/* ==========================================================
   VocabFlow — styles
   ========================================================== */

:root{
  --bg:#f6f6fb;
  --surface:#ffffff;
  --surface-2:#f3f1ff;
  --surface-3:#fafaff;
  --text:#1b1b2b;
  --text-2:#4d4c60;
  --muted:#77768b;
  --faint:#a9a8ba;
  --line:#e8e7f1;
  --line-2:#f0eff6;
  --track:#ecebf3;

  --primary:#6d5dfc;
  --primary-2:#5847ea;
  --primary-soft:rgba(109,93,252,.1);
  --ipa:#4d40c2;
  --danger:#e14f5c;
  --green:#1f9d6a;
  --orange:#e58d2f;
  --yellow:#f4c95d;

  --radius-sm:10px;
  --radius:14px;
  --radius-lg:22px;
  --shadow-sm:0 2px 8px rgba(32,28,78,.04);
  --shadow:0 12px 34px rgba(42,36,90,.07);
  --shadow-lg:0 28px 80px rgba(30,26,70,.18);

  --ease-out:cubic-bezier(.2,.8,.2,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);

  --font:"Be Vietnam Pro",Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-ipa:"Noto Sans","Segoe UI","Lucida Sans Unicode","Arial Unicode MS",sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;overflow-x:hidden;
  font-family:var(--font);font-size:14px;color:var(--text);
  background:linear-gradient(150deg,#fbfbff 0%,#f4f6fb 50%,#f8f4ff 100%);
  -webkit-font-smoothing:antialiased;
}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.55}
.hidden{display:none!important}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* ---------- Ambient background ---------- */
.ambient{position:fixed;border-radius:50%;filter:blur(14px);pointer-events:none;z-index:-1;opacity:.5;animation:ambientFloat 16s ease-in-out infinite alternate}
.ambient-one{width:460px;height:460px;right:-160px;top:60px;background:radial-gradient(circle,rgba(112,91,255,.22),transparent 68%)}
.ambient-two{width:380px;height:380px;left:200px;bottom:-190px;background:radial-gradient(circle,rgba(45,202,158,.15),transparent 70%);animation-delay:-7s}

/* ---------- Buttons ---------- */
.primary,.ghost,.danger,.danger-ghost{
  border:0;border-radius:var(--radius-sm);padding:10px 15px;font-weight:600;line-height:1.2;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  transition:transform .2s var(--ease-out),box-shadow .2s ease,border-color .2s ease,background .2s ease,color .2s ease;
}
.primary{background:linear-gradient(180deg,#7a6bff,var(--primary));color:#fff;box-shadow:0 8px 20px rgba(109,93,252,.24),inset 0 1px 0 rgba(255,255,255,.2)}
.primary:hover:not(:disabled){background:linear-gradient(180deg,#7061fb,var(--primary-2));transform:translateY(-1px);box-shadow:0 12px 26px rgba(109,93,252,.32)}
.ghost{background:var(--surface);color:var(--text-2);border:1px solid var(--line)}
.ghost:hover:not(:disabled){border-color:#d3cefa;color:var(--primary);transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.danger{background:var(--danger);color:#fff;box-shadow:0 8px 20px rgba(225,79,92,.22)}
.danger:hover{background:#cf3f4c;transform:translateY(-1px)}
.danger-ghost{background:#fff4f5;color:var(--danger);border:1px solid #ffdfe3}
.danger-ghost:hover:not(:disabled){background:#ffe9ec;transform:translateY(-1px)}
.primary:active:not(:disabled),.ghost:active:not(:disabled),.danger:active,.danger-ghost:active:not(:disabled){transform:translateY(1px) scale(.98)}
.full{width:100%}
.compact{padding:8px 11px;white-space:nowrap;font-size:13px}
.big{padding:13px 22px;font-size:15px}
.btn-icon{font-size:16px;line-height:1}
.button-icon{font-size:16px;line-height:1}
.button-spinner{display:inline-block;width:13px;height:13px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;opacity:.8;animation:spin .7s linear infinite}
.icon-btn{border:0;background:var(--surface-2);color:var(--primary);border-radius:10px;padding:8px 11px;font-size:17px}
.mobile-only{display:none}
.file-btn{cursor:pointer}
.file-btn input{display:none}

