:root {
  color-scheme: light;
  --bg: #f8f5ef;
  --text: #141414;
  --muted: rgba(20, 20, 20, 0.08);
  --button-bg: rgba(255, 255, 255, 0.82);
  --button-border: rgba(20, 20, 20, 0.14);
  --button-shadow: rgba(10, 10, 10, 0.08);
  --card-bg: rgba(255, 255, 255, 0.58);
  --card-border: rgba(20, 20, 20, 0.12);
  --card-shadow: rgba(10, 10, 10, 0.08);
  --code-bg: rgba(125, 60, 255, 0.08);
  --page-glow: rgba(125, 60, 255, 0.12);
  --accent: #7d3cff;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #08090d;
  --text: #f5f1ea;
  --muted: rgba(245, 241, 234, 0.16);
  --button-bg: rgba(15, 17, 23, 0.88);
  --button-border: rgba(245, 241, 234, 0.18);
  --button-shadow: rgba(0, 0, 0, 0.24);
  --card-bg: rgba(15, 17, 23, 0.74);
  --card-border: rgba(245, 241, 234, 0.16);
  --card-shadow: rgba(0, 0, 0, 0.26);
  --code-bg: rgba(169, 140, 255, 0.12);
  --page-glow: rgba(169, 140, 255, 0.13);
  --accent: #a98cff;
}

html[data-theme="bog"] {
  color-scheme: light;
  --bg: #eef0d4;
  --text: #182112;
  --muted: rgba(24, 33, 18, 0.11);
  --button-bg: rgba(255, 248, 214, 0.78);
  --button-border: rgba(69, 92, 44, 0.26);
  --button-shadow: rgba(48, 70, 32, 0.12);
  --card-bg: rgba(255, 248, 214, 0.62);
  --card-border: rgba(69, 92, 44, 0.18);
  --card-shadow: rgba(48, 70, 32, 0.12);
  --code-bg: rgba(99, 117, 44, 0.12);
  --page-glow: rgba(141, 118, 45, 0.18);
  --accent: #4f6f24;
}

html[data-theme="signal"] {
  color-scheme: dark;
  --bg: #03111f;
  --text: #f2fbff;
  --muted: rgba(195, 232, 255, 0.18);
  --button-bg: rgba(5, 30, 52, 0.9);
  --button-border: rgba(105, 217, 255, 0.34);
  --button-shadow: rgba(0, 11, 24, 0.32);
  --card-bg: rgba(5, 30, 52, 0.78);
  --card-border: rgba(105, 217, 255, 0.24);
  --card-shadow: rgba(0, 11, 24, 0.34);
  --code-bg: rgba(105, 217, 255, 0.12);
  --page-glow: rgba(0, 192, 255, 0.18);
  --accent: #69d9ff;
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, var(--page-glow), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans", Inter, "Avenir Next", "Segoe UI", Arial, sans-serif;
  font-weight: 500;
  -webkit-font-smoothing: antialiased;
  transition: background-color 320ms ease, color 320ms ease;
}

.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 2;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--text);
  padding: 0.78rem 1rem;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  text-transform: uppercase;
  box-shadow: 0 18px 36px var(--button-shadow);
  transition:
    background-color 320ms ease,
    border-color 320ms ease,
    color 320ms ease,
    box-shadow 320ms ease,
    transform 220ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.theme-toggle:focus-visible,
.nav-pill:focus-visible,
.artifact-card a:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 4px;
}

.theme-toggle.is-spinning {
  animation: theme-toggle-spin 540ms cubic-bezier(0.22, 1, 0.36, 1);
}

.page-nav {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  padding: clamp(4.5rem, 12vh, 8rem) 1.25rem 0;
  flex-wrap: wrap;
}

.nav-pill,
.page-nav__title {
  margin: 0;
  padding: 0.9rem 1.8rem;
  border: 1px solid var(--muted);
  border-radius: 999px;
  color: var(--text);
  background: transparent;
  font-size: clamp(1.05rem, 2vw, 1.8rem);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
  transition: border-color 320ms ease, background-color 320ms ease, transform 220ms ease;
}

.nav-pill:hover {
  transform: translateY(-1px);
  background: var(--card-bg);
}

.nav-pill[aria-current="page"] {
  border-color: var(--button-border);
  background: var(--button-bg);
}

.hero,
.artifacts-shell {
  width: min(980px, calc(100% - 2rem));
  margin: clamp(3rem, 8vh, 5rem) auto 0;
}

.hero {
  text-align: center;
}

.hero__eyebrow,
.artifact-card__meta {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 12vw, 8rem);
  line-height: 0.9;
  letter-spacing: -0.08em;
  text-transform: uppercase;
}

.hero__copy {
  width: min(620px, 100%);
  margin: 1.25rem auto 0;
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.6;
}

.artifacts-featured {
  margin-bottom: 1.5rem;
}

.artifacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.artifact-card {
  min-height: 18rem;
  border: 1px solid var(--card-border);
  border-radius: 1.5rem;
  background: var(--card-bg);
  padding: 1.25rem;
  box-shadow: 0 24px 60px var(--card-shadow);
  backdrop-filter: blur(18px);
}

.artifact-card h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.35rem, 3vw, 2.2rem);
  line-height: 1;
}

.artifact-card p {
  line-height: 1.6;
}

.artifact-link {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--text);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.artifact-card pre {
  overflow-x: auto;
  border: 1px dashed var(--button-border);
  border-radius: 1rem;
  padding: 1rem;
  background: var(--code-bg);
  color: var(--text);
  font: 0.85rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.artifact-status {
  margin-top: 1rem;
  color: var(--text);
  opacity: 0.72;
}

@keyframes theme-toggle-spin {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.08); }
  100% { transform: rotate(360deg) scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  body,
  .theme-toggle,
  .nav-pill,
  .page-nav__title {
    transition: none;
  }

  .theme-toggle.is-spinning {
    animation: none;
  }
}