/* ========================================
   DnD-Hub - LAYOUT STYLES
   Navigation, grid, containers, footer
   ======================================== */

/* === App Container === */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* === Main Navigation === */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.main-nav.scrolled {
    background: rgba(10, 10, 15, 0.98);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: var(--content-max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-primary);
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex: 1;
    justify-content: center;
}

.nav-link {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-ui);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: all var(--transition-fast);
    transform: translateX(-50%);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

.nav-link.active {
    color: var(--color-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-shrink: 0;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 100;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* === Main Content === */
.page-content {
    flex: 1;
    margin-top: var(--nav-height);
}

/* === Containers === */
.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-sm {
    max-width: 800px;
}

.container-lg {
    max-width: 1600px;
}

/* === Sections === */
.section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-md);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: var(--space-lg) auto 0;
}

/* === Grid System === */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(var(--card-min-width), 1fr));
}

.grid-auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
}

/* === Flex Utilities === */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* === Sidebar Layout === */
.layout-sidebar {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-xl);
    min-height: calc(100vh - var(--nav-height));
}

.sidebar {
    background: var(--bg-dark);
    border-right: 1px solid var(--border-subtle);
    padding: var(--space-xl);
    position: sticky;
    top: var(--nav-height);
    height: calc(100vh - var(--nav-height));
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: var(--space-xl);
}

.sidebar-title {
    font-family: var(--font-ui);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-ui);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.sidebar-link:hover {
    background: var(--bg-medium);
    color: var(--text-primary);
}

.sidebar-link.active {
    background: rgba(201, 162, 39, 0.15);
    color: var(--color-primary);
}

.sidebar-link svg {
    width: 18px;
    height: 18px;
}

/* === Two Column Layout === */
.layout-two-col {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--space-xl);
}

/* === Footer === */
.main-footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: auto;
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-2xl);
}

.footer-section h4 {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-lg);
    color: var(--color-primary);
}

.footer-section p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

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

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

.social-links {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-medium);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.social-links a:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.social-links svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.footer-bottom {
    max-width: var(--content-max-width);
    margin: var(--space-2xl) auto 0;
    padding: var(--space-lg) var(--space-lg) 0;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

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

/* === Page Headers === */
.page-header {
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darkest) 100%);
    padding: var(--space-3xl) 0;
    border-bottom: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(201, 162, 39, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 50%, rgba(123, 75, 148, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-md);
}

.page-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
}

/* === Breadcrumbs === */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-ui);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-lg);
}

.breadcrumb-item {
    color: var(--text-muted);
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-separator {
    color: var(--text-muted);
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: var(--space-4xl) var(--space-xl);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-xl);
    color: var(--text-muted);
    opacity: 0.5;
}

.empty-state-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
}

.empty-state-text {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}