@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=DM+Sans:wght@400;500;600;700&display=swap');
:root{color-scheme:light;--green:#234e3e;--muted:#717b70;--line:#dce0d5}*{box-sizing:border-box}body{margin:0;background:#f5f5ed;color:#24362b;font-family:'DM Sans',Arial,sans-serif}button,input,select{font:inherit}button{cursor:pointer;transition:background .18s}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #c69a48;outline-offset:4px}header{max-width:1120px;margin:auto;padding:25px 32px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.brand{text-decoration:none;color:var(--green);font-weight:700;letter-spacing:2px;display:flex;align-items:center;gap:10px}.brand span{display:grid;place-items:center;width:38px;height:38px;background:var(--green);color:white;border-radius:9px;font-size:24px}.brand b{font-size:11px;background:#e2e9d6;padding:5px 7px;border-radius:5px}.header-note,.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700}main{max-width:1040px;padding:0 32px;margin:auto}.intro{display:flex;justify-content:space-between;align-items:center;padding:44px 0 30px;gap:24px}.eyebrow{color:#7d8b65;margin-top:0}h1{font-size:clamp(30px,4vw,46px);line-height:1.12;letter-spacing:-1.8px;margin:14px 0}p{line-height:1.6}.intro p:last-child{font-size:14px;color:var(--muted);max-width:430px}.intro aside{min-width:210px;padding:22px;border-left:1px solid var(--line)}aside strong{display:block;font-size:40px;color:var(--green)}aside span{font-size:12px;color:var(--muted)}progress{display:block;width:100%;height:6px;margin-top:14px;accent-color:var(--green)}.filters{display:grid;grid-template-columns:1.4fr 1fr .8fr;gap:14px}label{font-size:11px;color:#626f61;font-weight:600}input,select{display:block;width:100%;margin-top:7px;background:#fff;border:1px solid var(--line);border-radius:9px;padding:12px;color:#293c30;font-size:13px;min-width:0}.deck-top{display:flex;align-items:center;justify-content:space-between;margin:22px 0 10px;font-size:12px;color:var(--muted)}button{border:1px solid var(--line);background:white;padding:12px 18px;border-radius:9px;color:var(--green);font-weight:600;font-size:13px}button:hover{background:#eaf0e3}.quiet{background:transparent;border:0;padding:8px}#card{background:#fffefb;border:1px solid #d7ddcf;border-radius:18px;box-shadow:0 10px 35px #223a2910;overflow:hidden}.card-head,.card-foot{display:flex;align-items:center;justify-content:space-between;padding:19px 25px;font-size:11px;color:var(--muted)}.card-head{border-bottom:1px solid #eff0e9}.card-head span:first-child{color:var(--green);background:#edf1e6;border-radius:20px;padding:7px 12px}.card-foot{border-top:1px solid #eff0e9}.card-foot button{background:var(--green);color:white;border:0}.kanji{font-family:'Noto Sans JP','Yu Gothic','Meiryo',sans-serif}.hero-kanji{font-size:110px;line-height:1.4;text-align:center;margin:8px 0 15px;font-weight:500}.front{padding:18px 60px 35px;min-height:325px}.words{display:grid;grid-template-columns:1fr 1fr;grid-auto-flow:column;grid-template-rows:repeat(4,auto);gap:14px 42px;max-width:600px;margin:auto;text-align:center;font-size:24px}.back{padding:25px;display:grid;grid-template-columns:1fr 1.1fr;gap:35px}.back h2{font-size:66px;font-weight:500;margin:0;line-height:1.3}.readings{font-size:14px;line-height:1.9;margin:8px 0}.readings b{font-family:Arial;font-size:10px;display:inline-block;width:35px;color:var(--muted)}.meaning{font-size:19px;font-weight:700;margin:10px 0 18px}.section-label{font-size:10px;letter-spacing:1.4px;color:var(--muted);font-weight:700}.components{display:flex;flex-wrap:wrap;align-items:center;gap:9px;border-top:1px solid var(--line);padding-top:18px}.part{text-align:center;background:#eff3e9;border-radius:9px;padding:9px;min-width:48px;flex:1}.part