/* reading.css (Жаңартылған нұсқа) */

/* Негізгі контейнер */
.reading-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 20px;
}

.reading-header {
    text-align: center;
    margin-bottom: 40px;
}

.reading-title {
    font-size: 2.5rem;
    font-weight: 800;
}

.reading-subtitle {
    font-size: 1.1rem;
    color: #666;
}

/* Пән сүзгілері (Фильтр) */
.subject-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 50px;
}

.filter-btn {
    padding: 10px 22px;
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid transparent;
    background-color: #f0f2f5;
    color: #333;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.filter-btn.active {
    background-color: #3737ff;
    color: white;
}

/* Пән түстері арқылы активті filter батырмалары */
.filter-btn.active[data-subject="history"] {
    background-color: var(--color-history);
    color: white;
}

.filter-btn.active[data-subject="world_history"] {
    background-color: var(--color-world_history);
    color: white;
}

.filter-btn.active[data-subject="informatics"] {
    background-color: var(--color-informatics);
    color: white;
}

.filter-btn.active[data-subject="physics"] {
    background-color: var(--color-physics);
    color: white;
}

.filter-btn.active[data-subject="chemistry"] {
    background-color: var(--color-chemistry);
    color: white;
}

.filter-btn.active[data-subject="law_basics"] {
    background-color: var(--color-law_basics);
    color: white;
}

.filter-btn.active[data-subject="biology"] {
    background-color: var(--color-biology);
    color: white;
}

.filter-btn.active[data-subject="geography"] {
    background-color: var(--color-geography);
    color: white;
}

.filter-btn.active[data-subject="english"] {
    background-color: var(--color-english);
    color: white;
}

.filter-btn.active[data-subject="kazakh_language"] {
    background-color: var(--color-kazakh_language);
    color: white;
}

.filter-btn.active[data-subject="kazakh_literature"] {
    background-color: var(--color-kazakh_literature);
    color: white;
}

.filter-btn.active[data-subject="Барлығы"] {
    background-color: #333;
    color: white;
}

/* Кітаптар тобы */
.book-group {
    margin-bottom: 50px;
}

.subject-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 3px solid #f0f2f5;
    color: var(--primary-color);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 2rem;
}

/* CSS арқылы жасалған кітап мұқабасы */
.book-card {
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    box-shadow: 
        0 4px 20px rgba(0,0,0,0.08),
        0 1px 3px rgba(0,0,0,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    position: relative;
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

.book-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 
        0 20px 40px rgba(0,0,0,0.15),
        0 4px 15px rgba(0,0,0,0.1);
    border-color: rgba(255,255,255,0.3);
}

.book-cover {
    height: 340px;
    color: white;
    padding: 25px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    font-family: 'Outfit', sans-serif;
    text-shadow: 0 3px 8px rgba(0,0,0,0.3);
    background: linear-gradient(135deg, transparent 0%, rgba(0,0,0,0.1) 100%);
    overflow: hidden;
}

.book-cover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.15) 0%, transparent 50%),
        linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(0,0,0,0.05) 100%);
    pointer-events: none;
}

.book-cover::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.3;
    animation: subtle-float 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes subtle-float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(-2px, -2px) rotate(0.5deg); }
    66% { transform: translate(2px, -1px) rotate(-0.5deg); }
}

/* Пән түстері үшін CSS Variables */
:root {
    --color-biology: #34C759;
    --color-physics: #8A2BE2;
    --color-history: #A52A2A;
    --color-informatics: #4682B4;
    --color-chemistry: #00B7EB;
    --color-world_history: #FF4500;
    --color-geography: #2E8B57;
    --color-english: #FF69B4;
    --color-kazakh_language: #b64861;
    --color-kazakh_literature: #bb8f53;
    --color-law_basics: #1fcbcb;
    --color-default: #777;
    
    /* Жаңа түстер PDF оқу интерфейсі үшін */
    --pdf-header-bg: #ffffff;
    --pdf-body-bg: #f0f2f5;
    --pdf-footer-bg: #ffffff;
    --pdf-controls-bg: #e9ecef;
    --pdf-controls-hover: #dbe0e4;
    --pdf-controls-active: #c6cfd8;
    --pdf-text: #333333;
    --pdf-border: #e5e5e5;
    --pdf-shadow: rgba(0, 0, 0, 0.15);
    --pdf-button-primary: #3498db;
    --pdf-button-primary-hover: #2980b9;
}

