/* Crypto Book Viewer Styles */

/* Root Variables */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #059669;
    --success-hover: #047857;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --warning-color: #d97706;
    --warning-hover: #b45309;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

/* Text Alignment Utility Classes */
.text-left {
    text-align: left !important;
}

.text-center {
    text-align: center !important;
}

.text-right {
    text-align: right !important;
}

.text-justify {
    text-align: justify !important;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: var(--surface);
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid var(--border);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Stats Bar */
.stats-bar {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 16px;
}

.stat-item {
    text-align: center;
    flex: 1;
    min-width: 120px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Upload Section */
.upload-section {
    background: var(--surface);
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    border: 2px dashed var(--border);
    transition: all 0.3s ease;
}

.upload-section:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.upload-area {
    text-align: center;
    padding: 32px;
    border-radius: 12px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.6;
}

.upload-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    line-height: 1;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-danger:hover {
    background: var(--danger-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-warning:hover {
    background: var(--warning-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.75rem;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.book-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
    overflow-x: hidden;
    overflow-y: visible;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

.book-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
}

.book-icon {
    font-size: 2.5rem;
    opacity: 0.8;
    flex-shrink: 0;
}

.book-info {
    flex: 1;
}

.book-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text-primary);
    line-height: 1.3;
}

.book-author {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 8px;
}

.book-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.book-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.book-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Bookmark Dropdown */
.bookmark-group {
    position: relative;
    display: flex;
    z-index: 1000;
}

.bookmark-dropdown-btn {
    background: var(--success-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    font-size: 0.75rem;
    margin-left: -1px;
    transition: background-color 0.2s ease;
}

.bookmark-dropdown-btn:hover {
    background: var(--success-hover);
}

.bookmark-btn {
    border-radius: 8px 0 0 8px !important;
}

.bookmarks-dropdown {
    position: fixed;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 999999;
    min-width: 300px;
    max-height: 300px;
    overflow-y: auto;
    /* Display controlled by JavaScript inline styles */
    pointer-events: auto; /* Ensure it can receive mouse events */
    user-select: none; /* Prevent text selection issues */
}

.bookmarks-dropdown.show {
    display: block !important;
}

.bookmarks-dropdown.dropdown-up {
    /* Additional styling for when dropdown appears above the button */
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}

.bookmarks-dropdown * {
    pointer-events: auto; /* Ensure all child elements can receive events */
}

.bookmark-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.bookmark-item:hover {
    background-color: #f8fafc;
}

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

.bookmark-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.bookmark-chapter {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* Enhanced Bookmark Dropdown Styles */
.bookmarks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border);
    background: #f8f9fa;
    border-radius: 8px 8px 0 0;
}

.bookmarks-header h4 {
    margin: 0;
    font-size: 14px;
    color: var(--text-primary);
}

.close-dropdown {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: #666;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
}

.close-dropdown:hover {
    background: #e9ecef;
    color: #333;
}

.bookmarks-list {
    padding: 10px 0;
}

.bookmark-info {
    flex: 1;
    min-width: 0;
}

.bookmark-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 3px;
}

.no-bookmarks {
    padding: 20px;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

/* Alerts */
.alert {
    padding: 16px;
    margin-bottom: 24px;
    border-radius: 8px;
    border-left: 4px solid;
}

.alert-success {
    background-color: #f0fdf4;
    color: #166534;
    border-left-color: var(--success-color);
}

.alert-error {
    background-color: #fef2f2;
    color: #991b1b;
    border-left-color: var(--danger-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 64px 32px;
    background: var(--surface);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.empty-state-icon {
    font-size: 4rem;
    opacity: 0.3;
    margin-bottom: 16px;
}

.empty-state-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state-text {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px;
    color: var(--text-secondary);
    background: var(--surface);
    border-radius: 16px;
    margin-top: 40px;
    box-shadow: var(--shadow);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    .header {
        padding: 24px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .books-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .stats-bar {
        flex-direction: column;
        gap: 8px;
    }

    .book-actions {
        flex-direction: column;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Drag and Drop Styles */
.upload-area.dragover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    transform: scale(1.02);
}