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

body {
    overflow: hidden;
    background: #000;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    cursor: pointer;
    user-select: none;
}

#stars-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
}

#warp-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

#warp-overlay.active {
    opacity: 1;
}

.speed-line {
    position: absolute;
    background: linear-gradient(to right, rgba(200, 220, 255, 0.9), rgba(150, 200, 255, 0.5), transparent);
    height: 2px;
    transform-origin: left center;
    animation: speed-line-fade 0.4s ease-out forwards;
    --line-width: 200px;
}

@keyframes speed-line-fade {
    0% { opacity: 1; width: 0; }
    30% { opacity: 1; width: calc(var(--line-width) * 0.5); }
    100% { opacity: 0; width: var(--line-width); }
}

#universe {
    position: fixed;
    width: 100vw;
    height: 100vh;
    transition: transform 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center center;
    z-index: 1;
}

#stars-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.star {
    position: absolute;
    border-radius: 50%;
    background: white;
    box-shadow: 0 0 6px 2px rgba(255, 255, 255, 0.5);
    animation: twinkle var(--twinkle-duration, 3s) ease-in-out infinite;
}

.star.main {
    width: 12px;
    height: 12px;
    box-shadow: 0 0 20px 8px rgba(255, 255, 255, 0.8),
                0 0 40px 16px rgba(255, 255, 200, 0.4),
                0 0 60px 24px rgba(255, 255, 200, 0.2);
    z-index: 10;
}

.star.main::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.1) 30%, transparent 70%);
    border-radius: 50%;
    animation: pulse-corona 2s ease-in-out infinite;
}

.star.main::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 4px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 10px 5px white;
}

@keyframes pulse-corona {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.3; }
}

.star.blue { 
    background: #88ccff; 
    box-shadow: 0 0 20px 8px rgba(136, 204, 255, 0.8),
                0 0 40px 16px rgba(136, 204, 255, 0.4),
                0 0 60px 24px rgba(136, 204, 255, 0.2);
}
.star.blue::before { background: radial-gradient(circle, rgba(136,204,255,0.5) 0%, rgba(136,204,255,0.1) 30%, transparent 70%); }

.star.yellow { 
    background: #ffee88; 
    box-shadow: 0 0 20px 8px rgba(255, 238, 136, 0.8),
                0 0 40px 16px rgba(255, 238, 136, 0.4),
                0 0 60px 24px rgba(255, 238, 136, 0.2);
}
.star.yellow::before { background: radial-gradient(circle, rgba(255,238,136,0.5) 0%, rgba(255,238,136,0.1) 30%, transparent 70%); }

.star.red { 
    background: #ff8888; 
    box-shadow: 0 0 20px 8px rgba(255, 136, 136, 0.8),
                0 0 40px 16px rgba(255, 136, 136, 0.4),
                0 0 60px 24px rgba(255, 136, 136, 0.2);
}
.star.red::before { background: radial-gradient(circle, rgba(255,136,136,0.5) 0%, rgba(255,136,136,0.1) 30%, transparent 70%); }

.star.purple { 
    background: #cc88ff; 
    box-shadow: 0 0 20px 8px rgba(204, 136, 255, 0.8),
                0 0 40px 16px rgba(204, 136, 255, 0.4),
                0 0 60px 24px rgba(204, 136, 255, 0.2);
}
.star.purple::before { background: radial-gradient(circle, rgba(204,136,255,0.5) 0%, rgba(204,136,255,0.1) 30%, transparent 70%); }

.star.cyan { 
    background: #88ffff; 
    box-shadow: 0 0 20px 8px rgba(136, 255, 255, 0.8),
                0 0 40px 16px rgba(136, 255, 255, 0.4),
                0 0 60px 24px rgba(136, 255, 255, 0.2);
}
.star.cyan::before { background: radial-gradient(circle, rgba(136,255,255,0.5) 0%, rgba(136,255,255,0.1) 30%, transparent 70%); }
.star.white { background: #ffffff; box-shadow: 0 0 20px 8px rgba(255, 255, 255, 0.9); }
.star.orange { background: #ffaa66; box-shadow: 0 0 20px 8px rgba(255, 170, 102, 0.8); }
.star.pink { background: #ff88cc; box-shadow: 0 0 20px 8px rgba(255, 136, 204, 0.8); }

.planet {
    position: absolute;
    border-radius: 50%;
    z-index: 10;
}

.planet.earth {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #1a4d7c 0%, #2d7d4f 30%, #1a6b4d 50%, #1a4d7c 70%, #0d3a5c 100%);
    box-shadow: 0 0 30px 10px rgba(100, 180, 255, 0.4),
                inset -10px -10px 20px rgba(0,0,0,0.5);
    animation: rotate-planet 20s linear infinite;
}

.planet.earth::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 8px;
    width: 15px;
    height: 12px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    filter: blur(3px);
}

.planet.earth::after {
    content: '';
    position: absolute;
    width: 90px;
    height: 90px;
    top: -15px;
    left: -15px;
    border-radius: 50%;
    background: radial-gradient(circle, transparent 60%, rgba(100, 180, 255, 0.1) 100%);
}

