8rem; }
  .home-title { font-size: 2.1rem; }
  .home-stats-bar { gap: .9rem; padding: .7rem 1rem; }
  .home-stat-value { font-size: 1.1rem; }
}

@media (max-width: 380px) {
  .word-name { font-size: 1.25rem; }
  .fc-word-name { font-size: 1.7rem; }
  .cluster-theme { font-size: 1.55rem; }
  .quiz-option { font-size: 11px; }
  .home-stat-divider { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .fc-card { transition: none; }
  .progress-fill, .quiz-progress-fill, .fc-progress-fill { transition: none; }
  .page { animation: none; }
  .quiz-panel, .fc-panel { animation: none; }
}