/* ---------- Sidebar ---------- */
.sidebar{
  position:fixed;inset:0 auto 0 0;width:280px;z-index:40;
  display:flex;flex-direction:column;padding:24px 18px;color:#fff;
  background:linear-gradient(165deg,#1a1a2b 0%,#11111c 100%);
  box-shadow:15px 0 50px rgba(19,18,38,.08);
}
.brand{display:flex;align-items:center;gap:12px;padding:2px 8px 24px}
.brand-mark{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;position:relative;overflow:hidden;font-weight:800;font-size:22px;background:linear-gradient(135deg,#9184ff,#5e4bf5);box-shadow:0 8px 30px rgba(109,93,252,.4)}
.brand-mark:after{content:"";position:absolute;inset:-60% 45% -60% -30%;background:rgba(255,255,255,.22);transform:rotate(24deg);animation:brandShine 5s ease-in-out infinite}
.brand-mark span{position:relative;z-index:1}
.brand h1{font-size:17px;margin:0;letter-spacing:-.01em}
.brand p{font-size:11px;color:#9e9eb2;margin:3px 0 0}
.side-section{margin-top:24px;min-height:0;display:flex;flex-direction:column;flex:1}
.side-title{font-size:11px;color:#8c8c9f;letter-spacing:.1em;font-weight:700;display:flex;justify-content:space-between;align-items:center;padding:0 8px 10px}
.mini-badge{background:#2b2b40;color:#c6c6d8;padding:2px 8px;border-radius:99px;font-size:10px}
.set-list{overflow:auto;padding-right:3px;scrollbar-width:thin;scrollbar-color:#33334a transparent}
.set-item{
  width:100%;border:0;background:transparent;color:#c0c0d0;text-align:left;
  padding:11px 12px;border-radius:12px;margin:3px 0;display:flex;gap:11px;align-items:center;position:relative;
  transition:transform .22s var(--ease-out),background .22s ease,color .22s ease;
  animation:slideInLeft .4s var(--ease-out) both;animation-delay:calc(var(--i,0) * 35ms);
}
.set-item:hover{background:#222234;color:#fff;transform:translateX(3px)}
.set-item.active{background:linear-gradient(90deg,#302e4f,#26253c);color:#fff}
.set-item.active:before{content:"";position:absolute;left:-18px;top:10px;bottom:10px;width:3px;border-radius:0 3px 3px 0;background:#9a8fff}
.set-dot{width:8px;height:8px;border-radius:50%;background:#5d52bd;flex:none;transition:box-shadow .25s ease,background .25s ease}
.set-item.active .set-dot{background:#a79dff;box-shadow:0 0 0 4px rgba(154,143,255,.16)}
.set-text{min-width:0}
.set-name{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.set-meta{display:block;font-size:10.5px;color:#7a7a90;margin-top:3px}
.set-empty{color:#76768c;font-size:12px;text-align:center;line-height:1.7;padding:22px 8px}
.sidebar-bottom{display:grid;gap:8px;margin-top:18px}
.sidebar .ghost{background:#1f1f2e;color:#bcbccd;border-color:#2c2c3d;justify-content:flex-start}
.sidebar .ghost:hover{background:#29293b;color:#fff;border-color:#3a3a52;box-shadow:none}
.sidebar-scrim{display:none}

/* ---------- Layout ---------- */
.app{margin-left:280px;min-height:100vh}
.topbar{
  height:84px;position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 38px;
  background:rgba(255,255,255,.74);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);
  border-bottom:1px solid rgba(232,231,241,.8);
}
.topbar-title{min-width:0;flex:1}
.topbar-title h2{font-size:21px;margin:5px 0 0;letter-spacing:-.015em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.eyebrow{font-size:10px;letter-spacing:.13em;color:#908fa5;font-weight:700}
.top-actions,.toolbar-actions{display:flex;gap:8px}
.workspace{padding:28px 38px 56px;max-width:1500px;margin:auto}

/* ---------- Empty state ---------- */
.empty-state{min-height:calc(100vh - 84px);display:grid;place-items:center;align-content:center;text-align:center;padding:30px;animation:riseIn .6s var(--ease-out) both}
.empty-icon{width:76px;height:76px;border-radius:24px;background:linear-gradient(135deg,#f1eeff,#e7e2ff);display:grid;place-items:center;color:var(--primary);font-size:34px;box-shadow:0 14px 34px rgba(109,93,252,.18);animation:floatY 3.6s ease-in-out infinite}
.empty-state h2{margin:20px 0 8px;font-size:26px;letter-spacing:-.02em}
.empty-state p{max-width:560px;color:var(--muted);line-height:1.7;margin:0 0 18px}
.empty-sample{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:24px}
.empty-sample span{background:var(--surface);border:1px solid var(--line);border-radius:99px;padding:7px 13px;font-size:12.5px;color:var(--text-2);box-shadow:var(--shadow-sm);animation:riseIn .5s var(--ease-out) both}
.empty-sample span:nth-child(2){animation-delay:.08s}
.empty-sample span:nth-child(3){animation-delay:.16s}

