:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --accent: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --glass: rgba(255, 255, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
}

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

body, html {
    height: 100%;
    margin: 0;
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    color: var(--light);
    line-height: 1.6;
    background-attachment: fixed;
}

.page-container {
    width: 90vw;
    max-width: 95vw;
    margin: 1vh auto;
    padding: 1.5vmin;
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 15px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    text-align: center;
    transform: scale(1);
}

header {
    margin-bottom: 15px;
    padding-bottom: 10px;
}

header h1 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #fff, #a5b4fc);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

header p {
    font-size: clamp(0.9rem, 1.2vw, 1.2rem);
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.pdf-viewer-container {
    margin-bottom: 30px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    background: rgba(0,0,0,0.1);
}

.pdf-viewer-container {
    max-width: 95vw;
    margin: 0 auto 1rem;
}

.pdf-viewer-container iframe {
    display: block;
    width: 100%;
    height: 55vh;
    min-height: 40vh;
    max-height: 65vh;
    border: none;
}

.pdf-fullscreen-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--glass);
    backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--light);
    padding: 8px 15px;
    cursor: pointer;
    z-index: 10;
    transition: all 0.3s ease;
}

.pdf-fullscreen-btn:hover {
    background: rgba(255,255,255,0.3);
}

.pdf-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 600px;
    background: rgba(0,0,0,0.1);
}

.pdf-loading::after {
    content: "";
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.pdf-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1vmin;
    padding: 1vmin;
    background: rgba(0,0,0,0.1);
}

.pdf-nav {
    padding: 10px 20px;
    background: var(--glass);
    backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--light);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pdf-nav:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

.page-info {
    font-size: 1.1rem;
    font-weight: 500;
    min-width: 100px;
}

.download-container {
    margin-top: 20px;
}

.download-button {
    display: inline-flex;
    align-items: center;
    gap: 1vmin;
    padding: 1.2vmin 2.5vmin;
    font-size: clamp(0.9rem, 1.3vw, 1.2rem);
    font-weight: 600;
    color: white;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 3px 10px rgba(67, 97, 238, 0.3);
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
    background: linear-gradient(to right, var(--accent), var(--primary));
}

.download-button:active {
    transform: translateY(0);
}

.download-button svg {
    transition: transform 0.3s ease;
}

.download-button:hover svg {
    transform: translateY(3px);
}

/* Mobile Responsiveness */
/* Remove scaling on large screens */

@media (max-width: 768px) {
    .page-container {
        width: 95%;
        padding: 20px;
        margin: 20px auto;
    }

    header h1 {
        font-size: 1.8rem;
    }

    header p {
        font-size: 1rem;
    }

    .pdf-viewer-container iframe {
        height: 400px;
    }

    .pdf-controls {
        flex-direction: column;
        gap: 10px;
    }

    .download-button {
        padding: 12px 25px;
        font-size: 1.1rem;
    }
    
    .pdf-fullscreen-btn {
        top: 10px;
        right: 10px;
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .pdf-viewer-container iframe {
        height: 300px;
    }

    .pdf-nav {
        width: 100%;
        padding: 12px;
    }
    
    .pdf-fullscreen-btn {
        display: none;
    }
}