strong{display:block;font-size:27px;font-weight:500}.part small{display:block;font-size:10px}.plus{color:#8a9982}.story{margin-top:20px;padding:17px;background:#f5f0df;border-left:3px solid #b49b55;border-radius:0 8px 8px 0}.story p{font-size:13px;margin-bottom:0;line-height:1.8}.vocab-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px 18px;margin-top:22px}.vocab-item{min-width:0}.vocab-item .kanji{font-size:20px;line-height:1.9;overflow-wrap:anywhere}rt{font-size:10px}.vocab-item p{font-size:12px;color:#65705f;margin:3px 0}.controls{display:flex;justify-content:space-between;gap:12px;margin-top:18px}#mark{background:#e5eddb;border-color:#d3dfc7}#mark[aria-pressed=true]{background:var(--green);color:white}.hint{text-align:center;font-size:11px;color:#87917e;margin:20px 0 35px}.hint span{display:block}footer{display:flex;justify-content:space-between;padding:22px 0;border-top:1px solid var(--line);font-size:10px;color:#7f8978}footer span{letter-spacing:1px}#empty{text-align:center;padding:70px 20px;border:1px dashed var(--line);border-radius:15px}[hidden]{display:none!important}@media(max-width:650px){header{padding:17px 20px}.header-note{display:none}main{padding:0 17px}.intro{padding:27px 0 20px}.intro aside{display:none}.filters{grid-template-columns:1fr 1fr}.filters label:first-child{grid-column:1/-1}.front{padding:18px 20px 30px}.hero-kanji{font-size:90px}.words{font-size:21px;gap:14px}.card-head,.card-foot{padding:15px}.back{grid-template-columns:1fr;gap:20px;padding:20px}.controls{gap:7px}.controls button{font-size:11px;padding:11px 9px}footer span{display:none}}
/* A single-screen study desk. Card content fits the available space. */
html,body{height:100%;overflow:hidden}body{height:100dvh;display:flex;flex-direction:column}header{width:100%;max-width:960px;padding:10px 24px;flex:none}.brand span{width:30px;height:30px;font-size:21px}main{width:100%;max-width:960px;min-height:0;flex:1;display:flex;flex-direction:column;padding:12px 24px}.intro{display:none}.filters{gap:10px;flex:none}label{font-size:10px}input,select{padding:8px 10px;margin-top:4px;font-size:12px}.deck-top{margin:8px 0 6px;flex:none}.quiet{padding:4px 8px}#card{width:100%;max-width:840px;align-self:center;flex:1;min-height:0;max-height:620px;display:flex;flex-direction:column;transform-origin:center;will-change:transform}.card-head,.card-foot{padding:9px 16px;flex:none}.card-head span:first-child{padding:5px 9px}.card-foot button{padding:8px 14px}#content{flex:1;min-height:0;overflow:hidden;display:flex;justify-content:center;align-items:center}.front{min-height:0;padding:12px 22px 20px;flex:none}.hero-kanji{font-size:88px;margin:0 0 16px}.words{font-size:23px;gap:12px 38px}.back{padding:15px 20px;grid-template-columns:1fr 1.12fr;gap:24px;flex:none}.back h2{font-size:55px}.readings{font-size:13px;line-height:1.65;margin:5px 0}.meaning{font-size:17px;margin:7px 0 12px}.components{gap:5px;padding-top:12px}.part{padding:6px 4px;min-width:0}.part strong{font-size:25px}.part small{font-size:10px;overflow-wrap:anywhere}.story{padding:10px 12px;margin-top:12px}.story p{font-size:12px;line-height:1.6;margin:7px 0 0}.vocab-grid{gap:16px 13px;margin-top:18px}.vocab-item .kanji{font-size:19px;line-height:1.75}.vocab-item p{font-size:11px;line-height:1.5}.controls{width:100%;max-width:840px;align-self:center;margin-top:10px;flex:none}.controls button{padding:9px 13px}.hint{margin:8px 0 0;flex:none}.hint span{display:none}footer{display:none}#empty{flex:1}.header-note{font-size:9px}@media(min-height:850px){main{justify-content:center}.filters,.deck-top{width:100%;max-width:840px;align-self:center}}@media(max-width:650px){header{padding:8px 14px}main{padding:8px 12px}.filters{grid-template-columns:1.15fr 1fr 1fr;gap:6px}.filters label:first-child{grid-column:auto}label{font-size:9px}input,select{font-size:11px;padding:7px 6px}.back{grid-template-columns:1fr 1.12fr;gap:18px}.card-head{font-size:10px;padding:8px 10px}.card-head span:first-child{max-width:76%}.card-foot{padding:8px 12px}.controls button{padding:8px;font-size:10px}.hint{font-size:9px}.header-note{display:block;font-size:8px;letter-spacing:1px}.front{padding:12px 20px}.hero-kanji{font-size:85px}.words{font-size:23px}}