/* ---------- Stats ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
.stat-card{
  background:rgba(255,255,255,.86);backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.9);border-radius:16px;padding:18px 19px;position:relative;overflow:hidden;
  box-shadow:0 6px 22px rgba(32,28,78,.045);
  animation:riseIn .55s var(--ease-out) both;transition:transform .25s var(--ease-out),box-shadow .25s ease;
}
.stat-card:nth-child(2){animation-delay:.06s}
.stat-card:nth-child(3){animation-delay:.12s}
.stat-card:nth-child(4){animation-delay:.18s}
.stat-card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(50,42,118,.1)}
.stat-card>span{color:var(--muted);font-size:12px;font-weight:500}
.stat-card strong{display:block;font-size:30px;margin:6px 0 3px;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.stat-card small{color:var(--faint);font-size:11px}
.stat-icon{position:absolute;right:16px;top:16px;width:34px;height:34px;border-radius:11px;display:grid;place-items:center;font-size:14px;transition:transform .35s var(--ease-spring)}
.stat-card:hover .stat-icon{transform:rotate(-8deg) scale(1.1)}
.stat-icon.violet{background:#f0edff;color:var(--primary)}
.stat-icon.green{background:#e6f7ef;color:var(--green)}
.stat-icon.amber{background:#fff3df;color:var(--orange)}
.stat-icon.rose{background:#ffecef;color:var(--danger)}
.stat-meter{height:4px;border-radius:99px;background:var(--track);margin-top:10px;overflow:hidden}
.stat-meter span{display:block;height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,#34c48b,var(--green));transition:width .8s var(--ease-out)}

/* ---------- Toolbar & tabs ---------- */
.toolbar-card{
  background:rgba(255,255,255,.88);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:16px;padding:7px;
  display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:18px;box-shadow:0 8px 24px rgba(35,30,80,.035);
}
.mode-tabs{display:flex;gap:2px;overflow:auto;position:relative;scrollbar-width:none}
.mode-tabs::-webkit-scrollbar{display:none}
.tab-indicator{position:absolute;left:0;top:0;bottom:0;width:0;border-radius:10px;background:var(--surface-2);box-shadow:inset 0 0 0 1px rgba(101,87,245,.1);opacity:0;transition:transform .38s var(--ease-out),width .38s var(--ease-out),opacity .2s}
.tab-indicator.ready{opacity:1}
.tab{position:relative;z-index:1;border:0;background:transparent;color:#77768b;padding:10px 14px;border-radius:10px;font-weight:600;white-space:nowrap;display:inline-flex;align-items:center;gap:6px;transition:color .2s ease}
.tab:hover{color:var(--text)}
.tab.active{color:var(--primary)}
.tab-badge{min-width:18px;height:18px;padding:0 5px;border-radius:99px;background:var(--danger);color:#fff;font-size:10px;font-weight:700;display:inline-grid;place-items:center;animation:popIn .4s var(--ease-spring) both}

.view{display:none}
.view.active{display:block;animation:viewIn .4s var(--ease-out) both}

/* ---------- Word list ---------- */
.list-controls{display:flex;gap:10px;margin-bottom:12px;align-items:stretch}
.search-wrap{flex:1;background:var(--surface);border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;padding:0 13px;gap:8px;color:var(--faint);transition:border-color .2s,box-shadow .2s}
.search-wrap:focus-within{border-color:#a59bff;box-shadow:0 0 0 4px var(--primary-soft)}
.search-wrap input{width:100%;border:0;outline:0;padding:11px 0;background:transparent;box-shadow:none!important}
select,input,textarea{border:1px solid #dedde8;background:#fff;border-radius:10px;padding:10px 11px;outline:0;color:var(--text);transition:border-color .2s,box-shadow .2s}
select:focus,input:focus,textarea:focus{border-color:#9c91ff;box-shadow:0 0 0 4px var(--primary-soft)}
.filter-select{
  appearance:none;-webkit-appearance:none;min-width:178px;padding:11px 40px 11px 15px;border:1px solid var(--line);border-radius:12px;
  background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%236557f5' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 14px center;
  font-weight:600;color:#343346;cursor:pointer;
}
.filter-select:hover{border-color:#bdb5ff}
.ipa-action{white-space:nowrap}
.ipa-action:disabled{cursor:wait;opacity:.8}

.ipa-progress-row{display:flex;align-items:center;gap:12px;margin:-2px 2px 12px;animation:riseIn .3s var(--ease-out) both;transition:opacity .4s ease}
.ipa-progress-row.fade{opacity:0}
.ipa-progress{flex:1;height:6px;border-radius:99px;background:var(--track);overflow:hidden}
.ipa-progress span{display:block;height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,#9d92ff,var(--primary));transition:width .35s var(--ease-out);position:relative;overflow:hidden}
.ipa-progress-row[data-state="loading"] .ipa-progress span:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);animation:shimmer 1.1s linear infinite}
.ipa-progress-row[data-state="success"] .ipa-progress span{background:linear-gradient(90deg,#34c48b,var(--green))}
.ipa-progress-row[data-state="error"] .ipa-progress span{background:var(--danger)}
.ipa-status{font-size:12px;color:var(--muted);white-space:nowrap;display:inline-flex;align-items:center;gap:7px;font-variant-numeric:tabular-nums}
.ipa-status:before{content:"";width:7px;height:7px;border-radius:50%;background:#a6a5b4}
.ipa-status.loading:before{background:var(--primary);animation:pulse 1s infinite}
.ipa-status.success:before{background:var(--green)}
.ipa-status.error:before{background:var(--danger)}

