static/styles.css

/* Cosmic Chatbot - Styles CSS */
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

:root {
    /* Dark Theme (Deep Space) */
    --dark-bg-primary: #0f0f1a;
    --dark-bg-secondary: #1a1a2e;
    --dark-accent-primary: #7b2cbf;
    --dark-accent-secondary: #c77dff;
    --dark-text-primary: #e6e6fa;
    --dark-text-secondary: #b8b8d4;
    --dark-border: #2a2a4a;
    --dark-shadow: rgba(123, 44, 191, 0.2);
    --dark-gradient: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
    --dark-card-bg: rgba(26, 26, 46, 0.7);
    --dark-input-bg: rgba(15, 15, 26, 0.6);
    
    /* Light Theme (Cosmic Nebula) */
    --light-bg-primary: #f0f8ff;
    --light-bg-secondary: #e6e6fa;
    --light-accent-primary: #7b2cbf;
    --light-accent-secondary: #5a189a;
    --light-text-primary: #1a1a2e;
    --light-text-secondary: #3a3a5a;
    --light-border: #d4d4f0;
    --light-shadow: rgba(123, 44, 191, 0.1);
    --light-gradient: linear-gradient(135deg, #f0f8ff 0%, #e6e6fa 100%);
    --light-card-bg: rgba(230, 230, 250, 0.7);
    --light-input-bg: rgba(240, 248, 255, 0.6);
    
    /* Default Theme (starts with dark) */
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --accent-primary: var(--dark-accent-primary);
    --accent-secondary: var(--dark-accent-secondary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --border: var(--dark-border);
    --shadow: var(--dark-shadow);
    --gradient: var(--dark-gradient);
    --card-bg: var(--dark-card-bg);
    --input-bg: var(--dark-input-bg);
    
    /* Animation Speeds */
    --animation-slow: 3s;
    --animation-medium: 1.5s;
    --animation-fast: 0.6s;
    
    /* Sizes */
    --border-radius-sm: 0.5rem;
    --border-radius-md: 1rem;
    --border-radius-lg: 1.5rem;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

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

body {
    font-family: 'Quicksand', sans-serif;
    background: var(--gradient);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    transition: all 0.5s ease;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(123, 44, 191, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 85% 85%, rgba(199, 125, 255, 0.1) 0%, transparent 20%);
    pointer-events: none;
    z-index: -1;
}

/* Stars Animation */
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.star {
    position: absolute;
    background-color: var(--text-primary);
    border-radius: 50%;
    opacity: 0;
    animation: twinkle var(--animation-slow) infinite ease-in-out;
}

@keyframes twinkle {
    0%, 100% { opacity: 0; transform: scale(0.5); }
    50% { opacity: 0.8; transform: scale(1); }
}

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

.particle {
    position: absolute;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    opacity: 0.3;
    filter: blur(3px);
    animation: float var(--animation-medium) infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-20px) translateX(10px); }
}

/* Main Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

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

.app-title h1 {
    font-weight: 700;
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px var(--shadow);
}

.app-logo {
    width: 40px;
    height: 40px;
    animation: pulse var(--animation-medium) infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.theme-toggle:hover {
    transform: rotate(30deg);
}

.feature-toggle {
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.feature-toggle:hover {
    background: var(--accent-primary);
    color: white;
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 10px 30px var(--shadow);
    backdrop-filter: blur(10px);
}

/* Messages Area */
.messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    scroll-behavior: smooth;
}

.messages::-webkit-scrollbar {
    width: 6px;
}

.messages::-webkit-scrollbar-track {
    background: transparent;
}

.messages::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 10px;
}

.message {
    max-width: 80%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    line-height: 1.6;
    animation: fadeIn var(--animation-fast) ease-out;
    position: relative;
    overflow: hidden;
}

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

.user-message {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border-top-right-radius: 4px;
}

.user-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
    pointer-events: none;
}

.bot-message {
    align-self: flex-start;
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
}

.message-time {
    font-size: 0.7rem;
    opacity: 0.7;
    margin-top: var(--spacing-xs);
    text-align: right;
}

.message-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    position: absolute;
    bottom: -10px;
    background: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: white;
}

.user-message .message-avatar {
    right: -10px;
}

.bot-message .message-avatar {
    left: -10px;
}

/* Code Block Styling */
.code-block {
    font-family: 'Space Mono', monospace;
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-sm) 0;
    position: relative;
    overflow-x: auto;
}

.code-block::before {
    content: 'Python';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-primary);
    color: white;
    font-size: 0.7rem;
    padding: 2px 8px;
    border-bottom-left-radius: var(--border-radius-sm);
}

.copy-code {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background: var(--accent-secondary);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 2px 6px;
    font-size: 0.7rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.code-block:hover .copy-code {
    opacity: 1;
}

/* Typing Indicator */
.typing {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    align-self: flex-start;
    background: var(--input-bg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: typing var(--animation-fast) 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 {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.6; }
    30% { transform: translateY(-5px); opacity: 1; }
}

/* Input Area */
.input-area {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    position: relative;
}

.input-area::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
}

#chatInput {
    flex: 1;
    border: 1px solid var(--border);
    background: var(--input-bg);
    color: var(--text-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    outline: none;
    font-family: 'Quicksand', sans-serif;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

#chatInput:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--shadow);
}

#chatInput::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

#fileInput {
    display: none;
}

.input-button {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.input-button:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.input-button i {
    font-size: 1.2rem;
}

.send-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    color: white;
}

/* Feature Showcase */
.feature-showcase {
    display: none;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border);
    box-shadow: 0 10px 30px var(--shadow);
    backdrop-filter: blur(10px);
}

.feature-showcase.active {
    display: block;
    animation: slideDown var(--animation-fast) ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px var(--shadow);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-primary);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* File Upload Preview */
.file-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--input-bg);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px dashed var(--border);
    animation: fadeIn var(--animation-fast) ease-out;
}

.file-preview-icon {
    font-size: 1.2rem;
    color: var(--accent-primary);
}

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

.file-preview-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.file-preview-remove:hover {
    color: #ff4d4d;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .message {
        max-width: 90%;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

/* Dark/Light Theme Transitions */
.theme-transition {
    transition: background 0.5s ease,
                color 0.5s ease,
                border-color 0.5s ease,
                box-shadow 0.5s ease;
}

/* Light Theme Class */
body.light-theme {
    --bg-primary: var(--light-bg-primary);
    --bg-secondary: var(--light-bg-secondary);
    --accent-primary: var(--light-accent-primary);
    --accent-secondary: var(--light-accent-secondary);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --border: var(--light-border);
    --shadow: var(--light-shadow);
    --gradient: var(--light-gradient);
    --card-bg: var(--light-card-bg);
    --input-bg: var(--light-input-bg);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Image Display */
.image-preview {
    max-width: 100%;
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-sm) 0;
}

/* Markdown Content */
.markdown-content {
    line-height: 1.6;
}

.markdown-content h1, 
.markdown-content h2, 
.markdown-content h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.markdown-content p {
    margin-bottom: var(--spacing-sm);
}

.markdown-content ul, 
.markdown-content ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.markdown-content a {
    color: var(--accent-primary);
    text-decoration: none;
}

.markdown-content a:hover {
    text-decoration: underline;
}

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 10;
    box-shadow: 0 2px 10px var(--shadow);
    border: 1px solid var(--border);
}

.tooltip:hover::after {
    opacity: 1;
}

/* Loading Spinner */
.loading-spinner {
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
    margin: 0 auto;
}

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