* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 20px 10px;
    background: #e9e9e9;
    color: #242424;
    font-family: Georgia, "Times New Roman", serif;
    user-select: none;
    -webkit-user-select: none;
}

header {
    text-align: center;
    margin-bottom: 24px;
}

header h1 {
    font-size: 28px;
    font-weight: normal;
    margin-bottom: 8px;
}

.subtitle {
    color: #777;
    font: 12px Arial, sans-serif;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

main {
    max-width: 900px;
    margin: auto;
    padding: 20px;
    background: white;
    border: 1px solid #ddd;
}

.toolbar,
.navigation {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    font: 14px Arial, sans-serif;
}

.navigation {
    margin-top: 20px;
}

button,
select {
    padding: 10px 14px;
    min-height: 40px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: white;
    font-size: 14px;
}

button { cursor: pointer; }

button:disabled,
select:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

#counter {
    min-width: 110px;
    text-align: center;
    font-weight: bold;
}

#reader {
    position: relative;
    min-height: 200px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    overflow: hidden;
}

#loading {
    padding: 40px 10px;
    text-align: center;
    color: #777;
}

#page-container {
    position: relative;
    width: 100%;
}

#page {
    display: block;
    width: 100%;
    height: auto;
    pointer-events: none;
    -webkit-user-drag: none;
}

.watermark {
    position: absolute;
    z-index: 1;
    top: 50%;
    left: 50%;
    width: 100%;
    transform: translate(-50%, -50%) rotate(-35deg);
    color: rgba(90, 90, 90, 0.17);
    text-align: center;
    font: bold clamp(14px, 3vw, 30px) Arial, sans-serif;
    letter-spacing: 3px;
    white-space: nowrap;
    pointer-events: none;
}

#status {
    min-height: 18px;
    color: #777;
    text-align: center;
    font: 13px Arial, sans-serif;
}

footer {
    margin-top: 20px;
    color: #777;
    text-align: center;
    font: 11px/1.6 Arial, sans-serif;
}

@media (max-width: 600px) {
    main { padding: 12px 8px; }
    .navigation { gap: 8px; }
    button { padding: 9px; }
}

@media print {
    body { display: none !important; }
}