.table-wrap{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 12px 35px rgba(35,30,80,.04)}
table{width:100%;border-collapse:collapse}
th{text-align:left;padding:13px 14px;font-size:10.5px;letter-spacing:.07em;font-weight:700;color:#9897a9;background:var(--surface-3);border-bottom:1px solid var(--line)}
td{padding:12px 14px;border-bottom:1px solid var(--line-2);font-size:13.5px;vertical-align:middle}
tbody tr{transition:background .2s ease}
tbody tr:hover{background:#faf9ff}
tbody tr:last-child td{border-bottom:0}
tbody.animate-rows tr{animation:rowIn .36s var(--ease-out) both;animation-delay:calc(var(--row-index) * 26ms)}
tbody tr.row-leave{animation:rowOut .24s ease-in forwards}
.word-main{font-weight:700;font-size:14.5px;letter-spacing:-.005em}
.word-example{color:var(--muted);font-size:11px;margin-top:4px;max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.meaning-cell{color:var(--text-2)}
.ipa-cell{white-space:nowrap}
.ipa-cell.ipa-updated .ipa{animation:ipaReveal .5s var(--ease-out) both}
.ipa,.card-ipa,.ipa-input{font-family:var(--font-ipa);font-style:normal;font-variant-ligatures:none;letter-spacing:.015em}
.ipa{color:var(--ipa);font-size:16px;line-height:1.6;vertical-align:middle}
.ipa.empty{color:var(--faint)}
.ipa-tag{display:inline-block;margin-left:6px;padding:1px 6px;border-radius:6px;background:var(--surface-2);color:#7c71e6;font-size:9.5px;font-weight:700;letter-spacing:.06em;vertical-align:middle}
.ipa-skeleton{display:inline-block;width:110px;height:14px;border-radius:7px;vertical-align:middle;background:linear-gradient(90deg,#efedf8 0%,#e1ddfa 50%,#efedf8 100%);background-size:200% 100%;animation:skeleton 1.1s ease-in-out infinite}
.row-actions{display:flex;justify-content:flex-end;gap:2px}
.tiny-btn{border:0;background:transparent;border-radius:8px;padding:6px 7px;color:#858499;line-height:1;transition:background .2s,color .2s,transform .2s var(--ease-spring)}
.tiny-btn:hover{background:var(--surface-2);color:var(--primary);transform:scale(1.1)}
.tiny-btn.danger-hover:hover{background:#fff0f2;color:var(--danger)}
.tiny-btn.sound{margin-left:2px;opacity:.6}
tr:hover .tiny-btn.sound{opacity:1}
.star-btn{border:0;background:transparent;font-size:17px;color:#cfcedb;padding:5px;transition:color .2s,transform .2s var(--ease-spring)}
.star-btn:hover{color:#f1af22;transform:scale(1.15)}
.star-btn.on{color:#f1af22}
.star-btn.pop{animation:starPop .45s var(--ease-spring)}
.status-pill{font-size:10.5px;border-radius:99px;padding:5px 9px;font-weight:700;white-space:nowrap}
.status-new{background:#f1f0f7;color:#858399}
.status-learning{background:#fff4dc;color:#b87516}
.status-known{background:#e7f7f0;color:#18835a}
.small-empty{text-align:center;padding:42px;color:var(--muted)}
.small-empty-icon{width:46px;height:46px;border-radius:14px;background:var(--surface-2);color:var(--primary);display:grid;place-items:center;margin:0 auto 8px;font-size:20px}
.small-empty p{margin:0}

/* ---------- Switch ---------- */
.switch{display:inline-flex;align-items:center;gap:8px;cursor:pointer;user-select:none;color:var(--muted);font-size:12.5px}
.switch input{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
.switch span{width:32px;height:18px;border-radius:99px;background:#dcdbe6;position:relative;flex:none;transition:background .25s ease}
.switch span:after{content:"";position:absolute;left:2px;top:2px;width:14px;height:14px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.18);transition:transform .3s var(--ease-spring)}
.switch input:checked+span{background:var(--primary)}
.switch input:checked+span:after{transform:translateX(14px)}
.switch input:focus-visible+span{outline:2px solid var(--primary);outline-offset:2px}

