/* devjar lab · TOPIK I guides — same tokens as the practice test page (../index.html) */
:root{
 --bg:#f4f5fb;--surface:#fff;--surface2:#f7f8fd;--ink:#141a2e;--muted:#5b6478;--faint:#8b93a7;--line:#e3e6f0;
 --brand:#4f46e5;--brand2:#7c3aed;--soft:#eef0ff;--soft-line:#c9cdfb;
 --ok:#15803d;--ok-soft:#e7f6ec;--bad:#c2410c;--bad-soft:#fdeee6;--gold:#f59e0b;
 --lv0:#d9dce8;--lv1:#a5b4fc;
 --shadow:0 1px 2px rgba(20,26,46,.05),0 8px 24px -8px rgba(20,26,46,.12);
 --shadow-lg:0 2px 4px rgba(20,26,46,.04),0 24px 48px -16px rgba(40,36,120,.28);
 --r:18px;--ease:cubic-bezier(.2,.8,.2,1);
}
@media (prefers-color-scheme:dark){:root{
 --bg:#0b0f1a;--surface:#131a2b;--surface2:#0f1524;--ink:#e9ecf6;--muted:#a3abc0;--faint:#7c859c;--line:#232c42;
 --brand:#8183f8;--brand2:#a78bfa;--soft:#1d2142;--soft-line:#3b3f86;
 --ok:#4ade80;--ok-soft:#10291b;--bad:#fb923c;--bad-soft:#2d1a10;
 --lv0:#2a3248;--lv1:#4b4fa8;
 --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px -8px rgba(0,0,0,.5);
 --shadow-lg:0 24px 48px -16px rgba(0,0,0,.6);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Noto Sans KR",system-ui,-apple-system,"Segoe UI",Roboto,"Apple SD Gothic Neo",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;overflow-x:hidden}
a{color:var(--brand)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.ko{word-break:keep-all;overflow-wrap:anywhere}

/* header (same as test page) */
.top{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:12px;height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;min-width:0}
.logo{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;font-weight:900;font-size:18px;box-shadow:0 4px 12px -4px rgba(79,70,229,.6);flex:none}
.bname{font-weight:900;font-size:1.08rem;letter-spacing:-.01em;line-height:1.1}
.bname small{display:block;font-weight:500;font-size:.72rem;color:var(--muted);letter-spacing:0}
.top .sp{flex:1}
.btag{font-size:.8rem;font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:3px 10px;white-space:nowrap}
.toplink{display:inline-flex;align-items:center;min-height:40px;padding:6px 14px;border-radius:12px;font-size:.88rem;font-weight:700;text-decoration:none;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));white-space:nowrap}
@media (prefers-color-scheme:dark){.toplink{background:linear-gradient(135deg,#5b52f0,#7c3aed)}}

/* hero band */
.hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(1000px 420px at 85% -10%,#8b5cf6 0%,transparent 60%),radial-gradient(800px 420px at -10% 110%,#2563eb 0%,transparent 55%),linear-gradient(135deg,#3730a3,#4f46e5 45%,#6d28d9);padding:40px 0 96px}
@media (prefers-color-scheme:dark){.hero{background:radial-gradient(1000px 420px at 85% -10%,#5b21b6 0%,transparent 60%),radial-gradient(800px 420px at -10% 110%,#1e3a8a 0%,transparent 55%),linear-gradient(135deg,#1e1b4b,#312e81 50%,#3b0764)}}
.hero .inner{max-width:800px}
.crumbs{font-size:.82rem;opacity:.85;margin:0 0 14px}
.crumbs a{color:#fff}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:6px 12px;border-radius:99px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22)}
.hero h1{font-size:clamp(1.8rem,4vw,2.7rem);line-height:1.12;letter-spacing:-.025em;font-weight:900;margin:16px 0 12px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,#fde68a,#fbcfe8 60%,#c7d2fe);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:1.05rem;opacity:.92;margin:0;max-width:680px}
.meta{font-size:.82rem;opacity:.8;margin-top:14px}

/* article */
.article{max-width:800px;margin:-64px auto 0;padding:0 20px;position:relative}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:26px;margin-bottom:20px}
.card.lift{box-shadow:var(--shadow-lg)}
.card h2{font-size:1.3rem;font-weight:800;letter-spacing:-.01em;line-height:1.3;margin:0 0 10px}
.card h3{font-size:1.05rem;font-weight:800;margin:20px 0 6px}
.card p{margin:0 0 12px}
.card p:last-child{margin-bottom:0}
.card ul,.card ol{margin:0 0 12px;padding-left:22px}
.card li{margin:4px 0}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.tldr{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:6px 0 4px}
.tldr div{background:var(--surface2);border:1px solid var(--line);border-radius:14px;padding:14px}
.tldr b{display:block;font-size:1.5rem;font-weight:900;line-height:1.1;background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.tldr span{font-size:.84rem;color:var(--muted);line-height:1.35;display:block;margin-top:4px}

/* tables */
.tbl{width:100%;border-collapse:separate;border-spacing:0;font-size:.95rem;margin:4px 0 12px;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.tbl th,.tbl td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--surface2);font-size:.8rem;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);font-weight:700}
.tbl tr:last-child td{border-bottom:0}
.tbl td.num{font-variant-numeric:tabular-nums;font-weight:700;white-space:nowrap}

