/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
    /* Default Dark Theme */
    --color-bg-primary: #0f0f0f;
    --color-bg-secondary: #171717;
    --color-bg-tertiary: #202020;
    --color-bg-hover: #2a2a2a;
    --color-bg-active: #343434;

    --color-text-primary: #ececec;
    --color-text-secondary: #b4b4b4;
    --color-text-tertiary: #8e8e8e;

    --color-accent-primary: #10a37f;
    --color-accent-hover: #0d8f6f;
    --color-accent-active: #0a7a5f;

    --color-border-primary: #2f2f2f;
    --color-border-secondary: #404040;

    /* Error Colors */
    --color-error-bg: rgba(239, 68, 68, 0.1);
    --color-error-text: #ef4444;
    --color-error-border: rgba(239, 68, 68, 0.3);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #10a37f 0%, #0d8f6f 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(15, 15, 15, 0) 0%, rgba(15, 15, 15, 0.8) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 60px;
    --sidebar-width-mobile: 280px;
    --header-height: 60px;
}

/* Light Theme Overrides */
[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9f9f9;
    --color-bg-tertiary: #f0f0f0;
    --color-bg-hover: #e5e5e5;
    --color-bg-active: #dbdbdb;

    --color-text-primary: #202123;
    --color-text-secondary: #6e6e80;
    --color-text-tertiary: #9a9a9a;

    --color-border-primary: #e5e5e5;
    --color-border-secondary: #d1d1d1;

    --color-accent-primary: #10a37f;
    --color-accent-hover: #1a7f64;
    --color-accent-active: #156a52;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input,
textarea,
select {
    font-family: inherit;
    color: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ========================================
   LOGIN SCREEN
   ======================================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--color-bg-primary);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.login-box {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.logo-icon {
    width: 36px;
    height: 36px;
    color: white;
}

.login-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-header p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group input,
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-control:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.form-group input::placeholder {
    color: var(--color-text-tertiary);
}

.form-control {
    background: var(--color-bg-tertiary);
}

.form-control option {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.form-help-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-sm);
    line-height: 1.5;
}

.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1rem;
    background: var(--color-error-bg);
    border: 1px solid var(--color-error-border);
    border-radius: var(--radius-md);
    color: var(--color-error-text);
    font-size: var(--font-size-sm);
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

.error-message svg {
    flex-shrink: 0;
}

.btn-login,
.btn {
    padding: 0.875rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-login,
.btn-primary {
    background: var(--gradient-accent);
    color: white;
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-primary);
}

.btn:hover,
.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active,
.btn-login:active {
    transform: translateY(0);
}

.btn:disabled,
.btn-login:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-loader {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.spinner-circle {
    stroke-dasharray: 50;
    stroke-dashoffset: 25;
    animation: dash 1.5s ease-in-out infinite;
}

@keyframes dash {
    0% {
        stroke-dashoffset: 50;
    }

    50% {
        stroke-dashoffset: 12.5;
    }

    100% {
        stroke-dashoffset: 50;
    }
}

/* ========================================
   CHAT INTERFACE
   ======================================== */
.chat-interface {
    --sidebar-width: 260px;
    --sidebar-width-mobile: 100%;
    --sidebar-collapsed-width: 60px;
    --header-height: 60px;
    --transition-base: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Resizer */
.sidebar-resizer {
    width: 4px;
    background: transparent;
    position: absolute;
    right: -2px;
    top: 0;
    bottom: 0;
    cursor: col-resize;
    z-index: 10;
    transition: background 0.2s;
}

.sidebar-resizer:hover,
.sidebar-resizer.resizing {
    background: var(--color-primary);
}

/* ========================================
   SIDEBAR
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-primary);
    display: flex;
    flex-direction: column;
    transition: width 0.1s ease;
    /* Faster transition for resizing */
    position: relative;
    flex-shrink: 0;
    z-index: 100;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width) !important;
    /* Force width when collapsed */
}

.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .section-title,
.sidebar.collapsed .user-info,
.sidebar.collapsed .chevron,
.sidebar.collapsed .projects-list,
.sidebar.collapsed .chat-history {
    display: none;
}

/* Sidebar Collapsed Fixes */
/* Sidebar Collapsed Fixes - Removed old block to avoid conflicts */

.sidebar.collapsed .user-button {
    justify-content: center;
}

/* Default Icon Visibility */
.app-logo-visible {
    display: block;
    pointer-events: none;
    /* Ensure clicks pass through to container */
}

