/* ============================================
   LAYOUT — Header, Footer, Grid, Sidebar
   Gribov Media Theme v1.0.0
   ============================================ */

/* ---- Site Header ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-header-bg, var(--color-surface));
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.site-header__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    flex-shrink: 0;
}

.site-header__logo {
    max-height: 40px;
    width: auto;
}

.site-header__name {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-header__tagline {
    display: none;
}

/* ---- Primary Navigation ---- */
.primary-nav {
    display: flex;
    align-items: center;
}

.primary-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.primary-nav__list li {
    position: relative;
}

.primary-nav__list > li > a {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.85rem;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.primary-nav__list > li > a:hover,
.primary-nav__list > li.current-menu-item > a,
.primary-nav__list > li.current_page_item > a {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

/* Dropdown */
.primary-nav__list .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
}

.primary-nav__list li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.primary-nav__list .sub-menu a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.primary-nav__list .sub-menu a:hover {
    background: var(--color-surface-hover);
    color: var(--color-accent);
}

/* ---- Header Actions ---- */
.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header-search-toggle,
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-surface-hover);
    color: var(--color-text-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.1rem;
}

.header-search-toggle:hover,
.theme-toggle:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

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

.mobile-menu-toggle:hover {
    background: var(--color-surface-hover);
}

.mobile-menu-toggle__bar {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--transition-base);
    position: relative;
}

.mobile-menu-toggle__bar::before,
.mobile-menu-toggle__bar::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--transition-base);
    left: 0;
}

.mobile-menu-toggle__bar::before { top: -7px; }
.mobile-menu-toggle__bar::after { top: 7px; }

.mobile-menu-toggle.active .mobile-menu-toggle__bar {
    background: transparent;
}
.mobile-menu-toggle.active .mobile-menu-toggle__bar::before {
    top: 0;
    transform: rotate(45deg);
}
.mobile-menu-toggle.active .mobile-menu-toggle__bar::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ---- Header Search Overlay ---- */
.header-search {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.header-search.active {
    opacity: 1;
    visibility: visible;
}

.header-search__form {
    width: 90%;
    max-width: 640px;
    transform: translateY(-20px);
    transition: transform var(--transition-base);
}

.header-search.active .header-search__form {
    transform: translateY(0);
}

.header-search__input {
    width: 100%;
    padding: 1.25rem 1.5rem;
    font-size: var(--text-2xl);
    font-weight: 500;
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    outline: none;
    transition: border-color var(--transition-fast);
}

.header-search__input:focus {
    border-color: var(--color-accent);
}

/* ---- Main Content Area ---- */
.site-main {
    min-height: calc(100vh - var(--header-height) - 200px);
}

.site-content {
    display: flex;
    gap: var(--space-10);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-10) var(--content-padding);
}

.site-content__primary {
    flex: 1;
    min-width: 0;
}

.site-content__sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
}

.site-content--no-sidebar {
    display: block;
}

.site-content--sidebar-left {
    flex-direction: row-reverse;
}

/* ---- Posts Grid ---- */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
}

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

/* ---- Section Header ---- */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid var(--color-border);
}

.section-header__title {
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-text);
}

.section-header__link {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent);
}

/* ---- Single Post Layout ---- */
.single-post__header {
    text-align: center;
    max-width: var(--container-narrow);
    margin: 0 auto var(--space-10);
}

.single-post__category {
    display: inline-block;
    padding: 0.3em 0.8em;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-4);
    text-decoration: none;
}

.single-post__title {
    font-size: var(--text-4xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-6);
    color: var(--color-text);
}

.single-post__meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.single-post__meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.single-post__featured {
    margin-bottom: var(--space-10);
    border-radius: var(--radius-xl);
    overflow: hidden;
    max-height: 520px;
}

.single-post__featured img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.single-post__content {
    max-width: var(--container-narrow);
    margin: 0 auto;
    font-size: var(--text-lg);
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.single-post__content h2,
.single-post__content h3,
.single-post__content h4 {
    margin-top: 2em;
    margin-bottom: 0.75em;
    color: var(--color-text);
}

