:root {
  color-scheme: light;
  --bg: #fafaf8; --card: #fff; --text: #14161b; --muted: #5c6370; --line: #e6e7ea;
  --accent: #3b4fd8; --accent2: #1a8a64; --soft: #f1f2f6;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme=light]) { color-scheme: dark; --bg: #0e1014; --card: #161920; --text: #ecedf0; --muted: #9ba2ae; --line: #262a33; --accent: #8c9bff; --accent2: #5fc79f; --soft: #1a1d25; }
}
:root[data-theme=dark] { color-scheme: dark; --bg: #0e1014; --card: #161920; --text: #ecedf0; --muted: #9ba2ae; --line: #262a33; --accent: #8c9bff; --accent2: #5fc79f; --soft: #1a1d25; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Segoe UI", sans-serif; }
a { color: inherit; }
header, main, footer { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding-top: 20px; padding-bottom: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-size: 19px; letter-spacing: -0.02em; }
.brand .mark { width: 32px; height: 32px; }
.brand.small { font-size: 15px; } .brand.small .mark { width: 22px; height: 22px; }
nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
nav .lang { padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px; }
.theme-toggle { width: 34px; height: 34px; padding: 0; border: 1px solid var(--line); border-radius: 999px; background: var(--card); color: var(--text); font-size: 16px; cursor: pointer; }
.hero { padding: 72px 0 56px; }
.eyebrow { display: inline-block; margin: 0 0 18px; padding: 4px 12px; border-radius: 999px; background: var(--soft); color: var(--muted); font-size: 13px; font-weight: 600; }
h1 { font-size: clamp(36px, 6vw, 60px); line-height: 1.12; letter-spacing: -0.035em; margin: 0 0 20px; background: linear-gradient(120deg, var(--text) 30%, var(--accent) 70%, var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 640px; font-size: 19px; color: var(--muted); margin: 0 0 28px; }
.button { display: inline-block; padding: 12px 20px; border-radius: 10px; background: var(--text); color: var(--bg); text-decoration: none; font-weight: 700; }
section { padding: 36px 0; }
h2 { font-size: 26px; letter-spacing: -0.02em; margin: 0 0 22px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.card { position: relative; display: block; padding: 26px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); text-decoration: none; overflow: hidden; transition: transform .15s, border-color .15s; }
.card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--c); }
.card:hover { transform: translateY(-2px); border-color: var(--c); }
.card-top { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.card h3 { margin: 0; font-size: 21px; }
.host { font-size: 13px; color: var(--muted); }
.card p { color: var(--muted); margin: 12px 0 18px; }
.tags { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; font-size: 12px; }
.tags span { padding: 3px 10px; border-radius: 999px; background: var(--soft); color: var(--muted); }
.tags .go { margin-left: auto; background: none; color: var(--text); font-weight: 700; font-size: 14px; }
.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.principles div { padding: 22px; border-radius: 14px; background: var(--soft); }
.principles .num { font-size: 13px; font-weight: 800; color: var(--accent); }
.principles h3 { margin: 6px 0 8px; font-size: 18px; }
.principles p { margin: 0; color: var(--muted); font-size: 15px; }
.contact p { color: var(--muted); }
.doc { max-width: 720px; padding: 40px 0; }
.doc h1 { font-size: 34px; }
.doc a { color: var(--accent); }
.muted { color: var(--muted); font-size: 14px; }
footer { padding-top: 48px; padding-bottom: 48px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); margin-top: 40px; }
footer a { margin-right: 14px; }
@media (max-width: 560px) {
  nav > a:not(.lang) { display: none; }
  .hero { padding: 48px 0 36px; }
  .lead { font-size: 17px; }
}