:root{
  color-scheme: dark;
  --bg:#0c0c0d;--bg2:#171719;--surface:rgba(24,24,27,.68);--surface2:rgba(255,255,255,.06);--solid:#18181b;
  --text:#f7f7f8;--muted:#a4a4aa;--line:rgba(255,255,255,.12);--line2:rgba(255,255,255,.2);
  --accent:#f3f0e8;--accentText:#141414;--good:#72d39d;--bad:#ff8383;--warn:#e6bf75;
  --shadow:0 26px 80px rgba(0,0,0,.36);--shadow2:0 14px 34px rgba(0,0,0,.25);
  --radius:28px;--radius2:18px;--blur:24px;
  --font:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;
}
[data-theme="light"]{
  color-scheme: light;
  --bg:#f6f3ee;--bg2:#ece7de;--surface:rgba(255,255,255,.7);--surface2:rgba(255,255,255,.56);--solid:#ffffff;
  --text:#171513;--muted:#68625d;--line:rgba(40,32,24,.13);--line2:rgba(40,32,24,.22);
  --accent:#151515;--accentText:#fff;--good:#287a52;--bad:#b84949;--warn:#a66d1c;
  --shadow:0 28px 86px rgba(70,50,25,.14);--shadow2:0 14px 34px rgba(70,50,25,.11);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;overflow-x:hidden;font-family:var(--font);color:var(--text);background:linear-gradient(135deg,var(--bg),var(--bg2));transition:background .45s ease,color .45s ease;padding-bottom:env(safe-area-inset-bottom)}
body.hide-cn .cn,body.hide-cn [data-cn]{filter:blur(5px);user-select:none}
body.hide-en .en,body.hide-en .word-main,body.hide-en #flashWord{filter:blur(5px);user-select:none}
button,input,select{font:inherit}button{touch-action:manipulation}
a{color:inherit;text-decoration:none}
.shell{width:min(1200px,calc(100% - 32px));margin:0 auto}.ambient{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}.ambient i{position:absolute;border-radius:999px;filter:blur(36px);opacity:.33;transform:translateZ(0)}.ambient i:nth-child(1){width:420px;height:420px;background:linear-gradient(135deg,#fff,#7b7b83);left:-180px;top:-80px}.ambient i:nth-child(2){width:360px;height:360px;background:linear-gradient(135deg,#b69d7d,#3c3c42);right:-160px;top:180px}.ambient i:nth-child(3){width:320px;height:320px;background:linear-gradient(135deg,#fff2d7,#7c8f86);left:38%;bottom:-160px;opacity:.18}
.site-header{position:sticky;top:0;z-index:50;padding:16px 0 10px;backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur))}.header-inner{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow2);border-radius:999px;padding:10px 12px;transition:.3s}.brand{display:flex;gap:11px;align-items:center;min-width:0}.brand-mark{width:42px;height:42px;border-radius:16px;display:grid;place-items:center;background:var(--accent);color:var(--accentText);font-weight:950;letter-spacing:-.07em;box-shadow:inset 0 -10px 18px rgba(0,0,0,.10)}.brand strong{display:block;font-size:17px;letter-spacing:-.04em;line-height:1}.brand small{display:block;color:var(--muted);font-size:12px;margin-top:3px;white-space:nowrap}.nav-tabs{display:flex;justify-content:center;gap:6px;overflow:auto;scrollbar-width:none}.nav-tabs::-webkit-scrollbar{display:none}.nav-tab,.icon-btn,.btn{border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--text);border-radius:999px;cursor:pointer;transition:transform .22s cubic-bezier(.2,1.2,.2,1),background .25s,border-color .25s,box-shadow .25s,color .25s}.nav-tab{padding:10px 14px;font-size:13px;font-weight:850;white-space:nowrap;color:var(--muted)}.nav-tab:hover,.btn:hover,.icon-btn:hover{transform:translateY(-2px);border-color:var(--line2)}.nav-tab.is-active{background:var(--accent);color:var(--accentText);border-color:transparent}.header-actions{display:flex;gap:7px}.icon-btn{width:40px;height:40px;font-weight:850}.icon-btn.is-active{background:var(--accent);color:var(--accentText);border-color:transparent}.btn{padding:11px 15px;font-weight:850;font-size:13px}.btn.primary{background:var(--accent);color:var(--accentText);border-color:transparent;box-shadow:0 12px 28px rgba(0,0,0,.18)}.btn.small{padding:8px 11px;font-size:12px}.btn.danger{color:var(--bad);border-color:color-mix(in srgb,var(--bad),transparent 55%)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.panel{position:relative;border:1px