:root {
  /* DESIGN typography tokens: Space Grotesk** in 700 weight for the `namu.club` wordmark */
  --midnight: #071B3A;
  --ink: #05070D;
  --frost: #C7E8FF;
  --red: #FF3B3F;
  --cyan: #20F2D0;
  --yellow: #FFE45C;
  --magenta: #D946EF;
  --display: "Space Grotesk", "Arial Black", system-ui, sans-serif;
  --label: "Archivo", Impact, system-ui, sans-serif;
  --body: "Noto Sans KR", Arial, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--midnight);
  color: var(--frost);
  font-family: var(--body);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 18%, rgba(255, 228, 92, .16) 0 2px, transparent 3px) 0 0 / 18px 18px,
    linear-gradient(120deg, rgba(217, 70, 239, .13), transparent 36%, rgba(32, 242, 208, .11));
  pointer-events: none;
  z-index: 0;
}

.print-noise {
  position: fixed;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(5, 7, 13, .18) 0 1px, transparent 1px 5px);
  mix-blend-mode: multiply;
  pointer-events: none;
  z-index: 20;
}

main { position: relative; z-index: 2; }

.registry-path {
  position: fixed;
  left: 24px;
  top: 0;
  width: 390px;
  height: 100vh;
  z-index: 3;
  overflow: visible;
  pointer-events: none;
}

#branchPath {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(5px 5px 0 var(--ink));
}

.path-node {
  fill: var(--yellow);
  stroke: var(--ink);
  stroke-width: 7;
  opacity: .95;
}

.club-spine {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 104px;
  background: var(--ink);
  border-right: 6px solid var(--cyan);
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 20px 10px;
}

.spine-seal {
  width: 66px;
  height: 92px;
  display: grid;
  place-items: center;
  background: var(--red);
  color: var(--yellow);
  border: 5px solid var(--yellow);
  box-shadow: 8px 8px 0 var(--magenta);
  font-family: var(--label);
  font-size: 34px;
  font-weight: 900;
}

.spine-nav { display: grid; gap: 14px; width: 100%; }

.spine-nav button {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  min-height: 96px;
  background: transparent;
  color: var(--frost);
  border: 2px solid rgba(199, 232, 255, .35);
  font-family: var(--label);
  font-weight: 900;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background .25s, color .25s, transform .25s;
}

.spine-nav button.active {
  background: var(--yellow);
  color: var(--ink);
  transform: rotate(180deg) translateX(-4px);
}

.spine-code {
  writing-mode: vertical-rl;
  font: 900 12px/1.1 var(--label);
  color: var(--cyan);
  letter-spacing: .18em;
}

.chapter {
  position: relative;
  min-height: 100vh;
  padding: 0 5vw 8vh 150px;
  overflow: hidden;
}

.masthead {
  height: 88px;
  margin-left: -150px;
  padding-left: 150px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--ink);
  border-bottom: 7px solid var(--cyan);
  box-shadow: 0 9px 0 var(--red);
  font-family: var(--label);
  font-weight: 900;
  letter-spacing: .08em;
}

.mast-label { color: var(--yellow); font-size: clamp(18px, 3vw, 34px); }
.mast-code { padding-right: 4vw; color: var(--frost); }

.info-rail {
  margin-left: -46px;
  width: calc(100% + 46px);
  min-height: 52px;
  display: flex;
  gap: 12px;
  align-items: center;
  background: var(--yellow);
  color: var(--ink);
  border: 5px solid var(--ink);
  border-left: 0;
  box-shadow: 10px 10px 0 var(--magenta);
  font-family: var(--label);
  font-weight: 900;
  padding: 8px 22px;
}

.info-rail span { border-right: 4px solid var(--ink); padding-right: 18px; }

.hero-title-wrap { position: relative; padding-top: 28px; }

h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(76px, 16vw, 230px);
  letter-spacing: -.09em;
  line-height: .75;
  color: var(--frost);
  text-shadow: 9px 9px 0 var(--ink), 17px 17px 0 var(--red), -7px -4px 0 var(--magenta);
  transform: translateX(-12px);
}