.app-logo-hover-expand {
    display: none;
    width: 28px;
    height: 28px;
    color: var(--color-text-primary);
    flex-shrink: 0;
    pointer-events: none;
    /* Ensure clicks pass through to container */
}

/* Sidebar Header Layout */
.sidebar-header {
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    height: var(--header-height);
}

.sidebar-logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    overflow: hidden;
    cursor: default;
    padding: 4px;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    position: relative;
    z-index: 10;
    /* Ensure it's above other elements if needed */
}

.sidebar-logo-container:hover {
    /* Only hover effect when collapsed, handled below */
}

.logo-icon-small {
    width: 28px;
    height: 28px;
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.sidebar-title {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
    white-space: nowrap;
    pointer-events: none;
}

.btn-collapse-sidebar {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    flex-shrink: 0;
    color: var(--color-text-secondary);
}

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

/* ========================================
   SIDEBAR COLLAPSED STATE
   ======================================== */
.sidebar.collapsed .sidebar-header {
    padding: var(--spacing-md) 0;
    justify-content: center;
}

.sidebar.collapsed .sidebar-logo-container {
    justify-content: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    /* Critical for click event */
}

.sidebar.collapsed .sidebar-logo-container:hover {
    background: var(--color-bg-hover);
}

.sidebar.collapsed .sidebar-title {
    display: none;
}

.sidebar.collapsed .btn-collapse-sidebar {
    display: none;
}

/* Icon Swapping Logic on Hover (Collapsed Only) */
.sidebar.collapsed .sidebar-logo-container:hover .app-logo-visible {
    display: none !important;
}

.sidebar.collapsed .sidebar-logo-container:hover .app-logo-hover-expand {
    display: block !important;
}

/* Mobile Close Button - Hidden by default */
.btn-close-sidebar-mobile {
    display: none;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px;
    margin-left: auto;
    /* Push to right */
    z-index: 1001;
    /* Ensure on top */
}

.btn-close-sidebar-mobile:hover {
    color: var(--color-text-primary);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

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

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

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-bg-active);
}

.sidebar-nav {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border-primary);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
    text-align: left;
    width: 100%;
}

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

.nav-item svg {
    flex-shrink: 0;
}

.sidebar-section {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border-primary);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-icon-small {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.btn-icon-small:hover {
    background: var(--color-bg-hover);
}

.projects-list,
.chat-history {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.project-item,
.chat-history-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.project-item:hover,
.chat-history-item:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.project-item.active,
.chat-history-item.active {
    background: var(--color-bg-active);
    color: var(--color-text-primary);
}

.project-item svg,
.chat-history-item svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.project-item.child {
    padding-left: 2rem;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border-primary);
}

.user-menu {
    position: relative;
}

.user-button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.user-button:hover {
    background: var(--color-bg-hover);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-initials {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: white;
}

.user-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.user-display-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-username {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.user-button:hover .chevron {
    transform: translateY(2px);
}

.user-dropdown {
    position: absolute;
    bottom: 100%;
    left: 0;
    right: 0;
    margin-bottom: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.2s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1rem;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
    text-align: left;
}

.dropdown-item:hover {
    background: var(--color-bg-hover);
}

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

/* ========================================
   MAIN CHAT AREA
   ======================================== */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-primary);
    position: relative;
}

/* Mobile Header */
.mobile-header {
    display: none;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    height: var(--header-height);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-primary);
    position: sticky;
    top: 0;
    z-index: 90;
}

.btn-mobile-menu {
    padding: var(--spacing-xs);
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 91;
    /* Ensure clickable */
}

.mobile-model-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-left: var(--spacing-md);
    cursor: pointer;
}

.mobile-model-selector:hover {
    color: var(--color-text-primary);
}

.mobile-model-selector svg {
    width: 16px;
    height: 16px;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        /* Start hidden */
        top: 0;
        bottom: 0;
        width: var(--sidebar-width-mobile);
        z-index: 1000;
        transition: left var(--transition-base);
        /* Use left instead of width */
        box-shadow: var(--shadow-xl);
        background: var(--color-bg-secondary);
    }

    .sidebar.open {
        left: 0;
        /* Slide in */
        width: var(--sidebar-width-mobile);
        /* Ensure width is correct */
    }

    /* Force full content visibility on mobile when open, ignoring collapsed state */
    .sidebar.open .sidebar-title,
    .sidebar.open .nav-text,
    .sidebar.open .project-item span,
    .sidebar.open .user-info {
        display: block !important;
        opacity: 1 !important;
        visibility: visible !important;
    }