    /* Түсін пәнге сәйкестендіру (PDF modal үшін) */
    .pdf-modal[data-subject-key="history"] { --pdf-button-primary: var(--color-history); }
    .pdf-modal[data-subject-key="world_history"] { --pdf-button-primary: var(--color-world_history); }
    .pdf-modal[data-subject-key="informatics"] { --pdf-button-primary: var(--color-informatics); }
    .pdf-modal[data-subject-key="physics"] { --pdf-button-primary: var(--color-physics); }
    .pdf-modal[data-subject-key="chemistry"] { --pdf-button-primary: var(--color-chemistry); }
    .pdf-modal[data-subject-key="law_basics"] { --pdf-button-primary: var(--color-law_basics); }
    .pdf-modal[data-subject-key="biology"] { --pdf-button-primary: var(--color-biology); }
    .pdf-modal[data-subject-key="geography"] { --pdf-button-primary: var(--color-geography); }
    .pdf-modal[data-subject-key="english"] { --pdf-button-primary: var(--color-english); }
    .pdf-modal[data-subject-key="kazakh_language"] { --pdf-button-primary: var(--color-kazakh_language); }
    .pdf-modal[data-subject-key="kazakh_literature"] { --pdf-button-primary: var(--color-kazakh_literature); }
    .pdf-modal[data-subject-key="default"] { --pdf-button-primary: var(--color-default); }

/* Түстерді фонға қолдану */
.cover-history { background-color: var(--color-history); }
.cover-world_history { background-color: var(--color-world_history); }
.cover-informatics { background-color: var(--color-informatics); }
.cover-physics { background-color: var(--color-physics); }
.cover-chemistry { background-color: var(--color-chemistry); }
.cover-law_basics { background-color: var(--color-law_basics); }
.cover-biology { background-color: var(--color-biology); }
.cover-geography { background-color: var(--color-geography); }
.cover-english { background-color: var(--color-english); }
.cover-kazakh_language { background-color: var(--color-kazakh_language); }
.cover-kazakh_literature { background-color: var(--color-kazakh_literature); }
.cover-default { background-color: var(--color-default); }


.cover-grade {
    font-size: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.1) 100%);
    backdrop-filter: blur(10px);
    padding: 8px 16px;
    border-radius: 20px;
    align-self: flex-start;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    position: relative;
    z-index: 2;
}

.cover-title {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0;
    position: relative;
    z-index: 2;
    text-shadow: 
        0 2px 4px rgba(0,0,0,0.3),
        0 4px 8px rgba(0,0,0,0.2),
        0 8px 16px rgba(0,0,0,0.1);
}

/* Ұзын атаулар үшін кіші өлшем */
.cover-title.long-title {
    font-size: 1.5rem;
}

.cover-title.very-long-title {
    font-size: 1.3rem;
}

.cover-publisher {
    font-size: 1.1rem;
    font-weight: 600;
    opacity: 0.9;
    position: relative;
    z-index: 2;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    backdrop-filter: blur(5px);
    padding: 8px 12px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
    align-self: flex-start;
}

.book-details {
    padding: 20px 25px 25px 25px;
    background: linear-gradient(145deg, #ffffff 0%, #fafbfc 100%);
    flex-grow: 1;
    position: relative;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.book-details::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0,0,0,0.1) 50%, transparent 100%);
}

.book-details .authors {
    font-size: 0.95rem;
    color: #718096;
    margin: 0;
    font-weight: 500;
    /* Авторларды толық көрсету үшін line-clamp алып тастаймыз */
    line-height: 1.4;
    text-align: center;
    padding: 5px 0;
}

/* PDF Viewer стильдері - Жаңартылған */
.pdf-modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    overscroll-behavior: contain;
}

.pdf-modal-content {
    /* Fullscreen transparent container over dark overlay */
    position: relative;
    background-color: transparent;
    width: 100%;
    max-width: none;
    height: 100vh;
    border-radius: 0;
    display: flex;
    flex-direction: column;
    box-shadow: none;
    overflow: hidden;
}

