/* Noto Serif JP decorative subset (SIL OFL; see vendor/NotoSerifJP-OFL.txt). */
@font-face{font-family:"LearningHub Decorative";src:url('/vendor/decorative-serif.ttf') format('truetype');font-style:normal;font-weight:400;font-display:block}
:root{color-scheme:light;--paper:#f7f6f0;--surface:#fffefb;--ink:#233d32;--quiet:#69786b;--line:#e0e5da;--soft:#e9eee4;--brand:#294c3c;--accent:#b8cbaa;--serif:"Yu Mincho","Noto Serif CJK JP","Songti SC",serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{color:inherit;cursor:pointer;transition:background .2s,transform .18s;border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:11px 16px;min-height:44px}button:hover{background:var(--soft)}button:active{transform:scale(.98)}button:disabled{opacity:.55;cursor:wait}a{color:var(--brand);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #759376;outline-offset:4px}.shell{max-width:1120px;margin:auto;padding:0 48px}.chrome{display:flex;justify-content:space-between;align-items:center;padding:29px 0;border-bottom:1px solid var(--line);gap:12px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:600;font-size:17px;letter-spacing:-.4px}.brand small{display:block;font-weight:400;color:var(--quiet);font-size:10px;letter-spacing:2px}.mark{display:grid;place-items:center;width:43px;height:43px;background:var(--brand);border-radius:13px;color:var(--paper);font:27px var(--serif)}.status{font-size:11px;border-radius:30px;max-width:210px;padding:8px 12px;min-height:36px;color:var(--quiet);background:transparent}main{padding:44px 0 60px;min-height:76vh;outline:none}h1{font-size:38px;line-height:1.35;letter-spacing:-1.5px;font-weight:500;margin:10px 0 14px}h2{font-size:21px;font-weight:500;line-height:1.5;margin:0 0 12px}h3{font-size:17px;font-weight:500;margin:0 0 8px}p{margin:8px 0 16px;color:var(--quiet)}.eyebrow{font-size:10px;letter-spacing:2.5px;color:var(--quiet);font-weight:600}.page-head{margin-bottom:30px}.page-head p{font-size:14px}.head-row{display:flex;justify-content:space-between;align-items:end;gap:20px}.week-dates{display:flex;gap:8px;margin-bottom:24px}.day{display:grid;place-items:center;gap:3px;min-width:39px;border-radius:13px;padding:8px 4px;font-size:14px;color:var(--quiet)}.day small{font-size:10px}.day.weekend{background:#edf0e5;color:var(--ink)}.day.today{background:var(--brand);color:var(--paper)}.dashboard{display:grid;grid-template-columns:1fr 1.1fr;gap:32px;align-items:start}.hero{position:relative;background:var(--brand);color:var(--paper);border-radius:24px;padding:30px;overflow:hidden;min-height:330px;display:flex;flex-direction:column;justify-content:center}.hero .watermark{position:absolute;font:180px var(--serif);right:8px;top:-13px;opacity:.1;transform:rotate(-9deg);pointer-events:none}.hero .eyebrow,.hero p{color:#d3dfcd}.hero h2{font-size:29px;font-weight:400;line-height:1.55;position:relative;margin:22px 0 12px}.hero p{font-size:13px;position:relative}.hero button{background:var(--paper);color:var(--brand);width:100%;margin-top:18px;text-align:left;display:flex;justify-content:space-between;font-size:14px;font-weight:500}.section-head{display:flex;align-items:center;justify-content:space-between;margin:22px 0 13px;gap:10px}.section-head:first-child{margin-top:0}.section-head h2{font-size:17px;margin:0}.small,.muted{font-size:12px;color:var(--quiet)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tile{text-align:left;border-radius:18px;padding:20px;min-height:131px}.tile .meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--quiet);margin-bottom:14px}.tile strong{font-size:27px;font-weight:500}.tile small{font-size:12px;color:var(--quiet);font-weight:400}.tile progress{margin-top:12px}.notice{font-size:12px;color:var(--quiet);display:flex;gap:10px;align-items:start;margin:18px 0}.notice