:root{font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:#1d2945;background:#f5f7fc;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,select,input{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.4}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #e8a232;outline-offset:4px}header{height:100px;padding:0 6%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e1e5ef;background:white}.brand{display:flex;align-items:center;gap:13px;font-size:25px;font-weight:750;text-decoration:none;color:inherit}.logo{display:grid;place-items:center;width:43px;height:43px;border-radius:12px;background:#2744cb;color:white;font-family:serif}.brand small{font-size:14px;color:#67718a;margin-left:12px;font-weight:400}.header-note{color:#67718a;font-size:14px}main{max-width:1250px;margin:54px auto 65px;padding:0 32px;display:grid;grid-template-columns:280px minmax(0,1fr);gap:62px}h1{font-size:20px;margin:0}h2{font-size:29px;margin:6px 0 0;letter-spacing:-.7px}.section-heading{display:flex;justify-content:space-between;align-items:center}.section-heading>span{font-size:14px;color:#67718a}.muted{color:#67718a;line-height:1.8;font-size:14px}.set{display:flex;align-items:center;gap:12px;padding:18px 15px;margin:12px 0;border:1px solid #dee3f0;border-radius:12px;cursor:pointer;background:white}.set:has(input:checked){border-color:#9aaaf5;background:#edf0ff}.set input{width:18px;height:18px;accent-color:#2744cb;flex-shrink:0}.set strong{display:block;font-size:15px;font-weight:600}.set small{display:block;color:#67718a;font-size:13px;margin-top:7px}.small{font-size:13px;line-height:1.7}a{color:#2744cb}.sample-note{font-size:13px;color:#67718a;line-height:1.8;border-top:1px solid #dee3f0;padding-top:20px;margin-top:28px}.practice-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.eyebrow{font-size:12px;letter-spacing:2px;color:#2744cb;font-weight:700;margin:0}.badge{background:#e8ecfa;padding:8px 12px;border-radius:20px;font-size:13px;white-space:nowrap;color:#42558f}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:29px 0 25px}fieldset{display:flex;margin:0;padding:4px;border:0;border-radius:10px;background:#e7ebf5}fieldset label{position:relative}fieldset input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}fieldset span{display:block;padding:9px 15px;font-size:14px;border-radius:7px;color:#626e89}fieldset input:checked+span{background:white;color:#2744cb;box-shadow:0 2px 5px #2336630d}fieldset input:focus-visible+span{outline:3px solid #e8a232}.direction-label{font-size:14px;color:#67718a}select{padding:8px;border:1px solid #d9deeb;border-radius:7px;background:white;color:#354778;margin-left:6px}.card-meta{display:flex;justify-content:space-between;margin-bottom:12px;color:#67718a;font-size:13px}.card{min-height:335px;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid #dce2f2;border-radius:22px;background:white;box-shadow:0 12px 35px #25356d08;padding:30px;color:#1d2945;position:relative;overflow-wrap:anywhere;touch-action:pan-y pinch-zoom}.face-label{font-size:12px;letter-spacing:2px;color:#77829b;margin-bottom:30px}.word{font-family:"Yu Mincho","Noto Serif JP",serif;font-size:clamp(36px,5vw,62px);line-height:1.4}.reading{font-size:20px;color:#536184;margin-top:8px;min-height:28px}.meaning{font-size:23px;color:#2744cb;margin-top:12px}.meaning:empty{display:none}.flip-hint{font-size:13px;color:#77829b;margin-top:27px}progress{appearance:none;width:100%;height:4px;display:block;margin:21px 0 25px;border:0;border-radius:8px;overflow:hidden;background:#e1e6f3}progress::-webkit-progress-bar{background:#e1e6f3}progress::-webkit-progress-value{background:#3655d8}progress::-moz-progress-bar{background:#3655d8}.controls{display:grid;grid-template-columns:1fr 1.35fr 1fr;gap:14px}.controls