body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f6f7f9;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 700px;
    margin: 40px auto;
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

h1 {
    margin: 0;
    font-size: 1.8rem;
}


.chat {
    margin-top: 20px;
    min-height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.message {
    margin: 12px 0;
    padding: 10px 14px;
    border-radius: 10px;
    line-height: 1.4;
}

.message.bot.thinking {
    font-style: italic;
    opacity: 0.7;
}

.user {
    background: #e6f0ff;
    align-self: flex-end;
}

.bot {
    background: #f1f1f1;
}

.message.bot,
.message.bot p,
.message.bot ul,
.message.bot ol,
.message.bot li {
    background: #fff7ec;
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    border-radius: 6px;
    font-family: Georgia, serif;
    margin: 0 0 0.6em 0;
}

.message.bot p:last-child {
    margin-bottom: 0;
}

form {
    display: flex;
    margin-top: 16px;
    gap: 10px;
}

input[type="text"] {
    flex: 1;
    padding: 12px;
    font-size: 1rem;
    border-radius: 8px;
    border: 1px solid #ccc;
}

button {
    padding: 12px 18px;
    font-size: 1rem;
    border-radius: 8px;
    border: none;
    background: #3b82f6;
    color: white;
    cursor: pointer;
}

button:disabled {
    background: #aaa;
}

.back-link {
    position: fixed;
    top: 16px;
    left: 16px;
    text-decoration: none;
    font-size: 0.95rem;
    color: #3b82f6;
    background: white;
    padding: 8px 12px;
    border-radius: 999px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    font-weight: 500;
    transition: background 0.15s ease, transform 0.1s ease;
    z-index: 1000;
}

.back-link:hover {
    background: #eef4ff;
    transform: translateX(-2px);
}