/* =============================================================================
   AI BRAIN - Purple/Blue Theme
   Main stylesheet for chat interface and authentication pages
   ============================================================================= */

/* -----------------------------------------------------------------------------
   CSS Variables (Theme Colors)
   ----------------------------------------------------------------------------- */
:root {
    /* Purple/Blue Gradient Colors */
    --primary-purple: #667eea;
    --primary-purple-dark: #764ba2;
    --primary-purple-light: #f093fb;
    --primary-blue: #00bfff;

    /* Background Colors */
    --bg-dark: #0a0a0f;
    --bg-darker: #050508;
    --bg-card: rgba(20, 20, 30, 0.8);
    --bg-hover: rgba(102, 126, 234, 0.1);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #606080;

    /* Border Colors */
    --border-color: rgba(102, 126, 234, 0.2);
    --border-focus: rgba(102, 126, 234, 0.5);

    /* Shadow Colors */
    --shadow-purple: rgba(138, 43, 226, 0.3);
    --shadow-blue: rgba(0, 191, 255, 0.3);

    /* Status Colors */
    --success: #4ade80;
    --error: #ef4444;
    --warning: #f59e0b;

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

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

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-sm);
}

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

/* -----------------------------------------------------------------------------
   Background Particles Canvas
   ----------------------------------------------------------------------------- */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* -----------------------------------------------------------------------------
   Authentication Pages
   ----------------------------------------------------------------------------- */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    overflow: auto;
}

.auth-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 450px;
    padding: var(--spacing-xl);
}

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

.logo-text {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-purple-dark) 50%, var(--primary-purple-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 4px;
    margin-bottom: var(--spacing-sm);
    animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% {
        filter: brightness(1) drop-shadow(0 0 20px var(--shadow-purple));
    }
    50% {
        filter: brightness(1.3) drop-shadow(0 0 40px var(--shadow-purple));
    }
}

.logo-tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
}

.auth-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px var(--shadow-purple);
}

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.auth-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.auth-form {
    width: 100%;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--border-focus);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-muted);
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    color: var(--text-primary);
    box-shadow: 0 4px 12px var(--shadow-purple);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-purple);
}

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

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-focus);
}

.btn-block {
    width: 100%;
}

.btn-loader {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Links */
.link {
    color: var(--primary-purple-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.link:hover {
    color: var(--primary-purple);
    text-decoration: underline;
}

/* Dividers */
.auth-divider {
    position: relative;
    text-align: center;
    margin: var(--spacing-xl) 0;
    color: var(--text-muted);
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
    z-index: 0;
}

.auth-divider span {
    position: relative;
    padding: 0 var(--spacing-md);
    background: var(--bg-card);
    z-index: 1;
}

/* Alerts */
.auth-error,
.auth-success {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    font-size: 0.875rem;
}

.auth-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

.auth-success {
    background: rgba(74, 222, 128, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

/* -----------------------------------------------------------------------------
   Chat Page Layout
   ----------------------------------------------------------------------------- */
.chat-page {
    overflow: hidden;
}

.chat-container {
    display: flex;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

/* -----------------------------------------------------------------------------
   Sidebar
   ----------------------------------------------------------------------------- */
.sidebar {
    width: 300px;
    background: var(--bg-darker);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

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

.logo-small {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text-small {
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-icon,
.btn-icon-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.btn-icon {
    width: 36px;
    height: 36px;
}

.btn-icon-small {
    width: 28px;
    height: 28px;
}

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

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

.conversations-section {
    flex: 1;
    overflow-y: auto;
    border-bottom: none;
}

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

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

/* Project Filter */
.project-filter {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 0.875rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

/* Projects List */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.project-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    padding-right: 2.5rem;
    transition: all var(--transition-fast);
}

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

.project-item.active {
    background: var(--bg-hover);
    border-left: 3px solid var(--primary-purple);
}