/* ---------- Flashcards ---------- */
.study-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:8px 2px 12px}
.study-head h3{margin:3px 0;font-size:20px;font-variant-numeric:tabular-nums}
.study-options{display:flex;gap:18px;flex-wrap:wrap}
.flash-track{height:5px;border-radius:99px;background:var(--track);overflow:hidden;margin:0 2px 24px}
.flash-track span{display:block;height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,#9d92ff,var(--primary));transition:width .45s var(--ease-out)}
.flash-stage{display:grid;grid-template-columns:52px minmax(280px,680px) 52px;align-items:center;justify-content:center;gap:16px;position:relative}
.flashcard{height:400px;perspective:1400px;outline:0;touch-action:pan-y;user-select:none}
.flashcard:focus-visible .flash-face{box-shadow:0 0 0 3px rgba(109,93,252,.35),var(--shadow)}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .7s var(--ease-out);transform-style:preserve-3d}
.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}
.flashcard.no-transition .flashcard-inner{transition:none}
.flashcard.leave-left{animation:cardLeaveLeft .16s ease-in forwards}
.flashcard.leave-right{animation:cardLeaveRight .16s ease-in forwards}
.flashcard.enter-right{animation:cardEnterRight .38s var(--ease-out) both}
.flashcard.enter-left{animation:cardEnterLeft .38s var(--ease-out) both}
.flash-face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:#fff;border:1px solid rgba(255,255,255,.9);border-radius:var(--radius-lg);box-shadow:var(--shadow);
  display:flex;flex-direction:column;align-items:center;justify-content:center;padding:42px;text-align:center;overflow:hidden;
  transition:box-shadow .3s ease;
}
.flashcard:hover .flash-face{box-shadow:0 22px 56px rgba(42,36,90,.11)}
.flash-face:before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,transparent 25%,rgba(255,255,255,.65) 48%,transparent 70%);transform:translateX(-120%);transition:transform .9s ease;pointer-events:none}
.flashcard:hover .flash-face:before{transform:translateX(120%)}
.flash-front{background:radial-gradient(circle at top right,#efebff 0,transparent 40%),radial-gradient(circle at bottom left,#f6f4ff 0,transparent 35%),#fff}
.flash-back{transform:rotateY(180deg);background:radial-gradient(circle at bottom left,#eafbf3 0,transparent 42%),#fff}
.card-label{font-size:10px;letter-spacing:.16em;font-weight:700;color:#a3a2b6;position:absolute;top:24px;left:26px}
.quiz-card .card-label{position:static}
.flash-face h2{font-size:40px;margin:10px 0 12px;max-width:100%;overflow-wrap:anywhere;letter-spacing:-.02em}
.flash-face p{font-size:18px;color:var(--muted);margin:0}
.card-ipa{color:var(--ipa)}
.flash-front .card-ipa{font-size:22px;padding:6px 16px;border-radius:99px;background:rgba(109,93,252,.07)}
.card-ipa.empty{color:var(--faint);background:transparent;font-size:14px;font-family:var(--font)}
.flip-hint{position:absolute;bottom:24px;color:#b1b0bf;font-size:11px;transition:color .2s}
.flashcard:hover .flip-hint{color:var(--primary)}
.sound-btn{position:absolute;right:22px;top:20px;border:0;background:#f3f2fc;width:40px;height:40px;border-radius:50%;font-size:16px;transition:transform .25s var(--ease-spring),background .2s}
.sound-btn:hover{transform:scale(1.12);background:#e9e6ff}
.sound-btn:active{transform:scale(.95)}
.example-text{margin-top:16px!important;font-size:14.5px!important;line-height:1.65;max-width:520px;font-style:italic}
.mnemonic-text{margin-top:12px!important;font-size:13px!important;color:#8f6a1f!important;max-width:520px;background:#fff8e8;border-radius:10px;padding:8px 12px}
.mnemonic-text:empty{display:none}
.nav-arrow{width:46px;height:46px;border:1px solid var(--line);background:#fff;border-radius:50%;font-size:26px;line-height:1;color:#77768b;transition:transform .25s var(--ease-spring),color .2s,border-color .2s,box-shadow .2s}
.nav-arrow:hover{color:var(--primary);border-color:#cfcafc;transform:scale(1.08);box-shadow:var(--shadow-sm)}
.nav-arrow:active{transform:scale(.94)}
.card-stamp{position:absolute;left:50%;top:-6px;transform:translate(-50%,0);pointer-events:none;opacity:0;z-index:5;background:#fff;border:1px solid var(--line);border-radius:99px;padding:7px 14px;box-shadow:var(--shadow);font-size:12px;display:flex;gap:8px;align-items:center;white-space:nowrap}
.card-stamp span{color:var(--muted)}
.card-stamp.show{animation:stamp 1.3s var(--ease-out) both}
.card-stamp.again b{color:var(--danger)}
.card-stamp.hard b{color:var(--orange)}
.card-stamp.good b{color:var(--green)}
.card-stamp.easy b{color:var(--primary)}
.rating-row{display:flex;justify-content:center;gap:8px;margin-top:24px;flex-wrap:wrap}
.rate{border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 15px;color:#5f5e72;font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:transform .2s var(--ease-out),box-shadow .2s,border-color .2s,background .2s}
.rate b{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:6px;background:#f1f0f5;font-size:11px;transition:background .2s,color .2s}
.rate:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.05)}
.again:hover{border-color:#f0a4ac}.again:hover b{background:#ffe8eb;color:var(--danger)}
.hard:hover{border-color:#f2bf78}.hard:hover b{background:#fff1dc;color:var(--orange)}
.good:hover{border-color:#7ed0ac}.good:hover b{background:#e3f6ed;color:var(--green)}
.easy:hover{border-color:#9c91ff}.easy:hover b{background:#eeebff;color:var(--primary)}
.rate.picked{animation:ratePick .45s var(--ease-spring)}
.keyboard-help{text-align:center;font-size:11.5px;color:#a3a2b3;margin-top:16px;line-height:2}
kbd{border:1px solid #dddbe7;border-bottom-width:2px;background:#fff;padding:1px 6px;border-radius:5px;font-family:inherit;font-size:10.5px;color:var(--text-2)}

