/* Page shell: header, sidebar, content column, on-page TOC. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-padding-top: calc(var(--deja-header-h) + 1rem);
}

body {
  margin: 0;
  font-family: var(--deja-font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--deja-ink);
  background: var(--deja-surface);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1 {
  outline: none;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--deja-primary);
  color: var(--deja-primary-contrast);
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--deja-radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

/* ---- Boot splash ---- */

.boot-splash {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: var(--deja-surface);
}

.boot-splash-mark {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--deja-primary);
  animation: boot-pulse 1.4s ease-in-out infinite;
}

.boot-splash-mark img {
  width: 3rem;
  height: 3rem;
  border-radius: 0.7rem;
}

.boot-splash-hint {
  color: var(--deja-muted);
  font-size: 0.9rem;
}

@keyframes boot-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.45;
  }
}

/* ---- Header ---- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--deja-header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1rem;
  background: color-mix(in srgb, var(--deja-surface) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--deja-border);
  z-index: 100;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--deja-ink);
  text-decoration: none;
}

.site-logo img {
  width: 1.6rem;
  height: 1.6rem;
  display: block;
}

.site-logo .version-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--deja-muted);
  border: 1px solid var(--deja-border);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
}

.header-spacer {
  flex: 1;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.header-links a,
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  height: 2.1rem;
  min-width: 2.1rem;
  padding: 0 0.6rem;
  border: none;
  border-radius: var(--deja-radius-sm);
  background: transparent;
  color: var(--deja-muted);
  font: inherit;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
}

.header-links a:hover,
.icon-button:hover {
  background: var(--deja-primary-soft);
  color: var(--deja-primary);
}

.icon-button svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

.lang-toggle {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ---- Docs grid ---- */

.docs-shell {
  display: grid;
  grid-template-columns: var(--deja-sidebar-w) minmax(0, 1fr) var(--deja-toc-w);
  max-width: 90rem;
  margin: 0 auto;
  padding-top: var(--deja-header-h);
}

.docs-sidebar {
  position: sticky;
  top: var(--deja-header-h);
  height: calc(100vh - var(--deja-header-h));
  overflow-y: auto;
  padding: 1.25rem 0.75rem 3rem 1rem;
  border-right: 1px solid var(--deja-border);
}

.docs-main {
  padding: 2rem 3rem 5rem;
  min-width: 0;
}

.docs-article {
  max-width: var(--deja-content-max);
  margin: 0 auto;
}

.docs-toc {
  position: sticky;
  top: var(--deja-header-h);
  height: calc(100vh - var(--deja-header-h));
  overflow-y: auto;
  padding: 1.5rem 1rem 3rem 0;
  font-size: 0.85rem;
}

@media (max-width: 1180px) {
  .docs-shell {
    grid-template-columns: var(--deja-sidebar-w) minmax(0, 1fr);
  }

  .docs-toc {
    display: none;
  }
}

@media (max-width: 860px) {
  .docs-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .docs-sidebar {
    position: fixed;
    inset: var(--deja-header-h) auto 0 0;
    width: min(var(--deja-sidebar-w), 85vw);
    background: var(--deja-surface);
    border-right: 1px solid var(--deja-border);
    box-shadow: var(--deja-shadow-raised);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    z-index: 90;
  }

  .docs-sidebar.open {
    transform: translateX(0);
  }

  .docs-main {
    padding: 1.5rem 1.25rem 4rem;
  }
}

.sidebar-toggle {
  display: none;
}

@media (max-width: 860px) {
  .sidebar-toggle {
    display: inline-flex;
  }
}

/* ---- Typography ---- */

.docs-article h1 {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.docs-article .lead {
  font-size: 1.1rem;
  color: var(--deja-muted);
  margin: 0 0 2rem;
}

.docs-article h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
}

.docs-article h3 {
  font-size: 1.12rem;
  font-weight: 650;
  margin: 1.75rem 0 0.5rem;
}

.docs-article p {
  margin: 0.75rem 0;
}

.docs-article a {
  color: var(--deja-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.docs-article a:hover {
  border-bottom-color: currentColor;
}

.docs-article ul,
.docs-article ol {
  padding-left: 1.4rem;
  margin: 0.75rem 0;
}

.docs-article li {
  margin: 0.3rem 0;
}

.heading-anchor {
  margin-left: 0.4rem;
  opacity: 0;
  font-weight: 400;
  border-bottom: none !important;
}

h2:hover .heading-anchor,
h3:hover .heading-anchor,
h2:focus-within .heading-anchor,
h3:focus-within .heading-anchor {
  opacity: 0.6;
}

/* ---- Landing ---- */

.landing {
  padding-top: var(--deja-header-h);
}

.landing-hero {
  max-width: 68rem;
  margin: 0 auto;
  padding: 5rem 1.5rem 3.5rem;
  text-align: center;
}

.landing-hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 850;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin: 0 0 1rem;
}

.landing-hero h1 .accent {
  color: var(--deja-primary);
}

.landing-hero .tagline {
  font-size: 1.2rem;
  color: var(--deja-muted);
  max-width: 42rem;
  margin: 0 auto 2rem;
}

.landing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2.25rem;
}

.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}

.button-primary {
  background: var(--deja-primary);
  color: var(--deja-primary-contrast);
}

.button-primary:hover {
  background: var(--deja-primary-hover);
}

.button-secondary {
  border-color: var(--deja-border-strong);
  color: var(--deja-ink);
  background: var(--deja-elevated);
}

.button-secondary:hover {
  border-color: var(--deja-primary);
  color: var(--deja-primary);
}

.landing-install {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--deja-mono);
  font-size: 0.9rem;
  background: var(--deja-code-bg);
  border: 1px solid var(--deja-border);
  border-radius: var(--deja-radius);
  padding: 0.6rem 1rem;
  color: var(--deja-ink);
}

.landing-grid {
  max-width: 68rem;
  margin: 0 auto;
  padding: 1rem 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1rem;
}

.landing-card {
  background: var(--deja-elevated);
  border: 1px solid var(--deja-border);
  border-radius: var(--deja-radius);
  padding: 1.25rem 1.4rem;
  box-shadow: var(--deja-shadow);
}

.landing-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.landing-card p {
  margin: 0;
  color: var(--deja-muted);
  font-size: 0.92rem;
}

.landing-code {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  text-align: left;
}

.landing-footer {
  border-top: 1px solid var(--deja-border);
  color: var(--deja-muted);
  text-align: center;
  padding: 2rem 1rem 3rem;
  font-size: 0.9rem;
}