.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(186, 230, 253, 0.6);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

.header.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.025em;
    flex-shrink: 0;
    transition: filter 0.3s ease;
}

.logo:hover { filter: drop-shadow(0 0 8px rgba(14, 165, 233, 0.4)); }

.logo-accent {
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    font-weight: 800;
    font-size: 30px;
    letter-spacing: 1px;
}

.logo img { height: 40px; }

.nav-links {
    list-style: none;
    display: flex;
    gap: 36px;
    margin: 0;
    padding: 0;
    align-items: center;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--primary-color);
    padding: 0.25rem 0.5rem;
    line-height: 1;
}

.nav-link {
    position: relative;
    color: #475569;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.3px;
    padding-bottom: 3px;
    transition: color 0.2s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    transition: width 0.3s ease;
}

.nav-link:hover { color: #0284c7; }
.nav-link:hover::after { width: 100%; }

.nav-link.active { color: #0284c7; }
.nav-link.active::after { width: 100%; }

.nav-link-admin {
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: #fff !important;
    border-radius: 999px;
    padding: 6px 16px !important;
    font-size: 13px !important;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: filter 0.2s ease;
    padding-bottom: 6px;
}

.nav-link-admin:hover { filter: brightness(1.1); color: #fff !important; }
.nav-link-admin::after { display: none; }
.nav-link-admin.active::after { display: none; }

.lang-switcher { position: relative; }

.lang-toggle {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 999px;
    padding: 4px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 13px;
    font-weight: 500;
    color: #0284c7;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.lang-toggle:hover {
    background: #e0f2fe;
    border-color: #7dd3fc;
    color: #0284c7;
}

.lang-chevron {
    font-size: 0.65rem;
    transition: transform 0.2s;
}

.lang-switcher.open .lang-chevron { transform: rotate(180deg); }

.lang-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    list-style: none;
    margin: 0;
    padding: 0.3rem 0;
    min-width: 130px;
    z-index: 1000;
}

.lang-switcher.open .lang-dropdown { display: block; }

.lang-dropdown li a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
}

.lang-dropdown li a:hover {
    background: var(--primary-color);
    color: #fff;
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    .header-container {
        padding: 0 1rem;
        height: auto;
        min-height: 64px;
        position: relative;
        flex-wrap: wrap;
    }
    .nav-links {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.97);
        border-top: 1px solid rgba(186, 230, 253, 0.6);
        padding: 0.5rem 0;
        margin-top: 0.5rem;
    }
    .nav-links.open { display: flex; }
    .nav-links li { width: 100%; }
    .nav-links li a { display: block; padding: 0.65rem 1rem; color: #475569; font-size: 14px; }
    .nav-links li a:hover { background: #f0f9ff; color: #0284c7; }
    .nav-link-admin { background: none; color: #0284c7 !important; border-radius: 0; padding: 0.65rem 1rem !important; font-size: 14px !important; filter: none; }
    .nav-link-admin:hover { filter: none; background: #f0f9ff !important; }
    .nav-link::after, .nav-link.active::after { display: none; }
    .lang-switcher {
        padding: 0.5rem 1rem;
        position: relative !important;
        width: auto !important;
    }
    .lang-dropdown {
        position: absolute !important;
        right: 16px !important;
        left: auto !important;
        width: auto !important;
        min-width: 160px !important;
        max-width: 200px !important;
        box-shadow: 0 4px 16px rgba(0,0,0,0.1);
        border: 1px solid #e2e8f0;
        border-radius: 8px !important;
        padding: 4px !important;
        background: #fff;
        z-index: 200;
    }
    .lang-switcher.open .lang-dropdown {
        display: block !important;
        width: auto !important;
    }
    .lang-dropdown li { width: auto !important; }
    .lang-dropdown li a {
        display: flex;
        align-items: center;
        gap: 0.4rem;
        padding: 10px 16px !important;
        border-radius: 6px !important;
        font-size: 14px;
        white-space: nowrap;
        background: transparent;
        border: none;
        width: auto !important;
        min-width: 160px !important;
        max-width: 200px !important;
        box-sizing: border-box !important;
    }
    .lang-dropdown li a:hover {
        background: #e0f2fe;
        color: #0284c7;
    }
}

[dir="rtl"] .nav-link::after {
    left: auto;
    right: 0;
    background: linear-gradient(to left, #06b6d4, #3b82f6);
}

[dir="rtl"] .lang-dropdown {
    right: auto;
    left: 0;
}

@media (min-width: 1440px) { .header-container { max-width: 1380px; } }
@media (min-width: 1920px) { .header-container { max-width: 1700px; } }
@media (min-width: 2560px) { .header-container { max-width: 2200px; } }