style.css

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

:root {
    --primary-color: #6366f1;
    --primary-hover: #5558e3;
    --background: #0f0f23;
    --surface: #1a1b3a;
    --surface-light: #252648;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #334155;
    --error: #ef4444;
    --success: #10b981;
    --user-bg: #4338ca;
    --assistant-bg: #1e293b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1a2e 100%);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    background: var(--surface);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.settings {
    position: relative;
}

.settings-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.2s;
}

.settings-btn:hover {
    background: var(--surface-light);
}

.settings-menu {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 0.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    min-width: 200px;
    z-index: 1000;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.settings-menu.hidden {
    display: none;
}

.device-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background 0.2s;
}

.device-toggle:hover {
    background: var(--surface-light);
}

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

.clear-btn {
    width: 100%;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

.clear-btn:hover:not(:disabled) {
    opacity: 0.9;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.welcome-message {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.welcome-message h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.message {
    display: flex;
    gap: 1rem;
    animation: fadeIn 0.3s ease-in;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

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

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

.message-content {
    background: var(--surface);
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    max-width: 70%;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.user-message .message-content {
    background: var(--user-bg);
    margin-left: auto;
}

.assistant-message .message-content {
    background: var(--surface-light);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
}

.input-container {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1rem 1.5rem;
}

.typing-indicator {
    display: flex;
    gap: 0.3rem;
    padding: 0.5rem 0;
}

.typing-indicator.hidden {
    display: none;
}

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

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

.chat-form {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
}

.message-input {
    flex: 1;
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
    line-height: 1.5;
    max-height: 120px;
}

.message-input:focus {
    border-color: var(--primary-color);
}

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

.send-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.send-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 35, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.loading-overlay.hidden {
    display: none;
}

.loader {
    text-align: center;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--surface-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1s linear infinite;
}

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

.loader p {
    color: var(--text-primary);
    margin: 0.5rem 0;
}

.loader-status {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.25rem;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .chat-container {
        padding: 1rem;
    }
    
    .input-container {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .message-content {
        max-width: 90%;
    }
    
    .message {
        gap: 0.5rem;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 1rem;
    }
}