/**
 * HeuriSight Navigation System
 * Based on: mockups/apple-redesign/01-main-app-shell.html
 * 
 * Usage:
 *   <nav class="hs-tabs">
 *     <button class="hs-tabs__item hs-tabs__item--active">Tab 1</button>
 *     <button class="hs-tabs__item">Tab 2</button>
 *   </nav>
 */

/* =============================================================================
   TABS
   ============================================================================= */

.hs-tabs {
    display: flex;
    gap: var(--space-1, 4px);
    padding: var(--space-1, 4px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-full, 9999px);
}

.hs-tabs__item {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) var(--space-4, 16px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    background: transparent;
    border: none;
    border-radius: var(--radius-full, 9999px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
    white-space: nowrap;
}

.hs-tabs__item:hover {
    color: var(--text-primary, #1D1D1F);
}

.hs-tabs__item--active {
    background: var(--bg-primary, #FFFFFF);
    color: var(--text-primary, #1D1D1F);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.04));
}

.hs-tabs__item svg {
    width: 16px;
    height: 16px;
}

/* =============================================================================
   TAB VARIANTS
   ============================================================================= */

/* Underline style tabs */
.hs-tabs--underline {
    gap: var(--space-4, 16px);
    padding: 0;
    background: transparent;
    border-radius: 0;
    border-bottom: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

.hs-tabs--underline .hs-tabs__item {
    flex: none;
    padding: var(--space-3, 12px) var(--space-4, 16px);
    border-radius: 0;
    margin-bottom: -1px;
}

.hs-tabs--underline .hs-tabs__item--active {
    background: transparent;
    box-shadow: none;
    border-bottom: 2px solid var(--accent, #0071E3);
    color: var(--accent, #0071E3);
}

/* Boxed tabs (no pill container) */
.hs-tabs--boxed {
    gap: var(--space-2, 8px);
    padding: 0;
    background: transparent;
    border-radius: 0;
}

.hs-tabs--boxed .hs-tabs__item {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
}

.hs-tabs--boxed .hs-tabs__item--active {
    background: var(--accent, #0071E3);
    color: #FFFFFF;
}

/* =============================================================================
   SIDEBAR NAVIGATION
   ============================================================================= */

.hs-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.hs-sidebar-nav__item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-3, 12px) var(--space-4, 16px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    background: transparent;
    border: none;
    border-radius: var(--radius-md, 10px);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
    text-align: left;
    width: 100%;
}

.hs-sidebar-nav__item:hover {
    background: var(--border-light, rgba(0, 0, 0, 0.06));
    color: var(--text-primary, #1D1D1F);
}

.hs-sidebar-nav__item--active {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    color: var(--accent, #0071E3);
}

.hs-sidebar-nav__item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.hs-sidebar-nav__badge {
    margin-left: auto;
    padding: var(--space-1, 4px) var(--space-2, 8px);
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    background: var(--destructive, #FF3B30);
    color: #FFFFFF;
    border-radius: var(--radius-full, 9999px);
}

/* =============================================================================
   BREADCRUMBS
   ============================================================================= */

.hs-breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-sm, 13px);
}

.hs-breadcrumbs__item {
    color: var(--text-secondary, #6E6E73);
    text-decoration: none;
    transition: color var(--duration-fast, 150ms);
}

.hs-breadcrumbs__item:hover {
    color: var(--accent, #0071E3);
}

.hs-breadcrumbs__item--current {
    color: var(--text-primary, #1D1D1F);
    font-weight: 500;
}

.hs-breadcrumbs__separator {
    color: var(--text-tertiary, #86868B);
}

/* =============================================================================
   HEADER NAVIGATION
   ============================================================================= */

.hs-header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
}

.hs-header-nav__item {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) var(--space-4, 16px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    background: transparent;
    border: none;
    border-radius: var(--radius-full, 9999px);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.hs-header-nav__item:hover {
    background: var(--border-light, rgba(0, 0, 0, 0.06));
    color: var(--text-primary, #1D1D1F);
}

.hs-header-nav__item--active {
    background: var(--accent, #0071E3);
    color: #FFFFFF;
}

