:root{
  --bg:#f4f6f8;--card:#fff;--ink:#151922;--muted:#747b86;--line:#e3e7ec;
  --accent:#121826;--soft:#edf0f4;--good:#1f7a4c;--bad:#a23b4b;
  --shadow:0 10px 34px rgba(18,24,38,.07);
  font-family:Inter,Pretendard,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box} html{background:var(--bg)} body{margin:0;background:var(--bg);color:var(--ink)}
button,input,select,textarea{font:inherit}button{cursor:pointer}.app{max-width:760px;margin:auto;min-height:100vh;padding:0 18px calc(88px + env(safe-area-inset-bottom))}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:20px 2px 14px}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--muted);font-weight:800}.brand{font-weight:900;font-size:20px;letter-spacing:-.03em;margin-top:3px}
.view{display:none}.view.active{display:block}h2{font-size:18px;margin:0;letter-spacing:-.02em}.small{font-size:12px}.muted{color:var(--muted)}
.hero{background:var(--accent);color:#fff;padding:20px;border-radius:24px;box-shadow:var(--shadow)}.hero-row{display:flex;justify-content:space-between;gap:18px;align-items:center}.hero-kicker{font-size:12px;color:#cbd0d8}.level-line{display:flex;align-items:center;gap:8px;margin-top:7px;font-size:25px;font-weight:900}.badge-dark{display:inline-flex;background:#242c3d;color:#fff;border-radius:999px;padding:6px 9px;font-size:11px;font-weight:800}.streak{text-align:right}.streak b{font-size:25px}.streak span{display:block;color:#cbd0d8;font-size:11px}.xp-line{display:flex;justify-content:space-between;font-size:11px;color:#d5d9df;margin:18px 0 7px}.xpbar{height:8px;background:#2c3445;border-radius:999px;overflow:hidden}.xpbar i{display:block;height:100%;background:#fff;border-radius:999px;transition:width .3s}
.section-head{display:flex;justify-content:space-between;align-items:end;margin:22px 2px 12px}.metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.metric{background:var(--card);border:1px solid var(--line);padding:15px;border-radius:18px}.metric span{display:block;font-size:12px;color:var(--muted)}.metric strong{font-size:26px;margin-top:6px;display:inline-block}.metric em{font-style:normal;font-size:11px;color:var(--muted);margin-left:3px}
.focus-card,.status-card,.capture-card,.utility-card,.chart-card,.analysis-card,.done-card,.form-card{background:var(--card);border:1px solid var(--line);border-radius:19px;padding:18px;margin-top:12px}.focus-card{display:flex;justify-content:space-between;gap:14px;align-items:center}.focus-title{font-weight:900}.focus-copy{font-size:13px;color:var(--muted);margin-top:5px;line-height:1.55}.status-card{display:grid;gap:12px}.status-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:10px}.status-row:last-child{border-bottom:0;padding-bottom:0}
.primary,.secondary,.ghost{border:0;border-radius:13px;min-height:44px;padding:0 15px;font-weight:800}.primary{background:var(--accent);color:#fff}.secondary{background:var(--soft);color:var(--ink)}.ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}.small{min-height:34px;padding:0 11px}.compact{min-height:38px}.wide{width:100%}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.pill{background:var(--soft);border-radius:999px;padding:6px 10px;font-size:11px}.study-actions{display:grid;gap:10px}.mode-card{border:1px solid var(--line);background:var(--card);border-radius:18px;padding:17px;text-align:left;box-shadow:0 2px 10px rgba(18,24,38,.02)}.mode-card b{display:block;font-size:15px}.mode-card span{display:block;color:var(--muted);font-size:12px;margin-top:5px}
.study-card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:21px;box-shadow:var(--shadow);min-height:500px;transition:transform .2s}.session-top{display:flex;justify-content:space-between}.combo{font-size:11px;font-weight:900;color:var(--muted)}.instruction{text-align:center;color:var(--muted);font-size:12px;margin-top:28px}.question{min-height:150px;display:flex;align-items:center;justify-content:center;text-align:center;font-weight:900;font-size:clamp(28px,7vw,42px);letter-spacing:-.03em;line-height:1.3}.timer{text-align:center;color:var(--muted);font-size:12px;margin-bottom:18px}.choices{display:grid;gap:9px;margin-bottom:12px}.choice{border:1px solid var(--line);background:var(--card);border-radius:14px;padding:14px;text-align:left;font-weight:800}.choice.good{border-color:#86b99d;background:#eef8f2}.choice.bad{border-color:#d8a2aa;background:#fff1f3}.answer{border-top:1px solid var(--line);margin-top:15px;padding-top:16px}.answer-jp{font-size:28px;font-weight:900}.answer-reading{color:var(--muted);font-size:12px}.answer-ko{font-size:17px;margin-top:7px}.example{background:var(--bg);border-radius:13px;padding:12px;margin:12px 0;line-height:1.6;font-size:13px}.feedback{text-align:center;min-height:22px;font-size:12px;font-weight:800}.grade-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.grade-grid button{border:0;background:var(--soft);border-radius:13px;min-height:52px;font-weight:800}.grade-grid span{display:block;color:var(--muted);font-size:10px;margin-top:2px}
