:root {
    --bg-dark: #050510;
    --neon-blue: #00f3ff;
    --neon-purple: #bc13fe;
    --neon-green: #00ff66;
    --neon-red: #ff003c;
    --text-main: #e0e0e0;
    --panel-bg: rgba(5, 5, 16, 0.85);
    --panel-border: rgba(0, 243, 255, 0.4);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Share Tech Mono', monospace;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    touch-action: none; /* Prevent pinch zoom / scroll on mobile */
}

h1, h2, h3, .menu-header, .tower-name, .btn-text {
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 2px;
}

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #111122 0%, #000000 100%);
}

#gameCanvas {
    position: absolute;
    /* Canvas will be scaled via JS but we want it centered */
    transform-origin: center center;
    box-shadow: 0 0 50px rgba(0, 243, 255, 0.1);
    background-image: url('../assets/images/game_background_1776864147024.png');
    background-size: cover;
    background-position: center;
    image-rendering: optimizeSpeed;
}

/* UI Screens Base */
.ui-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 100;
    transition: opacity 0.5s ease;
}

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

/* Start Screen specific */
#start-screen {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.95) 0%, rgba(5, 5, 15, 0.85) 100%);
}

.game-logo {
    width: 150px;
    height: 150px;
    margin-bottom: 20px;
    filter: drop-shadow(0 0 20px var(--neon-blue));
    animation: float 3s ease-in-out infinite;
}

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

.hologram-effect {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        transparent,
        transparent 2px,
        rgba(0, 243, 255, 0.05) 3px,
        transparent 4px
    );
    pointer-events: none;
    z-index: -1;
}

.red-alert {
    background: repeating-linear-gradient(
        transparent,
        transparent 2px,
        rgba(255, 0, 60, 0.1) 3px,
        transparent 4px
    );
}
.green-alert {
    background: repeating-linear-gradient(
        transparent,
        transparent 2px,
        rgba(0, 255, 102, 0.1) 3px,
        transparent 4px
    );
}

/* Glitch Text Effect */
.glitch {
    font-size: 3rem;
    font-weight: 900;
    text-transform: uppercase;
    position: relative;
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
    margin-bottom: 10px;
    text-align: center;
}

.glitch.red { color: var(--neon-red); text-shadow: 0 0 10px var(--neon-red); }
.glitch.green { color: var(--neon-green); text-shadow: 0 0 10px var(--neon-green); }

.glitch::before, .glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-dark);
}

.glitch::before {
    left: 2px;
    text-shadow: -2px 0 red;
    clip: rect(24px, 550px, 90px, 0);
    animation: glitch-anim-2 3s infinite linear alternate-reverse;
}

.glitch::after {
    left: -2px;
    text-shadow: -2px 0 var(--neon-purple);
    clip: rect(85px, 550px, 140px, 0);
    animation: glitch-anim 2.5s infinite linear alternate-reverse;
}

@keyframes glitch-anim {
    0% { clip: rect(20px, 9999px, 83px, 0); }
    20% { clip: rect(61px, 9999px, 20px, 0); }
    40% { clip: rect(15px, 9999px, 95px, 0); }
    60% { clip: rect(102px, 9999px, 42px, 0); }
    80% { clip: rect(8px, 9999px, 72px, 0); }
    100% { clip: rect(44px, 9999px, 12px, 0); }
}

@keyframes glitch-anim-2 {
    0% { clip: rect(65px, 9999px, 100px, 0); }
    20% { clip: rect(15px, 9999px, 89px, 0); }
    40% { clip: rect(110px, 9999px, 34px, 0); }
    60% { clip: rect(48px, 9999px, 2px, 0); }
    80% { clip: rect(29px, 9999px, 66px, 0); }
    100% { clip: rect(84px, 9999px, 21px, 0); }
}

.subtitle {
    font-size: 1.5rem;
    color: var(--neon-purple);
    margin-bottom: 30px;
    text-shadow: 0 0 5px var(--neon-purple);
}

.instructions-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    padding: 20px;
    border-radius: 5px;
    max-width: 400px;
    margin-bottom: 30px;
    box-shadow: inset 0 0 20px rgba(0, 243, 255, 0.1), 0 0 15px rgba(0, 243, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.instructions-panel::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: var(--neon-blue);
    box-shadow: 0 0 10px var(--neon-blue);
}

.instructions-panel h3 {
    color: var(--neon-green);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.instructions-panel p {
    margin-bottom: 10px;
    font-size: 0.9rem;
    line-height: 1.4;
}

.instructions-panel ul {
    list-style: none;
}

.instructions-panel li {
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.instructions-panel li::before {
    content: '>';
    color: var(--neon-blue);
    margin-right: 5px;
}

.highlight {
    color: var(--neon-purple);
    font-weight: bold;
}

/* Cyber Button */
.cyber-btn {
    position: relative;
    background: transparent;
    color: var(--neon-blue);
    font-size: 1.2rem;
    padding: 15px 40px;
    border: 1px solid var(--neon-blue);
    text-transform: uppercase;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.3), inset 0 0 10px rgba(0, 243, 255, 0.1);
}

.cyber-btn:hover {
    background: rgba(0, 243, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.6), inset 0 0 20px rgba(0, 243, 255, 0.4);
    text-shadow: 0 0 5px var(--neon-blue);
}