.hs-header-nav__item svg {
    width: 16px;
    height: 16px;
}

/* =============================================================================
   DROPDOWNS (User/Notifications)
   ============================================================================= */

.header-dropdown {
    position: fixed;
    top: calc(var(--header-height, 52px) + var(--space-2, 8px));
    right: var(--space-6, 24px);
    min-width: 220px;
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-md, 12px);
    box-shadow: var(--shadow-lg, 0 16px 48px rgba(0, 0, 0, 0.12));
    z-index: var(--z-overlay, 300);
}

.header-dropdown__header {
    padding: var(--space-3, 12px) var(--space-4, 16px);
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text-tertiary, #86868B);
    border-bottom: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

.header-dropdown__list {
    padding: var(--space-3, 12px);
    max-height: 320px;
    overflow-y: auto;
}

.user-menu-dropdown {
    padding: var(--space-3, 12px);
}

.user-menu-header {
    margin-bottom: var(--space-3, 12px);
}

.user-menu-name {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
}

.user-menu-email {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
}

.user-menu-divider {
    height: 1px;
    background: var(--border-light, rgba(0, 0, 0, 0.06));
    margin: var(--space-2, 8px) 0;
}

.user-menu-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    font-size: var(--text-sm, 13px);
    color: var(--text-primary, #1D1D1F);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: background var(--duration-fast, 150ms) var(--ease-default);
    text-align: left;
}

.user-menu-item:hover {
    background: var(--border-light, rgba(0, 0, 0, 0.06));
}

.user-menu-item--danger {
    color: var(--destructive, #FF3B30);
}

/* =============================================================================
   PAGINATION
   ============================================================================= */

.hs-pagination {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
}

.hs-pagination__item {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-3, 12px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    background: transparent;
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms);
}

.hs-pagination__item:hover {
    border-color: var(--accent, #0071E3);
    color: var(--accent, #0071E3);
}

.hs-pagination__item--active {
    background: var(--accent, #0071E3);
    border-color: var(--accent, #0071E3);
    color: #FFFFFF;
}

.hs-pagination__item--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.hs-pagination__ellipsis {
    color: var(--text-tertiary, #86868B);
    padding: 0 var(--space-2, 8px);
}

/* =============================================================================
   DARK THEME
   ============================================================================= */

[data-theme="dark"] .hs-tabs {
    background: var(--bg-secondary, #2C2C2E);
}

[data-theme="dark"] .hs-tabs__item--active {
    background: var(--bg-tertiary, #3A3A3C);
}

[data-theme="dark"] .hs-sidebar-nav__item:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .hs-header-nav__item:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .header-dropdown {
    background: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .user-menu-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .hs-pagination__item {
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

/* =============================================================================
   RESPONSIVE
   ============================================================================= */

@media (max-width: 767px) {
    .hs-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .hs-tabs__item {
        flex: none;
    }
    
    .hs-header-nav {
        gap: var(--space-1, 4px);
    }
    
    .hs-header-nav__item {
        padding: var(--space-2, 8px);
    }
    
    .hs-header-nav__item span {
        display: none;
    }
}

/* =============================================================================
   HS-NAV-ITEM (Used by AppLayout sidebar)
   ============================================================================= */

.hs-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.hs-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    background: transparent;
    border: none;
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    text-decoration: none;
    text-align: left;
    width: 100%;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.hs-nav-item:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text-primary, #1D1D1F);
}

.hs-nav-item--active {
    background: var(--bg-primary, #FFFFFF);
    color: var(--text-primary, #1D1D1F);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.04));
}

.hs-nav-item--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

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

.hs-nav-item__icon svg {
    width: 18px;
    height: 18px;
}

.hs-nav-item--active .hs-nav-item__icon {
    color: var(--accent, #0071E3);
}

.hs-nav-item__label {
    flex: 1;
}

.hs-nav-item__badge {
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--text-tertiary, #86868B);
    background: var(--border-light, rgba(0, 0, 0, 0.06));
    padding: 2px 6px;
    border-radius: var(--radius-full, 9999px);
}

