:root {
  color-scheme: dark;
  --bg: #070a12;
  --ink: #f8fbff;
  --muted: #a8b3c7;
  --line: rgba(214, 226, 255, .12);
  --paper: #101827;
  --navy: #0d1320;
  --blue: #2f7dff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans KR", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  border-bottom: 1px solid var(--line);
  background: rgba(7,10,18,.92);
  backdrop-filter: blur(16px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 950; }
.brand::before {
  content: "";
  width: 30px;
  aspect-ratio: 1;
  border-radius: 0;
    background: url("../assets/overplatform-symbol-transparent-v2.png?v=20260721-symbol-ring1") center / cover no-repeat;
}
.nav a:last-child, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  font-weight: 900;
  background: var(--paper);
}
.button.primary { border-color: var(--blue); color: #fff; background: var(--blue); }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 48px;
  align-items: center;
  padding: 68px 0 54px;
}
.kicker { color: var(--blue); font-size: 13px; font-weight: 950; letter-spacing: .08em; text-transform: uppercase; }
h1 {
  margin: 14px 0 18px;
  font-size: clamp(40px, 4.4vw, 56px);
  line-height: 1.08;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: break-word;
}
.lead { max-width: 650px; color: var(--muted); font-size: 19px; line-height: 1.72; }
.buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.visual {
  min-height: 390px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(7,10,18,.18), rgba(7,10,18,.5)),
    url("../assets/about-platform-black-hero-v3-road.png") center / cover no-repeat;
  box-shadow: 0 28px 80px rgba(0,0,0,.3);
  position: relative;
  overflow: hidden;
}
.visual::before {
  content: "";
  position: absolute;
  inset: 24px;
  border-radius: 12px;
  border: 1px solid rgba(47,125,255,.2);
  background: transparent;
}
.visual::after {
  content: attr(data-label);
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 24px;
  border: 1px solid rgba(214,226,255,.14);
  border-radius: 8px;
  padding: 18px;
  color: #fff;
  font-weight: 950;
  font-size: 25px;
  background: rgba(13,19,32,.9);
  backdrop-filter: blur(12px);
}
.section { padding: 44px 0; }
.section-head { max-width: 720px; margin-bottom: 22px; }
h2 { margin: 0 0 10px; font-size: clamp(28px, 4vw, 46px); letter-spacing: 0; }
.section-head p { margin: 0; color: var(--muted); line-height: 1.7; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--paper);
  box-shadow: none;
}
.card b { display: block; margin-bottom: 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); line-height: 1.64; }
.dark {
  margin: 36px 0 60px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 36px;
  color: #fff;
  background: linear-gradient(135deg, #0d1320, #101827);
}
.dark p { color: rgba(255,255,255,.72); }
@media (max-width: 820px) {
  .hero, .grid { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
  .visual { min-height: 300px; }
  .nav { gap: 12px; }
}