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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    min-height: 100vh;
    color: #e5e5e5;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('img/background.webp');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    filter: blur(8px);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(20, 20, 20, 0.75);
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 2rem;
}

.logo {
    max-width: 200px;
    height: auto;
    display: inline-block;
    filter: brightness(0) invert(1);
}

main {
    background: rgba(30, 30, 30, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 2.5rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.pdf-section {
    margin-bottom: 3rem;
}

.pdf-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #ffffff;
    letter-spacing: -0.3px;
    padding-top: 10px;
    padding-bottom: 10px;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.no-files {
    text-align: center;
    color: #999;
    font-size: 1.1rem;
}

.pdf-list {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.pdf-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: rgba(40, 40, 40, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    text-decoration: none;
    color: #e5e5e5;
    transition: all 0.2s ease;
    cursor: pointer;
}

.pdf-item:hover {
    background: rgba(50, 50, 50, 0.7);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.pdf-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    color: #ff6b6b;
    opacity: 0.9;
}

.pdf-name {
    font-size: 0.95rem;
    line-height: 1.5;
    word-break: break-word;
    flex: 1;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    main {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .pdf-list {
        grid-template-columns: 1fr;
    }
    
    .logo {
        max-width: 150px;
    }
}