svg{flex-shrink:0;margin-top:2px}.soft-card{border-radius:18px;background:var(--soft);padding:22px;display:flex;justify-content:space-between;align-items:center;gap:16px}.soft-card .letter{font:58px var(--serif);opacity:.55}.soft-card p{font-size:12px;margin-bottom:0}.entry{border:1px solid var(--line);background:var(--surface);border-radius:18px;padding:22px;margin:15px 0}.row{display:flex;align-items:center;gap:15px;text-align:left;width:100%;padding:20px 0;border:0;border-bottom:1px solid var(--line);background:transparent;border-radius:0}.row .glyph{display:grid;place-items:center;flex-shrink:0;width:48px;height:51px;background:var(--soft);border-radius:13px;font:27px var(--serif)}.row .copy{flex:1;min-width:0}.row h3{margin:0}.row p{font-size:12px;margin:4px 0 0}.arrow{color:var(--quiet)}.columns{display:grid;grid-template-columns:1fr 1fr;gap:32px}.narrow{max-width:720px;margin:auto}.back{display:flex;align-items:center;gap:6px;border:0;background:transparent;padding:0 0 14px;border-radius:0;color:var(--quiet);font-size:13px}.primary{background:var(--brand);color:var(--paper);border-color:var(--brand)}.primary:hover{background:#3a5f4a}.wide{width:100%;margin-top:18px}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:16px}.actions>*{flex:1}.pill{border-radius:22px;padding:8px 14px;font-size:12px;background:var(--soft);border:0}.pill[aria-pressed="true"]{background:var(--brand);color:var(--paper)}.flash{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;border:1px solid var(--line);border-radius:24px;background:var(--surface);padding:40px 24px;min-height:330px;margin-top:20px;box-shadow:0 10px 30px #253f2c04}.flash .word{font:54px/1.5 var(--serif);letter-spacing:3px;margin:24px 0 5px;overflow-wrap:anywhere}.flash .kana{font-size:16px;letter-spacing:3px;color:var(--quiet)}.answer{border-top:1px solid var(--line);padding-top:24px;margin-top:24px;width:100%;animation:reveal .25s ease}.answer p{color:var(--ink)}.ratings{display:flex;gap:10px;margin-top:18px}.ratings button{flex:1;font-size:13px;padding:14px 4px}.ratings button:last-child{background:var(--soft)}.article{padding:30px;border:1px solid var(--line);border-radius:21px;background:var(--surface);margin:20px 0;font-family:var(--serif);font-size:19px;line-height:2.7;letter-spacing:.025em;line-break:strict;overflow-wrap:break-word}.article p{font-size:inherit;line-height:inherit;color:var(--ink);margin:0 0 15px}.article p:last-child{margin:0}ruby{ruby-position:over;ruby-align:center}rt{font-family:-apple-system,"Yu Gothic",sans-serif;font-size:.55em;line-height:1;letter-spacing:0;color:var(--quiet)}.hide-furigana rt{visibility:hidden}.ja{line-height:2.65;overflow-wrap:anywhere}.reading-tools{display:flex;justify-content:space-between;align-items:center;gap:10px}.question{margin-top:25px;padding-top:20px;border-top:1px solid var(--line)}.question h3{font-size:16px}.question label{display:block;font-size:13px;color:var(--quiet);margin:12px 0 5px}.question .answer{background:var(--soft);padding:20px;border:0;border-radius:14px}.question .answer p{font-size:14px}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:var(--surface);color:var(--ink);font-size:16px;min-width:0}textarea{min-height:100px;resize:vertical}label{display:block;margin:12px 0 6px;font-size:13px}.check{display:flex;align-items:center;gap:8px}.check input{width:18px;height:18px}.connection{background:var(--soft);border-radius:12px;padding:12px;font-size:14px;color:var(--ink)}blockquote{border-left:2px solid var(--accent);margin:23px 0;padding:5px 0 5px 20px;font:22px/1.9 var(--serif)}.statline{display:flex;justify-content:space-between;gap:15px;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}.empty{text-align:center;padding:35px 15px}.seal{width:90px;height:90px;margin:0 auto 24px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;background:var(--soft);font:40px var(--serif)}.empty p{font-size:13px}.empty