/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0d0d0e 20%, #1c3b75 100%);
    height: 100vh;
    overflow: hidden;
}

/* Login Container */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #0d0d0e 30%, #1c3b75 100%);
}

.login-form {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    text-align: center;
    min-width: 400px;
}

.login-form h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 2.5em;
    font-weight: 700;
}

.login-form p {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1em;
}

.login-form input {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.login-form input:focus {
    outline: none;
    border-color: #667eea;
}

.login-form button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #191a1b 40%, #a2a2a6 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
    margin-top: 20px;
}

.login-form button:hover {
    transform: translateY(-2px);
}

/* Chat Container - Fixed Layout like WhatsApp */
.chat-container {
    display: none;
    flex-direction: column;
    height: 100vh;
    background: #f0f0f0;
}

/* Chat Header - Fixed at top */
.chat-header {
    background: linear-gradient(135deg,#0d0d0e 40%, #1c3b75 100%);
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.chat-header h2 {
    margin: 0;
    font-size: 1.2em;
}

.leave-btn {
    background: #901212;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s ease;
}

.leave-btn:hover {
    background: #c43737;
}

/* Chat Body - Flexible area */
.chat-body {
    flex: 1;
    display: flex;
    min-height: 0; /* Important for flex scrolling */
}

/* Messages Area - Scrollable */
.messages-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #e5ddd5;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="chat-bg" patternUnits="userSpaceOnUse" width="100" height="100"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23chat-bg)"/></svg>');
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
.messages::-webkit-scrollbar {
    width: 6px;
}

.messages::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

.messages::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.5);
}

/* Message Styles */
.message {
    margin-bottom: 15px;
    max-width: 70%;
    word-wrap: break-word;
}

.message.own-message {
    align-self: flex-end;
    margin-left: auto;
}

.message.own-message .message-content {
    background: #ffffff;
    margin-left: auto;
}

.message.system-message {
    align-self: center;
    max-width: 80%;
}

.message.system-message .message-content {
    background: #fff3cd;
    color: #856404;
    text-align: center;
    font-style: italic;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 14px;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.message-username {
    font-weight: 600;
    color: #075e54;
    font-size: 14px;
}

.message-time {
    font-size: 12px;
    color: #999;
}

.message-content {
    background: white;
    padding: 10px 15px;
    border-radius: 18px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    font-size: 14px;
    line-height: 1.4;
    word-wrap: break-word;
    white-space: pre-wrap;
}

/* Users Sidebar */
.users-sidebar {
    width: 250px;
    background: white;
    border-left: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
}

.users-sidebar h3 {
    background: linear-gradient(135deg, #0d0d0e 10%, #1c3b75 100%);
    color: white;
    padding: 15px;
    margin: 0;
    font-size: 16px;
    text-align: center;
}

.users-list {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
}

.user-item {
    display: flex;
    align-items: center;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 5px;
    transition: background 0.2s ease;
}

.user-item:hover {
    background: #f0f0f0;
}

.user-item.current-user {
    background: #e3f2fd;
    border: 1px solid #2196f3;
}

.user-status {
    width: 10px;
    height: 10px;
    background: #4caf50;
    border-radius: 50%;
    margin-right: 10px;
}

.user-name {
    font-weight: 500;
    color: #333;
}

/* Message Input Container - Fixed at bottom like WhatsApp */
.message-input-container {
    background: #f0f0f0;
    padding: 10px 20px;
    border-top: 1px solid #e0e0e0;
    position: sticky;
    bottom: 0;
    z-index: 1000;
}

.message-input-container form {
    display: flex;
    align-items: flex-end;
    gap: 10px;
}

.message-input-container textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    min-height: 20px;
    max-height: 100px;
    overflow-y: auto;
    background: white;
    transition: border-color 0.3s ease;
    line-height: 1.4;
}

.message-input-container textarea:focus {
    outline: none;
    border-color: #075e54;
}

.message-input-container button {
    background: #086565;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background 0.3s ease;
    white-space: nowrap;
}

.message-input-container button:hover {
    background: #0d6b5e;
}

.message-input-container button:active {
    transform: scale(0.95);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .users-sidebar {
        display: none;
    }

    .login-form {
        min-width: 300px;
        margin: 20px;
    }

    .message {
        max-width: 85%;
    }

    .message-input-container {
        padding: 10px 15px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message {
    animation: fadeIn 0.3s ease;
}

/* Fix for auto-resize textarea */
.message-input-container textarea {
    overflow: hidden;
    height: auto;
}

/* Prevent the blue gradient from appearing when typing */
.message-input-container textarea:focus {
    background: white !important;
}

/* Ensure messages area stays scrollable */
.messages {
    height: 0; /* This forces the flex item to be scrollable */
}