/* =================================================================
   CEBUANO LEARNING PLATFORM - CORE STYLES
   Version 3.1 - November 2025
   Shared base styles, variables, components
   ================================================================= */

:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #E0E7FF;
    --secondary: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --success: #10B981;
    --success-light: #D1FAE5;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --spacing-base: 16px;
    --spacing-small: 8px;
    --spacing-large: 24px;
}

[data-theme="dark"] {
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #312E81;
    --success-light: #064E3B;
    --bg-primary: #1F2937;
    --bg-secondary: #111827;
    --bg-tertiary: #374151;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --border-color: #374151;
    --gray-100: #374151;
    --gray-200: #4B5563;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* =================================================================
   HEADER
   ================================================================= */

.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.header-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-title h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-image {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.version-badge {
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

/* Version badge responsive display */
.version-inline-mobile {
    display: none; /* Hidden by default, shown on mobile */
}

.version-desktop {
    display: inline-block; /* Shown by default, hidden on mobile */
}

/* =================================================================
   CONSTRUCTION BANNER
   ================================================================= */

.construction-banner {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #1a1a1a;
    text-align: center;
    padding: 12px 20px;
    font-weight: 700;
    font-size: 16px;
    border-top: 3px solid #ff6b00;
    border-bottom: 3px solid #ff6b00;
    box-shadow: 0 2px 8px rgba(255, 107, 0, 0.3);
    letter-spacing: 2px;
    margin-bottom: 0;
}

.construction-banner i {
    margin: 0 12px;
    animation: pulse-warning 1.5s ease-in-out infinite;
}

@keyframes pulse-warning {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.language-selector,
.lesson-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.language-selector label,
.lesson-selector label {
    color: var(--text-secondary);
    font-size: 16px;
}

.select-control {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 150px;
}

.select-control:hover {
    background: var(--gray-100);
    border-color: var(--primary);
}

.select-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
}

.theme-toggle:hover {
    background: var(--gray-100);
}

/* Login Button in Header */
.login-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    font-weight: 500;
    transition: all 0.2s;
    margin-left: 8px;
}

.login-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    filter: brightness(1.1);
}

.login-btn.hidden {
    display: none;
}

/* =================================================================
   README FLOATING BADGE
   ================================================================= */

.readme-floating-badge {
    position: fixed;
    top: 100px;
    right: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    padding: 20px;
    max-width: 320px;
    width: 100%;
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.readme-floating-badge.hidden {
    opacity: 0;
    transform: translateX(400px);
    pointer-events: none;
}

.readme-floating-badge.show {
    opacity: 1;
    transform: translateX(0);
}

.readme-badge-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.readme-badge-pulse {
    width: 12px;
    height: 12px;
    background: #dc2626;
    border-radius: 50%;
    position: relative;
    flex-shrink: 0;
    margin-top: 2px;
    animation: readme-pulse 2s ease-in-out infinite;
}

@keyframes readme-pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

.readme-badge-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    flex: 1;
    line-height: 1.4;
}

.readme-badge-close {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    font-size: 16px;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.readme-badge-close:hover {
    color: #4b5563;
}

.readme-badge-content {
    margin-bottom: 16px;
}

.readme-badge-content p {
    font-size: 14px;
    color: #6b7280;
    line-height: 1.5;
    margin: 0;
}

.readme-badge-btn-primary,
.readme-badge-btn-agree {
    width: 100%;
    border: none;
    padding: 12px;
    border-radius: 6px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.readme-badge-btn-primary {
    background: #dc2626;
    color: #fbbf24;
    margin-bottom: 8px;
}

.readme-badge-btn-primary:hover {
    background: #b91c1c;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(220, 38, 38, 0.3);
}

.readme-badge-btn-primary:active {
    transform: translateY(0);
}

.readme-badge-btn-agree {
    background: #16a34a;
    color: white;
}

.readme-badge-btn-agree:hover {
    background: #15803d;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(22, 163, 74, 0.3);
}

.readme-badge-btn-agree:active {
    transform: translateY(0);
}

/* Dark mode adjustments */
[data-theme="dark"] .readme-floating-badge {
    background: #1f2937;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .readme-badge-header h3 {
    color: #f9fafb;
}

[data-theme="dark"] .readme-badge-content p {
    color: #9ca3af;
}

[data-theme="dark"] .readme-badge-close {
    color: #6b7280;
}

[data-theme="dark"] .readme-badge-close:hover {
    color: #9ca3af;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .readme-floating-badge {
        top: auto;
        bottom: 20px;
        right: 20px;
        left: 20px;
        max-width: none;
    }

    .readme-floating-badge.hidden {
        transform: translateY(400px);
    }
}

/* =================================================================
   NAVIGATION TABS
   ================================================================= */

.container {
    max-width: 95%;
    width: 95%;
    margin: 0 auto;
    padding: 0 20px 40px;
}

.nav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
}

.nav-tab {
    background: transparent;
    border: none;
    padding: 12px 18px;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.nav-tab:hover {
    color: var(--primary);
}

