:root {
  color-scheme: dark;
  --bg: #020408;
  --panel: #061018;
  --line: rgba(76, 224, 255, 0.28);
  --cyan: #4ce0ff;
  --text: #edfaff;
  --muted: #8da8b2;
  --amber: #ffe2a0;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }

body {
  min-height: 100dvh;
  margin: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  background: radial-gradient(circle at 15% -20%, rgba(76, 224, 255, 0.11), transparent 35%), var(--bg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: 8px;
  left: 8px;
  padding: 10px 12px;
  transform: translateY(-160%);
  border: 1px solid var(--cyan);
  background: var(--panel);
  font-size: 12px;
}

.skip-link:focus { transform: translateY(0); }

.concept-header {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: max-content minmax(260px, 1fr) max-content;
  align-items: center;
  gap: clamp(16px, 3vw, 42px);
  min-height: 78px;
  padding: 12px clamp(16px, 3vw, 42px);
  border-bottom: 1px solid var(--line);
  background: rgba(2, 8, 12, 0.97);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 13px;
  font-weight: 700;
}

.reticle {
  width: 18px;
  height: 18px;
  flex: none;
  position: relative;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(76, 224, 255, 0.45);
}

.reticle::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.disclosure {
  min-width: 0;
  line-height: 1.35;
}

.disclosure strong,
.disclosure span { display: block; }

.disclosure strong {
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 11px;
}

.disclosure span {
  margin-top: 4px;
  color: var(--muted);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 12px;
}

.return-link {
  padding: 9px 12px;
  border: 1px solid var(--line);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 10px;
}

.return-link:hover,
.return-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.concept-shell {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 8px;
  padding: 8px;
}

.privacy-note,
.noscript-note {
  margin: 0;
  padding: 2px 6px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.analytics-frame {
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #03080d;
}

.noscript-note {
  position: fixed;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
}

@media (max-width: 760px) {
  .concept-header {
    grid-template-columns: 1fr max-content;
    gap: 8px 14px;
    padding: 10px 14px;
  }

  .disclosure {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .return-link {
    grid-column: 2;
    grid-row: 1;
  }

  .privacy-note { display: none; }
  .concept-shell { grid-template-rows: minmax(0, 1fr); }
}

@media (max-width: 460px) {
  .brand { font-size: 10px; letter-spacing: 0.1em; }
  .brand .reticle { width: 15px; height: 15px; }
  .return-link { padding: 8px; font-size: 9px; }
  .disclosure span { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}