solid var(--line);background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));padding:22px;overflow:hidden;transition:background .35s,border-color .35s,transform .25s}.panel:before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;background:linear-gradient(135deg,rgba(255,255,255,.10),transparent 35%,rgba(255,255,255,.03));opacity:.75}.panel>*{position:relative}.grid-hero{display:grid;grid-template-columns:1.25fr .75fr;gap:16px;padding:24px 0 16px}.eyebrow{display:inline-flex;align-items:center;gap:9px;margin:0 0 16px;color:var(--muted);font-size:13px;border:1px solid var(--line);border-radius:999px;padding:8px 12px;background:var(--surface2)}.eyebrow span{width:8px;height:8px;border-radius:50%;background:var(--good);box-shadow:0 0 0 6px color-mix(in srgb,var(--good),transparent 84%)}h1{font-size:clamp(38px,7vw,76px);line-height:.94;letter-spacing:-.07em;margin:0 0 16px}.lead{color:var(--muted);font-size:16px;line-height:1.9;margin:0;max-width:760px}.hero-actions,.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.hero-actions{margin-top:20px}.notice{margin-top:18px;padding:13px;border:1px solid var(--line);border-radius:18px;color:var(--muted);line-height:1.7;background:rgba(255,255,255,.04)}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.stats-grid.slim{grid-template-columns:repeat(2,1fr)}.metric{border:1px solid var(--line);border-radius:20px;background:var(--surface2);padding:15px;min-width:0}.metric b{display:block;font-size:34px;line-height:1;letter-spacing:-.06em}.metric span{display:block;color:var(--muted);font-size:12px;margin-top:7px}.progress-line{height:11px;margin-top:14px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.06);overflow:hidden}.progress-line i{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--good),var(--accent));border-radius:999px;transition:width .45s cubic-bezier(.2,1,.2,1)}.device-line{margin-top:14px;display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px;align-items:center}.device-line code{font-family:var(--mono);font-size:11px;overflow:hidden;text-overflow:ellipsis}.view{display:none;animation:viewIn .32s cubic-bezier(.2,.85,.2,1) both}.view.is-active{display:block}@keyframes viewIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.dashboard-grid,.review-grid,.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.wide{grid-column:1/-1}.section-title{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:14px}.section-title span{font-size:18px;font-weight:930;letter-spacing:-.04em}.today-strip{display:flex;gap:10px;overflow-x:auto;flex-wrap:nowrap;padding-bottom:6px;scrollbar-width:thin}.today-strip::-webkit-scrollbar{height:4px}.today-strip::-webkit-scrollbar-thumb{background:var(--line2);border-radius:2px}.word-pill{flex:0 0 auto;border:1px solid var(--line);border-radius:16px;background:var(--surface2);padding:10px 12px;min-width:115px;transition:.25s}.word-pill:hover{transform:translateY(-2px);border-color:var(--line2)}.word-pill b{display:block}.word-pill span{display:block;color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.rings{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.ring{aspect-ratio:1;height:150px;border:1px solid var(--line);border-radius:24px;background:var(--surface2);display:grid;place-items:center;text-align:center;position:relative;overflow:hidden}.ring i{position:absolute;inset:14px;border-radius:50%;background:conic-gradient(var(--accent) 0deg,rgba(255,255,255,.08) 0deg);mask:radial-gradient(transparent 54%,#000 55%);-webkit-mask:radial-gradient(transparent 54%,#000 55%)}.ring b{font-size:28px;letter-spacing:-.06em}.ring span{color:var(--muted);font-size:12px}.tips{display:grid;gap:10px}.tip{border:1px solid var(--line);background:var(--surface2);border-radius:18px;padding:13px;line-height:1.7;color:var(--muted)}.toolbar{margin-bottom:14px}.search{flex:1;min-width:260px}input,select,textarea{width:100%;border:1px solid var(--line);background:rgba(255,255,255,.06);color:var(--text);border-radius:16px;padding:12px 