:root {
    --bg-color: #050508;
    --cyan: #00f0ff;
    --pink: #ff003c;
    --dark-glass: rgba(10, 10, 15, 0.7);
    --border-glass: rgba(0, 240, 255, 0.25);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Rajdhani', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: #fff;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Background Effects */
.overlay-background {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at center, #1a0b2e 0%, #050508 100%);
    z-index: -2;
}

.grid-background {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.08) 1px, transparent 1px);
    background-size: 50px 50px;
    transform: perspective(500px) rotateX(60deg) translateY(100px) scale(3);
    z-index: -1;
    animation: gridMove 10s linear infinite;
    transform-origin: bottom;
}

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

/* UI Container */
#ui-container {
    position: absolute;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 100%;
    padding-top: 5vh;
    pointer-events: none;
}

.game-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 5rem;
    font-weight: 900;
    text-align: center;
    line-height: 0.9;
    letter-spacing: 5px;
    color: transparent;
    -webkit-text-stroke: 2px var(--cyan);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
    margin-bottom: 2rem;
    animation: glitch 3s infinite;
}

@keyframes glitch {
    0%, 100% { text-shadow: 2px 0 var(--pink), -2px 0 var(--cyan); }
    50% { text-shadow: -2px 0 var(--pink), 2px 0 var(--cyan); }
}

/* Glass Panels */
.glass-panel {
    background: var(--dark-glass);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border-glass);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), inset 0 0 30px rgba(0, 240, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 400px;
    max-width: 90vw;
    pointer-events: auto;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

h2 {
    font-family: 'Orbitron', sans-serif;
    text-align: center;
    color: var(--cyan);
    letter-spacing: 2px;
}

/* Buttons */
.btn {
    position: relative;
    background: transparent;
    border: none;
    cursor: pointer;
    outline: none;
    padding: 0;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    letter-spacing: 2px;
    overflow: hidden;
    border-radius: 12px;
    display: block;
    width: 100%;
}

.btn-content {
    display: block;
    padding: 1.2rem 1.5rem;
    font-size: 1.2rem;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    transition: all 0.3s;
    border-radius: 12px;
    position: relative;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    z-index: 0;
    background: linear-gradient(45deg, var(--cyan), var(--pink), var(--cyan));
    background-size: 400%;
    animation: glowing 10s linear infinite;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.primary-btn::before, .action-btn::before {
    opacity: 1;
}
.primary-btn .btn-content, .action-btn .btn-content {
    background: rgba(0, 10, 15, 0.9);
}

.btn:hover::before { opacity: 1; }
.btn:hover .btn-content {
    background: transparent;
    color: #fff;
    text-shadow: 0 0 10px #fff;
}

.secondary-btn .btn-content { border: 2px solid var(--cyan); color: var(--cyan); }
.danger-btn .btn-content { border: 2px solid var(--pink); color: var(--pink); }
.back-btn .btn-content { border: 2px solid rgba(255,255,255,0.3); color: #fff; }

@keyframes glowing {
    0% { background-position: 0 0; }
    50% { background-position: 400% 0; }
    100% { background-position: 0 0; }
}

.divider {
    text-align: center;
    color: var(--cyan);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 4px;
    position: relative;
    opacity: 0.6;
}

.join-wrapper { display: flex; flex-direction: column; gap: 0.8rem; }

input[type="text"] {
    background: rgba(0, 0, 0, 0.7);
    border: 2px solid rgba(0, 240, 255, 0.3);
    padding: 1.2rem;
    font-size: 1.5rem;
    color: var(--cyan);
    text-align: center;
    border-radius: 12px;
    outline: none;
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 6px;
    box-shadow: inset 0 0 15px rgba(0, 240, 255, 0.1);
    transition: all 0.3s;
}

input[type="text"]:focus {
    border-color: var(--cyan);
    box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.3), 0 0 15px rgba(0, 240, 255, 0.4);
}

/* Host Panel */
.code-display {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.5rem;
    color: var(--cyan);
    text-align: center;
    letter-spacing: 8px;
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
    padding: 1.5rem;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(0, 240, 255, 0.3);
}

/* In-game UI */
#game-ui {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 800px;
    padding: 0 1rem;
    pointer-events: none;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
}

.score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    background: var(--dark-glass);
    padding: 0.5rem 1rem;
    border-radius: 15px;
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(15px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.score-box {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1;
}

.enemy-score { color: var(--pink); text-shadow: 0 0 20px var(--pink); }
.player-score { color: var(--cyan); text-shadow: 0 0 20px var(--cyan); }
.score-divider { 
    height: 2px; 
    width: 80%; 
    background: rgba(255,255,255,0.3);
    margin: 0.2rem 0;
    font-size: 0;
}

#btn-quit {
    width: auto;
    opacity: 0.3;
    transition: all 0.3s ease;
    pointer-events: auto;
}

#btn-quit:hover {
    opacity: 1;
    transform: scale(1.1);
}

.small-btn .btn-content {
    padding: 0.5rem 0.8rem;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

/* Countdown */
#countdown-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Orbitron', sans-serif;
    font-size: 8rem;
    font-weight: 900;
    color: var(--cyan);
    text-shadow: 0 0 40px var(--cyan), 0 0 20px var(--pink);
    z-index: 100;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Loader */
.loader {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(0, 240, 255, 0.2);
    border-radius: 50%;
    border-top-color: var(--cyan);
    animation: spin 1s ease-in-out infinite;
    margin: 1rem auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Helpers */
.hidden {
    opacity: 0 !important;
    pointer-events: none !important;
    position: absolute !important;
    z-index: -100 !important;
    transform: translateY(-30px) scale(0.9) !important;
}

/* Canvas Container */
#game-container {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

canvas {
    background: rgba(10, 10, 15, 0.7);
    border-radius: 30px;
    box-shadow: 0 0 60px rgba(0, 240, 255, 0.1), 0 0 120px rgba(255, 0, 60, 0.1);
    backdrop-filter: blur(8px);
    border: 2px solid rgba(255, 255, 255, 0.05);
}