:root {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --input-background: #1e1e1e;
    --border-color: #333333;
    --accent-color: #007bff;
    --message-bg-user: #333333;
    --message-bg-bot: #1e1e1e;
    --error-color: #cf6679;
}

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

.hidden {
    display: none !important;
}

.chat-container {
    width: 100%;
    max-width: 800px;
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.chat-messages {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    padding: 12px 18px;
    border-radius: 18px;
    max-width: 75%;
    word-wrap: break-word;
    align-self: flex-start;
}

.message-user {
    background-color: var(--message-bg-user);
    align-self: flex-end;
}

.message-bot {
    background-color: var(--message-bg-bot);
    border: 1px solid var(--border-color);
}

.message-bot-error {
    background-color: transparent;
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.welcome-message {
    align-self: center;
    background-color: #2a2a3a;
    color: #c7d2fe;
    text-align: center;
}

.chat-input-area {
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--input-background);
    border-radius: 25px;
    padding: 5px;
}

textarea#message-input {
    flex-grow: 1;
    border: none;
    background: transparent;
    padding: 10px;
    font-size: 16px;
    resize: none;
    height: 24px; /* Initial height for one line */
    max-height: 120px; /* Max height for about 5-6 lines */
    overflow-y: auto;
    font-family: inherit;
    color: var(--text-color);
}

textarea#message-input:focus {
    outline: none;
}

.attach-btn, .send-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: #a0a0a0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.attach-btn:hover, .send-btn:hover {
    color: var(--accent-color);
}

.send-btn {
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    width: 36px;
    height: 36px;
}
.send-btn:hover {
    opacity: 0.9;
    color: white;
}

/* Typing indicator styles */
.typing-dots span {
    animation-name: blink;
    animation-duration: 1.4s;
    animation-iteration-count: infinite;
    animation-fill-mode: both;
    font-size: 1.5rem;
    line-height: 1;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes blink {
    0% { opacity: .2; }
    20% { opacity: 1; }
    100% { opacity: .2; }
}