.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:var(--z-sticky);padding:var(--space-1) calc(var(--space-2) + var(--safe-right-inset)) calc(var(--space-1) + var(--safe-bottom-inset)) calc(var(--space-2) + var(--safe-left-inset));background:color-mix(in srgb,var(--color-surface) 90%,transparent);border-top:1px solid color-mix(in srgb,var(--color-border) 80%,transparent);box-shadow:0 -1px 0 color-mix(in srgb,var(--color-ink) 3%,transparent),0 -8px 24px color-mix(in srgb,var(--color-ink) 5%,transparent);backdrop-filter:blur(16px) saturate(1.2);-webkit-backdrop-filter:blur(16px) saturate(1.2)}.bottom-nav-list{list-style:none;margin:0 auto;padding:0;max-width:var(--max-width);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-1)}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.12rem;min-height:var(--touch-comfort);padding:var(--space-1) .1rem;text-decoration:none;color:var(--color-muted);border-radius:var(--radius-button);-webkit-tap-highlight-color:transparent;transition:color var(--duration-fast) var(--ease-standard),transform var(--duration-fast) var(--ease-emphasized)}.bottom-nav-item:hover{color:var(--color-ink)}.bottom-nav-item:active{transform:scale(.96)}.bottom-nav-item:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.bottom-nav-item--active{color:var(--color-primary)}.bottom-nav-icon{position:relative;display:flex;align-items:center;justify-content:center;width:2.85rem;height:1.7rem}.bottom-nav-icon-well{position:absolute;inset:0;border-radius:var(--radius-badge);background:transparent;transition:background var(--duration-normal) var(--ease-emphasized),transform var(--duration-normal) var(--ease-emphasized)}.bottom-nav-item--active .bottom-nav-icon-well{background:var(--color-accent-light);transform:scaleX(1.02)}.bottom-nav-icon svg{position:relative;z-index:1;display:block}.bottom-nav-label{font-family:var(--font-ui);font-size:.625rem;font-weight:600;letter-spacing:.01em;line-height:var(--lh-label)}.bottom-nav-item--active .bottom-nav-label{font-weight:700}@media (prefers-reduced-motion:reduce){.bottom-nav-item--active .bottom-nav-icon-well,.bottom-nav-item:active{transform:none}}@media (min-width:48rem){.bottom-nav{display:none}}.has-bottom-nav{--bottom-nav-height:3.5rem;padding-bottom:calc(var(--bottom-nav-height) + var(--space-4) + var(--safe-bottom-inset))}@media (min-width:48rem){.has-bottom-nav{padding-bottom:var(--page-pad-y)}}.lang-switch{display:inline-flex;align-items:center;gap:.15rem;padding:.15rem;border-radius:999px;border:1px solid var(--color-border);background:var(--color-surface)}.lang-switch-btn{min-width:2.1rem;min-height:1.85rem;padding:0 .4rem;border:none;border-radius:999px;background:transparent;color:var(--color-muted);font-family:var(--font-mono);font-size:.68rem;font-weight:650;letter-spacing:.04em;cursor:pointer}.lang-switch-btn--active{background:color-mix(in srgb,var(--color-primary) 14%,var(--color-surface));color:var(--color-primary)}.lang-switch-btn:hover{color:var(--color-ink)}.lang-switch-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.theme-toggle{gap:.15rem;padding:.2rem;border-radius:var(--radius-badge);background:var(--color-surface);border:1px solid var(--color-border)}.theme-toggle,.theme-toggle-btn{display:inline-flex;align-items:center}.theme-toggle-btn{justify-content:center;min-width:var(--touch-min);min-height:var(--touch-min);padding:0;border:none;border-radius:var(--radius-badge);background:transparent;color:var(--color-muted);font-size:1rem;line-height:1;transition:background var(--duration-fast) var(--ease-standard),color var(--duration-fast) var(--ease-standard)}.theme-toggle-btn:hover{color:var(--color-ink);background:color-mix(in srgb,var(--color-ink) 6%,transparent)}.theme-toggle-btn:focus-visible{outline:2px solid var(--color-success);outline-offset:2px}.theme-toggle-btn[aria-pressed=true],.theme-toggle-btn[aria-pressed=true]:hover{background:var(--color-ink);color:var(--color-bg)}.theme-toggle-icon{display:block;width:1.1rem;height:1.1rem}.site-topbar{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);min-height:var(--touch-comfort);margin-bottom:var(--space-1)}.site-topbar--sticky{position:sticky;top:0;z-index:var(--z-sticky);margin:calc(-1 * (var(--page-pad-y) + var(--safe-top-inset))) calc(-1 * (var(--page-pad-x) + var(--safe-right-inset))) var(--space-2) calc(-1 * (var(--page-pad-x) + var(--safe-left-inset)));padding:calc(var(--space-2) + var(--safe-top-inset)) calc(var(--page-pad-x) + var(--safe-right-inset)) var(--space-2) calc(var(--page-pad-x) + var(--safe-left-inset));background:color-mix(in srgb,var(--color-bg) 88%,transparent);border-bottom:1px solid color-mix(in srgb,var(--color-border) 75%,transparent);box-shadow:0 1px 0 color-mix(in srgb,var(--color-ink) 3%,transparent);backdrop-filter:blur(14px) saturate(1.15);-webkit-backdrop-filter:blur(14px) saturate(1.15)}.site-topbar-brand{margin:0;font-family:var(--font-display);font-size:1.28rem;font-weight:650;letter-spacing:var(--tracking-card-title);text-transform:lowercase;color:var(--color-ink);text-decoration:none;line-height:1.15;min-height:var(--touch-min);display:inline-flex;align-items:center;gap:.45rem;transition:color var(--duration-fast) var(--ease-standard)}.site-topbar-brand-mark{display:block;width:2rem;height:2rem;flex-shrink:0}.site-topbar-brand-text{line-height:1.15}.site-topbar-brand:hover{color:var(--color-primary)}.site-topbar-brand:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px;border-radius:var(--radius-sm)}.site-topbar-actions{display:flex;align-items:center;gap:var(--space-2);flex-shrink:0}.site-topbar .theme-toggle{gap:0;padding:.12rem;background:color-mix(in srgb,var(--color-surface) 80%,var(--color-paper-deep));border-color:color-mix(in srgb,var(--color-border) 85%,transparent);box-shadow:var(--shadow-card)}.site-topbar .theme-toggle-btn{min-width:2.25rem;min-height:2.25rem}.site-topbar .theme-toggle-icon{width:1rem;height:1rem}