:root{--ink:#1d2433;--sub:#5b6476;--line:#e3e6ec;--bg:#f6f4ef;--card:#fff;--navy:#1f3a5f;--teal:#2f7d74;--red:#b3261e;--green:#2e7d32;--gold:#9a7b2f;--soft:#eef2f7}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:'Noto Sans KR',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
a{color:var(--navy)}
.top{position:sticky;top:0;z-index:10;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:900;font-size:18px}
.seal{display:inline-grid;place-items:center;width:34px;height:34px;border:2px solid #fff;border-radius:6px;font-family:'Noto Serif KR',serif;font-size:18px}
.top nav{display:flex;gap:4px;flex-wrap:wrap}
.top nav a{color:#dfe7f2;text-decoration:none;padding:6px 10px;border-radius:6px;font-weight:500;font-size:15px}
.top nav a.on,.top nav a:hover{background:rgba(255,255,255,.14);color:#fff}
main{max-width:980px;margin:0 auto;padding:24px 16px 48px}
.foot{max-width:980px;margin:0 auto;padding:16px;color:var(--sub);font-size:13px;border-top:1px solid var(--line)}
h1{font-family:'Noto Serif KR',serif;font-size:28px;margin:4px 0 12px}
h2{font-size:20px;margin:28px 0 10px}
h3{font-size:17px;margin:18px 0 6px;color:var(--navy)}
.lead{color:var(--sub);margin-top:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin:12px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.tile{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:inherit;transition:.15s}
.tile:hover{border-color:var(--navy);transform:translateY(-1px)}
.tile b{display:block;font-size:17px;margin-bottom:4px}
.tile span{color:var(--sub);font-size:14px}
.hero{background:linear-gradient(135deg,#1f3a5f,#2f5a7d);color:#fff;border-radius:14px;padding:22px;margin-bottom:8px}
.hero h1{color:#fff;margin:0 0 6px}
.hero p{margin:4px 0;color:#dbe6f3}
.dday{display:inline-block;background:#fff;color:var(--navy);font-weight:900;border-radius:999px;padding:3px 12px;margin-top:6px}
.btn{display:inline-block;border:1px solid var(--navy);background:var(--navy);color:#fff;border-radius:8px;padding:9px 16px;font-size:15px;font-weight:700;cursor:pointer;text-decoration:none;font-family:inherit}
.btn.ghost{background:#fff;color:var(--navy)}
.btn.small{padding:5px 10px;font-size:13px}
.btn:disabled{opacity:.45;cursor:default}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.pill{display:inline-block;font-size:12px;padding:2px 8px;border-radius:999px;background:var(--soft);color:var(--navy);font-weight:700}
.era-an{background:#e8f1ec;color:#2b6b45}.era-go{background:#e9eef8;color:#2a4f8f}.era-jo{background:#f3ece2;color:#7a5523}.era-gd{background:#f6e9ec;color:#8a2f45}.era-il{background:#eceaf4;color:#4c3f86}.era-hd{background:#e6f3f3;color:#1d6a6a}
.notes ul{margin:4px 0 8px;padding-left:20px}
.notes li{margin:3px 0}
.q{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin:12px 0}
.q .meta{display:flex;gap:6px;align-items:center;margin-bottom:8px;color:var(--sub);font-size:13px}
.q .src{background:#fbfaf6;border:1px solid #e6e1d4;border-left:4px solid var(--gold);padding:12px 14px;border-radius:6px;white-space:pre-line;margin:8px 0 10px}
.q .stem{font-weight:700;margin:6px 0 10px}
.choices{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.choices button{width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:inherit;cursor:pointer;display:flex;gap:10px;align-items:flex-start}
.choices button:hover{border-color:var(--navy)}
.choices button:disabled{color:inherit;cursor:default}
.choices button .n{font-weight:700;color:var(--navy);min-width:20px}
.choices button.sel{border-color:var(--navy);background:var(--soft)}
.choices button.right{border-color:var(--green);background:#e9f5ea}