button{max-width:360px}.history-list{list-style:none;padding:0}.history-list li{padding:15px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:15px}.history-list small{display:block;color:var(--quiet);font-size:11px}.history-list strong{font-weight:500;font-size:14px}audio{width:100%;margin:14px 0}progress{width:100%;height:4px;border:0;border-radius:5px;overflow:hidden;display:block;background:var(--line);accent-color:var(--brand)}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--brand)}.choices{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.result{font-size:12px;color:var(--brand);background:var(--soft);padding:10px 13px;border-radius:10px;margin-top:13px}.center{text-align:center}.login{max-width:440px;margin:20px auto}.login .mark{width:60px;height:60px;font-size:34px;margin-bottom:27px}.login h1{font-size:32px}.error{color:#934432;font-size:13px}.badge{font-size:10px;color:var(--quiet);background:var(--soft);padding:4px 8px;border-radius:8px}.break{overflow-wrap:anywhere}#navigation{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);display:flex;gap:6px;border:1px solid var(--line);background:#fffefbf5;border-radius:22px;padding:8px;box-shadow:0 8px 40px #20382915;z-index:10;backdrop-filter:blur(16px)}#navigation button{border:0;background:transparent;min-width:85px;display:flex;align-items:center;justify-content:center;gap:8px;font-size:12px;color:var(--quiet);border-radius:15px}#navigation button.active{background:var(--soft);color:var(--brand)}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.desktop-footer{display:flex;justify-content:space-between;letter-spacing:1px;font:13px var(--serif);border-top:1px solid var(--line);padding:20px 0 110px;color:var(--quiet)}.desktop-footer span{font:11px sans-serif;letter-spacing:0}#toast{position:fixed;bottom:110px;left:50%;transform:translateX(-50%) translateY(10px);max-width:calc(100% - 30px);background:var(--brand);color:var(--paper);border-radius:14px;padding:12px 20px;font-size:13px;z-index:30;opacity:0;pointer-events:none;transition:.2s}#toast.visible{opacity:1;transform:translateX(-50%) translateY(0)}dialog{border:1px solid var(--line);border-radius:22px;padding:27px;width:min(440px,calc(100% - 32px));background:var(--paper);color:var(--ink)}dialog::backdrop{background:#18322755;backdrop-filter:blur(4px)}.file-input{font-size:13px}.spaced{margin-top:30px}[hidden]{display:none!important}@keyframes reveal{from{opacity:.2;transform:translateY(8px)}to{opacity:1;transform:none}}@media(min-width:900px){.week-dates{margin-bottom:32px}.page-head{max-width:660px}.study-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 38px}}@media(max-width:700px){.shell{padding:0 23px}.chrome{padding:23px 0 20px}.brand{font-size:15px;gap:10px}.mark{width:34px;height:36px;border-radius:10px;font-size:23px}.brand small{font-size:9px}.status{font-size:10px;max-width:148px}main{padding:28px 0 30px}h1{font-size:31px;letter-spacing:-1px}.page-head{margin-bottom:23px}.head-row{display:block}.dashboard,.columns{grid-template-columns:1fr;gap:22px}.week-dates{justify-content:space-between;margin:20px 0}.hero{padding:25px;min-height:270px}.hero h2{font-size:26px;margin:18px 0 8px}.hero .watermark{font-size:150px}.tile{padding:17px;min-height:119px}.tile strong{font-size:24px}.section-head{margin-top:23px}.article{padding:22px;font-size:18px}.entry{padding:18px}.flash{padding:28px 20px;min-height:310px}.flash .word{font-size:49px}.desktop-footer{padding-bottom:110px;margin-top:12px}#navigation{bottom:0;left:0;transform:none;width:100%;justify-content:space-around;border-radius:0;padding:8px 10px calc(9px + env(safe-area-inset-bottom));border-left:0;border-right:0;border-bottom:0}#navigation button{flex:1;min-width:0;display:grid;justify-items:center;gap:4px;font-size:10px;padding:7px}#toast{bottom:calc(92px + env(safe-area-inset-bottom))}.choices{grid-template-columns:repeat(2,1fr)}.ratings{gap:7px}.ratings button{font-size:12px}.day{min-width:32px}.hero button{font-size:13px}}@media(max-width:350px){.shell{padding:0 16px}.article{padding:17px;font-size:17px}.status{max-width:127px}.tile{padding:14px}.brand{font-size:13px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Interaction motion: short feedback, stable reading layout. */