13px;outline:none;transition:.2s;min-width:0}input:focus,select:focus,textarea:focus{border-color:var(--line2);box-shadow:0 0 0 5px rgba(255,255,255,.06)}select{max-width:190px}.soft-row{margin-top:10px}.alpha{display:flex;gap:7px;margin-top:12px;overflow:auto;scrollbar-width:none}.alpha button{min-width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--muted);font-weight:850;cursor:pointer}.alpha button.is-active{background:var(--accent);color:var(--accentText);border-color:transparent}.word-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.word-card{border:1px solid var(--line);background:var(--surface);border-radius:24px;box-shadow:var(--shadow2);overflow:hidden;transition:.25s}.word-card:hover{transform:translateY(-3px);border-color:var(--line2)}.word-card.known{border-color:color-mix(in srgb,var(--good),transparent 45%)}.word-card.unknown{border-color:color-mix(in srgb,var(--bad),transparent 42%)}.word-head{display:grid;grid-template-columns:1fr auto;gap:12px;padding:17px;cursor:pointer}.word-main{font-size:28px;font-weight:950;letter-spacing:-.06em;line-height:1;overflow-wrap:anywhere}.tag-row{display:flex;gap:7px;flex-wrap:wrap;margin-top:10px}.tag{border:1px solid var(--line);border-radius:999px;padding:5px 8px;font-size:12px;color:var(--muted);background:rgba(255,255,255,.04)}.tag.favorite{color:#d5a83e;border-color:rgba(213,168,62,.35)}.preview{margin-top:9px;color:var(--muted);font-size:14px;line-height:1.65;overflow-wrap:anywhere}.plus{width:36px;height:36px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;transition:.22s}.word-card.open .plus{transform:rotate(45deg)}.word-body{display:none;border-top:1px solid var(--line);padding:0 17px 17px}.word-card.open .word-body{display:block}.block{border:1px solid var(--line);background:rgba(255,255,255,.04);border-radius:18px;padding:13px;margin-top:12px}.block h3{font-size:13px;margin:0 0 8px;color:var(--text)}.block p{margin:0;color:var(--muted);line-height:1.75}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--line);border-radius:15px;padding:8px 10px;background:rgba(255,255,255,.04);font-size:13px;line-height:1.5}.example{border:1px solid var(--line);border-radius:16px;padding:10px;margin-top:8px;background:rgba(255,255,255,.035)}.example .en{font-weight:850;line-height:1.6}.example .cn{color:var(--muted);line-height:1.6;margin-top:4px}.note-box{display:grid;gap:8px}.note-box textarea{min-height:72px;resize:vertical}.pager{display:flex;justify-content:center;align-items:center;gap:12px;margin:18px 0 8px;color:var(--muted)}.practice-layout{display:grid;grid-template-columns:1fr 320px;gap:14px}.practice-head{display:flex;gap:10px;flex-wrap:wrap}.question-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:13px;margin:16px 0}.question-box{min-height:160px;border:1px solid var(--line);border-radius:24px;background:var(--surface2);display:grid;place-items:center;text-align:center;padding:22px}.question-main{font-size:clamp(34px,6vw,64px);font-weight:950;letter-spacing:-.06em;line-height:1.08;overflow-wrap:anywhere}.question-sub{color:var(--muted);line-height:1.7;margin-top:8px}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}.choice{min-height:76px;border:1px solid var(--line);background:rgba(255,255,255,.05);color:var(--text);border-radius:18px;text-align:left;padding:13px;cursor:pointer;font-weight:820;line-height:1.5;transition:.2s;overflow-wrap:anywhere}.choice:hover{transform:translateY(-2px);border-color:var(--line2)}.choice.good{background:color-mix(in srgb,var(--good),transparent 86%);border-color:color-mix(in srgb,var(--good),transparent 35%)}.choice.bad{background:color-mix(in srgb,var(--bad),transparent 87%);border-color:color-mix(in srgb,var(--bad),transparent 30%)}.spelling-box{display:flex;gap:10px;margin-top:14px}.feedback{display:none;margin-top:14px;border:1px solid