.burst {
  position: absolute;
  right: 8vw;
  top: 8px;
  width: clamp(140px, 20vw, 260px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: radial-gradient(circle, var(--yellow) 0 2px, transparent 3px) 0 0 / 13px 13px, var(--yellow);
  color: var(--ink);
  clip-path: polygon(50% 0,58% 28%,85% 10%,73% 40%,100% 50%,72% 60%,88% 88%,58% 72%,50% 100%,42% 72%,12% 88%,28% 60%,0 50%,27% 40%,15% 10%,42% 28%);
  filter: drop-shadow(9px 9px 0 var(--ink));
  animation: burstPulse 2.8s ease-in-out infinite;
}

.burst span { font: 900 clamp(16px, 2.4vw, 32px) var(--label); transform: rotate(-10deg); }

.panel-ink, .dossier-card, .membership-file, .quiet-panel {
  border: 6px solid var(--ink);
  box-shadow: 12px 12px 0 var(--ink), 19px 19px 0 var(--magenta);
}

.hero-copy {
  width: min(650px, 54vw);
  margin: 38px 0 0 28px;
  background: rgba(199, 232, 255, .16);
  backdrop-filter: blur(12px);
  padding: 26px;
}

.eyebrow, .chapter-label { font: 900 14px var(--label); color: var(--cyan); letter-spacing: .18em; }
.hero-copy h2, .red-panel h2, .closing-chapter h2 { font: 700 clamp(32px, 5vw, 74px)/.9 var(--display); margin: 8px 0 12px; }
.hero-copy p, .red-panel p, .branch-board p, .quiet-panel p, .membership-file p { font-size: clamp(16px, 1.45vw, 22px); line-height: 1.45; }

.dossier-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(210px, 1fr));
  gap: 26px;
  margin: 52px 0 0 78px;
  max-width: 1060px;
}

.dossier-card {
  position: relative;
  min-height: 255px;
  padding: 22px;
  background: linear-gradient(135deg, rgba(199, 232, 255, .36), rgba(199, 232, 255, .08));
  backdrop-filter: blur(18px);
  color: var(--frost);
  transform: translateY(26px);
  opacity: 0;
  transition: opacity .7s, transform .7s;
}

.dossier-card.visible { opacity: 1; transform: translateY(0); }
.card-two { margin-top: 52px; }
.card-three { margin-top: 104px; }
.reg { font: 900 13px var(--label); color: var(--yellow); }
.dossier-card h3 { font: 700 32px/.96 var(--display); margin: 18px 0 12px; color: white; }
.dossier-card::after, .membership-file::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 76px;
  height: 76px;
  background: radial-gradient(circle, var(--red) 0 2px, transparent 3px) 0 0 / 10px 10px;
  opacity: .8;
}

.icon { display: block; width: 70px; height: 52px; margin-top: 14px; border: 4px solid var(--ink); background: var(--cyan); box-shadow: 6px 6px 0 var(--red); }
.root-icon { clip-path: polygon(0 42%,28% 42%,42% 0,52% 42%,82% 13%,65% 52%,100% 52%,60% 64%,72% 100%,50% 70%,28% 100%,38% 64%); }
.leaf-key { border-radius: 60% 0 60% 0; }
.signal-icon { border-radius: 50%; }

.network-chapter { padding-top: 14vh; }
.chapter-label { margin: 0 0 32px 24px; display: inline-block; background: var(--ink); padding: 12px 18px; border: 4px solid var(--cyan); box-shadow: 8px 8px 0 var(--red); }
.chapter-label.magenta { border-color: var(--magenta); color: var(--yellow); }

.diagonal-panel {
  width: min(870px, 78vw);
  padding: 46px;
  background: var(--red);
  color: white;
  transform: skew(-7deg) translateX(38px);
  border: 7px solid var(--ink);
  box-shadow: 16px 16px 0 var(--yellow), 25px 25px 0 var(--ink);
}
.diagonal-panel > * { transform: skew(7deg); }
.red-panel h2 { color: var(--yellow); text-shadow: 6px 6px 0 var(--ink); }

