/**
 * ═══════════════════════════════════════════════════════════════════════════
 * Kenneth's AMAZING Biotech Adventure - Styles
 * 10X More Visual, Fun, and Engaging!
 * ═══════════════════════════════════════════════════════════════════════════
 * 
 * Design Philosophy for Kenneth (and all kids!):
 * - HIGH contrast colors for visibility
 * - SATISFYING animations for every action
 * - CLEAR visual feedback
 * - PREDICTABLE patterns
 * - CELEBRATORY moments
 * - CALMING color palette with exciting accents
 * ═══════════════════════════════════════════════════════════════════════════
 */

/* ═══════════════════════════════════════════════════════════════════════════
   CSS VARIABLES - Kenneth's Color Palette
   ═══════════════════════════════════════════════════════════════════════════ */
:root {
    /* Primary Colors - Bright and Fun! */
    --color-cyan: #00f5ff;
    --color-cyan-light: #7dfeff;
    --color-cyan-dark: #00b8c4;
    
    --color-magenta: #ff00ff;
    --color-magenta-light: #ff77ff;
    --color-magenta-dark: #cc00cc;
    
    --color-green: #00ff88;
    --color-green-light: #66ffb3;
    --color-green-dark: #00cc6a;
    
    --color-gold: #ffd700;
    --color-gold-light: #ffe44d;
    --color-gold-dark: #ccac00;
    
    --color-purple: #a855f7;
    --color-purple-light: #c084fc;
    --color-purple-dark: #7c3aed;
    
    --color-orange: #ff8c00;
    --color-orange-light: #ffb347;
    --color-orange-dark: #cc7000;
    
    --color-red: #ff4466;
    --color-red-light: #ff7788;
    --color-red-dark: #cc3355;
    
    --color-blue: #4488ff;
    --color-blue-light: #77aaff;
    --color-blue-dark: #3366cc;
    
    /* Background Colors */
    --bg-dark: #0a0a1a;
    --bg-darker: #050510;
    --bg-card: #12122a;
    --bg-card-hover: #1a1a3a;
    --bg-highlight: #1e1e4a;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8b8d0;
    --text-muted: #6868a0;
    
    /* Connection Port Colors */
    --port-neural: #ff00ff;
    --port-vascular: #ff4466;
    --port-data: #00f5ff;
    --port-energy: #ffd700;
    --port-fluid: #00ff88;
    --port-universal: #ffffff;
    
    /* Module Tier Colors */
    --tier-basic: #4488ff;
    --tier-organoid: #00ff88;
    --tier-mps: #a855f7;
    --tier-advanced: #ffd700;
    
    /* UI */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 30px;
    
    /* Shadows */
    --shadow-glow-cyan: 0 0 20px rgba(0, 245, 255, 0.5);
    --shadow-glow-magenta: 0 0 20px rgba(255, 0, 255, 0.5);
    --shadow-glow-green: 0 0 20px rgba(0, 255, 136, 0.5);
    --shadow-glow-gold: 0 0 20px rgba(255, 215, 0, 0.5);
    
    /* Animation Durations */
    --anim-fast: 0.15s;
    --anim-medium: 0.3s;
    --anim-slow: 0.5s;
    --anim-very-slow: 1s;
    
    /* Grid */
    --cell-size: 70px;
    --cell-gap: 6px;
    
    /* Z-Index Layers */
    --z-background: 0;
    --z-grid: 10;
    --z-modules: 20;
    --z-connections: 15;
    --z-effects: 30;
    --z-ui: 40;
    --z-modal: 100;
    --z-toast: 150;
    --z-particles: 5;
}

/* High Contrast Mode */
[data-high-contrast="true"] {
    --bg-dark: #000000;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --color-cyan: #00ffff;
    --color-magenta: #ff00ff;
    --color-green: #00ff00;
}

/* Reduced Motion Mode - System preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Reduced Motion Mode - Manual setting */
[data-reduced-motion="true"] *,
[data-reduced-motion="true"] *::before,
[data-reduced-motion="true"] *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════════════════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-darker);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════════════════════════════════════════
   PARTICLE CANVAS - Background Magic!
   ═══════════════════════════════════════════════════════════════════════════ */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-particles);
    pointer-events: none;
    opacity: 0.6;
}

/* ═══════════════════════════════════════════════════════════════════════════
   SCREENS - Base Structure
   ═══════════════════════════════════════════════════════════════════════════ */
.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    opacity: 0;
    transition: opacity var(--anim-medium) ease;
    z-index: var(--z-ui);
}

.screen.active {
    display: flex;
    opacity: 1;
}

.screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: linear-gradient(180deg, var(--bg-dark) 0%, transparent 100%);
    pointer-events: auto;
    position: relative;
    z-index: 60;
}

.screen-title {
    font-family: 'Fredoka One', cursive;
    font-size: 2rem;
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ═══════════════════════════════════════════════════════════════════════════
   LOADING SCREEN - Kenneth's Lab is Powering Up!
   ═══════════════════════════════════════════════════════════════════════════ */
#loading-screen {
    background: radial-gradient(ellipse at center, var(--bg-dark) 0%, var(--bg-darker) 100%);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

/* DNA Helix Animation */
.loading-logo {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    position: relative;
}