button{position:relative;isolation:isolate;overflow:hidden;transition:background-color .22s,color .22s,border-color .22s,box-shadow .22s,transform .18s}
button:active{transform:scale(.965)}
.tap-wave{position:absolute;left:0;top:0;width:1px;height:1px;border-radius:50%;background:currentColor;pointer-events:none;z-index:0}
button>span:not(.tap-wave),button>svg{position:relative}
#navigation button{transition:background-color .26s,color .26s,transform .18s}
#navigation button.active{box-shadow:inset 0 0 0 1px #294c3c08}
.row .arrow{transition:transform .24s}.row:active .arrow{transform:translateX(4px)}
.pill[aria-pressed]{transition:background-color .25s,color .25s,transform .18s}
rt{transition:opacity .2s,visibility .2s}.hide-furigana rt{opacity:0}
input,textarea,select{transition:border-color .2s,box-shadow .2s,background-color .2s}
input:focus,textarea:focus,select:focus{border-color:#8fa68a;box-shadow:0 0 0 3px #8fa68a18}
.result{animation:feedback-in .46s cubic-bezier(.25,.8,.25,1)}
.question .answer{animation:answer-in .48s cubic-bezier(.25,.8,.25,1)}
dialog[open]{animation:dialog-in .4s cubic-bezier(.25,.8,.25,1)}
dialog[open]::backdrop{animation:veil-in .2s ease}
@media(hover:hover) and (pointer:fine){.tile:hover{transform:translateY(-3px);box-shadow:0 9px 24px #233d3209;border-color:#c6d3be}.row:hover .arrow{transform:translateX(4px)}.hero button:hover{transform:translateY(-2px);box-shadow:0 6px 18px #10271918}}
@keyframes feedback-in{from{opacity:0;transform:translateY(6px) scale(.985)}to{opacity:1;transform:none}}
@keyframes answer-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes dialog-in{from{opacity:0;transform:translateY(16px) scale(.97)}to{opacity:1;transform:none}}
@keyframes veil-in{from{opacity:0}to{opacity:1}}
@media(prefers-reduced-motion:reduce){button,.tile:hover,.hero button:hover,button:active{transform:none!important}.tap-wave{display:none}*,*::before,*::after{animation:none!important;transition:none!important}}

.listen-player{position:sticky;top:0;z-index:4;background:var(--paper);padding:16px 0 12px;border-bottom:1px solid var(--line);margin-bottom:28px}
.listen-player audio{display:block;width:100%;height:54px;margin:10px 0 0}.listen-player .actions{margin-top:8px;gap:8px}.listen-player .actions button{font-size:12px;padding:8px 10px}.listen-player p{margin:8px 0 0;font-size:11px}
.listening-work{margin:24px 0}.listen-heading{display:flex;justify-content:space-between;align-items:center;gap:10px}.listen-heading h2{margin:6px 0 0}.listen-count{font-size:11px;white-space:nowrap;color:var(--quiet)}
.listen-dots{display:flex;gap:9px;margin:23px 0 25px}.listen-dots button{flex:1;min-width:0;padding:9px 0;border-radius:14px;background:transparent;font-size:13px;position:relative}.listen-dots .answered:after{content:'';position:absolute;bottom:4px;left:calc(50% - 2px);width:4px;height:4px;border-radius:50%;background:var(--brand)}.listen-dots [aria-current="step"]{background:var(--brand);color:var(--paper);border-color:var(--brand);box-shadow:0 5px 14px #294c3c18}.listen-dots [aria-current="step"]:after{background:var(--paper)}
.listen-stage{overflow:hidden}.listen-question-heading{display:flex;align-items:center;gap:15px;margin-bottom:18px}.listen-number{font:42px/1 var(--serif);color:#8a9c80}.listen-question-heading h3{margin:0;font-size:16px}.listen-question-heading p{margin:4px 0 0;font-size:12px}
