:root {
    --primary: #0ff;
    --secondary: #f0f;
    --dark: #050505;
    --text: #e0e0e0;
    --grid-color: rgba(0, 255, 255, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--dark);
    color: var(--text);
    font-family: 'Share Tech Mono', monospace;
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
}

/* Background Scene */
.scene {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -2;
    overflow: hidden;
}

.cyber-grid {
    position: absolute;
    bottom: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: 
        linear-gradient(transparent 95%, var(--grid-color) 100%),
        linear-gradient(90deg, transparent 95%, var(--grid-color) 100%);
    background-size: 50px 50px;
    transform: rotateX(75deg);
    transform-origin: center center;
    animation: gridMove 10s linear infinite;
}

@keyframes gridMove {
    0% { transform: rotateX(75deg) translateY(0); }
    100% { transform: rotateX(75deg) translateY(50px); }
}

.ambient-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,255,255,0.1) 0%, transparent 70%);
    z-index: -1;
}

/* HUD Overlay */
.hud-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
    padding: 20px;
    font-size: 12px;
    color: var(--primary);
    text-shadow: 0 0 5px var(--primary);
}

.hud-top-left { position: absolute; top: 20px; left: 20px; }
.hud-top-right { position: absolute; top: 20px; right: 20px; }
.hud-bottom-left { position: absolute; bottom: 20px; left: 20px; }
.hud-bottom-right { position: absolute; bottom: 20px; right: 20px; }

/* Main UI Container */
.ui-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    z-index: 10;
}

/* 3D Reactor Cube */
.reactor {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cube-wrapper {
    perspective: 800px;
}

.cube {
    width: 100px;
    height: 100px;
    position: relative;
    transform-style: preserve-3d;
    animation: rotateCube 15s infinite linear;
}

.face {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(0, 255, 255, 0.1);
    border: 2px solid var(--primary);
    box-shadow: 0 0 20px inset var(--primary), 0 0 20px var(--primary);
    display: flex;
    justify-content: center;
    align-items: center;
}

.face::before {
    content: '';
    width: 50%; height: 50%;
    border: 1px solid var(--primary);
    border-radius: 50%;
}

.front  { transform: translateZ(50px); }
.back   { transform: rotateY(180deg) translateZ(50px); }
.right  { transform: rotateY(90deg) translateZ(50px); }
.left   { transform: rotateY(-90deg) translateZ(50px); }
.top    { transform: rotateX(90deg) translateZ(50px); }
.bottom { transform: rotateX(-90deg) translateZ(50px); }

@keyframes rotateCube {
    0% { transform: rotateX(0) rotateY(0) rotateZ(0); }
    100% { transform: rotateX(360deg) rotateY(360deg) rotateZ(360deg); }
}

.rings .ring {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(255, 0, 255, 0.5);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--secondary);
}

.ring1 { width: 160px; height: 160px; animation: spin 4s linear infinite; border-top: 2px solid var(--secondary); }
.ring2 { width: 180px; height: 180px; animation: spin 6s linear infinite reverse; border-right: 2px solid var(--secondary); }
.ring3 { width: 200px; height: 200px; animation: spin 8s linear infinite; border-bottom: 2px solid var(--secondary); }

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Terminal */
.terminal {
    width: 400px;
    height: 150px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid var(--primary);
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
    backdrop-filter: blur(5px);
}

.terminal-header {
    background: rgba(0, 255, 255, 0.2);
    padding: 5px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--primary);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }
.title { margin-left: 10px; font-size: 14px; font-weight: bold; }

.terminal-body {
    padding: 10px;
    font-size: 13px;
    line-height: 1.5;
    height: calc(100% - 30px);
    overflow-y: auto;
    color: #a0f0a0;
}

/* Cyber Button */
.action-wrapper {
    text-align: center;
}

.cyber-btn {
    position: relative;
    padding: 15px 40px;
    font-family: 'Orbitron', sans-serif;
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    background: transparent;
    border: none;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    outline: none;
}

.cyber-btn::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--primary);
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
    z-index: -1;
    transition: all 0.3s ease;
}

.cyber-btn::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: transparent;
    border: 2px solid var(--primary);
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
    z-index: -2;
    transform: translate(5px, 5px);
    transition: all 0.3s ease;
}

.cyber-btn:hover::before {
    background: var(--secondary);
    box-shadow: 0 0 20px var(--secondary);
}

.cyber-btn:hover::after {
    border-color: var(--secondary);
    transform: translate(0, 0);
}

.cyber-btn:hover {
    color: #fff;
    text-shadow: 0 0 5px #fff;
}

#enter-btn {
    --primary: #27c93f;
    --secondary: #00ff00;
    color: var(--primary);
}

#enter-btn::before {
    background: rgba(39, 201, 63, 0.2);
}

#enter-btn::after {
    border-color: var(--primary);
}

#enter-btn:hover::before {
    background: var(--secondary);
    box-shadow: 0 0 20px var(--secondary);
}

#enter-btn:hover::after {
    border-color: var(--secondary);
}

.status-msg {
    margin-top: 15px;
    font-size: 14px;
    color: var(--secondary);
    letter-spacing: 3px;
    animation: blink 2s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@media (max-width: 600px) {
    .terminal { width: 90vw; }
    .reactor { transform: scale(0.8); }
}