:root{--bg:#f4f6fb;--card:#fff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--primary:#1e3a8a;--primary2:#2563eb;--ok:#059669;--warn:#d97706;--bad:#dc2626;--radius:14px;--shadow:0 1px 3px rgba(17,24,39,.08),0 6px 20px rgba(17,24,39,.05)}
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",sans-serif;background:var(--bg);color:var(--text);line-height:1.55;font-size:15px;padding-bottom:calc(64px + env(safe-area-inset-bottom))}
a{color:var(--primary2);text-decoration:none}
button{font:inherit;cursor:pointer}
.topbar{position:sticky;top:0;z-index:20;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 16px;height:52px;box-shadow:0 2px 8px rgba(0,0,0,.15)}
.brand{color:#fff;font-weight:700;display:flex;align-items:center;gap:8px;font-size:15px}
.logo{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:8px;background:#fff;color:var(--primary);font-weight:800}
.topnav{display:none;gap:4px}.topnav a{color:#dbeafe;padding:6px 10px;border-radius:8px;font-size:14px}.topnav a.active{background:rgba(255,255,255,.18);color:#fff}
.bottomnav{position:fixed;left:0;right:0;bottom:0;z-index:20;display:grid;grid-template-columns:repeat(6,1fr);background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
.bottomnav a{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 2px 6px;font-size:11px;color:var(--muted)}
.bottomnav a .ic{font-size:18px;line-height:1}.bottomnav a.active{color:var(--primary2);font-weight:700}
@media(min-width:900px){.topnav{display:flex}.bottomnav{display:none}body{padding-bottom:40px}}
.view{max-width:980px;margin:0 auto;padding:16px}
h1{font-size:22px;margin:4px 0 14px}h2{font-size:17px;margin:20px 0 10px}h3{font-size:15px;margin:14px 0 8px}
.muted{color:var(--muted);font-size:13px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:14px}
.grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.grid2{display:grid;gap:12px;grid-template-columns:1fr 1fr}@media(max-width:640px){.grid2{grid-template-columns:1fr}}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.btn{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:10px;padding:9px 14px;font-weight:600;font-size:14px;transition:.15s}
.btn:hover{border-color:#c7d2fe;background:#f8faff}.btn:disabled{opacity:.5;cursor:default}
.btn.primary{background:var(--primary2);border-color:var(--primary2);color:#fff}.btn.primary:hover{background:#1d4ed8}
.btn.ok{background:var(--ok);border-color:var(--ok);color:#fff}.btn.warn{background:var(--warn);border-color:var(--warn);color:#fff}.btn.bad{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.sm{padding:5px 10px;font-size:13px;border-radius:8px}.btn.block{width:100%}
.chip{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600;background:#eef2ff;color:#3730a3}
.chip.on{background:var(--primary2);color:#fff}.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip.subj{color:#fff}
.dday{font-size:40px;font-weight:800;letter-spacing:-1px;line-height:1}.dday small{font-size:14px;font-weight:600;color:var(--muted)}
.stat{display:flex;flex-direction:column;gap:2px}.stat b{font-size:24px}
.bar{height:8px;background:#e5e7eb;border-radius:999px;overflow:hidden}.bar i{display:block;height:100%;background:var(--primary2);border-radius:999px;transition:width .3s}
table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-weight:600;font-size:13px}
input[type=text],input[type=number],input[type=date],select,textarea{font:inherit;border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;color:var(--text);width:100%}
textarea{min-height:220px;resize:vertical;line-height:1.6}
label.f{display:block;font-size:13px;color:var(--muted);margin:8px 0 4px}
.check{display:flex;gap:8px;align-items:flex-start;padding:6px 0;border-bottom:1px dashed var(--line)}.check input{margin-top:4px}.check.done span{color:var(--muted);text-decoration:line-through}
.flash{min-height:260px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:24px;cursor:pointer;background:linear-gradient(180deg,#fff,#f8faff)}
.flash .q{font-size:18px;font-weight:700;line-height:1.5;width:100%;overflow-wrap:anywhere}.flash .a{font-size:15px;line-height:1.7;text-align:left;white-space:pre-wrap;width:100%;overflow-wrap:anywhere}
.flash .tag{margin-bottom:12px}
.grade{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.opt{display:block;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 12px;margin:6px 0;font-size:14px}
.opt.sel{border-color:var(--primary2);background:#eff6ff}.opt.right{border-color:var(--ok);background:#ecfdf5}.opt.wrong{border-color:var(--bad);background:#fef2f2}
.exp{background:#f9fafb;border-left:3px solid var(--primary2);padding:8px 12px;border-radius:6px;font-size:14px;margin-top:8px}
.kw{display:inline-block;padding:2px 8px;border-radius:6px;font-size:13px;margin:2px}.kw.hit{background:#d1fae5;color:#065f46}.kw.miss{background:#fee2e2;color:#991b1b}
.timer{font-variant-numeric:tabular-nums;font-size:28px;font-weight:800}
.timer.low{color:var(--bad)}
.steps li{margin:4px 0}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%);background:#111827;color:#fff;padding:10px 16px;border-radius:10px;font-size:14px;z-index:50;box-shadow:var(--shadow)}
.big{font-size:20px;font-weight:800}
.pill{display:inline-block;min-width:26px;text-align:center;padding:2px 8px;border-radius:8px;background:#f3f4f6;font-weight:700;font-size:13px}
.ok-text{color:var(--ok)}.bad-text{color:var(--bad)}
.hr{height:1px;background:var(--line);margin:12px 0}
ul.tight{margin:6px 0;padding-left:18px}ul.tight li{margin:3px 0}
.src{font-size:12px;color:var(--muted);margin-top:8px}
.week{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:8px 0}.week.cur{border-color:var(--primary2);box-shadow:0 0 0 2px #dbeafe}
.week h4{margin:0 0 4px;font-size:14px}
.boxes{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;text-align:center;font-size:12px}.boxes div{background:#f3f4f6;border-radius:8px;padding:6px 2px}.boxes b{display:block;font-size:16px}