.lab-html{-webkit-text-size-adjust:100%;background:#eef3f0}
.lab-body{
  --lab-bg:#eef3f0;--lab-panel:#fbfdfc;--lab-panel-2:#f3f7f5;--lab-ink:#172723;--lab-sub:#60716c;
  --lab-line:#d4dfda;--lab-green:#2b6b59;--lab-green-deep:#1d5143;--lab-mint:#dcece6;--lab-warm:#c45e3c;
  --lab-warm-soft:#f5dfd7;--lab-focus:#e18d32;--lab-shadow:0 16px 46px rgba(28,69,57,.09);
  margin:0;min-height:100svh;background:
    radial-gradient(circle at 12% 0%,rgba(103,174,151,.15),transparent 34rem),var(--lab-bg);
  color:var(--lab-ink);font-family:"Apple SD Gothic Neo","Malgun Gothic","Yu Gothic UI",system-ui,sans-serif;
}
.lab-body *{box-sizing:border-box}
.lab-body button,.lab-body input{font:inherit}
.lab-body button{color:inherit}
.lab-app{width:min(100% - 32px,920px);margin:0 auto;padding:28px 0 36px}
.lab-header{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:start;margin-bottom:26px}
.lab-back{grid-column:1/-1;width:max-content;color:var(--lab-green-deep);font-size:.84rem;font-weight:700;text-decoration:none;padding:4px 0}
.lab-back:hover{text-decoration:underline;text-underline-offset:3px}
.lab-brand h1{font-size:clamp(1.55rem,5vw,2.25rem);letter-spacing:-.035em;margin:5px 0 7px;line-height:1.1}
.lab-brand p{color:var(--lab-sub);font-size:.91rem;line-height:1.55;margin:0}
.lab-kicker{display:inline-block;color:var(--lab-green);font-size:.72rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase}
.lab-online{align-self:center;border:1px solid var(--lab-line);border-radius:999px;color:var(--lab-sub);font-size:.7rem;padding:6px 10px;white-space:nowrap;background:var(--lab-panel)}
.lab-main{outline:none}
.lab-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr);gap:16px}
.lab-stack{display:grid;gap:16px}
.lab-card{background:var(--lab-panel);border:1px solid var(--lab-line);border-radius:18px;padding:20px;box-shadow:var(--lab-shadow)}
.lab-today{background:linear-gradient(135deg,var(--lab-green-deep),var(--lab-green));color:#fff;border:0;padding:24px}
.lab-card-label{font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--lab-sub);margin:0 0 8px}
.lab-today .lab-card-label{color:rgba(255,255,255,.72)}
.lab-countdown{font-size:.8rem;color:rgba(255,255,255,.8);margin:0 0 22px}
.lab-today h2{font-size:clamp(1.45rem,4vw,2rem);letter-spacing:-.04em;margin:0 0 8px}
.lab-today-summary{margin:0;color:rgba(255,255,255,.82);font-size:.88rem;line-height:1.55}
.lab-primary,.lab-secondary,.lab-grade,.lab-choice,.lab-scenario{
  border:0;border-radius:12px;cursor:pointer;min-height:46px;font-weight:750;transition:transform .15s,filter .15s,border-color .15s;
}
.lab-primary{width:100%;background:#fff;color:var(--lab-green-deep)!important;margin-top:22px;padding:13px 18px}
.lab-primary:hover,.lab-secondary:hover,.lab-grade:hover,.lab-choice:hover,.lab-scenario:hover{transform:translateY(-1px);filter:brightness(.98)}
.lab-secondary{background:var(--lab-green);color:#fff!important;padding:12px 17px}
.lab-secondary[disabled],.lab-primary[disabled]{opacity:.48;cursor:not-allowed;transform:none}
.lab-link-button{border:0;background:none;color:var(--lab-green);font-weight:750;cursor:pointer;padding:7px 0;text-decoration:underline;text-underline-offset:3px}
.lab-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:18px}
.lab-metric{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.13);border-radius:12px;padding:10px;text-align:center}
.lab-metric b{display:block;font-size:1.15rem;font-variant-numeric:tabular-nums}
.lab-metric span{font-size:.66rem;color:rgba(255,255,255,.72)}
.lab-section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:13px}
.lab-section-head h2,.lab-section-head h3{font-size:1rem;margin:0;letter-spacing:-.02em}
.lab-section-head p{font-size:.72rem;color:var(--lab-sub);margin:0}
