:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #bb86fc;
    --secondary-color: #03dac6;
    --error-color: #cf6679;
    --text-color: #e0e0e0;
    --secondary-text-color: #a0a0a0;
    --user-message-bg: #2c2c2c;
    --assistant-message-bg: #383838;
    --input-bg: #2c2c2c;
    --border-color: #333;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    height: 100vh;
}

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

header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--user-message-bg);
    text-align: center;
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

header p {
    font-size: 0.9rem;
    color: var(--secondary-text-color);
    margin: 0;
}

#reset-button {
    background-color: transparent;
    border: 1px solid var(--error-color);
    color: var(--error-color);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s, color 0.2s;
}

#reset-button:hover {
    background-color: var(--error-color);
    color: var(--surface-color);
}

.chat-log {
    flex-grow: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    padding: 0.8rem 1rem;
    border-radius: 12px;
    max-width: 80%;
    line-height: 1.5;
    word-wrap: break-word;
    white-space: pre-wrap; 
}

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

.assistant-message {
    align-self: flex-start;
    background-color: var(--assistant-message-bg);
    border-bottom-left-radius: 2px;
    color: var(--text-color);
}

/* Анимация набора текста */
.typing-indicator span {
    display: inline-block;
    width: 8px;
    height: 8px;
    margin: 0 2px;
    background-color: var(--secondary-text-color);
    border-radius: 50%;
    animation: typing-bounce 1.4s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

.error-message {
    align-self: center;
    color: var(--error-color);
    font-style: italic;
    background-color: transparent;
}

.chat-form {
    display: flex;
    padding: 1rem;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    gap: 0.5rem;
}

textarea {
    flex-grow: 1;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.8rem;
    border-radius: 8px;
    resize: none;
    height: 50px;
    max-height: 150px;
    font-family: inherit;
    outline: none;
}

textarea:focus {
    border-color: var(--primary-color);
}

button[type="submit"] {
    background-color: var(--primary-color);
    color: #000;
    border: none;
    padding: 0 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}