/* Sidebar navigation, its collapsed (desktop) and slide-out (mobile) states.
   Markup: pages/common/sidebar.php; behaviour: toggleSidebar() in the shared JS. */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 220px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
        left 0.25s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
}

.logo {
    padding: 20px 16px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    transition: padding 0.2s, justify-content 0.2s;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.logo-text h2 {
    font-size: var(--fs-md);
    font-weight: 700;
    color: #fff;
}

.logo-text p {
    font-size: var(--fs-2xs);
    color: rgba(255, 255, 255, .45);
}

.nav {
    padding: 12px 8px;
    flex: 1;
}

.nav-section {
    font-size: var(--fs-2xs);
    font-weight: 600;
    color: rgba(255, 255, 255, .3);
    padding: 8px 8px 4px;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    color: rgba(255, 255, 255, .55);
    font-size: var(--fs-sm);
    font-weight: 500;
    transition: all .15s;
    margin-bottom: 2px;
}

.nav-item:hover {
    background: rgba(255, 255, 255, .07);
    color: #fff;
}

.nav-item.active {
    background: var(--accent);
    color: #fff;
}

.nav-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: .8;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid rgba(255, 255, 255, .08);
}

.logo-text,
.nav-section,
.nav-item span {
    transition: opacity 0.2s ease, visibility 0.2s ease;
    white-space: nowrap;
}

@media (min-width: 769px) {
    /* Collapsed state styling on desktop */
    .app-shell.sidebar-collapsed .sidebar {
        width: 64px;
    }

    .app-shell.sidebar-collapsed .main {
        margin-left: 64px;
    }

    .app-shell.sidebar-collapsed .logo-text,
    .app-shell.sidebar-collapsed .nav-section,
    .app-shell.sidebar-collapsed .nav-item span {
        opacity: 0;
        visibility: hidden;
        display: none;
    }

    .app-shell.sidebar-collapsed .logo {
        justify-content: center;
        padding: 20px 0 12px;
    }

    .app-shell.sidebar-collapsed .nav-item {
        justify-content: center;
        padding: 8px 0;
        margin: 0 8px 2px;
    }

    /* Sidebar hover expansion float */
    .app-shell.sidebar-collapsed .sidebar:hover {
        width: 220px;
        box-shadow: 4px 0 25px rgba(0, 0, 0, 0.25);
    }

    .app-shell.sidebar-collapsed .sidebar:hover .logo-text,
    .app-shell.sidebar-collapsed .sidebar:hover .nav-section,
    .app-shell.sidebar-collapsed .sidebar:hover .nav-item span {
        opacity: 1;
        visibility: visible;
        display: inline;
    }

    .app-shell.sidebar-collapsed .sidebar:hover .logo {
        padding: 20px 16px 12px;
    }

    .app-shell.sidebar-collapsed .sidebar:hover .nav-item {
        justify-content: flex-start;
        padding: 8px 10px;
        margin: 0 8px 2px;
    }
}

@media (max-width: 768px) {
    /* Mobile responsive view drawer */
    .sidebar {
        left: -220px;
        width: 220px;
    }

    .app-shell.sidebar-open .sidebar {
        left: 0;
    }

    /* Overlay backdrop for mobile slide-out */
    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 1000;
        display: none;
        opacity: 0;
        transition: opacity 0.25s ease;
    }

    .app-shell.sidebar-open .sidebar-overlay {
        display: block;
        opacity: 1;
    }
}