.dna-helix {
    width: 100%;
    height: 100%;
    position: relative;
    animation: dnaRotate 4s linear infinite;
}

@keyframes dnaRotate {
    from { transform: rotateY(0deg); }
    to { transform: rotateY(360deg); }
}

.dna-strand {
    position: absolute;
    width: 4px;
    height: 100%;
    border-radius: 2px;
}

.strand-1 {
    left: 30%;
    background: linear-gradient(180deg, var(--color-cyan), var(--color-magenta), var(--color-cyan));
    animation: strandWave1 2s ease-in-out infinite;
}

.strand-2 {
    right: 30%;
    background: linear-gradient(180deg, var(--color-magenta), var(--color-cyan), var(--color-magenta));
    animation: strandWave2 2s ease-in-out infinite;
}

@keyframes strandWave1 {
    0%, 100% { transform: translateX(-10px); }
    50% { transform: translateX(10px); }
}

@keyframes strandWave2 {
    0%, 100% { transform: translateX(10px); }
    50% { transform: translateX(-10px); }
}

.dna-base {
    position: absolute;
    width: 40px;
    height: 6px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 3px;
}

.base-1 { top: 15%; background: var(--color-green); animation: basePulse 1s ease-in-out infinite 0s; }
.base-2 { top: 35%; background: var(--color-gold); animation: basePulse 1s ease-in-out infinite 0.2s; }
.base-3 { top: 55%; background: var(--color-purple); animation: basePulse 1s ease-in-out infinite 0.4s; }
.base-4 { top: 75%; background: var(--color-orange); animation: basePulse 1s ease-in-out infinite 0.6s; }

@keyframes basePulse {
    0%, 100% { opacity: 0.5; transform: translateX(-50%) scaleX(0.8); }
    50% { opacity: 1; transform: translateX(-50%) scaleX(1.2); }
}

/* Loading Title */
.loading-title {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: 2rem;
}

.title-kenneth {
    font-family: 'Fredoka One', cursive;
    font-size: 1.5rem;
    color: var(--color-gold);
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.title-biotech {
    font-family: 'Fredoka One', cursive;
    font-size: 3rem;
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleShimmer 3s linear infinite;
    background-size: 200% 200%;
}

@keyframes titleShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.title-adventure {
    font-family: 'Fredoka One', cursive;
    font-size: 1.8rem;
    color: var(--color-green);
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
}

/* Loading Bar */
.loading-bar-container {
    position: relative;
    margin-bottom: 1.5rem;
}

.loading-bar {
    width: 100%;
    height: 20px;
    background: var(--bg-card);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    border: 2px solid var(--color-cyan);
    box-shadow: var(--shadow-glow-cyan);
}

.loading-progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-cyan), var(--color-magenta), var(--color-green));
    background-size: 200% 100%;
    animation: progressShimmer 2s linear infinite;
    border-radius: 8px;
    transition: width var(--anim-medium) ease-out;
}

@keyframes progressShimmer {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.loading-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 30%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: loadingGlowMove 1.5s ease-in-out infinite;
}

@keyframes loadingGlowMove {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

/* Floating Bubbles */
.loading-bubbles {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.bubble {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-cyan);
    animation: bubbleFloat 1.5s ease-in-out infinite;
}

.bubble:nth-child(1) { animation-delay: 0s; background: var(--color-cyan); }
.bubble:nth-child(2) { animation-delay: 0.2s; background: var(--color-magenta); }
.bubble:nth-child(3) { animation-delay: 0.4s; background: var(--color-green); }
.bubble:nth-child(4) { animation-delay: 0.6s; background: var(--color-gold); }
.bubble:nth-child(5) { animation-delay: 0.8s; background: var(--color-purple); }

@keyframes bubbleFloat {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-15px) scale(1.2); opacity: 1; }
}

.loading-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.loading-tips {
    padding: 1rem;
    background: var(--bg-card);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(0, 245, 255, 0.2);
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   MAIN MENU - Kenneth's Command Center!
   ═══════════════════════════════════════════════════════════════════════════ */
#menu-screen {
    background: radial-gradient(ellipse at top, #1a1a4a 0%, var(--bg-darker) 100%);
}

.menu-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

/* Floating Cell Animations */
.floating-cells {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.cell {
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(2px);
    pointer-events: none;
}

.cell-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 10%;
    background: radial-gradient(circle, var(--color-cyan), transparent);
    animation: cellFloat 15s ease-in-out infinite;
}

.cell-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    background: radial-gradient(circle, var(--color-magenta), transparent);
    animation: cellFloat 12s ease-in-out infinite reverse;
}

.cell-3 {
    width: 180px;
    height: 180px;
    bottom: 20%;
    left: 20%;
    background: radial-gradient(circle, var(--color-green), transparent);
    animation: cellFloat 18s ease-in-out infinite 2s;
}

.cell-4 {
    width: 120px;
    height: 120px;
    top: 30%;
    right: 30%;
    background: radial-gradient(circle, var(--color-gold), transparent);
    animation: cellFloat 10s ease-in-out infinite 1s;
}

