/**
 * Sidebar Styles v2.0
 * Claude Web Style - Glassmorphism Design
 *
 * @version 2.0.0
 *
 * Layout:
 * - Desktop Expanded: 260px
 * - Desktop Collapsed: 48px
 * - Mobile: Full-width Overlay Drawer
 */

/* ========================================
 * Sidebar-scoped Custom Properties
 * (--sidebar-width / --sidebar-collapsed-width defined in variables.css)
 * ======================================== */

.sidebar {
    --sidebar-header-height: 64px;
    --sidebar-footer-height: 64px;

    /* Sidebar surface — maps to glass tokens */
    --sidebar-bg: var(--glass-bg);
    --sidebar-bg-light: var(--glass-bg-light);
    --sidebar-border: var(--glass-border-subtle);
    --sidebar-border-subtle: var(--glass-bg-light);
    --sidebar-text: var(--text-secondary);
    --sidebar-text-muted: var(--text-tertiary);
    --sidebar-hover: var(--glass-bg-light);
    --sidebar-active-bg: var(--glass-bg-light);
    --sidebar-active-text: var(--color-primary);

    /* Blur — maps to glass tokens */
    --sidebar-blur: var(--glass-blur);
    --sidebar-blur-light: var(--glass-blur-light);
    --sidebar-blur-subtle: var(--glass-blur-subtle);

    /* Avatar */
    --avatar-size: 36px;
    --avatar-bg: var(--gradient-primary);
    --avatar-shadow: var(--shadow-primary);

    /* Dropdown */
    --dropdown-bg: var(--glass-bg);
    --dropdown-shadow: var(--shadow-lg);
    --dropdown-border: var(--glass-bg-light);

    /* Mobile Backdrop */
    --backdrop-bg: var(--modal-backdrop-color);
    --backdrop-blur: var(--glass-blur-sm);

    /* Transitions */
    --sidebar-transition: var(--transition-base);
}

/* ========================================
 * Sidebar Base
 * ======================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    backdrop-filter: var(--sidebar-blur);
    -webkit-backdrop-filter: var(--sidebar-blur);
    border-right: 1px solid var(--sidebar-border);
    box-shadow: none;
    display: flex;
    flex-direction: column;
    z-index: var(--z-dropdown);
    transition: width var(--sidebar-transition), transform var(--sidebar-transition);
    overflow: hidden;
}

/* Main content wrapper adjustment */
body:not(.sidebar-collapsed) .main-content-wrapper {
    margin-left: var(--sidebar-width);
}

body.sidebar-collapsed .main-content-wrapper {
    margin-left: var(--sidebar-collapsed-width);
}

/* ========================================
 * Sidebar Loading State (app.html placeholder)
 * ======================================== */

.sidebar-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 200px;
}

/* ========================================
 * Sidebar Header
 * ======================================== */

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    height: var(--sidebar-header-height);
    border-bottom: none;
}

/* Logo */
.sidebar-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    flex-shrink: 0;
}

.sidebar-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

/* Header Buttons (Search + Add) - iOS 26 Liquid Glass */
.sidebar-header-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    background: var(--sidebar-bg-light);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    border-radius: var(--radius-btn);
    cursor: pointer;
    color: var(--sidebar-text-muted);
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.sidebar-header-btn:hover {
    background: var(--sidebar-hover);
    border-color: var(--glass-border-subtle);
    color: var(--sidebar-active-text);
    transform: scale(1.05);
}

/* Feedback Notification Highlight (Blue — Blau-Only-Konzept) */
.sidebar-header-btn--notified {
    background: var(--primary-alpha-15);
    color: var(--color-primary);
    border-color: var(--primary-alpha-20);
}

.sidebar-header-btn--notified:hover {
    background: var(--primary-alpha-20);
}

/* Header Spacer (pushes toggle right in expanded mode) */
.sidebar-header-spacer {
    flex: 1;
}

/* Toggle Button - iOS 26 Liquid Glass */
.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    background: var(--sidebar-bg-light);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    border-radius: var(--radius-btn);
    cursor: pointer;
    color: var(--sidebar-text-muted);
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: var(--sidebar-hover);
    border-color: var(--glass-border-subtle);
    color: var(--sidebar-active-text);
    transform: scale(1.05);
}

/* ========================================
 * Sidebar Navigation
 * ======================================== */

