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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #343541;
    color: #ececf1;
    height: 100vh;
    overflow: hidden;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #444654;
    background-color: #343541;
}

.chat-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.clear-btn {
    padding: 8px 16px;
    background-color: #444654;
    color: #ececf1;
    border: 1px solid #565869;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.clear-btn:hover {
    background-color: #565869;
}

.persona-container {
    padding: 15px 20px;
    background-color: #40414f;
    border-bottom: 1px solid #444654;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.persona-container label {
    font-size: 14px;
    font-weight: 600;
    color: #ececf1;
}

#personaInput {
    width: 100%;
    background-color: #343541;
    border: 1px solid #565869;
    border-radius: 6px;
    color: #ececf1;
    font-size: 14px;
    padding: 10px;
    resize: vertical;
    outline: none;
    font-family: inherit;
    min-height: 60px;
}

#personaInput:focus {
    border-color: #19c37d;
}

#personaInput::placeholder {
    color: #8e8ea0;
}

.save-persona-btn {
    align-self: flex-end;
    padding: 8px 16px;
    background-color: #19c37d;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.2s;
}

.save-persona-btn:hover {
    background-color: #1aa56a;
}

.save-persona-btn:active {
    background-color: #178f5a;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    scroll-behavior: smooth;
}

.welcome-message {
    text-align: center;
    color: #8e8ea0;
    padding: 40px 20px;
    font-size: 16px;
}

.message {
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-header {
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-message .message-header {
    color: #19c37d;
}

.assistant-message {
    background-color: #444654;
    padding: 16px;
    border-radius: 8px;
}

.assistant-message .message-header {
    color: #9d70ec;
}

.message-content {
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.user-message .message-content {
    color: #ececf1;
}

.loading {
    display: flex;
    gap: 4px;
    padding: 16px;
}

.loading-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #8e8ea0;
    animation: bounce 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

.chat-input-container {
    padding: 20px;
    background-color: #343541;
    border-top: 1px solid #444654;
}

#chatForm {
    display: flex;
    gap: 12px;
    background-color: #40414f;
    border-radius: 12px;
    padding: 12px;
    border: 1px solid #565869;
}

#messageInput {
    flex: 1;
    background-color: transparent;
    border: none;
    color: #ececf1;
    font-size: 16px;
    resize: none;
    outline: none;
    font-family: inherit;
    max-height: 200px;
}

#messageInput::placeholder {
    color: #8e8ea0;
}

#sendBtn {
    background-color: #19c37d;
    border: none;
    border-radius: 8px;
    color: white;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

#sendBtn:hover:not(:disabled) {
    background-color: #1aa56a;
}

#sendBtn:disabled {
    background-color: #565869;
    cursor: not-allowed;
    opacity: 0.5;
}

.error-message {
    background-color: #ef4444;
    color: white;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #343541;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #565869;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #6e6e80;
}