.zvuk-generator-frontend-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.zvuk-generator-container {
    background: #fff;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.zvuk-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.zvuk-left-column {
    min-width: 0;
}

.zvuk-right-column {
    min-width: 0;
    position: sticky;
    top: 20px;
    align-self: start;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

@media (max-width: 1200px) {
    .zvuk-layout {
        grid-template-columns: 1fr;
    }
    
    .zvuk-right-column {
        position: static;
        max-height: none;
    }
}

.zvuk-section {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.zvuk-section:last-child {
    border-bottom: none;
}

.zvuk-section h2 {
    margin-top: 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #2271b1;
    color: #1d2327;
    font-size: 24px;
}

/* Сетка букв */
.zvuk-letters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.zvuk-letter-checkbox {
    display: block;
    cursor: pointer;
}

.zvuk-letter-checkbox input[type="checkbox"] {
    display: none;
}

.zvuk-letter-box {
    display: block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: #f0f0f1;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 20px;
    font-weight: bold;
    transition: all 0.2s;
}

.zvuk-letter-checkbox input[type="checkbox"]:checked + .zvuk-letter-box {
    background: #2271b1;
    color: #fff;
    border-color: #2271b1;
    transform: scale(1.1);
}

.zvuk-letter-checkbox:hover .zvuk-letter-box {
    border-color: #2271b1;
}

/* Кнопка генерации */
#zvuk-generate-btn {
    margin-top: 20px;
    padding: 12px 24px;
    background: #2271b1;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

#zvuk-generate-btn:hover {
    background: #135e96;
}

#zvuk-generate-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#zvuk-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #2271b1;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Результат */
#zvuk-result {
    margin-top: 20px;
    padding: 15px;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
}

#zvuk-result p {
    margin: 0 0 10px 0;
    color: #155724;
    font-weight: 600;
}

#zvuk-download-link {
    display: inline-block;
    padding: 10px 20px;
    background: #2271b1;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.2s;
    font-weight: 600;
}

#zvuk-download-link:hover {
    background: #135e96;
    color: #fff;
}

/* Предпросмотр */
.zvuk-preview-container {
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    min-height: 300px;
    overflow-x: hidden;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.zvuk-preview-page {
    background: #fff;
    /* лист всегда занимает всю доступную ширину колонки, но не больше 500px */
    width: 100%;
    max-width: 500px;
    /* сохраняем пропорции A4 */
    aspect-ratio: 210 / 297;
    padding: 20px;
    box-sizing: border-box;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    margin: 0 auto 10px auto; /* ~1 см между листами */
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .zvuk-preview-container {
        padding: 5px;
    }

    .zvuk-preview-page {
        /* на мобиле лист занимает всю ширину минус отступы */
        width: calc(100vw - 60px);
        max-width: 280px;
        padding: 8px;
    }

    .zvuk-preview-main-title {
        font-size: 14px;
    }

    .zvuk-preview-instruction {
        font-size: 7px;
        margin-bottom: 5px;
    }

    .zvuk-preview-letter-cell {
        font-size: 20px;
        width: 50px;
    }

    .zvuk-preview-image {
        width: 32px;
        height: 32px;
    }

    .zvuk-preview-image-cell {
        width: 70px;
        padding: 3px;
    }

    .zvuk-preview-circle {
        width: 8px;
        height: 8px;
        border-width: 1px;
    }

    .zvuk-preview-squares {
        gap: 2px;
    }

    .zvuk-preview-table td {
        padding: 1px;
    }
}

.zvuk-preview-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2px;
}

.zvuk-preview-logo img {
    max-width: 30px;
    max-height: 20px;
    display: block;
}

.zvuk-preview-site {
    text-align: right;
    color: #999;
    font-size: 7px;
    font-family: Arial, sans-serif;
}

.zvuk-preview-site-name {
    font-weight: 600;
}

.zvuk-preview-site-url {
    color: #777;
}

.zvuk-preview-main-title {
    text-align: center;
    font-weight: bold;
    font-size: 24px;
    margin: 0 auto 5px auto;
    font-family: Arial, sans-serif;
}

.zvuk-preview-instruction {
    text-align: left;
    font-size: 7px; /* было 11px, чтобы не раздувать высоту и не резать 6‑ю букву */
    line-height: 1.2;
    margin-bottom: 2px;
    color: #333;
    font-family: Arial, sans-serif;
    width: 100%;
}

.zvuk-preview-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2px;
}

.zvuk-preview-table td {
    padding: 3px;
    text-align: center;
    vertical-align: middle;
}

.zvuk-preview-image-cell {
    border: none !important;
}

.zvuk-preview-letter-cell {
    width: 80px;
    font-size: 36px;
    font-weight: bold;
    color: #2271b1;
    background: transparent;
    border: none !important;
}

.zvuk-preview-image-cell {
    width: 120px;
    padding: 10px;
}

.zvuk-preview-image {
    width: 60px;
    height: 60px;
    background: #f0f0f0;
    border: 1px dashed #ccc;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 7px;
    margin: 0 auto;
}

.zvuk-preview-squares {
    display: flex;
    gap: 3px;
    justify-content: center;
    margin-top: 2px;
}

.zvuk-preview-circle {
    width: 14px;
    height: 14px;
    border: 2px solid #000;
    border-radius: 50%;
    display: inline-block;
    background: transparent;
}

.zvuk-preview-page {
    position: relative;
}

.zvuk-preview-watermark-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.zvuk-preview-watermark {
    position: absolute;
    white-space: nowrap;
    font-weight: 600;
}

.zvuk-preview-legend {
    margin-top: auto;
    padding-top: 10px;
    text-align: center;
    font-style: italic;
    font-size: 10px;
    color: #666;
}