html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden; /* Prevents horizontal scroll/space */
}
body {
    font-family: 'Segoe UI', 'Inter', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}
#main-container {
    height: 100vh; /* Fallback for older browsers */
    height: calc(var(--vh, 1vh) * 100);
}
.interest-bubble {
    position: relative;
    display: inline-block;
    background-color: #E7F3FF;
    color: #1877F2;
    border-radius: 16px;
    padding: 8px 28px 8px 16px;
    margin: 4px;
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
}
.interest-bubble button {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    background-color: #1877F2;
    color: white;
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease-in-out;
}
.interest-bubble button:hover {
    transform: scale(1.1);
}
#messages-container {
     scrollbar-width: thin;
     scrollbar-color: #d1d5db #F0F2F5;
}
.chat-bg {
    background-color: #F0F2F5;
}
/* Typing indicator styles */
.typing-indicator span {
    height: 8px;
    width: 8px;
    background-color: #9ca3af;
    border-radius: 50%;
    display: inline-block;
    animation: 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 bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

/* Dark Mode Styles */
.dark body { background-color: #1c1e21; color: #e4e6eb; }
.dark #main-container { background-color: #242526; box-shadow: 0 0 15px rgba(0,0,0,0.5); }
.dark .text-blue-600 { color: #4b9cff; }
.dark #online-counter, .dark .header-bar { background-color: #3a3b3c; border-color: #4e4f50; }
.dark .text-gray-800 { color: #e4e6eb; }
.dark .text-gray-600, .dark .text-gray-500 { color: #b0b3b8; }
.dark .text-gray-700 { color: #dadde1; }
.dark #interest-input { background-color: #3a3b3c; border-color: #4e4f50; color: #e4e6eb; }
.dark .interest-bubble { background-color: #2d88ff; color: white; }
.dark .interest-bubble button { background-color: #fff; color: #2d88ff; }
.dark .chat-bg { background-color: #18191a; }
.dark #messages-container { scrollbar-color: #4e4f50 #18191a; }
.dark #chat-screen .border-gray-200 { border-color: #3e4042; }
.dark #chat-screen .bg-white { background-color: #242526; }
.dark #message-input { background-color: #3a3b3c; border-color: #4e4f50; }
.dark .bg-gray-200 { background-color: #3a3b3c; }
/* .dark .text-gray-700 { color: #e4e6eb; } */
.dark .bg-gray-100 { background-color: #1c1e21; }
.dark aside { background-color: #1c1e21; }
.dark aside div { background-color: #1c1e21; }
.dark #startup-prompt { background-color: rgba(10,10,10,0.7); }
.dark .bg-gray-200.text-gray-700 {
    color: #e4e6eb;
}