:root {
  --ink: #172033;
  --muted: #5d687a;
  --line: #d9e2ef;
  --surface: #ffffff;
  --surface-alt: #f4f7fb;
  --navy: #0b2e59;
  --blue: #1465c0;
  --teal: #0f8b8d;
  --green: #23825f;
  --gold: #b7791f;
  --shadow: 0 14px 36px rgba(20, 40, 70, 0.12);
  --radius: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  background: var(--surface);
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: var(--navy);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--navy), var(--teal));
  border-radius: 8px;
  font-size: 14px;
  letter-spacing: 0;
}

.brand-text { display: grid; line-height: 1.25; }
.brand-text small { font-weight: 600; color: var(--muted); }

.brand--logo {
  min-width: 0;
}

.brand-logo {
  width: 245px;
  height: auto;
  max-height: 58px;
  object-fit: contain;
}

.brand--logo .brand-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.site-nav { display: flex; align-items: center; gap: 4px; }

.site-nav a {
  padding: 26px 14px;
  font-weight: 700;
  color: #25314a;
  border-bottom: 3px solid transparent;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.site-nav a:focus-visible,
.button:focus-visible,
.nav-toggle:focus-visible,
.tab-button:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  color: var(--navy);
  font-size: 22px;
}

.hero {
  min-height: 560px;
  display: grid;
  align-items: center;
  background:
    linear-gradient(90deg, rgba(9, 31, 60, 0.94), rgba(14, 66, 104, 0.8), rgba(15, 139, 141, 0.58)),
    repeating-linear-gradient(120deg, rgba(255,255,255,0.16) 0 1px, transparent 1px 34px),
    url("../../assets/media/hero-futuristic-transport.png") center / cover no-repeat;
  color: #fff;
}

.hero-content { width: min(820px, 100%); padding: 86px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
}

.hero h1,
.page-hero h1 {
  margin: 18px 0 18px;
  font-size: 58px;
  line-height: 1.16;
  letter-spacing: 0;
}

.hero-title-line {
  display: block;
  white-space: nowrap;
}

.hero p,
.page-hero p {
  max-width: 720px;
  margin: 0;
  font-size: 19px;
  color: rgba(255,255,255,0.9);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border: 1px solid var(--blue);
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

.button.secondary { background: #fff; color: var(--blue); }
.button.ghost { border-color: rgba(255, 255, 255, 0.58); background: rgba(255, 255, 255, 0.08); color: #fff; }

.section { padding: 78px 0; }
.section.alt { background: var(--surface-alt); }
.section-heading { margin-bottom: 30px; }

.section-heading h2 {
  margin: 0 0 10px;
  font-size: 38px;
  line-height: 1.25;
  letter-spacing: 0;
}

.section-heading p { max-width: 760px; margin: 0; color: var(--muted); }

.grid { display: grid; gap: 22px; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  min-height: 100%;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 8px 22px rgba(20, 40, 70, 0.06);
}

.card h3 { margin: 0 0 10px; font-size: 22px; line-height: 1.35; }
.card p { margin: 0; color: var(--muted); }

.icon-tile {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--navy);
  font-weight: 900;
}

.page-hero {
  padding: 86px 0;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(11, 46, 89, 0.92), rgba(20, 101, 192, 0.72)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.12) 0 1px, transparent 1px 28px),
    #0b2e59;
}

.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }

.tab-button {
  min-height: 38px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.tab-button.is-active { border-color: var(--blue); background: var(--blue); color: #fff; }

.notice-table { width: 100%; border-collapse: collapse; background: #fff; border-top: 2px solid var(--navy); }
.notice-table th, .notice-table td { padding: 15px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.notice-table th { color: var(--navy); background: #f7f9fc; }

.badge { display: inline-flex; align-items: center; min-height: 26px; padding: 3px 9px; border-radius: 999px; background: #e8f1fc; color: var(--blue); font-size: 13px; font-weight: 800; }

.research-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.research-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  border-top: 1px solid var(--line);
  background: #fff;
}

.research-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.research-list strong {
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink);
}

.research-list span {
  flex: 0 0 auto;
  color: var(--blue);
  font-weight: 800;
}

.member-card { display: grid; gap: 16px; }

.member-logo { min-height: 96px; display: flex; align-items: center; justify-content: center; overflow: hidden; isolation: isolate; padding: 12px 18px; border: 1px solid var(--line); border-radius: 8px; background: #f8fafc; }
.member-logo img { display: block; width: auto; max-width: min(100%, 240px); max-height: 62px; object-fit: contain; mix-blend-mode: multiply; }

.meta-list { display: grid; gap: 10px; margin: 0; }
.meta-list div { display: grid; gap: 3px; }
.meta-list dt { color: var(--navy); font-weight: 900; }
.meta-list dd { margin: 0; color: var(--muted); }

.org-diagram { display: grid; gap: 16px; }
.org-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.org-box { padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: #fff; text-align: center; font-weight: 900; }
.org-box.primary { background: var(--navy); color: #fff; }

.contact-panel { padding: 30px; border-radius: 8px; background: var(--navy); color: #fff; }
.contact-panel p { margin: 0; color: rgba(255,255,255,0.88); }

.map-panel { min-height: 300px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(135deg, rgba(20,101,192,0.08), rgba(15,139,141,0.16)), repeating-linear-gradient(0deg, rgba(11,46,89,0.08) 0 1px, transparent 1px 32px), #fff; text-align: center; }

.is-hidden { display: none; }

.site-footer { padding: 38px 0; background: #111827; color: rgba(255,255,255,0.82); }
.footer-inner { display: grid; gap: 10px; }
.footer-title { color: #fff; font-weight: 900; }

@media (max-width: 920px) {
  .nav-toggle { display: inline-grid; place-items: center; }
  .site-nav { position: absolute; left: 0; right: 0; top: 78px; display: none; flex-direction: column; align-items: stretch; padding: 10px 20px 18px; border-bottom: 1px solid var(--line); background: #fff; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 13px 8px; border-bottom: 1px solid var(--line); }
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1180px); }
  .brand-logo { width: 190px; max-height: 52px; }
  .brand-text span { font-size: 14px; }
  .brand-text small { display: none; }
  .hero { min-height: 520px; }
  .hero h1, .page-hero h1 { font-size: 40px; }
  .section-heading h2 { font-size: 28px; }
  .section { padding: 56px 0; }
  .grid.cols-2, .grid.cols-3, .grid.cols-4, .org-row { grid-template-columns: 1fr; }
  .research-list li { display: grid; gap: 6px; }
  .research-list span { flex: initial; }
  .notice-table { display: block; overflow-x: auto; white-space: nowrap; }
}