/* ---------- Panels / quiz ---------- */
.panel,.quiz-card,.review-hero{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 8px 28px rgba(20,18,50,.04)}
.quiz-setup{display:grid;place-items:center;padding:30px 0}
.quiz-setup .panel{max-width:620px;width:100%;padding:32px;animation:riseIn .45s var(--ease-out) both}
.panel h2{margin:8px 0;letter-spacing:-.015em}
.panel p{color:var(--muted);line-height:1.6}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-grid label,.field{display:flex;flex-direction:column;gap:7px;font-size:12px;color:#6f6e82;font-weight:600}
.check-line{margin:18px 0 22px}
.quiz-playing{max-width:780px;margin:auto}
.quiz-top{display:flex;justify-content:space-between;font-size:12.5px;color:var(--muted);margin-bottom:8px;font-weight:600;font-variant-numeric:tabular-nums}
.progress-track{height:7px;background:var(--track);border-radius:99px;overflow:hidden;margin-bottom:18px}
.progress-bar{height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,#9d92ff,var(--primary));transition:width .5s var(--ease-out)}
.quiz-card{padding:32px;text-align:center}
.quiz-card.swap{animation:quizSwap .4s var(--ease-out) both}
.quiz-card.shake{animation:shake .42s ease}
.quiz-card h2{font-size:30px;margin:14px 0 6px;letter-spacing:-.015em}
.quiz-card>p{margin:0 0 24px;font-size:17px;min-height:4px}
.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.quiz-option{border:1px solid var(--line);background:#fff;border-radius:13px;padding:13px 14px;text-align:left;color:#4f4e60;display:flex;align-items:center;gap:11px;animation:riseIn .4s var(--ease-out) both;animation-delay:calc(var(--i) * 55ms);transition:border-color .2s,background .2s,transform .2s var(--ease-out),box-shadow .2s}
.quiz-option kbd{flex:none}
.quiz-option:hover:not(:disabled){border-color:#a99fff;background:#f8f7ff;transform:translateY(-2px);box-shadow:0 8px 18px rgba(109,93,252,.08)}
.quiz-option:disabled{opacity:1;cursor:default}
.quiz-option:disabled:not(.correct):not(.wrong){opacity:.55}
.quiz-option.correct{border-color:#5fc39a;background:#ebfaf3;color:#16734e;animation:correctPop .45s var(--ease-spring)}
.quiz-option.correct kbd{border-color:#5fc39a;color:#16734e}
.quiz-option.wrong{border-color:#ef9099;background:#fff0f1;color:#b93240}
.quiz-option.wrong kbd{border-color:#ef9099;color:#b93240}
.quiz-feedback{min-height:44px;padding:14px;font-size:13.5px;font-weight:600}
.quiz-feedback.good{color:var(--green);animation:popIn .35s var(--ease-spring)}
.quiz-feedback.bad{color:#b93240;animation:popIn .35s var(--ease-spring)}
#nextQuizBtn{animation:riseIn .3s var(--ease-out) both}
.quiz-result{text-align:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:36px;max-width:760px;margin:auto;position:relative;overflow:hidden;animation:riseIn .5s var(--ease-out) both}
.result-ring{width:128px;height:128px;margin:auto;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--primary) 0deg,var(--track) 0);position:relative;animation:popIn .5s var(--ease-spring) both}
.result-ring:before{content:"";position:absolute;inset:11px;background:#fff;border-radius:50%}
.result-ring span{position:relative;font-size:27px;font-weight:800;font-variant-numeric:tabular-nums}
.quiz-result h2{margin:18px 0 6px}
.quiz-result>p{color:var(--muted);margin:0}
.wrong-list{text-align:left;max-width:600px;margin:22px auto}
.wrong-list h4{margin:0 0 6px;font-size:13px;color:var(--muted)}
.wrong-item{padding:11px 12px;border-bottom:1px solid var(--line-2);font-size:13.5px;display:flex;gap:8px;align-items:baseline;animation:rowIn .35s var(--ease-out) both;animation-delay:calc(.3s + var(--i) * 45ms)}
.wrong-item span{color:var(--faint)}
.all-right{color:var(--green);font-weight:600}
.result-actions{display:flex;justify-content:center;gap:8px}
.confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.confetti span{position:absolute;top:-14px;width:8px;height:13px;border-radius:2px;opacity:0;animation:confetti 2s cubic-bezier(.25,.6,.45,1) forwards}