    .sidebar.open .sidebar-logo-container {
        justify-content: flex-start;
        /* Align logo left */
        width: auto;
    }

    .sidebar.open .app-logo-visible {
        display: block !important;
    }

    .sidebar.open .app-logo-hover-expand {
        display: none !important;
    }

    /* Show mobile close button */
    .sidebar.open .btn-close-sidebar-mobile {
        display: flex !important;
    }

    /* Hide desktop collapse button on mobile */
    .sidebar .btn-collapse-sidebar {
        display: none !important;
    }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        transition: opacity var(--transition-base);
        pointer-events: none;
    }

    .sidebar-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

    .mobile-header {
        display: flex;
    }
}

/* Project Header & Breadcrumbs */
.project-header-container {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-primary);
    background: var(--color-bg-primary);
    display: none;
    /* Hidden by default */
}

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    margin-left: var(--spacing-xs);
    color: var(--color-text-tertiary);
}

.project-title-area h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--color-bg-active);
}

.chat-messages {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.welcome-content {
    text-align: center;
    max-width: 600px;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.welcome-logo {
    width: 64px;
    height: 64px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.welcome-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-content p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* Message Styles */
.message {
    padding: var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-primary);
    animation: messageSlideIn 0.3s ease-out;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    background: var(--color-bg-secondary);
}

.message.assistant {
    background: var(--color-bg-primary);
}

.message-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-lg);
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.message-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.message.user .message-avatar {
    background: var(--gradient-primary);
}

.message.assistant .message-avatar {
    background: var(--gradient-accent);
}

.message-avatar svg {
    width: 20px;
    height: 20px;
    color: white;
}

.message-text {
    flex: 1;
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-primary);
}

.message-text p {
    margin-bottom: var(--spacing-md);
}

.message-text p:last-child {
    margin-bottom: 0;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 6px;
    padding: var(--spacing-sm) 0;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--color-text-tertiary);
    border-radius: var(--radius-full);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) {
    animation-delay: 0s;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {

    0%,
    60%,
    100% {
        transform: translateY(0);
        opacity: 0.5;
    }

    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* ========================================
   CHAT INPUT
   ======================================== */
.chat-input-container {
    padding: var(--spacing-lg);
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border-primary);
}

.chat-input-form {
    max-width: 800px;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm);
    transition: all var(--transition-base);
}

.input-wrapper:focus-within {
    border-color: var(--color-border-secondary);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-size: var(--font-size-base);
    line-height: 1.5;
    padding: 0.75rem;
    max-height: 200px;
    overflow-y: auto;
}

.message-input::-webkit-scrollbar {
    width: 6px;
}

.message-input::-webkit-scrollbar-track {
    background: transparent;
}

.message-input::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.message-input::placeholder {
    color: var(--color-text-tertiary);
}

.btn-send {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.btn-send:not(:disabled) {
    background: var(--gradient-accent);
    box-shadow: var(--shadow-md);
}

.btn-send:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-send:not(:disabled):active {
    transform: translateY(0);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-send svg {
    color: white;
}

/* ========================================
   MODALS
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-small {
    width: 100%;
    max-width: 500px;
}

.modal-large {
    width: 100%;
    max-width: 1000px;
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.btn-close-modal {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.btn-close-modal:hover {
    background: var(--color-bg-hover);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
}

.modal-body::-webkit-scrollbar {
    width: 8px;
}

.modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

.modal-with-sidebar {
    display: flex;
    padding: 0;
    overflow: hidden;
}

.modal-sidebar {
    width: 240px;
    background: var(--color-bg-tertiary);
    border-right: 1px solid var(--color-border-primary);
    padding: var(--spacing-lg);
    overflow-y: auto;
}

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

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

.modal-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.modal-nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-xs);
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
}

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

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

/* Project Tree Styles */
.project-tree-container {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.project-item-wrapper {
    display: flex;
    flex-direction: column;
}

.project-item-header {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all 0.2s;
    gap: 8px;
    user-select: none;
}

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

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

.project-toggle-icon {
    width: 16px;
    height: 16px;
    min-width: 16px;
    /* Prevent shrinking */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
    color: var(--color-text-tertiary);
    border-radius: 4px;
    flex-shrink: 0;
    /* Don't shrink */
}