.lab-scenario-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.lab-scenario{display:flex;text-align:left;align-items:center;gap:10px;padding:12px;background:var(--lab-panel-2);border:1px solid var(--lab-line)}
.lab-scenario-icon{font-size:1.25rem}
.lab-scenario-copy{min-width:0}
.lab-scenario-copy b{display:block;font-size:.86rem}
.lab-scenario-copy span{display:block;font-size:.68rem;color:var(--lab-sub);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:3px}
.lab-progress-row{display:flex;justify-content:space-between;gap:12px;font-size:.8rem;color:var(--lab-sub);margin:10px 0 6px}
.lab-bar{height:8px;border-radius:99px;background:var(--lab-mint);overflow:hidden}
.lab-bar-fill{height:100%;background:var(--lab-green);border-radius:inherit}
.lab-note{font-size:.77rem;line-height:1.6;color:var(--lab-sub);margin:14px 0 0}
.lab-quiz-callout{display:flex;gap:14px;align-items:center}
.lab-quiz-glyphs{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:2rem;color:var(--lab-warm);letter-spacing:-.18em;white-space:nowrap;padding-right:.18em}
.lab-quiz-copy{flex:1}
.lab-quiz-copy h3{margin:0 0 4px;font-size:.95rem}
.lab-quiz-copy p{margin:0;color:var(--lab-sub);font-size:.73rem;line-height:1.45}
.lab-runner{width:min(100%,680px);margin:0 auto}
.lab-runner-top{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px}
.lab-runner-top button{border:0;background:none;color:var(--lab-sub);cursor:pointer;padding:8px 0;font-weight:700}
.lab-runner-progress{font-size:.76rem;color:var(--lab-sub);font-variant-numeric:tabular-nums}
.lab-runner-bar{height:5px;background:var(--lab-line);border-radius:99px;margin-bottom:17px;overflow:hidden}
.lab-runner-bar span{display:block;height:100%;background:var(--lab-green);border-radius:inherit;transition:width .2s}
.lab-study-card{min-height:380px;display:flex;flex-direction:column;justify-content:center;text-align:center;padding:clamp(22px,6vw,44px)}
.lab-prompt-label{font-size:.74rem;color:var(--lab-sub);font-weight:750;letter-spacing:.06em;margin:0 0 24px}
.lab-word{font-family:"Yu Mincho","Hiragino Mincho ProN","Noto Serif JP",serif;font-size:clamp(2.4rem,11vw,4.8rem);line-height:1.18;color:var(--lab-green-deep);overflow-wrap:anywhere;margin:0}
.lab-meaning-front{font-size:clamp(1.6rem,6vw,2.6rem);line-height:1.35;letter-spacing:-.04em;margin:0}
.lab-context{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(1.65rem,6vw,2.5rem);line-height:1.45;margin:0;color:var(--lab-green-deep)}
.lab-answer{border-top:1px solid var(--lab-line);margin-top:30px;padding-top:24px}
.lab-answer[hidden],.lab-grades[hidden]{display:none}
.lab-answer-main{font-size:1.1rem;font-weight:800;margin:0 0 7px;line-height:1.45}
.lab-answer-sub{font-size:.82rem;color:var(--lab-sub);line-height:1.6;margin:0}
.lab-answer-ja{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:1.5rem;color:var(--lab-green-deep);margin:0 0 6px}
.lab-reveal{margin-top:30px;width:100%}
.lab-grades{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-top:14px}
.lab-grade{padding:12px 8px;border:1px solid var(--lab-line);background:var(--lab-panel)}
.lab-grade span{display:block;font-size:.67rem;font-weight:500;color:var(--lab-sub);margin-top:3px}
.lab-grade-again{border-color:#dfb4a7;color:#9b3e27}
.lab-grade-hard{border-color:#dfc997;color:#85641d}
.lab-grade-good{border-color:#9fc8b9;color:var(--lab-green-deep)}
.lab-shortcuts{text-align:center;color:var(--lab-sub);font-size:.68rem;margin:12px 0 0}
.lab-done{text-align:center;padding:clamp(28px,7vw,54px)}
.lab-done-mark{display:grid;place-items:center;width:64px;height:64px;border-radius:50%;background:var(--lab-mint);color:var(--lab-green);font-size:1.7rem;margin:0 auto 18px}