.cell-5 {
    width: 160px;
    height: 160px;
    top: 70%;
    left: 60%;
    background: radial-gradient(circle, var(--color-purple), transparent);
    animation: cellFloat 14s ease-in-out infinite 3s;
}

@keyframes cellFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.9); }
    75% { transform: translate(20px, 10px) scale(1.05); }
}

.menu-content {
    position: relative;
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    gap: 2rem;
    pointer-events: auto;
}

/* Logo Container */
.logo-container {
    text-align: center;
    margin-bottom: 1rem;
}

.logo-icon {
    font-size: 4rem;
    animation: logoFloat 3s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(0, 245, 255, 0.5));
}

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

.game-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.kenneth-name {
    font-family: 'Fredoka One', cursive;
    font-size: 1.8rem;
    color: var(--color-gold);
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    animation: nameGlow 2s ease-in-out infinite;
}

@keyframes nameGlow {
    0%, 100% { text-shadow: 0 0 30px rgba(255, 215, 0, 0.6); }
    50% { text-shadow: 0 0 50px rgba(255, 215, 0, 0.9), 0 0 80px rgba(255, 215, 0, 0.4); }
}

.biotech-text {
    font-family: 'Fredoka One', cursive;
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta), var(--color-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: titleShimmer 4s linear infinite;
    letter-spacing: 2px;
}

.adventure-text {
    font-family: 'Fredoka One', cursive;
    font-size: 2rem;
    color: var(--color-green);
    text-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
}

/* Player Card */
.player-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-highlight));
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-glow-cyan), inset 0 0 30px rgba(0, 245, 255, 0.1);
    animation: cardPulse 4s ease-in-out infinite;
}

@keyframes cardPulse {
    0%, 100% { box-shadow: var(--shadow-glow-cyan), inset 0 0 30px rgba(0, 245, 255, 0.1); }
    50% { box-shadow: 0 0 40px rgba(0, 245, 255, 0.7), inset 0 0 50px rgba(0, 245, 255, 0.2); }
}

.player-avatar {
    position: relative;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid var(--color-gold);
    border-radius: 50%;
    animation: ringRotate 8s linear infinite;
}

.avatar-ring::before {
    content: '';
    position: absolute;
    top: -3px;
    left: 50%;
    width: 10px;
    height: 10px;
    background: var(--color-gold);
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--color-gold);
}

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

.avatar-emoji {
    font-size: 2.5rem;
}

.level-badge {
    position: absolute;
    bottom: -5px;
    right: -5px;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--color-gold), var(--color-orange));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fredoka One', cursive;
    font-size: 0.9rem;
    color: var(--bg-dark);
    border: 2px solid var(--bg-dark);
    box-shadow: 0 0 10px var(--color-gold);
}

.player-info {
    text-align: left;
}

.player-name {
    font-family: 'Fredoka One', cursive;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.player-title {
    font-size: 0.9rem;
    color: var(--color-cyan);
    margin-bottom: 0.5rem;
}

.xp-bar-mini {
    width: 120px;
    height: 8px;
    background: var(--bg-dark);
    border-radius: 4px;
    overflow: hidden;
}

.xp-fill-mini {
    height: 100%;
    width: 30%;
    background: linear-gradient(90deg, var(--color-cyan), var(--color-magenta));
    border-radius: 4px;
    transition: width var(--anim-slow) ease-out;
}

.player-stats-mini {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.stat-icon {
    font-size: 1rem;
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--color-gold);
}

/* Menu Buttons */
.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 400px;
    pointer-events: auto;
    position: relative;
    z-index: 60;
}

.menu-btn {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-md);
    font-family: 'Nunito', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    overflow: hidden;
    text-align: left;
    pointer-events: auto !important;
    z-index: 100;
}

.menu-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--anim-slow) ease;
}

.menu-btn:hover::before {
    left: 100%;
}

.primary-btn {
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta));
    color: var(--text-primary);
    box-shadow: 0 4px 20px rgba(0, 245, 255, 0.4);
    transform: scale(1);
    animation: primaryPulse 2s ease-in-out infinite;
}

@keyframes primaryPulse {
    0%, 100% { box-shadow: 0 4px 20px rgba(0, 245, 255, 0.4); }
    50% { box-shadow: 0 4px 40px rgba(0, 245, 255, 0.7), 0 0 60px rgba(255, 0, 255, 0.3); }
}

.primary-btn:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 8px 40px rgba(0, 245, 255, 0.6);
}

.primary-btn:active {
    transform: scale(0.98);
}

.secondary-btn {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--color-cyan);
}

.secondary-btn:hover {
    background: var(--bg-highlight);
    border-color: var(--color-magenta);
    transform: translateX(5px);
    box-shadow: var(--shadow-glow-cyan);
}

.btn-icon {
    font-size: 1.8rem;
}

.btn-text {
    flex: 1;
}

.btn-subtitle {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
    display: block;
}

.icon-btn {
    width: 50px;
    height: 50px;
    padding: 0;
    justify-content: center;
    background: var(--bg-card);
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    align-self: center;
}

.icon-btn:hover {
    border-color: var(--color-cyan);
    background: var(--bg-highlight);
}

.menu-footer {
    margin-top: auto;
    text-align: center;
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   BUTTONS - Consistent Styling
   ═══════════════════════════════════════════════════════════════════════════ */
.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: 'Nunito', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    pointer-events: auto !important;
}

