:root {
    --azure: #00A1FF;
    --yellow: #e9d958;
    --bg: #0d0d0d;
    --fg: #f5f5f5;
    --card: #1c1c1c;
    --border: #27272a;
    --muted: #27272a;
    --muted-fg: #a1a1aa;
    --reactor-glow: #4080ff;
    --reactor-warm: #ff6030;
    color-scheme: dark;
}

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

html {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--fg);
    font-size: 16px;
    line-height: 1.75;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
}

a {
    color: var(--azure);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

::selection {
    background: var(--azure);
    color: var(--bg);
}

/* ── Header ─────────────────────────────────────────────── */

.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.header-content {
    max-width: 960px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--fg);
}

.logo:hover {
    text-decoration: none;
}

.logo span {
    color: var(--yellow);
}

.logo-sprite {
    height: 28px;
    width: 28px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.logo-gif {
    height: 28px;
    width: auto;
    border-radius: 4px;
}

.logo-gif:hover {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--muted-fg);
    font-size: 0.875rem;
}

.nav-links a:hover {
    color: var(--azure);
    text-decoration: none;
}

/* ── Main ───────────────────────────────────────────────── */

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem 0;
    position: relative;
}

#game-canvas {
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    border: 1px solid var(--border);
}

/* ── Loading screen ─────────────────────────────────────── */

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
}

.loading-icon-row {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.loading-sprite {
    width: 32px;
    height: 32px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    animation: fuel-pulse 2s ease-in-out infinite;
}

.loading-sprite:nth-child(1) { animation-delay: 0s; }
.loading-sprite:nth-child(2) { animation-delay: 0.15s; }
.loading-sprite:nth-child(3) { animation-delay: 0.3s; }
.loading-sprite:nth-child(4) { animation-delay: 0.45s; }
.loading-sprite:nth-child(5) { animation-delay: 0.6s; }

@keyframes fuel-pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.15); }
}

#loading h1 {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 16px;
    color: var(--fg);
}

#loading-bar-container {
    width: 300px;
    height: 6px;
    background: var(--muted);
    border-radius: 3px;
    overflow: hidden;
    margin: 0 auto 12px;
}

#loading-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--reactor-glow), var(--azure));
    transition: width 0.2s;
}

#loading-status {
    font-size: 0.8125rem;
    color: var(--muted-fg);
}

/* ── Footer ─────────────────────────────────────────────── */

.footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    margin-top: auto;
}

.footer-content {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-mixy {
    height: 32px;
    width: auto;
    border-radius: 4px;
    transition: opacity 0.2s;
}

.footer-mixy:hover {
    opacity: 0.8;
}

.footer-text {
    color: var(--muted-fg);
    font-size: 0.875rem;
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.footer-right a {
    color: var(--azure);
}

.footer-right a:hover {
    color: var(--fg);
}

.footer-sep {
    color: var(--muted-fg);
}

/* ── Hidden ─────────────────────────────────────────────── */

#file-input {
    display: none;
}

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}