:root {
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --accent: #38bdf8;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --user-msg: #334155;
    --ai-msg: #1e293b;
}

body {
    background-color: var(--primary-bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin: 0;
    display: flex;
    height: 100vh;
}

.chat-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    height: 100%;
}

.messages-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    padding: 12px 18px;
    border-radius: 12px;
    max-width: 80%;
    line-height: 1.5;
}

.message.user {
    align-self: flex-end;
    background-color: var(--user-msg);
    border-bottom-right-radius: 2px;
}

.message.ai {
    align-self: flex-start;
    background-color: var(--ai-msg);
    border-bottom-left-radius: 2px;
    border: 1px solid var(--border);
}

.input-area {
    margin-top: 20px;
    display: flex;
    gap: 10px;
    background: var(--secondary-bg);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text);
    resize: none;
    outline: none;
    font-size: 16px;
}

button {
    background: var(--accent);
    color: var(--primary-bg);
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s;
}

button:active {
    transform: scale(0.95);
}

.settings-container {
    padding: 40px;
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
}

input {
    width: 100%;
    background: var(--secondary-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px;
    border-radius: 6px;
}