.listen-options{display:grid;gap:10px}.listen-option{position:relative;display:flex;align-items:center;gap:12px;min-height:66px;margin:0;padding:15px 16px;border:1px solid var(--line);border-radius:17px;background:#fffefb70;cursor:pointer;transition:background .24s,border-color .24s,box-shadow .24s,transform .2s;color:var(--ink);font-size:16px;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.listen-option input{position:absolute;width:1px;height:1px;opacity:0;padding:0;min-width:0}.listen-option:has(:focus-visible){outline:3px solid #759376;outline-offset:3px}.listen-option:active{transform:scale(.985)}.listen-option:has(:checked){background:#e5eddc;border-color:#809876;box-shadow:0 3px 12px #294c3c08}.option-number{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--soft);flex-shrink:0;font:14px sans-serif}.listen-option:has(:checked) .option-number{background:var(--brand);color:var(--paper)}.option-text{flex:1;line-height:2.1;overflow-wrap:anywhere}.option-check{opacity:0;transform:scale(.6);transition:opacity .22s,transform .22s;font-size:15px}.listen-option:has(:checked) .option-check{opacity:1;transform:scale(1)}.listen-option.is-correct{border-color:#809876;background:#e5eddc}.listen-option.is-wrong{border-color:#c49c81;background:#f4e9de}
.listen-pagination{display:flex;justify-content:space-between;align-items:center;margin:22px 0;gap:10px}.listen-pagination button{font-size:12px;background:transparent}.listen-pagination button:disabled{cursor:default;opacity:.3}.listening-work>.check{font-size:12px}.listen-result{margin:18px 0 0;padding:12px 15px;border-radius:12px;background:var(--soft);font-size:13px;color:var(--brand);animation:reveal .28s ease}
.listen-figure{display:block;width:100%;background:#edf0e5;border:0;border-radius:18px;padding:14px;margin:0 0 16px}.listen-figure img{display:block;max-height:285px;width:auto;max-width:100%;height:auto;margin:auto;mix-blend-mode:multiply}.listen-figure span{display:block;margin-top:7px;font-size:11px;color:var(--quiet)}.image-options{grid-template-columns:1fr 1fr}.image-options .listen-option{padding:10px;min-height:55px;gap:8px}.image-options .option-text{letter-spacing:4px}.image-options .option-check{display:none}
.listen-image-dialog{width:min(780px,calc(100% - 24px));max-height:90dvh;padding:15px;background:var(--paper);overflow:auto}.listen-image-dialog button{display:block;margin-left:auto;margin-bottom:12px}.listen-image-dialog img{display:block;width:100%;height:auto;mix-blend-mode:multiply}
.listen-summary{border-top:1px solid var(--line);padding:24px 0;animation:reveal .3s ease}.listen-notes{border-top:1px solid var(--line);margin-top:30px;padding-top:18px}.listen-notes summary{cursor:pointer;display:flex;justify-content:space-between;font-size:15px;list-style:none}.listen-notes summary::-webkit-details-marker{display:none}.listen-notes summary span{font-size:12px;color:var(--quiet)}.listen-notes[open] .listen-notes-body{animation:reveal .3s ease}.listen-notes-body{padding-top:24px}.listen-notes .actions a{font-size:12px}
@media(max-width:400px){.listen-heading h2{font-size:19px}.listen-option{padding:12px;gap:9px;font-size:15px}.listen-player .actions button{font-size:11px;padding:7px 5px}.listen-dots{gap:6px}.listen-figure img{max-height:230px}}
@media(prefers-reduced-motion:reduce){.listen-option:active{transform:none}}

/* Keep app controls from behaving like selectable webpage text. */
button,
.brand,
.chrome,
#navigation,
.back,
.badge,
.status,
.card-sync {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

/* Learning material and form content must remain selectable and copyable. */
.flash .word,
.flash .kana,
.flash .answer,
.article,
.article *,
.question h3,
.question .answer,
.question .answer *,
blockquote,
input,
textarea,
select {
  -webkit-user-select: text;
  user-select: text;
  -webkit-touch-callout: default;
}
/* Flashcards keep the frequent controls within the available screen. */