.back-btn:hover {
    background: var(--bg-highlight);
    transform: translateX(-5px);
    box-shadow: var(--shadow-glow-cyan);
}

.game-btn {
    padding: 0.5rem;
    background: var(--bg-card);
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.game-btn:hover {
    background: var(--bg-highlight);
    box-shadow: var(--shadow-glow-cyan);
}

/* ═══════════════════════════════════════════════════════════════════════════
   LEVEL SELECT SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#levels-screen {
    background: var(--bg-dark);
}

.levels-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem 2rem;
    overflow: hidden;
    pointer-events: auto;
    position: relative;
    z-index: 50;
}

.era-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.era-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    white-space: nowrap;
    pointer-events: auto !important;
}

.era-tab.active {
    background: linear-gradient(135deg, var(--bg-highlight), var(--bg-card));
    border-color: var(--color-cyan);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow-cyan);
}

.era-tab:hover:not(.active) {
    background: var(--bg-highlight);
    border-color: var(--text-muted);
}

.era-tab.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.era-icon {
    font-size: 1.5rem;
}

.lock-icon {
    font-size: 0.9rem;
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    overflow-y: auto;
    padding: 0.5rem;
}

.level-card {
    position: relative;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    text-align: center;
    pointer-events: auto !important;
}

.level-card:hover:not(.locked) {
    background: var(--bg-highlight);
    border-color: var(--color-cyan);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow-cyan);
}

.level-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
}

.level-card.completed {
    border-color: var(--color-green);
}

.level-number {
    font-family: 'Fredoka One', cursive;
    font-size: 2rem;
    color: var(--color-cyan);
    margin-bottom: 0.5rem;
}

.level-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.level-stars {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    font-size: 1.2rem;
}

.level-stars .star {
    color: var(--text-muted);
    transition: all var(--anim-fast) ease;
}

.level-stars .star.earned {
    color: var(--color-gold);
    text-shadow: 0 0 10px var(--color-gold);
    animation: starShine 2s ease-in-out infinite;
}

@keyframes starShine {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.level-lock {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    opacity: 0.8;
}

/* ═══════════════════════════════════════════════════════════════════════════
   GAME SCREEN - Kenneth's Laboratory!
   ═══════════════════════════════════════════════════════════════════════════ */
#game-screen {
    background: radial-gradient(ellipse at center, #0f0f2a 0%, var(--bg-darker) 100%);
    display: flex;
    flex-direction: column;
}

/* Game Header */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(180deg, rgba(10, 10, 30, 0.95) 0%, rgba(10, 10, 30, 0.8) 100%);
    border-bottom: 2px solid var(--color-cyan);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    z-index: 50;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.level-info {
    display: flex;
    flex-direction: column;
}

.level-info .level-name {
    font-family: 'Fredoka One', cursive;
    font-size: 1.1rem;
    color: var(--color-cyan);
}

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

/* Timer */
.timer-display {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 2px solid var(--color-gold);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-glow-gold);
}

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

.timer-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gold);
    min-width: 60px;
}

.timer-bar {
    width: 100px;
    height: 8px;
    background: var(--bg-dark);
    border-radius: 4px;
    overflow: hidden;
}

.timer-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, var(--color-green), var(--color-gold), var(--color-red));
    border-radius: 4px;
    transition: width 1s linear;
}

.timer-display.warning {
    border-color: var(--color-orange);
    animation: timerWarning 0.5s ease-in-out infinite;
}

.timer-display.critical {
    border-color: var(--color-red);
    animation: timerCritical 0.3s ease-in-out infinite;
}

@keyframes timerWarning {
    0%, 100% { box-shadow: 0 0 10px var(--color-orange); }
    50% { box-shadow: 0 0 25px var(--color-orange); }
}

@keyframes timerCritical {
    0%, 100% { box-shadow: 0 0 10px var(--color-red); transform: scale(1); }
    50% { box-shadow: 0 0 30px var(--color-red); transform: scale(1.02); }
}

/* Score Display */
.score-display, .target-display {
    text-align: center;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border-radius: var(--border-radius-md);
    border: 2px solid var(--color-cyan);
}

.score-label, .target-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-cyan);
}

.target-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-green);
}

.combo-indicator {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.25rem;
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--anim-fast) ease;
}

.combo-indicator.active {
    opacity: 1;
    transform: scale(1);
}

.combo-text {
    font-size: 0.6rem;
    color: var(--color-magenta);
}

.combo-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-magenta);
}

/* Main Game Area */
.game-main {
    flex: 1;
    display: flex;
    gap: 1rem;
    padding: 1rem;
    overflow: hidden;
}

/* Sidebars */
.game-sidebar {
    width: 180px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    overflow-y: auto;
    font-size: 0.85em;
}

.panel-title {
    font-family: 'Fredoka One', cursive;
    font-size: 0.9rem;
    color: var(--color-cyan);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(0, 245, 255, 0.3);
}

.objectives-panel, .tips-panel, .power-ups-panel,
.selected-module-panel, .synergy-panel, .achievements-mini {
    background: var(--bg-card);
    border: 1px solid rgba(0, 245, 255, 0.2);
    border-radius: var(--border-radius-md);
    padding: 1rem;
}