/* Conversation Items in Sidebar */
.hs-conversation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3, 12px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    font-size: var(--text-sm, 13px);
    color: var(--text-primary, #1D1D1F);
    background: transparent;
    border: none;
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    text-align: left;
    width: 100%;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.hs-conversation-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

.hs-conversation-item--active {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-left: 3px solid var(--accent, #0071E3);
    padding-left: calc(var(--space-3, 12px) - 3px);
}

.hs-conversation-item--active .hs-conversation-item__title {
    color: var(--accent, #0071E3);
    font-weight: 500;
}

.hs-conversation-item__title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hs-conversation-item__time {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    flex-shrink: 0;
}

.hs-conversation-item__delete {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-tertiary, #86868B);
    border-radius: var(--radius-sm, 6px);
    cursor: pointer;
    opacity: 0;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
    flex-shrink: 0;
}

.hs-conversation-item:hover .hs-conversation-item__delete {
    opacity: 1;
}

.hs-conversation-item__delete:hover {
    background: rgba(255, 59, 48, 0.1);
    color: var(--destructive, #FF3B30);
}

.hs-conversation-item__delete svg {
    width: 14px;
    height: 14px;
}

/* View More button for conversation history */
.hs-load-more-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1, 4px);
    width: 100%;
    padding: var(--space-2, 8px) var(--space-3, 12px);
    margin-top: var(--space-1, 4px);
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--text-tertiary, #86868B);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.hs-load-more-btn:hover {
    color: var(--accent, #0071E3);
    background: var(--accent-subtle, rgba(0, 113, 227, 0.06));
}

.hs-load-more-btn svg {
    width: 12px;
    height: 12px;
    opacity: 0.6;
    transition: opacity var(--duration-fast, 150ms) var(--ease-default);
}

.hs-load-more-btn:hover svg {
    opacity: 1;
}

[data-theme="dark"] .hs-load-more-btn:hover {
    background: rgba(0, 113, 227, 0.12);
}

/* Dark theme for hs-nav-item */
[data-theme="dark"] .hs-nav-item:hover,
[data-theme="dark"] .hs-conversation-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .hs-nav-item--active {
    background: var(--bg-tertiary, #3A3A3C);
}

[data-theme="dark"] .hs-conversation-item--active {
    background: rgba(0, 113, 227, 0.15);
    border-left-color: var(--accent, #0A84FF);
}

[data-theme="dark"] .hs-conversation-item--active .hs-conversation-item__title {
    color: var(--accent, #0A84FF);
}

[data-theme="dark"] .hs-conversation-item__delete:hover {
    background: rgba(255, 59, 48, 0.2);
}

/* =============================================================================
   NAV ITEMS (from mockup 01-main-app-shell.html)
   ============================================================================= */

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    border-radius: var(--radius-md, 12px);
    font-size: var(--text-sm, 13px);
    color: var(--text-primary, #1D1D1F);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.nav-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

.nav-item.active {
    background: var(--bg-primary, #FFFFFF);
    box-shadow: var(--shadow-sm);
}

.nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary, #6E6E73);
}

.nav-item.active .nav-icon {
    color: var(--accent, #0071E3);
}

.nav-icon svg {
    width: 18px;
    height: 18px;
}

.nav-text {
    flex: 1;
}

.nav-badge {
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--text-tertiary, #86868B);
    background: var(--border-light, rgba(0, 0, 0, 0.06));
    padding: 2px 6px;
    border-radius: var(--radius-full, 9999px);
}

/* Conversation Items */
.conversation-item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-3, 12px);
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.conversation-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

.conversation-item.active {
    background: var(--bg-primary, #FFFFFF);
    box-shadow: var(--shadow-sm);
}

.conversation-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm, 8px);
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.conversation-icon svg {
    width: 16px;
    height: 16px;
    color: var(--accent, #0071E3);
}

.conversation-info {
    flex: 1;
    min-width: 0;
}

.conversation-title {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-meta {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin-top: 2px;
}

/* Dark theme for nav items */
[data-theme="dark"] .nav-item:hover,
[data-theme="dark"] .conversation-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .nav-item.active,
[data-theme="dark"] .conversation-item.active {
    background: var(--bg-tertiary, #3A3A3C);
}