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.15s,box-shadow .15s,transform .1s}.otp-box.filled{border-color:var(--brand)}.otp-box:focus{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft);transform:translateY(-1px)}.otp-box:disabled{opacity:.6}input:disabled{background:var(--chip);color:var(--muted);cursor:not-allowed}.otp-error .otp-box{border-color:var(--danger)}.otp-error{animation:.3s otp-shake}@keyframes otp-shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}.otp-msg{text-align:center;color:var(--danger);margin-top:12px;font-size:13.5px;font-weight:600}@media (max-width:400px){.otp-grid{gap:6px}.otp-box{border-radius:12px;font-size:20px}}@media (prefers-reduced-motion:reduce){.otp-error{animation:none}.otp-box:focus{transform:none}}.hint{color:#3730a3;text-align:center;background:#eef2ff;border:1px dashed #c7d2fe;border-radius:12px;padding:10px 12px;font-size:13px}.seg{background:var(--chip);border-radius:var(--r-md);gap:4px;padding:4px;display:flex}.seg button{border-radius:var(--r-sm);color:var(--muted);cursor:pointer;background:0 0;border:0;flex:1;padding:10px;font-family:inherit;font-size:14px;font-weight:600;transition:all .15s}.seg button.active{color:var(--ink);box-shadow:var(--shadow-sm);background:#fff;font-weight:700}.avatar{color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));border-radius:50%;flex:none;justify-content:center;align-items:center;width:38px;height:38px;font-weight:700;line-height:1;display:flex}.student-row{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:14px;align-items:center;gap:10px;margin-bottom:8px;padding:12px;display:flex}.student-row.active{border-color:var(--brand);background:#f5f3ff}.overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:30;background:#11132280;align-items:flex-end;display:flex;position:fixed;inset:0}.sheet{background:#fff;border-radius:28px 28px 0 0;width:100%;max-height:88%;padding:18px 18px 24px;overflow:auto;box-shadow:0 -10px 40px #14152b2e}.grab{background:var(--line);border-radius:99px;width:40px;height:4px;margin:2px auto 14px}@media (min-width:820px){.overlay{justify-content:center;align-items:center;padding:24px}.sheet{max-width:520px;box-shadow:var(--shadow-lg);border-radius:24px}.grab{display:none}}.toast{inset-inline:0;color:#fff;z-index:50;opacity:0;pointer-events:none;text-align:center;width:max-content;max-width:80%;box-shadow:var(--shadow-md);background:#14152b;border-radius:14px;margin-inline:auto;padding:12px 18px;font-size:13px;font-weight:600;transition:all .25s;position:fixed;bottom:92px}.toast.show{opacity:1;bottom:100px}@media (min-width:820px){.toast.show{bottom:32px}}.kv{border-bottom:1px solid var(--line);justify-content:space-between;padding:7px 0;font-size:14px;display:flex}.kv:last-child{border-bottom:0}.empty{text-align:center;color:var(--muted);padding:40px 10px}.empty .gly{font-size:36px}.topbar{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.nbadge{top:-1px;background:var(--danger);color:#fff;border-radius:999px;justify-content:center;align-items:center;min-width:16px;height:16px;padding:0 4px;font-size:10px;font-weight:700;display:flex;position:absolute;inset-inline-end:-1px}.bar{background:var(--chip);border-radius:99px;height:8px;margin-top:10px;overflow:hidden}.bar>div{height:100%}.btn,.pill,.chip,.badge,.lang-btn,.seg button,.tab,.link-btn{justify-content:center;align-items:center;line-height:1.25;display:inline-flex}.btn{width:100%}.btn.sm,.btn.ghost{width:auto}.tab{flex-direction:column}.ladder{flex-wrap:wrap;gap:4px;margin-top:10px;display:flex}.ladder .rung{background:var(--chip);color:var(--muted);border-radius:999px;padding:3px 8px;font-size:11px;font-weight:700}.ladder .rung.done{background:var(--brand);color:#fff}.ladder .rung.now{box-shadow:0 0 0 2px var(--brand-soft)}.ladder.big .rung{padding:6px 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