:root {
    --nav-bg: rgba(255, 255, 255, 0.85);
    --nav-solid: #ffffff;
    --nav-line: rgba(0, 0, 0, 0.08);
    --nav-fg: #4b5563;
    --nav-fg-strong: #111827;
    --nav-hover: rgba(0, 0, 0, 0.05);
    --nav-accent: #2563eb;
    --nav-box-bg: rgba(0, 0, 0, 0.04);
}

:root[data-theme="dark"] {
    --nav-bg: rgba(10, 10, 10, 0.85);
    --nav-solid: #0a0a0a;
    --nav-line: rgba(255, 255, 255, 0.08);
    --nav-fg: rgba(255, 255, 255, 0.72);
    --nav-fg-strong: #ffffff;
    --nav-hover: rgba(255, 255, 255, 0.08);
    --nav-accent: #60a5fa;
    --nav-box-bg: rgba(255, 255, 255, 0.06);
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--accent);
    color: var(--on-accent);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    z-index: 10000;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 1rem;
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.65rem clamp(1rem, 4vw, 3rem);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-line);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    backdrop-filter: saturate(180%) blur(12px);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 0.9rem;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

body.blog-page .site-nav {
    --nav-bg: color-mix(in srgb, var(--bg) 82%, transparent);
    --nav-line: var(--line);
    --nav-fg: var(--fg-muted);
    --nav-fg-strong: var(--fg);
    --nav-accent: var(--accent);
}

@supports not (background: color-mix(in srgb, red 50%, transparent)) {
    body.blog-page .site-nav { --nav-bg: var(--bg); }
}

.site-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: var(--nav-fg-strong);
    flex: none;
}

.site-nav__mark {
    display: inline-flex;
    width: 1.75rem;
    height: 1.75rem;
    color: var(--nav-accent);
    transition: transform 0.25s ease, color 0.25s ease;
}

.site-nav__mark svg {
    width: 100%;
    height: 100%;

    vector-effect: non-scaling-stroke;
}

.site-nav__wordmark {
    font-weight: 700;

    opacity: 0.92;
}

.site-nav__brand:hover .site-nav__mark {
    transform: rotate(-4deg) scale(1.06);
    color: var(--accent-hover, var(--nav-accent));
}

@media (prefers-reduced-motion: reduce) {
    .site-nav__mark,
    .site-nav__brand:hover .site-nav__mark { transition: none; transform: none; }
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
    flex-wrap: nowrap;
}

.site-nav__links a {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    border-radius: 7px;
    text-decoration: none;
    color: var(--nav-fg);
    white-space: nowrap;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav__links a:hover {
    color: var(--nav-fg-strong);
    background: var(--nav-hover);
}

body.blog-page .site-nav__links a:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.site-nav__links a[aria-current="page"] {
    color: var(--nav-accent);
    font-weight: 600;
    background: var(--nav-hover);
}

.site-nav__end {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex: none;
}

.nav-offline-badge {
    display: none;
    align-items: center;
    gap: 0.45rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: var(--danger);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    user-select: none;
    line-height: 1.2;
    transition: all 0.2s ease;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

:root[data-theme="dark"] .nav-offline-badge {
    background: rgba(239, 68, 68, 0.25);
    border-color: rgba(239, 68, 68, 0.55);
    color: #f87171;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.35);
}

.nav-offline-badge.is-offline {
    display: inline-flex !important;
}

.nav-offline-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #ef4444;
    box-shadow: 0 0 6px #ef4444;
    animation: navPulseDot 1.4s infinite;
    flex-shrink: 0;
}

:root[data-theme="dark"] .nav-offline-dot {
    background: #f87171;
    box-shadow: 0 0 8px #f87171;
}

@keyframes navPulseDot {
    0% { transform: scale(0.9); opacity: 0.7; box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
    70% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    100% { transform: scale(0.9); opacity: 0.7; box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.lang-selector {
    display: inline-flex;
    align-items: center;
    gap: 0.15rem;
    padding: 2px;
    border-radius: 8px;
    background: var(--nav-box-bg);
    border: 1px solid var(--nav-line);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--nav-fg);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease, opacity 0.15s ease;
    font-family: inherit;
    letter-spacing: 0.02em;
    line-height: 1.2;
}

