/* =========================================================
   Pocket Kit — navigation.css
   ========================================================= */

/* --- App Header --- */
.app-header {
    display: flex;
    align-items: center;
    gap: var(--siblingSpacing);
    height: 55px;
    padding: 0 var(--smSpacing);
    background: var(--surfaceColor);
    box-shadow: var(--boxShadow);
    position: relative;
    z-index: 100;
    flex-shrink: 0;
}

.app-header.accent-surface {
    background: var(--accentColor);
}

/* --- Logo --- */
.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    margin-right: var(--siblingSpacing);
    text-decoration: none;
}

.logo img {
    height: 28px;
    width: auto;
}

/* --- Main Nav --- */
.app-main-nav {
    display: flex;
    align-items: center;
    gap: 2px;
    flex: 1;
}

/* --- Header Links --- */
.header-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 36px;
    padding: 0 12px;
    border-radius: var(--borderRadius);
    border: none;
    background: transparent;
    color: var(--surfaceTxtHintColor);
    font-family: var(--fontFamily);
    font-size: var(--fontSize);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition:
        background var(--animationSpeed),
        color var(--animationSpeed);
    white-space: nowrap;
    user-select: none;
}

.header-link:hover,
.header-link:focus-visible {
    background: var(--surfaceAlt1Color);
    color: var(--surfaceTxtColor);
    text-decoration: none;
    outline: none;
}

.header-link.active {
    background: var(--surfaceAlt2Color);
    color: var(--surfaceTxtColor);
}

.app-header.accent-surface .header-link {
    color: var(--surfaceTxtHintColor);
}

.app-header.accent-surface .header-link:hover,
.app-header.accent-surface .header-link.active {
    background: var(--surfaceAlt2Color);
    color: var(--surfaceTxtColor);
}

/* --- Separator --- */
.app-header-separator {
    flex: 1;
}

/* --- Sidebar --- */
.page-sidebar {
    width: var(--pageSidebarWidth);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    background: var(--surfaceAlt1Color);
    border-right: 1px solid var(--surfaceAlt2Color);
    overflow: hidden;
    position: relative;
    transition: width var(--slideAnimationSpeed);
}

.sidebar-content {
    padding: var(--sidebarSpacing);
    flex: 1;
    overflow: auto;
    min-height: 0;
}

.sidebar-search {
    padding: var(--sidebarSpacing);
    border-bottom: 1px solid var(--surfaceAlt2Color);
    flex-shrink: 0;
}

.sidebar-search .fields {
    flex-wrap: nowrap;
}

.sidebar-search input {
    --inputPadding: var(--sidebarSpacing);
    background: var(--surfaceColor);
    border-color: var(--surfaceAlt3Color);
    height: var(--smBtnHeight);
    font-size: var(--smFontSize);
}

/* --- Nav Groups --- */
.nav-group {
    margin-bottom: var(--siblingSpacing);
}

.nav-group summary {
    list-style: none;
    padding: 4px var(--sidebarSpacing);
    font-size: var(--smFontSize);
    font-weight: 600;
    color: var(--surfaceTxtHintColor);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    user-select: none;
    border-radius: var(--borderRadius);
    transition: color var(--animationSpeed);
}

.nav-group summary::-webkit-details-marker { display: none; }

.nav-group summary:hover {
    color: var(--surfaceTxtColor);
}

/* --- Nav Items --- */
.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 7px var(--sidebarSpacing);
    border: none;
    border-radius: var(--borderRadius);
    background: transparent;
    color: var(--surfaceTxtColor);
    font-family: var(--fontFamily);
    font-size: var(--smFontSize);
    font-weight: 400;
    cursor: pointer;
    text-align: left;
    text-decoration: none;
    transition:
        background var(--animationSpeed),
        color var(--animationSpeed);
    white-space: nowrap;
    overflow: hidden;
    position: relative;
}

.nav-item i {
    flex-shrink: 0;
    color: var(--surfaceTxtHintColor);
    font-size: 16px;
}

.nav-item .txt {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-item:hover {
    background: var(--surfaceAlt2Color);
}

.nav-item.active {
    background: var(--surfaceAlt3Color);
    font-weight: 600;
}

.nav-item.active i {
    color: var(--accentColor);
}

/* --- Pin Button --- */
.nav-item .pin {
    opacity: 0;
    flex-shrink: 0;
    color: var(--surfaceTxtHintColor);
    font-size: 14px;
    padding: 2px;
    border-radius: 3px;
    transition: opacity var(--animationSpeed), color var(--animationSpeed);
}

.nav-item:hover .pin {
    opacity: 1;
}

.nav-item .pin:hover {
    color: var(--surfaceTxtColor);
}

/* --- New Collection Button --- */
.sidebar-content.new-collection {
    flex: none;
    padding: var(--sidebarSpacing);
    border-top: 1px solid var(--surfaceAlt2Color);
}

/* --- Page Header --- */
.page-header {
    display: flex;
    align-items: center;
    gap: var(--siblingSpacing);
    padding: var(--smSpacing) var(--spacing);
    border-bottom: 1px solid var(--surfaceAlt2Color);
    flex-shrink: 0;
}

.page-header.compact {
    padding: var(--tableSpacing) var(--smSpacing);
}

.page-header-primary-btns {
    display: flex;
    align-items: center;
    gap: var(--siblingSpacing);
    margin-left: auto;
}

.page-header-secondary-btns {
    display: flex;
    align-items: center;
    gap: var(--siblingSpacing);
}

/* --- Breadcrumbs --- */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    min-width: 0;
    font-size: var(--smFontSize);
    color: var(--surfaceTxtHintColor);
}

.breadcrumbs > div {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.breadcrumbs > div:not(:first-child)::before {
    content: '/';
    margin-right: 4px;
    opacity: 0.5;
}

.breadcrumbs > div:last-child {
    color: var(--surfaceTxtColor);
    font-weight: 600;
}

/* --- Page Footer --- */
.page-footer {
    display: flex;
    align-items: center;
    gap: var(--smSpacing);
    padding: var(--tableSpacing) var(--smSpacing);
    border-top: 1px solid var(--surfaceAlt2Color);
    font-size: var(--smFontSize);
    color: var(--surfaceTxtHintColor);
    flex-shrink: 0;
}

.total-count {
    flex: 1;
}

.credits {
    display: flex;
    align-items: center;
    gap: var(--siblingSpacing);
}

.credit-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--surfaceTxtHintColor);
    font-size: var(--smFontSize);
    text-decoration: none;
    transition: color var(--animationSpeed);
}

.credit-item:hover {
    color: var(--surfaceTxtColor);
    text-decoration: none;
}

/* --- Drag Handle --- */
.dragline {
    position: absolute;
    right: -3px;
    top: 0;
    bottom: 0;
    width: 6px;
    cursor: col-resize;
    z-index: 10;
}

.dragline:hover,
.dragline:active {
    background: var(--accentColor);
    opacity: 0.4;
}