/* ========== READER.CSS - ИСПРАВЛЕННАЯ ВЕРСИЯ ========== */

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-gray: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary-color: #e0e0e0;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-gray: #2d3748;
    --border-color: #4a5568;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
    background-color: #1a202c;
    color: #e0e0e0;
}

body {
    background: #f5f5f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
}

[data-theme="dark"] body {
    background: #1a202c;
}

/* ✅ Полный GPU только при включённой настройке «Полное GPU-ускорение» */
.reader-app {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    background: white;
    overflow: hidden;
}

.reader-app[data-gpu-full="true"] {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

[data-theme="dark"] .reader-app {
    background: #1a202c;
}

/* ========== КОНТЕЙНЕР (GPU-слой только при полном GPU) ========== */
.reader-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #fafafa;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: calc(100vh - 200px);
}

.reader-app[data-gpu-full="true"] .reader-container {
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

[data-theme="dark"] .reader-container {
    background: #1a202c;
}

/* ✅ Image-wrapper всегда с GPU (минимальный режим) */
.image-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* ========== ✅ ИЗОБРАЖЕНИЕ С ПРАВИЛЬНЫМ ПОЗИЦИОНИРОВАНИЕМ ========== */
.page-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.15);
    cursor: grab;
    background: white;
    /* ✅ Absolute для центрирования */
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    /* ✅ JS управляет scale, мы управляем центрированием */
    transform-origin: center center !important;
    will-change: transform, opacity;
    /* ✅ Без transition - JS сам управляет */
    transition: none !important;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

[data-theme="dark"] .page-image {
    background: #2d3748;
    box-shadow: 0 15px 50px rgba(0,0,0,0.4);
}

.page-image:active {
    cursor: grabbing;
}

/* ========== ✅ АНИМАЦИИ С TRANSFORM + OPACITY ========== */
.page-image.slide-in-right {
    animation: slideInRight 0.35s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.page-image.slide-out-left {
    animation: slideOutLeft 0.35s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.page-image.slide-in-left {
    animation: slideInLeft 0.35s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.page-image.slide-out-right {
    animation: slideOutRight 0.35s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ✅ Keyframes с opacity + translate3d для GPU-композитинга */
@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translate3d(calc(-50% + 80px), -50%, 0);
    }

    100% {
        opacity: 1;
        transform: translate3d(-50%, -50%, 0);
    }
}

@keyframes slideOutLeft {
    0% {
        opacity: 1;
        transform: translate3d(-50%, -50%, 0);
    }

    100% {
        opacity: 0;
        transform: translate3d(calc(-50% - 80px), -50%, 0);
    }
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translate3d(calc(-50% - 80px), -50%, 0);
    }

    100% {
        opacity: 1;
        transform: translate3d(-50%, -50%, 0);
    }
}

@keyframes slideOutRight {
    0% {
        opacity: 1;
        transform: translate3d(-50%, -50%, 0);
    }

    100% {
        opacity: 0;
        transform: translate3d(calc(-50% + 80px), -50%, 0);
    }
}

/* ========== ZOOM CONTROLS ========== */
.zoom-controls {
    position: static;
    top: 90px;
    right: 20px;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
    border: 1px solid var(--border-color);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

[data-theme="dark"] .zoom-controls {
    background: #2d3748;
    border: 1px solid #4a5568;
}

@media (min-width: 1024px) {
    .zoom-controls {
        position: fixed;
    }
}

.zoom-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--secondary-color);
    background: white;
    color: var(--secondary-color);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal) !important;
}

[data-theme="dark"] .zoom-btn {
    background: #2d3748;
    border-color: #3498db;
    color: #ffffff !important;
}

.zoom-btn:hover {
    background: var(--secondary-color);
    color: white !important;
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

[data-theme="dark"] .zoom-btn:hover {
    background: #3498db;
    border-color: #2980b9;
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.5);
}

.zoom-btn:active {
    transform: translateY(0) scale(0.98);
}

/* ========== CONTROLS ========== */
.reader-controls {
    background: white;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -5px 25px rgba(0,0,0,0.08);
    padding: 15px 20px;
    position: relative;
    z-index: 1000;
    height: 140px;
    content-visibility: auto;
    contain-intrinsic-size: auto 140px;
}

