:root{--bg:#f5f6f8;--surface:#fff;--text:#1b2130;--muted:#5a6376;--line:#dce0e7;--primary:#2456d6;--primary-weak:#e7eefc;--on-primary:#fff;--ok:#1d7f47;--ok-weak:#e2f4e9;--bad:#c2362b;--bad-weak:#fbe7e5;--warn:#9a5b00;--warn-weak:#fff1d6;--radius:14px;font-size:18px}html[data-font=lg]{font-size:20px}html[data-font=xl]{font-size:23px}@media (prefers-color-scheme:dark){:root{--bg:#12151b;--surface:#1b2029;--text:#e9ecf2;--muted:#a4acbb;--line:#2e3542;--primary:#7aa2ff;--primary-weak:#1e2a45;--on-primary:#0d1220;--ok:#5ccc8a;--ok-weak:#15301f;--bad:#ff8278;--bad-weak:#3a1c1a;--warn:#ffbd5a;--warn-weak:#35290f}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);word-break:keep-all;-webkit-text-size-adjust:100%;margin:0;font-family:Pretendard,Apple SD Gothic Neo,Malgun Gothic,system-ui,sans-serif;line-height:1.6}h1{margin:8px 0 16px;font-size:1.5rem}h2{margin:24px 0 12px;font-size:1.15rem}a{color:var(--primary)}.muted{color:var(--muted)}.small{font-size:.85rem}.error{color:var(--bad);font-weight:600}.center{place-items:center;min-height:40vh;display:grid}.row{align-items:center;gap:8px;display:flex}.between{justify-content:space-between}.gap{gap:12px}.stack{gap:10px;display:grid}.app{min-height:100vh}main{max-width:760px;padding:16px 16px calc(96px + env(safe-area-inset-bottom));margin:0 auto}.sidebar{display:none}.tabbar{background:var(--surface);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);z-index:10;grid-template-columns:repeat(5,1fr);display:grid;position:fixed;bottom:0;left:0;right:0}.tab{min-height:64px;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;font-size:.8rem;font-weight:600;text-decoration:none;display:flex}.tab .ico{font-size:1.3rem;line-height:1.2}.tab.active{color:var(--primary)}@media (width>=900px){.app{grid-template-columns:220px 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var(--line);background:var(--surface);min-height:52px;color:var(--text);font:inherit;cursor:pointer;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:0 20px;font-weight:700;text-decoration:none;display:inline-flex}.btn.primary{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}.btn.block{width:100%}.btn.small{min-height:44px;padding:0 14px;font-size:.9rem}.btn:disabled{opacity:.45;cursor:default}.chips{flex-wrap:wrap;gap:8px;margin-bottom:8px;display:flex}.chip{border:2px solid var(--line);background:var(--surface);min-height:48px;color:var(--text);font:inherit;cursor:pointer;border-radius:999px;padding:0 16px;font-weight:600}.chip.on{border-color:var(--primary);background:var(--primary-weak);color:var(--primary)}.progress{background:var(--line);border-radius:6px;height:10px;margin-top:8px;overflow:hidden}.progress>span{background:var(--primary);height:100%;display:block}.progress>span.st-weak{background:var(--bad)}.progress>span.st-caution{background:var(--warn)}.progress>span.st-good{background:var(--ok)}.badge{white-space:nowrap;border-radius:999px;padding:2px 10px;font-size:.8rem;font-weight:700;display:inline-block}.badge.weak{background:var(--bad-weak);color:var(--bad)}.badge.caution{background:var(--warn-weak);color:var(--warn)}.badge.good{background:var(--ok-weak);color:var(--ok)}.badge.insufficient{background:var(--line);color:var(--muted)}.stem p{white-space:pre-line;margin:4px 0 16px;font-size:1.05rem;font-weight:600}.choice{text-align:left;border:2px solid var(--line);background:var(--surface);width:100%;min-height:56px;color:var(--text);font:inherit;cursor:pointer;border-radius:12px;align-items:flex-start;gap:12px;margin-bottom:10px;padding:14px 16px;display:flex}.choice:disabled{cursor:default}.choice.selected{border-color:var(--primary);background:var(--primary-weak)}.choice.correct{border-color:var(--ok);background:var(--ok-weak)}.choice.wrong{border-color:var(--bad);background:var(--bad-weak)}.num{border:2px solid;border-radius:50%;flex:none;place-items:center;width:30px;height:30px;font-size:.85rem;font-weight:800;display:grid}.verdict-line{margin:8px 0;font-size:1.2rem;font-weight:800}.verdict-line.ok{color:var(--ok)}.verdict-line.bad{color:var(--bad)}.explain{background:var(--bg);white-space:pre-line;border-radius:12px;margin-top:8px;padding:14px 16px}.quiz-top{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.star{cursor:pointer;background:0 0;border:none;min-width:48px;min-height:48px;font-size:1.5rem}.hero{text-align:center}.dday{color:var(--primary);font-size:2.4rem;font-weight:900}.task{color:var(--text);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;text-decoration:none;display:block}.task strong{font-size:1.05rem;display:block}.task.hot{border:2px solid var(--primary)}.exam-bar{z-index:5;background:var(--surface);border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:8px 12px;margin:-16px -16px 16px;padding:10px 16px;display:flex;position:sticky;top:0}.timer{font-variant-numeric:tabular-nums;font-size:1.2rem;font-weight:900}.timer.urgent{color:var(--bad)}.save.error{color:var(--bad);font-weight:700}.grid-nav{grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:6px;display:grid}.cell{border:2px solid var(--line);background:var(--surface);min-height:48px;color:var(--text);font:inherit;border-radius:10px;font-weight:700}.cell.done{background:var(--primary-weak);border-color:var(--primary)}.cell.current{outline:3px solid var(--primary)}.score-grid{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.score-grid .card{text-align:center;padding:12px 8px}.score{font-size:1.5rem;font-weight:900}.score.ok{color:var(--ok)}.score.warn{color:var(--warn)}.score.bad{color:var(--bad)}.verdict{text-align:center}.verdict .big{font-size:2rem;font-weight:900}.verdict.pass .big{color:var(--ok)}.verdict.fail .big{color:var(--bad)}details.area{border-top:1px solid var(--line);padding:12px 0}details.area>summary{cursor:pointer;list-style:none}details.area>summary::-webkit-details-marker{display:none}.topics{gap:6px;margin:12px 0;padding:0;list-style:none;display:grid}.chart{width:100%;height:auto}.chart .grid{stroke:var(--line)}.chart .th{stroke:var(--ok);stroke-dasharray:4 4}.chart .line{fill:none;stroke:var(--primary);stroke-width:3px}.chart .dot.ok{fill:var(--ok)}.chart .dot.bad{fill:var(--bad)}.chart .axis{fill:var(--muted);font-size:11px}.chart .val{fill:var(--text);font-size:12px;font-weight:700}.note h1{font-size:1.35rem}.note h2{font-size:1.15rem}.note h3{font-size:1.05rem}.note table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}.note th,.note td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:8px}.note strong{color:var(--primary)}.login{max-width:420px;margin:0 auto;padding:48px 16px}.login h1{text-align:center;font-size:1.6rem}label{gap:6px;margin-bottom:14px;font-weight:700;display:grid}input,select{font:inherit;border:2px solid var(--line);background:var(--surface);min-height:52px;color:var(--text);border-radius:12px;padding:0 14px}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid var(--primary);outline-offset:2px}table.admin{border-collapse:collapse;width:100%}table.admin td,table.admin th{border-bottom:1px solid var(--line);text-align:left;padding:8px}