var(--line);border-radius:18px;background:var(--surface2);padding:13px;color:var(--muted);line-height:1.7}.feedback.show{display:block}.flash-panel{min-height:560px}.flash-stage{min-height:390px;display:grid;place-items:center;perspective:none}.flash-card{width:min(720px,100%);height:350px;position:relative;transform-style:flat;transition:transform .58s cubic-bezier(.2,.9,.15,1.2);cursor:pointer;outline:none}.flash-card.flip{transform:none}.face{position:absolute;inset:0;border:1px solid var(--line);border-radius:32px;background:linear-gradient(135deg,rgba(255,255,255,.13),rgba(255,255,255,.035));backface-visibility:visible;box-shadow:var(--shadow);display:grid;place-items:center;text-align:center;padding:24px;overflow:hidden}.face.back{transform:none}.face b{display:block;font-size:clamp(42px,8vw,82px);letter-spacing:-.07em;line-height:.96;overflow-wrap:anywhere}.face span{display:block;color:var(--muted);line-height:1.65;margin-top:14px;font-size:15px}.center-row{justify-content:center}.review-grid .panel{min-height:260px}.list{display:grid;gap:8px;max-height:380px;overflow-y:auto;scrollbar-width:thin}.list::-webkit-scrollbar{width:4px}.list::-webkit-scrollbar-thumb{background:var(--line2);border-radius:2px}.list-item{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid var(--line);border-radius:16px;background:var(--surface2);padding:10px;min-width:0}.list-item b{display:block}.list-item span{display:block;color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:250px}.empty{border:1px dashed var(--line);border-radius:18px;color:var(--muted);padding:18px;text-align:center;line-height:1.7}.settings-grid .muted{color:var(--muted);line-height:1.8;margin-top:0}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.form-grid label{font-size:13px;color:var(--muted);display:grid;gap:7px}.storage-box,.danger-zone,.log{border:1px solid var(--line);border-radius:18px;background:var(--surface2);padding:13px;margin-top:14px;color:var(--muted);line-height:1.7}.danger-zone{display:flex;gap:10px;flex-wrap:wrap}.log{white-space:pre-wrap;max-height:260px;overflow:auto;font-family:var(--mono);font-size:12px}.footer{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:12px;padding:26px 0 36px}.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translate(-50%,22px) scale(.98);opacity:0;pointer-events:none;z-index:100;border:1px solid rgba(255,255,255,.18);background:rgba(18,18,18,.88);color:#fff;border-radius:999px;padding:12px 16px;box-shadow:var(--shadow);backdrop-filter:blur(16px);transition:.25s cubic-bezier(.2,1,.2,1);max-width:calc(100% - 28px);text-align:center;font-size:13px}.toast.show{opacity:1;transform:translate(-50%,0) scale(1)}
@media (prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media (max-width:980px){.site-header{position:static}.header-inner{grid-template-columns:1fr auto;border-radius:28px}.nav-tabs{grid-column:1/-1;justify-content:flex-start}.grid-hero,.practice-layout,.dashboard-grid,.review-grid,.settings-grid{grid-template-columns:1fr}.wide{grid-column:auto}.word-grid{grid-template-columns:1fr}.stats-grid.slim{grid-template-columns:repeat(4,1fr)}}
@media (max-width:620px){.shell{width:calc(100% - 18px)}.site-header{padding:10px 0 8px}.header-inner{padding:9px;gap:8px}.brand-mark{width:38px;height:38px;border-radius:15px}.brand small{display:none}.nav-tab{padding:9px 11px;font-size:12px}.icon-btn{width:36px;height:36px;font-size:12px}.grid-hero{padding:10px 0 12px}.panel{padding:16px;border-radius:24px}h1{font-size:42px}.lead{font-size:14px;line-height:1.8}.stats-grid,.stats-grid.slim,.rings,.choices,.form-grid{grid-template-columns:1fr}.metric b{font-size:30px}.search{min-width:100%}select{max-width:none;flex:1;min-width:140px}.word-main{font-size:24px}.question-box{min-height:132px;padding:16px}.question-main{font-size:38px}.flash-panel{min-height:auto}.flash-stage{min-height:330px}.flash-card{height:300px}.face{border-radius:26px}.spelling-box{flex-direction:column}.device-line{display:block}.device-line code{display:block;margin-top:6px}.list-item{align-items:flex-start}.footer{padding-bottom:28px}}

