/* Source: Paper "Christian Selden — Resume Menu Studies" · Page 1 ·
   "03 — Margin Index · Portfolio hover open". Site code is authoritative. */
:root {
  --cs-nav-height: 4.625rem;
  --cs-nav-width: 52.5rem;
  --cs-nav-bg: #fbfaf7;
  --cs-nav-panel: #fff;
  --cs-nav-ink: #1a1a18;
  --cs-nav-muted: #6a6963;
  --cs-nav-faint: #96958e;
  --cs-nav-rule: #e6e4dd;
  --cs-nav-rule-strong: #d9d7d0;
  --cs-nav-hover: #ddeaf4;
  --cs-nav-hover-rule: #cad9e5;
  --cs-nav-shadow: 0 1.5rem 3.875rem rgba(25, 24, 21, 0.12);
  --cs-nav-ease: cubic-bezier(.22, 1, .36, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --cs-nav-bg: #141310;
    --cs-nav-panel: #1c1b17;
    --cs-nav-ink: #f1efe8;
    --cs-nav-muted: #a8a49b;
    --cs-nav-faint: #76736b;
    --cs-nav-rule: #2c2a23;
    --cs-nav-rule-strong: #3a372f;
    --cs-nav-hover: #26343e;
    --cs-nav-hover-rule: #344955;
    --cs-nav-shadow: 0 1.5rem 3.875rem rgba(0, 0, 0, 0.42);
  }
}

:root[data-theme="dark"] {
  --cs-nav-bg: #141310;
  --cs-nav-panel: #1c1b17;
  --cs-nav-ink: #f1efe8;
  --cs-nav-muted: #a8a49b;
  --cs-nav-faint: #76736b;
  --cs-nav-rule: #2c2a23;
  --cs-nav-rule-strong: #3a372f;
  --cs-nav-hover: #26343e;
  --cs-nav-hover-rule: #344955;
  --cs-nav-shadow: 0 1.5rem 3.875rem rgba(0, 0, 0, 0.42);
}

html.cs-nav-page {
  scroll-padding-top: calc(var(--cs-nav-height) + 1rem);
}

body.cs-nav-page {
  padding-top: calc(var(--cs-nav-height) + 1.5rem);
}

.cs-nav,
.cs-nav * {
  box-sizing: border-box;
}

.cs-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--cs-nav-height);
  color: var(--cs-nav-ink);
  background: color-mix(in srgb, var(--cs-nav-bg) 96%, transparent);
  border-bottom: 1px solid var(--cs-nav-rule);
  font-family: "Space Grotesk", Inter, Arial, sans-serif;
  font-size: 0.8125rem;
  -webkit-font-smoothing: antialiased;
  backdrop-filter: blur(16px) saturate(1.1);
  transition: color 300ms ease, background 300ms ease, border-color 300ms ease,
    opacity 220ms ease, transform 360ms var(--cs-nav-ease);
}

body.cs-nav-autohide-page {
  padding-top: 0;
}

.cs-nav-autohide-page.cs-nav-hidden .cs-nav {
  opacity: 0;
  pointer-events: none;
  transform: translateY(calc(-100% - 0.75rem));
}

.cs-nav-reveal {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 1001;
  min-width: 4.5rem;
  min-height: 2rem;
  padding: 0 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  color: var(--cs-nav-muted);
  background: color-mix(in srgb, var(--cs-nav-bg) 90%, transparent);
  border: 1px solid var(--cs-nav-rule);
  border-top: 0;
  border-radius: 0 0 0.75rem 0.75rem;
  box-shadow: 0 0.65rem 1.5rem rgba(25, 24, 21, 0.1);
  font-family: "Space Grotesk", Inter, Arial, sans-serif;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 0.5rem));
  transition: color 160ms ease, background 220ms ease, border-color 160ms ease,
    opacity 180ms ease, transform 360ms var(--cs-nav-ease);
}

