.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    margin-inline: auto;
    width: 100%;
    max-width: 100%;
    z-index: 1000;
    
    background-color: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid transparent;
    box-shadow: none;
    
    padding: 1.2rem 3rem;
    border-radius: 0;
}

.main-header-surface {
    position: absolute;
    inset: -1px;
    z-index: 0;
    pointer-events: none;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: 0;
    box-shadow: none;
    transform-origin: center;
    transition:
        background-color 0.45s ease,
        border-color 0.45s ease,
        border-radius 0.65s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.55s ease;
}

.main-header.scrolled {
    top: 20px;
    width: max-content;
    max-width: calc(100% - 40px);
    padding: 0.6rem 1.5rem;
    
    border-radius: 50px;
}

.main-header.scrolled .main-header-surface {
    background-color: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-color: rgba(255, 255, 255, 0.8);
    border-radius: 50px;
    box-shadow:
        0 10px 30px -10px rgba(122, 162, 247, 0.15),
        0 4px 10px rgba(0, 0, 0, 0.02),
        inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.main-header .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 0;
    width: 100%;
    max-width: 100%;
}

@media (min-width: 769px) {
    .main-header,
    .main-header.scrolled {
        padding: 0;
    }

    .main-header .container {
        display: flex;
        justify-content: space-between;
        gap: 2rem;
        width: 100%;
        padding: 1.2rem 3rem;
    }

    .main-header.scrolled .container {
        align-items: center;
        width: 100%;
        max-width: 100%;
        padding: 0.6rem 1.5rem;
    }

    .main-header.scrolled .nav-links {
        width: max-content;
        flex-wrap: nowrap;
    }
}

@media (max-width: 768px) {
    .main-header .container {
        display: flex;
        justify-content: space-between;
    }

    .main-header {
        padding: 1rem 1.5rem;
    }
    
    .main-header.scrolled {
        width: 94%;
        padding: 0.6rem 1rem;
        border-radius: 20px;
    }
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--heading-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.02em;
    flex-shrink: 0;
    justify-self: start;
}


.main-header .logo { letter-spacing: 0; }
.main-header .site-avatar {
    display: block;
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    border-radius: 50%;
    object-fit: cover;
}
.main-header .nav-menu { display: contents; }
.main-header .nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.main-header .nav-links a { color: var(--text-color); text-decoration: none; font-size: 1rem; font-weight: 500; }
.main-header .nav-links a:hover, .main-header .nav-links a.active { color: var(--primary-color); }
.main-header .nav-actions { display: flex; align-items: center; }
.main-header .nav-actions .support-btn,
.main-header .nav-actions .support-btn:is(:hover, :visited, :focus, :focus-visible, :active) {
    display: flex; align-items: center; justify-content: center; gap: 0.6rem;
    padding: 0.5rem 1.4rem !important; border: 0; border-radius: 50px;
    font-size: 0.95rem; font-weight: 600; text-decoration: none; white-space: nowrap;
    background: var(--accent-color) !important; background-image: none !important;
    color: white !important; box-shadow: 0 4px 15px rgba(247, 125, 170, 0.3);
}
.main-header .support-btn i { color: inherit; }
.mobile-menu-toggle, .mobile-menu-backdrop { display: none; }
@media (max-width: 768px) {
    body.mobile-menu-locked {
        overflow: hidden;
        touch-action: none;
    }

    .main-header,
    .main-header.scrolled {
        top: 0;
        width: 100%;
        max-width: 100%;
        padding: 0.75rem 1rem;
        border-radius: 0;
        transform: translateY(0);
        transition: transform 0.3s ease, top 0.3s ease, width 0.3s ease, padding 0.3s ease;
    }

    .main-header.scrolled {
        top: 10px;
        width: calc(100% - 20px);
        padding: 0.55rem 0.75rem;
        border-radius: 18px;
    }

    .main-header.nav-hidden:not(.mobile-menu-open) {
        transform: translateY(calc(-100% - 20px));
    }

    #main-header .container,
    #main-header.scrolled .container {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: 0;
        width: 100%;
        max-width: 100%;
        min-height: 44px;
        padding: 0;
    }

    .main-header .logo {
        position: relative;
        z-index: 1098;
        gap: 0.45rem;
        margin: 0;
        font-size: 1.25rem;
        letter-spacing: 0;
        transition: opacity 0.2s ease;
    }

    .main-header:not(.mobile-menu-open) .logo {
        z-index: 1103;
    }

    .main-header.mobile-menu-open .logo {
        opacity: 0;
        pointer-events: none;
    }

    .main-header + main > .hero:first-child {
        padding-top: 8rem;
    }

    .main-header .logo-img {
        width: 36px;
        height: 36px;
        object-fit: contain;
    }

