/*
Educational Tutor Bot Stylesheet - Modern Design
Author: RSK World (https://rskworld.in)
Founded by: Molla Samser
Designer & Tester: Rima Khatun
Contact: info@rskworld.com, +91 93305 39277
Year: 2026
*/

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.demo-container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
}

.demo-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.demo-header h1 {
    font-size: 32px;
    margin-bottom: 10px;
}

.demo-header p {
    font-size: 16px;
    opacity: 0.9;
}

.demo-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.chat-section {
    flex: 2;
    display: flex;
    flex-direction: column;
    border-right: 1px solid #e0e0e0;
}

.features-panel {
    flex: 1;
    background: #f9f9f9;
    overflow-y: auto;
    padding: 20px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #f5f5f5;
}

.message {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    position: relative;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.bot .message-content {
    background: white;
    color: #333;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.message-meta {
    font-size: 10px;
    opacity: 0.7;
    margin-top: 5px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.meta-badge {
    background: rgba(102, 126, 234, 0.1);
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 9px;
}

.chat-input-container {
    padding: 20px;
    background: white;
    border-top: 1px solid #e0e0e0;
    display: flex;
    gap: 10px;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

.chat-input:focus {
    border-color: #667eea;
}

.send-button {
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: transform 0.2s;
}

.send-button:hover {
    transform: scale(1.05);
}

.send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.quick-actions {
    display: flex;
    gap: 10px;
    padding: 15px 20px;
    background: #f9f9f9;
    border-top: 1px solid #e0e0e0;
    flex-wrap: wrap;
}

.quick-action-btn {
    padding: 8px 16px;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s;
}

.quick-action-btn:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.features-panel h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 18px;
}

.feature-item {
    background: white;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.feature-item h4 {
    color: #764ba2;
    margin-bottom: 8px;
    font-size: 14px;
}

.feature-item p {
    font-size: 12px;
    color: #666;
    line-height: 1.5;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 15px;
}

.stat-card {
    background: white;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.stat-label {
    font-size: 11px;
    color: #666;
    margin-top: 5px;
}

.loading {
    display: none;
    text-align: center;
    padding: 10px;
    color: #667eea;
}

.loading.show {
    display: block;
}

.typing-indicator {
    display: inline-flex;
    gap: 4px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: #667eea;
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

.demo-footer {
    text-align: center;
    padding: 15px;
    background: #f9f9f9;
    border-top: 1px solid #e0e0e0;
    font-size: 12px;
    color: #666;
}

.demo-footer a {
    color: #667eea;
    text-decoration: none;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    z-index: 1001;
    transition: width 0.1s;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

@media (max-width: 768px) {
    .demo-content {
        flex-direction: column;
    }

    .features-panel {
        max-height: 300px;
    }

    .demo-header h1 {
        font-size: 24px;
    }

    .demo-header p {
        font-size: 14px;
    }

    .message-content {
        max-width: 85%;
    }
}

/* Custom Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

.features-panel::-webkit-scrollbar {
    width: 8px;
}

.features-panel::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.features-panel::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

.features-panel::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}