.card-focus .chrome,.card-focus .desktop-footer,.card-focus #navigation{display:none}
.card-focus main{padding:12px 0;min-height:0;height:100vh;height:100dvh;padding-top:max(12px,env(safe-area-inset-top));padding-bottom:max(8px,env(safe-area-inset-bottom))}
.card-session{height:100%;display:flex;flex-direction:column;max-width:560px;gap:8px}
.card-session>.back{flex:none;min-height:40px;padding:0;font-size:13px}
.card-session>.section-head{margin:0;flex:none}
.card-session>progress{flex:none}
.card-session .flash{flex:1;min-height:0;margin:4px 0 0;padding:0;overflow:hidden}
.card-content{width:100%;max-height:100%;overflow-y:auto;overscroll-behavior:contain;padding:20px;scrollbar-width:thin}
.card-session .word{font-size:clamp(32px,7vh,50px);margin:8px 0 2px;line-height:1.35;letter-spacing:2px}
.card-session .kana{font-size:14px;letter-spacing:2px}
.card-session .answer{margin-top:12px;padding-top:12px}
.card-session .answer h2{font-size:19px;margin-bottom:6px}
.card-session .answer p{font-size:14px;line-height:1.6;margin:6px 0}
.card-session .answer p.small{font-size:12px}
.card-controls{flex:none;display:flex;flex-direction:column;gap:8px}
.card-controls .ratings,.card-controls .wide,.card-controls .actions{margin:0}
.card-controls .ratings button,.card-controls>.wide{min-height:48px;padding:10px 4px}
.card-controls .actions button{min-height:44px;padding:8px}
.card-sync{border:0;background:transparent;padding:0 8px;min-height:28px;font-size:11px;line-height:1.4;color:var(--quiet)}
.card-focus #toast{bottom:140px}
@media(max-height:650px){.card-session{gap:5px}.card-content{padding:12px 16px}.card-session .word{font-size:36px}.card-session .answer{margin-top:8px;padding-top:8px}.card-session .answer p{margin:4px 0}.card-session .eyebrow{font-size:9px;letter-spacing:1px}.card-controls{gap:5px}}
.detail-page .chrome,.detail-page .desktop-footer{display:none}
.detail-page:not(.card-focus) main{padding-top:max(20px,env(safe-area-inset-top));padding-bottom:calc(110px + env(safe-area-inset-bottom))}
/* A bounded app surface avoids pulling the document into an empty backdrop. */
html,body{height:100%;overflow:hidden;overscroll-behavior:none;background:var(--paper)}
.shell{height:100%;height:100dvh;overflow-y:auto;overflow-x:hidden;overscroll-behavior:none;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.card-focus .shell{overflow:hidden}
.chrome-ghost{z-index:20;pointer-events:none!important;background:var(--surface);overflow:hidden;border-radius:18px;display:flex!important;align-items:center;justify-content:space-around;gap:6px;padding:8px}
.chrome-ghost button{border:0;background:transparent;display:grid;justify-items:center;gap:4px;font-size:11px;min-width:60px}
.chrome-ghost .active{background:var(--soft)}
@media(prefers-reduced-motion:reduce){.chrome-ghost{display:none!important}}
.ratings button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-width:0}
.ratings button small{font-size:10px;color:var(--quiet);font-weight:400}
.card-controls .ratings{gap:6px}
.card-controls .ratings button{font-size:12px;min-height:56px;line-height:1.35}
@media(max-width:350px){.card-controls .ratings{gap:4px}.card-controls .ratings button{font-size:11px;padding:8px 2px}}

/* Continuous grammar lessons keep actions reachable while the text scrolls. */
.grammar-focus #navigation{display:none}
.grammar-controls{position:fixed;bottom:0;left:0;width:100%;z-index:10;background:var(--paper);border-top:1px solid var(--line);padding:12px 16px calc(12px + env(safe-area-inset-bottom));animation:feedback-in .44s ease}
.grammar-controls>div{display:flex;gap:8px;max-width:720px;margin:auto}
.grammar-controls .primary{flex:1}
.grammar-controls button{font-size:13px;padding:10px}
.grammar-session>progress{margin-bottom:22px}
.grammar-focus #toast{bottom:100px}
.grammar-overview{padding:22px;border:1px solid var(--line);border-radius:22px;background:var(--soft);margin:22px 0}
