/* Variables CSS */
:root {
    /* Colors Light Mode */
    --primary: #259EB0;
    --primary-dark: #1e8090;
    --primary-light: #3db8ca;
    --background: #ffffff;
    --surface: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Category Colors */
    --cat-base: #8b5cf6;
    --cat-image: #ec4899;
    --cat-video: #f59e0b;
    --cat-audio: #10b981;
    --cat-workflow: #3b82f6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
    --primary: #3db8ca;
    --primary-dark: #259EB0;
    --primary-light: #5fd4e6;
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
}

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

.logo-icon {
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #259EB0, #3db8ca);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.theme-toggle {
    background: none;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    width: 48px;
    height: 48px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition);
    position: relative;
}

.theme-toggle:hover {
    background-color: var(--surface);
    border-color: var(--primary);
    transform: scale(1.05);
}

.theme-toggle .sun,
.theme-toggle .moon {
    position: absolute;
    transition: var(--transition);
}

[data-theme="light"] .moon {
    opacity: 0;
    transform: scale(0);
}

[data-theme="dark"] .sun {
    opacity: 0;
    transform: scale(0);
}

/* Hero Section */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #259EB0, #3db8ca);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

/* Search */
.search-container {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--spacing-lg);
    font-size: 1.25rem;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) 3.5rem;
    font-size: 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-xl);
    background-color: var(--surface);
    color: var(--text-primary);
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.clear-search {
    position: absolute;
    right: var(--spacing-md);
    background: var(--text-secondary);
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.clear-search:hover {
    background: var(--text-primary);
    transform: scale(1.1);
}

/* Filters */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    background-color: var(--surface);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.filter-btn.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: var(--background);
}

.filter-icon {
    font-size: 1.25rem;
}

/* Results Info */
.results-info {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
}

#resultsCount {
    font-weight: 700;
    color: var(--primary);
}

/* Terms Grid */
.main {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
    min-height: 60vh;
}

.terms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Term Card */
.term-card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.term-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.term-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-hover);
}

.term-card:hover::before {
    transform: scaleX(1);
}

.term-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.term-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.term-title-wrapper {
    flex: 1;
}

.term-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 0.25rem;
}

.term-en {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
    margin: 0;
    font-weight: 400;
}

.term-category {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.25rem 0.75rem;
    background-color: var(--primary);
    color: var(--background); 
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.term-definition {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.term-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.term-examples,
.term-analogy {
    font-size: 0.875rem;
    padding: var(--spacing-sm);
    background-color: var(--background);
    border-left: 3px solid var(--primary);
    border-radius: var(--radius-sm);
}

.term-examples strong,
.term-analogy strong {
    color: var(--primary);
    font-weight: 600;
}

.term-examples {
    color: var(--text-secondary);
}

.term-analogy {
    color: var(--text-secondary);
    font-style: italic;
}

/* Copy Button */
.copy-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
    font-size: 1rem;
}

.term-card:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: scale(1.1);
}

.copy-btn.copied {
    background-color: var(--cat-audio);
    border-color: var(--cat-audio);
    color: white;
}

/* No Results */
.no-results {
    text-align: center;
    padding: var(--spacing-2xl);
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.no-results p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.separator {
    color: var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .terms-grid {
        grid-template-columns: 1fr;
    }
    
    .filters {
        gap: var(--spacing-xs);
    }
    
    .filter-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }
    
    .footer-content {
        font-size: 0.875rem;
    }
}

/* Highlight matched text */
.highlight {
    background-color: rgba(99, 102, 241, 0.2);
    padding: 0 0.2rem;
    border-radius: 0.25rem;
    font-weight: 600;
}

/* Loading animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading .term-card {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Action Button */
.term-action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--primary);
    color: var(--background); 
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-sm);
}

.term-action-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 158, 176, 0.3);
}

.term-action-btn::after {
    content: '→';
    font-size: 1rem;
}