[data-theme="dark"] .reader-controls {
    background: #2d3748;
    border-top: 1px solid #4a5568;
    box-shadow: 0 -5px 25px rgba(0,0,0,0.3);
}

.controls-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.nav-row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 30px;
}

.page-info {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
    min-width: 140px;
    text-align: center;
    padding: 10px 20px;
    background: var(--light-gray);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    order: -1;
}

[data-theme="dark"] .page-info {
    background: #4a5568;
    color: #e0e0e0;
    border-color: #718096;
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-btn {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    border: none;
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    font-size: 1.3rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal) !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.25);
    position: relative;
    overflow: hidden;
}

    .nav-btn::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
        transition: left 0.5s ease;
    }

    .nav-btn:hover {
        transform: translateY(-3px) scale(1.05);
        box-shadow: 0 8px 25px rgba(52, 152, 219, 0.4);
    }

        .nav-btn:hover::before {
            left: 100%;
        }

    .nav-btn:active {
        transform: translateY(-1px) scale(0.98);
    }

    .nav-btn:disabled {
        background: linear-gradient(135deg, #bdc3c7, #95a5a6);
        cursor: not-allowed;
        transform: none !important;
        box-shadow: 0 4px 15px rgba(189, 195, 199, 0.25);
        opacity: 0.6;
    }

.page-input-group {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 200px;
}

.page-input {
    width: 90px;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
    background: var(--light-gray);
    color: var(--primary-color);
    transition: all var(--transition-normal);
}

[data-theme="dark"] .page-input {
    background: #4a5568;
    color: #e0e0e0;
    border-color: #718096;
}

.page-input:focus {
    border-color: var(--secondary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
    background: white;
}

[data-theme="dark"] .page-input:focus {
    background: #4a5568;
}

.tool-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.action-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal) !important;
}

[data-theme="dark"] .action-btn {
    background: #2d3748;
    color: #e0e0e0;
    border-color: #4a5568;
}

.action-btn:hover {
    background: var(--light-gray);
    transform: translateY(-2px);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

[data-theme="dark"] .action-btn:hover {
    color: black !important;
}

.action-btn.active {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* ========== SLIDER ========== */
.slider-row {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 10px;
}

.page-slider {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    background: linear-gradient(to right, #e0e0e0, #e0e0e0);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

[data-theme="dark"] .page-slider {
    background: linear-gradient(to right, #4a5568, #4a5568);
}

.page-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: 3px solid var(--secondary-color);
    box-shadow: 0 3px 15px rgba(52, 152, 219, 0.4);
    transition: all var(--transition-normal);
}

.page-slider::-moz-range-thumb {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: 3px solid var(--secondary-color);
    box-shadow: 0 3px 15px rgba(52, 152, 219, 0.4);
    transition: all var(--transition-normal);
}

.page-slider::-webkit-slider-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.2);
}

.page-slider::-moz-range-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.2);
}

/* ========== SWIPE INDICATORS ========== */
.drag-indicator {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(52, 152, 219, 0.9);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    opacity: 0;
    transition: all var(--transition-normal) !important;
    z-index: 50;
    pointer-events: none;
    box-shadow: 0 5px 20px rgba(52, 152, 219, 0.3);
}

    .drag-indicator.left {
        left: 30px;
        transform: translateY(-50%) scale(0);
    }

    .drag-indicator.right {
        right: 30px;
        transform: translateY(-50%) scale(0);
    }

    .drag-indicator.active {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }

/* ========== CURRENT PAGE INFO ========== */
.current-page-info {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.75);
    color: white;
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    z-index: 100;
    display:none
}

/* ========== SETTINGS ========== */
.settings-panel {
    position: absolute;
    bottom: 150px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-hover);
    padding: 20px;
    z-index: 1001;
    border: 1px solid var(--border-color);
    width: 300px;
    display: none;
    animation: slideUp 0.3s ease;
    content-visibility: auto;
    contain-intrinsic-size: auto 300px;
}

[data-theme="dark"] .settings-panel {
    background: #2d3748;
    border: 1px solid #4a5568;
}

.settings-panel.show {
    display: block;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.settings-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

