/* ============================================
   ENCYCLOPEDIA STYLES
   Professional World Map Theme
   ============================================ */

/* CSS Variables */
:root {
    /* Primary Colors - Ocean/Earth Theme */
    --color-bg-primary: #0a0f1a;
    --color-bg-secondary: #0f172a;
    --color-bg-tertiary: #1e293b;
    --color-bg-card: rgba(30, 41, 59, 0.8);
    --color-bg-glass: rgba(15, 23, 42, 0.9);
    
    /* Accent Colors */
    --color-accent-blue: #3b82f6;
    --color-accent-cyan: #06b6d4;
    --color-accent-purple: #8b5cf6;
    --color-accent-green: #10b981;
    --color-accent-yellow: #fbbf24;
    --color-accent-orange: #f97316;
    --color-accent-red: #ef4444;
    --color-accent-pink: #ec4899;
    
    /* Text Colors */
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-text-accent: #38bdf8;
    
    /* Border */
    --color-border: rgba(71, 85, 105, 0.5);
    --color-border-light: rgba(148, 163, 184, 0.2);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow-blue: 0 0 30px rgba(59, 130, 246, 0.4);
    --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.4);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #06b6d4, #10b981);
    --gradient-warm: linear-gradient(135deg, #f59e0b, #ef4444);
    --gradient-cool: linear-gradient(135deg, #06b6d4, #3b82f6);
    
    /* Fonts */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-display: 'Playfair Display', serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #f1f5f9;
    --color-bg-tertiary: #e2e8f0;
    --color-bg-card: rgba(255, 255, 255, 0.9);
    --color-bg-glass: rgba(255, 255, 255, 0.95);
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-border: rgba(148, 163, 184, 0.5);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ============================================
   LOADING SCREEN
   ============================================ */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg-primary);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

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

.loading-globe {
    width: 100px;
    height: 100px;
    margin: 0 auto 30px;
    position: relative;
    border-radius: 50%;
    background: linear-gradient(135deg, #1e90ff 0%, #32cd32 50%, #1e90ff 100%);
    background-size: 200% 100%;
    animation: globeRotate 2s linear infinite;
    box-shadow: 
        0 0 60px rgba(30, 144, 255, 0.4),
        inset -15px -10px 30px rgba(0, 0, 0, 0.3);
}

.loading-globe::before {
    content: '';
    position: absolute;
    top: 10%;
    left: 10%;
    width: 30%;
    height: 20%;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    filter: blur(5px);
}

@keyframes globeRotate {
    from { background-position: 0% 0%; }
    to { background-position: 200% 0%; }
}

.loading-content h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.loading-content p {
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--color-bg-tertiary);
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    animation: loadingProgress 1.5s ease-in-out infinite;
}

@keyframes loadingProgress {
    0% { width: 0%; margin-left: 0; }
    50% { width: 70%; margin-left: 0; }
    100% { width: 0%; margin-left: 100%; }
}

/* ============================================
   BACKGROUND
   ============================================ */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 0%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
}

.bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233b82f6' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

/* ============================================
   APP CONTAINER
   ============================================ */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   HEADER
   ============================================ */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
    gap: var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-primary) 80%, transparent 100%);
}

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

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

.logo-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    box-shadow: var(--shadow-glow-blue);
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.header-center {
    flex: 1;
    max-width: 500px;
}

.search-container {
    position: relative;
}

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

.search-box input {
    width: 100%;
    padding: 12px 45px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-size: 0.95rem;
    transition: var(--transition-normal);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-glow-blue);
}

.search-box input::placeholder {
    color: var(--color-text-muted);
}

.search-icon {
    position: absolute;
    left: 16px;
    font-size: 1rem;
    pointer-events: none;
}

.search-clear {
    position: absolute;
    right: 12px;
    width: 24px;
    height: 24px;
    background: var(--color-bg-tertiary);
    border: none;
    border-radius: 50%;
    color: var(--color-text-muted);
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition-fast);
}

.search-box input:not(:placeholder-shown) + .search-clear {
    opacity: 1;
}

.search-clear:hover {
    background: var(--color-accent-red);
    color: white;
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 10px;
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 200;
    box-shadow: var(--shadow-lg);
}

.search-results.show {
    display: block;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: var(--transition-fast);
    border-bottom: 1px solid var(--color-border-light);
}

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

.search-result-item:hover {
    background: rgba(59, 130, 246, 0.1);
}

.search-result-item img {
    width: 40px;
    height: 28px;
    border-radius: 4px;
    object-fit: cover;
}

