:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --background-color: #ffffff;
}

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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.presentation-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

.navigation {
    margin-bottom: 1rem;
}

.nav-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.nav-buttons button {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.3s ease;
}

.nav-buttons button:hover {
    color: var(--accent-color);
}

.slide-indicators {
    display: flex;
    gap: 0.5rem;
}

.slide-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    opacity: 0.5;
    cursor: pointer;
    transition: all 0.3s ease;
}

.slide-indicator.active {
    opacity: 1;
    background-color: var(--accent-color);
}

.slide-container {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
}

.slide {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.slide-header {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 4px;
}

.slide-header h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.slide-header ul {
    list-style: none;
}

.slide-header li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9rem;
}

.slide-header li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.transcript {
    flex: 1;
    padding: 1.5rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    font-size: 1.1rem;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .presentation-container {
        padding: 0.5rem;
    }
    
    .slide-header h2 {
        font-size: 1.3rem;
    }
    
    .transcript {
        font-size: 1rem;
        padding: 1rem;
    }
}