:root {
  --bg: #050a16;
  --bg-soft: #0f1a30;
  --text: #f4f8ff;
  --muted: #b7c7df;
  --gold: #9fe6ff;
  --line: rgba(134, 201, 255, 0.24);
  --line-soft: rgba(255, 255, 255, 0.12);
  --panel: rgba(3, 8, 20, 0.58);
  --overlay: linear-gradient(to top, rgba(2, 4, 10, 0.82), rgba(2, 4, 10, 0.38) 52%, rgba(2, 4, 10, 0.14));
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: "Avenir Next", "Pretendard Variable", "Noto Sans KR", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.top-rail {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 22px;
  background: linear-gradient(to bottom, rgba(4, 12, 26, 0.92), rgba(4, 12, 26, 0.38));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.wordmark {
  color: var(--gold);
  text-decoration: none;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  white-space: nowrap;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.top-nav a {
  color: #ecf6ff;
  text-decoration: none;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.04);
  min-height: 36px;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.lang-shell {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.06);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #d2deef;
  font-weight: 700;
}

.lang-shell select {
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  outline: none;
}

.btn-primary,
.btn-ghost {
  min-height: 38px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  text-decoration: none;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid transparent;
}

.btn-primary {
  border-color: rgba(138, 220, 255, 0.7);
  background: linear-gradient(130deg, #3fa9d5, #2a7eb4);
  color: #f6fcff;
}

.btn-ghost {
  border-color: var(--line-soft);
  background: rgba(255, 255, 255, 0.04);
  color: #f0f3fb;
}

.snap-shell {
  height: 100vh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
}

.panel-slide {
  min-height: 100vh;
  scroll-snap-align: start;
  display: flex;
  align-items: flex-end;
  position: relative;
  padding: 90px 36px 42px;
}

.panel-slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay);
}

.hero-slide {
  background:
    radial-gradient(circle at 15% 15%, rgba(124, 208, 255, 0.18), transparent 34%),
    linear-gradient(120deg, rgba(16, 26, 44, 0.26), rgba(8, 11, 17, 0.58)),
    url("/media/bright-pearl-origin.jpg") center center / cover no-repeat;
}

.modules-slide {
  background:
    radial-gradient(circle at 80% 20%, rgba(110, 221, 255, 0.14), transparent 42%),
    linear-gradient(120deg, rgba(14, 22, 36, 0.42), rgba(7, 10, 16, 0.62)),
    url("/media/simple-symbol.jpg") center center / cover no-repeat;
}

.security-slide {
  background:
    radial-gradient(circle at 20% 20%, rgba(231, 197, 142, 0.18), transparent 42%),
    radial-gradient(circle at 84% 74%, rgba(137, 184, 255, 0.2), transparent 46%),
    linear-gradient(145deg, #0b1322, #0f1a2f 46%, #121a2b);
}

.boundary-slide {
  background:
    linear-gradient(120deg, rgba(14, 18, 28, 0.42), rgba(9, 13, 21, 0.66)),
    url("/media/bright-pearl-symbol.jpg") center center / cover no-repeat;
}

.panel-inner {
  position: relative;
  z-index: 1;
  width: min(1100px, 100%);
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(12px);
  border-radius: 26px;
  padding: 22px;
  box-shadow:
    0 16px 40px rgba(2, 14, 34, 0.45),
    inset 0 1px 0 rgba(190, 233, 255, 0.2);
}

.eyebrow {
  margin: 0;
  color: var(--gold);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.headline {
  margin: 12px 0 0;
  font-size: clamp(56px, 9vw, 112px);
  line-height: 0.95;
  font-weight: 650;
  text-shadow: 0 8px 28px rgba(46, 140, 198, 0.28);
}

.sub-headline {
  margin: 12px 0 0;
  font-size: clamp(21px, 2.4vw, 38px);
  line-height: 1.18;
  font-weight: 600;
  color: #f4e6cc;
}

.section-title {
  margin: 10px 0 0;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.1;
  font-weight: 600;
}

.body-copy {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 860px;
  line-height: 1.72;
  font-size: 14px;
}

.chip-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
  color: #d5deee;
}

.action-row {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.module-track {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.module-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  border-radius: 18px;
  border: 1px solid rgba(128, 212, 255, 0.3);
  background: linear-gradient(130deg, rgba(16, 36, 64, 0.82), rgba(8, 17, 33, 0.82));
  padding: 14px;
  box-shadow: inset 0 1px 0 rgba(180, 232, 255, 0.14);
}

.module-card:hover {
  border-color: rgba(142, 221, 255, 0.82);
}

.module-kicker {
  color: #8be4ff;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 10px;
  margin: 0;
}

.module-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.22;
}

.module-copy {
  margin: 0;
  font-size: 12px;
  line-height: 1.58;
  color: var(--muted);
}

.module-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.module-chip {
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 5px 9px;
  font-size: 10px;
  color: #d7e2f4;
}

.module-link {
  margin-top: auto;
  display: inline-flex;
  width: fit-content;
  min-height: 30px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(152, 225, 255, 0.5);
  color: #eaf9ff;
  padding: 6px 10px;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sector-tape {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sector-pill {
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 11px;
  color: #d1e5f7;
  background: rgba(255, 255, 255, 0.04);
}

.principle-grid,
.boundary-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.boundary-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.principle-card,
.boundary-card {
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.17);
  background: linear-gradient(130deg, rgba(15, 22, 37, 0.84), rgba(7, 10, 15, 0.8));
  padding: 14px;
}

.card-kicker {
  margin: 0;
  color: #8fb3f0;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.card-title {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.2;
}

.card-body {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.footer-note {
  margin-top: 16px;
  color: #b9c4d7;
  font-size: 12px;
  line-height: 1.7;
}

@media (max-width: 1080px) {
  .module-track,
  .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .top-rail {
    flex-wrap: wrap;
    padding: 12px;
  }

  .top-nav {
    order: 3;
    width: 100%;
  }

  .panel-slide {
    padding: 118px 12px 20px;
  }

  .panel-inner {
    padding: 16px;
  }

  .module-track,
  .principle-grid,
  .boundary-grid {
    grid-template-columns: 1fr;
  }

  .headline {
    font-size: clamp(46px, 16vw, 84px);
  }
}