/* ===================================================================
   TopEduPrep SAT Journal — Design System
   Concept: "채점 원장(grading ledger)" — a Korean teacher's graded
   answer sheet. Ruled paper, navy ink, a red 정답(correct) stamp as
   the signature mark, gold foil for premium/curriculum accents.
=================================================================== */

:root{
  --paper:      #F6F1E3;
  --paper-2:    #EFE8D6;
  --ink:        #1D2A44;
  --ink-soft:   #3C4A66;
  --stamp:      #A61C2E;
  --stamp-dark: #7E1522;
  --gold:       #B8923F;
  --sage:       #4C6B52;
  --line:       #D9CFB4;
  --white:      #FFFDF8;
  --shadow:     0 6px 24px rgba(29,42,68,0.10);
  --radius:     14px;
  --maxw:       1120px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Pretendard", "Noto Sans KR", -apple-system, sans-serif;
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:"Noto Serif KR", serif;
  color:var(--ink);
  line-height:1.35;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(1.9rem,4vw,2.9rem);}
h2{font-size:clamp(1.35rem,2.6vw,1.9rem); margin-top:2.4em;}
h3{font-size:1.2rem; margin-top:1.6em;}
p{margin:0 0 1.1em;}
a{color:var(--stamp); text-decoration:none;}
a:hover{text-decoration:underline;}
ul,ol{padding-left:1.3em;}
li{margin-bottom:.5em;}
.mono{font-family:"IBM Plex Mono", monospace;}

/* ---------- ruled-paper texture on body sections ---------- */
.ruled{
  background-image:repeating-linear-gradient(
    to bottom, transparent, transparent 41px, var(--line) 42px);
}

/* ---------- layout shells ---------- */
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 24px;}
.narrow{max-width:760px; margin:0 auto; padding:0 24px;}

/* ---------- header / nav ---------- */
header.site{
  background:var(--ink);
  color:var(--paper);
  position:sticky; top:0; z-index:50;
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
.nav-row{
  display:flex; align-items:center; justify-content:space-between;
  max-width:var(--maxw); margin:0 auto; padding:14px 24px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family:"Noto Serif KR", serif; font-weight:700; font-size:1.15rem;
  color:var(--paper);
}
.brand .stamp-mark{width:34px; height:34px; flex:none;}
.brand small{display:block; font-family:"Pretendard",sans-serif; font-weight:400; font-size:.68rem; color:var(--gold); letter-spacing:.04em;}
nav.menu{display:flex; gap:2px; flex-wrap:wrap;}
nav.menu a{
  color:var(--paper); font-size:.86rem; padding:8px 11px; border-radius:8px;
  opacity:.86; white-space:nowrap;
}
nav.menu a:hover, nav.menu a.active{background:rgba(255,255,255,.1); opacity:1; text-decoration:none;}
#navToggle{display:none;}
.burger{display:none; background:none; border:0; color:var(--paper); font-size:1.4rem; cursor:pointer;}

@media (max-width:920px){
  nav.menu{
    display:none; width:100%; flex-direction:column; gap:0;
    background:var(--ink); padding:6px 0 14px;
  }
  #navToggle:checked ~ nav.menu{display:flex;}
  nav.menu a{padding:11px 6px; border-top:1px solid rgba(255,255,255,.08);}
  .burger{display:block;}
}

/* ---------- hero ---------- */
.hero{
  background:linear-gradient(180deg, var(--paper-2), var(--paper));
  border-bottom:1px solid var(--line);
  padding:56px 0 44px;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:"IBM Plex Mono", monospace; font-size:.76rem; letter-spacing:.08em;
  color:var(--stamp); text-transform:uppercase; margin-bottom:14px;
}
.eyebrow::before{content:"§"; color:var(--gold);}
.hero p.lede{font-size:1.15rem; color:var(--ink-soft); max-width:640px;}
.hero .meta-row{display:flex; gap:18px; flex-wrap:wrap; margin-top:18px; font-size:.85rem; color:var(--ink-soft); font-family:"IBM Plex Mono",monospace;}