.nav-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Two-level navigation styles */
.nav-level-2 {
    background: var(--bg-tertiary);
    border-radius: 8px 8px 0 0;
    padding: 4px 4px 0;
}

.nav-tab.nav-back {
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-right: 8px;
    padding: 10px 16px;
    border-bottom: none;
    margin-bottom: 0;
}

.nav-tab.nav-back:hover {
    background: var(--gray-200);
    color: var(--text-primary);
}

.nav-tab.nav-category {
    position: relative;
}

.nav-tab.nav-category::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 10px;
    margin-left: 4px;
    opacity: 0.6;
}

/* Coming Soon Badge */
.nav-tab.coming-soon {
    position: relative;
    opacity: 0.7;
    cursor: default;
    overflow: hidden;
}

.coming-soon-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-15deg);
    background: linear-gradient(135deg, #ff6b6b, #ee5a5a);
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 6px rgba(238, 90, 90, 0.4);
    white-space: nowrap;
    z-index: 1;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =================================================================
   MOBILE NAVIGATION (Hamburger Menu)
   ================================================================= */

.mobile-nav-toggle {
    display: none;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 20px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px 12px;
    transition: all 0.2s ease;
    margin-right: 8px;
}

.mobile-nav-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.05);
}

.mobile-nav-toggle:active {
    transform: scale(0.95);
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    left: -300px;
    width: 280px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.15);
    transition: left 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.mobile-nav-menu.open {
    left: 0;
}

.mobile-nav-header {
    background: var(--primary);
    color: white;
    padding: 20px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mobile-nav-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.mobile-nav-close {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
}

.mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.2s;
}

.mobile-nav-item:hover {
    background: var(--bg-secondary);
}

.mobile-nav-item.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}

.mobile-nav-item i {
    width: 20px;
    text-align: center;
    color: var(--text-secondary);
}

.mobile-nav-item.active i {
    color: var(--primary);
}

.mobile-nav-item .fa-chevron-right {
    margin-left: auto;
    font-size: 12px;
    opacity: 0.5;
}

/* Mobile nav chevron for expandable categories */
.mobile-nav-chevron {
    margin-left: auto;
    font-size: 14px;
    transition: transform 0.3s ease;
}

.mobile-nav-category.expanded .mobile-nav-chevron {
    transform: rotate(180deg);
}

/* Mobile nav submenu (expandable) */
.mobile-nav-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: var(--bg-secondary);
}

.mobile-nav-submenu.expanded {
    max-height: 500px;
}

/* Sub-items with indentation */
.mobile-nav-subitem {
    padding-left: 48px;
    background: var(--bg-secondary);
    font-size: 14px;
}

.mobile-nav-subitem:hover {
    background: var(--bg-hover);
}

/* Coming soon styling for mobile menu items */
.mobile-nav-item.coming-soon {
    opacity: 0.6;
    cursor: default;
    position: relative;
}

.coming-soon-badge-mobile {
    margin-left: auto;
    padding: 2px 8px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a5a);
    color: white;
    font-size: 10px;
    font-weight: 700;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 999;
}

.mobile-nav-overlay.show {
    opacity: 1;
    pointer-events: all;
}

/* Mobile styles - hamburger menu only */
@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .nav-tabs {
        display: none !important;
    }

    .header-title h1 {
        font-size: 16px;
    }

    .header-controls {
        gap: 8px;
        flex-wrap: wrap;
    }

    /* Version badge responsive behavior */
    .version-desktop {
        display: none !important; /* Hide desktop version on mobile */
    }

    .version-inline-mobile {
        display: inline !important; /* Show inline version on mobile */
        margin-left: 6px;
        font-size: 10px;
        padding: 2px 8px;
    }
}

/* Dark mode adjustments */
[data-theme="dark"] .mobile-nav-menu {
    background: var(--bg-secondary);
}

[data-theme="dark"] .mobile-nav-item:hover {
    background: var(--bg-tertiary);
}

[data-theme="dark"] .mobile-nav-item.active {
    background: var(--primary-light);
}

/* =================================================================
   CARDS
   ================================================================= */

.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.card-description {
    font-size: 14px;
    color: var(--text-secondary);
}

/* =================================================================
   BUTTONS
   ================================================================= */

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

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

.btn-primary:disabled {
    background: var(--gray-200);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--gray-100);
}

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

.btn-success:hover {
    opacity: 0.9;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* START AND RESTART BUTTONS */
#startBtn,
button[id*="restart"],
button[id*="Restart"] {
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}

#startBtn:hover,
button[id*="restart"]:hover,
button[id*="Restart"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

#startBtn:active,
button[id*="restart"]:active,
button[id*="Restart"]:active {
    transform: translateY(0);
}

.btn-secondary[id*="restart"],
.btn-secondary[id*="Restart"] {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 14px 28px;
    font-size: 16px;
}

.btn-secondary[id*="restart"]:hover,
.btn-secondary[id*="Restart"]:hover {
    background: #0ea572;
    transform: translateY(-2px);
}

