@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

/* --- ОСНОВНЫЕ ПЕРЕМЕННЫЕ И СТИЛИ --- */
:root {
    --primary-color: #007bff;
    --secondary-color: #0056b3;
    --background-color: #f4f7f9;
    --surface-color: #ffffff;
    --text-color: #212529;
    --text-muted-color: #6c757d;
    --border-color: #dee2e6;
    --success-color: #198754;
    --danger-color: #dc3545;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 10px rgba(0,0,0,0.08);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* --- Анимация для плавного появления секций --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- СТРУКТУРА ПРИЛОЖЕНИЯ --- */
.app-header {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

#reset-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.app-main {
    padding: 2rem;
}

.app-section {
    display: none; /* Все секции скрыты по умолчанию */
}
.app-section.visible {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}

/* --- СЕКЦИЯ ЗАГРУЗКИ --- */
.upload-container {
    max-width: 600px;
    margin: 5rem auto;
    padding: 2.5rem;
    background: var(--surface-color);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

#upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
#upload-zone.dragover {
    background-color: #e9f5ff;
    border-color: var(--primary-color);
}
#upload-zone .upload-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}
#file-name {
    margin-top: 15px;
    color: var(--text-muted-color);
    font-style: italic;
    min-height: 24px;
}

/* --- СЕКЦИЯ ОБРАБОТКИ --- */
.processing-container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 2rem;
    background: var(--surface-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

#log-container {
    height: 350px;
    background-color: #f8f9fa;
    border: 1px solid var(--border-color);
    color: var(--text-muted-color);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85em;
    overflow-y: scroll;
    border-radius: 8px;
    padding: 15px;
    white-space: pre-wrap;
    margin-top: 1rem;
}

/* --- СЕКЦИЯ РЕДАКТОРА --- */
.editor-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap; /* Для мобильных устройств */
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--surface-color);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 80px; /* Высота хедера + отступ */
    z-index: 90;
    margin-bottom: 2rem;
}

.page-grid-wrapper {
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 10px;
}

.page-grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
    padding-bottom: 2rem;
}

.page-card {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #fff;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    cursor: zoom-in;
}
.page-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.page-card.deleted {
    opacity: 0.4;
}
.page-card.deleted .page-thumbnail { filter: grayscale(100%); }

.page-card.selected {
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 15px rgba(0, 123, 255, 0.3);
}
.page-card.selected::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--primary-color);
    border-radius: 10px;
    z-index: -1;
    opacity: 0.2;
}

.page-thumbnail {
    width: 100%;
    height: 240px;
    object-fit: contain;
    padding: 8px;
    background-color: #f8f9fa;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.page-info {
    padding: 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    border-top: 1px solid var(--border-color);
}

.page-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.page-card:hover .page-actions { opacity: 1; }
.page-actions .btn {
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
    padding: 0;
    line-height: 32px;
    transition: background-color 0.2s ease, transform 0.2s ease;
}
.page-actions .btn:hover {
    background-color: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

.sortable-ghost {
    opacity: 0.4;
    border: 2px dashed var(--primary-color);
    cursor: grabbing;
}
.sortable-drag { cursor: grabbing; }

/* --- СЕКЦИЯ РЕЗУЛЬТАТОВ --- */
.results-container {
    max-width: 600px;
    margin: 5rem auto;
    text-align: center;
}
.icon-success {
    font-size: 5rem;
    color: var(--success-color);
    margin-bottom: 1.5rem;
}
#download-links .btn {
    margin: 0.5rem;
}

/* --- ОБЩИЕ ЭЛЕМЕНТЫ И УТИЛИТЫ --- */
.btn-gradient {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    color: white;
    padding: 12px 25px;
    font-weight: 500;
    border-radius: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-gradient:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.25);
    color: white;
}
.btn-gradient:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}
.btn-gradient .spinner-border { display: none; }

/* --- МОДАЛЬНОЕ ОКНО --- */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex; justify-content: center; align-items: center;
    z-index: 1000;
    visibility: hidden; opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.visible {
    visibility: visible; opacity: 1;
}
.modal-content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 95vw;
    max-height: 95vh;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}
.modal-overlay.visible .modal-content-wrapper { 
    transform: scale(1); 
}
.modal-content {
    max-width: 90vw; 
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
}
.modal-filename {
    color: white;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-top: 15px;
    text-align: center;
    max-width: 90vw;
    word-break: break-all;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.modal-close {
    position: absolute; top: 20px; right: 35px;
    color: #fff; font-size: 40px; font-weight: bold;
    cursor: pointer;
    transition: color 0.2s ease;
    z-index: 1001;
}
.modal-close:hover { color: #ccc; }

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
    z-index: 1001;
}

.modal-nav:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: translateY(-50%) scale(1.1);
}

.modal-prev {
    left: 20px;
}

.modal-next {
    right: 20px;
}

.modal-rotate {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
    z-index: 1001;
}

.modal-rotate:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: scale(1.1);
}

/* --- СТИЛИ ДЛЯ TOAST-УВЕДОМЛЕНИЙ --- */
.toast-container {
    position: fixed;
    top: 80px;
    right: 2rem;
    z-index: 1050;
}
.toast-notification {
    background-color: var(--danger-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateX(100%);
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.toast-notification.show {
    opacity: 1;
    transform: translateX(0);
}