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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f0f2f5;
}

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

header {
    color: white;
    text-align: center;
    position: relative;
    height: 400px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: 20px 0;
}

.banner {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    z-index: 1;
}

.banner-container {
    width: 100%;
    height: 100%;
    border-radius: 15px;
    overflow: hidden;
    position: relative;
}

.banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 15px;
}

.banner-content {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    z-index: 1;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.features {
    padding: 80px 0;
    background-color: #fff;
    margin: 20px 0;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

h2 {
    text-align: center;
    margin-bottom: 40px;
}

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

.feature-item {
    text-align: center;
    padding: 20px;
    margin: 20px;
}

.feature-item img {
    width: 120px;
    height: 120px;
    margin-bottom: 20px;
}

.download {
    background-color: #fff;
    padding: 80px 0;
    text-align: center;
    margin: 20px 0;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.qr-container {
    max-width: 400px;
    margin: 0 auto;
}

.qr-code {
    width: 280px;
    height: 280px;
    margin-bottom: 20px;
}

.download-btn {
    display: inline-block;
    background-color: #1e88e5;
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    margin-top: 20px;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #1565c0;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 40px 0;
    margin-top: 40px;
}

.organizer {
    margin-bottom: 30px;
}

.org-item {
    margin-bottom: 20px;
}

.org-item h4 {
    font-size: 1.1em;
    color: #fff;
    margin-bottom: 10px;
    font-weight: normal;
    opacity: 0.9;
}

.org-item p {
    font-size: 1em;
    color: #fff;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
}

.footer-bottom p {
    margin: 5px 0;
    font-size: 0.9em;
    opacity: 0.7;
}

.footer-bottom a {
    color: #fff;
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.footer-bottom a:hover {
    opacity: 1;
}

@media (max-width: 768px) {
    header {
        height: 200px;
        padding: 10px 0;
    }
    
    .banner-container {
        border-radius: 10px;
    }
    
    .banner-overlay {
        border-radius: 10px;
    }

    h1 {
        font-size: 2em;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }
}

.app-intro {
    padding: 80px 0;
    background-color: #fff;
    margin: 20px 0;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.app-content {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-top: 40px;
}

.app-text {
    flex: 1.2;
}

.app-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.app-features li {
    margin-bottom: 0;
}

.feature-box {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid #e0e0e0;
    margin: 0 15px;
    transition: transform 0.3s ease;
}

.feature-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: #d0d0d0;
}

.app-features h4 {
    font-size: 1.3em;
    margin-bottom: 15px;
    color: #333;
    border-bottom: 2px solid #1e88e5;
    padding-bottom: 8px;
    display: inline-block;
}

.feature-desc {
    padding: 0 10px;
}

.app-features p {
    margin: 8px 0;
    color: #666;
    font-size: 1em;
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
}

.app-features p::before {
    content: "•";
    position: absolute;
    left: 5px;
    color: #1e88e5;
}

.app-image {
    flex: 0.8;
    text-align: center;
}

.preview-img {
    max-width: 300px;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .app-content {
        flex-direction: column;
    }
    
    .app-image {
        order: -1;
    }
    
    .preview-img {
        max-width: 200px;
    }
    
    .feature-box {
        padding: 15px;
        margin: 0 10px;
    }
    
    .app-features h4 {
        font-size: 1.2em;
    }
    
    .app-features p {
        font-size: 0.95em;
        padding-left: 15px;
    }
    
    .app-features p::before {
        left: 3px;
    }
}