:root {
    --bg-color: #f4f4f9;
    --container-bg: #ffffff;
    --primary-color: #3b82f6;
    --text-color: #1f2937;
    --user-msg-bg: #e0f2fe;
    --ai-msg-bg: #f3f4f6;
    --border-color: #e5e7eb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    height: 100vh;
}

.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    background: var(--container-bg);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.25rem;
    margin: 0;
}

.api-key-container {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.api-key-container input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    min-width: 200px;
}

#model-id {
    min-width: 250px;
}

.api-key-container button {
    padding: 0.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
}

main {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message {
    max-width: 85%;
    padding: 1rem;
    border-radius: 0.75rem;
    line-height: 1.5;
    position: relative;
}

.user-message {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    border-bottom-right-radius: 0;
}

.ai-message {
    align-self: flex-start;
    background-color: var(--ai-msg-bg);
    border-bottom-left-radius: 0;
}

.message pre {
    background: #1e293b;
    color: #f8fafc;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.message code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
}

.input-area {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

textarea {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    resize: none;
    font-size: 1rem;
    max-height: 200px;
}

#send-btn {
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
}

.disclaimer {
    font-size: 0.75rem;
    color: #6b7280;
    text-align: center;
    margin-top: 0.75rem;
}

.welcome-message {
    text-align: center;
    margin-top: 5rem;
    color: #6b7280;
}