/* layouts.css - Structural layout components */

/* ===== Public Layout (Login, etc.) ===== */
.public-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.public-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--page-padding);
}

.public-container {
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.public-container h1 {
    margin-bottom: var(--space-2);
}

.public-container .subtitle {
    margin-bottom: var(--space-8);
}

/* ===== App Layout (Authenticated) ===== */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width);
    min-width: 0;
}

.app-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow: hidden;
}

.sidebar-header {
    height: var(--header-height);
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar-logo {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-logo:hover {
    text-decoration: none;
}

.sidebar-actions {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* Sidebar Section Titles */
.sidebar-section-title {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-2) var(--space-3);
    margin-bottom: var(--space-1);
}

/* Sidebar Modes */
.sidebar-modes {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--border);
}

.mode-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.mode-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    text-decoration: none;
}

.mode-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.mode-item.active .icon {
    color: var(--accent);
}

/* Sidebar Tools */
.sidebar-tools {
    padding: var(--space-3);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.sidebar-nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-nav-link.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-nav-link.active .icon {
    color: var(--accent);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2) var(--space-3);
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    color: var(--text-tertiary);
    font-size: var(--text-sm);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.sidebar-footer a:hover {
    color: var(--text-secondary);
    text-decoration: none;
}

/* Navigation Groups */
.nav-group {
    margin-bottom: var(--space-1);
}

.nav-group-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: none;
    border: none;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-group-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-chevron {
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.nav-group.open .nav-chevron {
    transform: rotate(90deg);
}

.nav-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.nav-group-toggle:hover .nav-icon,
.nav-group.open .nav-icon {
    color: var(--accent);
}

.nav-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-group-items {
    display: none;
    padding-left: var(--space-3);
}

.nav-group.open .nav-group-items {
    display: block;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3) var(--space-2) var(--space-4);
    color: var(--text-tertiary);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    text-decoration: none;
}

.nav-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-item.active .nav-item-icon {
    color: var(--accent);
}

/* ===== Collapsible Nav Categories ===== */
.nav-category {
    margin-bottom: var(--space-1);
}

.nav-category-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-2);
    background: none;
    border: none;
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-category-header:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-category-header .chevron {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
    transition: transform var(--transition-fast);
}

.nav-category.expanded .nav-category-header .chevron {
    transform: rotate(90deg);
}

.nav-category-items {
    display: none;
    padding-left: var(--space-4);
    margin-top: var(--space-1);
}

.nav-category.expanded .nav-category-items {
    display: block;
}

/* ===== Unified Nav List Items (Models & History) ===== */
.nav-list-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    color: var(--text-tertiary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    text-align: left;
    font-family: inherit;
    position: relative;
}

.nav-list-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-list-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-list-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 16px;
    background: var(--accent);
    border-radius: 1px;
}

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

.nav-list-meta {
    flex-shrink: 0;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-left: var(--space-1);
}

.nav-list-delete {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: var(--radius);
    color: var(--text-tertiary);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
}

.nav-list-item:hover .nav-list-delete {
    opacity: 1;
}

.nav-list-delete:hover {
    color: var(--error);
    background: var(--bg-tertiary);
}

/* Conversation List Container */
.conversation-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--page-padding);
    z-index: 50;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-title {
    font-size: var(--text-xl);
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.breadcrumbs a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.breadcrumbs span {
    color: var(--text-primary);
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* ===== Slide-in Panel ===== */
.panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 400px;
    max-width: 100vw;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(0);
    transition: transform var(--transition-slow);
}

.panel.hidden {
    transform: translateX(100%);
    display: flex;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.panel-header h2 {
    font-size: var(--text-xl);
    font-weight: 600;
}

.panel-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.panel-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

/* ===== Mobile Menu Button ===== */
.mobile-menu-btn {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    background: transparent;
    border: 1px solid var(--border);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
}

.mobile-menu-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Sidebar Close Button (Mobile) */
.sidebar-close {
    display: none;
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    background: transparent;
    border: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-tertiary);
}

.sidebar-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Sidebar Overlay (Mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.sidebar-overlay.open {
    display: block;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
    }

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

    .app-main {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .sidebar-close {
        display: flex;
    }

    .panel {
        width: 100%;
    }
}

@media (max-width: 600px) {
    :root {
        --text-3xl: 1.75rem;
        --text-2xl: 1.25rem;
        --page-padding: 16px;
    }
}