.grammar-overview .wide{margin-top:12px}.grammar-overview p{margin:14px 0 0}
.drill-overview{background:var(--soft);padding:24px;border-radius:24px;margin:24px 0}
.drill-stats{display:flex;justify-content:space-between;gap:12px;margin:20px 0;color:var(--quiet);font-size:12px}
.drill-stats span{display:grid;gap:4px}.drill-stats strong{font:25px var(--serif);color:var(--ink)}
.drill-guide summary{padding:14px 0;cursor:pointer}.drill-guide p{padding:0 12px}
.drill-passage{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:22px;font:20px/2.65 var(--serif);overflow-wrap:anywhere;margin:24px 0}
.drill-gap{display:inline-block;min-width:46px;text-align:center;background:var(--soft);border-radius:9px;text-decoration:none;scroll-margin-top:20px}
.drill-blank{scroll-margin-top:24px;padding:22px 0;border-bottom:1px solid var(--line)}
.drill-blank>label{display:block;margin-bottom:12px}.drill-blank input,.drill-blank select{font-size:16px;width:100%;min-height:48px}
.drill-blank input[type=checkbox]{width:auto;min-height:0}.drill-blank input:focus{scroll-margin-bottom:110px}
.drill-answer{background:var(--soft);border-radius:16px;margin-top:16px;padding:18px}.drill-answer p[lang=ja]{font-size:20px;line-height:2.5;color:var(--ink)}
.drill-hint{padding:14px;background:#eee8d8;border-radius:14px;font-size:13px}
#drill-form>.primary{margin-top:20px;position:sticky;bottom:12px;box-shadow:0 4px 18px #233d3220}
.drill-exercise h1{font-size:29px}.drill-exercise .check{margin:18px 0}.drill-exercise .check input{width:auto}
@media(max-width:350px){.drill-passage{padding:18px;font-size:18px}.drill-overview{padding:18px}.drill-stats strong{font-size:22px}}
.grammar-position{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:14px 0 10px;font-size:13px}
.grammar-position strong{font-weight:500;color:var(--quiet)}
.grammar-lesson{padding:26px;margin-bottom:22px}.grammar-lesson>h2{font:30px/1.6 var(--serif);margin:8px 0 24px}
.grammar-lesson>h3{font-size:13px;font-weight:600;color:var(--quiet);margin:22px 0 8px}
.grammar-lesson p{overflow-wrap:anywhere}.grammar-lesson blockquote{line-height:2.6;margin:22px 0 12px;padding-left:18px}
.grammar-study-footer{margin-top:25px}.grammar-study-footer p{margin-top:12px}
.grammar-prompt{padding:28px 24px;border:1px solid var(--line);border-radius:22px;background:var(--surface)}
.grammar-prompt .ja{font:23px/2.5 var(--serif);color:var(--ink);margin:24px 0}.grammar-prompt h2{font-size:17px;line-height:1.8}
.grammar-answer{border-left:3px solid var(--accent);padding:18px 22px;margin:26px 0;background:var(--soft);border-radius:0 18px 18px 0}
.grammar-answer>p{color:var(--ink)}.grammar-answer>p.small{color:var(--quiet)}
.grammar-explanation summary{cursor:pointer;padding:14px 0;color:var(--quiet)}
.grammar-controls .ratings{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));width:100%;gap:6px;margin:0}
.grammar-controls .ratings button{font-size:12px;padding:10px 3px;min-height:62px;line-height:1.4}
.grammar-controls .grammar-recall-nav{display:flex;align-items:center;justify-content:space-between;margin-top:8px;gap:8px}
.grammar-recall-nav button{border:0;background:transparent;font-size:12px;padding:4px 8px;min-height:36px}
.grammar-recall-nav span{font-size:11px;flex:1;text-align:center}
.grammar-focus main:has(.grammar-recall){padding-bottom:calc(180px + env(safe-area-inset-bottom))}
@media(max-width:400px){.grammar-lesson,.grammar-prompt{padding:20px 18px}.grammar-lesson>h2{font-size:27px}.grammar-prompt .ja{font-size:21px}.grammar-overview{padding:18px}.grammar-controls .ratings button{font-size:11px}}

.drill-context{font-size:15px;line-height:2.6;color:var(--quiet);padding:12px 14px;background:var(--soft);border-radius:12px}

.mark,.hero .watermark,.soft-card .letter,.seal{font-family:"LearningHub Decorative",var(--serif);font-weight:400;font-synthesis:none}