/*
 * Sidebar navigation — polished dark theme with Gmail-style collapse.
 *
 * Behavior:
 *  - Default: full-width (16rem) sidebar in the flex layout.
 *  - Collapsed (#sidebar.collapsed): the layout slot shrinks to icons-only
 *    width, while hovering the rail expands the inner panel OVER the main
 *    content (the layout slot stays narrow, so content doesn't reflow).
 *  - State is toggled via #sidebar-collapse-btn and persisted in localStorage.
 */

:root {
    --sb-width: 16rem;
    --sb-collapsed-width: 3.75rem;
    /* Light mode: a touch lighter than the old #111827/#0f172a so the rail
       reads softer next to light content. html.dark overrides these to go
       darker instead (see scripts/dark-theme.static.css). */
    --sb-bg: #1c2534;
    --sb-bg-gradient: linear-gradient(180deg, #212c3f 0%, #192233 100%);
    --sb-border: rgba(255, 255, 255, 0.07);
    --sb-text: #9aa7ba;
    --sb-text-hover: #e5eaf1;
    --sb-item-hover-bg: rgba(255, 255, 255, 0.06);
    --sb-item-active-bg: rgba(79, 70, 229, 0.22);
    --sb-accent: #6366f1;
    --sb-transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Layout slot ---- */
#sidebar {
    position: relative;
    width: var(--sb-width);
    flex-shrink: 0;
    transition: width var(--sb-transition);
    z-index: 40;
}

#sidebar.collapsed {
    width: var(--sb-collapsed-width);
}

/* ---- Visible panel (expands over content on hover when collapsed) ---- */
.sidebar-inner {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--sb-width);
    display: flex;
    flex-direction: column;
    background: var(--sb-bg-gradient);
    background-color: var(--sb-bg);
    border-right: 1px solid var(--sb-border);
    overflow: hidden;
    transition: width var(--sb-transition), box-shadow var(--sb-transition);
}

#sidebar.collapsed .sidebar-inner {
    width: var(--sb-collapsed-width);
}

#sidebar.collapsed:hover .sidebar-inner,
#sidebar.collapsed:focus-within .sidebar-inner {
    width: var(--sb-width);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.45);
    transition-delay: 0.12s;
}

/* ---- Header ---- */
.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    height: 3.5rem;
    padding: 0 0.75rem;
    flex-shrink: 0;
    border-bottom: 1px solid var(--sb-border);
}

.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    flex-shrink: 0;
    border-radius: 0.5rem;
    color: var(--sb-text);
    transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-toggle:hover {
    background-color: var(--sb-item-hover-bg);
    color: var(--sb-text-hover);
}

.sidebar-toggle svg {
    width: 1.125rem;
    height: 1.125rem;
}

.sidebar-title {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #f1f5f9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---- Scrollable nav area ---- */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.5rem 0 0.75rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(148, 163, 184, 0.25) transparent;
}

.sidebar-nav::-webkit-scrollbar {
    width: 5px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background-color: rgba(148, 163, 184, 0.25);
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background-color: rgba(148, 163, 184, 0.45);
}

/* ---- Groups ---- */
.nav-group {
    margin-bottom: 0.375rem;
    padding-bottom: 0.375rem;
}

.nav-group + .nav-group {
    border-top: 1px solid var(--sb-border);
    padding-top: 0.5rem;
}

.nav-group-title {
    padding: 0.375rem 1rem 0.375rem;
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #64748b;
    white-space: nowrap;
    transition: opacity 0.15s ease;
}

/* ---- Nav items ---- */
#sidebar .nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1px 0.5rem;
    padding: 0.4375rem 0.625rem;
    border-radius: 0.5rem;
    border-left: none;
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--sb-text);
    white-space: nowrap;
    cursor: pointer;
    position: relative;
    transition: background-color 0.15s ease, color 0.15s ease;
}

#sidebar .nav-item:hover {
    background-color: var(--sb-item-hover-bg);
    color: var(--sb-text-hover);
    border-left: none;
}

#sidebar .nav-item.active {
    background-color: var(--sb-item-active-bg);
    color: #ffffff;
    font-weight: 500;
    border-left: none;
}

#sidebar .nav-item.active::before {
    content: '';
    position: absolute;
    left: -0.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 1.125rem;
    border-radius: 0 2px 2px 0;
    background: var(--sb-accent);
}

#sidebar .nav-item svg {
    width: 1.125rem;
    height: 1.125rem;
    flex-shrink: 0;
    stroke-width: 1.75;
}

#sidebar .nav-item.active svg {
    color: #a5b4fc;
}

/* Text labels fade out in collapsed (non-hovered) state */
.nav-label {
    transition: opacity 0.15s ease;
    overflow: hidden;
    text-overflow: ellipsis;
}

#sidebar.collapsed:not(:hover):not(:focus-within) .nav-label,
#sidebar.collapsed:not(:hover):not(:focus-within) .nav-group-title,
#sidebar.collapsed:not(:hover):not(:focus-within) .sidebar-title,
#sidebar.collapsed:not(:hover):not(:focus-within) #tasks-badge {
    opacity: 0;
}

