/* Layout Structures - Sticky Header, Nav, and Footer */

/* Site Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: background var(--transition-normal), 
                backdrop-filter var(--transition-normal), 
                height var(--transition-normal),
                box-shadow var(--transition-normal),
                border-bottom var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    height: 70px;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

/* Header Container */
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

/* Logo */
.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 1100;
    transition: color var(--transition-normal);
}

.site-header.scrolled .logo {
    color: var(--secondary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--gradient-blue-purple);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1rem;
    box-shadow: var(--shadow-glow-blue);
}

/* Navigation Links */
.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    padding: 8px 0;
    transition: color var(--transition-normal);
}

.site-header.scrolled .nav-link {
    color: var(--text-main);
}

.site-header.scrolled .nav-link:hover {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-blue-purple);
    transition: width var(--transition-fast);
    border-radius: var(--radius-full);
}

.nav-link:hover {
    color: var(--text-light);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Hamburger Menu Toggler */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
    padding: 0;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--text-light);
    border-radius: var(--radius-full);
    transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.site-header.scrolled .menu-toggle span {
    background-color: var(--secondary);
}

/* Mobile Menu Active States */
.site-header.nav-active .menu-toggle span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.site-header.nav-active .menu-toggle span:nth-child(2) {
    opacity: 0;
}

.site-header.nav-active .menu-toggle span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Grid System */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* Footer layout */
.site-footer {
    background-color: var(--secondary);
    color: var(--text-light-muted);
    border-top: 1px solid var(--border-dark);
    padding: 80px 0 30px 0;
    font-size: 0.95rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1.5fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: var(--text-light);
    margin-bottom: 24px;
}

.footer-brand p {
    color: var(--text-light-muted);
    margin-bottom: 24px;
    max-width: 320px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-dark);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.social-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    flex-shrink: 0;
}

.social-icon:hover {
    background: var(--gradient-blue-purple);
    color: var(--text-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-blue);
    border-color: transparent;
}

.footer-title {
    font-family: var(--font-display);
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-link {
    color: var(--text-light-muted);
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-light);
    padding-left: 4px;
}

/* Footer Bottom */
.footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-link {
    font-size: 0.85rem;
    color: var(--text-light-muted);
}

.footer-bottom-link:hover {
    color: var(--text-light);
}

.copyright {
    font-size: 0.85rem;
}

/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .site-header {
        height: 70px;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    /* Mobile Navigation Drawer */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-glass-dark);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
        border-left: 1px solid var(--border-glass-dark);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: 100px 48px;
        gap: 32px;
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1050;
        box-shadow: var(--shadow-xl);
    }
    
    .site-header.nav-active .nav-menu {
        right: 0;
    }
    
    .nav-link {
        font-size: 1.25rem;
        color: var(--text-light-muted);
    }
    
    .nav-link:hover {
        color: var(--text-light);
    }
    
    .nav-actions {
        display: none; /* In mobile, CTA is placed inside menu drawer or simplified */
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        max-width: 100%;
    }
}