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-4) var(--spacing-3);
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
}

.sidebar-nav::-webkit-scrollbar {
    display: none;
}

.sidebar-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Navigation Item - iOS 26 Liquid Glass */
.sidebar-nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    color: var(--sidebar-text);
    cursor: pointer;
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-1);
    white-space: nowrap;
    border: 1px solid transparent;
}

.sidebar-nav-item:hover {
    background: var(--sidebar-hover);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    color: var(--sidebar-active-text);
    border-color: var(--glass-border-subtle);
    transform: translateX(4px);
}

.sidebar-nav-item.active {
    background: var(--sidebar-active-bg);
    backdrop-filter: var(--sidebar-blur-light);
    -webkit-backdrop-filter: var(--sidebar-blur-light);
    color: var(--sidebar-active-text);
    font-weight: var(--font-weight-medium);
    border-color: var(--glass-border-subtle);
    box-shadow: none;
}

.sidebar-nav-item.ki-trigger {
    /* Special styling for KI-Assistent button */
}

.sidebar-nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-nav-label {
    font-size: var(--font-size-base);
    transition: opacity var(--transition-fast);
}



/* Navigation Divider */
.sidebar-nav-divider {
    display: flex;
    align-items: center;
    padding: var(--spacing-4) var(--spacing-3) var(--spacing-2);
    margin-top: var(--spacing-2);
}

.sidebar-nav-divider-text {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--sidebar-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* KI-Assistent Separator (removed — clean sidebar) */
.sidebar-ki-separator {
    display: none;
}

/* ========================================
 * Sidebar Footer (Profile)
 * ======================================== */

.sidebar-footer {
    position: relative;
    height: var(--sidebar-footer-height);
    padding: 0 var(--spacing-3);
    display: flex;
    align-items: center;
    border-top: none;
}

/* Profile Button - iOS 26 Liquid Glass */
.sidebar-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.sidebar-profile:hover {
    background: var(--sidebar-hover);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    border-color: var(--glass-border-subtle);
}

.sidebar-profile.open {
    background: var(--sidebar-hover);
    border-color: var(--glass-border-subtle);
}

.sidebar-profile .sidebar-icon {
    color: var(--sidebar-text-muted);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.sidebar-profile.open .sidebar-icon {
    transform: rotate(180deg);
}

/* Avatar - iOS 26 Liquid Glass */
.sidebar-avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    border-radius: var(--radius-full);
    background: var(--avatar-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
    box-shadow: var(--avatar-shadow);
}

/* Profile Info */
.sidebar-profile-info {
    flex: 1;
    min-width: 0;
}

.sidebar-profile-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--sidebar-text);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========================================
 * Profile Dropdown
 * ======================================== */

.sidebar-dropdown {
    position: absolute;
    bottom: calc(100% + var(--spacing-2));
    left: var(--spacing-3);
    right: var(--spacing-3);
    background: var(--dropdown-bg);
    backdrop-filter: var(--sidebar-blur);
    -webkit-backdrop-filter: var(--sidebar-blur);
    border-radius: var(--radius-lg);
    box-shadow: var(--dropdown-shadow);
    border: 1px solid var(--dropdown-border);
    opacity: 0;
    visibility: hidden;
    transform: translateY(var(--spacing-2)) scale(0.98);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
    overflow: hidden;
}

.sidebar-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.sidebar-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--sidebar-text);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    background: none;
    width: 100%;
    font-size: var(--font-size-sm);
    text-align: left;
}

.sidebar-dropdown-item:hover {
    background: var(--sidebar-hover);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    color: var(--sidebar-active-text);
}

.sidebar-dropdown-item .sidebar-icon {
    flex-shrink: 0;
}

.sidebar-dropdown-divider {
    height: 1px;
    background: var(--dropdown-border);
    margin: var(--spacing-1) 0;
}

.sidebar-dropdown-logout {
    color: var(--color-danger);
}

.sidebar-dropdown-logout:hover {
    background: var(--color-danger-light);
    color: var(--color-danger);
}

/* ========================================
 * Collapsed State (Desktop) with Hover-Expand
 * ======================================== */

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
    /* Allow dropdown + tooltips to extend beyond sidebar boundary */
    overflow: visible;
    transition: width var(--transition-base);
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: var(--spacing-4) var(--spacing-1);
}