button{border-radius:10px;padding:14px 10px;font-size:15px}.primary{border:1px solid #2744cb;background:#2744cb;color:white}.primary:hover{background:#1d35ad}.secondary{background:white;border:1px solid #dce2f2;color:#485675}.practice-footer{display:flex;justify-content:space-between;align-items:center;margin-top:23px;gap:10px;font-size:12px;color:#77829b}kbd{font-family:inherit;font-size:12px}.text-button{border:0;background:none;color:#53658b;font-size:13px;padding:8px}body>footer{max-width:1186px;margin:0 auto;padding:22px 0;border-top:1px solid #e1e5ef;color:#8992a8;font-size:12px;letter-spacing:1px;display:flex;justify-content:space-between}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:800px){header{height:78px;padding:0 22px}.header-note{display:none}main{grid-template-columns:1fr;gap:30px;margin:28px auto;padding:0 20px}#sets{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.set{margin:0;padding:13px 10px}.sample-note{margin-top:15px;padding-top:12px}h2{font-size:24px}.card{min-height:300px}.practice-footer{flex-wrap:wrap}body>footer{margin:30px 20px}.toolbar{flex-wrap:wrap}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,box-shadow .15s}.card:hover{box-shadow:0 15px 40px #25356d13}}
#sets{max-height:420px;overflow-y:auto;padding:4px;scrollbar-gutter:stable}
@media(max-width:800px){#sets{max-height:240px}}
/* Focused practice surface and secondary panels. */
[hidden]{display:none!important}
header{height:80px;padding:0 max(24px,calc((100% - 1000px)/2));gap:20px}
main{display:block;max-width:760px;margin:40px auto;padding:0 24px}
.card{min-height:340px}
button.secondary{padding:10px 16px;border-radius:9px}
.menu-wrap{position:relative;flex-shrink:0}
#app-menu{position:absolute;right:0;top:calc(100% + 10px);z-index:5;width:220px;padding:8px;background:white;border:1px solid #dce2f2;border-radius:14px;box-shadow:0 12px 36px #1d29451a}
#app-menu button{display:block;width:100%;text-align:left;padding:14px;border:0;background:none;border-radius:8px;color:#1d2945}
#app-menu button:hover{background:#edf0ff}
dialog{width:min(620px,calc(100% - 32px));max-height:85dvh;padding:28px;border:1px solid #dce2f2;border-radius:20px;color:#1d2945;background:#fff;box-shadow:0 24px 90px #1d294533;overflow:auto}
dialog::backdrop{background:#16233e66}
body:has(dialog[open]){overflow:hidden}
.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}
.panel-heading h2{font-size:23px;margin:0}
dialog .section-heading h3{font-size:16px;margin:0}
dialog #sets{display:block;max-height:52dvh;padding:4px 0}
dialog .set{margin:0;padding:9px 4px;min-height:42px;border:0;border-radius:0;gap:10px;background:transparent}
dialog .set:hover{background:#f5f7fc}
dialog .set:has(input:checked){background:#edf0ff}
dialog .set>span{display:flex;align-items:baseline;justify-content:space-between;gap:12px;min-width:0;flex:1}
dialog .set strong{font-size:14px;line-height:1.5;font-weight:500;overflow-wrap:anywhere}
dialog .set small{margin:0;font-size:13px;white-space:nowrap;flex-shrink:0}
dialog .set input{margin:0;flex-shrink:0}
dialog fieldset{display:block;padding:16px;background:#f5f7fc;margin:24px 0;border:1px solid #dce2f2}
dialog fieldset legend{font-size:16px;padding:0 5px}
dialog fieldset label{display:flex;align-items:center;gap:10px}
dialog fieldset input{position:static;opacity:1;width:18px;height:18px;accent-color:#2744cb}
dialog fieldset span{font-size:16px}
dialog .direction-label{display:flex;align-items:center;justify-content:space-between;font-size:16px;padding:12px 0}
#preferences-panel .direction-label{gap:16px}
.panel-heading .icon-close{width:44px;height:44px;padding:0;display:grid;place-items:center;flex-shrink:0}