/* score band graphic */
.band{margin:14px 0 6px}
.band .bar{display:flex;height:54px;border-radius:14px;overflow:hidden;box-shadow:inset 0 0 0 1px var(--line)}
.band .seg{display:flex;flex-direction:column;justify-content:center;padding:0 12px;min-width:0;font-weight:800;font-size:.92rem;line-height:1.15}
.band .seg small{font-weight:600;font-size:.74rem;opacity:.85}
.band .s0{flex:80;background:var(--lv0);color:var(--muted)}
.band .s1{flex:60;background:var(--lv1);color:#1e1b4b}
.band .s2{flex:61;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff}
@media (prefers-color-scheme:dark){.band .s1{color:#eef0ff}}
.band .ticks{position:relative;height:22px;font-size:.78rem;color:var(--faint);font-variant-numeric:tabular-nums;font-weight:700}
.band .ticks span{position:absolute;top:4px;transform:translateX(-50%)}
.band .ticks span:first-child{transform:none}
.band .ticks span:last-child{transform:translateX(-100%)}

/* stacked example bars */
.ex{display:grid;gap:12px;margin:10px 0 4px}
.exrow{display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center}
.exrow .lab{font-size:.88rem;font-weight:700}
.exrow .res{font-size:.84rem;font-weight:800;padding:3px 10px;border-radius:99px;white-space:nowrap}
.res.l0{background:var(--lv0);color:var(--muted)}.res.l1{background:var(--soft);color:var(--brand)}.res.l2{background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff}
.exrow .track{grid-column:1/-1;position:relative;display:flex;height:16px;border-radius:99px;background:var(--surface2);box-shadow:inset 0 0 0 1px var(--line);overflow:hidden}
.track .li{background:#38bdf8}.track .rd{background:#8b5cf6}
.track .cut{position:absolute;top:-2px;bottom:-2px;width:2px;background:var(--ink);opacity:.35}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.8rem;color:var(--muted);margin-top:6px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px}

/* question example */
.qex{border:1px solid var(--line);border-radius:16px;background:var(--surface2);padding:18px;margin:12px 0}
.qex .tag{display:inline-block;font-size:.76rem;font-weight:700;padding:3px 10px;border-radius:99px;background:var(--soft);color:var(--brand);margin-bottom:10px}
.qex .ins{font-size:.9rem;color:var(--muted);margin:0 0 8px}
.qex .pass{white-space:pre-line;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-weight:500;margin:0 0 10px;line-height:1.75}
.qex ol{list-style:none;padding:0;margin:0 0 10px;display:grid;gap:6px}
.qex li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:9px 12px;margin:0}
.qex details{border-top:1px dashed var(--line);padding-top:10px}
.qex summary{cursor:pointer;font-weight:700;color:var(--brand);min-height:44px;display:flex;align-items:center;list-style:none}
.qex summary::-webkit-details-marker{display:none}
.qex summary::before{content:"+";display:inline-grid;place-items:center;width:22px;height:22px;border-radius:7px;background:var(--soft);margin-right:8px;font-weight:900}
.qex details[open] summary::before{content:"−"}
.qex .ans{background:var(--ok-soft);color:var(--ink);border-radius:12px;padding:10px 12px;font-size:.93rem}
.qex .ans b{color:var(--ok)}

/* screenshot */
.shot{margin:12px 0 4px;border-radius:16px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.cap{font-size:.82rem;color:var(--faint);margin-top:8px}

/* CTA */
.cta{background:radial-gradient(600px 240px at 90% -20%,#8b5cf6 0%,transparent 60%),linear-gradient(135deg,#3730a3,#4f46e5 50%,#6d28d9);color:#fff;border:0}
@media (prefers-color-scheme:dark){.cta{background:radial-gradient(600px 240px at 90% -20%,#5b21b6 0%,transparent 60%),linear-gradient(135deg,#1e1b4b,#312e81 50%,#3b0764)}}
.cta h2{color:#fff}
.cta p{opacity:.92}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:56px;padding:14px 22px;border-radius:16px;font-weight:800;font-size:1.04rem;text-decoration:none;background:#fff;color:#3730a3;box-shadow:0 10px 24px -10px rgba(0,0,0,.45);transition:transform .12s var(--ease)}
.btn:active{transform:scale(.97)}
.btn .arr{transition:transform .2s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}
.cta .fine{font-size:.82rem;opacity:.8;margin-top:12px}

.related{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.related a{display:block;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:14px;padding:14px;background:var(--surface2);min-height:44px}
.related a b{display:block;color:var(--brand)}
.related a span{font-size:.86rem;color:var(--muted)}

footer{border-top:1px solid var(--line);margin-top:40px}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:20px;padding-bottom:40px;font-size:.82rem;color:var(--muted)}
footer p{margin:0}

@media (max-width:640px){
 .top .btag{display:none}
 .hero{padding:28px 0 84px}
 .card{padding:20px}
 .tldr{grid-template-columns:1fr}
 .tldr div{display:flex;align-items:baseline;gap:10px}
 .tldr span{margin-top:0}
 .related{grid-template-columns:1fr}
 .band .seg{padding:0 8px;font-size:.82rem}
 .band .seg small{font-size:.68rem}
 .btn{width:100%}
 .tbl{font-size:.88rem}
 .tbl th,.tbl td{padding:9px 9px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}