.choices button.wrong{border-color:var(--red);background:#fbeaea}
.exp{margin-top:12px;padding:12px 14px;border-radius:8px;background:#f4f7fb;border:1px solid #dfe6f0}
.exp.ok{border-color:#bfe0c2;background:#eef8ef}.exp.no{border-color:#efc3c0;background:#fdf1f0}
.exp b{display:block;margin-bottom:4px}
.bar{height:10px;background:#e7e9ee;border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--teal)}
.bar.low i{background:var(--red)}
.stat{display:grid;grid-template-columns:120px 1fr 70px;gap:10px;align-items:center;margin:6px 0;font-size:14px}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{border-bottom:1px solid var(--line);padding:8px;text-align:left}
.examwrap{display:grid;grid-template-columns:1fr 210px;gap:16px;align-items:start}
.sheet{position:sticky;top:70px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px}
.timer{font-size:26px;font-weight:900;font-variant-numeric:tabular-nums;color:var(--navy);text-align:center}
.timer.warn{color:var(--red)}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;margin:10px 0}
.cells a{display:block;text-align:center;font-size:12px;padding:4px 0;border:1px solid var(--line);border-radius:4px;text-decoration:none;color:var(--sub)}
.cells a.done{background:var(--navy);color:#fff;border-color:var(--navy)}
.cells a.cur{outline:2px solid var(--teal)}
.score{font-size:44px;font-weight:900;font-family:'Noto Serif KR',serif;color:var(--navy)}
.grade{font-size:20px;font-weight:900}
.tlist{list-style:none;padding:0;margin:0;border-left:3px solid var(--line)}
.tlist li{position:relative;padding:6px 0 6px 18px}
.tlist li::before{content:'';position:absolute;left:-7px;top:13px;width:11px;height:11px;border-radius:50%;background:var(--navy)}
.tlist .yr{font-weight:900;color:var(--navy);margin-right:8px;font-variant-numeric:tabular-nums}
.order{display:grid;gap:8px}
.order button{text-align:left;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px;font:inherit;cursor:pointer;display:flex;gap:10px;align-items:center}
.order button .k{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;border:1px solid var(--line);font-weight:900;color:var(--sub)}
.order button.picked .k{background:var(--navy);color:#fff;border-color:var(--navy)}
.order button.right{border-color:var(--green);background:#eef8ef}.order button.wrong{border-color:var(--red);background:#fdf1f0}
.order button .yy{margin-left:auto;font-weight:700;color:var(--sub)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0 14px}
.tabs a{padding:6px 12px;border-radius:999px;border:1px solid var(--line);text-decoration:none;color:var(--sub);background:#fff;font-size:14px}
.tabs a.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.modal{position:fixed;inset:0;background:rgba(20,28,40,.45);display:grid;place-items:center;z-index:50}
.modal[hidden]{display:none}
.modal .box{background:#fff;border-radius:12px;padding:20px;max-width:420px;width:calc(100% - 32px)}
.muted{color:var(--sub);font-size:14px}
input,select{font:inherit;padding:7px 9px;border:1px solid var(--line);border-radius:6px}
.loading{color:var(--sub)}
.only-m{display:none}
@media (max-width:760px){
  .examwrap{grid-template-columns:1fr}
  .sheet{position:static;order:-1}
  .cells{grid-template-columns:repeat(10,1fr);display:none}.cells.open{display:grid}.only-m{display:block}
  .sheet{display:grid;grid-template-columns:1fr 1fr;gap:6px;align-items:center}.sheet .timer{font-size:22px}.sheet .cells,.sheet #submit,.sheet #pause,.sheet #cellsT{grid-column:1/-1}
  .top{padding:8px 12px}.top nav a{padding:5px 7px;font-size:14px}
  h1{font-size:23px}.stat{grid-template-columns:90px 1fr 56px}
}