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

body {
    font-family: 'Amazon Ember', 'Helvetica Neue', Roboto, Arial, sans-serif;
    background: linear-gradient(135deg, #232f3e 0%, #1a242f 100%);
    color: #ffffff;
    min-height: 100vh;
}

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

header {
    background: rgba(0, 0, 0, 0.3);
    padding: 30px 0;
    border-bottom: 3px solid #ff9900;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
}

main {
    padding-bottom: 60px;
}

.demo-section {
    margin-bottom: 50px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 30px;
    backdrop-filter: blur(10px);
}

.demo-section h2 {
    font-size: 1.8rem;
    color: #ff9900;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(255, 153, 0, 0.3);
}

.demo-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.demo-item {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    padding: 20px;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.demo-item:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #ff9900;
    transform: translateX(5px);
}

.demo-info {
    flex: 1;
}

.demo-item h3 {
    font-size: 1.3rem;
    color: #ffffff;
    margin-bottom: 8px;
    font-weight: 600;
}

.demo-description {
    font-size: 0.95rem;
    color: #cccccc;
    line-height: 1.5;
    margin: 0;
}

.presenter {
    font-size: 0.9rem;
    color: #aaaaaa;
    font-weight: 400;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #ff9900;
    color: #232f3e;
}

.btn-primary:hover {
    background: #ec7211;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 153, 0, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:not(.disabled):hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-secondary.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.coming-soon {
    display: inline-block;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.05);
    color: #aaaaaa;
    border-radius: 4px;
    font-style: italic;
    font-size: 0.95rem;
}

footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer p {
    color: #aaaaaa;
    font-size: 0.9rem;
}

.offline-download {
    margin-top: 15px;
}

.download-link {
    color: #ff9900;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.download-link:hover {
    color: #ec7211;
    text-decoration: underline;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .demo-section {
        padding: 20px;
    }
    
    .demo-section h2 {
        font-size: 1.4rem;
    }
    
    .demo-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .demo-item h3 {
        font-size: 1.1rem;
    }
    
    .btn {
        text-align: center;
        width: 100%;
    }
}

/* Screensaver */
.screensaver {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.screensaver.active {
    opacity: 1;
    visibility: visible;
}

.screensaver-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}