/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Courier New', monospace;
    background: #000;
    color: #fff;
    overflow: hidden;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Game container */
#gameContainer {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* Canvas */
#gameCanvas {
    display: block;
    background: linear-gradient(to bottom, #001122 0%, #000000 100%);
    touch-action: none;
    width: 100%;
    height: 100%;
}

/* HUD overlay */
.hud {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 100%);
    font-size: 16px;
    font-weight: bold;
    z-index: 10;
    pointer-events: none;
    flex-wrap: wrap;
    gap: 10px;
}

.hud > * {
    pointer-events: all;
}

.pause-btn {
    background: rgba(255,255,255,0.2);
    border: 2px solid #fff;
    color: #fff;
    font-size: 20px;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.pause-btn:hover,
.pause-btn:active {
    background: rgba(255,255,255,0.4);
    transform: scale(1.1);
}

/* Screen overlays */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.95);
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 20;
    padding: 20px;
    backdrop-filter: blur(5px);
}

.screen.active {
    display: flex;
}

/* Typography */
h1 {
    font-size: clamp(32px, 8vw, 64px);
    margin-bottom: 10px;
    text-shadow: 0 0 20px #00ff88;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.tagline {
    font-size: clamp(12px, 3vw, 16px);
    color: #00ff88;
    margin-bottom: 10px;
    opacity: 0.8;
}

.controls {
    font-size: clamp(14px, 3vw, 18px);
    margin-bottom: 30px;
    opacity: 0.7;
}

h2 {
    font-size: clamp(24px, 6vw, 48px);
    margin-bottom: 20px;
    text-shadow: 0 0 15px #ff6600;
    letter-spacing: 2px;
    text-transform: uppercase;
}

h3 {
    font-size: clamp(20px, 5vw, 32px);
    margin-bottom: 15px;
    color: #00ff88;
}

p {
    font-size: clamp(14px, 3vw, 20px);
    margin-bottom: 20px;
    opacity: 0.8;
    line-height: 1.4;
}

/* Buttons */
.game-btn {
    background: linear-gradient(45deg, #00ff88, #00cc66);
    border: none;
    color: #000;
    font-size: clamp(16px, 4vw, 24px);
    font-weight: bold;
    font-family: 'Courier New', monospace;
    padding: 15px 30px;
    margin: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    min-width: 200px;
    min-height: 44px;
    letter-spacing: 1px;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(0,255,136,0.3);
}

.game-btn:hover,
.game-btn:active {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,255,136,0.5);
}

.game-btn.secondary {
    background: linear-gradient(45deg, #666, #999);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255,255,255,0.2);
}

.game-btn.secondary:hover,
.game-btn.secondary:active {
    box-shadow: 0 6px 20px rgba(255,255,255,0.3);
}

/* Score displays */
.score-summary {
    margin: 20px 0;
}

.final-score,
.high-score,
.wave-reached {
    font-size: clamp(18px, 4vw, 28px);
    margin: 10px 0;
}

.high-score,
.high-score-display {
    color: #00ff88;
    text-shadow: 0 0 10px #00ff88;
}

.new-high-score {
    color: #ffff00;
    font-size: clamp(16px, 4vw, 24px);
    text-shadow: 0 0 15px #ffff00;
    animation: pulse 1s infinite;
    margin: 15px 0;
}

.high-score-display {
    margin-top: 30px;
    font-size: clamp(16px, 4vw, 22px);
}

/* Wave complete screen */
.wave-stats,
.pause-stats {
    margin: 20px 0;
    font-size: clamp(16px, 4vw, 24px);
}

.wave-stats > div,
.pause-stats > div {
    margin: 10px 0;
}

/* Instructions */
.instructions {
    max-width: 500px;
    margin: 20px 0;
}

.instruction-item {
    display: flex;
    align-items: flex-start;
    text-align: left;
    margin: 20px 0;
    padding: 15px;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
    border-left: 4px solid #00ff88;
}

.instruction-item .icon {
    font-size: 24px;
    margin-right: 15px;
    flex-shrink: 0;
}

.instruction-item strong {
    color: #00ff88;
}

.instruction-item small {
    opacity: 0.7;
    font-size: 0.9em;
}

/* Loading screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loader {
    text-align: center;
}

.loader-text {
    font-size: clamp(16px, 4vw, 24px);
    color: #00ff88;
    text-shadow: 0 0 10px #00ff88;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.loader-bar {
    width: 250px;
    height: 8px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto;
}

.loader-progress {
    height: 100%;
    background: linear-gradient(90deg, #00ff88, #00cc66);
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(0,255,136,0.5);
}

/* Install prompt */
.install-prompt {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background: rgba(0,0,0,0.9);
    border: 2px solid #00ff88;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,255,136,0.3);
}

.install-content h3 {
    margin-bottom: 10px;
}

.install-content p {
    margin-bottom: 15px;
    font-size: clamp(14px, 3vw, 16px);
}

.install-prompt .game-btn {
    min-width: 120px;
    padding: 10px 20px;
    font-size: clamp(14px, 3vw, 18px);
}

/* Animations */
@keyframes pulse {
    0%, 100% { 
        opacity: 1;
        transform: scale(1);
    }
    50% { 
        opacity: 0.7;
        transform: scale(1.05);
    }
}

@keyframes glow {
    0%, 100% { text-shadow: 0 0 10px #00ff88; }
    50% { text-shadow: 0 0 20px #00ff88, 0 0 30px #00ff88; }
}

/* Mobile landscape optimizations */
@media screen and (orientation: landscape) and (max-height: 500px) {
    .hud {
        padding: 5px 15px;
        font-size: 12px;
    }
    
    .pause-btn {
        width: 36px;
        height: 36px;
        font-size: 16px;
    }
    
    h1 {
        font-size: clamp(24px, 6vw, 40px);
        margin-bottom: 5px;
    }
    
    h2 {
        font-size: clamp(20px, 5vw, 32px);
        margin-bottom: 10px;
    }
    
    .game-btn {
        padding: 8px 16px;
        margin: 4px;
        min-width: 140px;
        font-size: clamp(14px, 3vw, 16px);
    }
    
    .instruction-item {
        margin: 10px 0;
        padding: 10px;
    }
    
    .instruction-item .icon {
        font-size: 20px;
        margin-right: 10px;
    }
    
    .screen {
        padding: 10px;
    }
}

/* Mobile portrait optimizations */
@media screen and (orientation: portrait) and (max-width: 480px) {
    .hud {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
        padding: 8px 15px;
    }
    
    .pause-btn {
        position: absolute;
        top: 10px;
        right: 15px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hud {
        font-size: 14px;
    }
    
    .game-btn {
        border: none;
        outline: none;
    }
}

/* Safe area support for iOS */
@supports (padding: max(0px)) {
    .hud {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
        padding-top: max(10px, env(safe-area-inset-top));
    }
    
    .screen {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
        padding-bottom: max(20px, env(safe-area-inset-bottom));
        padding-top: max(20px, env(safe-area-inset-top));
    }
    
    .install-prompt {
        left: max(20px, env(safe-area-inset-left));
        right: max(20px, env(safe-area-inset-right));
        bottom: max(20px, env(safe-area-inset-bottom));
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .new-high-score {
        animation: none;
    }
}

/* Focus styles for keyboard navigation */
.game-btn:focus,
.pause-btn:focus {
    outline: 3px solid #00ff88;
    outline-offset: 2px;
}

/* Dark mode support (default is dark) */
@media (prefers-color-scheme: light) {
    /* Game stays dark themed regardless of system preference */
}

/* Print styles (hide game when printing) */
@media print {
    body {
        display: none;
    }
}