.done-card{text-align:center}.done-icon{width:54px;height:54px;margin:0 auto 10px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#fff;font-size:26px}.done-card p{color:var(--muted);line-height:1.65}
.toolbar{display:grid;grid-template-columns:1fr 120px;gap:8px;margin-bottom:12px}input,select,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:13px;padding:12px 13px;outline:none;color:var(--ink)}input:focus,textarea:focus,select:focus{border-color:#929aa6;box-shadow:0 0 0 3px rgba(18,24,38,.04)}textarea{resize:vertical}.list{display:grid;gap:9px}.word-card,.weak-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:14px}.word-top{display:flex;justify-content:space-between;gap:12px}.word-jp{font-weight:900;font-size:20px}.word-reading{font-size:11px;color:var(--muted);margin-top:2px}.word-meaning{margin-top:7px}.tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.tag{background:var(--soft);border-radius:999px;padding:5px 8px;font-size:10px;color:#535b68}.card-actions{display:flex;gap:5px}.mini{border:0;background:var(--soft);border-radius:9px;min-height:32px;padding:0 8px;font-size:11px}.danger{color:var(--bad)}
.capture-card textarea{margin-top:7px}.field-label{font-size:13px;font-weight:900}.hint{font-size:11px;color:var(--muted);line-height:1.6;margin:8px 0 12px}.preview-list{display:grid;gap:7px;margin-top:12px}.preview-item{background:var(--bg);border-radius:12px;padding:11px}.preview-item b{font-size:15px}.preview-item span{display:block;font-size:11px;color:var(--muted);margin-top:3px}.manual-details{margin-top:14px}.manual-details summary{font-weight:900;cursor:pointer;padding:14px 4px}.form-card{display:grid;gap:11px}.form-card label{font-size:12px;font-weight:800;display:grid;gap:6px}.utility-card p{font-size:12px;color:var(--muted);line-height:1.6}.file-button{display:flex;align-items:center;justify-content:center}
.chart-card{margin-top:12px}.chart-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.week-chart{height:160px;display:grid;grid-template-columns:repeat(7,1fr);gap:7px;align-items:end}.day-col{height:100%;display:grid;grid-template-rows:1fr auto auto;gap:5px;align-items:end;text-align:center}.day-wrap{height:110px;display:flex;align-items:end;justify-content:center}.day-bar{width:66%;min-height:4px;background:var(--accent);border-radius:7px 7px 2px 2px}.day-value{font-size:10px;font-weight:900}.day-label{font-size:9px;color:var(--muted)}
.line-chart{height:150px;position:relative;border-bottom:1px solid var(--line);border-left:1px solid var(--line);overflow:hidden}.line-chart svg{width:100%;height:100%}
.ability-list{display:grid;gap:12px}.ability-row{display:grid;grid-template-columns:100px 1fr 40px;align-items:center;gap:8px;font-size:12px}.ability-track{height:9px;background:var(--soft);border-radius:999px;overflow:hidden}.ability-track i{display:block;height:100%;background:var(--accent);border-radius:999px}.ability-row strong{text-align:right}
.analysis-list{display:grid;gap:9px}.analysis-item{background:var(--bg);border-radius:13px;padding:12px;font-size:12px;line-height:1.55}.analysis-item b{display:block;margin-bottom:2px}
.jlpt-row{display:grid;grid-template-columns:36px 1fr 46px;gap:9px;align-items:center;margin:9px 0;font-size:12px}.jlpt-track{height:8px;background:var(--soft);border-radius:999px;overflow:hidden}.jlpt-track i{display:block;height:100%;background:var(--accent);border-radius:999px}
.bottom-nav{position:fixed;left:50%;bottom:0;transform:translateX(-50%);width:min(760px,100%);height:calc(68px + env(safe-area-inset-bottom));padding:7px 9px env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-top:1px solid var(--line);z-index:20}.nav-btn{border:0;background:transparent;border-radius:11px;color:#9298a2;font-size:10px;font-weight:800}.nav-btn span{display:block;font-size:18px}.nav-btn.active{background:#f1f3f6;color:var(--ink)}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:var(--accent);color:#fff;border-radius:999px;padding:10px 14px;font-size:12px;z-index:40;box-shadow:var(--shadow)}
.pop{animation:pop .32s ease}.shake{animation:shake .34s ease}@keyframes pop{50%{transform:scale(1.018)}}@keyframes shake{20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}@media(min-width:700px){.metric-grid{grid-template-columns:repeat(4,1fr)}.app{padding-left:28px;padding-right:28px}}