/* =================================================================
   FORMS
   ================================================================= */

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 12px 0;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-group label {
    cursor: pointer;
    font-size: 14px;
    user-select: none;
}

/* =================================================================
   MODALS
   ================================================================= */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

.modal-content.large {
    max-width: 900px;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

/* =================================================================
   SCAN MODAL
   ================================================================= */

.scan-section {
    padding: 24px;
}

.scan-section.hidden {
    display: none;
}

.scan-message {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 16px;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}

.stat-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 12px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    display: block;
    margin: 8px 0;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.validation-list {
    max-height: 200px;
    overflow-y: auto;
}

.validation-item {
    padding: 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    background: var(--bg-secondary);
    border-left: 4px solid var(--warning);
}

.validation-item.error {
    border-left-color: var(--error);
}

.validation-item.success {
    border-left-color: var(--success);
}

.no-issues {
    text-align: center;
    padding: 24px;
    color: var(--success);
    font-weight: 500;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
    max-height: 400px;
    overflow-y: auto;
}

.preview-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
    transition: all 0.2s;
}

.preview-card:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.preview-card img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 8px;
}

.preview-card .cebuano {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.preview-card .english {
    font-size: 11px;
    color: var(--text-secondary);
}

.preview-card .audio-indicator {
    margin-top: 4px;
    font-size: 14px;
}

.action-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
}

/* =================================================================
   TOAST NOTIFICATIONS
   ================================================================= */

.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast-icon {
    font-size: 20px;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.warning .toast-icon {
    color: var(--warning);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.toast-message {
    font-size: 13px;
    color: var(--text-secondary);
}

/* =================================================================
   EMPTY STATE
   ================================================================= */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 64px;
    color: var(--gray-200);
    margin-bottom: 16px;
    display: block;
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 24px;
}

.empty-state.error i {
    color: var(--error);
}

/* =================================================================
   INSTRUCTION MODAL
   ================================================================= */

.instruction-modal {
    max-width: 500px;
    text-align: center;
}

.instruction-modal .modal-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px;
    border-radius: 12px 12px 0 0;
}

.instruction-modal .modal-header h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 600;
}

.instruction-body {
    padding: 32px 24px;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

.instruction-body p {
    margin: 0;
}

.instruction-footer {
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-radius: 0 0 12px 12px;
}

.instruction-footer .btn {
    min-width: 150px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
}

/* =================================================================
   LOGIN MODAL
   ================================================================= */

.login-modal {
    max-width: 450px;
}

.login-modal .modal-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px 24px;
    border-radius: 12px 12px 0 0;
}

.login-modal .modal-header h2 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
}

.login-modal .modal-body {
    padding: 24px;
}

.login-modal .form-group {
    margin-bottom: 0;
}

.login-error {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--error);
    padding: 12px;
    border-radius: 4px;
    color: var(--error);
    font-size: 14px;
    margin-top: 16px;
}

.login-error.hidden {
    display: none;
}

/* =================================================================
   ADVANCED FILTER MODAL
   ================================================================= */

.filter-button-container {
    display: flex;
    align-items: center;
}

#advancedFilterBtn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
}

#advancedFilterBtn:hover {
    background: var(--gray-100);
    border-color: var(--primary);
}

#advancedFilterBtn.filter-active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

#advancedFilterBtn .filter-indicator {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    display: none;
}

#advancedFilterBtn.filter-active .filter-indicator {
    display: inline-block;
}

.filter-modal {
    max-width: 600px;
    width: 95%;
}

.filter-modal .modal-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px 24px;
    border-radius: 12px 12px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.filter-modal .modal-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
}

.filter-modal .modal-header .btn-icon {
    color: white;
    opacity: 0.8;
}

.filter-modal .modal-header .btn-icon:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

.filter-modal .modal-body {
    padding: 24px;
    max-height: 60vh;
    overflow-y: auto;
}

.filter-group {
    margin-bottom: 20px;
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.filter-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-group select:hover {
    border-color: var(--primary);
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.lesson-range-row {
    display: flex;
    gap: 16px;
}

.lesson-range-row .filter-group {
    flex: 1;
    margin-bottom: 0;
}

.filter-hint {
    font-size: 12px;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 4px;
}

.filter-match-count {
    text-align: center;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-top: 20px;
    border: 1px solid var(--border-color);
}

#filterMatchCount {
    font-size: 18px;
    font-weight: 700;
    color: var(--success);
}

.filter-footer {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: 0 0 12px 12px;
}

.filter-footer .btn {
    flex: 1;
    justify-content: center;
}

.filter-section-divider {
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
    padding-top: 20px;
}

.filter-section-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

/* =================================================================
   UTILITY CLASSES
   ================================================================= */

.hidden {
    display: none !important;
}

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

.mt-1 {
    margin-top: 8px;
}

.mt-2 {
    margin-top: 16px;
}

.mb-1 {
    margin-bottom: 8px;
}

.mb-2 {
    margin-bottom: 16px;
}