.single-post__content p {
    margin-bottom: 1.5em;
}

.single-post__content img {
    border-radius: var(--radius-lg);
    margin: 2em 0;
}

.single-post__content a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.single-post__tags {
    max-width: var(--container-narrow);
    margin: var(--space-8) auto 0;
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.8);
    margin-top: var(--space-16);
}

.site-footer a {
    color: rgba(255,255,255,0.7);
    transition: color var(--transition-fast);
}
.site-footer a:hover {
    color: #FFFFFF;
}

.site-footer__main {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-10);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-16) var(--content-padding) var(--space-10);
}

.site-footer__col-title {
    font-size: var(--text-base);
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: var(--space-6);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.site-footer__col ul li {
    margin-bottom: var(--space-2);
}
.site-footer__col ul li a {
    font-size: var(--text-sm);
}

.site-footer__about p {
    font-size: var(--text-sm);
    line-height: 1.7;
    color: rgba(255,255,255,0.6);
}

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

.site-footer__social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    transition: all var(--transition-fast);
}
.site-footer__social a:hover {
    background: var(--color-accent);
    color: #FFFFFF;
    transform: translateY(-2px);
}

.site-footer__bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: var(--space-6) var(--content-padding);
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: rgba(255,255,255,0.5);
}

/* ---- Archive / Category Header ---- */
.archive-header {
    text-align: center;
    padding: var(--space-12) 0 var(--space-8);
    margin-bottom: var(--space-8);
    border-bottom: 1px solid var(--color-border);
}

.archive-header__title {
    font-size: var(--text-3xl);
    font-weight: 800;
    margin-bottom: var(--space-3);
}

.archive-header__desc {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ---- 404 Page ---- */
.error-404 {
    text-align: center;
    padding: var(--space-20) var(--content-padding);
    max-width: 600px;
    margin: 0 auto;
}

.error-404__code {
    font-size: 8rem;
    font-weight: 900;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--space-4);
    opacity: 0.15;
}

.error-404__title {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-4);
}

.error-404__text {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */

@media (max-width: 1024px) {
    .posts-grid--three {
        grid-template-columns: repeat(2, 1fr);
    }
    .site-footer__main {
        grid-template-columns: repeat(2, 1fr);
    }
    .site-content__sidebar {
        display: none;
    }
    .site-content {
        display: block;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --content-padding: 1rem;
    }

    .primary-nav {
        display: none;
    }
    .mobile-menu-toggle {
        display: flex;
    }

    .posts-grid,
    .posts-grid--three {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .gm-hero {
        min-height: 360px;
    }
    .gm-hero__title {
        font-size: var(--text-2xl);
    }
    .gm-hero__content {
        padding: var(--space-6);
    }

    .single-post__title {
        font-size: var(--text-2xl);
    }
    .single-post__meta {
        flex-wrap: wrap;
        gap: var(--space-3);
    }

    .site-footer__main {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    .site-footer__bottom {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
}

/* ---- Mobile Navigation Overlay ---- */
.mobile-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-mobile-nav-bg, var(--color-surface));
    z-index: var(--z-overlay);
    padding: var(--space-6);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
}

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

.mobile-nav__list {
    list-style: none;
}

.mobile-nav__list li a {
    display: block;
    padding: var(--space-4) 0;
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-light);
    text-decoration: none;
}

.mobile-nav__list li a:hover {
    color: var(--color-accent);
}

.mobile-nav__list .sub-menu {
    padding-left: var(--space-6);
}

.mobile-nav__list .sub-menu a {
    font-size: var(--text-base);
    font-weight: 400;
    color: var(--color-text-secondary);
}

@media (max-width: 480px) {
    .gm-hero {
        min-height: 280px;
        border-radius: var(--radius-lg);
    }
    .gm-card__body {
        padding: var(--space-4);
    }
    .gm-card__title {
        font-size: var(--text-lg);
    }
}