.sidebar.collapsed .sidebar-header-btn,
.sidebar.collapsed .sidebar-header-spacer {
    display: none;
}

.sidebar.collapsed .sidebar-nav {
    padding: var(--spacing-4) var(--spacing-1);
}

.sidebar.collapsed .sidebar-nav-item {
    justify-content: center;
    padding: var(--spacing-2);
    /* Override hover translateX — no room in 48px sidebar */
}

.sidebar.collapsed .sidebar-nav-item:hover {
    transform: none;
}

.sidebar.collapsed .sidebar-nav-label {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.sidebar.collapsed .sidebar-nav-divider {
    padding: var(--spacing-4) var(--spacing-1) var(--spacing-2);
}

.sidebar.collapsed .sidebar-nav-divider-text {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.sidebar.collapsed .sidebar-ki-separator {
    margin: var(--spacing-3) var(--spacing-1) var(--spacing-1);
}

.sidebar.collapsed .sidebar-footer {
    padding: var(--spacing-3) 0;
}

.sidebar.collapsed .sidebar-profile {
    justify-content: center;
    padding: var(--spacing-1);
}

.sidebar.collapsed .sidebar-profile-info,
.sidebar.collapsed .sidebar-profile .sidebar-icon {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

/* Hover-Expand removed — Sidebar toggles only via burger menu click */

/* Collapsed dropdown - show beside avatar, aligned to bottom */
.sidebar.collapsed .sidebar-dropdown {
    left: calc(100% + var(--spacing-2));
    right: auto;
    top: auto;
    bottom: 0;
    width: 200px;
    transform: translateX(-8px);
}

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

/* Tooltip for collapsed items */
.sidebar.collapsed .sidebar-nav-item {
    position: relative;
}

.sidebar.collapsed .sidebar-nav-item::after {
    content: attr(data-id);
    position: absolute;
    left: calc(100% + var(--spacing-3));
    top: 50%;
    transform: translateY(-50%) scale(0.95);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--bg-inverse);
    backdrop-filter: var(--sidebar-blur-subtle);
    -webkit-backdrop-filter: var(--sidebar-blur-subtle);
    color: var(--text-inverse);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-btn);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition-base);
    z-index: var(--z-tooltip);
    box-shadow: var(--shadow-md);
}

.sidebar.collapsed .sidebar-nav-item:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) scale(1);
}

/* Custom tooltip text */
.sidebar.collapsed .sidebar-nav-item[data-id="dashboard"]::after { content: "Dashboard"; }
.sidebar.collapsed .sidebar-nav-item[data-id="search"]::after { content: "Suchaufträge"; }
.sidebar.collapsed .sidebar-nav-item[data-id="objects"]::after { content: "Objekte"; }
.sidebar.collapsed .sidebar-nav-item[data-id="documents"]::after { content: "Unterlagen"; }
.sidebar.collapsed .sidebar-nav-item[data-id="contacts"]::after { content: "Kontakte"; }
.sidebar.collapsed .sidebar-nav-item[data-id="calendar"]::after { content: "Kalender"; }
.sidebar.collapsed .sidebar-nav-item[data-id="tasks"]::after { content: "Aufgaben"; }
.sidebar.collapsed .sidebar-nav-item[data-id="ki-assistent"]::after { content: "KI-Assistent"; }

/* ========================================
 * Auto-Collapse (Documents Tree Panel visible)
 * Only on desktop >1024px
 * ======================================== */

@media (min-width: 1025px) {
    .sidebar.sidebar--auto-collapsed {
        width: var(--sidebar-collapsed-width);
        min-width: var(--sidebar-collapsed-width);
        overflow: visible;
        transition: width var(--sidebar-transition);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-label,
    .sidebar.sidebar--auto-collapsed .sidebar-nav-divider-text,
    .sidebar.sidebar--auto-collapsed .sidebar-profile-info,
    .sidebar.sidebar--auto-collapsed .sidebar-profile .sidebar-icon,
    .sidebar.sidebar--auto-collapsed .sidebar-logo-text {
        display: none;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-header {
        justify-content: center;
        padding: var(--spacing-4) var(--spacing-1);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-header-btn,
    .sidebar.sidebar--auto-collapsed .sidebar-header-spacer {
        display: none;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav {
        padding: var(--spacing-4) var(--spacing-1);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-item {
        justify-content: center;
        padding: var(--spacing-2);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-item:hover {
        transform: none;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-icon {
        margin: 0;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-divider {
        padding: var(--spacing-4) var(--spacing-1) var(--spacing-2);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-ki-separator {
        margin: var(--spacing-3) var(--spacing-1) var(--spacing-1);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-footer {
        padding: var(--spacing-3) 0;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-profile {
        justify-content: center;
        padding: var(--spacing-1);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-chat-list {
        display: none;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-new-chat-inline {
        display: none;
    }

