/* Layout - Responsive grid system */

/* Page structure */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

#site-header {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

#main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.nav-brand a {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-brand a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: #fff;
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: var(--color-primary-light);
    color: #fff;
    text-decoration: none;
}

/* Main content area */
#app {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Footer */
#site-footer {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--spacing-md);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-content p {
    font-size: 0.875rem;
    opacity: 0.8;
}

.ad-slot {
    min-width: 320px;
    min-height: 50px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px dashed rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    opacity: 0.5;
}

/* Page placeholder */
.page-placeholder {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Mobile: 320-767px */
@media (max-width: 767px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        padding-top: var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .nav-links.nav-open {
        display: flex;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        text-align: center;
    }

    #app {
        padding: var(--spacing-md);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .ad-slot {
        min-width: 280px;
    }
}

/* Tablet: 768-1023px */
@media (min-width: 768px) and (max-width: 1023px) {
    #app {
        padding: var(--spacing-lg);
    }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
    #app {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
}