/* ==========================================================================
   CSS Variables - Default Theme (Purple Gradient)
   These can be overridden by individual theme CSS files
   ========================================================================== */

:root {
    /* Background Colors */
    --bg-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-secondary: #f5f5f5;
    --bg-card: white;
    --bg-card-hover: white;
    --bg-glass: rgba(255, 255, 255, 0.1);
    --bg-glass-hover: rgba(255, 255, 255, 0.2);
    --bg-glass-strong: rgba(255, 255, 255, 0.3);

    /* Text Colors */
    --text-primary: #333;
    --text-secondary: #666;
    --text-light: white;
    --text-muted: #999;

    /* Brand Colors */
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --navbar-bg: #667eea;

    /* Typography */
    --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: 'Courier New', monospace;

    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 15px rgba(0, 0, 0, 0.2);
    --border-radius-sm: 8px;
    --border-radius-md: 10px;
    --border-radius-lg: 12px;
    --border-radius-xl: 25px;
    --transition-speed: 0.3s;

    /* Borders */
    --border-color: #ddd;
    --border-width: 1px;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* File Icons */
.file-icon {
    width: 19px;
    height: 28px;
    vertical-align: middle;
    margin-right: 2px;
}

/* Common Navigation Bar Styles */
.navbar-custom {
    background-color: var(--navbar-bg);
    border: none;
    border-radius: 0;
    margin-bottom: 0;
}

.navbar-custom .navbar-brand,
.navbar-custom .navbar-nav > li > a {
    color: white;
}

.navbar-custom .navbar-nav > li > a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-custom .navbar-brand:hover {
    color: white;
}

/* Search Bar - Common across pages */
.search-bar {
    padding: 10px 20px;
    background-color: #f5f5f5;
    border-bottom: 1px solid #ddd;
}

.search-bar .row {
    display: flex;
    align-items: center;
}

.search-bar #book-count {
    line-height: 34px;
}

body.dark-theme .search-bar {
    background-color: #2a2a2a;
    border-bottom-color: #444;
}

/* Dark Mode - Modal Dialogs */
body.dark-theme .modal-content {
    background-color: #2a2a2a;
    color: #e0e0e0;
}

body.dark-theme .modal-header {
    border-bottom-color: #444;
}

body.dark-theme .close {
    color: #e0e0e0;
    opacity: 0.8;
}

/* Dark Mode - Form Controls */
body.dark-theme .form-control {
    background-color: #333;
    color: #e0e0e0;
    border-color: #444;
}

body.dark-theme .form-control:focus {
    background-color: #3a3a3a;
    color: #e0e0e0;
    border-color: #667eea;
}

/* Dark Mode - Tables */
body.dark-theme .table {
    color: #e0e0e0;
}

body.dark-theme .table > thead > tr > th {
    background-color: #2a2a2a;
    color: #e0e0e0;
    border-color: #444;
}

body.dark-theme .table > tbody > tr {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

body.dark-theme .table-striped > tbody > tr:nth-of-type(odd) {
    background-color: #1a1a1a;
}

body.dark-theme .table-striped > tbody > tr:nth-of-type(even) {
    background-color: #242424;
}

body.dark-theme .table-hover > tbody > tr:hover {
    background-color: #333;
}

body.dark-theme .table > tbody > tr > td,
body.dark-theme .table > thead > tr > th {
    border-color: #444;
}

/* ==========================================================================
   Index Page Styles
   ========================================================================== */

.index-body {
    padding: 40px 20px;
    min-height: 100vh;
}

.header {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 30px;
}

.header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    font-weight: 300;
    font-family: var(--font-display);
}

.header p {
    font-size: 1.2em;
    opacity: 0.9;
}

.stats {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-md);
    padding: 20px;
    margin-bottom: 30px;
    color: var(--text-light);
    text-align: center;
}

.stats h3 {
    margin-top: 0;
    font-weight: 300;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.stat-item {
    background: var(--bg-glass);
    padding: 15px;
    border-radius: var(--border-radius-sm);
}

.stat-number {
    font-size: 2em;
    font-weight: bold;
    display: block;
}

.stat-label {
    font-size: 0.9em;
    opacity: 0.8;
    margin-top: 5px;
}

.view-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.view-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    text-align: center;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.view-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
    color: var(--text-primary);
}

.view-card .icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.view-card h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-family: var(--font-display);
}

.view-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer {
    text-align: center;
    color: var(--text-light);
    margin-top: 50px;
    opacity: 0.8;
}

.footer a {
    color: var(--text-light);
    text-decoration: underline;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-glass-hover);
    backdrop-filter: blur(10px);
    border: var(--border-width) solid var(--bg-glass-strong);
    color: var(--text-light);
    padding: 10px 20px;
    border-radius: var(--border-radius-xl);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.theme-toggle:hover {
    background: var(--bg-glass-strong);
}

/* Theme Selector Dropdown (Index Page) */
.theme-selector-dropdown {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
}

.theme-dropdown-btn {
    background: var(--bg-glass-hover);
    backdrop-filter: blur(10px);
    border: var(--border-width) solid var(--bg-glass-strong);
    color: var(--text-light);
    padding: 10px 20px;
    border-radius: var(--border-radius-xl);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-size: 14px;
    font-family: var(--font-body);
}

.theme-dropdown-btn:hover {
    background: var(--bg-glass-strong);
}

.theme-dropdown-content {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    background: var(--bg-card);
    min-width: 160px;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    z-index: 1001;
}

.theme-dropdown-content.show {
    display: block;
}

.theme-dropdown-content a {
    color: var(--text-primary);
    padding: 12px 16px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background-color 0.2s ease;
}

.theme-dropdown-content a:hover {
    background-color: var(--bg-secondary);
}

.theme-dropdown-content a.active {
    background-color: var(--bg-secondary);
    font-weight: bold;
}

.theme-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

/* Dark mode adjustments for dropdown */
body.dark-theme .theme-dropdown-content {
    background: #2a2a2a;
}

body.dark-theme .theme-dropdown-content a {
    color: #e0e0e0;
}

body.dark-theme .theme-dropdown-content a:hover {
    background-color: #333;
}


/* Dark theme adjustments for index page */
body.dark-theme.index-body {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}