:root{--ink: #1c2333;--ink-2: #4a5468;--muted: #6b7486;--line: #e2e6ee;--bg: #f5f7fb;--card: #ffffff;--brand: #22408f;--brand-ink: #ffffff;--brand-soft: #e8edfa;--ok: #1f7a4d;--ok-soft: #e6f4ec;--warn: #9a5b00;--warn-soft: #fff4e0;--danger: #b42318;--danger-soft: #fdecea;--radius: 14px;--tap: 48px;--font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;--font-en: "Helvetica Neue", Arial, "Noto Sans", sans-serif;color-scheme:light}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);color:var(--ink);background:var(--bg);font-size:16px;line-height:1.7;-webkit-text-size-adjust:100%}[lang=en]{font-family:var(--font-en)}h1{font-size:1.5rem;line-height:1.35;margin:.25rem 0 1rem;font-weight:700;letter-spacing:.01em}h2{font-size:1.1rem;margin:0 0 .75rem;font-weight:700}p{margin:.25rem 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#cfd5e1;border-radius:12px;background:#fff;color:var(--ink)}textarea.writing{min-height:220px;line-height:1.6;resize:vertical;font-size:1rem}.counter{text-align:right}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:8px}.seg{display:flex;align-items:center;justify-content:center;min-height:var(--tap);border:1px solid var(--line);border-radius:12px;cursor:pointer;font-weight:700;padding:8px;text-align:center}.seg input{position:absolute;opacity:0;pointer-events:none}.seg-on{border-color:var(--brand);background:var(--brand-soft);color:var(--brand)}.signin{min-height:100vh;display:grid;place-items:center;padding:16px}.signin-card{width:100%;max-width:420px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px 22px;display:grid;gap:10px}.signin-title{margin:8px 0 0}.student-list{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:12px}.student-card{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0}.student-name{font-weight:800;font-size:1.15rem}.facts{display:grid;gap:10px;margin:0}.facts>div{display:flex;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--line);padding-bottom:8px}.facts>div:last-child{border-bottom:0;padding-bottom:0}.facts dt{color:var(--ink-2);flex:none;max-width:60%}.facts dd{margin:0;font-weight:700;text-align:right}.rules{margin:0;padding-left:1.2rem;display:grid;gap:6px}.notice{border-radius:var(--radius);padding:14px 16px;margin:0 0 16px;border:1px solid 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0}.skills{width:100%;border-collapse:collapse}.skills th,.skills td{padding:10px 4px;border-bottom:1px solid var(--line);text-align:left}.skills tr:last-child th,.skills tr:last-child td{border-bottom:0}.skills .num{font-family:var(--font-en);font-weight:800;text-align:right}.spinner{width:32px;height:32px;border-radius:50%;border:3px solid var(--brand-soft);border-top-color:var(--brand);animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(min-width:720px){h1{font-size:1.75rem}.page{padding:24px}}