/* Shared header shell */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--bg-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--fg-muted);
    cursor: pointer;
    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease,
        color 0.25s ease,
        transform 0.18s ease;
}

.theme-toggle:hover {
    border-color: var(--accent-20);
    background: var(--bg-overlay-strong);
    box-shadow: 0 0 20px var(--accent-08);
    color: var(--fg);
}

.theme-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.theme-toggle-icon {
    width: 14px;
    height: 14px;
    opacity: 0.65;
    transition: opacity 0.25s ease, color 0.25s ease;
}

.theme-toggle-track {
    position: relative;
    width: 32px;
    height: 18px;
    border-radius: 999px;
    background: var(--bg-hover);
    border: 1px solid var(--border-strong);
    flex-shrink: 0;
}

.theme-toggle-thumb {
    position: absolute;
    top: 1px;
    left: 1px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-20);
    transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

html[data-theme="dark"] .theme-toggle-thumb {
    transform: translateX(14px);
}

html[data-theme="light"] .theme-toggle-icon--sun,
html[data-theme="dark"] .theme-toggle-icon--moon {
    color: var(--accent);
    opacity: 1;
}

.navbar-theme-toggle {
    display: none;
}

.overlay-theme-toggle {
    position: fixed;
    bottom: 32px;
    left: 32px;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease 0.2s;
}

.fullscreen-nav-overlay.open ~ .overlay-theme-toggle {
    opacity: 1;
    pointer-events: all;
}

.fullscreen-menu-btn {
    position: fixed;
    top: 18px;
    right: 16px;
    z-index: 2000;
    background: var(--bg-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 2px solid var(--accent);
    border-radius: 999px;
    cursor: pointer;
    height: 42px;
    padding: 0 16px 0 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background 0.25s ease, box-shadow 0.25s ease;
}

.fullscreen-menu-btn:hover {
    background: var(--accent-08);
    box-shadow: 0 0 24px var(--accent-20);
}

.menu-label {
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    color: var(--accent);
    min-width: 38px;
    text-align: left;
    font-family: 'Inter', sans-serif;
}

.menu-bars {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.menu-bars span {
    display: block;
    height: 1.5px;
    background: var(--accent);
    border-radius: 2px;
    transform-origin: left center;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease, width 0.3s ease;
}

.menu-bars span:nth-child(1) {
    width: 18px;
}

.menu-bars span:nth-child(2) {
    width: 12px;
}

.menu-bars span:nth-child(3) {
    width: 18px;
}

.fullscreen-menu-btn.active .menu-bars span:nth-child(1) {
    transform: rotate(45deg) translate(1px, -1px);
    width: 18px;
}

.fullscreen-menu-btn.active .menu-bars span:nth-child(2) {
    opacity: 0;
    width: 0;
}

.fullscreen-menu-btn.active .menu-bars span:nth-child(3) {
    transform: rotate(-45deg) translate(1px, 1px);
    width: 18px;
}

.fullscreen-nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 1500;
    background: var(--bg-overlay-max);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.fullscreen-nav-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.fullscreen-nav-overlay nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.fullscreen-nav-overlay nav > a,
.fullscreen-nav-overlay nav > .overlay-nav-group {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.fullscreen-nav-overlay nav > a {
    font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    font-weight: 700;
    color: var(--fg);
    letter-spacing: -0.02em;
    padding: 8px 0;
    transition: color 0.25s ease, opacity 0.4s ease, transform 0.4s ease;
}

.fullscreen-nav-overlay.open nav > a,
.fullscreen-nav-overlay.open nav > .overlay-nav-group {
    opacity: 1;
    transform: translateY(0);
}

.fullscreen-nav-overlay.open nav > *:nth-child(1) { transition-delay: 0.04s; }
.fullscreen-nav-overlay.open nav > *:nth-child(2) { transition-delay: 0.09s; }
.fullscreen-nav-overlay.open nav > *:nth-child(3) { transition-delay: 0.14s; }
.fullscreen-nav-overlay.open nav > *:nth-child(4) { transition-delay: 0.19s; }
.fullscreen-nav-overlay.open nav > *:nth-child(5) { transition-delay: 0.24s; }
.fullscreen-nav-overlay.open nav > *:nth-child(6) { transition-delay: 0.29s; }
.fullscreen-nav-overlay.open nav > *:nth-child(7) { transition-delay: 0.34s; }
.fullscreen-nav-overlay.open nav > *:nth-child(8) { transition-delay: 0.39s; }

.fullscreen-nav-overlay nav > a:hover {
    color: var(--accent);
}

.overlay-nav-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.overlay-nav-group-label {
    font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    font-weight: 700;
    color: var(--fg);
    letter-spacing: -0.02em;
    padding: 8px 0 4px;
    transition: color 0.25s ease;
    opacity: 1 !important;
    transform: none !important;
}

.overlay-nav-group-label:hover {
    color: var(--accent);
}

.overlay-nav-subnav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 16px;
    padding: 2px 0 6px;
    max-width: 380px;
}

.overlay-nav-subnav a {
    font-size: clamp(0.72rem, 1.6vw, 0.85rem);
    font-weight: 500;
    color: var(--fg-soft);
    letter-spacing: 0.03em;
    padding: 2px 0;
    transition: color 0.2s ease;
    white-space: nowrap;
}

.overlay-nav-subnav a:hover {
    color: var(--accent);
}

.fullscreen-nav-overlay nav a.overlay-nav-cta {
    background: var(--accent);
    color: var(--accent-ink);
    padding: 10px 28px;
    border-radius: 999px;
    font-size: clamp(0.9rem, 1.8vw, 1.1rem);
    font-weight: 700;
    letter-spacing: 0.01em;
    margin-bottom: 12px;
    -webkit-text-fill-color: var(--accent-ink);
}

.fullscreen-nav-overlay nav a.overlay-nav-cta:hover {
    background: var(--fg);
    color: var(--bg);
    -webkit-text-fill-color: var(--bg);
}

.overlay-lang-switcher {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 2000;
    display: flex;
    gap: 4px;
    background: var(--border-strong);
    padding: 4px;
    border-radius: 8px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease 0.2s;
}

.fullscreen-nav-overlay.open ~ .overlay-lang-switcher {
    opacity: 1;
    pointer-events: all;
}

@media (max-width: 480px) {
    .navbar,
    .fullscreen-menu-btn {
        top: 16px;
        right: 12px;
    }

    .home-pill {
        top: 16px;
        left: 12px;
    }

    .overlay-theme-toggle {
        left: 12px;
        bottom: 18px;
    }

    .overlay-lang-switcher {
        right: 12px;
        bottom: 18px;
    }
}

@media (min-width: 1024px) {
    .navbar-theme-toggle {
        display: inline-flex;
    }

    .overlay-theme-toggle {
        display: none;
    }
}