.planet.saturn {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #e8c47c 0%, #c9a55c 50%, #a88c4a 100%);
    box-shadow: 0 0 25px 8px rgba(232, 196, 124, 0.3),
                inset -8px -8px 15px rgba(0,0,0,0.4);
}

.planet.saturn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotateX(75deg);
    width: 100px;
    height: 100px;
    border: 8px solid rgba(200, 180, 140, 0.4);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(200, 180, 140, 0.3);
}

.planet.mars {
    width: 35px;
    height: 35px;
    background: linear-gradient(135deg, #d4633a 0%, #a84520 50%, #8b3a1a 100%);
    box-shadow: 0 0 20px 6px rgba(212, 99, 58, 0.4),
                inset -6px -6px 12px rgba(0,0,0,0.4);
}

@keyframes twinkle {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.3; transform: scale(0.8); }
}

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

/* Spaceship */
#spaceship {
    position: absolute;
    width: 40px;
    height: 60px;
    z-index: 100;
    filter: drop-shadow(0 0 10px rgba(255, 150, 50, 0.5));
    transform: translate(-50%, -50%);
}

.ship-body {
    position: absolute;
    width: 20px;
    height: 40px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(180deg, #e0e0e0 0%, #a0a0a0 50%, #707070 100%);
    border-radius: 50% 50% 20% 20% / 60% 60% 20% 20%;
    box-shadow: inset 2px 0 5px rgba(255,255,255,0.3),
                inset -2px 0 5px rgba(0,0,0,0.3);
}

.ship-body::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    background: radial-gradient(circle, #00ffff 0%, #0088aa 100%);
    border-radius: 50%;
    box-shadow: 0 0 8px #00ffff;
}

.ship-wing {
    position: absolute;
    width: 15px;
    height: 25px;
    top: 20px;
    background: linear-gradient(180deg, #c0c0c0 0%, #808080 100%);
    clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.ship-wing.left {
    left: -5px;
    transform: scaleX(-1);
}

.ship-wing.right {
    right: -5px;
}

.ship-flame {
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #ffaa00 30%, #ff5500 70%, transparent 100%);
    border-radius: 50% 50% 50% 50% / 30% 30% 70% 70%;
    animation: flame-flicker 0.1s ease-in-out infinite alternate;
    opacity: 0;
    transition: opacity 0.3s;
}

.ship-flame.active {
    opacity: 1;
}

@keyframes flame-flicker {
    from { transform: translateX(-50%) scaleY(0.9) scaleX(0.95); }
    to { transform: translateX(-50%) scaleY(1.1) scaleX(1.05); }
}

#spaceship.orbiting {
    animation: orbit 8s linear infinite;
}

@keyframes orbit {
    from { transform: translate(-50%, -50%) rotate(0deg) translateX(80px) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg) translateX(80px) rotate(-360deg); }
}

/* Title Screen */
#title-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 200;
    background: radial-gradient(ellipse at center, rgba(10, 10, 26, 0.9) 0%, rgba(0, 0, 5, 0.95) 100%);
    transition: opacity 1s ease-out;
}

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

#main-title {
    font-size: 4rem;
    color: white;
    text-shadow: 0 0 20px rgba(100, 180, 255, 0.8),
                 0 0 40px rgba(100, 180, 255, 0.4);
    letter-spacing: 0.3em;
    animation: title-glow 3s ease-in-out infinite;
    margin-bottom: 20px;
}

@keyframes title-glow {
    0%, 100% { text-shadow: 0 0 20px rgba(100, 180, 255, 0.8), 0 0 40px rgba(100, 180, 255, 0.4); }
    50% { text-shadow: 0 0 30px rgba(150, 200, 255, 1), 0 0 60px rgba(150, 200, 255, 0.6); }
}

/* Debug banner (visible if JS not running or for status) */
#debug-status {
    pointer-events: none;
}

#subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 60px;
    letter-spacing: 0.2em;
}

#start-btn {
    padding: 15px 50px;
    font-size: 1.1rem;
    color: white;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 30px;
    cursor: pointer;
    letter-spacing: 0.15em;
    transition: all 0.3s ease;
    animation: pulse-btn 2s ease-in-out infinite;
}

#start-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: scale(1.05);
}

@keyframes pulse-btn {
    0%, 100% { box-shadow: 0 0 10px rgba(255, 255, 255, 0.3); }
    50% { box-shadow: 0 0 25px rgba(255, 255, 255, 0.5); }
}

/* Message Box */
#message-box {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    max-width: 600px;
    padding: 25px 40px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    z-index: 150;
    opacity: 1;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

#message-box.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

#message-text {
    color: white;
    font-size: 1.2rem;
    line-height: 1.8;
    text-align: center;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

/* Final Screen */
#final-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1s ease;
}