/* ---------- Review ---------- */
.review-hero{padding:26px;display:flex;justify-content:space-between;align-items:center;gap:16px;background:radial-gradient(circle at top right,#f0edff 0,transparent 40%),#fff}
.review-hero h2{margin:5px 0;letter-spacing:-.015em}
.review-hero p{margin:0;color:var(--muted)}
.due-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.due-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px;display:flex;flex-direction:column;gap:4px;animation:riseIn .4s var(--ease-out) both;animation-delay:calc(var(--i) * 35ms);transition:transform .2s var(--ease-out),box-shadow .2s}
.due-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.due-item em{font-size:13px}
.due-item span{color:var(--muted);font-size:12px}

/* ---------- Modals ---------- */
.modal-backdrop{position:fixed;inset:0;background:rgba(18,17,29,.42);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);z-index:60;display:none;align-items:center;justify-content:center;padding:18px}
.modal-backdrop.open{display:flex;animation:fadeIn .2s both}
.modal-backdrop.open .modal{animation:modalIn .38s var(--ease-out) both}
.modal-backdrop.closing{animation:fadeOut .18s forwards}
.modal-backdrop.closing .modal{animation:modalOut .18s ease-in forwards}
.modal{background:#fff;border-radius:20px;width:min(520px,100%);padding:24px;box-shadow:var(--shadow-lg);max-height:92vh;overflow:auto}
.modal-wide{width:min(760px,100%)}
.modal-small{width:min(420px,100%);text-align:center}
.modal-small h3{margin:12px 0 6px}
.modal-small p{color:var(--muted);line-height:1.6;margin:0}
.modal-small .modal-actions{justify-content:center}
.confirm-icon{width:52px;height:52px;border-radius:16px;margin:4px auto 0;display:grid;place-items:center;background:#fff0f2;color:var(--danger);font-size:24px;font-weight:800;animation:popIn .45s var(--ease-spring) .08s both}
.modal-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:18px}
.modal-head h3{margin:5px 0 0;font-size:19px;letter-spacing:-.01em}
.close-btn{border:0;background:#f3f2f7;width:34px;height:34px;border-radius:50%;font-size:19px;color:#88869a;flex:none;transition:transform .25s var(--ease-spring),background .2s,color .2s}
.close-btn:hover{transform:rotate(90deg);background:#ebe9f3;color:var(--text)}
.field{margin-bottom:13px}
.field input,.field textarea{width:100%;font-weight:400}
.field textarea{resize:vertical}
.field-hint{font-size:11px;font-weight:500;color:var(--green);min-height:0;opacity:0;transform:translateY(-3px);transition:opacity .25s,transform .25s}
.field-hint.show{opacity:1;transform:none}
.inline-field{display:flex;gap:7px}
.inline-field input{flex:1;min-width:0}
.ipa-input{font-size:15px;color:var(--ipa)}
.ipa-input.flash{animation:inputFlash .9s ease}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}
.modal-actions.split{justify-content:space-between;align-items:center}
.modal-actions.split>div{display:flex;gap:8px}
.helper{font-size:12px;color:var(--muted);line-height:1.6}
code{background:var(--surface-2);color:var(--primary-2);padding:1px 6px;border-radius:5px;font-size:.92em}
.bulk-area{width:100%;resize:vertical;line-height:1.7;font-size:13.5px}
.bulk-options{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:10px;flex-wrap:wrap}
.bulk-count{font-size:12px;color:var(--muted);padding:4px 10px;border-radius:99px;background:#f3f2f7;transition:background .25s,color .25s}
.bulk-count.has{background:#e6f7ef;color:var(--green);font-weight:600}
.notice{background:#f4f2ff;border:1px solid #ded9ff;color:#5b5676;border-radius:12px;padding:12px 14px;font-size:12.5px;line-height:1.6;margin-bottom:14px}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;z-index:100;pointer-events:none;
  display:flex;align-items:center;gap:9px;max-width:min(560px,calc(100vw - 32px));
  background:#1d1d2b;color:#fff;padding:10px 16px 10px 10px;border-radius:12px;font-size:12.5px;
  box-shadow:0 14px 34px rgba(0,0,0,.22);
  opacity:0;transform:translate(-50%,24px) scale(.96);transition:opacity .25s ease,transform .35s var(--ease-out);
}
.toast.show{opacity:1;transform:translate(-50%,0) scale(1)}
.toast-icon{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;flex:none;background:rgba(52,196,139,.2);color:#5ee0a8;font-weight:800;font-size:12px}
.toast.error{background:#3a1b22}
.toast.error .toast-icon{background:rgba(255,107,122,.2);color:#ff8d99}
.toast-text{line-height:1.45}

