/* ---------------------------
   0) 기본 설정 & 컬러 토큰
--------------------------- */
:root{
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --primary: #0b57d0;
  --primary-weak: #e8f0fe;
  --border: #e5e7eb;
  --code-bg: #f5f7fa;
  --blockquote-bg: #fafafa;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.06);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg: #0b0c0f;
    --fg: #e6e6e6;
    --muted: #a6a6a6;
    --primary: #7aa2ff;
    --primary-weak: #122043;
    --border: #2a2d34;
    --code-bg: #12151b;
    --blockquote-bg: #121319;
    --shadow: 0 1px 2px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.4);
  }
}

/* ---------------------------
   1) 타이포 & 레이아웃
--------------------------- */
html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }
html, body { height: 100%; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Apple SD Gothic Neo", "맑은 고딕", "Malgun Gothic", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

header, main, footer{
  width: min(100%, 960px);
  margin-inline: auto;
  padding-inline: 20px;
}
header { padding-top: 28px; padding-bottom: 8px; }
main   { padding-block: 20px 48px; }
footer { padding-block: 24px 40px; color: var(--muted); border-top: 1px solid var(--border); }

/* 제목 계층 */
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .6em; }
h1{ font-size: clamp(28px, 4vw, 36px); letter-spacing: -0.01em; }
h2{ font-size: clamp(22px, 3vw, 28px); margin-top: 1.8em; border-bottom: 1px solid var(--border); padding-bottom: .35em; }
h3{ font-size: clamp(18px, 2.2vw, 22px); margin-top: 1.4em; }
h4{ font-size: 16px; text-transform: none; color: var(--muted); }

p{ margin: 0 0 1em; }

/* 링크 */
a{ color: var(--primary); text-decoration: none; }
a:hover, a:focus{ text-decoration: underline; text-underline-offset: 2px; }
a[target="_blank"]::after{
  content: " ↗";
  font-size: .9em;
  color: var(--muted);
}

/* 목록 */
ul{ padding-left: 1.2em; margin: .6em 0 1em; }
li{ margin: .25em 0; }
li > ul{ margin-top: .25em; }

/* 코드/IRI */
code, kbd{
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Cascadia Mono", "D2Coding", monospace;
  font-size: .95em;
  background: var(--code-bg);
  padding: .15em .35em;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* 인용문 */
blockquote{
  margin: 1em 0;
  padding: 12px 16px;
  background: var(--blockquote-bg);
  border-left: 4px solid var(--primary);
  border-radius: 6px;
}
blockquote p{ margin: .4em 0; }
cite{ font-style: normal; color: var(--muted); }

/* 표 */
table{
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: .8em 0 1.4em;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
caption{
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-weight: 600;
}
thead th{
  background: var(--primary-weak);
  text-align: left;
}
th, td{
  padding: 12px 14px;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
tbody tr:last-child th,
tbody tr:last-child td{ border-bottom: none; }
th[scope="row"]{ white-space: nowrap; }
tbody tr:hover td, tbody tr:hover th[scope="row"]{
  background: color-mix(in oklab, var(--primary-weak) 40%, transparent);
}

/* 이미지 */
figure{ margin: 1.2em 0; }
img{ max-width: 100%; height: auto; border-radius: 10px; box-shadow: var(--shadow); }
figcaption{ color: var(--muted); font-size: .95em; margin-top: .4em; }

/* 구획 간격 */
section + section{ margin-top: 1.6em; }
article + article{ margin-top: 1.2em; }

/* 포커스 */
:focus-visible{
  outline: 3px solid color-mix(in oklab, var(--primary) 60%, white);
  outline-offset: 2px;
  border-radius: 6px;
}

/* 인쇄 */
@media print{
  header, footer{ box-shadow: none; border: 0; }
  a[target="_blank"]::after{ content: " (" attr(href) ")"; }
}