:root {
    --bg-color: #0a0a0a;
    --chat-bg: #1a1a1a;
    --text-color: #ffffff;
    --input-bg: #2a2a2a;
    --border-color: #333333;
    --accent-color: #10a37f;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.chat-container {
    max-width: 900px;
    margin: 0 auto;
    min-height: calc(100vh - 50px);
    display: flex;
    flex-direction: column;
    flex: 1;
    width: 100%;
    padding: 0 1rem;
    box-sizing: border-box;
}

.chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.chat-header h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-color);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.message {
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1rem;
}

.message-content {
    background: var(--chat-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    max-width: 80%;
}

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

.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

textarea {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-color);
    padding: 0.75rem;
    resize: none;
    outline: none;
    font-family: inherit;
}

button {
    background: var(--accent-color);
    border: none;
    border-radius: 0.5rem;
    color: white;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

.footer {
    text-align: center;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    color: #666;
    font-size: 0.9rem;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 2rem;
    background: var(--chat-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    width: 90%;
    box-sizing: border-box;
}