/* concengine.com - Concurrent Process Visualization */

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

:root {
    --canvas: #0B0F19;
    --lane-track: #1E293B;
    --teal: #06D6A0;
    --amber: #F59E0B;
    --sync-white: #E8ECF1;
    --merge-rose: #F43F5E;
    --deadlock: #991B1B;
    --text-primary: #CBD5E1;
    --text-secondary: #94A3B8;
    --charcoal: #1E293B;
    --cyan: #22D3EE;
    --engine-speed: 1;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--canvas);
}

/* Grid underlay */
.grid-underlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background:
        repeating-linear-gradient(0deg, var(--charcoal) 0px, transparent 1px, transparent 80px),
        repeating-linear-gradient(90deg, var(--charcoal) 0px, transparent 1px, transparent 80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}

/* Engine canvas */
.engine-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}

/* Lanes */
.lane {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
}

.lane-track {
    width: 100%;
    height: 1px;
    background: var(--lane-track);
    position: absolute;
    top: 0;
}

.lane-track::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 200%;
    height: 100%;
    background: repeating-linear-gradient(90deg, var(--lane-track) 0px, var(--lane-track) 8px, transparent 8px, transparent 16px);
    animation: dashFlow calc(2s / var(--engine-speed)) linear infinite;
}

@keyframes dashFlow {
    from { transform: translateX(0); }
    to { transform: translateX(-16px); }
}

.lane-label {
    position: absolute;
    left: 8px;
    top: -16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--charcoal);
    letter-spacing: 0.05em;
    opacity: 0.6;
}

/* Tokens */
.token {
    position: absolute;
    width: 24px;
    height: 24px;
    top: -12px;
    will-change: transform;
    animation: tokenMove calc(var(--speed) / var(--engine-speed)) linear var(--delay) infinite;
}

.token-teal {
    background: var(--teal);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(6, 214, 160, 0.4);
}

.token-amber {
    background: var(--amber);
    transform: rotate(45deg);
    border-radius: 3px;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
    width: 20px;
    height: 20px;
    top: -10px;
}

@keyframes tokenMove {
    from { left: -40px; }
    to { left: calc(100vw + 40px); }
}

/* Sync barriers */
.sync-barrier {
    position: absolute;
    top: 10%;
    height: 80%;
    width: 2px;
    background: var(--sync-white);
    opacity: 0.4;
    animation: barrierPulse calc(4s / var(--engine-speed)) ease-in-out infinite;
}

@keyframes barrierPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 0.7; transform: scaleY(1.02); }
}

.sync-label {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--sync-white);
    opacity: 0.5;
    letter-spacing: 0.08em;
}

/* Fork/Join nodes */
.fork-node, .join-node {
    position: absolute;
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--merge-rose);
    transform: rotate(45deg);
    animation: nodeRotate calc(8s / var(--engine-speed)) linear infinite;
}

@keyframes nodeRotate {
    to { transform: rotate(405deg); }
}

.node-label {
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%) rotate(-45deg);
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--merge-rose);
    opacity: 0.6;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

/* Central inscription */
.central-inscription {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
}

.domain-name {
    font-family: 'Chakra Petch', sans-serif;
    font-size: clamp(3rem, 10vw, 8rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--sync-white);
    line-height: 1;
    opacity: 0.6;
    transition: opacity 2s ease;
}

.domain-tld {
    font-family: 'Chakra Petch', sans-serif;
    font-size: clamp(1rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--cyan);
    display: block;
    margin-top: 0.3rem;
}

.tagline {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(0.85rem, 1.5vw, 1.1rem);
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    margin-top: 1rem;
    opacity: 0;
    transition: opacity 1s ease;
}

.tagline.visible { opacity: 1; }

/* Concept labels */
.concept-label {
    position: absolute;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.06em;
    opacity: 0;
    transition: opacity 1s ease;
    z-index: 5;
}

.concept-label.visible { opacity: 0.7; }

/* Clock HUD */
.clock-hud {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.2rem;
}

.hud-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--charcoal);
    letter-spacing: 0.1em;
}

.hud-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    color: var(--teal);
    text-shadow: 0 0 6px rgba(6, 214, 160, 0.3);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,*::before,*::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
    .token { display: none; }
    .domain-name { opacity: 1; }
    .tagline { opacity: 1; }
    .concept-label { opacity: 0.7; }
}