/* Section Header CSS */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: var(--transition);
}

.site-header.is-sticky {
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    background: rgba(255, 255, 255, 0.98);
}

.header-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--dark);
}

.logo-mark {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-btn);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    transition: var(--transition);
}

.logo:hover .logo-mark {
    transform: rotate(10deg) scale(1.05);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.1;
    color: var(--dark);
}

.brand-title .accent-text {
    color: var(--primary);
}

.brand-sub {
    font-size: 11px;
    font-weight: 600;
    color: var(--gray);
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 28px;
    margin: 0;
    padding: 0;
}

.nav-link {
    font-size: 15px;
    font-weight: 600;
    color: var(--dark);
    text-decoration: none;
    position: relative;
    padding: 8px 0;
    transition: var(--transition);
}

.nav-link:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: var(--transition);
    border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover:after,
.nav-link.active:after {
    width: 100%;
}

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

.btn-header {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.mobile-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    width: 42px;
    height: 42px;
    border-radius: var(--radius-btn);
    color: var(--dark);
    font-size: 18px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.mobile-toggle:hover {
    background: var(--light);
    color: var(--primary);
    border-color: var(--primary);
}

@media (max-width: 991px) {
    .mobile-toggle {
        display: inline-flex;
    }

    .btn-header {
        display: none;
    }

    .nav-menu {
        position: fixed;
        top: 73px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        padding: 24px;
        box-shadow: 0 16px 30px rgba(0, 0, 0, 0.08);
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 16px;
    }

    .nav-link {
        display: block;
        padding: 10px 0;
        font-size: 16px;
    }
}