/* ==========================================================================
   Header & Footer CSS - Navigation, Branding, Shared Components
   ========================================================================== */

/* ==========================================================================
   Header Styles
   ========================================================================== */

.main-header {
    background-color: var(--color-background-primary);
    border-bottom: 1px solid var(--color-neutral-light);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-xl);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    z-index: var(--z-modal);
    position: relative;
}

.logo-icon {
    color: var(--color-primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
    white-space: nowrap;
}

/* Main Navigation */
.main-nav {
    display: none;
    margin-left: auto; /* pushes nav (and following items) to the right */
}

@media (min-width: 768px) {
    .main-nav {
        display: flex;
    }
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    white-space: nowrap;

    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);

    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary-blue);
    background-color: var(--color-neutral-light);
}

.nav-link:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-base);
    z-index: var(--z-modal);
    position: relative;
}

.mobile-menu-toggle:hover {
    background-color: var(--color-neutral-light);
}

.mobile-menu-toggle:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

/* Hamburger Lines */
.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--color-text-primary);
    margin: 2px 0;
    transition: all var(--transition-base);
    border-radius: 1px;
}

/* Hamburger Animation */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-background-primary);
    z-index: var(--z-modal-backdrop);
    padding: var(--spacing-6xl) var(--spacing-xl) var(--spacing-4xl);
    overflow-y: auto;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.mobile-nav.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2xl);
    margin: 0;
    padding: 0;
    list-style: none;
    width: 100%;
    max-width: 300px;
}

.mobile-nav-link {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    width: 100%;
    text-align: center;
    border: 2px solid transparent;
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
    background-color: var(--color-primary-blue);
    color: var(--color-text-inverse);
    border-color: var(--color-primary-blue);
}

.mobile-nav-cta {
    margin-top: var(--spacing-3xl);
    width: 100%;
    max-width: 300px;
}

/* ==========================================================================
   Footer Styles
   ========================================================================== */

.main-footer {
    background-color: var(--color-background-secondary);
    border-top: 1px solid var(--color-neutral-light);
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    margin-top: 0;
}

.footer-content {
    display: grid;
    gap: var(--spacing-4xl);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr 2fr;
        gap: var(--spacing-6xl);
    }
}

@media (min-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1.5fr;
    }
}

/* Footer Brand */
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-base);
    margin: 0;
    max-width: 300px;
}

/* Social Icons */
.social-icons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition-base);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link:hover {
    color: var(--color-primary-blue);
    transform: translateY(-2px);
}

.social-link:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
}

/* Footer Links */
.footer-links {
    display: grid;
    gap: var(--spacing-3xl);
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

@media (min-width: 768px) {
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-2xl);
    }
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-md) 0;
}

.footer-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: 0;
    padding: 0;
    list-style: none;
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-base);
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--color-primary-blue);
}

.footer-link:focus {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 2px;
    color: var(--color-primary-blue);
}

/* Footer Bottom */
.footer-bottom {
    margin-top: var(--spacing-4xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-neutral-light);
    text-align: center;
}

.copyright {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ==========================================================================
   Scroll Behavior & Sticky Header
   ========================================================================== */

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

/* Header shadow on scroll */
.main-header.scrolled {
    box-shadow: var(--shadow-md);
    background-color: rgba(255, 255, 255, 0.95);
}

/* Offset for anchor links to account for sticky header */
section[id] {
    scroll-margin-top: 80px;
}

/* ==========================================================================
   Accessibility Enhancements
   ========================================================================== */

/* Focus trap for mobile menu */
.mobile-nav.active {
    overflow: hidden;
}

.mobile-nav.active ~ * {
    filter: blur(2px);
    pointer-events: none;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary-blue);
    color: var(--color-text-inverse);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: var(--z-tooltip);
    transition: top var(--transition-base);
}

.skip-to-content:focus {
    top: 6px;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .main-header,
    .main-footer,
    .mobile-menu-toggle,
    .mobile-nav {
        display: none;
    }

    .main-content {
        margin-top: 0;
    }
}

/* ==========================================================================
   Dark Mode Support (Future Enhancement)
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    .main-header {
        background-color: rgba(0, 0, 0, 0.95);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }

    .main-header.scrolled {
        background-color: rgba(0, 0, 0, 0.98);
    }

    .mobile-nav {
        background-color: rgba(0, 0, 0, 0.95);
    }
}

/* ==========================================================================
   Animation & Micro-interactions
   ========================================================================== */

/* Logo hover effect */
.logo:hover .logo-icon {
    transform: rotate(10deg);
    transition: transform var(--transition-base);
}

/* Nav link hover underline effect */
.nav-link::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--color-primary-blue);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

/* Fade-in animation for mobile menu */
.mobile-nav {
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-nav.active {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation for mobile nav items */
.mobile-nav-link {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.3s ease forwards;
}

.mobile-nav.active .mobile-nav-link:nth-child(1) {
    animation-delay: 0.1s;
}
.mobile-nav.active .mobile-nav-link:nth-child(2) {
    animation-delay: 0.2s;
}
.mobile-nav.active .mobile-nav-link:nth-child(3) {
    animation-delay: 0.3s;
}
.mobile-nav.active .mobile-nav-link:nth-child(4) {
    animation-delay: 0.4s;
}

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