.project-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.project-name {
    flex: 1;
    font-size: 0.875rem;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.project-count {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Conversations List */
.conversations-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.conversation-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    padding-right: 2.5rem;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

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

.conversation-item.active {
    background: var(--bg-hover);
    border-left-color: var(--primary-purple);
}

.conversation-title {
    font-size: 0.875rem;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.conversation-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Loading Placeholder */
.loading-placeholder {
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

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

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.user-details {
    flex: 1;
    overflow: hidden;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-email {
    font-size: 0.75rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Continue in next part... */

/* -----------------------------------------------------------------------------
   Chat Main Area
   ----------------------------------------------------------------------------- */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.mobile-menu-btn {
    display: none;
}

.chat-title h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.chat-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
}

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

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

.messages-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.welcome-message h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.welcome-message p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Message Bubble */
.message {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background: var(--bg-card);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
}

.message-content {
    flex: 1;
    max-width: 100%;
}

.message-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.message-role {
    font-weight: 600;
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.message-text {
    font-size: 0.9375rem;
    line-height: 1.6;
    word-wrap: break-word;
}

/* Markdown Content Styling */
.message-text h1,
.message-text h2,
.message-text h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.message-text code {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.875em;
}

.message-text pre {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

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

.message-text ul,
.message-text ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.message-text blockquote {
    border-left: 3px solid var(--primary-purple);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--text-secondary);
}

/* Typing Indicator */
.typing-indicator {
    display: inline-flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-10px);
    }
}

/* Input Container */
.input-container {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-darker);
}

.input-form {
    max-width: 900px;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.input-wrapper:focus-within {
    border-color: var(--border-focus);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#messageInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    overflow-y: auto;
}

#messageInput:focus {
    outline: none;
}

#messageInput::placeholder {
    color: var(--text-muted);
}

.btn-send {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--shadow-purple);
}

.btn-send:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 500px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px var(--shadow-purple);
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

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

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

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

.color-picker input[type="color"] {
    width: 60px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.color-picker input[type="text"] {
    flex: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
    }

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

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

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

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

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

    .logo-text {
        font-size: 2rem;
    }

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

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

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

.text-success {
    color: var(--success);
}

/* Context Menu Styles */
.context-menu {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    min-width: 200px;
    z-index: 1000;
    animation: fadeIn 0.15s ease;
    backdrop-filter: blur(10px);
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.context-menu-item:hover {
    background: var(--bg-hover);
}

.context-menu-item.danger {
    color: var(--error);
}

.context-menu-item.danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

.context-icon {
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.context-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.25rem 0;
}

.conv-menu-btn,
.proj-menu-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    line-height: 1;
    transition: all var(--transition-fast);
}

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

.conversation-item:hover .conv-menu-btn,
.project-item:hover .proj-menu-btn {
    display: inline-flex;
}

.share-link-box {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.share-link-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.share-link-input:focus {
    outline: none;
    border-color: var(--border-focus);
}

.project-select-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 400px;
    overflow-y: auto;
}

.project-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.project-option:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.project-color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.color-swatch {
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: 3px solid transparent;
    transition: all var(--transition-fast);
}

.color-swatch:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.color-swatch.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 1px var(--bg-dark), 0 0 0 4px var(--text-primary);
}

/* =============================================================================
   Toast Notifications
   ============================================================================= */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
    font-size: 14px;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease;
    pointer-events: auto;
    max-width: 350px;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-icon {
    font-size: 16px;
}

.toast-message {
    flex: 1;
}

.toast-success {
    border-color: var(--success);
    background: rgba(74, 222, 128, 0.1);
}

.toast-error {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.toast-info {
    border-color: var(--primary-purple);
    background: rgba(102, 126, 234, 0.1);
}

/* =============================================================================
   Loading Placeholder Animation
   ============================================================================= */
.loading-placeholder {
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* =============================================================================
   Typing Indicator
   ============================================================================= */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-purple);
    animation: typing-bounce 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 typing-bounce {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}