.search-result-item .result-icon {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.search-result-item .result-info h4 {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.search-result-item .result-info span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

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

.header-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 18px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.header-btn.earth-btn:hover {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--color-accent-purple);
}

.header-btn.atlas-btn:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--color-accent-cyan);
}

.header-btn .btn-icon {
    font-size: 1.1rem;
}

.theme-btn {
    padding: 10px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.main-nav {
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    scrollbar-width: none;
}

.main-nav::-webkit-scrollbar {
    display: none;
}

.nav-tabs {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 12px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-normal);
}

.nav-tab:hover {
    border-color: var(--color-accent-blue);
    color: var(--color-text-primary);
}

.nav-tab.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow-blue);
}

.tab-icon {
    font-size: 1.1rem;
}

.tab-badge {
    padding: 2px 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    flex: 1;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

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

/* ============================================
   HERO BANNER
   ============================================ */
.hero-banner {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.hero-bg {
    position: relative;
    height: 400px;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(10, 15, 26, 0.9) 0%,
        rgba(10, 15, 26, 0.7) 50%,
        rgba(10, 15, 26, 0.8) 100%
    );
}

.hero-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-2xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #fff, var(--color-accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

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

.hero-stat .stat-value {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent-cyan);
}

.hero-stat .stat-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-normal);
}

.hero-btn.primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
    box-shadow: var(--shadow-glow-blue);
}

.hero-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
}

.hero-btn.secondary {
    background: transparent;
    border: 2px solid var(--color-border);
    color: var(--color-text-primary);
}

.hero-btn.secondary:hover {
    border-color: var(--color-accent-cyan);
    background: rgba(6, 182, 212, 0.1);
}

/* ============================================
   SECTION BLOCKS
   ============================================ */
.section-block {
    margin-bottom: var(--spacing-2xl);
}

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

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
}

.title-icon {
    font-size: 1.3rem;
}

.see-all-btn {
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-normal);
}

.see-all-btn:hover {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
}

/* ============================================
   QUICK ACCESS GRID
   ============================================ */
.quick-access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.quick-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.quick-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.5s;
}

.quick-card:hover::before {
    left: 100%;
}

.quick-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-md);
}

.quick-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

.quick-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.quick-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ============================================
   FEATURED COUNTRIES
   ============================================ */
.featured-countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.country-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-normal);
}

.country-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-md);
}

.country-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-bottom: 1px solid var(--color-border-light);
}

.country-flag {
    width: 60px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.country-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.country-info span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.country-card-body {
    padding: var(--spacing-lg);
}

.country-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.country-stat {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
}

.country-stat label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 2px;
}

.country-stat span {
    font-size: 0.9rem;
    font-weight: 600;
}

.country-card-footer {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.country-action-btn {
    flex: 1;
    padding: 10px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.country-action-btn:hover {
    background: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
    color: white;
}

/* ============================================
   WORLD FACTS GRID
   ============================================ */
.world-facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.fact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.fact-card:hover {
    border-color: var(--color-accent-cyan);
}

.fact-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fact-content h4 {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.fact-value {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.fact-detail {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ============================================
   WORLD MAP CARD
   ============================================ */
.world-map-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.map-preview {
    position: relative;
    height: 350px;
}

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

.map-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 15, 26, 0.8), rgba(10, 15, 26, 0.6));
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-overlay-content {
    text-align: center;
}

.map-overlay-content h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.map-overlay-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.map-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 14px 28px;
    background: var(--gradient-secondary);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
}

.map-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-cyan);
}

/* ============================================
   EARTH SYSTEMS GRID
   ============================================ */
.earth-systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.system-card {
    display: block;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.1));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
    position: relative;
}

.system-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-purple);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.2);
}

.system-visual {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.system-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.system-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.system-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-accent-green);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

/* ============================================
   SECTION TOOLBAR
   ============================================ */
.section-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

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

.toolbar-title {
    font-size: 1.3rem;
    font-weight: 600;
}

.toolbar-count {
    padding: 4px 12px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

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

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.filter-select {
    padding: 8px 16px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

.view-toggle {
    display: flex;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.view-btn {
    padding: 8px 14px;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.view-btn.active {
    background: var(--color-accent-blue);
    color: white;
}

/* ============================================
   COUNTRIES GRID
   ============================================ */
.countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.countries-grid.list-view {
    grid-template-columns: 1fr;
}

.countries-grid.list-view .country-card {
    display: flex;
    flex-direction: row;
}

