* { box-sizing: border-box; }

html[data-theme="dark"] {
  --bg:               var(--ink-black);
  --bg-elevated:      #00222e;
  --bg-warm:          #1f160a;
  --bg-inverse:       var(--azure-mist);
  --fg:               var(--azure-mist);
  --fg-inverse:       var(--ink-black);
  --accent:           var(--tropical-teal);
  --accent-hover:     var(--neon-ice);
  --accent-press:     var(--teal);
  --accent-fg:        var(--ink-black);
  --border:           color-mix(in oklab, var(--azure-mist) 10%, transparent);
  --border-strong:    color-mix(in oklab, var(--azure-mist) 18%, transparent);
}

/* Light mode: white page, azure-mist elevated surfaces */
html:not([data-theme="dark"]) {
  --bg: #ffffff;
  --bg-elevated: var(--azure-mist);
}

html {
  background: var(--bg);
  transition: background var(--dur-slow) var(--ease-out);
}
body {
  background: transparent;
  color: var(--fg);
  min-height: 100vh;
  position: relative;
  transition: color var(--dur-slow) var(--ease-out);
}

.header-plane {
  position: absolute;
  top: 0;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.header-plane canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
@media (prefers-reduced-motion: reduce) {
  .header-plane { display: none; }
}

html {
  background-color: color-mix(in oklab, var(--teal) 6%, var(--bg));
  background-image: linear-gradient(
    to bottom,
    color-mix(in oklab, var(--teal) 6%, var(--bg)),
    var(--bg) 400px
  );
}

html[data-theme="dark"] {
  background-color: color-mix(in oklab, var(--tropical-teal) 6%, var(--ink-black));
  background-image: linear-gradient(
    to bottom,
    color-mix(in oklab, var(--tropical-teal) 6%, var(--ink-black)),
    var(--ink-black) 400px
  );
}

/* HEADER — subtle teal-tinted glass */
.header {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: min(760px, calc(100% - 40px));
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: color-mix(in oklab, color-mix(in oklab, var(--teal) 75%, var(--tropical-teal)) 20%, color-mix(in oklab, #ffffff 30%, transparent));
  color: var(--ink-black);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  box-shadow: 0 1px 0 0 color-mix(in oklab, var(--tropical-teal) 25%, transparent) inset, 0 -1px 0 0 color-mix(in oklab, var(--dark-teal) 15%, transparent) inset;
  transition: background var(--dur-slow) var(--ease-out), color var(--dur-slow) var(--ease-out), box-shadow 400ms var(--ease-out), width 300ms var(--ease-out), top 300ms var(--ease-out);
  backface-visibility: hidden;
}
html[data-theme="dark"] .header {
  background: color-mix(in oklab, var(--dark-teal) 28%, transparent);
  color: var(--azure-mist);
  box-shadow: 0 1px 0 0 color-mix(in oklab, var(--tropical-teal) 45%, transparent) inset, 0 -1px 0 0 rgba(0, 0, 0, 0.65) inset;
}
.header--floating {
  top: 18px;
  width: min(780px, calc(100% - 28px));
  box-shadow: 0 4px 12px color-mix(in oklab, #000 6%, transparent), 0 10px 32px color-mix(in oklab, #000 9%, transparent), 0 1px 0 0 color-mix(in oklab, var(--tropical-teal) 28%, transparent) inset, 0 -1px 0 0 color-mix(in oklab, var(--dark-teal) 17%, transparent) inset;
}
html[data-theme="dark"] .header--floating {
  box-shadow: 0 4px 12px color-mix(in oklab, #000 10%, transparent), 0 10px 32px color-mix(in oklab, #000 15%, transparent), 0 1px 0 0 color-mix(in oklab, var(--tropical-teal) 50%, transparent) inset, 0 -1px 0 0 rgba(0, 0, 0, 0.75) inset;
}
.header__bar {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 20px;
  flex-shrink: 0;
}
.header .brand { color: inherit; }
.header .theme-toggle { color: color-mix(in oklab, currentColor 70%, transparent); border-color: color-mix(in oklab, currentColor 25%, transparent); }
.header .theme-toggle:hover { color: currentColor; border-color: color-mix(in oklab, currentColor 50%, transparent); }
.brand {
  display: flex;
  align-items: center;
  align-self: stretch;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
  background-image: none;
  padding: 0 4px;
}
.brand .logo { margin: 0; line-height: 1; }
.header__nav {
  margin-left: auto;
  display: flex;
  gap: 4px;
  align-items: center;
  position: relative;
}
.nav-link {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  background-image: none;
  text-decoration: none;
  transition: color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}
.nav-link:hover { color: var(--fg); background: color-mix(in oklab, currentColor 10%, transparent); }
html[data-theme="dark"] .nav-link:hover { color: var(--neon-ice); }

/* Hamburger menu — hidden when inline links fit */
.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding: 0;
  margin-left: 4px;
  transition: color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.menu-toggle:hover { border-color: var(--accent); }
.menu-toggle:active { transform: scale(0.94); }
.menu-toggle svg { width: 18px; height: 18px; display: block; }
.menu-panel {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  padding: 0 16px;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-slow) var(--ease-out), padding var(--dur-slow) var(--ease-out);
}
.header[data-menu-open="true"] .menu-panel {
  max-height: 200px;
  padding: 10px 16px 14px;
}
.menu-panel a {
  padding: 6px 12px;
  font-size: 14px;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  background-image: none;
  text-decoration: none;
  transition: color var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}
.menu-panel a:hover {
  background: color-mix(in oklab, currentColor 10%, transparent);
  color: var(--fg);
}
html[data-theme="dark"] .menu-panel a:hover { color: var(--neon-ice); }

.theme-toggle {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--fg-muted);
  cursor: pointer;
  margin-left: 8px;
  padding: 0;
  transition: color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.theme-toggle:hover { color: var(--fg); border-color: var(--accent); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

@media (max-width: 600px) {
  .nav-link { display: none; }
  .menu-toggle { display: inline-flex; }
}

@keyframes entry {
  0% { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 32px;
  display: flex;
  align-items: center;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-subtle);
  flex-wrap: wrap;
}
footer .spacer { flex: 1; }
footer a { color: var(--fg-muted); background-image: none; }
footer a:hover { color: var(--fg); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin: 0 0 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}