/* ── Shared site layout + navigation ───────────────────────────────────── */
/* Used by React pages AND the Astro blog (loaded as a static asset).       */

/* Page shell */
.site-layout {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.site-layout__header {
  display: flex;
  align-items: center;
  padding: 0.65rem 1.25rem;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  gap: 0.75rem;
  flex-shrink: 0;
}

.site-layout__header-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

/* ── Logo: continuous Chaturanga ↔ Shatranj crossfade ─────────────────────
   Four images stacked. Two keyframe animations alternate brand visibility.
   Theme selects which colour pair (light/dark) participates — the other pair
   is frozen at opacity:0 with animation:none.
──────────────────────────────────────────────────────────────────────────── */

@keyframes logo-brand-a {
  0%,  41.7% { opacity: 1; }
  50%, 91.7% { opacity: 0; }
  100%        { opacity: 1; }
}
@keyframes logo-brand-b {
  0%,  41.7% { opacity: 0; }
  50%, 91.7% { opacity: 1; }
  100%        { opacity: 0; }
}

.site-layout__logo-wrap {
  position: relative;
  height: 32px;
  width: calc(32px * 811 / 308);
  flex-shrink: 0;
}

.site-layout__logo {
  position: absolute;
  inset: 0;
  height: 100%;
  width: 100%;
  object-fit: contain;
  object-position: left center;
  opacity: 0;
  animation: none;
}

/* Default (dark system preference) */
.site-layout__logo--chaturanga.site-layout__logo--dark { animation: logo-brand-a 12s ease-in-out infinite; }
.site-layout__logo--shatranj.site-layout__logo--dark   { animation: logo-brand-b 12s ease-in-out infinite; }

/* System light */
@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) .site-layout__logo--chaturanga.site-layout__logo--light { animation: logo-brand-a 12s ease-in-out infinite; }
  :root:not([data-theme='dark']) .site-layout__logo--shatranj.site-layout__logo--light   { animation: logo-brand-b 12s ease-in-out infinite; }
  :root:not([data-theme='dark']) .site-layout__logo--dark { animation: none; opacity: 0; }
}

/* Explicit light */
[data-theme='light'] .site-layout__logo--chaturanga.site-layout__logo--light { animation: logo-brand-a 12s ease-in-out infinite; }
[data-theme='light'] .site-layout__logo--shatranj.site-layout__logo--light   { animation: logo-brand-b 12s ease-in-out infinite; }
[data-theme='light'] .site-layout__logo--dark { animation: none; opacity: 0; }

/* Explicit dark */
[data-theme='dark'] .site-layout__logo--light { animation: none; opacity: 0; }

/* Auth section — pushed to far right */
.site-layout__auth {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-layout__user {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-secondary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-layout__oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  cursor: pointer;
  font-size: 14px;
  padding: 0;
  color: var(--color-primary);
  transition: background-color 0.15s;
  flex-shrink: 0;
}

.site-layout__oauth-btn:hover {
  background: var(--color-tertiary-hover);
}

/* Theme toggle button */
.site-layout__theme-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-secondary);
  cursor: pointer;
  padding: 0.35rem 0.6rem;
  font-size: 1rem;
  line-height: 1;
  transition: color 0.15s, border-color 0.15s;
}

.site-layout__theme-btn:hover {
  color: var(--color-gold, #d4a853);
  border-color: var(--color-gold, #d4a853);
}

/* Body = sidebar + main */
.site-layout__body {
  display: flex;
  flex-direction: row;
  min-height: 0;
  flex: 1;
}

.site-layout__main {
  flex: 1;
  min-width: 0;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Sidebar ─────────────────────────────────────────────────────────── */

.site-nav__sidebar {
  width: 200px;
  flex-shrink: 0;
  padding: 12px 8px;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--color-bg);
  position: sticky;
  top: 0;
  height: 100dvh;
  overflow-y: auto;
}

/* Nav items (works for both <a> and <button>) */
.site-nav__item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: none;
  color: var(--color-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
  position: relative;
}

.site-nav__item:hover:not(:disabled) {
  background: var(--color-tertiary-hover, rgba(255,255,255,0.06));
  color: var(--color-primary);
}

.site-nav__item--active {
  background: var(--color-tertiary);
  color: var(--color-primary);
  font-weight: 700;
}

/* Left-edge accent bar on active item */
.site-nav__item--active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 25%;
  bottom: 25%;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--color-primary);
}

.site-nav__item:disabled {
  opacity: 0.4;
  cursor: default;
}

.site-nav__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.site-nav__divider {
  height: 1px;
  background: var(--color-border);
  margin: 6px 8px;
}

.site-nav__spacer {
  flex: 1;
}

/* X / Twitter link at bottom of sidebar */
.site-nav__x-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--color-secondary);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.site-nav__x-link:hover {
  background: var(--color-tertiary);
  color: var(--color-primary);
}

/* ── Mobile hamburger button (only visible below 768px) ─────────────── */

.site-layout__hamburger {
  display: none;
  position: relative;
}

.site-layout__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  transition: color 0.15s, border-color 0.15s;
}

.site-layout__menu-btn:hover,
.site-layout__menu-btn--open {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.site-layout__menu-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 200;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 80dvh;
  overflow-y: auto;
}

/* The Astro blog uses hidden attribute to toggle the panel.
   CSS display: flex overrides it without this rule. */
.site-layout__menu-panel[hidden] {
  display: none;
}

/* ── Nav group (Community Games etc.) ───────────────────────────────────── */

.site-nav__nav-group {
  display: flex;
  flex-direction: column;
}

.site-nav__group-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-secondary);
  opacity: 0.6;
  user-select: none;
}

.site-nav__subitem {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 30px;
  border-radius: 8px;
  color: var(--color-secondary);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
  position: relative;
}

.site-nav__subitem:not(.site-nav__subitem--disabled):hover {
  background: var(--color-tertiary-hover, rgba(255,255,255,0.06));
  color: var(--color-primary);
}

.site-nav__subitem--disabled {
  opacity: 0.3;
  cursor: default;
  filter: blur(1.5px);
  pointer-events: none;
  user-select: none;
}

/* ── Mobile: hide sidebar, show hamburger ────────────────────────────── */

@media (max-width: 768px) {
  .site-nav__sidebar {
    display: none;
  }

  .site-layout__hamburger {
    display: block;
  }
}