[data-theme="dark"] .settings-title {
    color: #e0e0e0 !important;
}

.settings-close {
    background: none;
    border: none;
    color: #999;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

[data-theme="dark"] .settings-close {
    color: #a0aec0 !important;
}

.settings-close:hover {
    background: var(--light-gray);
    color: var(--accent-color);
}

[data-theme="dark"] .settings-close:hover {
    color: var(--secondary-color) !important;
    background: rgba(255, 255, 255, 0.1);
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

[data-theme="dark"] .settings-item {
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.settings-item:last-child {
    border-bottom: none;
}

.settings-label {
    font-size: 0.95rem;
    color: var(--primary-color);
    font-weight: 500;
}

[data-theme="dark"] .settings-label {
    color: #e0e0e0 !important;
}

.settings-toggle {
    position: relative;
    width: 48px;
    height: 24px;
}

    .settings-toggle input {
        opacity: 0;
        width: 0;
        height: 0;
    }

.settings-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ddd;
    transition: var(--transition-normal);
    border-radius: 34px;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

[data-theme="dark"] .settings-toggle-slider {
    background-color: #4a5568;
}

.settings-toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: var(--transition-normal);
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.settings-toggle input:checked + .settings-toggle-slider {
    background-color: var(--secondary-color);
}

    .settings-toggle input:checked + .settings-toggle-slider:before {
        transform: translateX(24px);
    }

/* ========== LOADING ========== */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(5px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

    .loading-overlay.active {
        opacity: 1;
        visibility: visible;
    }

[data-theme="dark"] .loading-overlay {
    background: rgba(26, 32, 44, 0.95);
}

.spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.spinner {
    width: 60px;
    height: 60px;
    position: relative;
    animation: rotate 2s linear infinite;
}

.spinner-dot {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
}

    .spinner-dot:before {
        content: '';
        display: block;
        width: 12px;
        height: 12px;
        background-color: var(--secondary-color);
        border-radius: 50%;
        animation: pulse 1.2s infinite ease-in-out both;
    }

    .spinner-dot:nth-child(1) {
        transform: rotate(0deg);
    }

        .spinner-dot:nth-child(1):before {
            animation-delay: -1.1s;
        }

    .spinner-dot:nth-child(2) {
        transform: rotate(45deg);
    }

        .spinner-dot:nth-child(2):before {
            animation-delay: -1.0s;
        }

    .spinner-dot:nth-child(3) {
        transform: rotate(90deg);
    }

        .spinner-dot:nth-child(3):before {
            animation-delay: -0.9s;
        }

    .spinner-dot:nth-child(4) {
        transform: rotate(135deg);
    }

        .spinner-dot:nth-child(4):before {
            animation-delay: -0.8s;
        }

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

@keyframes pulse {
    0%, 80%, 100% {
        transform: scale(0);
    }

    40% {
        transform: scale(1);
    }
}

.loading-text {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 500;
    text-align: center;
}

[data-theme="dark"] .loading-text {
    color: #e0e0e0;
}

/* ========== HELPERS ========== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

.page-loading-shimmer,
.page-shimmer {
    display: none !important;
}

/* ========== TOAST ========== */
.toast-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--secondary-color);
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    z-index: 9999;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    transform: translateX(100px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

    .toast-notification.show {
        opacity: 1;
        transform: translateX(0);
    }

    .toast-notification.success {
        background: #2ecc71;
    }

    .toast-notification.info {
        background: #3498db;
    }

    .toast-notification.warning {
        background: #f39c12;
    }

    .toast-notification.error {
        background: #e74c3c;
    }

/* ========== MOBILE ========== */
@media (max-width: 768px) {
    .reader-container {
        height: calc(100vh - 130px);
    }

    .page-image {
        max-width: 100%;
        max-height: 95%;
    }

    .reader-controls {
        height: 80px;
        padding: 8px 10px;
    }

    .controls-container {
        gap: 5px;
    }

    .nav-row {
        gap: 5px;
        flex-wrap: nowrap;
        justify-content: space-between;
    }

    .page-info {
        font-size: 0.8rem;
        min-width: 80px;
        padding: 5px 8px;
    }

    .nav-buttons {
        gap: 10px;
    }

    .nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .page-input-group {
        display: none !important;
    }