@media(max-height:500px){header{padding:5px 14px}.brand span{height:24px;width:24px}.hint{display:none}.deck-top{margin:3px 0}.card-head,.card-foot{padding:5px 12px}.controls{margin-top:5px}.filters label{font-size:0}input,select{margin:0}.card-head span:first-child{padding:3px 7px}}
.deck-actions{display:flex;align-items:center;gap:10px}.stats-open{display:flex;align-items:center;gap:6px}.stats-open b{font-size:11px;color:var(--green);margin-left:4px}.stats-open svg{width:24px;height:24px;transform:rotate(-90deg);overflow:visible}.mini-base,.mini-value{fill:none;stroke-width:4}.mini-base{stroke:#e1cba8}.mini-value{stroke:var(--green);stroke-dasharray:100;stroke-dashoffset:100;transition:stroke-dashoffset .7s ease}.hint{font-size:10px}#card{touch-action:pan-y pinch-zoom}#content{user-select:none;-webkit-user-select:none}dialog{border:1px solid #d8dfcf;border-radius:22px;width:min(440px,calc(100vw - 28px));max-height:calc(100dvh - 32px);padding:24px;background:#fffefb;color:#24362b;box-shadow:0 20px 80px #0f2b3333;overflow:auto}dialog::backdrop{background:#19372b66;backdrop-filter:blur(4px)}.stats-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.stats-heading h2{font-size:22px;letter-spacing:-.7px;margin:6px 0 0}.stats-heading .eyebrow{font-size:9px;margin:0}.stats-heading button{font-size:20px}.stats-picker{display:block}.donut-wrap{position:relative;width:190px;height:190px;margin:18px auto 14px}.donut-wrap svg{width:100%;height:100%;transform:rotate(-90deg)}.donut-base,.donut-value{fill:none;stroke-width:18}.donut-base{stroke:#e1cba8}.donut-value{stroke:#2e6850;stroke-dasharray:100;stroke-dashoffset:100;stroke-linecap:butt}.donut-center{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;pointer-events:none}.donut-center strong{font-size:34px;letter-spacing:-1.5px}.donut-center span{font-size:11px;color:var(--muted);margin-top:2px}.stats-numbers{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:12px;padding:12px}.stats-numbers>div{display:flex;align-items:center;flex-direction:column;gap:3px}.stats-numbers>div+div{border-left:1px solid var(--line)}.stats-numbers span{font-size:12px}.stats-numbers strong{font-size:28px}.stats-numbers small{font-size:10px;color:var(--muted)}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:5px}.known{background:#2e6850}.unknown{background:#e1cba8}.stats-total{font-size:12px;text-align:center;font-weight:600;margin:13px 0 7px}.stats-note{font-size:10px;color:var(--muted);line-height:1.6;margin:0}.progress-transfer{margin-top:18px;padding-top:13px;border-top:1px solid var(--line);font-size:11px}.progress-transfer summary{cursor:pointer;font-weight:600;line-height:1.5}.progress-transfer p{color:var(--muted);font-size:11px}.progress-transfer>div{display:flex;gap:8px}.progress-transfer button,.import-button{padding:9px 12px;border:1px solid var(--line);border-radius:8px;font-size:11px;background:white;cursor:pointer;color:var(--green);font-weight:600;position:relative}.import-button input{position:absolute;inset:0;opacity:0;width:100%;margin:0;cursor:pointer}#transferStatus:empty{display:none}@media(max-width:420px){.deck-actions{gap:3px}.stats-open span{font-size:11px}.hint{font-size:8px}dialog{padding:18px}.donut-wrap{width:160px;height:160px;margin:12px auto}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}}