.objectives-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.objective-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.5rem;
    background: var(--bg-dark);
    border-radius: var(--border-radius-sm);
    transition: all var(--anim-fast) ease;
}

.objective-item.completed {
    color: var(--color-green);
    background: rgba(0, 255, 136, 0.1);
}

.objective-item.completed::before {
    content: '✓';
    color: var(--color-green);
    font-weight: bold;
}

.objective-item:not(.completed)::before {
    content: '○';
    color: var(--text-muted);
}

.tip-content {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Power-ups */
.power-ups-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.power-up-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    background: var(--bg-dark);
    border: 2px solid var(--text-muted);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.power-up-btn:hover:not(:disabled) {
    border-color: var(--color-gold);
    background: rgba(255, 215, 0, 0.1);
    transform: translateY(-2px);
}

.power-up-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.power-icon {
    font-size: 1.5rem;
}

.power-count {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    background: var(--color-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--bg-dark);
}

.empty-state {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    font-style: italic;
}

/* Grid Container */
.grid-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    min-width: 0;
}

.grid-wrapper {
    position: relative;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.05) 0%, rgba(255, 0, 255, 0.05) 100%);
    border: 3px solid var(--color-cyan);
    border-radius: var(--border-radius-lg);
    box-shadow: 
        var(--shadow-glow-cyan),
        inset 0 0 50px rgba(0, 245, 255, 0.1);
}

.grid-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    border-radius: var(--border-radius-lg);
    pointer-events: none;
}

.grid {
    display: grid;
    gap: var(--cell-gap);
    position: relative;
    z-index: var(--z-grid);
}

/* Grid Cells */
.grid-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background: var(--bg-card);
    border: 2px solid rgba(0, 245, 255, 0.2);
    border-radius: var(--border-radius-sm);
    position: relative;
    transition: all var(--anim-fast) ease;
    cursor: pointer;
}

.grid-cell:hover:not(.occupied) {
    background: rgba(0, 245, 255, 0.1);
    border-color: var(--color-cyan);
    box-shadow: inset 0 0 20px rgba(0, 245, 255, 0.2);
}

.grid-cell.valid-drop {
    background: rgba(0, 255, 136, 0.2);
    border-color: var(--color-green);
    box-shadow: inset 0 0 20px rgba(0, 255, 136, 0.3);
    animation: validPulse 0.5s ease-in-out infinite;
}

@keyframes validPulse {
    0%, 100% { box-shadow: inset 0 0 20px rgba(0, 255, 136, 0.3); }
    50% { box-shadow: inset 0 0 30px rgba(0, 255, 136, 0.5), 0 0 15px rgba(0, 255, 136, 0.3); }
}

.grid-cell.invalid-drop {
    background: rgba(255, 68, 102, 0.2);
    border-color: var(--color-red);
}

.grid-cell.occupied {
    cursor: default;
}

/* Connections Layer */
.connections-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-connections);
}

.connection-line {
    stroke-width: 4;
    stroke-linecap: round;
    filter: drop-shadow(0 0 3px currentColor);
}

.connection-line.neural { stroke: var(--port-neural); }
.connection-line.vascular { stroke: var(--port-vascular); }
.connection-line.data { stroke: var(--port-data); }
.connection-line.energy { stroke: var(--port-energy); }
.connection-line.fluid { stroke: var(--port-fluid); }
.connection-line.universal { stroke: var(--port-universal); }

.connection-line.animated {
    stroke-dasharray: 10 5;
    animation: connectionFlow 1s linear infinite;
}

@keyframes connectionFlow {
    from { stroke-dashoffset: 15; }
    to { stroke-dashoffset: 0; }
}

/* Grid Effects Layer */
.grid-effects {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-effects);
    overflow: hidden;
}

/* Feedback Area */
.feedback-area {
    position: absolute;
    bottom: -60px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    min-height: 50px;
}

.feedback-message {
    font-family: 'Fredoka One', cursive;
    font-size: 1.2rem;
    color: var(--color-gold);
    text-shadow: 0 0 20px var(--color-gold);
    animation: feedbackPop 0.5s ease-out;
}

@keyframes feedbackPop {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

/* Module Tray */
.module-tray {
    background: linear-gradient(0deg, rgba(10, 10, 30, 0.98) 0%, rgba(10, 10, 30, 0.9) 100%);
    border-top: 2px solid var(--color-cyan);
    padding: 0.75rem 1rem;
    z-index: 50;
}

.tray-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.tray-title {
    font-family: 'Fredoka One', cursive;
    font-size: 1rem;
    color: var(--color-cyan);
}

.tray-filters {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.4rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--text-muted);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.filter-btn.active, .filter-btn:hover {
    background: var(--bg-highlight);
    border-color: var(--color-cyan);
    color: var(--text-primary);
}

.tray-scroll {
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 0.5rem;
}

.module-list {
    display: flex;
    gap: 0.75rem;
    min-height: 90px;
}

/* Module Cards (in tray) */
.module-card {
    flex-shrink: 0;
    width: 80px;
    height: 90px;
    background: var(--bg-card);
    border: 2px solid var(--text-muted);
    border-radius: var(--border-radius-md);
    padding: 0.5rem;
    cursor: grab;
    transition: all var(--anim-fast) ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.module-card:hover {
    border-color: var(--color-cyan);
    background: var(--bg-highlight);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow-cyan);
}