    .zoom-controls {
        position: fixed !important;
        bottom: 90px !important;
        top: auto !important;
        right: 10px;
        flex-direction: row;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(15px);
        border-radius: 20px;
        padding: 8px;
        gap: 8px;
    }

    [data-theme="dark"] .zoom-controls {
        background: rgba(45, 55, 72, 0.95);
    }

    .zoom-btn {
        width: 38px;
        height: 38px;
        font-size: 0.9rem;
    }

    .current-page-info {
        bottom: 85px;
        font-size: 0.8rem;
        padding: 6px 20px;
    }

    .page-slider {
        height: 12px;
    }

        .page-slider::-webkit-slider-thumb,
        .page-slider::-moz-range-thumb {
            width: 30px;
            height: 30px;
        }

    .settings-panel {
        width: 90vw;
        max-width: 300px;
        bottom: 150px;
    }
}

@media (max-width: 576px) {
    .reader-container {
        height: calc(100vh - 125px);
    }

    .reader-controls {
        height: 75px;
        padding: 6px 8px;
    }

    .page-info {
        font-size: 0.75rem;
        min-width: 70px;
        padding: 4px 6px;
    }

    .nav-btn {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .zoom-controls {
        bottom: 85px !important;
        gap: 6px;
    }

    .zoom-btn {
        width: 36px;
        height: 36px;
        font-size: 0.85rem;
    }

    .current-page-info {
        bottom: 80px;
        font-size: 0.75rem;
        padding: 5px 15px;
    }
}

/* ========== ANIMATIONS ========== */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ========== ✅ УЛУЧШЕННЫЕ СТИЛИ АНИМАЦИИ (добавить в reader.css) ========== */

/* ✅ Базовые стили для изображения */
.page-image {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    /* ✅ ВАЖНО: предотвращаем мигание */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    /* ✅ Аппаратное ускорение */
    will-change: transform, opacity;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

    /* ✅ Анимация ВЫХОДА влево (следующая страница) */
    .page-image.slide-out-left {
        animation: slideOutLeft 0.3s ease-out forwards;
    }

    /* ✅ Анимация ВЫХОДА вправо (предыдущая страница) */
    .page-image.slide-out-right {
        animation: slideOutRight 0.3s ease-out forwards;
    }

    /* ✅ Анимация ВХОДА слева (предыдущая страница); both = до первого кадра уже 0% — без моргания */
    .page-image.slide-in-left {
        animation: slideInLeft 0.3s ease-out both;
    }

    /* ✅ Анимация ВХОДА справа (следующая страница) */
    .page-image.slide-in-right {
        animation: slideInRight 0.3s ease-out both;
    }

/* ========== KEYFRAMES ========== */

@keyframes slideOutLeft {
    0% {
        transform: translate(-50%, -50%) translateX(0) scale(1);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, -50%) translateX(-100%) scale(0.95);
        opacity: 0;
    }
}

@keyframes slideOutRight {
    0% {
        transform: translate(-50%, -50%) translateX(0) scale(1);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, -50%) translateX(100%) scale(0.95);
        opacity: 0;
    }
}

@keyframes slideInLeft {
    0% {
        transform: translate(-50%, -50%) translateX(-100%) scale(0.95);
        opacity: 0;
    }

    100% {
        transform: translate(-50%, -50%) translateX(0) scale(1);
        opacity: 1;
    }
}

@keyframes slideInRight {
    0% {
        transform: translate(-50%, -50%) translateX(100%) scale(0.95);
        opacity: 0;
    }

    100% {
        transform: translate(-50%, -50%) translateX(0) scale(1);
        opacity: 1;
    }
}

/* ✅ Альтернатива: FADE анимация (если slide все еще моргает) */
/* Раскомментируйте этот блок если нужна простая fade анимация */

/*
.page-image.slide-out-left,
.page-image.slide-out-right {
    animation: fadeOut 0.2s ease-out forwards;
}

.page-image.slide-in-left,
.page-image.slide-in-right {
    animation: fadeIn 0.2s ease-out forwards;
}

