/* THE101 — 공개 페이지 공통 스타일
   흑백만 쓴다. 색·라운드·그림자를 넣는 순간 프리미엄이 아니라 앱이 된다. */

@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css");

:root {
  --ink: #000;
  --paper: #fff;
  --mute: #7a7a7a;
  --line: #e4e4e4;
  --line-dark: #262626;
  --mute-dark: #8f8f8f;
  --pad: clamp(20px, 5vw, 40px);
  --max: 1120px;
  font-synthesis-weight: none;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }

/* 워드마크 ------------------------------------------------------------- */
.mark {
  font-weight: 300;
  letter-spacing: 0.22em;
  text-indent: 0.22em;       /* 자간 때문에 오른쪽이 뜨는 걸 상쇄 */
  white-space: nowrap;
}

/* 상단바 --------------------------------------------------------------- */
.top {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; padding: 0 var(--pad);
  color: #fff;
  transition: background .3s, color .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.top.solid { background: rgba(255,255,255,.94); backdrop-filter: blur(10px); color: var(--ink); border-bottom-color: var(--line); }
.top .mark { font-size: 15px; }
.top a.nav {
  font-size: 12px; letter-spacing: .12em; font-weight: 500;
  border-bottom: 1px solid currentColor; padding-bottom: 2px;
}

/* 히어로 --------------------------------------------------------------- */
.hero {
  min-height: 100svh;
  background: var(--ink); color: #fff;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 100px var(--pad) 56px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(52px, 16vw, 132px);
  line-height: 1;
  font-weight: 200;
}
.hero .tag {
  margin: 28px 0 0;
  font-size: clamp(15px, 3.6vw, 20px);
  font-weight: 300;
  letter-spacing: .02em;
  color: #f2f2f2;
}
.hero .sub {
  margin: 14px 0 0; font-size: 13px; color: var(--mute-dark);
  letter-spacing: .06em;
}
.hero .rule { width: 1px; height: 56px; background: #333; margin: 44px 0 40px; }

/* 버튼 ----------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 54px; padding: 0 40px;
  font-size: 14px; font-weight: 500; letter-spacing: .08em;
  border: 1px solid var(--ink); background: var(--ink); color: #fff;
  cursor: pointer; transition: background .2s, color .2s;
}
.btn:hover { background: transparent; color: var(--ink); }
.btn.inv { border-color: #fff; background: #fff; color: var(--ink); }
.btn.inv:hover { background: transparent; color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: #fff; }
.btn[disabled] { opacity: .45; pointer-events: none; }
.btn.wide { width: 100%; }

/* 섹션 ----------------------------------------------------------------- */
section { padding: clamp(72px, 12vw, 128px) 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: 0; }
.label {
  font-size: 11px; letter-spacing: .2em; font-weight: 600; color: var(--mute);
  margin: 0 0 22px;
}
h2 {
  margin: 0 0 24px;
  font-size: clamp(24px, 5.2vw, 38px); line-height: 1.35; font-weight: 400;
  letter-spacing: -0.02em;
}
.lead { margin: 0; font-size: clamp(15px, 3.4vw, 17px); color: #333; max-width: 62ch; }
.lead + .lead { margin-top: 18px; }

/* 목록형 블록 ---------------------------------------------------------- */
.rows { margin: 48px 0 0; border-top: 1px solid var(--line); }
.row {
  display: grid; grid-template-columns: 44px 1fr; gap: 0 18px;
  padding: 26px 0; border-bottom: 1px solid var(--line);
}
.row .no { font-size: 12px; letter-spacing: .1em; color: var(--mute); padding-top: 5px; }
.row h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.row p { margin: 0; font-size: 15px; color: #4a4a4a; }

@media (min-width: 720px) {
  .row { grid-template-columns: 90px 1fr; gap: 0 32px; }
  .row h3 { font-size: 19px; }
}

/* 마지막 CTA ----------------------------------------------------------- */
.cta { background: var(--ink); color: #fff; text-align: center; border-top: 0; }
.cta h2 { font-weight: 300; }
.cta .lead { color: #bdbdbd; margin-inline: auto; }
.cta .btn { margin-top: 40px; }

footer {
  background: var(--ink); color: var(--mute-dark);
  padding: 40px 0 56px; font-size: 12px; letter-spacing: .04em;
  border-top: 1px solid var(--line-dark);
}
footer .wrap { display: flex; flex-direction: column; gap: 10px; }
footer .mark { color: #fff; font-size: 13px; }