.lab-done h2{font-size:1.5rem;margin:0 0 8px}
.lab-done p{color:var(--lab-sub);line-height:1.6;font-size:.86rem;margin:0}
.lab-done-actions{display:flex;justify-content:center;gap:9px;margin-top:22px;flex-wrap:wrap}
.lab-quiz{width:min(100%,650px);margin:0 auto}
.lab-quiz-card{text-align:center;padding:clamp(24px,7vw,48px)}
.lab-quiz-index{color:var(--lab-sub);font-size:.76rem;margin:0 0 22px}
.lab-quiz-target{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:5.5rem;line-height:1;margin:0 0 30px;color:var(--lab-green-deep)}
.lab-choices{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
.lab-choice{background:var(--lab-panel-2);border:1px solid var(--lab-line);padding:13px}
.lab-choice-correct{background:var(--lab-mint);border-color:var(--lab-green)}
.lab-choice-wrong{background:var(--lab-warm-soft);border-color:var(--lab-warm)}
.lab-settings{width:min(100%,640px);margin:0 auto}
.lab-settings h2{margin:0 0 8px}
.lab-settings-lead{color:var(--lab-sub);font-size:.83rem;line-height:1.6;margin:0 0 20px}
.lab-settings-section{padding:18px 0;border-top:1px solid var(--lab-line)}
.lab-settings-section h3{font-size:.92rem;margin:0 0 6px}
.lab-settings-section p{font-size:.76rem;color:var(--lab-sub);line-height:1.55;margin:0 0 12px}
.lab-settings-actions{display:flex;gap:8px;flex-wrap:wrap}
.lab-file{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.lab-danger{color:#9b3e27!important;background:var(--lab-warm-soft)!important;border:1px solid #dfb4a7!important}
.lab-storage-warning{border-radius:12px;padding:12px 14px;background:var(--lab-warm-soft);color:#803923;font-size:.78rem;line-height:1.5;margin-bottom:14px}
.lab-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:25px;padding-top:18px;border-top:1px solid var(--lab-line);color:var(--lab-sub);font-size:.72rem}
.lab-footer p{margin:0}
.lab-text-button{border:0;background:none;color:var(--lab-green);font-weight:750;cursor:pointer;padding:5px}
.lab-sr{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.lab-noscript{padding:20px;text-align:center}
.lab-body :focus-visible{outline:3px solid var(--lab-focus);outline-offset:3px}
@media (max-width:720px){
  .lab-grid{grid-template-columns:1fr}.lab-stack{grid-template-columns:1fr 1fr}.lab-card{border-radius:15px}.lab-study-card{min-height:350px}
}
@media (max-width:520px){
  .lab-app{width:min(100% - 24px,920px);padding-top:18px}.lab-header{margin-bottom:18px}.lab-online{font-size:.64rem;padding:5px 8px}
  .lab-stack{grid-template-columns:1fr}.lab-scenario-grid{grid-template-columns:1fr 1fr}.lab-scenario{padding:10px}.lab-scenario-copy span{display:none}
  .lab-card{padding:16px}.lab-today{padding:20px}.lab-study-card{min-height:330px;padding:24px 18px}.lab-word{font-size:clamp(2.2rem,15vw,3.8rem)}
  .lab-grades{gap:6px}.lab-grade{font-size:.81rem}.lab-shortcuts{display:none}.lab-footer{align-items:flex-start;flex-direction:column}.lab-choices{grid-template-columns:1fr 1fr}
}
@media (max-width:370px){.lab-scenario-grid{grid-template-columns:1fr}.lab-metrics{gap:5px}.lab-metric{padding:8px 4px}.lab-grade span{font-size:.61rem}}
@media (prefers-color-scheme:dark){
  .lab-html{background:#111a18}.lab-body{
    --lab-bg:#111a18;--lab-panel:#192521;--lab-panel-2:#202f2a;--lab-ink:#e7f0ed;--lab-sub:#9aafa8;--lab-line:#30453e;
    --lab-green:#62ad94;--lab-green-deep:#a5d5c5;--lab-mint:#24493d;--lab-warm:#e38a6c;--lab-warm-soft:#4a2c23;--lab-focus:#f0ad60;
    --lab-shadow:0 16px 46px rgba(0,0,0,.2)
  }
  .lab-primary{background:#f3faf7}.lab-grade-again{color:#f0a38c}.lab-grade-hard{color:#e7c56f}.lab-danger{color:#f0a38c!important}
}
@media (prefers-reduced-motion:reduce){.lab-primary,.lab-secondary,.lab-grade,.lab-choice,.lab-scenario,.lab-runner-bar span{transition:none}}