.cs-nav-reveal svg {
  width: 0.75rem;
  height: 0.75rem;
}

.cs-nav-hidden .cs-nav-reveal {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.cs-nav-reveal:hover,
.cs-nav-reveal:focus-visible {
  color: var(--cs-nav-ink);
  border-color: var(--cs-nav-rule-strong);
  outline: none;
}

.cs-nav-inner {
  position: relative;
  width: min(var(--cs-nav-width), calc(100% - 2.5rem));
  height: 100%;
  margin: 0 auto;
}

.cs-nav-brand,
.cs-nav-actions {
  position: absolute;
  top: 0;
  height: 100%;
  display: flex;
  align-items: center;
}

.cs-nav-brand {
  left: 0;
  min-width: 2.75rem;
  color: var(--cs-nav-ink);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  transform-origin: left center;
  transition: opacity 420ms ease, transform 520ms var(--cs-nav-ease);
}

.cs-nav-brand-short {
  display: none;
}

.cs-nav-actions {
  left: 100%;
  gap: 1.35rem;
  transform: translateX(-100%);
  transition: left 560ms var(--cs-nav-ease), transform 560ms var(--cs-nav-ease);
}

.cs-nav[data-brand-reveal]:not(.cs-nav--brand-visible) .cs-nav-brand {
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.35rem) scale(0.96);
}

.cs-nav[data-brand-reveal]:not(.cs-nav--brand-visible) .cs-nav-actions {
  left: 50%;
  transform: translateX(-50%);
}

.cs-nav-link,
.cs-projects-trigger {
  min-height: 2.75rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--cs-nav-ink);
  background: none;
  border: 0;
  font: inherit;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: color 180ms ease, opacity 180ms ease;
}

.cs-nav-link:hover,
.cs-nav-link:focus-visible,
.cs-projects-trigger:hover,
.cs-projects-trigger:focus-visible,
.cs-nav-link[aria-current="page"],
.cs-projects-trigger[aria-current="page"] {
  color: var(--cs-nav-ink);
}

.cs-nav-link:not([aria-current="page"]),
.cs-projects-trigger:not([aria-current="page"]) {
  color: var(--cs-nav-muted);
}

.cs-projects {
  height: 100%;
  display: flex;
  align-items: center;
}

.cs-projects-trigger {
  font-weight: 600;
}

.cs-projects-chevron {
  width: 0.75rem;
  height: 0.75rem;
  transition: transform 220ms var(--cs-nav-ease);
}

.cs-nav[data-projects-open="true"] .cs-projects-chevron {
  transform: rotate(180deg);
}

.cs-project-panel {
  position: fixed;
  top: var(--cs-nav-height);
  right: auto;
  left: var(--cs-project-panel-left, 1.25rem);
  width: min(24.0625rem, calc(100vw - 2.5rem));
  color: var(--cs-nav-ink);
  background: var(--cs-nav-panel);
  border: 1px solid var(--cs-nav-rule-strong);
  border-top: 0;
  box-shadow: var(--cs-nav-shadow);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-0.5rem) scale(0.985);
  transform-origin: top left;
  transition: opacity 170ms ease, visibility 170ms ease, transform 260ms var(--cs-nav-ease), background 300ms ease;
}

.cs-nav[data-projects-open="true"] .cs-project-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.cs-project-panel-head {
  padding: 1.125rem 1.25rem;
  border-bottom: 1px solid var(--cs-nav-rule);
}

.cs-project-panel-kicker {
  display: block;
  color: var(--cs-nav-muted);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  line-height: 1.2;
  text-transform: uppercase;
}

.cs-project-panel-head p {
  margin: 0.4375rem 0 0;
  color: var(--cs-nav-ink);
  font-size: 0.8125rem;
  line-height: 1.25;
}

.cs-project-item {
  min-height: 5.75rem;
  padding: 0.9375rem 1.25rem;
  display: grid;
  grid-template-columns: 2.625rem minmax(0, 1fr) auto;
  align-items: start;
  color: var(--cs-nav-ink);
  border-bottom: 1px solid var(--cs-nav-rule);
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease;
}

