/* ============================================
   layout.css — Top Nav, Content Areas, Footer
   "Editorial Blueprint" theme
   ============================================ */

/* ============================================
   Top Navigation
   ============================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(250, 249, 247, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
    gap: var(--space-4);
}

/* Site name — editorial serif with accent underline */
.site-name {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: var(--tracking-tight);
    position: relative;
    white-space: nowrap;
    flex-shrink: 0;
}

.site-name::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-500);
    transform: scaleX(0.4);
    transform-origin: left;
    transition: transform var(--duration-base) var(--ease-out);
}

.site-name:hover {
    color: var(--text-primary);
}

.site-name:hover::after {
    transform: scaleX(1);
}

/* Nav links — center group */
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-links a {
    position: relative;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--duration-fast), background var(--duration-fast);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: var(--bg-alt);
}

.nav-links a.active {
    color: var(--accent-600);
    font-weight: 600;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: var(--space-3);
    right: var(--space-3);
    height: 2px;
    background: var(--accent-500);
    border-radius: 1px;
}

/* Nav right group — search + MVP badge */
.nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

.nav-search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: transparent;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--duration-fast);
}

.nav-search-btn:hover {
    border-color: var(--accent-500);
    color: var(--accent-600);
    background: var(--accent-50);
}

.nav-search-btn .material-symbols-outlined {
    font-size: 20px;
}

.nav-mvp-badge {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0;
}

.mobile-menu-toggle .material-symbols-outlined {
    font-size: 24px;
}

/* Mobile nav overlay */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(28, 25, 23, 0.4);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--duration-base);
}

.mobile-nav-overlay.active {
    opacity: 1;
}

/* Mobile nav panel */
.mobile-nav-panel {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100%;
    background: var(--bg-elevated);
    z-index: 1001;
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    box-shadow: -8px 0 30px rgba(28, 25, 23, 0.1);
    padding: var(--space-6);
    overflow-y: auto;
}

.mobile-nav-panel.active {
    transform: translateX(0);
}

.mobile-nav-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--bg-alt);
    cursor: pointer;
    color: var(--text-primary);
    margin-left: auto;
    margin-bottom: var(--space-6);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.mobile-nav-links a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast);
}

.mobile-nav-links a:hover,
.mobile-nav-links a.active {
    background: var(--accent-50);
    color: var(--accent-600);
}

.mobile-nav-links a .material-symbols-outlined {
    font-size: 20px;
    color: var(--text-tertiary);
}

.mobile-nav-links a.active .material-symbols-outlined {
    color: var(--accent-500);
}

/* ============================================
   Search Overlay
   ============================================ */
.search-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(28, 25, 23, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 12vh;
}

.search-overlay.active {
    display: flex;
    animation: fadeIn 0.2s var(--ease-out);
}

.search-container {
    width: min(640px, 90vw);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: slideDown 0.3s var(--ease-out);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border);
}

.search-input-wrapper .material-symbols-outlined {
    font-size: 22px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: var(--text-lg);
    background: transparent;
    color: var(--text-primary);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-close {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-tertiary);
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    letter-spacing: var(--tracking-wide);
    flex-shrink: 0;
}

.search-results {
    max-height: 50vh;
    overflow-y: auto;
    padding: var(--space-2);
}

.search-results:empty::after {
    content: 'Start typing to search posts...';
    display: block;
    padding: var(--space-6);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.search-result-item {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background var(--duration-fast);
}

.search-result-item:hover {
    background: var(--bg-alt);
}

.search-result-item h4 {
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.search-result-item p {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   Main Content Area
   ============================================ */
.main-content {
    min-height: calc(100vh - var(--nav-height) - 200px);
    padding-top: var(--space-10);
    padding-bottom: var(--space-16);
}

/* Article layout — content + TOC sidebar */
.article-layout {
    display: grid;
    grid-template-columns: 1fr min(var(--article-max), 100%) 1fr;
    min-height: calc(100vh - var(--nav-height));
    padding-bottom: var(--space-16);
}

.article-layout > * {
    grid-column: 2;
}

/* ============================================
   Site Footer
   ============================================ */
.site-footer {
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    padding: var(--space-8) 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
    gap: var(--space-6);
    flex-wrap: wrap;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.footer-tagline {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

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

.footer-sponsor-text {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    max-width: 280px;
}

.btn-sponsor {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-inverse);
    background: var(--accent-500);
    border: none;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--duration-fast);
    white-space: nowrap;
}

.btn-sponsor:hover {
    background: var(--accent-600);
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sponsor .material-symbols-outlined {
    font-size: 18px;
}

.btn-sponsor-outline {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--duration-fast);
    white-space: nowrap;
}

.btn-sponsor-outline:hover {
    border-color: var(--accent-500);
    color: var(--accent-600);
    background: var(--accent-50);
}

.btn-sponsor-outline .material-symbols-outlined {
    font-size: 18px;
}

/* ============================================
   Responsive
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --nav-height: 3.5rem;
    }

    .container {
        padding: 0 var(--space-5);
    }

    .site-nav {
        padding: 0 var(--space-5);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-mvp-badge {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-nav-overlay,
    .mobile-nav-panel {
        display: block;
    }

    .main-content {
        padding-top: var(--space-8);
        padding-bottom: var(--space-12);
    }

    .container {
        padding: 0 var(--space-4);
    }

    .site-nav {
        padding: 0 var(--space-4);
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-4);
        padding: 0 var(--space-4);
    }

    .footer-sponsor {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }

    .footer-sponsor-text {
        max-width: 100%;
    }

    /* Article layout goes single column */
    .article-layout {
        grid-template-columns: 1fr;
        padding: 0 var(--space-4);
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .site-name {
        font-size: var(--text-lg);
    }

    .container {
        padding: 0 var(--space-3);
    }
}