#final-screen:not(.hidden) {
    opacity: 1;
}

#final-message {
    max-width: 700px;
    padding: 40px 60px;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(100, 180, 255, 0.3);
    border-radius: 20px;
    backdrop-filter: blur(15px);
    color: white;
    font-size: 1.5rem;
    line-height: 2;
    text-align: center;
    text-shadow: 0 0 15px rgba(100, 180, 255, 0.5);
    animation: final-glow 4s ease-in-out infinite;
}

@keyframes final-glow {
    0%, 100% { border-color: rgba(100, 180, 255, 0.3); box-shadow: 0 0 30px rgba(100, 180, 255, 0.2); }
    50% { border-color: rgba(150, 200, 255, 0.5); box-shadow: 0 0 50px rgba(150, 200, 255, 0.3); }
}

/* Nebula Effect */
.nebula {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.12;
    pointer-events: none;
    animation: nebula-pulse 8s ease-in-out infinite;
}

/* Nebula clusters used in place of small star boxes */
.nebula-cluster {
    mix-blend-mode: screen;
    transition: transform 6s ease-in-out;
    z-index: 5;
    will-change: transform;
    /* animate scale only; opacity is controlled per-element inline to avoid being overridden */
    animation: nebula-pulse 8s ease-in-out infinite;
}

.nebula-cluster:hover {
    transform: scale(1.03);
}

@keyframes nebula-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Shooting Stars */
.shooting-star {
    position: absolute;
    height: 3px;
    width: 3px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0 0 8px 2px rgba(255, 255, 255, 0.8), 0 0 16px 4px #fff, 0 0 24px 6px #00aeff;
    animation: shoot var(--duration, 1.5s) ease-in-out forwards;
    transform: rotate(var(--angle, -30deg));
    z-index: 101;
}

.shooting-star::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateY(-50%);
    width: var(--tail-length, 150px);
    height: 1px;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.8), transparent);
    opacity: 0.8;
}

@keyframes shoot {
    0% {
        transform: translate(0, 0) scale(0.5) rotate(var(--angle, -30deg));
        opacity: 1;
    }
    80% {
        opacity: 1;
    }
    100% {
        transform: translate(var(--end-x, 800px), var(--end-y, 600px)) scale(1.2) rotate(var(--angle, -30deg));
        opacity: 0;
    }
}

/* Asteroids */
.asteroid {
    position: absolute;
    background: radial-gradient(ellipse at 30% 30%, 
        #8b7355 0%, 
        #6b5344 30%, 
        #4a3a2f 60%, 
        #3a2a20 100%);
    border-radius: 45% 55% 60% 40% / 50% 45% 55% 50%;
    box-shadow: 
        inset -5px -5px 15px rgba(0,0,0,0.6),
        inset 3px 3px 8px rgba(180, 160, 140, 0.3),
        0 0 10px rgba(100, 80, 60, 0.4);
    opacity: 0.9;
    pointer-events: none;
}

.asteroid::before {
    content: '';
    position: absolute;
    width: 20%;
    height: 20%;
    background: rgba(60, 50, 40, 0.8);
    border-radius: 50%;
    top: 25%;
    left: 20%;
    box-shadow: 
        15px 10px 0 5px rgba(50, 40, 30, 0.6),
        -5px 20px 0 3px rgba(70, 55, 40, 0.5);
}

/* Distant Galaxies */
.distant-galaxy {
    position: absolute;
    border-radius: 50%;
    opacity: 0.4;
    filter: blur(2px);
    animation: galaxy-twinkle 6s ease-in-out infinite;
}

.distant-galaxy::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 40%;
    transform: translate(-50%, -50%) rotate(var(--galaxy-angle, 30deg));
    background: inherit;
    border-radius: 50%;
    filter: blur(3px);
    opacity: 0.6;
}

@keyframes galaxy-twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.5; }
}

/* Comet */
.comet {
    position: absolute;
    width: 8px;
    height: 8px;
    background: radial-gradient(circle, white 0%, rgba(200, 220, 255, 0.8) 40%, transparent 70%);
    border-radius: 50%;
    animation: comet-fly 8s linear forwards;
    opacity: 0;
}

.comet::before {
    content: '';
    position: absolute;
    top: 50%;
    right: 100%;
    transform: translateY(-50%);
    width: 120px;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(200, 220, 255, 0.3), rgba(255, 255, 255, 0.6));
    border-radius: 2px;
}

@keyframes comet-fly {
    0% { transform: translate(0, 0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translate(calc(100vw + 200px), calc(50vh)); opacity: 0; }
}

/* Star Cluster */
.cluster-star {
    position: absolute;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 4px white;
    animation: cluster-twinkle 2s ease-in-out infinite;
    pointer-events: none;
}

@keyframes cluster-twinkle {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* Responsive */
@media (max-width: 768px) {
    #main-title { font-size: 2.5rem; }
    #subtitle { font-size: 1rem; }
    #message-box { max-width: 90%; padding: 20px; }
    #message-text { font-size: 1rem; }
    #final-message { max-width: 90%; padding: 25px 30px; font-size: 1.2rem; }
}