.branch-board {
  width: min(720px, 70vw);
  margin: 70px 0 0 22vw;
  padding: 28px;
  background: rgba(199, 232, 255, .14);
  backdrop-filter: blur(14px);
}
.mini-circuit { width: 100%; height: auto; }
.mini-circuit path, .mini-circuit circle { fill: none; stroke: var(--cyan); stroke-width: 10; stroke-linecap: round; stroke-linejoin: round; }
.mini-circuit circle { fill: var(--yellow); stroke: var(--ink); }
.stamp { display: inline-block; margin-top: -20px; padding: 12px 20px; border: 5px solid var(--ink); font: 900 28px var(--label); transform: rotate(-6deg); }
.stamp-red { background: var(--red); color: var(--yellow); box-shadow: 7px 7px 0 var(--magenta); }

.artifact-chapter { padding-top: 11vh; }
.oversize {
  margin: 0 0 24px 20px;
  font: 700 clamp(58px, 11vw, 156px)/.82 var(--display);
  letter-spacing: -.07em;
  color: var(--yellow);
  text-shadow: 8px 8px 0 var(--ink), 15px 15px 0 var(--red);
}
.artifact-stack { position: relative; min-height: 430px; }
.membership-file {
  position: absolute;
  width: min(420px, 34vw);
  min-height: 275px;
  padding: 24px;
  background: rgba(199, 232, 255, .22);
  backdrop-filter: blur(16px);
  transition: transform .5s;
}
.membership-file span { font: 900 13px var(--label); color: var(--cyan); letter-spacing: .16em; }
.membership-file b { display: block; margin: 22px 0; font: 900 58px var(--label); color: var(--yellow); text-shadow: 5px 5px 0 var(--red); }
.file-a { left: 4vw; top: 20px; transform: rotate(-5deg); }
.file-b { left: 34vw; top: 90px; transform: rotate(4deg); }
.file-c { left: 18vw; top: 270px; transform: rotate(-2deg); background: rgba(217, 70, 239, .22); }
.membership-file.lift { transform: translateY(-18px) rotate(0deg) scale(1.03); }

.closing-chapter { display: grid; place-items: center; padding-top: 8vh; }
.quiet-panel {
  width: min(860px, 76vw);
  padding: clamp(34px, 6vw, 78px);
  background: linear-gradient(135deg, rgba(5, 7, 13, .88), rgba(7, 27, 58, .92));
  position: relative;
}
.seal-ring {
  position: absolute;
  right: -36px;
  top: -36px;
  width: 138px;
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--magenta);
  border: 7px solid var(--ink);
  color: var(--yellow);
  font: 900 24px var(--label);
  box-shadow: 9px 9px 0 var(--cyan);
}
.stamp-button {
  border: 6px solid var(--ink);
  background: var(--yellow);
  color: var(--ink);
  padding: 18px 26px;
  font: 900 20px var(--label);
  box-shadow: 9px 9px 0 var(--red);
  cursor: pointer;
  transform: rotate(-2deg);
  transition: transform .18s, box-shadow .18s;
}
.stamp-button.stamped { transform: rotate(2deg) translateY(5px); box-shadow: 3px 3px 0 var(--red); background: var(--cyan); }

@keyframes burstPulse { 0%, 100% { transform: rotate(5deg) scale(1); } 50% { transform: rotate(-2deg) scale(1.07); } }

@media (max-width: 900px) {
  .club-spine { width: 74px; }
  .chapter { padding-left: 96px; padding-right: 22px; }
  .masthead { margin-left: -96px; padding-left: 96px; display: grid; height: auto; gap: 8px; padding-top: 16px; padding-bottom: 16px; }
  .info-rail { flex-wrap: wrap; margin-left: 0; width: 100%; }
  .registry-path { left: -24px; width: 280px; opacity: .75; }
  .dossier-row { grid-template-columns: 1fr; margin-left: 14px; }
  .card-two, .card-three { margin-top: 0; }
  .hero-copy, .branch-board, .diagonal-panel, .quiet-panel { width: 100%; margin-left: 0; }
  .membership-file { position: relative; left: auto; top: auto; width: 100%; margin: 22px 0; }
  .artifact-stack { min-height: auto; }
}