.pdf-header { display: none; }

#pdf-title { display: none; }

.close-btn {
    position: fixed;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border: 1.5px solid rgba(255, 255, 255, 0.65); /* circular line */
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    border-radius: 50%;
    cursor: pointer;
    display: inline-flex; /* allow perfect centering */
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, transform 0.1s ease, border-color 0.2s ease;
    z-index: 1002;
    box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}

.close-btn svg {
    width: 22px;
    height: 22px;
    display: block;
}

.close-btn:hover { background: rgba(0, 0, 0, 0.7); border-color: rgba(255,255,255,0.8); }
.close-btn:active { transform: scale(0.95); }

.pdf-body {
    flex-grow: 1;
    overflow: auto;
    background-color: transparent; /* Only canvas is visible over dark overlay */
    padding: 0;
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: #555 transparent;
}

.pdf-body::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.pdf-body::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.pdf-body::-webkit-scrollbar-thumb {
    background: #bbb;
    border-radius: 4px;
}

.pdf-body::-webkit-scrollbar-thumb:hover {
    background: #999;
}

#viewer-container {
    display: flex;
    justify-content: center;
    align-items: center; /* center the page vertically */
    min-height: 100%;
    position: relative;
    transition: transform 0.3s ease;
    padding: 24px 0 96px; /* space for top close and bottom controls */
}

#pdf-canvas {
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    transition: transform 0.3s ease;
    border-radius: 6px;
    background-color: #fff;
}

/* Жаңа PDF зум контейнері */
.zoom-container { display: none !important; }

.zoom-button {
    width: 40px;
    height: 40px;
    border: none;
    background-color: transparent;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--pdf-text);
    font-size: 1.5rem;
    transition: background-color 0.2s;
}

.zoom-button:hover {
    background-color: var(--pdf-controls-hover);
}

.zoom-level {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
    color: var(--pdf-text);
    width: 60px;
}

.pdf-footer {
    position: fixed;
    left: 50%;
    bottom: calc( max(14px, env(safe-area-inset-bottom) + 8px) );
    transform: translateX(-50%);
    display: grid;
    grid-template-columns: auto auto auto;
    grid-template-areas: 'prev page next';
    align-items: center;
    justify-items: center;
    padding: 0; /* no panel padding */
    gap: clamp(8px, 2.5vw, 14px);
    background: transparent;
    border: none;
    box-shadow: none;
    z-index: 1001;
}

/* Раскладка элементов по областям */
#prev-page { grid-area: prev; }
.page-info { grid-area: page; }
#next-page { grid-area: next; }

.pdf-controls-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-footer .nav-btn {
    background: transparent; /* no background fill */
    border: 1.5px solid rgba(255,255,255,0.65); /* circular outline */
    color: #fff;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    width: clamp(36px, 9vw, 52px);
    height: clamp(36px, 9vw, 52px);
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s, border-color 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.pdf-footer .nav-btn:hover:not(:disabled) { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.85); }

.pdf-footer .nav-btn:active:not(:disabled) { transform: scale(0.95); }

.pdf-footer .nav-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.pdf-footer .nav-btn svg { width: clamp(18px, 5.2vw, 26px); height: clamp(18px, 5.2vw, 26px); display: block; }

/* Масштабтау батырмалары */
.zoom-controls { display: none !important; }

.zoom-btn {
    background: var(--pdf-controls-bg);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    transition: background-color 0.2s;
}

.zoom-btn:hover {
    background-color: var(--pdf-controls-hover);
}

.zoom-info { display: none !important; }

/* Бет навигациясы */
.page-info {
    display: flex;
    align-items: center;
    font-size: 1rem;
    font-weight: 500;
    color: #fff;
}

.page-input {
    width: 64px;
    text-align: center;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.2);
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0 8px;
    background: rgba(255,255,255,0.1);
    color: #fff;
    transition: all 0.2s ease;
    box-shadow: none;
}

.page-input:hover { border-color: rgba(255,255,255,0.35); }

.page-input:focus {
    outline: none;
    border-color: rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.15);
}

.page-count {
    margin-left: 5px;
}

/* Жүктеу индикаторы */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 50px;
    font-size: 1.2rem;
    color: #eee;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 5;
}

.spinner {
    border: 4px solid rgba(0,0,0,0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border-left-color: var(--pdf-button-primary);
    margin-bottom: 15px;
    animation: spin 1s linear infinite;
}