/* ---------- Keyframes ---------- */
@keyframes riseIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes viewIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes rowIn{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
@keyframes rowOut{to{opacity:0;transform:translateX(24px)}}
@keyframes slideInLeft{from{opacity:0;transform:translateX(-10px)}to{opacity:1;transform:none}}
@keyframes modalIn{from{opacity:0;transform:translateY(20px) scale(.96)}to{opacity:1;transform:none}}
@keyframes modalOut{to{opacity:0;transform:translateY(10px) scale(.98)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes fadeOut{to{opacity:0}}
@keyframes popIn{from{opacity:0;transform:scale(.7)}to{opacity:1;transform:none}}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(101,87,245,.4)}50%{box-shadow:0 0 0 5px rgba(101,87,245,0)}}
@keyframes ambientFloat{to{transform:translate3d(20px,-26px,0) scale(1.08)}}
@keyframes brandShine{0%,70%{transform:translateX(-180%) rotate(24deg)}100%{transform:translateX(380%) rotate(24deg)}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@keyframes shimmer{from{transform:translateX(-100%)}to{transform:translateX(100%)}}
@keyframes skeleton{from{background-position:200% 0}to{background-position:-200% 0}}
@keyframes ipaReveal{from{opacity:0;filter:blur(3px);transform:translateY(3px)}to{opacity:1;filter:none;transform:none}}
@keyframes starPop{0%{transform:scale(1)}40%{transform:scale(1.45) rotate(-12deg)}100%{transform:scale(1)}}
@keyframes cardLeaveLeft{to{opacity:0;transform:translateX(-46px) rotate(-3deg)}}
@keyframes cardLeaveRight{to{opacity:0;transform:translateX(46px) rotate(3deg)}}
@keyframes cardEnterRight{from{opacity:0;transform:translateX(46px) rotate(2deg)}to{opacity:1;transform:none}}
@keyframes cardEnterLeft{from{opacity:0;transform:translateX(-46px) rotate(-2deg)}to{opacity:1;transform:none}}
@keyframes stamp{0%{opacity:0;transform:translate(-50%,8px) scale(.9)}15%{opacity:1;transform:translate(-50%,-6px) scale(1)}75%{opacity:1;transform:translate(-50%,-6px)}100%{opacity:0;transform:translate(-50%,-18px)}}
@keyframes ratePick{0%{transform:scale(1)}40%{transform:scale(.92)}100%{transform:scale(1)}}
@keyframes quizSwap{from{opacity:.4;transform:translateY(8px) scale(.99)}to{opacity:1;transform:none}}
@keyframes shake{0%,100%{transform:none}20%{transform:translateX(-7px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(2px)}}
@keyframes correctPop{0%{transform:scale(1)}45%{transform:scale(1.035)}100%{transform:scale(1)}}
@keyframes confetti{0%{opacity:1;transform:translate(0,0) rotate(0)}100%{opacity:0;transform:translate(var(--dx),520px) rotate(var(--rot))}}
@keyframes inputFlash{0%{background:#efeaff;border-color:#9c91ff}100%{background:#fff}}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .due-grid{grid-template-columns:1fr 1fr}
  .workspace{padding:24px}
  .topbar{padding:0 24px}
}
@media (max-width:760px){
  .sidebar{transform:translateX(-100%);transition:transform .32s var(--ease-out);width:272px}
  .sidebar.open{transform:none;box-shadow:20px 0 60px rgba(0,0,0,.3)}
  .sidebar-scrim{display:block;position:fixed;inset:0;z-index:35;background:rgba(18,17,29,.4);opacity:0;pointer-events:none;transition:opacity .3s ease}
  .sidebar-scrim.show{opacity:1;pointer-events:auto}
  .app{margin-left:0}
  .mobile-only{display:inline-block}
  .top-actions .btn-label{display:none}
  .top-actions button{padding:9px 11px}
  .topbar{height:72px;padding:0 16px}
  .topbar-title h2{font-size:18px}
  .workspace{padding:16px}
  .stats-grid{grid-template-columns:1fr 1fr;gap:9px}
  .stat-card{padding:14px}
  .stat-card strong{font-size:25px}
  .stat-icon{width:28px;height:28px;right:12px;top:12px}
  .toolbar-card{align-items:stretch;flex-direction:column}
  .toolbar-actions{justify-content:stretch}
  .toolbar-actions>*{flex:1}
  .list-controls{flex-wrap:wrap}
  .search-wrap{min-width:100%}
  .filter-select,.ipa-action{flex:1}
  .table-wrap{overflow:auto}
  table{min-width:720px}
  .study-head{flex-direction:column;align-items:flex-start}
  .flash-stage{grid-template-columns:1fr;gap:12px}
  .nav-arrow{display:none}
  .flashcard{height:360px}
  .flash-face{padding:26px}
  .flash-face h2{font-size:31px}
  .rate{flex:1 1 40%;justify-content:center}
  .quiz-card{padding:22px}
  .quiz-options{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .due-grid{grid-template-columns:1fr}
  .review-hero{align-items:flex-start;flex-direction:column}
  .modal{padding:20px}
  .modal-actions.split{align-items:stretch;flex-direction:column}
  .modal-actions.split>div{justify-content:flex-end}
  .keyboard-help{display:none}
}

@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;animation-delay:0s!important;transition-duration:.01ms!important}
}