* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
}

/* ── Starfield ── */
#starfield {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* ── Scene ── */
.scene {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 52px;
  min-height: 100vh;
}

/* ── SVG orbital logo ── */
.logo-wrap {
  position: relative;
  flex-shrink: 0;
}

.logo-svg {
  display: block;
  overflow: visible;
}

/* Ring group — SVG transform-box needed */
.rg { transform-box: fill-box; transform-origin: center; }
.r1 { animation: cw  5s linear infinite; }
.r2 { animation: ccw 8s linear infinite; }
.r3 { animation: cw  12s linear infinite; }
.r4 { animation: ccw 16s linear infinite; }
.r5 { animation: cw  21s linear infinite; }
.r6 { animation: ccw 27s linear infinite; }
.r7 { animation: cw  34s linear infinite; }

@keyframes cw  { to { transform: rotate(360deg);  } }
@keyframes ccw { to { transform: rotate(-360deg); } }

/* ── Brand text ── */
.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-main {
  font-size: clamp(36px, 4.5vw, 64px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1;
  text-shadow: 0 0 40px rgba(0, 200, 255, 0.25);
}

.brand-sub {
  font-size: clamp(11px, 1.4vw, 18px);
  font-weight: 300;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  padding-left: 3px;
}

.brand-rule {
  width: 0;
  height: 1px;
  background: linear-gradient(to right, rgba(0,200,255,0.6), transparent);
  margin: 10px 0;
  animation: ruleGrow 2s ease-out 0.5s forwards;
}
@keyframes ruleGrow { to { width: 100%; } }

/* ── HUD ── */
.hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 20;
  color: rgba(0, 220, 180, 0.5);
  font-size: 10px;
  letter-spacing: 0.07em;
  font-family: 'Courier New', monospace;
}
.hud-c { position: absolute; padding: 22px 26px; line-height: 2; }
.hud-tl { top: 0; left: 0; }
.hud-tr { top: 0; right: 0; text-align: right; }
.hud-bl { bottom: 0; left: 0; }
.hud-br { bottom: 0; right: 0; text-align: right; }
.hl { display: block; }
.hl:nth-child(odd) { animation: hdim 6s steps(1) infinite; }
@keyframes hdim {
  0%,85%  { opacity: 1; }
  86%,92% { opacity: 0.15; }
  93%     { opacity: 1; }
}

/* ── Scan line ── */
.scan {
  position: fixed; left: 0; right: 0; height: 1px;
  background: linear-gradient(to right,
    transparent 0%, rgba(0,220,180,0.12) 25%,
    rgba(0,220,180,0.25) 50%, rgba(0,220,180,0.12) 75%, transparent 100%);
  animation: scanMove 7s linear infinite;
  z-index: 19; pointer-events: none;
}
@keyframes scanMove { from { top: -1px; } to { top: 100vh; } }

/* ── Corner brackets ── */
.brk {
  position: fixed; width: 36px; height: 36px;
  pointer-events: none; z-index: 21;
}
.brk::before, .brk::after {
  content: ''; position: absolute;
  background: rgba(0, 220, 180, 0.55);
}
.brk::before { width: 100%; height: 1.5px; }
.brk::after  { width: 1.5px; height: 100%; }
.brk-tl { top: 14px; left: 14px; }
.brk-tl::before, .brk-tl::after { top: 0; left: 0; }
.brk-tr { top: 14px; right: 14px; }
.brk-tr::before { top: 0; right: 0; }
.brk-tr::after  { top: 0; right: 0; }
.brk-bl { bottom: 14px; left: 14px; }
.brk-bl::before { bottom: 0; left: 0; }
.brk-bl::after  { bottom: 0; left: 0; }
.brk-br { bottom: 14px; right: 14px; }
.brk-br::before { bottom: 0; right: 0; }
.brk-br::after  { bottom: 0; right: 0; }

/* ── Start button ── */
.btn-start {
  margin-top: 28px;
  padding: 10px 36px;
  background: transparent;
  border: 1px solid rgba(0, 200, 255, 0.55);
  color: rgba(0, 200, 255, 0.9);
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.btn-start:hover {
  background: rgba(0, 200, 255, 0.12);
  box-shadow: 0 0 18px rgba(0, 200, 255, 0.3);
  color: #fff;
}

/* ── Entrance ── */
.scene { animation: fadeUp 1.2s cubic-bezier(0.16,1,0.3,1) both; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Universe section ── */
.universe {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px 24px 120px;
  gap: 40px;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  pointer-events: none;
}
.universe.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.universe-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.isg-logo {
  height: 80px;
  width: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.92;
}

.universe-tagline {
  font-size: 0.9rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(0, 200, 255, 0.6);
  font-weight: 300;
}

.universe-rule {
  width: 120px;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(0,200,255,0.5), transparent);
}