/* ---------- stamp badge (signature element) ---------- */
.stamp-badge{
  display:inline-flex; flex-direction:column; align-items:center; justify-content:center;
  width:88px; height:88px; border-radius:50%;
  border:3px solid var(--stamp); color:var(--stamp);
  transform:rotate(-9deg); font-family:"Noto Serif KR",serif; font-weight:700;
  text-align:center; line-height:1.15; padding:6px; flex:none;
  background:rgba(166,28,46,0.04);
}
.stamp-badge span{display:block; font-size:.62rem; font-family:"IBM Plex Mono",monospace; font-weight:400; letter-spacing:.05em;}

/* ---------- cards ---------- */
.grid{display:grid; gap:20px;}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-2{grid-template-columns:repeat(2,1fr);}
@media (max-width:800px){.grid.cols-3,.grid.cols-2{grid-template-columns:1fr;}}

.card{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow);
}
.card h3{margin-top:0;}
.card .tag{
  display:inline-block; font-family:"IBM Plex Mono",monospace; font-size:.7rem;
  color:var(--sage); border:1px solid var(--sage); border-radius:20px; padding:2px 10px; margin-bottom:10px;
}

.article-card{display:block; background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow); transition:transform .15s ease;}
.article-card:hover{transform:translateY(-3px); text-decoration:none;}
.article-card .kw{font-family:"IBM Plex Mono",monospace; font-size:.72rem; color:var(--stamp); letter-spacing:.03em;}
.article-card h3{color:var(--ink); margin:.3em 0 .4em;}
.article-card p{color:var(--ink-soft); font-size:.92rem; margin-bottom:0;}

/* ---------- note / tip box ---------- */
.note{
  position:relative; background:var(--white); border:1px solid var(--line);
  border-left:5px solid var(--gold); border-radius:0 var(--radius) var(--radius) 0;
  padding:18px 20px; margin:1.6em 0;
}
.note strong{color:var(--stamp-dark);}

/* ---------- divider ---------- */
.divider{border:0; border-top:1px dashed var(--line); margin:2.6em 0;}

/* ---------- table ---------- */
table.exam{width:100%; border-collapse:collapse; margin:1.4em 0; font-size:.94rem;}
table.exam th, table.exam td{border:1px solid var(--line); padding:10px 12px; text-align:left;}
table.exam th{background:var(--paper-2); font-family:"Noto Serif KR",serif;}
table.exam td.mono{font-family:"IBM Plex Mono",monospace;}

/* ---------- CTA block ---------- */
.cta{
  background:var(--ink); color:var(--paper); border-radius:var(--radius);
  padding:32px; margin:2.8em 0; display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap;
}
.cta h3{color:var(--paper); margin:0 0 6px;}
.cta p{color:#C9D0DE; margin:0;}
.btn{
  display:inline-block; background:var(--stamp); color:#fff; padding:12px 22px;
  border-radius:9px; font-weight:600; white-space:nowrap;
}
.btn:hover{background:var(--stamp-dark); text-decoration:none;}
.btn.ghost{background:transparent; border:1px solid var(--paper); color:var(--paper);}

/* ---------- footer ---------- */
footer.site{background:var(--ink); color:#C9D0DE; margin-top:70px; padding:50px 0 24px; font-size:.9rem;}
footer.site h4{color:var(--paper); font-family:"Noto Serif KR",serif; font-size:1rem; margin-bottom:10px;}
footer.site a{color:#C9D0DE;}
footer.site a:hover{color:#fff;}
.f-grid{display:grid; grid-template-columns:1.3fr 1fr 1fr 1fr; gap:28px;}
@media (max-width:800px){.f-grid{grid-template-columns:1fr 1fr;}}
.f-bottom{border-top:1px solid rgba(255,255,255,.12); margin-top:36px; padding-top:18px; font-size:.78rem; color:#8D96A8; display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;}
.branch{margin-bottom:6px;}
.branch b{color:var(--paper);}

/* ---------- breadcrumb ---------- */
.crumb{font-size:.8rem; color:var(--ink-soft); font-family:"IBM Plex Mono",monospace; margin:16px 0 0;}
.crumb a{color:var(--ink-soft);}

/* utility */
.mt0{margin-top:0;}
.center{text-align:center;}
.small{font-size:.85rem; color:var(--ink-soft);}