/* ============================================
   DREXET AI - Main Stylesheet
   Modern AI Interface Design
   ============================================ */

/* App Name Header */
.app-name-header {
    position: fixed;
    top: 0;
    left: 70px;
    right: 0;
    height: 60px;
    background-color: var(--bg-primary);
    border-bottom: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: var(--z-sticky);
    backdrop-filter: blur(10px);
    transition: left var(--transition-base);
}

[data-theme="light"] .app-name-header {
    background-color: rgba(255, 255, 255, 0.8);
}

body:has(.app-container.sidebar-collapsed) .app-name-header,
.app-name-header.sidebar-collapsed {
    left: 0;
}

[data-theme="dark"] .app-name-header {
    background-color: var(--bg-primary);
}

.app-header-right {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.app-title-image {
    height: 32px;
    width: auto;
    object-fit: contain;
    animation: fadeIn 0.5s ease-out;
    transition: opacity var(--transition-base);
}

/* CSS Variables - Theme System */
:root {
    /* Colors - Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-tertiary: #ececf1;
    --bg-hover: #f0f0f0;
    --bg-active: #e5e5e5;
    
    --text-primary: #353740;
    --text-secondary: #6e6e80;
    --text-tertiary: #8e8ea0;
    --text-inverse: #ffffff;
    
    --border-color: #e5e5e6;
    --border-hover: #d1d1d6;
    
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-hover: #5568d3;
    --accent-active: #4a5bc4;
    
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    --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);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 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: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 60px;
    --header-height: 60px;
    --input-area-height: 200px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 900;
    --z-modal: 1000;
    --z-toast: 1100;
}

/* Dark Theme - Enhanced for WCAG AA contrast compliance */
[data-theme="dark"] {
    --bg-primary: #171717;
    --bg-secondary: #1f1f1f;
    --bg-tertiary: #2a2a2a;
    --bg-hover: #252525;
    --bg-active: #303030;
    
    /* Enhanced text colors for better contrast (WCAG AA: 4.5:1 for normal text, 3:1 for large text) */
    --text-primary: #f0f0f0;      /* Improved from #ececf1 for better contrast */
    --text-secondary: #d0d0d0;      /* Improved from #c5c5d2 for better contrast */
    --text-tertiary: #b0b0b0;      /* Improved from #8e8ea0 for better contrast */
    --text-inverse: #171717;
    
    --border-color: #2d2d2d;
    --border-hover: #3a3a3a;
    
    --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, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Loading Screen - DISABLED */
.loading-screen {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
}

.loading-screen.hidden {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    margin-bottom: var(--spacing-lg);
}

.loading-logo svg {
    color: white;
}

.loading-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.loading-content p {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
    padding-left: 70px;
    padding-top: 60px;
    transition: padding-left var(--transition-base);
    /* Ensure stable layout container */
    position: relative;
}

.app-container.sidebar-collapsed {
    padding-left: 0;
}

.app-container.sidebar-hidden {
    padding-left: 0;
}

.sidebar-logo {
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

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

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

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

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

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

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

.nav-group {
    display: flex;
    flex-direction: column;
}

.nav-submenu {
    display: flex;
    flex-direction: column;
    padding-left: 2.5rem;
    margin-top: var(--spacing-xs);
    gap: var(--spacing-xs);
}

.nav-subitem {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: var(--font-size-xs);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

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


.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.sidebar-section-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

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

.chat-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    position: relative;
}

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

.chat-item.active {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
}

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

.chat-item-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.chat-item:hover .chat-item-actions {
    opacity: 1;
}

.chat-item-action-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-item-action-btn:hover {
    background-color: var(--bg-active);
    color: var(--text-primary);
}

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

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-base);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    appearance: none;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background-color var(--transition-base);
}

.toggle-switch:checked {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
}

.toggle-switch::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    top: 2px;
    left: 2px;
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.toggle-switch:checked::before {
    transform: translateX(20px);
}

.model-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background-color: var(--bg-tertiary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-tertiary);
}

.status-indicator.online {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-indicator.offline {
    background-color: var(--error);
}

.model-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.stat-label {
    color: var(--text-tertiary);
}

.stat-value {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

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

.user-profile {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    flex-shrink: 0;
}

.collapse-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: var(--bg-primary);
    position: relative;
    width: 100%;
    align-items: center;
    justify-content: flex-start;
    /* Ensure stable positioning */
    min-width: 0;
    /* Fixed container to prevent layout shifts */
    max-width: 100vw;
}

/* Stable Chat Wrapper - Centered like Grok */
.chat-wrapper {
    width: 100%;
    max-width: 768px;
    margin: 0 auto;
    position: relative;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    /* Perfect centering that never moves */
    align-self: center;
}

