/* Universal selector: Resets default margin, padding, and sets box sizing */
/* Why?: Prevents browser defaults from messing up element alignment and sizes */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Page Body Styling */
/* What it does: Centers chat container box in middle of screen with dark gradient background */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e1e2f, #111119);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #ffffff;
}

/* Main Chat Container Window */
/* What it does: Sets fixed dimensions, background color, rounded corners, and shadow for container */
.chat-container {
    width: 90%;
    max-width: 500px;
    height: 600px;
    background-color: #252538;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Header Section Styling */
/* What it does: Styles title header bar at top of chat container */
.chat-header {
    background-color: #2f2f48;
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid #3b3b5c;
}

.chat-header h2 {
    font-size: 20px;
    color: #4da6ff;
    margin-bottom: 4px;
}

.chat-header p {
    font-size: 12px;
    color: #a0a0c0;
}

/* Chat Message Window Area */
/* What it does: Flex-1 takes all remaining vertical height, allows scrolling when messages overflow */
.chat-box {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Generic Message Row Container */
.message {
    display: flex;
    width: 100%;
}

/* Paragraph Text Inside Chat Bubbles */
/* What it does: Creates rounded message bubble box around text */
.message p {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.5;
    word-break: break-word;
}

/* User Message Alignment & Color (Blue background, aligned right) */
.message.user {
    justify-content: flex-end;
}

.message.user p {
    background-color: #007bff;
    color: #ffffff;
    border-bottom-right-radius: 2px;
}

/* Bot Message Alignment & Color (Dark grey background, aligned left) */
.message.bot {
    justify-content: flex-start;
}

.message.bot p {
    background-color: #383854;
    color: #e0e0e0;
    border-bottom-left-radius: 2px;
}

/* Input Area Row (Contains input field and send button) */
.input-container {
    display: flex;
    padding: 14px;
    background-color: #2f2f48;
    border-top: 1px solid #3b3b5c;
    gap: 10px;
}

/* Text Input Box Field */
.input-container input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #4a4a6e;
    border-radius: 24px;
    outline: none;
    background-color: #1e1e2f;
    color: #ffffff;
    font-size: 14px;
}

/* Input Placeholder Text Styling */
.input-container input::placeholder {
    color: #8888aa;
}

/* Send Button Styling */
.input-container button {
    padding: 12px 20px;
    background-color: #007bff;
    color: #ffffff;
    border: none;
    border-radius: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

/* Send Button Hover Effect */
.input-container button:hover {
    background-color: #0056b3;
}