.countries-grid.list-view .country-card-header {
    flex-shrink: 0;
    width: 250px;
}

.countries-grid.list-view .country-card-body {
    flex: 1;
}

.countries-grid.list-view .country-stats {
    grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   LOAD MORE
   ============================================ */
.load-more-container {
    text-align: center;
    padding: var(--spacing-2xl);
}

.load-more-btn {
    padding: 14px 40px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.load-more-btn:hover {
    border-color: var(--color-accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

/* ============================================
   CONTINENTS GRID
   ============================================ */
.continents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.continent-card {
    position: relative;
    height: 280px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-normal);
}

.continent-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.continent-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-xl);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
}

.continent-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.continent-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ============================================
   PHYSICAL FEATURES
   ============================================ */
.physical-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: var(--spacing-sm);
}

.physical-tabs::-webkit-scrollbar {
    display: none;
}

.physical-tab {
    padding: 10px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-normal);
}

.physical-tab:hover {
    border-color: var(--color-accent-blue);
}

.physical-tab.active {
    background: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
    color: white;
}

.physical-content {
    min-height: 400px;
}

/* ============================================
   DISPUTES GRID
   ============================================ */
.disputes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--spacing-lg);
}

.dispute-card {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(249, 115, 22, 0.1));
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition-normal);
}

.dispute-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-accent-red);
}

.dispute-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.dispute-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
}

.dispute-type {
    padding: 4px 12px;
    background: rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--color-accent-red);
    font-weight: 500;
}

.dispute-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.dispute-countries {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.dispute-country {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.dispute-country img {
    width: 20px;
    height: 14px;
    border-radius: 2px;
}

/* ============================================
   COMING SOON MODAL
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 90%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border: none;
    border-radius: 50%;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-accent-red);
    color: white;
}

.coming-soon-content {
    padding: var(--spacing-2xl);
    text-align: center;
}

.coming-soon-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
}

.coming-soon-content h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.coming-soon-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.coming-soon-features {
    font-weight: 600;
    color: var(--color-accent-yellow);
}

.coming-soon-content ul {
    text-align: left;
    padding-left: 40px;
    margin-bottom: var(--spacing-xl);
}

.coming-soon-content li {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.coming-soon-btn {
    padding: 14px 40px;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.coming-soon-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
}

/* ============================================
   FOOTER
   ============================================ */
.app-footer {
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-right {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-right a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.footer-right a:hover {
    color: var(--color-accent-blue);
}

/* ============================================
   COMING SOON CARD
   ============================================ */
.coming-soon-card {
    background: linear-gradient(135deg, rgba(107, 114, 128, 0.1), rgba(75, 85, 99, 0.1));
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.coming-soon-card .icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.coming-soon-card h3 {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.coming-soon-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.coming-soon-card .badge {
    margin-top: var(--spacing-md);
    padding: 8px 20px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--color-accent-yellow);
    font-weight: 600;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1200px) {
    .header-btn .btn-text {
        display: none;
    }
    
    .header-btn {
        padding: 10px;
    }
}

@media (max-width: 992px) {
    .app-header {
        flex-wrap: wrap;
    }
    
    .header-center {
        order: 3;
        flex: 100%;
        max-width: none;
        margin-top: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-bg {
        height: 500px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .toolbar-right {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .countries-grid {
        grid-template-columns: 1fr;
    }
    
    .disputes-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: 1.2rem;
    }
    
    .nav-tab .tab-text {
        display: none;
    }
    
    .nav-tab {
        padding: 10px 14px;
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .hero-stat .stat-value {
        font-size: 1.8rem;
    }
}
/* ============================================
   BTS PURPLE HEART BUTTON
   ============================================ */

.bts-heart-btn {
    position: relative;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.3s ease;
    margin-right: 10px;
}

.bts-heart-btn:hover {
    transform: scale(1.3);
}

.bts-heart-btn .heart-icon {
    font-size: 1.8rem;
    z-index: 2;
    filter: drop-shadow(0 0 10px rgba(138, 43, 226, 0.8));
    animation: bts-heartbeat 1.5s ease-in-out infinite;
}

.bts-heart-btn .heart-pulse {
    position: absolute;
    width: 40px;
    height: 40px;
    background: rgba(138, 43, 226, 0.4);
    border-radius: 50%;
    animation: bts-pulse-ring 2s ease-out infinite;
}

.bts-heart-btn .heart-pulse.delay {
    animation-delay: 0.5s;
}

@keyframes bts-heartbeat {
    0%, 100% { 
        transform: scale(1); 
    }
    50% { 
        transform: scale(1.2); 
    }
}