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

.cyber-btn::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.4), transparent);
    animation: scan-line 2s infinite linear;
}

@keyframes scan-line {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Sound Toggle */
.sound-toggle-menu {
    margin-top: 20px;
    font-size: 0.9rem;
    color: #aaa;
}

.sound-toggle-menu label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.sound-toggle-menu input {
    display: none;
}

.custom-checkbox {
    width: 20px;
    height: 20px;
    border: 1px solid var(--neon-blue);
    margin-right: 10px;
    display: inline-block;
    position: relative;
}

.sound-toggle-menu input:checked + .custom-checkbox::after {
    content: '';
    position: absolute;
    top: 3px; left: 3px; width: 12px; height: 12px;
    background: var(--neon-green);
    box-shadow: 0 0 5px var(--neon-green);
}


/* HUD */
#hud {
    background: transparent;
    backdrop-filter: none;
    pointer-events: none; /* Let clicks pass through HUD background */
}

.top-bar {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
    width: 90%;
    max-width: 600px;
    pointer-events: auto;
}

.hud-item {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    padding: 10px 15px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
    position: relative;
}

.hud-item .icon {
    font-size: 1.2rem;
}

.hud-item .value {
    font-size: 1.2rem;
    font-weight: bold;
    font-family: 'Orbitron', sans-serif;
}

.hud-item .label {
    font-size: 0.7rem;
    color: #888;
    position: absolute;
    bottom: -15px;
    text-transform: uppercase;
}

.health-box .value { color: var(--neon-green); }
.resource-box .value { color: var(--neon-blue); text-shadow: 0 0 5px var(--neon-blue); }
.wave-box .value { color: var(--neon-purple); }

.health-bar-container {
    width: 60px;
    height: 10px;
    background: #222;
    border: 1px solid #444;
    border-radius: 2px;
    overflow: hidden;
}

.health-fill {
    width: 100%;
    height: 100%;
    background: var(--neon-green);
    box-shadow: 0 0 5px var(--neon-green);
    transition: width 0.3s ease, background 0.3s ease;
}


#btn-next-wave {
    position: absolute;
    bottom: 30px;
    right: 30px;
    padding: 10px 20px;
    font-size: 1rem;
    pointer-events: auto;
}

/* Context Menus (Build / Upgrade) */
.context-menu {
    position: absolute;
    background: var(--panel-bg);
    border: 1px solid var(--neon-purple);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(188, 19, 254, 0.3), inset 0 0 10px rgba(188, 19, 254, 0.1);
    pointer-events: auto;
    z-index: 200;
    /* Positioned via JS */
    min-width: 250px;
    transform: translate(-50%, -50%);
}

.context-menu.hidden {
    display: none;
}

.menu-header {
    text-align: center;
    color: var(--neon-purple);
    border-bottom: 1px solid #333;
    padding-bottom: 10px;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

/* Build Menu */
.tower-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.tower-option {
    background: rgba(255,255,255,0.05);
    border: 1px solid #333;
    border-radius: 4px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
}

.tower-option:hover {
    border-color: var(--neon-blue);
    background: rgba(0, 243, 255, 0.1);
}

.tower-option img {
    width: 50px;
    height: 50px;
    margin-bottom: 5px;
    filter: drop-shadow(0 0 5px currentColor);
}

.tower-option .name {
    font-size: 0.8rem;
    text-align: center;
    margin-bottom: 3px;
}

.tower-option .cost {
    font-size: 0.9rem;
    color: var(--neon-blue);
    font-weight: bold;
}

/* Upgrade Menu */
.upgrade-info {
    text-align: center;
    margin-bottom: 15px;
}

.upgrade-info .tower-name {
    display: block;
    font-size: 1.2rem;
    color: var(--neon-blue);
}

.upgrade-info .tower-lvl {
    color: var(--neon-green);
    font-size: 0.9rem;
}

.upgrade-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.action-btn {
    padding: 10px;
    background: transparent;
    border: 1px solid;
    cursor: pointer;
    font-family: 'Share Tech Mono', monospace;
    font-weight: bold;
    font-size: 1rem;
    transition: all 0.2s;
}

.action-btn.upgrade {
    border-color: var(--neon-green);
    color: var(--neon-green);
}
.action-btn.upgrade:hover {
    background: rgba(0, 255, 102, 0.1);
    box-shadow: 0 0 10px rgba(0, 255, 102, 0.3);
}

.action-btn.sell {
    border-color: var(--neon-red);
    color: var(--neon-red);
}
.action-btn.sell:hover {
    background: rgba(255, 0, 60, 0.1);
    box-shadow: 0 0 10px rgba(255, 0, 60, 0.3);
}

.close-btn {
    width: 100%;
    margin-top: 15px;
    padding: 8px;
    background: #222;
    border: none;
    color: #888;
    cursor: pointer;
    font-family: 'Share Tech Mono', monospace;
}
.close-btn:hover { background: #333; color: #fff; }

/* Responsive adjustments */
@media (max-width: 600px) {
    .glitch { font-size: 2rem; }
    .subtitle { font-size: 1rem; }
    .tower-options { grid-template-columns: 1fr; }
    .top-bar { width: 95%; gap: 10px; }
    .hud-item { padding: 5px; }
    .hud-item .value { font-size: 1rem; }
    .hud-item .icon { font-size: 1rem; }
    .health-bar-container { width: 40px; }
}