:root{--ink:#17201d;--muted:#64706b;--paper:#f5f7f3;--line:#d9dfda;--green:#176b4d;--green-soft:#e2f0e8;--coral:#d85f47;--yellow:#f1c75b;--blue:#3979a9;--white:#fff}*{box-sizing:border-box}html{background:var(--paper)}body{background:var(--paper);color:var(--ink);letter-spacing:0;margin:0;font-family:Arial,Noto Sans KR,Yu Gothic,sans-serif}.app-shell{background:var(--paper);max-width:760px;min-height:100dvh;margin:auto;padding-bottom:84px}.topbar{border-bottom:1px solid var(--line);z-index:10;background:#f5f7f3f5;justify-content:space-between;align-items:center;height:82px;padding:16px 20px 10px;display:flex;position:sticky;top:0}.eyebrow{color:var(--coral);margin:0 0 3px;font-size:11px;font-weight:700}.topbar h1{margin:0;font-size:22px}.streak{color:var(--ink);background:0 0;border:0;flex-direction:column;align-items:flex-end;padding:4px;display:flex}.streak b{font-size:18px}.streak span{color:var(--muted);font-size:10px}button,input,textarea{font:inherit;letter-spacing:0}button{cursor:pointer}.content{padding:16px 18px}.selectors{gap:12px;display:grid}.segment{border:1px solid var(--line);background:var(--white);border-radius:6px;grid-template-columns:repeat(4,1fr);padding:3px;display:grid}.segment button{color:var(--muted);background:0 0;border:0;border-radius:4px;padding:9px;font-weight:700}.segment button.active{background:var(--ink);color:#fff}.kind-row{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.kind-row button{border:1px solid var(--line);background:var(--white);height:56px;color:var(--muted);border-radius:6px;justify-content:center;align-items:center;gap:6px;font-size:12px;font-weight:700;display:flex}.kind-row button span{font-family:Yu Mincho,serif;font-size:20px}.kind-row button.active{border-color:var(--green);color:var(--green);background:var(--green-soft)}.study-view{margin-top:16px}.session-line{color:var(--muted);justify-content:space-between;align-items:center;margin-bottom:10px;font-size:12px;display:flex}.session-line label{align-items:center;gap:5px;display:flex}.session-line input{accent-color:var(--green)}.study-card{background:var(--white);border:1px solid var(--line);border-top:4px solid var(--green);border-radius:8px;flex-direction:column;min-height:310px;padding:16px 20px;display:flex}.study-card.kanji{border-top-color:var(--coral)}.study-card.grammar{border-top-color:var(--yellow)}.study-card.reading{border-top-color:var(--blue)}.card-meta{color:var(--muted);align-items:center;gap:7px;font-size:11px;display:flex}.card-meta span:first-child{background:var(--ink);color:#fff;border-radius:3px;padding:3px 6px}.card-meta span:last-child{margin-left:auto}.japanese{text-align:center;overflow-wrap:anywhere;margin:auto 0 20px;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:clamp(34px,10vw,58px);font-weight:700;line-height:1.35}.reading .japanese{text-align:left;font-size:clamp(22px,6vw,34px)}.reveal-space{border-top:1px solid var(--line);min-height:102px;padding-top:13px}.reveal-space p{grid-template-columns:88px 1fr;gap:6px;margin:0 0 10px;display:grid}.reveal-space small{color:var(--muted);font-size:11px}.reveal-space b{overflow-wrap:anywhere;font-size:15px}.reveal-space .prompt{text-align:center;color:#8b948f;padding-top:18px;font-size:13px;display:block}.reveal-space .example span{color:var(--muted);grid-column:2;font-size:12px}.reveal-buttons{grid-template-columns:repeat(4,1fr);gap:7px;margin-top:10px;display:grid}.reveal-buttons button{border:1px solid var(--line);background:var(--white);min-height:42px;color:var(--muted);border-radius:6px;padding:5px;font-size:12px;font-weight:700}.reveal-buttons button.on{border-color:var(--green);background:var(--green-soft);color:var(--green)}.memo{border-bottom:1px solid var(--line);margin-top:10px}.memo summary{color:var(--muted);cursor:pointer;padding:9px 2px;font-size:12px}.memo summary span{float:right;color:var(--green)}.memo textarea{border:1px solid var(--line);resize:vertical;background:#fff;border-radius:6px;width:100%;min-height:72px;padding:10px}.grade-buttons{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px;display:grid}.grade-buttons button{border:1px solid var(--line);height:60px;color:var(--ink);background:#fff;border-radius:6px;flex-direction:column;justify-content:center;align-items:center;display:flex}.grade-buttons b{font-size:14px}.grade-buttons span{color:var(--muted);margin-top:3px;font-size:10px}.grade-buttons .master{background:var(--green);border-color:var(--green);color:#fff}.grade-buttons .master span{color:#d9eee5}.empty{text-align:center;border:1px solid var(--line);background:#fff;border-radius:8px;margin-top:10px;padding:70px 20px}.empty p{color:var(--muted);font-size:13px}.empty