.cs-project-item:last-child {
  border-bottom: 0;
}

.cs-project-item:hover,
.cs-project-item:focus-visible,
.cs-project-item[aria-current="page"] {
  background: var(--cs-nav-hover);
  border-color: var(--cs-nav-hover-rule);
  outline: none;
}

.cs-project-number {
  padding-top: 0.125rem;
  color: var(--cs-nav-faint);
  font-size: 0.6875rem;
  line-height: 1.25;
}

.cs-project-title {
  display: block;
  color: var(--cs-nav-ink);
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.cs-project-description {
  display: block;
  margin-top: 0.3125rem;
  color: var(--cs-nav-muted);
  font-size: 0.75rem;
  line-height: 1.35;
}

.cs-project-arrow {
  color: var(--cs-nav-ink);
  font-size: 1rem;
  line-height: 1.25;
  transition: transform 220ms var(--cs-nav-ease);
}

.cs-project-item--soon {
  cursor: default;
}

.cs-project-item--soon .cs-project-title,
.cs-project-item--soon .cs-project-description {
  color: var(--cs-nav-muted);
}

.cs-project-status {
  align-self: start;
  padding-top: 0.1875rem;
  color: var(--cs-nav-faint);
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  line-height: 1.25;
  text-transform: uppercase;
  white-space: nowrap;
}

.cs-project-item:not(.cs-project-item--soon):hover .cs-project-arrow,
.cs-project-item:focus-visible .cs-project-arrow {
  transform: translate(0.2rem, -0.1rem);
}

.cs-theme-toggle {
  width: 2.75rem;
  height: 2.75rem;
  flex: none;
  display: grid;
  place-items: center;
  color: var(--cs-nav-ink);
  background: var(--cs-nav-bg);
  border: 1px solid var(--cs-nav-rule);
  border-radius: 50%;
  cursor: pointer;
  transition: border-color 180ms ease, background 300ms ease, transform 240ms var(--cs-nav-ease);
}

.cs-theme-toggle:hover {
  border-color: var(--cs-nav-ink);
  transform: rotate(8deg);
}

.cs-theme-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
}

.cs-theme-toggle .cs-moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .cs-theme-toggle .cs-sun { display: none; }
  :root:not([data-theme="light"]) .cs-theme-toggle .cs-moon { display: block; }
}

:root[data-theme="dark"] .cs-theme-toggle .cs-sun { display: none; }
:root[data-theme="dark"] .cs-theme-toggle .cs-moon { display: block; }
:root[data-theme="light"] .cs-theme-toggle .cs-sun { display: block; }
:root[data-theme="light"] .cs-theme-toggle .cs-moon { display: none; }

.cs-nav a:focus-visible,
.cs-nav button:focus-visible {
  outline: 0.125rem solid currentColor;
  outline-offset: 0.1875rem;
}

@media (max-width: 44rem) {
  .cs-nav-inner {
    width: calc(100% - 2rem);
  }

  .cs-nav-brand-full,
  .cs-photo-full {
    display: none;
  }

  .cs-nav-brand-short,
  .cs-photo-short {
    display: inline;
  }

  .cs-nav-actions {
    gap: clamp(0.45rem, 2.2vw, 0.75rem);
    font-size: clamp(0.7rem, 3.1vw, 0.78rem);
  }

  .cs-project-panel {
    right: 0.75rem;
    left: 0.75rem;
    width: auto;
    transform-origin: top center;
  }

  .cs-nav-reveal {
    min-width: 4.75rem;
    min-height: 2.75rem;
  }
}

@media (min-width: 44.01rem) {
  .cs-photo-short {
    display: none;
  }
}

@media (max-width: 23.5rem) {
  .cs-nav-inner { width: calc(100% - 1.25rem); }
  .cs-nav-actions { gap: 0.35rem; font-size: 0.68rem; }
  .cs-theme-toggle { width: 2.5rem; height: 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .cs-nav,
  .cs-nav *,
  .cs-nav *::before,
  .cs-nav *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .cs-nav-reveal {
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .cs-nav { display: none !important; }
  body.cs-nav-page { padding-top: 0 !important; }
}