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

/* Прогресс индикатор стилі */
.progress-container {
    width: 100%;
    max-width: 300px;
    height: 8px;
    background-color: #f1f1f1;
    border-radius: 4px;
    margin: 15px 0;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--pdf-button-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

#loading-progress {
    font-size: 1rem;
    font-weight: bold;
    color: #555;
    margin-top: 8px;
}

/* Мобильді құрылғылар үшін адаптивтік */
@media (max-width: 768px) {
    .reading-title {
        font-size: 2rem;
    }
    
    .subject-title {
        font-size: 1.5rem;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
        gap: 1.8rem;
    }
    
    .book-cover {
        height: 260px;
        padding: 18px;
    }
    
    .cover-title {
        font-size: 1.6rem;
    }
    
    .cover-title.long-title {
        font-size: 1.2rem;
    }
    
    .cover-title.very-long-title {
        font-size: 1.1rem;
    }
    
    .cover-grade {
        font-size: 0.9rem;
        padding: 6px 12px;
    }
    
    .cover-publisher {
        font-size: 0.95rem;
        padding: 6px 10px;
    }
    
    .pdf-modal-content { width: 100%; height: 100%; border-radius: 0; }
    
    .pdf-header {
        padding: 12px 15px;
    }
    
    .pdf-footer { gap: 10px; }
    
    .pdf-footer .nav-btn {
        width: 40px;
        height: 40px;
    }
    
    .page-info {
        font-size: 0.9rem;
    }
    
    .page-input {
        width: clamp(40px, 12vw, 64px);
        text-align: center;
        padding: 6px 10px;
    }

    .zoom-container { display: none; }
    
    .zoom-button {
        width: 36px;
        height: 36px;
    }
    
    /* Кішкентай экрандарда zoom панелі PDF үстінде көрсетілмейді */
    .zoom-controls {
        display: none;
    }
    
    /* Мобильді опциялар панелі көрсетіледі */
    .mobile-options {
        display: flex;
        position: fixed;
        bottom: 20px;
        right: 20px;
        background-color: rgba(255, 255, 255, 0.9);
        border-radius: 30px;
        padding: 8px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        z-index: 1001;
    }
    
    /* PDF режимінде ғана көрсетіледі */
    .mobile-options {
        display: none;
    }
    
    .pdf-modal[style*="display: flex"] + .mobile-options {
        display: flex;
    }

    #pdf-canvas {
        width: 100% !important;
        height: auto !important;
        max-width: 100vw;
        image-rendering: -webkit-optimize-contrast;
        image-rendering: optimize-contrast;
        -ms-interpolation-mode: bicubic;
    }
    
    .pdf-viewer-content { padding: 10px; overflow-x: auto; }
}

/* Кішкентай мобильді құрылғылар үшін */
@media (max-width: 480px) {
    .reading-container {
        padding: 15px;
    }
    
    .subject-filters {
        gap: 8px;
        margin-bottom: 30px;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1.5rem;
    }
    
    .book-cover {
        height: 220px;
        padding: 15px;
    }
    
    .cover-title {
        font-size: 1.4rem;
    }
    
    .cover-title.long-title {
        font-size: 1.1rem;
    }
    
    .cover-title.very-long-title {
        font-size: 1rem;
    }
    
    .cover-grade {
        font-size: 0.85rem;
        padding: 5px 10px;
    }
    
    .cover-publisher {
        font-size: 0.85rem;
        padding: 5px 8px;
    }
    
    .book-details {
        padding: 15px 18px 18px 18px;
    }
    
    .book-details .authors {
        font-size: 0.85rem;
    }
    
    /* PDF просмотрщик на малых экранах */
    .pdf-body {
        padding: 10px 0;
    }
    
    .pdf-footer { grid-template-columns: auto auto auto; }
    
    .pdf-controls-group:last-child {
        margin-top: 5px;
        width: 100%;
        justify-content: center;
    }
}

/* Альбомный режим на телефонах */
@media (max-height: 500px) and (orientation: landscape) {
    .pdf-modal-content { height: 100%; width: 100%; border-radius: 0; }
    
    .pdf-header {
        padding: 8px 15px;
    }
    
    .pdf-footer { gap: 8px; }
    
    .pdf-footer .nav-btn {
        width: 36px;
        height: 36px;
    }
}