    /* Tooltips for auto-collapsed items */
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item {
        position: relative;
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-item::after {
        content: attr(data-id);
        position: absolute;
        left: calc(100% + var(--spacing-3));
        top: 50%;
        transform: translateY(-50%) scale(0.95);
        padding: var(--spacing-2) var(--spacing-3);
        background: var(--bg-inverse);
        backdrop-filter: var(--sidebar-blur-subtle);
        -webkit-backdrop-filter: var(--sidebar-blur-subtle);
        color: var(--text-inverse);
        font-size: var(--font-size-xs);
        font-weight: var(--font-weight-medium);
        border-radius: var(--radius-btn);
        white-space: nowrap;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: all var(--transition-base);
        z-index: var(--z-tooltip);
        box-shadow: var(--shadow-md);
    }

    .sidebar.sidebar--auto-collapsed .sidebar-nav-item:hover::after {
        opacity: 1;
        visibility: visible;
        transform: translateY(-50%) scale(1);
    }

    /* Custom tooltip text for auto-collapsed */
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="dashboard"]::after { content: "Dashboard"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="search"]::after { content: "Suchaufträge"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="objects"]::after { content: "Objekte"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="documents"]::after { content: "Unterlagen"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="contacts"]::after { content: "Kontakte"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="calendar"]::after { content: "Kalender"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="tasks"]::after { content: "Aufgaben"; }
    .sidebar.sidebar--auto-collapsed .sidebar-nav-item[data-id="ki-assistent"]::after { content: "KI-Assistent"; }

    /* Adjust main content margin when auto-collapsed */
    body:not(.sidebar-collapsed) .sidebar.sidebar--auto-collapsed ~ .main-content-wrapper {
        margin-left: var(--sidebar-collapsed-width);
    }
}

/* ========================================
 * Mobile Backdrop - iOS 26 Liquid Glass
 * ======================================== */

.sidebar-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--backdrop-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    opacity: 0;
    visibility: hidden;
    transition: all var(--sidebar-transition);
    z-index: var(--z-overlay);
}

/* ========================================
 * Mobile Styles (< 768px) - Sidebar from LEFT
 * ======================================== */

@media (max-width: 768px) {
    /* Mobile Sidebar - Hidden by default, slides from LEFT */
    .sidebar {
        width: 85vw;
        max-width: 320px;
        left: 0;
        right: auto;
        transform: translateX(-100%);
        visibility: hidden;
        pointer-events: none;
        border-left: none;
        border-right: 1px solid var(--sidebar-border);
        box-shadow: none;
        /* FIX: Sidebar ABOVE backdrop (backdrop=400, sidebar=500) */
        z-index: var(--z-modal);
        transition: transform var(--transition-slow), visibility 0s 0.3s;
    }

    /* Main content full width on mobile */
    body:not(.sidebar-collapsed) .main-content-wrapper,
    body.sidebar-collapsed .main-content-wrapper {
        margin-left: 0;
    }

    /* Mobile open state - slide in from left */
    .sidebar.mobile-open {
        transform: translateX(0);
        visibility: visible;
        pointer-events: auto;
        box-shadow: var(--shadow-xl);
        transition: transform var(--transition-slow), visibility 0s 0s;
    }

    /* Backdrop visible when sidebar mobile-open */
    body.sidebar-mobile-open .sidebar-backdrop {
        opacity: 1;
        visibility: visible;
    }

    /* ========================================
     * Reset collapsed state on mobile
     * (Sidebar always shows full expanded layout)
     * ======================================== */

    .sidebar.collapsed {
        width: 85vw;
        max-width: 320px;
        overflow: hidden;
    }

    .sidebar.collapsed .sidebar-header-btn,
    .sidebar.collapsed .sidebar-header-spacer {
        display: flex;
    }

