/* ========================================
   LAYOUT STYLES
   Phase 2: Premium structures & spacing
   ======================================== */

/* ===== SITE HEADER ===== */
.site-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--container-padding);
    background-color: rgba(10, 14, 19, 0.95);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-md);
}

.brand-wrapper {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-xl);
    letter-spacing: -0.01em;
    color: var(--white);
    text-transform: uppercase;
    position: relative;
}

.brand-wrapper a {
    position: relative;
    display: inline-block;
}

.brand-wrapper a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 30%;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0.7;
}

/* ===== NAVIGATION ===== */
.main-nav ul {
    display: flex;
    gap: var(--space-2xl);
    align-items: center;
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    position: relative;
    padding: var(--space-xs) 0;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-teal);
    transition: width var(--transition-base);
}

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

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

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border-medium);
    color: var(--white);
    font-size: var(--text-lg);
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.menu-toggle:hover {
    border-color: var(--accent-teal);
    box-shadow: var(--shadow-glow);
}

/* ===== FOOTER ===== */
.site-footer {
    background: linear-gradient(180deg, var(--charcoal) 0%, var(--charcoal-light) 100%);
    padding: var(--space-4xl) 0 var(--space-2xl);
    margin-top: auto;
    border-top: 1px solid var(--border-subtle);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
            transparent 0%,
            var(--accent-teal) 50%,
            transparent 100%);
    opacity: 0.3;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.footer-brand h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-sm);
    font-weight: 700;
}

.footer-brand p {
    max-width: 300px;
    font-size: var(--text-sm);
}

.footer-links ul {
    display: flex;
    gap: var(--space-xl);
}

.footer-links a {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--accent-teal);
}

.copyright {
    text-align: center;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    border-top: 1px solid var(--border-subtle);
    padding-top: var(--space-xl);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== RESPONSIVE LAYOUT ===== */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: rgba(10, 14, 19, 0.98);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-subtle);
        padding: var(--space-md) 0;
        box-shadow: var(--shadow-lg);
    }

    .main-nav.is-open {
        display: block;
        animation: slideDown var(--transition-base);
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }

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

    .main-nav ul {
        flex-direction: column;
        gap: 0;
        align-items: stretch;
    }

    .nav-link {
        display: block;
        padding: var(--space-md) var(--container-padding);
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-link::after {
        bottom: var(--space-md);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: var(--space-2xl);
    }

    .footer-brand p {
        max-width: 100%;
    }

    .footer-links ul {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
}