/* ============================================
   QAARI — Layout
   ============================================ */

/* ── App Shell ── */
.app {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 1fr var(--player-height);
    height: 100vh;
    overflow: hidden;
}

/* ── Sidebar ── */
.sidebar {
    grid-row: 1 / 2;
    grid-column: 1;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: var(--space-6) 0;
    z-index: var(--z-sidebar);
    transition: transform var(--transition-base);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0 var(--space-6) var(--space-8);
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), var(--accent-muted));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--bg-primary);
    flex-shrink: 0;
}

.sidebar-brand h1 {
    font-size: var(--text-2xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    flex: 1;
    padding: 0 var(--space-3);
}

.sidebar-section {
    margin-bottom: var(--space-6);
}

.sidebar-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    padding: 0 var(--space-3) var(--space-2);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    width: 100%;
    text-align: left;
    position: relative;
}

.nav-item:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
}

.nav-item.active {
    color: var(--text-primary);
    background: var(--glass-bg-hover);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent);
    border-radius: var(--radius-full);
}

.nav-item svg,
.nav-item .nav-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    opacity: 0.8;
}

.nav-item.active svg,
.nav-item.active .nav-icon {
    opacity: 1;
    color: var(--accent);
}

/* ── Main Content ── */
.main-content {
    grid-row: 1 / 2;
    grid-column: 2;
    overflow-y: auto;
    overflow-x: hidden;
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-primary) 400px);
    padding-bottom: var(--space-16);
}

/* ── Header / Top Bar ── */
.top-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-8);
    height: var(--header-height);
    background: rgba(10, 10, 15, 0.7);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-subtle);
}

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

.nav-history-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--glass-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.nav-history-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

/* ── Search Bar ── */
.search-container {
    position: relative;
    width: 360px;
    max-width: 100%;
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
    width: 18px;
    height: 18px;
}

.search-input {
    width: 100%;
    padding: var(--space-2) var(--space-4) var(--space-2) 40px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    height: 40px;
}

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

.search-input:focus {
    background: var(--glass-bg-hover);
    border-color: var(--border-hover);
    box-shadow: 0 0 0 2px var(--accent-subtle);
}

/* ── Content Wrapper ── */
.content-wrapper {
    padding: var(--space-8);
    max-width: var(--content-max);
    overflow-x: hidden;
}

/* ── Section ── */
.section {
    margin-bottom: var(--space-12);
}

.section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 700;
}

.section-link {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    cursor: pointer;
}

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

/* ── Grid Layouts ── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-6);
}

.card-grid-lg {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

.card-grid-sm {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

.list-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

/* ── Mobile Hamburger ── */
.hamburger {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    background: none;
    cursor: pointer;
    z-index: calc(var(--z-overlay) + 1);
}

.hamburger svg {
    width: 24px;
    height: 24px;
}

/* ── Mobile Overlay ── */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: calc(var(--z-sidebar) - 1);
}

.sidebar-overlay.active {
    display: block;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: var(--space-4);
    }

    .search-container {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .app {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: var(--sidebar-width);
        transform: translateX(-100%);
        z-index: var(--z-sidebar);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        grid-column: 1;
    }

    .hamburger {
        display: flex;
    }

    .content-wrapper {
        padding: var(--space-4);
    }

    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: var(--space-3);
    }

    .section-title {
        font-size: var(--text-xl);
    }

    .top-header {
        padding: var(--space-3) var(--space-4);
    }

    .search-container {
        width: 100%;
        flex: 1;
        min-width: 0;
    }

    .top-header {
        gap: var(--space-2);
    }
}

@media (max-width: 480px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }

    .content-wrapper {
        padding: var(--space-3);
    }
}