@keyframes bts-pulse-ring {
    0% {
        transform: scale(0.5);
        opacity: 1;
    }
    100% {
        transform: scale(2.5);
        opacity: 0;
    }
}

/* Hover glow effect */
.bts-heart-btn:hover .heart-icon {
    filter: drop-shadow(0 0 20px rgba(138, 43, 226, 1)) 
            drop-shadow(0 0 40px rgba(138, 43, 226, 0.8));
}

/* Tooltip on hover */
.bts-heart-btn::after {
    content: 'BTS World 💜';
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, bottom 0.3s ease;
}

.bts-heart-btn:hover::after {
    opacity: 1;
    bottom: -40px;
}
/* ========================================
   KNOWLEDGE CATEGORIES GRID - NEW STYLES
   ======================================== */

.knowledge-categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 24px;
}

.knowledge-card {
    position: relative;
    height: 320px;
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.knowledge-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.knowledge-card-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.knowledge-card-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.knowledge-card:hover .knowledge-card-bg img {
    transform: scale(1.1);
}

.knowledge-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.2) 0%,
        rgba(0, 0, 0, 0.5) 50%,
        rgba(0, 0, 0, 0.85) 100%
    );
    z-index: 2;
    transition: background 0.3s ease;
}

.knowledge-card:hover .knowledge-card-overlay {
    background: linear-gradient(
        180deg,
        rgba(59, 130, 246, 0.2) 0%,
        rgba(59, 130, 246, 0.3) 50%,
        rgba(0, 0, 0, 0.9) 100%
    );
}

.knowledge-card-content {
    position: absolute;
    inset: 0;
    z-index: 3;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    color: white;
}

.knowledge-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    backdrop-filter: blur(10px);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.knowledge-card:hover .knowledge-icon {
    transform: scale(1.1);
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
}

.knowledge-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    font-family: 'Space Grotesk', sans-serif;
}

.knowledge-card p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.5;
    margin-bottom: 16px;
}

.knowledge-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.knowledge-tags .tag {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(5px);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.knowledge-card:hover .knowledge-tags .tag {
    background: rgba(59, 130, 246, 0.3);
    border-color: rgba(59, 130, 246, 0.5);
}

.knowledge-arrow {
    position: absolute;
    right: 24px;
    bottom: 24px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.knowledge-card:hover .knowledge-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Dictionary Card Special Style */
.dictionary-card .knowledge-icon {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.dictionary-card:hover .knowledge-card-overlay {
    background: linear-gradient(
        180deg,
        rgba(245, 158, 11, 0.2) 0%,
        rgba(239, 68, 68, 0.3) 50%,
        rgba(0, 0, 0, 0.9) 100%
    );
}

.dictionary-card:hover .knowledge-tags .tag {
    background: rgba(245, 158, 11, 0.3);
    border-color: rgba(245, 158, 11, 0.5);
}

.dictionary-card .knowledge-arrow {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

/* ========================================
   QUICK NAVIGATION GRID
   ======================================== */

.quick-nav-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 20px;
}

.quick-nav-card {
    background: var(--card-bg, rgba(255, 255, 255, 0.05));
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: 16px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quick-nav-card:hover {
    background: var(--card-hover-bg, rgba(59, 130, 246, 0.1));
    border-color: var(--primary-color, #3b82f6);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.quick-nav-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color, #3b82f6), var(--secondary-color, #8b5cf6));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.quick-nav-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary, #fff);
    margin-bottom: 4px;
}

.quick-nav-info span {
    font-size: 0.85rem;
    color: var(--text-secondary, rgba(255, 255, 255, 0.6));
}

/* ========================================
   SECTION SUBTITLE
   ======================================== */

.section-subtitle {
    color: var(--text-secondary, rgba(255, 255, 255, 0.6));
    font-size: 1rem;
    margin-top: 8px;
}

/* ========================================
   RESPONSIVE STYLES
   ======================================== */

@media (max-width: 1200px) {
    .knowledge-categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .quick-nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .knowledge-categories-grid {
        grid-template-columns: 1fr;
    }
    
    .knowledge-card {
        height: 280px;
    }
    
    .quick-nav-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .knowledge-card {
        height: 250px;
    }
    
    .knowledge-card h3 {
        font-size: 1.25rem;
    }
    
    .knowledge-card p {
        font-size: 0.85rem;
    }
    
    .knowledge-icon {
        width: 50px;
        height: 50px;
        font-size: 24px;
    }
}