/* Hub for saenghwal.kr: one calm page that points to each data tool. */
:root{--bg:#f7f6f2;--paper:#fff;--ink:#1d2330;--muted:#5f6675;--line:#e3e2dc;--accent:#2f5d50;color-scheme:light}
@media(prefers-color-scheme:dark){:root{--bg:#14171c;--paper:#1c2027;--ink:#eceef2;--muted:#a2a9b6;--line:#2b313b;--accent:#8cc7b4;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 "Pretendard","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif}
a{color:inherit}
.wrap{max-width:880px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-block:18px}
.brand{font-weight:800;font-size:1.3rem;text-decoration:none;color:var(--accent)}
.top nav{display:flex;gap:16px;font-size:.92rem;color:var(--muted)}
.top nav a{text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.intro{padding-block:40px 28px}
.intro h1{margin:0 0 14px;font-size:clamp(1.9rem,6vw,2.6rem);line-height:1.25;letter-spacing:-.02em;text-wrap:balance}
.intro p{margin:0;max-width:60ch;color:var(--muted)}
.tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;padding-bottom:48px}
.tool{display:grid;gap:8px;padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:16px;text-decoration:none;transition:border-color .15s}
.tool:hover,.tool:focus-visible{border-color:var(--accent);outline:none}
.tool h2{margin:0;font-size:1.3rem}
.tool p{margin:0;color:var(--muted)}
.tool small{color:var(--muted);font-size:.82rem}
.tag{justify-self:start;font-size:.78rem;font-weight:700;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);padding:3px 10px;border-radius:999px}
.prose{padding-block:24px 48px;max-width:68ch}
.prose h1{font-size:1.8rem;margin:0 0 16px}
.prose h2{font-size:1.15rem;margin:28px 0 8px}
.prose p,.prose li{color:var(--muted)}
.foot{border-top:1px solid var(--line);padding-block:20px 32px;font-size:.85rem;color:var(--muted)}
.foot p{margin:4px 0}
@media(prefers-reduced-motion:reduce){.tool{transition:none}}