:root {
  --bg: #0b1220;
  --bg-2: #111c33;
  --card: #ffffff;
  --muted: #f4f6fa;
  --text: #111827;
  --subtext: #4b5563;
  --line: #dde3ec;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --teal: #0f766e;
  --radius: 18px;
  --shadow: 0 14px 34px rgba(15, 23, 42, 0.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  color: var(--text);
  line-height: 1.68;
  background: #fff;
  word-break: keep-all;
}
a { color: inherit; }
.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  background: #fff;
  color: #111827;
  padding: 10px 14px;
  border-radius: 8px;
}
.skip-link:focus { left: 8px; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  color: #fff;
  background:
    radial-gradient(circle at 88% 8%, rgba(37, 99, 235, 0.34), transparent 31rem),
    radial-gradient(circle at 12% 90%, rgba(15, 118, 110, 0.24), transparent 27rem),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  padding-bottom: 72px;
}
.top-nav {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.brand { text-decoration: none; font-weight: 800; letter-spacing: -0.02em; }
.nav-links { display: flex; flex-wrap: wrap; gap: 20px; }
.nav-links a { color: #cbd5e1; text-decoration: none; font-size: 0.92rem; }
.nav-links a:hover, .nav-links a:focus { color: #fff; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.75fr);
  gap: 42px;
  align-items: center;
  padding-top: 64px;
}
.eyebrow {
  margin: 0 0 10px;
  color: #93c5fd;
  font-size: 0.79rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 800;
}
.eyebrow.dark { color: var(--accent); }
h1 {
  margin: 0;
  font-size: clamp(2.3rem, 5.2vw, 4.55rem);
  line-height: 1.08;
  letter-spacing: -0.06em;
}
h2 { margin: 0 0 14px; font-size: clamp(1.75rem, 3.3vw, 2.45rem); line-height: 1.22; letter-spacing: -0.045em; }
h3 { margin: 0 0 12px; font-size: 1.28rem; line-height: 1.4; letter-spacing: -0.025em; }
.lead { max-width: 760px; margin: 24px 0 0; color: #dbeafe; font-size: 1.12rem; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-badges span {
  border: 1px solid rgba(255,255,255,0.23);
  background: rgba(255,255,255,0.08);
  padding: 8px 12px;
  border-radius: 999px;
  color: #eef2ff;
  font-size: 0.9rem;
  font-weight: 700;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 17px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 800;
  transition: transform 0.15s ease, background 0.15s ease;
}
.button:hover, .button:focus { transform: translateY(-1px); }
.button.primary { background: var(--accent); color: #fff; }
.button.primary:hover, .button.primary:focus { background: var(--accent-dark); }
.button.secondary { color: #fff; border: 1px solid rgba(255,255,255,0.28); background: rgba(255,255,255,0.06); }
.button.secondary.dark-button { color: var(--accent-dark); border-color: #bfdbfe; background: #eff6ff; }
.button.secondary.dark-button:hover, .button.secondary.dark-button:focus { background: #dbeafe; }
.button.light { white-space: nowrap; background: #fff; color: var(--accent-dark); }
.profile-card {
  background: rgba(255,255,255,0.095);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}
.card-kicker { margin: 0 0 10px; color: var(--accent); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.09em; text-transform: uppercase; }
.profile-card .card-kicker { color: #bfdbfe; }
.profile-card dl { display: grid; gap: 13px; margin: 0; }
.profile-card dl div { border-top: 1px solid rgba(255,255,255,0.15); padding-top: 11px; }
.profile-card dt { color: #bfdbfe; font-size: 0.8rem; }
.profile-card dd { margin: 2px 0 0; color: #fff; font-weight: 700; }
.profile-note { margin: 18px 0 0; color: #cbd5e1; font-size: 0.88rem; }
.section { padding: 72px 0; }
.section.muted { background: var(--muted); }
.section-heading { max-width: 820px; margin-bottom: 30px; }
.section-heading p { margin: 0; color: var(--subtext); }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 26px 0 30px; }
.metrics article, .card, .project-card, .research-card, .contact-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.metrics article { padding: 24px; }
.metrics strong { display: block; color: var(--accent); font-size: 2.15rem; line-height: 1.1; letter-spacing: -0.055em; }
.metrics span { display: block; margin-top: 7px; color: var(--subtext); font-weight: 750; }
.grid { display: grid; gap: 20px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card, .project-card, .research-card { padding: 28px; }
.card ul, .project-card ul, .research-card ul { margin: 12px 0 0; padding-left: 1.2rem; }
.card li, .project-card li, .research-card li { margin: 7px 0; }
.compact li { margin: 5px 0; }
.research-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 28px; align-items: start; }
.research-heading { margin-bottom: 0; }
.research-card h3 { margin-top: 18px; font-size: 1.18rem; }
.status-row, .project-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.status, .project-meta span {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  background: #e5e7eb;
  color: #374151;
  font-size: 0.76rem;
  font-weight: 800;
}
.status.accepted { background: #dcfce7; color: #166534; }
.status.poc { background: #dbeafe; color: #1d4ed8; }
.status.in-progress { background: #fef3c7; color: #92400e; }
.fine-print { margin: 16px 0 0; color: var(--subtext); font-size: 0.86rem; }
.project-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.project-meta { margin-bottom: 13px; }
.project-meta span:not(.status) { background: #ccfbf1; color: var(--teal); }
.project-card p { margin: 0; color: var(--subtext); }
.contact-section { background: var(--bg); color: #fff; }
.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 34px;
  color: #fff;
  background: linear-gradient(135deg, rgba(37,99,235,0.26), rgba(15,118,110,0.18));
  border-color: rgba(255,255,255,0.14);
}
.contact-card p { margin: 0; color: #dbeafe; max-width: 780px; }
.site-footer { background: #070d18; color: #94a3b8; padding: 26px 0; font-size: 0.88rem; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-inner p { margin: 0; }
.footer-inner a { color: #cbd5e1; }
@media (max-width: 880px) {
  .hero-grid, .grid.two, .metrics, .research-grid, .project-list { grid-template-columns: 1fr; }
  .top-nav { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .hero-grid { padding-top: 48px; }
  .site-header { padding-bottom: 56px; }
  .section { padding: 54px 0; }
  .contact-card { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 520px) {
  .container { width: min(100% - 28px, 1120px); }
  .nav-links { gap: 13px; }
  h1 { font-size: 2.35rem; }
  .metrics article, .card, .project-card, .research-card { padding: 22px; }
}