#preferences-panel .preference-switch{appearance:none;position:relative;flex-shrink:0;width:56px;height:32px;margin:6px 0;border:1px solid #b8c2d8;border-radius:999px;background:#e7ebf5;cursor:pointer}
#preferences-panel .preference-switch::before{content:'';position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;background:white;box-shadow:0 1px 4px #25356d30}
#preferences-panel .preference-switch:checked{background:#2744cb;border-color:#2744cb}
#preferences-panel .preference-switch:checked::before{transform:translateX(24px)}
@media(prefers-reduced-motion:no-preference){.preference-switch{transition:background .18s,border-color .18s}.preference-switch::before{transition:transform .18s}}
#preferences-panel select{width:128px;min-height:44px;margin:0;flex-shrink:0}
#history-list{list-style:none;padding:0;margin:0}
#history-list li{padding:18px 0;border-bottom:1px solid #e1e5ef}
#history-list p{margin:8px 0 0;font-size:14px;color:#67718a;line-height:1.6;overflow-wrap:anywhere}
#history-list strong{font-size:16px}
#storage-status{max-width:712px;margin:20px auto;color:#865400;font-size:14px;padding:0 24px}
#choose-sets{margin:0 0 18px}
.card-meta{gap:16px;line-height:1.6}.card-meta span:first-child{overflow-wrap:anywhere}.card-meta span:last-child{white-space:nowrap}
header{height:auto;min-height:80px;padding-top:14px;padding-bottom:14px}
header .brand{flex-shrink:0}
.header-context{flex:1;min-width:0;display:flex;align-items:center;justify-content:flex-end;gap:18px}
#lesson{font-size:14px;color:#67718a;line-height:1.6;overflow-wrap:anywhere}
#loaded{flex-shrink:0}
#menu-button{width:44px;height:44px;padding:0;font-size:22px;display:grid;place-items:center}
.card-meta{justify-content:flex-end}
@media(max-width:900px){header .brand small{display:none}.header-context{flex-direction:column;align-items:flex-start;gap:5px}#loaded{background:none;padding:0;font-size:12px}}
@media(max-width:600px){header{height:72px;padding:0 18px}.brand small{display:none}main{margin:28px auto;padding:0 16px}.card{min-height:300px;padding:24px 18px}.practice-heading{flex-wrap:wrap}.controls{gap:8px}.controls button{padding:13px 6px;font-size:14px}dialog{padding:20px}.practice-footer{font-size:12px}.word{font-size:clamp(30px,8vw,46px)}}
@media(max-width:600px){header{height:auto;gap:12px;padding-top:12px;padding-bottom:12px}.brand{gap:8px;font-size:20px}.logo{width:36px;height:36px}#lesson{font-size:13px}}
@media(max-width:420px){header .brand>span:last-child{display:none}}

/* Header and footer frame a flexible practice area in either orientation. */
body{height:100dvh;display:grid;grid-template-rows:auto minmax(0,1fr) auto auto}
main{width:100%;max-width:none;min-height:0;margin:0;padding:12px 16px 8px}
.practice{height:100%;min-height:0;display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr) 4px auto;gap:12px;grid-template-areas:'meta' 'card' 'progress' 'controls'}
.card-meta{grid-area:meta;margin:0}
.card{grid-area:card;min-height:0;height:100%;padding:12px 18px}
progress{grid-area:progress;margin:0}
.controls{grid-area:controls}
body>.practice-footer{width:100%;max-width:none;margin:0;padding:4px max(16px,env(safe-area-inset-right)) max(4px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left));border:0;letter-spacing:normal;gap:8px;flex-wrap:nowrap}
.practice-footer .text-button{min-height:36px;white-space:nowrap}
#choose-sets{grid-area:card;z-index:1;align-self:end;justify-self:center;margin:8px}
.practice:has(#choose-sets:not([hidden])) .flip-hint{visibility:hidden}
#storage-status{margin:0;padding:4px 16px;font-size:12px}
#storage-status:empty{display:none}
.card .face-label{font-size:22px;line-height:1;letter-spacing:0;margin:0 0 auto;flex-shrink:0}
.card .flip-hint{margin:auto 0 0;flex-shrink:0}
@media(orientation:portrait){
  .card{align-self:center}