/* Lodcer Word cockpit upgrade */
:root{
  --pointer-x:70vw;
  --pointer-y:24vh;
  --teal:#57d7c4;
  --blue:#78a8ff;
  --gold:#f0cc7d;
  --violet:#aa8cff;
}

body{
  background:
    radial-gradient(circle at var(--pointer-x) var(--pointer-y), color-mix(in srgb,var(--teal),transparent 78%), transparent 34vw),
    radial-gradient(circle at 12% 18%, rgba(120,168,255,.18), transparent 32vw),
    radial-gradient(circle at 88% 12%, rgba(240,204,125,.14), transparent 28vw),
    linear-gradient(140deg,var(--bg) 0%,var(--bg2) 52%,#101318 100%);
}

[data-theme="light"] body{
  background:
    radial-gradient(circle at var(--pointer-x) var(--pointer-y), rgba(87,155,175,.16), transparent 35vw),
    radial-gradient(circle at 10% 10%, rgba(120,168,255,.16), transparent 34vw),
    radial-gradient(circle at 88% 16%, rgba(191,143,75,.14), transparent 30vw),
    linear-gradient(140deg,var(--bg) 0%,var(--bg2) 58%,#eef3f0 100%);
}

.ambient:before,.ambient:after,.scan-line,.word-field{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
}

.ambient:before{
  background-image:
    linear-gradient(rgba(255,255,255,.052) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at var(--pointer-x) var(--pointer-y), #000 0%, transparent 68%);
  -webkit-mask-image:radial-gradient(circle at var(--pointer-x) var(--pointer-y), #000 0%, transparent 68%);
  opacity:.6;
}

.ambient:after{
  background:
    linear-gradient(115deg, transparent 0 34%, rgba(87,215,196,.13) 44%, transparent 55% 100%),
    linear-gradient(68deg, transparent 0 56%, rgba(120,168,255,.12) 64%, transparent 74% 100%);
  animation:cockpitSweep 16s linear infinite;
  opacity:.72;
}

.ambient i{
  opacity:.2;
  filter:blur(46px);
}

.scan-line{
  background:linear-gradient(180deg, transparent, rgba(255,255,255,.08), transparent);
  height:36vh;
  top:-40vh;
  animation:scanDown 9s linear infinite;
  opacity:.36;
}

.word-field{
  background:
    repeating-linear-gradient(90deg, transparent 0 42px, rgba(255,255,255,.04) 42px 43px, transparent 43px 92px),
    linear-gradient(180deg, transparent, rgba(87,215,196,.08), transparent);
  transform:skewY(-9deg) translateY(18vh);
  opacity:.2;
  mask-image:linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
  -webkit-mask-image:linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}

@keyframes cockpitSweep{
  from{transform:translateX(-18%) translateY(-6%)}
  to{transform:translateX(18%) translateY(6%)}
}

@keyframes scanDown{
  from{transform:translateY(0)}
  to{transform:translateY(150vh)}
}

.site-header{
  padding-top:18px;
}

.header-inner{
  background:linear-gradient(135deg,rgba(22,26,30,.78),rgba(22,22,24,.58));
  box-shadow:0 22px 70px rgba(0,0,0,.3), inset 0 1px 0 rgba(255,255,255,.08);
}

[data-theme="light"] .header-inner{
  background:linear-gradient(135deg,rgba(255,255,255,.82),rgba(245,248,246,.66));
}

.brand-mark{
  background:linear-gradient(145deg,var(--accent),color-mix(in srgb,var(--teal),var(--accent) 35%));
}

.nav-tab{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:40px;
}

.nav-tab.is-active{
  box-shadow:0 12px 26px rgba(0,0,0,.2), inset 0 0 18px rgba(87,215,196,.18);
}

.panel,.word-card,.choice{
  transform:perspective(1200px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));
}

.panel:after,.word-card:after,.choice:after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:radial-gradient(circle at var(--mx,50%) var(--my,0%), rgba(255,255,255,.16), transparent 34%);
  opacity:0;
  transition:opacity .22s ease;
}

.panel:hover:after,.word-card:hover:after,.choice:hover:after{
  opacity:1;
}

.grid-hero{
  align-items:stretch;
}

body:not(.page-dashboard) .grid-hero{
  grid-template-columns:minmax(0,1fr) 360px;
  padding:18px 0 14px;
}

body:not(.page-dashboard) h1{
  font-size:52px;
  max-width:840px;
}

body:not(.page-dashboard) .lead{
  max-width:820px;
}

.hero-card{
  min-height:100%;
}

.hero-card:before{
  background:
    linear-gradient(135deg,rgba(255,255,255,.13),transparent 32%),
    radial-gradient(circle at 80% 10%, rgba(87,215,196,.22), transparent 32%),
    radial-gradient(circle at 14% 90%, rgba(120,168,255,.15), transparent 30%);
}

.cockpit-rail{
  display:grid;
  grid-template-columns:auto 1fr auto 1fr auto 1fr auto;
  align-items:center;
  gap:10px;
  margin-top:18px;
  color:var(--muted);
  font-family:var(--mono);
  font-size:11px;
}

.cockpit-rail i{
  height:2px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--teal),transparent);
  overflow:hidden;
}

