.site-header {
    background: rgba(255, 255, 255, .9);
    border-bottom: 1px solid #e5e7eb;
    backdrop-filter: blur(8px);
}

.header-container {
    max-width: 1280px;
    margin: auto;
    padding: 2px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo img {
    width: 192px;
    height: 192px;
    object-fit: contain;
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.desktop-nav a,
.mobile-nav a {
    color: inherit;
    text-decoration: none;
}

.desktop-nav a:hover,
.desktop-nav a.active,
.mobile-nav a.active {
    color: #2563eb;
}

.donate-button {
    display: inline-block;
    background: #2563eb;
    color: white !important;
    padding: 10px 16px;
    border-radius: 8px;
}

.header-actions {
    display: flex;
    gap: 16px;
}

.header-actions button {
    background: transparent;
    border: 0;
    padding: 8px;
    cursor: pointer;
    font-size: 22px;
    color: inherit;
}

#mobile-menu-toggle {
    display: none;
}

.mobile-nav {
    padding: 16px;
    border-top: 1px solid #e5e7eb;
}

.mobile-nav:not([hidden]) {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-nav[hidden] {
    display: none;
}

html.dark .site-header,
html.dark .mobile-nav {
    background: #111827;
    color: #f9fafb;
    border-color: #1f2937;
}

@media (max-width: 767px) {
    .desktop-nav {
        display: none;
    }

    #mobile-menu-toggle {
        display: block;
    }

    .header-logo img {
        width: 144px;
        height: 144px;
    }
}

/* Wspólny wygląd menu na wszystkich podstronach */
.site-header,
.site-header nav,
.site-header nav a {
    font-family: Arial, sans-serif;
}

.site-header nav a {
    font-size: 15px;
    font-weight: 500;
    line-height: 1.5;
    text-decoration: none;
    color: #ffffff;
}

.site-header nav a:hover,
.site-header nav a.active {
    color: #2563eb;
}

/* Usuń domyślne marginesy przeglądarki */
html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Menu – tryb jasny */
html:not(.dark):not([data-theme="dark"]) header nav a {
    color: #111827;
}

/* Menu – tryb ciemny */
html.dark header nav a,
html[data-theme="dark"] header nav a {
    color: #ffffff;
}

/* Aktywna podstrona */
header nav a.active,
header nav a[aria-current="page"] {
    color: #2563eb !important;
}

/* Przycisk Wspomóż */
header nav a[href="/wspomoz"] {
    color: #ffffff !important;
}

/* Animacja otwierania menu mobilnego */
.mobile-nav:not([hidden]) {
    animation: mobileMenuOpen 0.3s ease-out;
    transform-origin: top;
}

@keyframes mobileMenuOpen {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .mobile-nav:not([hidden]) {
        animation: none;
    }
}
/* Animacje headera jak w React */
.desktop-nav a,
.mobile-nav a {
    transition: color 150ms ease-in-out;
}

/* Animacja przycisku Wspomóż */
.donate-button,
header nav a[href="/wspomoz"] {
    transition: background-color 150ms ease-in-out;
}

.donate-button:hover,
header nav a[href="/wspomoz"]:hover {
    background-color: #1d4ed8;
}

/* Animacja przycisku zmiany motywu */
.header-actions button {
    border-radius: 8px;
    transition: background-color 150ms ease-in-out;
}

.header-actions button:hover {
    background-color: #f3f4f6;
}

html.dark .header-actions button:hover {
    background-color: #1f2937;
}

/* Animacja logo */
.header-logo img {
    transition: all 300ms ease-in-out;
}

@media (prefers-reduced-motion: reduce) {
    .desktop-nav a,
    .mobile-nav a,
    .donate-button,
    .header-actions button,
    .header-logo img {
        transition: none;
    }
}