:root {
  --bg: #faf9f7;
  --panel: #ffffff;
  --soft: #f1efeb;
  --text: #1f1e1c;
  --muted: #6f6b64;
  --line: #e2dfd9;
  --accent: #c96442;
  --accent-text: #ffffff;
  --openai: #10a37f;
  --anthropic: #c96442;
  --xai: #555555;
  --google: #4285f4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #262624;
    --panel: #30302e;
    --soft: #1f1e1d;
    --text: #ecebe8;
    --muted: #a19e97;
    --line: #3d3d3a;
    --accent: #d97757;
    --xai: #bbbbbb;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.75 "Pretendard", "Malgun Gothic", system-ui, sans-serif; }
a { color: var(--accent); }
img { max-width: 100%; }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }

/* 상단 / 하단 */
.site-head { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.site-head .wrap { display: flex; align-items: center; gap: 16px; height: 58px; }
.logo { font-weight: 800; font-size: 18px; color: var(--text); text-decoration: none; white-space: nowrap; }
.logo span { color: var(--accent); }
.nav { display: flex; gap: 16px; flex: 1; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav a:hover, .nav a[aria-current] { color: var(--text); }
.btn { display: inline-block; background: var(--accent); color: var(--accent-text); text-decoration: none; font-weight: 700; padding: 9px 18px; border-radius: 10px; white-space: nowrap; }
.btn.ghost { background: none; color: var(--text); border: 1px solid var(--line); }
.site-head .btn { padding: 6px 14px; font-size: 14px; }

.site-foot { border-top: 1px solid var(--line); margin-top: 64px; padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 8px; }
.site-foot a { color: var(--muted); }

/* 본문 */
.hero { padding: 64px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(28px, 6vw, 44px); line-height: 1.3; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p { color: var(--muted); font-size: 18px; margin: 0 auto 28px; max-width: 620px; }
.hero .cta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.dots { display: inline-flex; gap: 6px; margin-bottom: 18px; }
.dots i { width: 12px; height: 12px; border-radius: 50%; display: block; }

.section { padding: 32px 0; }
.section h2 { font-size: 24px; margin: 0 0 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; position: relative; padding: 0 0 14px 44px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 2px; width: 30px; height: 30px; border-radius: 50%; background: var(--soft); border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; }

article { padding: 40px 0 0; }
article h1 { font-size: clamp(26px, 5vw, 34px); line-height: 1.35; margin: 0 0 8px; letter-spacing: -0.01em; }
article .meta { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
article h2 { font-size: 22px; margin: 40px 0 12px; }
article h3 { font-size: 18px; margin: 28px 0 8px; }
article table { border-collapse: collapse; width: 100%; font-size: 15px; display: block; overflow-x: auto; }
article th, article td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
article th { background: var(--soft); }
.note { background: var(--soft); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 0 10px 10px 0; margin: 18px 0; }
.toc { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 20px; margin-bottom: 8px; }
.toc ol { margin: 6px 0 0; padding-left: 20px; }
code { font-family: "Cascadia Code", Consolas, monospace; background: var(--soft); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
details { border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin-bottom: 10px; background: var(--panel); }
details summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: var(--muted); }

/* 광고 자리 (AdSense 승인 후 사용) */
.ad-slot { margin: 28px 0; min-height: 0; }