.cockpit-rail i:after{
  content:"";
  display:block;
  width:38%;
  height:100%;
  background:#fff;
  animation:railPulse 2.8s ease-in-out infinite;
}

@keyframes railPulse{
  0%,100%{transform:translateX(-120%);opacity:.2}
  50%{transform:translateX(260%);opacity:.85}
}

.stat-card{
  display:grid;
  align-content:space-between;
}

.metric{
  background:
    linear-gradient(135deg,rgba(255,255,255,.075),rgba(255,255,255,.026)),
    radial-gradient(circle at 80% 20%, rgba(87,215,196,.16), transparent 46%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
}

.metric b,.ring b{
  font-variant-numeric:tabular-nums;
}

.progress-line{
  height:13px;
  background:linear-gradient(90deg,rgba(255,255,255,.04),rgba(255,255,255,.1));
}

.progress-line i{
  background:linear-gradient(90deg,var(--teal),var(--blue),var(--gold));
  box-shadow:0 0 22px rgba(87,215,196,.42);
}

.dashboard-grid{
  grid-template-columns:1.05fr .95fr;
}

.today-strip{
  padding:6px 0 10px;
}

.word-pill{
  min-width:148px;
  background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.035));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
}

.rings{
  perspective:1200px;
}

.ring{
  background:
    radial-gradient(circle at 50% 42%, rgba(87,215,196,.12), transparent 48%),
    linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.028));
}

.toolbar{
  position:sticky;
  top:86px;
  z-index:8;
}

.alpha button,.btn,.icon-btn,.choice{
  position:relative;
  overflow:hidden;
}

.btn:after,.icon-btn:after,.alpha button:after{
  content:"";
  position:absolute;
  inset:auto 18% 0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.65),transparent);
  opacity:.3;
}

.word-grid{
  perspective:none;
}

.word-card{
  position:relative;
  background:
    linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.035)),
    radial-gradient(circle at 100% 0%, rgba(120,168,255,.1), transparent 34%);
}

.word-card.known{
  box-shadow:0 16px 40px rgba(0,0,0,.2), inset 4px 0 0 color-mix(in srgb,var(--good),transparent 25%);
}

.word-card.unknown{
  box-shadow:0 16px 40px rgba(0,0,0,.2), inset 4px 0 0 color-mix(in srgb,var(--bad),transparent 22%);
}

.tag{
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}

.question-panel{
  min-height:620px;
}

.question-box{
  min-height:220px;
  background:
    radial-gradient(circle at 50% 0%, rgba(87,215,196,.16), transparent 42%),
    linear-gradient(145deg,rgba(255,255,255,.07),rgba(255,255,255,.025));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08), inset 0 -24px 70px rgba(0,0,0,.12);
}

.question-main{
  text-shadow:0 18px 46px rgba(0,0,0,.22);
}

.choice{
  min-height:92px;
  background:
    linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.032)),
    radial-gradient(circle at 100% 0%, rgba(120,168,255,.13), transparent 42%);
}

.choice.good{
  box-shadow:0 0 0 1px color-mix(in srgb,var(--good),transparent 20%), 0 18px 38px color-mix(in srgb,var(--good),transparent 78%);
}

.choice.bad{
  box-shadow:0 0 0 1px color-mix(in srgb,var(--bad),transparent 20%), 0 18px 38px color-mix(in srgb,var(--bad),transparent 78%);
}

.round-panel .metric{
  min-height:112px;
}

.flash-panel{
  background:
    radial-gradient(circle at 50% 36%, rgba(170,140,255,.12), transparent 36%),
    var(--surface);
}

.flash-stage{
  perspective:1700px;
}

.flash-card{
  filter:drop-shadow(0 28px 54px rgba(0,0,0,.28));
}

.face{
  background:
    linear-gradient(145deg,rgba(255,255,255,.16),rgba(255,255,255,.04)),
    radial-gradient(circle at 72% 14%, rgba(87,215,196,.18), transparent 34%),
    radial-gradient(circle at 18% 92%, rgba(240,204,125,.12), transparent 34%);
}

.face:after{
  content:"";
  position:absolute;
  inset:16px;
  border:1px solid rgba(255,255,255,.07);
  border-radius:24px;
  pointer-events:none;
}

