:root {
    --bg-color: #0f172a;
    --chat-bg: #1e293b;
    --text-color: #f8fafc;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --msg-user: #3b82f6;
    --msg-ai: #334155;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: var(--chat-bg);
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #334155;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-circle {
    width: 20px;
    height: 20px;
    background-color: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent);
}

.status {
    display: flex;
    align-items: center;
    font-size: 0.9em;
    color: #94a3b8;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
    margin-right: 8px;
}

.chat-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 12px;
    line-height: 1.5;
}

.system-message {
    align-self: center;
    background-color: transparent;
    color: #94a3b8;
    font-size: 0.9em;
    text-align: center;
    border: 1px solid #334155;
}

.user-message {
    align-self: flex-end;
    background-color: var(--msg-user);
    border-bottom-right-radius: 4px;
}

.ai-message {
    align-self: flex-start;
    background-color: var(--msg-ai);
    border-bottom-left-radius: 4px;
}

.input-area {
    padding: 20px;
    display: flex;
    gap: 10px;
    border-top: 1px solid #334155;
}

input[type="text"] {
    flex-grow: 1;
    background-color: #0f172a;
    border: 1px solid #334155;
    border-radius: 24px;
    padding: 12px 20px;
    color: var(--text-color);
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    border-color: var(--accent);
}

button {
    background-color: var(--accent);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--accent-hover);
}