html { scroll-behavior: smooth; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f8f9ff; }
::-webkit-scrollbar-thumb { background: #c7c4d8; border-radius: 4px; }
.feature-tab[aria-selected="true"] { background: #eef2ff; border-color: #c7d2fe; }
.feature-tab:hover { background: #f8f9ff; }
.feature-tab:focus-visible { outline: 2px solid #4f46e5; outline-offset: 2px; }
#theme-toggle:focus-visible { outline: 2px solid #4f46e5; outline-offset: 3px; }

html.dark body { background: #131313 !important; color: #f8fafc; }
html.dark .hero-glow { display: none; }
html.dark header,
html.dark footer,
html.dark .preview-frame,
html.dark .feature-card { background-color: #0f0f0f !important; }
html.dark header { border-color: #131313; }
html.dark header a span { color: #f8fafc; }
html.dark header a[href*="releases"] { background: #18181b; border-color: #3f3f46; color: #c4b5fd; }
html.dark header a[href*="releases"]:hover { background: #27272a; }
html.dark #theme-toggle { color: #e4e4e7; }
html.dark #theme-toggle:hover { background: #27272a; }
html.dark main h1,
html.dark main section h2,
html.dark main section h3,
html.dark .feature-tab { color: #f8fafc !important; }
html.dark main p,
html.dark footer { color: #a1a1aa; }
html.dark .preview-frame,
html.dark .feature-card { border-color: #27272a !important; box-shadow: none !important; }
html.dark .feature-tab { background: #18181b; border-color: #3f3f46; }
html.dark .feature-tab[aria-selected="true"] { background: #27272a; border-color: #6366f1; }
html.dark .feature-tab:hover { background: #27272a; }
html.dark .feature-preview-frame { background: #18181b !important; border-color: #3f3f46 !important; }
html.dark .quick-specs { color: #d4d4d8; }
html.dark ::-webkit-scrollbar-track { background: #0f0f0f; }
html.dark ::-webkit-scrollbar-thumb { background: #52525b; }

.site-loader {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    background: #f8f9ff;
    color: #0b1c30;
    opacity: 1;
    transition: opacity 450ms ease, visibility 450ms ease;
}
html.dark .site-loader { background: #131313; color: #f8fafc; }
.site-loader[aria-hidden="true"] { visibility: hidden; }
body.is-ready #site-loader { opacity: 0; pointer-events: none; }
.site-loader p { margin: 0; font-size: 0.875rem; font-weight: 600; letter-spacing: 0.02em; }
.site-loader.has-error { padding: 24px; text-align: center; }
.site-loader.has-error .loader-mark { display: none; }
#loader-retry {
    border: 1px solid #c7d2fe;
    border-radius: 999px;
    padding: 9px 18px;
    color: #4f46e5;
    font-weight: 600;
    transition: background-color 180ms ease, transform 180ms ease;
}
#loader-retry:hover { background: #eef2ff; transform: translateY(-1px); }
.loader-mark { display: flex; align-items: center; gap: 6px; height: 28px; }
.loader-mark span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #6366f1;
    animation: loader-pulse 900ms ease-in-out infinite;
}
.loader-mark span:nth-child(2) { animation-delay: 120ms; }
.loader-mark span:nth-child(3) { animation-delay: 240ms; }
@keyframes loader-pulse {
    0%, 60%, 100% { opacity: 0.38; transform: translateY(0) scale(0.8); }
    30% { opacity: 1; transform: translateY(-5px) scale(1); }
}
[data-reveal] {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 650ms cubic-bezier(0.2, 0.7, 0.2, 1), transform 650ms cubic-bezier(0.2, 0.7, 0.2, 1);
    transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal="header"] { transform: translateY(-14px); }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }
.feature-tab { transition: background-color 220ms ease, border-color 220ms ease, transform 220ms ease, color 220ms ease; }
.feature-tab:hover { transform: translateX(3px); }
#download-button { transition: transform 220ms ease, filter 220ms ease; }
#download-button:hover { filter: brightness(1.08); }
[data-feature-image] { transition: opacity 240ms ease, transform 500ms cubic-bezier(0.2, 0.7, 0.2, 1); }
[data-feature-image].image-loading { opacity: 0.55; }
.content-switch { animation: content-enter 350ms cubic-bezier(0.2, 0.7, 0.2, 1); }
@keyframes content-enter {
    from { opacity: 0.45; transform: translateY(7px); }
    to { opacity: 1; transform: translateY(0); }
}
::view-transition-old(root),
::view-transition-new(root) { animation-duration: 180ms; animation-timing-function: ease-in-out; }
::view-transition-old(root) { animation-name: theme-fade-out; }
::view-transition-new(root) { animation-name: theme-fade-in; }
@keyframes theme-fade-out { to { opacity: 0; } }
@keyframes theme-fade-in { from { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
    ::view-transition-old(root),
    ::view-transition-new(root) { animation-duration: 0.01ms; }
    [data-reveal] { opacity: 1; transform: none; }
}