.flash-front-content{
  display:grid;
  place-items:center;
  gap:12px;
}

.flash-front-content em{
  display:inline-flex;
  align-items:center;
  min-height:34px;
  padding:8px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--muted);
  font-style:normal;
  font-size:13px;
  background:rgba(255,255,255,.05);
}

.flash-detail{
  width:100%;
  height:100%;
  display:grid;
  grid-template-rows:auto 1fr auto;
  gap:14px;
  text-align:left;
  overflow:hidden;
}

.flash-detail-head{
  display:grid;
  gap:8px;
}

.flash-detail-head span{
  display:inline-flex;
  width:max-content;
  max-width:100%;
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 10px;
  color:var(--muted);
  font-family:var(--mono);
  font-size:11px;
}

.flash-detail-head b{
  font-size:24px;
  letter-spacing:0;
  line-height:1.35;
  text-align:left;
}

.flash-detail-grid{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:10px;
  overflow:auto;
  padding-right:4px;
  scrollbar-width:thin;
}

.flash-detail-grid::-webkit-scrollbar{
  width:4px;
}

.flash-detail-grid::-webkit-scrollbar-thumb{
  background:var(--line2);
  border-radius:2px;
}

.flash-detail-grid section{
  min-width:0;
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(255,255,255,.045);
  padding:12px;
}

.flash-detail-grid section.wide{
  grid-column:1/-1;
}

.flash-detail-grid h3{
  margin:0 0 8px;
  font-size:12px;
  color:var(--text);
}

.flash-detail-grid p{
  margin:0;
  color:var(--muted);
  line-height:1.7;
  font-size:13px;
}

.flash-mini-list{
  display:flex;
  flex-wrap:wrap;
  gap:7px;
}

.flash-mini-list span{
  display:grid;
  gap:3px;
  min-width:0;
  max-width:100%;
  border:1px solid var(--line);
  border-radius:14px;
  padding:8px 9px;
  background:rgba(255,255,255,.045);
}

.flash-mini-list b{
  font-size:13px;
  letter-spacing:0;
  line-height:1.25;
}

.flash-mini-list small,.flash-sentences small{
  color:var(--muted);
  line-height:1.45;
}

.flash-sentences{
  display:grid;
  gap:8px;
}

.flash-sentences div{
  border:1px solid var(--line);
  border-radius:14px;
  padding:9px;
  background:rgba(255,255,255,.04);
}

.flash-sentences p{
  color:var(--text);
  font-weight:820;
}

.flash-memory{
  display:flex;
  flex-wrap:wrap;
  gap:7px;
}

.flash-memory span,.flash-empty{
  display:inline-flex;
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 9px;
  color:var(--muted);
  font-size:12px;
  background:rgba(255,255,255,.045);
}

/* Flash cards open into an information sheet; they do not rotate. */
.flash-stage{
  min-height:0;
  perspective:none;
  align-items:start;
}

.flash-card{
  width:min(860px,100%);
  height:auto;
  min-height:330px;
  position:relative;
  display:grid;
  gap:12px;
  transform-style:flat;
  transition:min-height .28s ease, filter .25s ease, border-color .25s ease;
}

.flash-card.flip{
  transform:none;
  min-height:620px;
}

.flash-card.flip:hover{
  transform:none;
}

.flash-card .face{
  position:relative;
  inset:auto;
  min-height:330px;
  transform:none;
  backface-visibility:visible;
}

.flash-card .face.back{
  display:none;
  min-height:0;
  max-height:0;
  opacity:0;
  transform:none;
  overflow:hidden;
  place-items:stretch;
  padding:0;
  transition:opacity .22s ease, max-height .3s ease, padding .3s ease;
}

.flash-card.flip .face.back{
  display:grid;
  min-height:360px;
  max-height:520px;
  opacity:1;
  padding:22px;
}

.flash-card.flip .face.front{
  min-height:190px;
}

.flash-card.flip .flash-front-content b{
  font-size:clamp(36px,6vw,64px);
}

.flash-card.flip .flash-front-content em{
  color:var(--text);
  border-color:color-mix(in srgb,var(--teal),transparent 55%);
  background:color-mix(in srgb,var(--teal),transparent 88%);
}

.list-item{
  background:linear-gradient(145deg,rgba(255,255,255,.07),rgba(255,255,255,.032));
  transition:transform .22s ease,border-color .22s ease;
}

.list-item:hover{
  transform:translateY(-2px);
  border-color:var(--line2);
}

.settings-grid .panel{
  min-height:280px;
}

body.page-practice .practice-layout,
body.page-flash .flash-panel,
body.page-browse .word-grid,
body.page-review .review-grid,
body.page-settings .settings-grid{
  animation:deckIn .46s cubic-bezier(.2,.9,.2,1) both;
}

