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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #0f0f0f;
    --chat-bg: #1a1a1a;
    --user-msg-bg: #2d2d2d;
    --ai-msg-bg: #252525;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --border-color: #3f3f46;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --spinner-size: 24px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Header Styles */
.app-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-shrink: 0;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.attribution-link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.attribution-link:hover {
    color: var(--primary-color);
}

/* Model Status */
.model-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--user-msg-bg);
    border-radius: 99px;
    font-size: 0.875rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--error-color);
    animation: pulse 2s infinite;
}

.status-dot.loading {
    background-color: var(--success-color);
}

.status-dot.ready {
    background-color: var(--success-color);
    animation: none;
}

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

.status-text {
    color: var(--text-secondary);
}

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

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.welcome-screen h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.welcome-screen > p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.example-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.example-prompts {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.example-btn {
    background-color: var(--user-msg-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
    text-align: left;
}

.example-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Messages */
.messages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 2rem;
}

.message {
    display: flex;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
    animation: fadeIn 0.3s ease;
}

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

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.25rem;
}

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

.message.ai .message-avatar {
    background-color: var(--success-color);
}

.message-content {
    background-color: var(--ai-msg-bg);
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    line-height: 1.6;
    max-width: calc(100% - 60px);
    word-wrap: break-word;
}

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

/* Code Blocks */
.message-content pre {
    background-color: #111;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 0.5rem 0;
    font-family: 'Fira Code', 'Monaco', monospace;
    font-size: 0.875rem;
}

.message-content code {
    font-family: 'Fira Code', 'Monaco', monospace;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
}

.message-content pre code {
    background-color: transparent;
    padding: 0;
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.spinner {
    width: var(--spinner-size);
    height: var(--spinner-size);
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    display: flex;
    gap: 0.25rem;
}

.loading-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(1) { animation-delay: -0.32s; }
.loading-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.loading-indicator p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.progress-bar {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* Input Area */
.input-area {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    flex-shrink: 0;
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: 0.75rem;
    position: relative;
}

#user-input {
    flex: 1;
    background-color: var(--user-msg-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    min-height: 48px;
    max-height: 200px;
    font-family: inherit;
    transition: border-color 0.2s;
}

#user-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

#user-input::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    width: 48px;
    height: 48px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.75rem;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.send-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.send-btn svg {
    width: 20px;
    height: 20px;
}

.disclaimer {
    text-align: center;
    padding-top: 0.5rem;
}

.disclaimer p {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* Scrollbar Styling */
.chat-container::-webkit-scrollbar,
.messages-list::-webkit-scrollbar {
    width: 8px;
}

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

.chat-container::-webkit-scrollbar-thumb,
.messages-list::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover,
.messages-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        align-items: center;
    }
    
    .message {
        max-width: 100%;
    }
    
    .message-content {
        max-width: calc(100% - 50px);
    }
    
    .example-btn {
        text-align: center;
    }
}

/* Typing cursor */
.typing-cursor::after {
    content: '▋';
    animation: blink 1s step-start infinite;
    margin-left: 2px;
}

@keyframes blink {
    50% { opacity: 0; }
}