/* ============================================================
   layout.css — Sidebar, header, main grid, responsive
   ============================================================ */

/* ── App shell ───────────────────────────────────────────── */

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 64px 1fr;
    min-height: 100vh;
    transition: grid-template-columns var(--transition-normal);
}

.app-shell.collapsed {
    grid-template-columns: var(--sidebar-collapsed) 1fr;
}

/* ── Sidebar ────────────────────────────────────────────── */

.sidebar {
    grid-row: 1 / -1;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar__brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 20px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    min-height: 64px;
}

.sidebar__logo {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--coral) 0%, var(--burgundy-light) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-base);
    color: #fff;
    flex-shrink: 0;
    letter-spacing: -1px;
}

.sidebar__name {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: #fff;
    opacity: 1;
    transition: opacity var(--transition-normal);
    white-space: nowrap;
}

.app-shell.collapsed .sidebar__name {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar__nav {
    flex: 1;
    padding: 16px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 12px;
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.65);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    border: none;
    background: none;
    font-family: var(--font-family);
    width: 100%;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.nav-item.active {
    background: rgba(232, 115, 90, 0.22);
    color: #fff;
}

.nav-item.active .nav-icon {
    color: var(--coral);
}

.nav-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-label {
    opacity: 1;
    transition: opacity var(--transition-normal);
    overflow: hidden;
}

.app-shell.collapsed .nav-label {
    opacity: 0;
    width: 0;
}

.sidebar__footer {
    padding: 12px 10px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* ── Collapse toggle ─────────────────────────────────────── */

#sidebar-toggle {
    position: absolute;
    top: 18px;
    right: -14px;
    width: 28px;
    height: 28px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    z-index: 200;
    transition: transform var(--transition-normal);
}

.app-shell.collapsed #sidebar-toggle {
    transform: rotate(180deg);
}

/* ── Top Header ──────────────────────────────────────────── */

.app-header {
    grid-column: 2;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    padding: 0 28px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.app-header__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--dark-gray);
    flex: 1;
}

.app-header__search {
    position: relative;
}

.app-header__search input {
    padding: 8px 14px 8px 36px;
    border: 1.5px solid var(--border);
    border-radius: 99px;
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    width: 240px;
    background: var(--beige-light);
    transition: border-color var(--transition-fast), width var(--transition-normal);
}

.app-header__search input:focus {
    outline: none;
    border-color: var(--burgundy);
    width: 320px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
    pointer-events: none;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.user-menu:hover {
    background: var(--beige);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--burgundy), var(--coral));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: #fff;
}

/* ── Main content area ───────────────────────────────────── */

.app-main {
    grid-column: 2;
    padding: 28px 32px;
    overflow-y: auto;
    min-height: 0;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: 4px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ── Grid helpers ────────────────────────────────────────── */

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ── Filter bar ──────────────────────────────────────────── */

.filter-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-chip {
    padding: 5px 14px;
    border-radius: 99px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border: 1.5px solid var(--border);
    cursor: pointer;
    background: var(--bg-card);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.filter-chip.active,
.filter-chip:hover {
    border-color: var(--burgundy);
    color: var(--burgundy);
    background: rgba(107, 35, 70, 0.06);
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 1200px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: var(--sidebar-collapsed) 1fr;
    }

    .app-shell.collapsed {
        grid-template-columns: 0 1fr;
    }

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

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .app-main {
        padding: 20px 16px;
    }
}

@media (max-width: 600px) {

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

    .app-header__search input {
        width: 140px;
    }

    .app-header__search input:focus {
        width: 180px;
    }
}