@keyframes fadeOut {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}
*/

/* ========== ОПТИМИЗАЦИЯ ПРОИЗВОДИТЕЛЬНОСТИ ========== */

/* ✅ Smooth transitions (GPU уже задан выше для .reader-container и .image-wrapper) */
.reader-container {
    overflow: hidden;
    position: relative;
    background: var(--reader-bg, #f5f5f5);
}

/* ✅ Предотвращаем layout shift */
.page-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* ✅ Для темной темы */
[data-theme="dark"] .reader-container {
    background: var(--reader-bg, #1a1a1a);
}

/* ========== МОБИЛЬНЫЕ КНОПКИ ВНУТРИ READER-CONTROLS ========== */

/* По умолчанию скрываем дополнительные кнопки на десктопе */
.tool-actions .action-btn.help-mobile,
.tool-actions .action-btn.reload-mobile,
.tool-actions .action-btn.settings-mobile {
    display: flex;
}

/* ========== МОБИЛЬНЫЕ КНОПКИ ВНУТРИ READER-CONTROLS ========== */

/* На мобильных устройствах показываем tool-actions и перераспределяем пространство */
@media (max-width: 768px) {
    /* ✅ УБИРАЕМ display: none из tool-actions */
    .tool-actions {
        display: flex !important;
        gap: 6px;
        margin-left: 5px;
    }

        /* ✅ Стили для кнопок в tool-actions на мобилках - УМЕНЬШЕННЫЕ */
        .tool-actions .action-btn {
            width: 36px !important;
            height: 36px !important;
            min-width: 36px !important;
            min-height: 36px !important;
            border-radius: 10px;
            border: 2px solid var(--border-color);
            background: white;
            color: var(--primary-color);
            display: flex !important;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 0.9rem;
            padding: 0 !important;
            margin: 0 !important;
        }

    [data-theme="dark"] .tool-actions .action-btn {
        background: #2d3748;
        color: #e0e0e0;
        border-color: #4a5568;
    }

    .tool-actions .action-btn:hover {
        background: var(--light-gray);
        transform: translateY(-2px);
        border-color: var(--secondary-color);
        color: var(--secondary-color);
    }

    .tool-actions .action-btn:active {
        transform: translateY(0) scale(0.95);
    }

    .tool-actions .action-btn i {
        font-size: 0.95rem;
    }

    /* ✅ Перераспределяем пространство в nav-row */
    .nav-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 5px;
        flex-wrap: nowrap;
    }

    /* ✅ Уменьшаем page-info */
    .page-info {
        min-width: 70px;
        padding: 4px 8px;
        font-size: 0.8rem;
        margin-right: 0;
        flex-shrink: 0;
    }

    /* ✅ Уменьшаем навигационные кнопки */
    .nav-buttons {
        gap: 6px;
        flex-shrink: 0;
    }

    .nav-btn {
        width: 40px !important;
        height: 40px !important;
        font-size: 1rem !important;
    }

    /* ✅ Скрываем input группы на мобилках */
    .page-input-group {
        display: none !important;
    }

    /* ✅ Настройка слайдера */
    .slider-row {
        margin-top: 5px;
    }

    .page-slider {
        height: 10px;
    }

        .page-slider::-webkit-slider-thumb {
            width: 24px;
            height: 24px;
        }
}

@media (max-width: 576px) {
    .tool-actions .action-btn {
        width: 34px !important;
        height: 34px !important;
        min-width: 34px !important;
        min-height: 34px !important;
        font-size: 0.85rem;
    }

        .tool-actions .action-btn i {
            font-size: 0.9rem;
        }

    .nav-btn {
        width: 38px !important;
        height: 38px !important;
        font-size: 0.95rem !important;
    }

    .page-info {
        min-width: 60px;
        padding: 3px 6px;
        font-size: 0.75rem;
    }
}

@media (max-width: 400px) {
    .tool-actions .action-btn {
        width: 32px !important;
        height: 32px !important;
        min-width: 32px !important;
        min-height: 32px !important;
        font-size: 0.8rem;
    }

        .tool-actions .action-btn i {
            font-size: 0.85rem;
        }

    .nav-btn {
        width: 36px !important;
        height: 36px !important;
        font-size: 0.9rem !important;
    }

    .page-info {
        min-width: 55px;
        padding: 2px 5px;
        font-size: 0.7rem;
    }
}