    .sidebar.collapsed .sidebar-nav-label,
    .sidebar.collapsed .sidebar-nav-divider-text,
    .sidebar.collapsed .sidebar-profile-info,
    .sidebar.collapsed .sidebar-profile .sidebar-icon {
        display: block;
        opacity: 1;
    }

    .sidebar.collapsed .sidebar-nav-item {
        justify-content: flex-start;
        padding: var(--spacing-2) var(--spacing-3);
        gap: var(--spacing-3);
    }

    .sidebar.collapsed .sidebar-nav-item:hover {
        transform: none;
    }

    .sidebar.collapsed .sidebar-profile {
        justify-content: flex-start;
        gap: var(--spacing-3);
    }

    .sidebar.collapsed .sidebar-nav-item::after {
        display: none;
    }

    .sidebar.collapsed .sidebar-dropdown {
        left: var(--spacing-3);
        right: var(--spacing-3);
        bottom: calc(100% + var(--spacing-2));
        top: auto;
        width: auto;
    }

    .sidebar.collapsed .sidebar-chat-list {
        display: block;
    }

    .sidebar.collapsed .sidebar-new-chat-inline {
        display: flex;
    }

    /* ========================================
     * Mobile sidebar header — show toggle as close button
     * ======================================== */

    .sidebar-header {
        padding: var(--spacing-3) var(--spacing-4);
    }

    /* Hide scrollbars on mobile (still scrollable) */
    .sidebar-nav,
    .sidebar-chat-list {
        scrollbar-width: none;
    }
    .sidebar-nav::-webkit-scrollbar,
    .sidebar-chat-list::-webkit-scrollbar {
        display: none;
    }

    /* Prevent body scroll when sidebar is open */
    body.sidebar-mobile-open {
        overflow: hidden;
    }

    /* Nav items: bigger touch targets */
    .sidebar-nav-item {
        padding: var(--spacing-3) var(--spacing-3);
        min-height: 44px;
        -webkit-tap-highlight-color: transparent;
    }

    .sidebar-nav-item:hover {
        transform: none;
    }

    /* Profile: bigger touch target */
    .sidebar-profile {
        min-height: 48px;
        -webkit-tap-highlight-color: transparent;
    }
}

/* ========================================
 * Tablet Styles (768px - 1024px)
 * ======================================== */

@media (min-width: 768px) and (max-width: 1024px) {
    /* Auto-collapse on tablet by default */
    .sidebar:not(.expanded) {
        width: var(--sidebar-collapsed-width);
    }

    body:not(.sidebar-expanded) .main-content-wrapper {
        margin-left: var(--sidebar-collapsed-width);
    }
}

/* ========================================
 * Animations
 * ======================================== */

/* @keyframes slideInFromRight — removed (orphan, no references) */
/* @keyframes slideOutToRight — removed (orphan, no references) */
/* @keyframes fadeIn → defined in ki-base.css (single source) */

/* ========================================
 * KI-Assistent Chat-Liste (Flat Design)
 * ======================================== */

/* "+" Button neben KI-Assistent */
.sidebar-new-chat-inline {
    width: 24px;
    height: 24px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    opacity: 0.5;
    transition: opacity var(--transition-fast), background var(--transition-fast);
    color: var(--sidebar-text);
}

.sidebar-new-chat-inline:hover {
    opacity: 1;
    background: var(--glass-border-subtle);
}

/* Chat-Liste Container */
.sidebar-chat-list {
    padding: 0 var(--spacing-2);
    max-height: 50vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--glass-border-subtle) transparent;
}

.sidebar-chat-list::-webkit-scrollbar {
    width: 4px;
}

.sidebar-chat-list::-webkit-scrollbar-thumb {
    background: var(--glass-border-subtle);
    border-radius: var(--radius-sm);
}

/* Chat Item — flat, minimal */
.sidebar-chat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--sidebar-text);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: relative;
}

.sidebar-chat-item:hover {
    background: var(--glass-border-subtle);
}

.sidebar-chat-item.active {
    background: var(--button-ghost-bg-hover);
    color: var(--sidebar-active-text);
}

.chat-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

/* Lock-Icon (Bericht vorhanden) */
.chat-lock-icon {
    flex-shrink: 0;
    opacity: 0.4;
    stroke: var(--color-warning);
}