@keyframes deckIn{
  from{opacity:0;transform:translateY(18px) scale(.985)}
  to{opacity:1;transform:translateY(0) scale(1)}
}

[data-theme="light"] .panel,
[data-theme="light"] .word-card{
  background:rgba(255,255,255,.72);
}

[data-theme="light"] .ambient:before{
  background-image:
    linear-gradient(rgba(30,40,42,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,40,42,.06) 1px, transparent 1px);
}

@media (max-width:980px){
  body:not(.page-dashboard) .grid-hero{grid-template-columns:1fr}
  .toolbar{position:relative;top:auto}
}

@media (max-width:620px){
  .cockpit-rail{grid-template-columns:1fr;gap:6px}
  .cockpit-rail i{display:none}
  body:not(.page-dashboard) h1{font-size:36px}
  .question-panel{min-height:auto}
  .choice{min-height:76px}
}

/* Layout stability pass: keep interactions from moving the document vertically. */
html{
  overflow-y:scroll;
  scrollbar-gutter:stable;
}

.view{
  animation:stableFade .18s ease both;
}

@keyframes stableFade{
  from{opacity:.96}
  to{opacity:1}
}

.nav-tab:hover,
.btn:hover,
.icon-btn:hover,
.word-pill:hover,
.word-card:hover,
.choice:hover,
.list-item:hover,
.flash-card:hover,
.flash-card.flip:hover{
  transform:none!important;
}

.panel,
.word-card,
.choice{
  transform:none!important;
}

body.page-practice .practice-layout,
body.page-flash .flash-panel,
body.page-browse .word-grid,
body.page-review .review-grid,
body.page-settings .settings-grid{
  animation:stableFade .18s ease both;
}

.hero.grid-hero{
  min-height:300px;
}

body:not(.page-dashboard) .hero.grid-hero{
  min-height:250px;
}

.stat-card{
  min-height:260px;
}

.toolbar{
  min-height:150px;
}

.pager{
  min-height:46px;
}

.question-panel{
  min-height:720px;
}

.question-box{
  min-height:230px;
}

.choices{
  min-height:194px;
  align-content:start;
}

.spelling-box{
  min-height:54px;
  opacity:1;
  visibility:visible;
  transition:opacity .18s ease;
}

.spelling-box.is-collapsed{
  opacity:0;
  visibility:hidden;
  pointer-events:none;
}

.feedback{
  display:block;
  min-height:118px;
  opacity:0;
  visibility:hidden;
  overflow:auto;
  scrollbar-width:thin;
}

.feedback.show{
  display:block;
  opacity:1;
  visibility:visible;
}

.word-grid{
  align-items:start;
}

.word-card{
  min-height:176px;
}

.word-card .word-body{
  max-height:0;
  overflow:hidden;
  display:block;
  padding-top:0;
  padding-bottom:0;
}

.word-card.open .word-body{
  max-height:520px;
  overflow:auto;
  padding:0 17px 17px;
  scrollbar-width:thin;
}

.flash-panel{
  min-height:820px;
}

.flash-stage{
  min-height:650px;
  align-items:start;
}

.flash-card{
  min-height:640px;
}

.flash-card.flip{
  min-height:640px;
}

.flash-card .face.front{
  min-height:190px;
}

.flash-card .face.back{
  display:grid;
  min-height:380px;
  max-height:420px;
  opacity:0;
  visibility:hidden;
  padding:22px;
  pointer-events:none;
}

.flash-card.flip .face.back{
  min-height:380px;
  max-height:420px;
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}

.flash-detail-grid{
  min-height:0;
  max-height:245px;
}

.list{
  min-height:260px;
}

.review-grid .panel,
.settings-grid .panel{
  min-height:320px;
}

@media (max-width:980px){
  .toolbar{min-height:190px}
  .hero.grid-hero,
  body:not(.page-dashboard) .hero.grid-hero{min-height:auto}
}

@media (max-width:620px){
  .toolbar{min-height:240px}
  .question-panel{min-height:760px}
  .choices{min-height:352px}
  .flash-panel{min-height:860px}
  .flash-stage{min-height:690px}
  .flash-card,
  .flash-card.flip{min-height:680px}
  .flash-detail-grid{grid-template-columns:1fr;max-height:300px}
}