@media (max-width: 480px) {
    body {
        font-size: 14px;
        line-height: 1.5;
    }


    h1 {
        font-size: var(--font-size-lg);
        margin: var(--space-lg) 0 var(--space-md);
        text-align: center;
        line-height: 1.3;
        padding: 0 var(--space-sm);
    }

    #pdf-container {
        width: 95%;
        padding: var(--space-md);
        margin: 0 auto var(--space-lg);
        border-radius: var(--radius-md);
    }

    #pdf-container:hover {
        transform: none;
        box-shadow: var(--shadow-md);
    }

    #pdf-canvas {
        width: 100%;
        height: auto;
        border-radius: var(--radius-sm);
    }

    #controls {
        width: 100%;
        gap: var(--space-sm);
    }

    .nav-but, .downd-but {
        margin-top: var(--space-md);
        gap: var(--space-sm);
        flex-wrap: wrap;
    }

    #controls button {
        flex: 1;
        min-width: auto;
        padding: var(--space-md) var(--space-sm);
        font-size: var(--font-size-xs);
        font-weight: 500;
    }

    #controls button:hover {
        transform: none;
        background-color: var(--accent-primary-hover);
    }

    #page-count {
        margin-top: var(--space-sm);
        font-size: 0.8rem;
        padding: var(--space-xs) var(--space-sm);
        text-align: center;
    }

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--font-size-xs);
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .btn:hover {
        transform: none;
    }

    .header-container {
        padding: var(--space-md) 0;
        flex-direction: column;
    }
}

@media (min-width: 481px) and (max-width: 767px) {

    #pdf-container {
        width: 90%;
        padding: var(--space-lg);
    }

    .nav-but, .downd-but {
        gap: var(--space-md);
    }

    #controls button {
        min-width: 100px;
        padding: var(--space-sm) var(--space-lg);
    }
}

@media (min-width: 768px) and (max-width: 991px) {

    #pdf-container {
        width: 85%;
    }

    #controls {
        flex-direction: row;
        justify-content: center;
    }

    .nav-but, .downd-but {
        flex-direction: row;
        justify-content: center;
    }
}

@media (max-width: 767px) and (orientation: landscape) {
    body {
        font-size: 13px;
    }

    h1 {
        font-size: var(--font-size-md);
        margin: var(--space-sm) 0;
    }

    #pdf-container {
        padding: var(--space-sm);
        margin: 0 auto var(--space-md);
    }

    .nav-but, .downd-but {
        margin-top: var(--space-sm);
    }

    #page-count {
        margin-top: var(--space-xs);
    }
}

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    #pdf-canvas {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

@media (prefers-color-scheme: dark) and (max-width: 767px) {
    #pdf-container {
        border: 1px solid var(--bg-tertiary);
    }
}

@media (max-width: 767px) {
    button:focus,
    .btn:focus,
    a:focus {
        outline: 2px solid var(--accent-primary);
        outline-offset: 2px;
    }

    .btn-secondary {
        border-width: 2px;
    }

    p, div {
        line-height: 1.6;
    }
}


@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}