/* 3-Dot Button — nur bei Hover sichtbar (Desktop) */
.chat-more-btn {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast), background var(--transition-fast);
    color: var(--sidebar-text-muted);
}

.sidebar-chat-item:hover .chat-more-btn {
    opacity: 1;
}

.chat-more-btn:hover {
    background: var(--glass-border-subtle);
}

/* Mobile: 3-Dot immer unsichtbar (Long-Press stattdessen) */
@media (max-width: 768px) {
    .chat-more-btn {
        display: none;
    }
}

/* Inline-Rename Input */
/* ========================================
 * Chat Rename Modal (Claude-Style)
 * ======================================== */

.chat-rename-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-backdrop);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.15s ease;
}

.chat-rename-modal {
    background: var(--gray-800);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow-2xl);
    animation: scaleIn 0.15s ease;
}

.chat-rename-modal h3 {
    color: var(--text-inverse);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-4) 0;
}

.chat-rename-modal input {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    border: 2px solid var(--glass-border-subtle);
    border-radius: var(--radius-md);
    background: var(--glass-border-subtle);
    color: var(--text-inverse);
    font-size: var(--font-size-sm);
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
    box-sizing: border-box;
}

.chat-rename-modal input:focus {
    border-color: var(--color-info);
}

.chat-rename-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-2);
    margin-top: var(--spacing-5);
}

.chat-rename-actions button {
    padding: var(--spacing-2) var(--spacing-5);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    font-family: inherit;
    cursor: pointer;
    transition: background var(--transition-fast);
    border: none;
}

.btn-rename-cancel {
    background: var(--glass-border-subtle);
    color: var(--gray-300);
}

.btn-rename-cancel:hover {
    background: var(--glass-bg-light);
}

.btn-rename-save {
    background: var(--gray-100);
    color: var(--text-primary);
}

.btn-rename-save:hover {
    background: var(--gray-200);
}

.chat-delete-message {
    color: var(--glass-bg-light);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    margin: 0 0 var(--spacing-1) 0;
}

.chat-delete-message strong {
    color: var(--text-inverse);
}

.btn-delete-confirm {
    background: var(--color-danger);
    color: var(--text-inverse);
}

.btn-delete-confirm:hover {
    background: var(--color-danger-dark);
}

/* @keyframes fadeIn → defined in ki-base.css (single source) */

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* ========================================
 * Chat Context Menu
 * ======================================== */

/* Desktop: Dropdown-Menü */
.chat-context-menu {
    position: fixed;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border-subtle);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-1);
    z-index: var(--z-modal);
    min-width: 160px;
    animation: menuFadeIn 0.12s ease;
}

@keyframes menuFadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.chat-context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    color: var(--sidebar-text);
}

.chat-context-menu-item:hover {
    background: var(--glass-border-subtle);
}

.chat-context-menu-item.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.chat-context-menu-divider {
    height: 1px;
    background: var(--glass-border-subtle);
    margin: var(--spacing-1) 0;
}

.chat-context-menu-cancel {
    justify-content: center;
    color: var(--sidebar-active-text);
    font-weight: var(--font-weight-medium);
}

/* Mobile: Action Sheet */
@media (max-width: 768px) {
    .chat-context-menu.action-sheet {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        top: auto;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        padding: var(--spacing-2) var(--spacing-2) calc(env(safe-area-inset-bottom) + var(--spacing-2));
        animation: sheetSlideUp 0.25s ease;
    }

    @keyframes sheetSlideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }

    .chat-context-menu-item {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-base);
    }
}

/* ========================================
 * Collapsed State — Chat-Liste + "+" Button verstecken
 * ======================================== */

.sidebar.collapsed .sidebar-chat-list {
    display: none;
}

.sidebar.collapsed .sidebar-new-chat-inline {
    display: none;
}

/* Chat list stays hidden in collapsed state — only visible when expanded via toggle */

/* Override collapsed hiding on mobile */
@media (max-width: 768px) {
    .sidebar.collapsed .sidebar-chat-list {
        display: block;
    }
    .sidebar.collapsed .sidebar-new-chat-inline {
        display: flex;
    }
}

/* ========================================
 * Print Styles
 * ======================================== */

@media print {
    .sidebar {
        display: none;
    }

    body .main-content-wrapper {
        margin-left: 0;
    }
}