/* ---- Tasks badge ---- */
#tasks-badge {
    margin-left: auto;
    transition: opacity 0.15s ease;
}

/* ---- Footer (version + user + logout) ---- */
.sidebar-footer {
    flex-shrink: 0;
    border-top: 1px solid var(--sb-border);
    padding: 0.625rem 0.75rem 0.75rem;
}

.sidebar-version {
    font-size: 0.6875rem;
    color: #475569;
    text-align: center;
    padding-bottom: 0.5rem;
    white-space: nowrap;
    transition: opacity 0.15s ease;
}

#sidebar.collapsed:not(:hover):not(:focus-within) .sidebar-version {
    opacity: 0;
}

/* ---- Theme (dark mode) switch ---- */
.sidebar-theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.4375rem 0.625rem;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--sb-text);
    white-space: nowrap;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-theme-toggle:hover {
    background-color: var(--sb-item-hover-bg);
    color: var(--sb-text-hover);
}

.sidebar-theme-toggle svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.sidebar-theme-toggle .nav-label {
    flex: 1;
    text-align: left;
}

.theme-toggle-track {
    flex-shrink: 0;
    width: 1.875rem;
    height: 1.0625rem;
    border-radius: 9999px;
    background-color: rgba(255, 255, 255, 0.15);
    position: relative;
    transition: background-color 0.18s ease, opacity 0.15s ease;
}

.theme-toggle-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 0.8125rem;
    height: 0.8125rem;
    border-radius: 9999px;
    background-color: #e2e8f0;
    transition: transform 0.18s ease;
}

.sidebar-theme-toggle[aria-pressed="true"] .theme-toggle-track {
    background-color: var(--sb-accent);
}

.sidebar-theme-toggle[aria-pressed="true"] .theme-toggle-knob {
    transform: translateX(0.8125rem);
}

.sidebar-theme-toggle:focus-visible {
    outline: 2px solid var(--sb-accent);
    outline-offset: -2px;
}

/* Collapsed rail: fade label + track like the other footer text */
#sidebar.collapsed:not(:hover):not(:focus-within) .sidebar-theme-toggle .nav-label,
#sidebar.collapsed:not(:hover):not(:focus-within) .sidebar-theme-toggle .theme-toggle-track {
    opacity: 0;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.25rem 0.125rem 0.625rem;
    overflow: hidden;
}

.sidebar-avatar {
    width: 2rem;
    height: 2rem;
    flex-shrink: 0;
    border-radius: 9999px;
    background: linear-gradient(135deg, #10b981, #047857);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.sidebar-avatar span {
    color: #ffffff;
    font-size: 0.8125rem;
    font-weight: 600;
}

.sidebar-user-meta {
    min-width: 0;
    overflow: hidden;
}

.sidebar-user-meta #sidebar-username {
    font-size: 0.8125rem;
    font-weight: 500;
    color: #e2e8f0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-meta #sidebar-user-role {
    font-size: 0.6875rem;
    color: #64748b;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-logout {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.75rem;
    width: 100%;
    padding: 0.4375rem 0.625rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: #f0a5a5;
    white-space: nowrap;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-logout:hover {
    background-color: rgba(220, 38, 38, 0.18);
    color: #fca5a5;
}

.sidebar-logout svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

/* Collapsed footer: fade the user text like the nav labels (the avatar and
   logout icon sit at the left edge and stay put during hover expansion) */
#sidebar.collapsed:not(:hover):not(:focus-within) .sidebar-user-meta {
    opacity: 0;
}

.sidebar-user-meta {
    transition: opacity 0.15s ease;
}

/* Focus outline for keyboard users */
#sidebar .nav-item:focus-visible,
.sidebar-toggle:focus-visible,
.sidebar-logout:focus-visible {
    outline: 2px solid var(--sb-accent);
    outline-offset: -2px;
}

/* ---- Mobile (unchanged behavior: hidden until .mobile-open) ---- */
@media (max-width: 768px) {
    #sidebar,
    #sidebar.collapsed {
        width: 0;
    }

    #sidebar .sidebar-inner,
    #sidebar.collapsed .sidebar-inner {
        width: 0;
        border-right: none;
    }

    #sidebar.mobile-open,
    #sidebar.mobile-open.collapsed {
        width: var(--sb-width);
    }

    #sidebar.mobile-open .sidebar-inner,
    #sidebar.mobile-open.collapsed .sidebar-inner {
        width: var(--sb-width);
        border-right: 1px solid var(--sb-border);
    }

    /* Labels always visible on mobile when open */
    #sidebar.mobile-open .nav-label,
    #sidebar.mobile-open .nav-group-title,
    #sidebar.mobile-open .sidebar-title,
    #sidebar.mobile-open .sidebar-version,
    #sidebar.mobile-open #tasks-badge {
        opacity: 1;
    }

    #sidebar.mobile-open .sidebar-user-meta {
        opacity: 1;
    }
}