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

:root {
    --color-primary: #3b82f6;
    --color-primary-light: #93c5fd;
    --color-primary-dark: #1d4ed8;
    --color-background: #f8fafc;
    --color-card: #ffffff;
    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-border: #e2e8f0;
    --color-error: #ef4444;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.chat-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 800px;
    height: 90vh;
    background-color: var(--color-card);
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.chat-header {
    background-color: var(--color-card);
    padding: 20px;
    border-bottom: 1px solid var(--color-border);
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message-container {
    display: flex;
    flex-direction: column;
    max-width: 80%;
    gap: 2px;
}

.message {
    padding: 14px 18px;
    border-radius: 16px;
    font-size: 16px;
    line-height: 1.6;
    word-break: break-word;
    white-space: pre-line;
}

.user-message {
    background-color: var(--color-primary);
    color: white;
    border-radius: 16px 16px 0 16px;
    align-self: flex-end;
    margin-left: auto;
}

.system-message {
    background-color: #f1f5f9;
    color: var(--color-text);
    border-radius: 16px 16px 16px 0;
}

.chat-input-container {
    padding: 20px;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-card);
}

.chat-form {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: #f1f5f9;
    border-radius: 30px;
    padding: 6px 6px 6px 20px;
    border: 1px solid var(--color-border);
}

.chat-input {
    flex: 1;
    padding: 12px 0;
    background-color: transparent;
    border: none;
    font-size: 16px;
    color: var(--color-text);
    outline: none;
}

.chat-input::placeholder {
    color: var(--color-text-secondary);
}

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

.send-button svg {
    width: 18px;
    height: 18px;
}

.send-button:hover {
    background-color: var(--color-primary-dark);
}

.send-button:disabled {
    background-color: var(--color-primary-light);
    cursor: not-allowed;
}

.select-generation-model {
    background-color: var(--color-primary);
    color: white;
    border-radius: 30px;
    border: 10px solid var(--color-primary);
    height: 44px;
    font-size: 16px;
    outline: none;
    transition: all 0.2s ease;
}

.select-generation-model:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    cursor: pointer;
}

.select-generation-model:focus-visible {
    outline: none;
}

.select-generation-model:disabled {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    cursor: not-allowed;
}

.select-generation-model>option {
    background-color: var(--color-primary);
}

.loading {
    color: var(--color-text-secondary);
    font-style: italic;
}

.error {
    color: var(--color-error);
}

@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
        border-radius: 0;
    }

    body {
        padding: 0;
    }
}

@media (max-width: 480px) {
    .chat-messages {
        padding: 16px;
    }

    .message-container {
        max-width: 90%;
    }

    h1 {
        font-size: 1.5rem;
    }

    .chat-input-container {
        padding: 12px;
    }
}