.lang-btn:hover:not(:disabled) {
    color: var(--nav-fg-strong);
    background: var(--nav-hover);
}

.lang-btn.active {
    background: var(--nav-accent);
    color: var(--on-accent) !important;
}

.lang-btn.is-unavailable,
.lang-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    text-decoration: line-through;
    text-decoration-color: currentColor;
    pointer-events: auto;
}

.lang-btn.is-unavailable:hover,
.lang-btn:disabled:hover {
    background: transparent;
    color: var(--nav-fg);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border-radius: 7px;
    border: 1px solid var(--nav-line);
    background: var(--nav-box-bg);
    color: var(--nav-fg-strong);
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
    line-height: 1;
}

.theme-toggle:hover {
    background: var(--nav-hover);
    border-color: var(--nav-accent);
    transform: scale(1.05);
}

body.blog-page .lang-selector {
    background: var(--bg-soft);
    border-color: var(--line);
}

body.blog-page .lang-btn {
    color: var(--fg-muted);
}

body.blog-page .lang-btn:hover:not(:disabled) {
    color: var(--fg);
    background: var(--accent-soft);
}

body.blog-page .lang-btn.active {
    background: var(--accent);
    color: var(--on-accent) !important;
}

body.blog-page .theme-toggle {
    background: var(--bg-soft);
    border-color: var(--line);
    color: var(--fg);
}

body.blog-page .theme-toggle:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
}

.site-nav__cta {
    padding: 0.4rem 0.9rem;
    border-radius: 7px;
    text-decoration: none;
    font-weight: 600;
    background: var(--nav-accent, #60a5fa);
    color: var(--on-accent);
    white-space: nowrap;
}

.site-nav__cta:hover { filter: brightness(1.08); }

.site-nav__toggle {
    display: none;
    padding: 0.35rem 0.6rem;
    font-size: 1.1rem;
    line-height: 1;
    color: inherit;
    background: none;
    border: 1px solid var(--nav-line, rgba(255, 255, 255, 0.15));
    border-radius: 7px;
    cursor: pointer;
}

@media (max-width: 860px) {
    .site-nav { gap: 0.5rem; padding: 0.5rem clamp(0.75rem, 3vw, 1.5rem); }

    .site-nav__toggle { display: block; margin-left: 0.25rem; }

    .site-nav__links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.5rem;
        background: var(--nav-solid, #0a0a0a);
        border-bottom: 1px solid var(--nav-line, rgba(255, 255, 255, 0.08));
    }

    body.blog-page .site-nav__links { background: var(--bg); }

    .site-nav.is-open .site-nav__links { display: flex; }

    .site-nav__links a { padding: 0.7rem 0.85rem; }

    .site-nav__end { margin-left: auto; gap: 0.35rem; }

    .site-nav__cta { display: none; }
}

@media (max-width: 480px) {
    .site-nav__brand { font-size: 0.82rem; gap: 0.35rem; }

    .site-nav__mark { width: 1.55rem; height: 1.55rem; }
    .lang-btn { padding: 0.2rem 0.35rem; font-size: 0.7rem; }
    .theme-toggle { width: 1.75rem; height: 1.75rem; font-size: 0.85rem; }
}

body.blog-page .blog-header,
body.blog-page .post-container,
body.blog-page .idx-wrap {
    padding-top: 1.25rem;
}

body.blog-page .site-nav__cta { color: var(--on-accent, #fff); }
body.blog-page .site-nav__brand { color: var(--fg); }

body.blog-page .site-nav__mark { color: var(--nav-accent); }
body.blog-page .site-nav__links a { color: var(--fg-muted); }
body.blog-page .site-nav__links a[aria-current="page"] { color: var(--accent); }

.site-nav--auto {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s ease, opacity 0.28s ease;
}

.site-nav--auto.is-visible {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.no-js .site-nav--auto {
    position: sticky;
    transform: none;
    opacity: 1;
    pointer-events: auto;
}

body:not(.blog-page) .hero {
    padding-top: calc(2rem + 3.75rem);
}

@media (max-width: 768px) {
    body:not(.blog-page) .hero {
        padding-top: calc(1.5rem + 3.5rem);
    }
}

html {
    scroll-padding-top: 4.5rem;
}