.project-toggle-icon svg {
    width: 10px;
    height: 10px;
}

.project-toggle-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

/* Empty toggle icon for projects without children - maintain spacing */
.project-toggle-icon:empty {
    visibility: hidden;
    /* Keep space but hide */
}

.project-item-wrapper.expanded>.project-item-header .project-toggle-icon {
    transform: rotate(90deg);
}

.project-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
}

.project-children {
    display: none;
    flex-direction: column;
    padding-left: 14px;
    /* Indentation for children */
    border-left: 1px solid var(--color-border-secondary);
    margin-left: 20px;
}

.project-item-wrapper.expanded>.project-children {
    display: flex;
}

/* Hide children container if empty to avoid border artifacts */
.project-children:empty {
    display: none !important;
}

.sidebar.collapsed .project-children {
    display: none !important;
}

.sidebar.collapsed .project-toggle-icon {
    display: none;
}

.sidebar.collapsed .project-item-header {
    justify-content: center;
    padding: 8px;
}

.sidebar.collapsed .project-name {
    display: none;
}

.modal-main-content {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
}

.modal-main-content::-webkit-scrollbar {
    width: 8px;
}

.modal-main-content::-webkit-scrollbar-track {
    background: transparent;
}

.modal-main-content::-webkit-scrollbar-thumb {
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.settings-tab {
    display: none;
}

.settings-tab.active {
    display: block;
}

.settings-tab h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.settings-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
}

.setting-info {
    flex: 1;
}

.setting-info label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.setting-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.setting-item .form-control {
    width: 200px;
}

.tab-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.tab-header h3 {
    margin: 0;
}

.tab-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

.data-table-container {
    overflow-x: auto;
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--color-bg-tertiary);
}

.data-table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-primary);
}

.data-table td {
    padding: 0.75rem 1rem;
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border-primary);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:hover {
    background: var(--color-bg-hover);
}

.table-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-table-action {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.btn-table-action:hover {
    background: var(--color-bg-active);
}

.btn-edit {
    color: var(--color-accent-primary);
}

.btn-delete {
    color: var(--color-error-text);
}

/* Profile Edit Styles */
.profile-avatar-edit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.avatar-large {
    width: 120px;
    height: 120px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.avatar-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-initials-large {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: white;
}

.btn-change-avatar {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 40px;
    height: 40px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-change-avatar:hover {
    background: var(--color-accent-hover);
    transform: scale(1.1);
}

.btn-change-avatar svg {
    color: white;
}

.profile-upload-input {
    display: none;
}

.permissions-container {
    max-width: 600px;
}

.permissions-grid {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.permission-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
}

.permission-info {
    flex: 1;
}

.permission-info h4 {
    font-size: var(--font-size-base);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.permission-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.permission-toggle {
    position: relative;
    width: 48px;
    height: 24px;
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
}

.permission-toggle.active {
    background: var(--color-accent-primary);
}

.permission-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.permission-toggle.active::after {
    left: 26px;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: var(--sidebar-width-mobile);
        transform: translateX(-100%);
        box-shadow: var(--shadow-xl);
    }

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

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

    .mobile-header {
        display: flex;
    }

    .chat-main {
        height: calc(100vh - 60px);
    }

    .login-box {
        padding: var(--spacing-xl);
    }

    .welcome-content h2 {
        font-size: var(--font-size-xl);
    }

    .welcome-content p {
        font-size: var(--font-size-base);
    }

    .message {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .message-content {
        gap: var(--spacing-md);
    }

    .chat-input-container {
        padding: var(--spacing-md);
    }

    .modal-large {
        max-width: 100%;
    }

    .modal-with-sidebar {
        flex-direction: column;
    }

    .modal-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--color-border-primary);
        max-height: 200px;
    }

    .data-table-container {
        overflow-x: scroll;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 0.9375rem;
    }

    .login-box {
        padding: var(--spacing-lg);
    }

    .logo-container {
        width: 56px;
        height: 56px;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
    }

    .login-header h1 {
        font-size: var(--font-size-xl);
    }

    .message-avatar {
        width: 28px;
        height: 28px;
    }

    .message-avatar svg {
        width: 16px;
        height: 16px;
    }

    .modal {
        padding: var(--spacing-sm);
    }

    .modal-header,
    .modal-body {
        padding: var(--spacing-lg);
    }
}

/* ========================================
   MOBILE OVERLAY
   ======================================== */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    animation: fadeIn 0.2s ease-out;
}

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

@media (min-width: 769px) {
    .sidebar-overlay {
        display: none !important;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}