/* ==========================================================================
   BellyFed - Layout Styles
   Linear.app-Inspired with Neon Accents
   ========================================================================== */

/* Header & Navigation
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 255, 229, 0.1);
    transition:
        background-color var(--duration-normal) var(--ease-out),
        border-color var(--duration-normal) var(--ease-out),
        box-shadow var(--duration-normal) var(--ease-out);
}

.site-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(0, 255, 229, 0.2) 20%,
        rgba(0, 255, 229, 0.3) 50%,
        rgba(0, 255, 229, 0.2) 80%,
        transparent 100%);
    opacity: 0.5;
}

[data-theme="light"] .site-header {
    background: rgba(255, 255, 255, 0.85);
    border-bottom-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .site-header::after {
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(0, 112, 243, 0.2) 50%,
        transparent 100%);
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: var(--nav-height);
}

/* Logo */
.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-text {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    letter-spacing: var(--tracking-tight);
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    transition:
        color var(--duration-fast) var(--ease-out),
        text-shadow var(--duration-fast) var(--ease-out);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--neon-cyan);
    box-shadow: 0 0 8px var(--neon-cyan);
    transition: width var(--duration-normal) var(--ease-out);
}

.nav-link:hover {
    color: var(--neon-cyan);
    text-shadow: 0 0 20px rgba(0, 255, 229, 0.5);
}

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

/* Nav Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-cta {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 0;
}

.hamburger-line {
    display: block;
    width: 18px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: var(--radius-full);
    transition:
        transform var(--duration-normal) var(--ease-out),
        opacity var(--duration-normal) var(--ease-out);
}

.menu-toggle.is-active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.is-active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

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

.site-footer {
    position: relative;
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(0, 255, 229, 0.1);
    padding: var(--space-16) var(--space-6);
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    max-width: 500px;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(0, 255, 229, 0.3) 50%,
        transparent 100%);
}

.footer-content {
    max-width: var(--max-width-xl);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.footer-description {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    line-height: var(--leading-relaxed);
}

.footer-column h4 {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    transition: color var(--duration-fast) var(--ease-out);
}

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

/* Footer Bottom */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-tertiary);
    border-radius: var(--radius-md);
    transition:
        color var(--duration-fast) var(--ease-out),
        background-color var(--duration-fast) var(--ease-out);
}

.social-link:hover {
    color: var(--color-text);
    background: var(--color-bg-hover);
}

.social-icon {
    width: 18px;
    height: 18px;
}

/* Container
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--max-width-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-narrow {
    max-width: var(--max-width-md);
}

.container-wide {
    max-width: var(--max-width-2xl);
}

/* Responsive Navigation
   ========================================================================== */

@media (max-width: 900px) {
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: flex-start;
        padding: var(--space-8) var(--space-6);
        gap: var(--space-6);
        background: var(--color-bg);
        border-top: 1px solid var(--color-border);
        transform: translateX(100%);
        opacity: 0;
        visibility: hidden;
        transition:
            transform var(--duration-normal) var(--ease-out),
            opacity var(--duration-normal) var(--ease-out),
            visibility var(--duration-normal) var(--ease-out);
    }

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

    .nav-link {
        font-size: var(--text-lg);
    }

    .nav-cta {
        display: none;
    }
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }

    .footer-brand {
        grid-column: 1 / -1;
        max-width: none;
        text-align: center;
    }
}

@media (max-width: 640px) {
    .main-nav {
        padding: 0 var(--space-4);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-column {
        text-align: center;
    }

    .footer-links {
        align-items: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}