.main-header {
    height: var(--header-height);
    padding: 0 var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.privacy-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
}

.privacy-indicator svg {
    color: var(--text-tertiary);
}

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

.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.app-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-right {
    display: flex;
    align-items: center;
}

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

.header-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

/* Chat Container - Stable and Centered */
.chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 0;
    width: 100%;
    max-width: 768px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    /* Prevent any transitions that might cause movement */
    transition: none !important;
    /* Ensure welcome screen is contained within */
    min-height: 100%;
    /* Smooth scrolling */
    scroll-behavior: smooth;
}

/* Custom scrollbar for chat container */
.chat-container::-webkit-scrollbar {
    width: 6px;
}

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

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

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.welcome-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-2xl);
    pointer-events: none;
    animation: fadeIn 0.5s ease-out;
    z-index: 1;
    /* Aligned with chat container */
    width: 100%;
    max-width: 768px;
    margin: 0 auto;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.welcome-screen.hidden {
    display: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

.welcome-content {
    max-width: 768px;
    width: 100%;
    text-align: center;
    /* Center content aligned with chat window */
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.main-logo-text {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin: 0 0 var(--spacing-md) 0;
    animation: fadeInUp 0.6s ease-out;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin: 0;
    animation: fadeInUp 0.8s ease-out;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.quick-action-btn {
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--text-secondary);
}

.quick-action-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.quick-action-btn svg {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.quick-action-btn span {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

/* Messages */
.messages-container {
    display: none;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 2;
    /* Ensure proper centering */
    align-self: center;
}

.messages-container.has-messages {
    display: flex !important;
}

.message {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    animation: messageSlideIn var(--transition-base) ease-out;
}

.message.user {
    background-color: var(--bg-secondary);
    margin-left: auto;
    max-width: 85%;
}

.message.assistant {
    background-color: var(--bg-secondary);
    margin-right: auto;
    max-width: 85%;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-text {
    color: var(--text-primary);
    line-height: var(--line-height-relaxed);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-text code {
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message-text pre {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.message-text pre code {
    background: none;
    padding: 0;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.message-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.message:hover .message-actions {
    opacity: 1;
}

.message-action-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.message-action-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    max-width: 85%;
    margin-right: auto;
    margin-top: var(--spacing-lg);
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-tertiary);
    animation: typingDot 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

.typing-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
}

/* Input Area */
.input-area {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.input-area.centered {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    bottom: auto;
    padding: 0;
    max-width: 700px;
    width: calc(100% - 4rem);
}

.input-area.centered .input-wrapper {
    box-shadow: var(--shadow-lg);
}

.model-selector-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    justify-content: flex-end;
}

.model-selector-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.model-selector-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-hover);
}

.model-name {
    color: var(--text-primary);
}

.dropdown-icon {
    color: var(--text-tertiary);
    transition: transform var(--transition-base);
}

.model-selector-btn:hover .dropdown-icon {
    transform: translateY(2px);
}

.voice-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.action-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.action-btn svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.action-btn:hover svg {
    color: var(--text-primary);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

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

.tiny-icon-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    padding: 0;
}

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

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-action-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

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

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--text-primary);
    min-height: 48px;
    max-height: 300px;
    overflow-y: auto;
    padding: var(--spacing-sm) 0;
}

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

.send-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.input-options {
    display: flex;
    gap: var(--spacing-sm);
}

.options-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.char-count {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Advanced Options Panel */
.advanced-options-panel {
    max-width: 800px;
    margin: var(--spacing-md) auto 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: none;
}

.advanced-options-panel.active {
    display: block;
    animation: slideDown var(--transition-base) ease-out;
}

.options-content h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.option-item label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.slider-value {
    min-width: 50px;
    text-align: right;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
}

.reset-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-lg);
    animation: fadeIn var(--transition-base) ease-out;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    animation: modalSlideUp var(--transition-base) ease-out;
}

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

.modal-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.settings-section .setting-item {
    margin-bottom: var(--spacing-md);
}

.settings-section select,
.settings-section input[type="text"],
.settings-section input[type="number"] {
    width: 200px;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    transition: all var(--transition-base);
}

.settings-section select:focus,
.settings-section input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.help-section {
    margin-bottom: var(--spacing-xl);
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.help-section p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.help-section ul {
    list-style: none;
    padding: 0;
}

.help-section li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

.help-section li strong {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.help-section kbd {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.125rem 0.375rem;
    font-family: 'Courier New', monospace;
    font-size: 0.875em;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-hover);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: toastSlideIn var(--transition-base) ease-out;
    min-width: 300px;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--info);
}

.toast-content {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.toast-close {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Selection */
::selection {
    background-color: var(--accent-primary);
 color: white;
}

/* Focus Styles */
*:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}