button,.more{background:var(--green);color:#fff;border:0;border-radius:6px;padding:11px 16px}.list-view,.progress-view{margin-top:18px}.search input{border:1px solid var(--line);background:#fff;border-radius:6px;width:100%;height:46px;padding:0 13px}.filters{gap:6px;margin:10px 0;display:flex}.filters button{border:1px solid var(--line);color:var(--muted);background:#fff;border-radius:5px;padding:7px 11px;font-size:12px}.filters button.active{background:var(--ink);border-color:var(--ink);color:#fff}.result-count{color:var(--muted);font-size:12px}.word-list{border-top:1px solid var(--line)}.word-list button{text-align:left;border:0;border-bottom:1px solid var(--line);background:0 0;grid-template-columns:10px minmax(100px,1fr) 1.5fr;align-items:center;gap:9px;width:100%;padding:13px 3px;display:grid}.word-list button>span:nth-child(2){flex-direction:column;gap:3px;display:flex}.word-list b{font-size:17px}.word-list small,.word-list em{color:var(--muted);font-size:11px;font-style:normal}.dot{background:#bdc5c0;border-radius:50%;width:7px;height:7px}.dot.learning{background:var(--yellow)}.dot.mastered{background:var(--green)}.more{margin:18px auto;display:block}.progress-head{background:var(--ink);color:#fff;border-radius:8px;padding:20px}.progress-head p{color:#bdc9c4;margin:0;font-size:12px}.progress-head strong{margin:8px 0;font-size:42px;display:block}.progress-head>div{background:#44504b;border-radius:4px;height:7px;overflow:hidden}.progress-head i,.level-progress i{background:var(--yellow);height:100%;display:block}.progress-head>span{text-align:right;color:#bdc9c4;margin-top:7px;font-size:11px;display:block}.stats{grid-template-columns:repeat(3,1fr);gap:8px;margin:10px 0 24px;display:grid}.stats div{border:1px solid var(--line);text-align:center;background:#fff;border-radius:6px;padding:14px}.stats b{font-size:18px;display:block}.stats span{color:var(--muted);font-size:11px}.progress-view h2{margin:20px 0 8px;font-size:15px}.level-progress{border-top:1px solid var(--line)}.level-progress button{border:0;border-bottom:1px solid var(--line);background:0 0;grid-template-columns:35px 1fr 38px;align-items:center;gap:10px;width:100%;padding:15px 2px;display:grid}.level-progress span{background:#dde2de;border-radius:4px;height:7px;overflow:hidden}.level-progress em{color:var(--muted);font-size:12px;font-style:normal}.backup{grid-template-columns:1fr 1fr;gap:8px;display:grid}.backup h2{grid-column:1/-1}.backup button{border:1px solid var(--line);background:#fff;border-radius:6px;padding:11px}.backup .danger{color:#a63f31}.bottom-nav{border-top:1px solid var(--line);z-index:20;width:min(760px,100%);height:70px;padding-bottom:env(safe-area-inset-bottom);background:#fffffff7;grid-template-columns:repeat(3,1fr);display:grid;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.bottom-nav button{color:var(--muted);background:0 0;border:0;flex-direction:column;justify-content:center;align-items:center;gap:3px;font-size:11px;font-weight:700;display:flex}.bottom-nav span{font-family:Yu Mincho,serif;font-size:19px}.bottom-nav button.active{color:var(--green)}.loading{text-align:center;min-height:100dvh;color:var(--muted);place-content:center;gap:15px;display:grid}.loader{border:3px solid var(--line);border-top-color:var(--green);border-radius:50%;width:30px;height:30px;margin:auto;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width>=720px){.content{padding:20px 32px}.study-card{min-height:350px}.japanese{margin-bottom:32px}.topbar{padding-inline:32px}}@media (width<=390px){.content{padding-inline:12px}.reveal-buttons{grid-template-columns:repeat(2,1fr)}.study-card{padding-inline:14px}.grade-buttons span{display:none}.word-list button{grid-template-columns:9px 1fr}.word-list em{grid-column:2}}.login-button,.account-chip{display:none!important}.top-actions{align-items:center;display:flex}.reveal-space .example strong{color:var(--ink);border-left:3px solid var(--green);background:var(--green-soft);border-radius:0 4px 4px 0;grid-column:2;padding:7px 9px;font-size:13px;font-weight:700}.ad-slot{border-top:1px solid var(--line);min-height:100px;margin:24px 0 8px;padding-top:16px;overflow:hidden}.ad-slot>span{color:var(--muted);text-align:center;margin-bottom:5px;font-size:9px;display:block}.site-info{border-top:1px solid var(--line);margin-top:24px}.site-info details{border-bottom:1px solid var(--line)}.site-info summary{color:var(--muted);cursor:pointer;padding:13px 2px;font-size:12px}.site-info p{color:var(--muted);margin:0 0 14px;font-size:11px;line-height:1.65}.info-link{color:var(--green);margin:0 0 14px;font-size:11px;font-weight:700;display:inline-block}@media (width<=430px){.topbar{padding-inline:14px}.topbar h1{font-size:20px}}