/* ── Section label ── */
.section-label {
  font-family: 'Courier New', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: rgba(0, 200, 255, 1);
  text-transform: uppercase;
  align-self: flex-start;
  max-width: 1200px;
  width: 100%;
}

/* ── Cards grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  width: 100%;
  max-width: 1200px;
}

.card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(0, 200, 255, 0.18);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.5s ease calc(var(--i) * 120ms + 400ms),
    transform 0.5s ease calc(var(--i) * 120ms + 400ms),
    background 0.25s,
    border-color 0.25s;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.universe.visible .card {
  opacity: 1;
  transform: translateY(0);
}
.card:hover {
  background: rgba(0, 200, 255, 0.06);
  border-color: rgba(0, 200, 255, 0.45);
}

.card-logo {
  height: 60px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  object-position: left center;
  margin-bottom: 4px;
}

.card-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(0, 200, 255, 0.55);
  font-family: 'Courier New', monospace;
}

.card-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.card-desc {
  font-size: 0.92rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.6;
  margin-top: 4px;
}

.card-toggle { display: none; }

.card-visit {
  display: none;
}

.card-hint {
  display: none;
}

@media (min-width: 701px) {
  .card-hint {
    display: block;
    margin-top: 10px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #fff;
  }
}


/* ── Universe bottom nav ── */
.universe-nav {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 8px;
}

/* ── Groupe button ── */
.btn-groupe {
  padding: 10px 36px;
  background: transparent;
  border: 1px solid rgba(0, 200, 255, 0.55);
  color: rgba(0, 200, 255, 0.9);
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.btn-groupe:hover {
  background: rgba(0, 200, 255, 0.12);
  box-shadow: 0 0 18px rgba(0, 200, 255, 0.3);
  color: #fff;
}

/* ── Groupe screen ── */
.groupe {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 60px 24px 120px;
  gap: 48px;
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  pointer-events: none;
}
.groupe.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.groupe .manifest-label,
.groupe .groupe-rule,
.groupe .groupe-text,
.groupe .btn-back {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.groupe.visible .manifest-label { opacity: 1; transform: translateY(0); transition-delay: 0.2s; }
.groupe.visible .groupe-rule     { opacity: 1; transform: translateY(0); transition-delay: 0.35s; }
.groupe.visible .groupe-text:nth-of-type(1) { opacity: 1; transform: translateY(0); transition-delay: 0.5s; }
.groupe.visible .groupe-text:nth-of-type(2) { opacity: 1; transform: translateY(0); transition-delay: 0.65s; }
.groupe.visible .btn-back        { opacity: 1; transform: translateY(0); transition-delay: 0.8s; }

.groupe-content {
  max-width: 640px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.manifest-label {
  display: block;
  font-family: 'Courier New', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: rgba(0, 200, 255, 0.5);
  text-transform: uppercase;
}

.groupe-rule {
  width: 48px;
  height: 1px;
  background: rgba(0, 200, 255, 0.35);
}

.groupe-text {
  font-size: 1.35rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.7;
  letter-spacing: -0.01em;
}
.groupe-text--dim {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.8;
}

/* ── Back button ── */
.btn-back {
  margin-top: 8px;
  padding: 10px 36px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.4);
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-back:hover {
  border-color: rgba(255, 255, 255, 0.45);
  color: rgba(255, 255, 255, 0.85);
}

/* ── Responsive ── */
@media (max-width: 1000px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .isg-logo { display: none; }

  .universe-tagline {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
  }

  .card-desc {
    display: none;
  }
  .card-toggle {
    display: none;
  }
  .card-visit {
    display: none;
  }
  .card-hint {
    display: block;
    margin-top: 12px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #fff;
  }

  .scene {
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    padding: 16px;
  }

  .logo-svg {
    width: 260px;
    height: 260px;
  }

  .brand {
    align-items: center;
    text-align: center;
  }

  .brand-main {
    font-size: clamp(32px, 10vw, 48px);
  }

  .brand-sub {
    font-size: clamp(10px, 3vw, 14px);
  }

  .brand-rule {
    width: 100%;
    animation: none;
  }

  .hud-c {
    font-size: 8px;
    padding: 10px 12px;
    line-height: 1.8;
  }

  .brk {
    width: 24px;
    height: 24px;
  }

  .brk-tl { top: 8px; left: 8px; }
  .brk-tr { top: 8px; right: 8px; }
  .brk-bl { bottom: 8px; left: 8px; }
  .brk-br { bottom: 8px; right: 8px; }
}

@media (max-width: 420px) {
  .hud-bl, .hud-br { display: none; }

  .logo-svg {
    width: 200px;
    height: 200px;
  }

  .hud-c {
    font-size: 7px;
    padding: 8px 10px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .isg-logo {
    height: 44px;
  }
}