@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@300;400;600;700&family=Noto+Sans+Arabic:wght@300;400;600;700&display=swap');

:root {
    /* Color Palette - Moroccan/Islamic Inspired */
    --primary-color: #0d3b66;
    /* Deep Ocean Blue */
    --secondary-color: #c45b42;
    /* Terracotta */
    --accent-color: #e6b85c;
    /* Gold/Sand */
    --bg-color: #fcfbf7;
    /* Off-white/Paper */
    --card-bg: #ffffff;
    --text-color: #2d2d2d;
    --text-light: #666666;
    --border-color: #e0e0e0;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Cairo', 'Noto Sans Arabic', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    direction: rtl;
    /* Global Right-to-Left */
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Subtle geometric pattern background could be added here */
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

a {
    text-decoration: none;
    color: inherit;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

/* Header */
header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--accent-color);
    /* Moroccan Pattern Overlay */
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c45b42' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text h1 {
    font-size: 1.8rem;
    margin-bottom: 0;
    color: var(--primary-color);
}

.logo-text p {
    font-size: 0.9rem;
    color: var(--secondary-color);
    font-weight: 600;
}

/* Search Bar */
.search-container {
    flex-grow: 1;
    max-width: 500px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
    padding-right: 40px;
    /* Space for icon */
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(196, 91, 66, 0.1);
}

.search-icon {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    pointer-events: none;
}

/* Main Content */
main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* Controls / Filter Bar */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.sort-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    background-color: var(--card-bg);
    cursor: pointer;
}

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

/* Book Card */
.book-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-medium);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid transparent;
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.card-image {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    background-color: #eee;
    /* geometric pattern placeholder */
    background-image: repeating-linear-gradient(45deg, #f0f0f0 0, #f0f0f0 10px, #ffffff 10px, #ffffff 20px);
}

.card-content {
    padding: var(--spacing-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 1.1rem;
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.book-category {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
    text-align: center;
}

/* Book Reader Page */
.reader-layout {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 100px);
    /* Adjust based on header */
    gap: var(--spacing-md);
}

.reader-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.back-button:hover {
    background-color: #f0f4f8;
}

.download-btn {
    background-color: var(--secondary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.download-btn:hover {
    background-color: #a34833;
    transform: translateY(-2px);
}

#pdf-container {
    flex-grow: 1;
    background-color: #525659;
    /* PDF Viewer default grey */
    border-radius: var(--radius-md);
    overflow: auto;
    position: relative;
    display: flex;
    justify-content: center;
}

.pdf-viewer {
    box-shadow: var(--shadow-lg);
    margin: var(--spacing-md) auto;
}

.toolbar {
    background-color: #333;
    color: white;
    padding: var(--spacing-sm);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    align-items: center;
    border-radius: var(--radius-md);
}

.toolbar button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}

.toolbar button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Loading Spinner */
.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--secondary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 50px auto;
}

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

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }

    .search-container {
        max-width: 100%;
        margin-top: var(--spacing-sm);
    }

    .book-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .book-grid {
        grid-template-columns: 1fr;
    }
}