/* Main Viewer Styles for Secure Ebook Reader */

:root {
    /* Colors - Light Theme */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #64748b;
    --color-success: #059669;
    --color-warning: #d97706;
    --color-error: #dc2626;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-overlay: rgba(0, 0, 0, 0.5);
    
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    
    --color-border-light: #e2e8f0;
    --color-border-medium: #cbd5e1;
    --color-border-dark: #94a3b8;
    
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-medium: rgba(0, 0, 0, 0.15);
    --color-shadow-strong: rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-dyslexic: 'OpenDyslexic', sans-serif;
    --font-family-serif: Georgia, 'Times New Roman', serif;
    --font-family-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Layout */
    --header-height: 4rem;
    --sidebar-width: 16rem;
    --toc-width: 20rem;
    --thumbnails-width: 12rem;
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 300ms ease;
    
    /* Z-index levels */
    --z-dropdown: 1000;
    --z-modal: 1050;
    --z-toast: 1100;
    --z-tooltip: 1150;
}

/* Dark Theme */
[data-theme="dark"], .theme-dark {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-bg-overlay: rgba(0, 0, 0, 0.7);
    
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #64748b;
    
    --color-border-light: #334155;
    --color-border-medium: #475569;
    --color-border-dark: #64748b;
    
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-medium: rgba(0, 0, 0, 0.4);
    --color-shadow-strong: rgba(0, 0, 0, 0.6);
}

/* High Contrast Theme */
[data-theme="high-contrast"], .theme-high-contrast {
    --color-primary: #000000;
    --color-primary-hover: #333333;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f0f0f0;
    --color-bg-tertiary: #e0e0e0;
    
    --color-text-primary: #000000;
    --color-text-secondary: #000000;
    --color-text-muted: #333333;
    
    --color-border-light: #000000;
    --color-border-medium: #000000;
    --color-border-dark: #000000;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

html {
    height: 100%;
    font-size: 16px;
}

body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow: hidden;
}

/* Font Family Classes */
.font-inter { font-family: var(--font-family-primary); }
.font-dyslexic { font-family: var(--font-family-dyslexic); }
.font-serif { font-family: var(--font-family-serif); }
.font-mono { font-family: var(--font-family-mono); }

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    width: 3rem;
    height: 3rem;
    border: 3px solid var(--color-border-light);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.loading-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

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

/* Utility Classes */
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    min-height: 2.5rem;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
}

.btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border-color: var(--color-border-medium);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-bg-tertiary);
}

.btn-icon {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover:not(:disabled) {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.btn-icon svg {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
}

/* Main App Layout */
.app {
    display: flex;
    height: 100vh;
    flex-direction: column;
}

/* Header */
.app-header {
    height: var(--header-height);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    position: relative;
    z-index: 100;
}

.header-left,
.header-center,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-left {
    flex: 0 0 auto;
}

.header-center {
    flex: 1;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto;
}

.header-right {
    flex: 0 0 auto;
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin: 0;
    color: var(--color-text-primary);
}

/* Search Container */
.search-container {
    position: relative;
    width: 100%;
    max-width: 400px;
}

.search-container input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 3rem;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.search-container input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-btn {
    position: absolute;
    right: 0.25rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
    color: var(--color-text-secondary);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--color-shadow);
    padding: var(--spacing-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-info {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: var(--spacing-sm);
}

.user-name {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.user-email {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.dropdown-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--spacing-sm) 0;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    text-align: left;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--color-bg-secondary);
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-light);
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-nav {
    padding: var(--spacing-lg) 0;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin-bottom: var(--spacing-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.nav-link:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.nav-link.active {
    background: var(--color-primary);
    color: white;
}

.nav-link svg {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
}

/* Main Content */
.main-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* Views */
.view {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.view.active {
    opacity: 1;
    visibility: visible;
}

.view-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-bg-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.view-header h2 {
    margin: 0;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.view-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.view-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Library View */
.library-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

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

.book-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 1px 3px var(--color-shadow);
}

.book-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--color-shadow-medium);
}

.book-cover {
    aspect-ratio: 2/3;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info {
    padding: var(--spacing-md);
    flex: 1;
}

.book-title {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: var(--line-height-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    line-clamp: 2; /* Standard property for future compatibility */
    overflow: hidden;
}

.book-author {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.book-progress {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Empty and Loading States */
.loading-state,
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 300px;
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state svg {
    width: 4rem;
    height: 4rem;
    margin-bottom: var(--spacing-md);
    fill: var(--color-text-muted);
}

.empty-state h3 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--color-text-primary);
}

.empty-state p {
    margin: 0;
    color: var(--color-text-secondary);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-md);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Error Messages */
.error-message {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: rgba(220, 38, 38, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(220, 38, 38, 0.2);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        height: calc(100vh - var(--header-height));
        z-index: 99;
        transition: left var(--transition-normal);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .header-center {
        flex: 1;
        max-width: none;
    }
    
    .search-container {
        max-width: 300px;
    }
}

@media (max-width: 768px) {
    .header-left .app-title {
        display: none;
    }
    
    .search-container {
        max-width: 200px;
    }
    
    .library-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }
}

@media (max-width: 640px) {
    .app-header {
        padding: 0 var(--spacing-md);
    }
    
    .view-header {
        padding: var(--spacing-md);
    }
    
    .library-content {
        padding: var(--spacing-md);
    }
    
    .library-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}