/*
    Project: Surveillance Video Dataset
    Author: Molla Samser
    Website: https://rskworld.in/
    Contact: help@rskworld.in
    Phone: +91 93305 39277
    Address: Nutanhat, Mongolkote, Purba Burdwan, West Bengal, India, 713147
*/
* {
    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%);
    background-attachment: fixed;
    min-height: 100vh;
    padding: 0;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    margin-top: 20px;
    margin-bottom: 20px;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    padding: 8px 15px;
    border-radius: 5px;
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 15s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

header h1 {
    font-size: 3em;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

header h1 i {
    margin-right: 15px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.subtitle {
    font-size: 1.3em;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

.content {
    padding: 50px 40px;
}

section {
    margin-bottom: 50px;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h2 {
    color: #667eea;
    margin-bottom: 25px;
    font-size: 2em;
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

h2 i {
    margin-right: 15px;
    color: #764ba2;
}

.info-section {
    margin-bottom: 40px;
}

.info-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 30px;
    border-radius: 15px;
    border-left: 5px solid #667eea;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.info-item {
    padding: 15px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.info-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

.feature-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.3);
    border-color: #667eea;
}

.feature-card i {
    font-size: 3em;
    color: #667eea;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.feature-card:hover i {
    transform: scale(1.2) rotate(5deg);
}

.feature-card h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.2em;
}

.feature-card p {
    color: #666;
    font-size: 0.95em;
}

.video-container {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 15px;
    padding: 25px;
    margin-top: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

#surveillanceVideo {
    width: 100%;
    max-height: 600px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.5);
}

.video-controls {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn:active {
    transform: translateY(-1px);
}

.description-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.description-section ul {
    margin-left: 25px;
    margin-top: 20px;
}

.description-section li {
    margin-bottom: 12px;
    padding-left: 10px;
    position: relative;
}

.description-section li::before {
    content: '✓';
    position: absolute;
    left: -20px;
    color: #667eea;
    font-weight: bold;
}

.download-section {
    text-align: center;
}

.download-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 50px;
    border-radius: 15px;
    margin-top: 25px;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.download-card p {
    position: relative;
    z-index: 1;
    font-size: 1.2em;
    margin-bottom: 20px;
}

.btn-download {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 18px 40px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    margin-top: 20px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-download:hover {
    transform: scale(1.1) translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.code-section {
    background: linear-gradient(135deg, #1e1e1e 0%, #2d2d2d 100%);
    border-radius: 15px;
    padding: 30px;
    color: white;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.code-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.tab-btn {
    background: #333;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.tab-btn:hover {
    background: #444;
    transform: translateY(-2px);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.tab-content.active {
    display: block;
}

.tab-content pre {
    background: #2d2d2d;
    padding: 25px;
    border-radius: 10px;
    overflow-x: auto;
    border: 1px solid #444;
}

.tab-content code {
    color: #d4d4d4;
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 0.95em;
    line-height: 1.8;
}

/* Installation Steps */
.installation-steps {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 30px;
    border-radius: 15px;
    margin: 25px 0;
    border-left: 5px solid #667eea;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.step {
    margin: 25px 0;
    padding: 20px;
    background: white;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.step:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.step-number {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    text-align: center;
    line-height: 35px;
    margin-right: 15px;
    font-weight: bold;
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.4);
}

.feature-detail {
    background: white;
    padding: 25px;
    border-radius: 12px;
    margin: 20px 0;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

.feature-detail:hover {
    border-color: #667eea;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.2);
    transform: translateY(-3px);
}

.feature-detail h4 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-detail .file-name {
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
    padding: 8px 15px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    display: inline-block;
    margin: 8px 5px;
    font-weight: 600;
    color: #667eea;
    border: 1px solid #ddd;
}

.command-box {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 18px;
    border-radius: 8px;
    margin: 15px 0;
    font-family: 'Courier New', 'Consolas', monospace;
    overflow-x: auto;
    border: 1px solid #444;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.3);
}

/* Footer */
footer {
    background: linear-gradient(135deg, #2d2d2d 0%, #1a1a1a 100%);
    color: white;
    padding: 50px 40px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    color: #667eea;
    font-size: 1.3em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin: 12px 0;
    transition: transform 0.3s ease;
}

.footer-section ul li:hover {
    transform: translateX(5px);
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #667eea;
    text-decoration: underline;
}

footer > div:last-child {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    color: #aaa;
}

footer > div:last-child a {
    color: #667eea;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
        padding: 15px 20px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .content {
        padding: 30px 20px;
    }
    
    h2 {
        font-size: 1.5em;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .video-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5568d3 0%, #6a3d8a 100%);
}

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

/* Selection Color */
::selection {
    background: #667eea;
    color: white;
}

::-moz-selection {
    background: #667eea;
    color: white;
}