  .card .reading:empty{display:none}
}
@media(orientation:portrait) and (max-height:650px){
  .face-label{margin-bottom:10px}
  .word{font-size:28px;line-height:1.25}
  .reading{font-size:16px;min-height:0;margin-top:4px}
  .reading:empty{display:none}
  .meaning{font-size:18px;margin-top:6px}
  .flip-hint{margin-top:12px;font-size:12px}
}
@media(orientation:landscape){
  header{min-height:0;padding:8px max(16px,env(safe-area-inset-right)) 8px max(16px,env(safe-area-inset-left));gap:16px}
  header .logo{width:32px;height:32px}
  header .brand{font-size:20px}
  header .brand small{display:none}
  .header-context{flex-direction:row;align-items:center;gap:12px}
  #lesson{font-size:12px;line-height:1.3}
  #loaded{font-size:12px;background:none;padding:0}
  #menu-button{width:40px;height:40px}
  main{padding:8px max(16px,env(safe-area-inset-right)) 8px max(16px,env(safe-area-inset-left))}
  .practice{grid-template-columns:minmax(0,1fr) 112px;grid-template-rows:auto minmax(0,1fr) 4px;gap:8px 16px;grid-template-areas:'meta controls' 'card controls' 'progress controls'}
  body[data-navigation-side="left"] .practice{grid-template-columns:112px minmax(0,1fr);grid-template-areas:'controls meta' 'controls card' 'controls progress'}
  .card-meta{grid-area:meta;margin:0;line-height:1;font-size:12px}
  .card{grid-area:card;min-height:0;height:100%;padding:8px 16px;border-radius:16px}
  .face-label{font-size:10px;margin-bottom:clamp(2px,1.5dvh,12px)}
  .word{font-size:clamp(22px,6dvh,48px);line-height:1.2}
  .reading{font-size:clamp(13px,3.5dvh,20px);line-height:1.3;min-height:0;margin-top:4px}
  .reading:empty{display:none}
  .meaning{font-size:clamp(14px,4dvh,23px);line-height:1.3;margin-top:4px}
  .flip-hint{font-size:11px;margin-top:clamp(3px,1.5dvh,12px)}
  progress{grid-area:progress;margin:0}
  .controls{grid-area:controls;display:flex;flex-direction:column;justify-content:flex-end;gap:12px}
  .controls button{min-height:44px;padding:10px 6px;font-size:14px}
  .practice-footer{margin:0;font-size:11px;flex-wrap:nowrap}
  .practice-footer .text-button{padding:4px;min-height:32px}
  #choose-sets{grid-area:card;z-index:1;align-self:end;justify-self:center;margin:8px}
  .practice:has(#choose-sets:not([hidden])) .flip-hint{visibility:hidden}
  #storage-status{margin:0;padding:4px 16px;font-size:12px}
}

/* Approved teal and blue language-card logo. */
.card-shell{grid-area:card;position:relative;min-height:0;height:100%;align-self:center}
.card-shell .card{height:100%}
.speech-status{position:absolute;top:8px;right:6px;max-width:calc(100% - 12px);padding:8px;border:1px solid #dce2f2;border-radius:8px;background:white;color:#485675;font-size:12px;box-shadow:0 4px 12px #25356d18}
.speech-status:empty{display:none}
header .brand .logo{display:block;object-fit:contain;flex-shrink:0;background:transparent;border-radius:0}

.controls{grid-template-columns:minmax(0,1fr) minmax(0,1fr) 48px minmax(0,1fr)}
#star{font-size:26px;padding:0}
#star[aria-pressed="true"]{color:#946200;background:#fff5d6;border-color:#d3aa50}
#app-menu [aria-pressed="true"]{background:#edf0ff;color:#2744cb}
@media(orientation:landscape){.controls{gap:8px}}
#microphone{display:flex;flex-direction:row;align-items:center;justify-content:center;gap:6px;padding:6px}
#microphone-label{font-size:12px;line-height:16px;white-space:nowrap}
#microphone[aria-pressed="true"]{box-shadow:inset 0 -3px #2744cb}
#voice-status:not(:empty){position:fixed;bottom:8px;left:50%;transform:translateX(-50%);width:max-content;max-width:90vw;height:auto;margin:0;padding:8px 12px;overflow:visible;clip:auto;white-space:normal;border:1px solid #dce2f2;border-radius:8px;background:white;color:#485675;font-size:12px;z-index:2}

.controls button{height:48px;min-height:48px}