.module-card:active {
    cursor: grabbing;
}

.module-card.dragging {
    opacity: 0.5;
}

.module-card.tier-1 { border-color: var(--tier-basic); }
.module-card.tier-2 { border-color: var(--tier-organoid); }
.module-card.tier-3 { border-color: var(--tier-mps); }
.module-card.tier-4 { border-color: var(--tier-advanced); }

.module-icon {
    font-size: 2rem;
    margin-bottom: 0.25rem;
    filter: drop-shadow(0 0 5px currentColor);
}

.module-name {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.module-count {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 22px;
    height: 22px;
    background: var(--color-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--bg-dark);
    border: 2px solid var(--bg-dark);
}

/* Placed Module (on grid) */
.placed-module {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-highlight));
    border-radius: var(--border-radius-sm);
    position: relative;
    animation: modulePlaceIn 0.3s ease-out;
}

@keyframes modulePlaceIn {
    0% { transform: scale(0.5) rotate(-10deg); opacity: 0; }
    60% { transform: scale(1.1) rotate(3deg); }
    100% { transform: scale(1) rotate(0); opacity: 1; }
}

.placed-module .module-icon {
    font-size: 1.8rem;
}

/* Connection Ports */
.port {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--bg-dark);
    transition: all var(--anim-fast) ease;
}

.port.top { top: -6px; left: 50%; transform: translateX(-50%); }
.port.right { right: -6px; top: 50%; transform: translateY(-50%); }
.port.bottom { bottom: -6px; left: 50%; transform: translateX(-50%); }
.port.left { left: -6px; top: 50%; transform: translateY(-50%); }

.port.neural { background: var(--port-neural); box-shadow: 0 0 8px var(--port-neural); }
.port.vascular { background: var(--port-vascular); box-shadow: 0 0 8px var(--port-vascular); }
.port.data { background: var(--port-data); box-shadow: 0 0 8px var(--port-data); }
.port.energy { background: var(--port-energy); box-shadow: 0 0 8px var(--port-energy); }
.port.fluid { background: var(--port-fluid); box-shadow: 0 0 8px var(--port-fluid); }
.port.universal { background: var(--port-universal); box-shadow: 0 0 8px var(--port-universal); }

.port.connected {
    animation: portPulse 1s ease-in-out infinite;
}

@keyframes portPulse {
    0%, 100% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(1.3); }
}

.port.top.connected { animation-name: portPulseTop; }
.port.right.connected { animation-name: portPulseRight; }
.port.bottom.connected { animation-name: portPulseBottom; }
.port.left.connected { animation-name: portPulseLeft; }

@keyframes portPulseTop { 0%, 100% { transform: translateX(-50%) scale(1); } 50% { transform: translateX(-50%) scale(1.3); } }
@keyframes portPulseRight { 0%, 100% { transform: translateY(-50%) scale(1); } 50% { transform: translateY(-50%) scale(1.3); } }
@keyframes portPulseBottom { 0%, 100% { transform: translateX(-50%) scale(1); } 50% { transform: translateX(-50%) scale(1.3); } }
@keyframes portPulseLeft { 0%, 100% { transform: translateY(-50%) scale(1); } 50% { transform: translateY(-50%) scale(1.3); } }

/* ═══════════════════════════════════════════════════════════════════════════
   MODALS
   ═══════════════════════════════════════════════════════════════════════════ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-card);
    border: 3px solid var(--color-cyan);
    border-radius: var(--border-radius-xl);
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-glow-cyan), 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from { transform: translateY(-50px) scale(0.9); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-content h2 {
    font-family: 'Fredoka One', cursive;
    font-size: 2rem;
    color: var(--color-cyan);
    margin-bottom: 1rem;
}

.modal-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-dark);
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: 'Nunito', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    margin: 0.25rem;
}

.modal-btn:hover {
    background: var(--bg-highlight);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-cyan);
}

.modal-btn.primary {
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta));
    border: none;
    color: white;
}

.modal-btn.primary:hover {
    box-shadow: 0 4px 30px rgba(0, 245, 255, 0.5);
}

/* Pause Modal */
.pause-content {
    border-color: var(--color-gold);
}

.pause-message {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.pause-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

.pause-stat .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.pause-stat .stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gold);
}

.pause-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

/* Complete Modal - CELEBRATION! */
.complete-content {
    border-color: var(--color-gold);
    overflow: hidden;
    position: relative;
}

.celebration-effects {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    animation: confettiFall 3s linear forwards;
}

@keyframes confettiFall {
    0% { transform: translateY(-100%) rotate(0deg); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

.complete-title {
    font-family: 'Fredoka One', cursive;
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--color-gold), var(--color-orange), var(--color-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    animation: titleCelebrate 0.5s ease-out;
}

@keyframes titleCelebrate {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

.stars-display {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.stars-display .star {
    font-size: 3rem;
    color: var(--text-muted);
    transform: scale(0);
    transition: all 0.3s ease-out;
}

