/* ============================================================================
   NEXUS Alliance Portal - Layout: Header, Navigation, Footer, Grid
   Premium Institutional Layout
   ============================================================================ */

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

.main-content {
    flex: 1;
    width: 100%;
    position: relative;
    z-index: 1;
}

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

/* ---- Header ---- */
.site-header {
    background: linear-gradient(180deg, rgba(12, 18, 32, 0.98) 0%, rgba(6, 9, 15, 0.95) 100%);
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: var(--space-3) var(--space-5);
    height: var(--header-height);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    cursor: pointer;
}

.logo-emblem {
    width: 44px;
    height: 44px;
    border: 2px solid var(--color-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    color: var(--color-gold);
    font-family: var(--font-heading);
    font-weight: 700;
    background: var(--color-gold-subtle);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.logo-emblem.small {
    width: 32px;
    height: 32px;
    font-size: var(--text-sm);
}

.header-logo:hover .logo-emblem {
    box-shadow: 0 0 12px rgba(201, 168, 76, 0.3);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-gold);
    letter-spacing: 4px;
    line-height: 1.1;
}

.logo-subtitle {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: var(--font-body);
    font-weight: 400;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Language Switcher — side-by-side buttons */
.lang-switcher {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-1);
}

.lang-btn {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 4px 10px;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    line-height: 1.4;
}

.lang-btn:hover {
    border-color: var(--color-gold);
    color: var(--color-gold);
}

.lang-btn.active {
    border-color: var(--color-gold);
    color: var(--color-gold);
    background: rgba(212, 175, 55, 0.12);
}

/* Mobile menu button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-2);
    cursor: pointer;
    width: 42px;
    height: 42px;
}

.mobile-menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-gold);
    border-radius: 2px;
    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);
}

/* ---- Navigation ---- */
.site-nav {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: var(--header-height);
    z-index: var(--z-nav);
}

.nav-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-wrap: nowrap;
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--space-4);
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

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

.nav-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-shrink: 0;
    gap: 0;
}

.nav-group-label {
    display: none;
}

.nav-separator-line {
    width: 1px;
    height: 24px;
    background: var(--color-border);
    margin: 0 var(--space-2);
    flex-shrink: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    font-family: var(--font-body);
}

.nav-link:hover {
    color: var(--color-gold-light);
    background: var(--color-gold-subtle);
}

.nav-link.active {
    color: var(--color-gold);
    border-bottom-color: var(--color-gold);
}

.nav-login-btn {
    color: var(--color-gold);
    font-weight: 600;
    border: 1px solid var(--color-gold);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-4);
    margin-left: var(--space-2);
    border-bottom: 1px solid var(--color-gold);
}

.nav-login-btn:hover {
    background: var(--color-gold);
    color: var(--color-bg-primary);
}

.nav-admin-link {
    color: var(--color-info);
}

.nav-admin-link:hover {
    color: var(--color-info);
    background: var(--color-info-bg);
}

.nav-logout {
    color: var(--color-text-muted) !important;
}

.nav-logout:hover {
    color: var(--color-error) !important;
    background: var(--color-error-bg) !important;
}

.nav-username {
    font-size: var(--text-sm);
    color: var(--color-gold);
    font-weight: 500;
    padding: var(--space-3) var(--space-2);
    display: flex;
    align-items: center;
}

.nav-username::before {
    content: '●';
    color: var(--color-success);
    font-size: 8px;
    margin-right: var(--space-2);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-10) 0 var(--space-6);
    position: relative;
    z-index: 1;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.footer-top {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--color-border-muted);
    margin-bottom: var(--space-6);
    gap: var(--space-6);
}

.footer-brand {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

.footer-brand-text {
    display: flex;
    flex-direction: column;
}

.footer-brand-text strong {
    font-family: var(--font-heading);
    color: var(--color-gold);
    font-size: var(--text-base);
    letter-spacing: 2px;
}

.footer-brand-text span {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-5);
    flex-wrap: wrap;
}

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

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

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

.footer-copy {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.footer-disclaimer {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    opacity: 0.7;
    margin-bottom: 0;
}

/* ---- Loading ---- */
.loading-overlay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    gap: var(--space-4);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-gold);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---- Empty state ---- */
.empty-state {
    text-align: center;
    padding: var(--space-10);
    color: var(--color-text-muted);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-3);
}

/* ---- Alert ---- */
.alert {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    margin-bottom: var(--space-4);
}

.alert-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.alert-info {
    background: var(--color-info-bg);
    color: var(--color-info);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* ---- Hidden ---- */
.hidden {
    display: none !important;
}

/* User menu in nav */
.nav-user {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-left: auto;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.nav-user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-gold-subtle);
    border: 1px solid var(--color-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    color: var(--color-gold);
    font-weight: 600;
}

/* ---- Grid utilities ---- */
.grid {
    display: grid;
    gap: var(--space-6);
}

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* ---- Section spacing ---- */
.section {
    padding: var(--space-16) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-header h2 {
    margin-bottom: var(--space-3);
}

.section-header p {
    max-width: 600px;
    margin: 0 auto;
}

/* ---- Page header ---- */
.page-header {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    margin-bottom: var(--space-2);
}

.page-header .subtitle {
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
    margin-bottom: 0;
}