    .mobile-menu-toggle {
        position: relative;
        z-index: 1103;
        display: block;
        width: 44px;
        height: 44px;
        flex: 0 0 44px;
        padding: 0;
        color: var(--heading-color);
        background: transparent;
        border: 0;
        cursor: pointer;
    }

    .mobile-menu-toggle span {
        position: absolute;
        left: 10px;
        display: block;
        width: 24px;
        height: 2px;
        background: currentColor;
        border-radius: 2px;
        transform-origin: center;
        transition: top 0.25s ease, width 0.25s ease, opacity 0.2s ease, transform 0.25s ease;
    }

    .mobile-menu-toggle span:nth-child(1) {
        top: 14px;
    }

    .mobile-menu-toggle span:nth-child(2) {
        top: 21px;
        left: 13px;
        width: 18px;
    }

    .mobile-menu-toggle span:nth-child(3) {
        top: 28px;
    }

    .mobile-menu-toggle.active span:nth-child(1),
    .mobile-menu-toggle.active span:nth-child(3) {
        top: 21px;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        width: 0;
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg);
    }

    .mobile-menu-backdrop {
        position: fixed;
        inset: 0;
        z-index: 1099;
        display: block;
        width: 100vw;
        height: 100vh;
        padding: 0;
        background: rgba(35, 40, 62, 0.28);
        border: 0;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .main-header.mobile-menu-open .mobile-menu-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    .main-header .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        z-index: 1101;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        width: min(86vw, 360px);
        height: 100vh;
        height: 100dvh;
        padding: 5.75rem 1.5rem 1.5rem;
        overflow-y: auto;
        overscroll-behavior: contain;
        background: rgba(255, 255, 255, 0.97);
        border-left: 1px solid rgba(122, 162, 247, 0.14);
        box-shadow: -18px 0 48px rgba(65, 72, 104, 0.14);
        backdrop-filter: blur(24px) saturate(150%);
        -webkit-backdrop-filter: blur(24px) saturate(150%);
        transform: translateX(105%);
        visibility: hidden;
        transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0s linear 0.35s;
    }

    .main-header.mobile-menu-open .nav-menu {
        transform: translateX(0);
        visibility: visible;
        transition-delay: 0s;
    }

    .main-header .nav-links {
        display: flex;
        flex: 0 0 auto;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0;
        width: 100%;
        padding: 0;
    }

    .main-header .nav-links > li {
        width: 100%;
    }

    .main-header .nav-links a,
    .main-header .dropdown-toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        min-height: 48px;
        padding: 0.75rem 0;
        color: var(--heading-color);
        border-bottom: 1px solid rgba(122, 162, 247, 0.1);
        font-size: 1rem;
        font-weight: 600;
        letter-spacing: 0;
        opacity: 0.82;
    }

    .main-header .nav-links a:hover,
    .main-header .nav-links a.active,
    .main-header .dropdown.active > .dropdown-toggle {
        color: var(--primary-color);
        opacity: 1;
    }

    .main-header .nav-links a::after {
        display: none;
    }

    .main-header .dropdown-menu,
    .main-header .dropdown:hover .dropdown-menu,
    .main-header .dropdown:focus-within .dropdown-menu {
        position: static;
        display: none;
        width: 100%;
        min-width: 0;
        margin: 0.4rem 0 0.75rem;
        padding: 0.4rem;
        background: rgba(122, 162, 247, 0.06);
        border: 1px solid rgba(122, 162, 247, 0.1);
        border-radius: 8px;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .main-header .dropdown.dropdown-open .dropdown-menu {
        display: block;
    }

    .main-header .dropdown-menu::before {
        display: none;
    }

    .main-header .dropdown-menu a {
        min-height: 42px;
        padding: 0.65rem 0.75rem;
        border: 0;
        font-size: 0.9rem;
    }

    .main-header .nav-actions,
    .main-header .action-buttons {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-end;
        gap: 0.75rem;
        width: 100%;
        margin: auto 0 0;
    }

    .main-header .nav-actions .nav-button {
        width: 100%;
        min-height: 44px;
        padding: 0.7rem 1.25rem !important;
        font-size: 0.92rem;
    }

    .footer-copy {
        flex-direction: column;
        gap: 0.4rem;
    }

    .footer-bottom {
        flex-direction: column;
    }

    .site-lang-menu {
        right: 50%;
        transform: translateX(50%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .main-header,
    .main-header .nav-menu,
    .mobile-menu-backdrop,
    .mobile-menu-toggle span,
    .site-lang-chevron {
        transition-duration: 0.01ms !important;
    }
}