.stars-display .star.earned {
    color: var(--color-gold);
    transform: scale(1);
    text-shadow: 0 0 30px var(--color-gold);
    animation: starEarn 0.5s ease-out backwards;
}

.stars-display .star:nth-child(1).earned { animation-delay: 0.2s; }
.stars-display .star:nth-child(2).earned { animation-delay: 0.4s; }
.stars-display .star:nth-child(3).earned { animation-delay: 0.6s; }

@keyframes starEarn {
    0% { transform: scale(0) rotate(-180deg); }
    60% { transform: scale(1.3) rotate(20deg); }
    100% { transform: scale(1) rotate(0deg); }
}

.complete-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.complete-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.complete-stat {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-dark);
    border-radius: var(--border-radius-md);
}

.complete-stat .stat-icon {
    font-size: 1.5rem;
}

.complete-stat .stat-info {
    text-align: left;
}

.complete-stat .stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.complete-stat .stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-cyan);
}

.xp-reward {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 0, 255, 0.2));
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
}

.xp-icon {
    font-size: 1.5rem;
    animation: xpSpin 2s linear infinite;
}

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

.xp-text {
    font-family: 'Fredoka One', cursive;
    font-size: 1.5rem;
    color: var(--color-gold);
}

.xp-bar-reward {
    flex: 1;
    max-width: 150px;
    height: 10px;
    background: var(--bg-dark);
    border-radius: 5px;
    overflow: hidden;
}

.xp-fill-reward {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-gold), var(--color-magenta));
    border-radius: 5px;
    transition: width 1s ease-out;
}

.unlocks-section {
    margin-bottom: 1.5rem;
}

.unlocks-section h3 {
    font-family: 'Fredoka One', cursive;
    color: var(--color-green);
    margin-bottom: 0.75rem;
}

.unlocks-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.unlock-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--color-green);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    animation: unlockPop 0.3s ease-out backwards;
}

@keyframes unlockPop {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.complete-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

/* Game Over Modal */
.gameover-content {
    border-color: var(--color-red);
}

.gameover-content h2 {
    color: var(--color-orange);
}

.gameover-message {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.gameover-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

.gameover-stat .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.gameover-stat .stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
}

.gameover-tip {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-dark);
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
    text-align: left;
}

.gameover-tip .tip-icon {
    font-size: 1.5rem;
}

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

.gameover-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════════════════════════════════════════ */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: toastSlideIn 0.3s ease-out;
    pointer-events: auto;
    max-width: 350px;
}

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

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

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

.toast.info {
    border-left: 4px solid var(--color-cyan);
}

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

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

.toast.success .toast-icon { color: var(--color-green); }
.toast.error .toast-icon { color: var(--color-red); }
.toast.info .toast-icon { color: var(--color-cyan); }
.toast.warning .toast-icon { color: var(--color-orange); }

.toast-message {
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* ═══════════════════════════════════════════════════════════════════════════
   FLOATING MESSAGE
   ═══════════════════════════════════════════════════════════════════════════ */
.floating-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Fredoka One', cursive;
    font-size: 2.5rem;
    color: var(--color-gold);
    text-shadow: 
        0 0 20px var(--color-gold),
        0 0 40px var(--color-gold),
        0 0 60px var(--color-orange);
    pointer-events: none;
    z-index: 200;
    opacity: 0;
    white-space: nowrap;
}

.floating-message.active {
    animation: floatingPop 1s ease-out forwards;
}

@keyframes floatingPop {
    0% { transform: translate(-50%, -50%) scale(0.5); opacity: 0; }
    20% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
    80% { transform: translate(-50%, -60%) scale(1); opacity: 1; }
    100% { transform: translate(-50%, -70%) scale(0.8); opacity: 0; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   TUTORIAL SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#tutorial-screen {
    background: var(--bg-dark);
}

.tutorial-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.tutorial-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.tutorial-header h1 {
    font-family: 'Fredoka One', cursive;
    font-size: 2rem;
    color: var(--color-cyan);
}

.tutorial-progress {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
}

.tutorial-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.tutorial-step {
    max-width: 600px;
}

.tutorial-step h2 {
    font-family: 'Fredoka One', cursive;
    font-size: 1.8rem;
    color: var(--color-gold);
    margin-bottom: 1rem;
}

.tutorial-step p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.tutorial-image {
    width: 100%;
    max-width: 400px;
    height: 200px;
    background: var(--bg-card);
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 4rem;
}

.tutorial-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.tutorial-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border: 2px solid var(--color-cyan);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.tutorial-btn:hover {
    background: var(--bg-highlight);
}

.tutorial-btn.primary {
    background: linear-gradient(135deg, var(--color-cyan), var(--color-magenta));
    border: none;
}

.tutorial-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.tutorial-dots {
    display: flex;
    gap: 0.5rem;
}

.tutorial-dot {
    width: 10px;
    height: 10px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all var(--anim-fast) ease;
}

.tutorial-dot.active {
    background: var(--color-cyan);
    box-shadow: 0 0 10px var(--color-cyan);
}

/* ═══════════════════════════════════════════════════════════════════════════
   COLLECTION SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#collection-screen {
    background: var(--bg-dark);
}

.collection-stats {
    font-family: 'JetBrains Mono', monospace;
    color: var(--color-gold);
}

