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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand h1 {
    font-size: 28px;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
    font-weight: 500;
}

.nav-menu a:hover,
.nav-menu a.active {
    opacity: 0.8;
    font-weight: bold;
}

.btn-nav {
    background: white;
    color: #667eea;
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: bold;
    transition: all 0.3s;
}

.btn-nav:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 5px 0;
    transition: all 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: bold;
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.placeholder-image {
    font-size: 120px;
    text-align: center;
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: transparent;
    color: white;
}

.btn-large {
    padding: 15px 50px;
    font-size: 18px;
}

/* Features Preview */
.features-preview {
    padding: 80px 0;
    background: #f5f5f5;
}

.features-preview h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.feature-card h3 {
    margin: 15px 0;
    font-size: 20px;
    color: #667eea;
}

.feature-card p {
    color: #666;
}

/* Platforms Section */
.platforms {
    padding: 80px 0;
    background: white;
}

.platforms h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.platform {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s;
}

.platform:hover {
    transform: translateY(-5px);
}

.platform h3 {
    margin-bottom: 10px;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.cta h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.95;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 42px;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* Features Detailed */
.features-detailed {
    padding: 60px 0;
}

.feature-item {
    margin-bottom: 40px;
}

.feature-description h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 28px;
}

.feature-description p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.8;
}

.feature-item ul {
    list-style: none;
    margin: 20px 0;
}

.feature-item ul li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: #555;
}

.feature-item ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

/* About Content */
.about-content {
    padding: 60px 0;
}

.about-section {
    margin-bottom: 50px;
}

.about-section h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: #667eea;
}

.about-section p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 15px;
}

.why-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 20px;
}

.why-item {
    background: #f5f5f5;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.why-item h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.tech-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tech-item {
    background: white;
    border: 2px solid #667eea;
    padding: 20px;
    border-radius: 8px;
}

.tech-item h4 {
    color: #667eea;
    margin-bottom: 10px;
}

/* Download Content */
.download-content {
    padding: 60px 0;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.download-card {
    background: white;
    border: 2px solid #ddd;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s;
}

.download-card:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
    transform: translateY(-5px);
}

.download-card h2 {
    color: #667eea;
    margin-bottom: 10px;
}

.version-info {
    font-size: 12px;
    color: #999;
    margin-top: 10px;
}

.download-info {
    background: #f5f5f5;
    padding: 40px;
    border-radius: 8px;
}

.download-info h2 {
    color: #667eea;
    margin-bottom: 30px;
    text-align: center;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.requirement {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.requirement h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.requirement ul {
    list-style: none;
}

.requirement ul li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #666;
}

.requirement ul li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #667eea;
}

/* Contact Content */
.contact-content {
    padding: 60px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.contact-form-section h2,
.contact-info-section h2 {
    margin-bottom: 30px;
    color: #667eea;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #333;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.info-item {
    margin-bottom: 30px;
}

.info-item h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.info-item p {
    margin-bottom: 5px;
    color: #666;
}

.info-item a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s;
}

.info-item a:hover {
    color: #764ba2;
    text-decoration: underline;
}

.social-links {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid #eee;
}

.social-links h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.social-icon {
    display: inline-block;
    margin-right: 15px;
    margin-bottom: 10px;
    padding: 8px 15px;
    background: #667eea;
    color: white;
    border-radius: 4px;
    text-decoration: none;
    transition: background 0.3s;
    font-size: 14px;
}

.social-icon:hover {
    background: #764ba2;
}

.faq-section {
    background: #f5f5f5;
    padding: 40px;
    border-radius: 8px;
}

.faq-section h2 {
    margin-bottom: 30px;
    color: #667eea;
    text-align: center;
}

.faq-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.faq-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.faq-item h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.faq-item p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #333;
    color: white;
    padding: 50px 0 20px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h4 {
    margin-bottom: 15px;
    color: white;
}

.footer-section p {
    color: #aaa;
    line-height: 1.6;
}

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

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

.footer-section a:hover {
    color: white;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #555;
    color: #aaa;
}

#formStatus {
    margin-top: 20px;
}

.alert {
    padding: 15px;
    border-radius: 4px;
    font-weight: 500;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}