/* ==============================================
   layout.css - Header, Footer, Grid Container
   ============================================== */

/* --- Container --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-6);
    }
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background-color: var(--color-card-bg);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    backdrop-filter: blur(8px);
    background-color: hsla(var(--card), 0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.site-header.header--hidden {
    transform: translateY(-100%);
}

@media (prefers-reduced-motion: reduce) {
    .site-header {
        transition: none;
    }
}

.header-inner {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--space-6);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
    flex-shrink: 0;
}

.header-action-link {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
}

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

.header-action-link svg {
    display: block;
}

.header-logout {
    font-size: var(--text-xs);
    opacity: 0.7;
}

.header-cart {
    position: relative;
}

.cart-badge {
    position: absolute;
    top: -6px;
    right: -8px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 9999px;
    background-color: var(--color-primary);
    color: hsl(var(--primary-foreground));
    font-size: 0.625rem;
    font-weight: var(--font-bold);
    line-height: 16px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: baseline;
    gap: var(--space-15);
    flex-shrink: 0;
}

.logo-text {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-primary);
    letter-spacing: var(--tracking-tight);
}

.logo-sub {
    font-size: var(--text-2xs);
    font-weight: var(--font-medium);
    color: var(--color-text-muted);
    letter-spacing: var(--tracking-widest);
    text-transform: uppercase;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.header-nav::-webkit-scrollbar {
    display: none;
}

.nav-link {
    padding: var(--space-15) var(--space-3);
    font-size: var(--text-md);
    font-weight: var(--font-medium);
    color: var(--color-text-muted);
    border-radius: var(--radius-badge);
    white-space: nowrap;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-secondary-bg);
    font-weight: var(--font-semibold);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    padding: var(--space-6) 0 var(--space-12);
    animation: fadeInUp 0.3s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Form Validation Error States --- */
.form-input-error {
    border-color: var(--color-error) !important;
    box-shadow: 0 0 0 2px hsla(var(--red-400), 0.15);
}

.form-error {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-error);
    margin-top: var(--space-1);
    line-height: var(--leading-snug);
}

/* --- Product Grid: Responsive 2/3/4 columns --- */
.product-grid {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-5);
    }
}

@media (min-width: 1200px) {
    .product-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-6);
    }
}

/* --- Footer --- */
.site-footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-card-bg);
    padding: var(--space-8) 0;
    margin-top: auto;
}

/* Footer Grid */
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

.footer-col-brand .footer-brand {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
}

.footer-brand-en {
    font-weight: var(--font-normal);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    letter-spacing: var(--tracking-widest);
    margin-left: var(--space-1);
}

.footer-col-brand .footer-tagline {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    line-height: var(--leading-normal);
}

.footer-social {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.footer-social a {
    color: var(--color-text-muted);
    transition: color 0.2s;
}

.footer-social a:hover {
    color: var(--color-primary);
}

.footer-col-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.footer-col-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-col-links a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-col-links a:hover {
    color: var(--color-text);
}

.footer-link-bold {
    font-weight: var(--font-semibold);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    padding-top: var(--space-8);
}

.footer-copyright {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin: 0;
}

/* Footer Dark Mode Toggle */
.footer-darkmode-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-15);
    padding: var(--space-15) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    background: var(--color-card-bg);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all 0.15s;
}

.footer-darkmode-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Show/hide icons and labels based on theme */
.footer-darkmode-icon-dark,
.footer-darkmode-label-dark {
    display: none;
}

[data-theme="dark"] .footer-darkmode-icon-light,
[data-theme="dark"] .footer-darkmode-label-light {
    display: none;
}

[data-theme="dark"] .footer-darkmode-icon-dark,
[data-theme="dark"] .footer-darkmode-label-dark {
    display: inline;
}

/* Footer Mobile */
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .footer-col {
        padding-bottom: var(--space-6);
        border-bottom: 1px solid var(--color-border);
    }

    .footer-col:last-child {
        padding-bottom: 0;
        border-bottom: none;
    }
}

/* --- Empty State --- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-16) var(--space-4);
    min-height: 40vh;
    gap: var(--space-4);
}

.empty-state-icon {
    color: var(--color-text-muted);
    opacity: 0.4;
}

.empty-state-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
}

.empty-state-desc {
    font-size: var(--text-md);
    color: var(--color-text-muted);
    line-height: var(--leading-normal);
}