.collection-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem 2rem;
    overflow: hidden;
    pointer-events: auto;
    position: relative;
    z-index: 50;
}

.collection-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.category-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    pointer-events: auto !important;
}

.category-btn.active, .category-btn:hover {
    background: var(--bg-highlight);
    border-color: var(--color-cyan);
    color: var(--text-primary);
}

.collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
    overflow-y: auto;
    padding: 0.5rem;
}

.collection-card {
    background: var(--bg-card);
    border: 2px solid var(--text-muted);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
    pointer-events: auto !important;
}

.collection-card:hover {
    border-color: var(--color-cyan);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow-cyan);
}

.collection-card.locked {
    opacity: 0.4;
    filter: grayscale(100%);
}

.collection-card .module-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.collection-card .module-name {
    font-weight: 600;
    color: var(--text-primary);
}

.collection-card .module-category {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Module Detail Modal */
.module-detail-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.module-detail-modal.active {
    display: flex;
}

/* ═══════════════════════════════════════════════════════════════════════════
   SETTINGS SCREEN
   ═══════════════════════════════════════════════════════════════════════════ */
#settings-screen {
    background: var(--bg-dark);
}

.settings-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.settings-section {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
}

.settings-section h2 {
    font-family: 'Fredoka One', cursive;
    font-size: 1.2rem;
    color: var(--color-cyan);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(0, 245, 255, 0.2);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.setting-item label {
    font-weight: 600;
    color: var(--text-primary);
}

.setting-item input[type="range"] {
    width: 150px;
    accent-color: var(--color-cyan);
}

.volume-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: right;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark);
    border: 2px solid var(--text-muted);
    border-radius: 13px;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 2px;
    bottom: 2px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: all var(--anim-fast) ease;
}

.toggle-switch input:checked + .toggle-slider {
    background: rgba(0, 245, 255, 0.2);
    border-color: var(--color-cyan);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(24px);
    background: var(--color-cyan);
    box-shadow: 0 0 10px var(--color-cyan);
}

.danger-zone {
    border: 2px solid var(--color-red);
}

.danger-zone h2 {
    color: var(--color-red);
}

.danger-btn {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255, 68, 102, 0.1);
    border: 2px solid var(--color-red);
    border-radius: var(--border-radius-md);
    color: var(--color-red);
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--anim-fast) ease;
}

.danger-btn:hover {
    background: rgba(255, 68, 102, 0.2);
}

/* ═══════════════════════════════════════════════════════════════════════════
   PARTICLES & EFFECTS
   ═══════════════════════════════════════════════════════════════════════════ */
.particle {
    position: absolute;
    pointer-events: none;
    border-radius: 50%;
}

.spark {
    width: 6px;
    height: 6px;
    animation: sparkFly 0.6s ease-out forwards;
}

@keyframes sparkFly {
    0% { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--tx), var(--ty)) scale(0); opacity: 0; }
}

.glow-pulse {
    position: absolute;
    border-radius: 50%;
    animation: glowExpand 0.5s ease-out forwards;
}

@keyframes glowExpand {
    0% { transform: scale(0); opacity: 0.8; }
    100% { transform: scale(2); opacity: 0; }
}

.score-popup {
    position: absolute;
    font-family: 'Fredoka One', cursive;
    font-size: 1.2rem;
    color: var(--color-gold);
    text-shadow: 0 0 10px var(--color-gold);
    pointer-events: none;
    animation: scoreFloat 1s ease-out forwards;
}

@keyframes scoreFloat {
    0% { transform: translateY(0) scale(0.5); opacity: 0; }
    20% { transform: translateY(-10px) scale(1.2); opacity: 1; }
    100% { transform: translateY(-50px) scale(1); opacity: 0; }
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1200px) {
    .game-sidebar {
        width: 180px;
    }
    
    :root {
        --cell-size: 60px;
    }
}

@media (max-width: 992px) {
    .game-sidebar.left-sidebar {
        display: none;
    }
    
    .game-main {
        gap: 0.5rem;
    }
}

@media (max-width: 768px) {
    .game-sidebar {
        display: none;
    }
    
    .game-header {
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
    }
    
    .header-center {
        order: -1;
        width: 100%;
        justify-content: center;
    }
    
    .menu-buttons {
        max-width: 100%;
    }
    
    .player-card {
        flex-wrap: wrap;
        justify-content: center;
        text-align: center;
    }
    
    .player-info {
        text-align: center;
    }
    
    :root {
        --cell-size: 50px;
    }
}

@media (max-width: 480px) {
    :root {
        --cell-size: 45px;
    }
    
    .game-title .biotech-text {
        font-size: 2.5rem;
    }
    
    .module-tray {
        padding: 0.5rem;
    }
    
    .module-card {
        width: 65px;
        height: 75px;
    }
    
    .module-card .module-icon {
        font-size: 1.5rem;
    }
    
    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ACCESSIBILITY
   ═══════════════════════════════════════════════════════════════════════════ */
:focus-visible {
    outline: 3px solid var(--color-cyan);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Print styles - hide game elements */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .screen:not(#collection-screen),
    #particle-canvas,
    .toast-container {
        display: none !important;
    }
}