@import"https://fonts.googleapis.com/css2?family=Zen+Maru+Gothic:wght@400;500;700;900&display=swap";:root{--bg:#fff7f9;--panel:#ffffff;--ink:#2b2340;--muted:#7a6f8f;--line:#f1d9e2;--sakura:#ff8fb1;--sakura-soft:#ffe3ec;--indigo:#4b3f9e;--indigo-soft:#ebe8ff;--hanko:#d7263d;--ok:#2e9d6a;--ok-soft:#e1f6ec;--warn:#e08a00;--warn-soft:#fff2db;--shadow:0 6px 20px rgba(75,63,158,.1)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#16131f;--panel:#211c2e;--ink:#f1ecff;--muted:#a79dc0;--line:#352d49;--sakura:#ff8fb1;--sakura-soft:#3a2230;--indigo:#a99cff;--indigo-soft:#2a2545;--hanko:#ff5468;--ok:#5fd39b;--ok-soft:#1b3328;--warn:#ffb547;--warn-soft:#3a2d14;--shadow:0 6px 20px rgba(0,0,0,.35)}}:root[data-theme=dark]{--bg:#16131f;--panel:#211c2e;--ink:#f1ecff;--muted:#a79dc0;--line:#352d49;--sakura:#ff8fb1;--sakura-soft:#3a2230;--indigo:#a99cff;--indigo-soft:#2a2545;--hanko:#ff5468;--ok:#5fd39b;--ok-soft:#1b3328;--warn:#ffb547;--warn-soft:#3a2d14;--shadow:0 6px 20px rgba(0,0,0,.35)}*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--ink);font-family:Zen Maru Gothic,system-ui,sans-serif;line-height:1.6;background-image:radial-gradient(circle at 10% 0%,var(--sakura-soft) 0,transparent 35%),radial-gradient(circle at 100% 30%,var(--indigo-soft) 0,transparent 30%);background-attachment:fixed}header{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.wrap{max-width:1100px;margin:0 auto;padding:0 16px}.top{display:flex;align-items:center;gap:12px;padding:10px 0}.logo{font-weight:900;font-size:1.25rem;display:flex;align-items:center;gap:8px}.logo .neko{font-size:1.6rem}.logo small{font-weight:500;color:var(--muted);font-size:.8rem}.spacer{flex:1}nav{display:flex;gap:6px;overflow-x:auto;padding-bottom:8px;scrollbar-width:none}nav button{flex:0 0 auto;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:999px;padding:6px 14px;font:inherit;cursor:pointer}nav button.active{background:var(--indigo);color:#fff;border-color:var(--indigo)}.iconbtn{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:10px;padding:6px 10px;cursor:pointer;font:inherit}main{padding:20px 0 80px}section.tab{display:none}section.tab.active{display:block}h1,h2,h3{line-height:1.3;margin:.2em 0 .5em}h2{font-size:1.4rem;display:flex;align-items:center;gap:10px}h2 .jp{background:var(--hanko);color:#fff;border-radius:8px;padding:2px 8px;font-size:1rem;transform:rotate(-4deg);display:inline-block}.card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow);margin-bottom:16px}.muted{color:var(--muted)}.grid{display:grid;gap:16px}@media(min-width:860px){.grid.two{grid-template-columns:1fr 1fr}}table{width:100%;border-collapse:collapse}th{color:var(--muted);font-weight:500;font-size:.85rem}.tablewrap{overflow-x:auto}.ja{font-size:1.08rem}.pill{display:inline-block;border-radius:999px;padding:1px 10px;font-size:.8rem;background:var(--indigo-soft);color:var(--indigo)}.flag{background:var(--warn-soft);border-left:4px solid var(--warn);padding:10px 12px;border-radius:10px;margin:10px 0}.ok{color:var(--ok);font-weight:700}.bad{color:var(--hanko);font-weight:700}.timerbox{display:grid;gap:12px}@media(min-width:860px){.timerbox{grid-template-columns:340px 1fr}}.clock{text-align:center;padding:18px;border-radius:18px;background:linear-gradient(135deg,var(--indigo),#7b5cff);color:#fff;box-shadow:var(--shadow)}.clock .now{font-size:.95rem;opacity:.9}.clock .big{font-size:3.6rem;font-weight:900;letter-spacing:2px;font-variant-numeric:tabular-nums}.clock.over{background:linear-gradient(135deg,var(--hanko),#ff7a59)}.clock .controls{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:8px}.clock button{border:0;border-radius:12px;padding:8px 14px;font:inherit;cursor:pointer;background:#fff3;color:#fff}.clock button.primary{background:#fff;color:var(--indigo);font-weight:700}.bar{height:8px;background:#ffffff40;border-radius:99px;overflow:hidden;margin-top:10px}.bar>i{display:block;height:100%;background:#fff;width:0}.sections{list-style:none;margin:0;padding:0}.sections li{display:grid;grid-template-columns:72px 1fr auto;gap:10px;padding:10px;border-radius:12px;cursor:pointer;border:1px solid transparent}.sections li:hover{background:var(--indigo-soft)}.sections li.cur{background:var(--sakura-soft);border-color:var(--sakura)}.sections li.done{opacity:.55}.sections .t{font-variant-numeric:tabular-nums;color:var(--muted)}.sections .notes{font-size:.9rem;color:var(--muted)}.pairsel{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap}.pairsel button{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:12px;padding:6px 12px;cursor:pointer;font:inherit}.pairsel button.active{background:var(--sakura);border-color:var(--sakura);color:#fff}.pages{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.pages figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:zoom-in}.pages img{width:100%;display:block}.pages figcaption{font-size:.8rem;padding:4px 8px;color:var(--muted)}.lightbox{position:fixed;inset:0;background:#0a0814e0;display:none;align-items:center;justify-content:center;z-index:50;padding:12px}.lightbox.open{display:flex}.lightbox img{max-width:100%;max-height:100%;border-radius:8px;background:#fff}.lightbox .nav{position:absolute;top:50%;transform:translateY(-50%);font-size:2rem;color:#fff;background:none;border:0;cursor:pointer;padding:12px}.lightbox .prev{left:4px}.lightbox .next{right:4px}.flash{min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;border-radius:20px;background:var(--panel);border:2px solid var(--sakura);box-shadow:var(--shadow);cursor:pointer;padding:20px;-webkit-user-select:none;user-select:none}.flash .front{font-size:2.6rem;font-weight:700}.flash .reading{font-size:1.2rem;color:var(--muted);min-height:1.6em}.flash .meaning{font-size:1.3rem;color:var(--indigo);min-height:1.8em}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.btn{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:12px;padding:8px 14px;font:inherit;cursor:pointer}.btn.primary{background:var(--indigo);color:#fff;border-color:var(--indigo)}.btn.sakura{background:var(--sakura);color:#fff;border-color:var(--sakura)}.choices{display:grid;gap:10px;grid-template-columns:1fr}@media(min-width:600px){.choices{grid-template-columns:1fr 1fr}}.choices button{border:2px solid var(--line);background:var(--panel);color:var(--ink);border-radius:14px;padding:12px;font:inherit;font-size:1.1rem;cursor:pointer;text-align:left}.choices button.right{border-color:var(--ok);background:var(--ok-soft)}.choices button.wrong{border-color:var(--hanko);background:color-mix(in srgb,var(--hanko) 12%,transparent)}.q{font-size:1.3rem;margin:8px 0 14px}.score{font-weight:900;font-size:1.1rem}.stamp{display:inline-block;border:3px solid var(--hanko);color:var(--hanko);border-radius:50%;width:88px;height:88px;line-height:82px;text-align:center;font-weight:900;font-size:1.4rem;transform:rotate(-12deg)}.kbd{font-family:ui-monospace,monospace;font-size:.8rem;border:1px solid var(--line);border-radius:6px;padding:0 5px}.mail{white-space:pre-wrap;font-size:1.1rem;line-height:2}mark.g1{background:color-mix(in srgb,var(--sakura) 35%,transparent);color:inherit;border-radius:4px;padding:0 2px}mark.g2{background:color-mix(in srgb,var(--indigo) 25%,transparent);color:inherit;border-radius:4px;padding:0 2px}mark.req{background:color-mix(in srgb,var(--ok) 25%,transparent);color:inherit;border-radius:4px;padding:0 2px}footer{color:var(--muted);font-size:.8rem;text-align:center;padding:20px}.plain mark{background:none!important;padding:0}.questions li{margin-bottom:8px}.q-actions{display:inline-flex;gap:6px;margin-left:8px;vertical-align:middle}.btn.tiny{padding:2px 10px;font-size:.8rem;border-radius:999px}.answer{margin-top:4px;padding:6px 10px;border-left:3px solid var(--ok);background:var(--ok-soft);border-radius:8px}.img-ph{aspect-ratio:3/4;display:flex;align-items:center;justify-content:center;color:var(--muted)}details{border:1px dashed var(--line);border-radius:12px;padding:8px 12px;margin:8px 0}summary{cursor:pointer;color:var(--indigo);font-weight:500}th,td{text-align:left;padding:8px;border-bottom:1px solid var(--line);vertical-align:top}button,select,input,textarea{font:inherit}button{color:inherit}button:disabled{opacity:.5;cursor:not-allowed}.shell{min-height:100vh}.top .logo{white-space:nowrap}.login-card{max-width:560px;margin:12vh auto;text-align:center}.login-card .neko{font-size:3rem}.login-button{margin:12px auto;background:var(--indigo);color:#fff;border:0;border-radius:12px;padding:11px 18px;cursor:pointer}.error{color:var(--hanko)}.pending{border-left:4px solid var(--warn);padding:10px;background:var(--warn-soft);border-radius:8px}.sections li{list-style:none}.teacher-notes{white-space:pre-wrap}.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.pairsel button{color:var(--ink)}.form-control{border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);padding:8px 10px}.reader{font-size:1.1rem;line-height:2}.vocab-face{font-size:2.4rem;text-align:center;padding:35px 12px}.mobile-scroll{overflow-x:auto}.whiteboard{padding:10px}.whiteboard .canvas{height:min(72vh,760px);min-height:420px;border:1px solid var(--line);border-radius:12px;overflow:hidden}@media(max-width:520px){.wrap{padding-left:12px;padding-right:12px}.top{flex-wrap:wrap}.top .spacer{flex:1}.clock .big{font-size:3rem}.sections li{grid-template-columns:55px 1fr auto;gap:6px;padding:8px 4px}}