:root {
    --void-black: #08080F;
    --magenta-flare: #FF2D6F;
    --cyan-pulse: #00F0FF;
    --neon-chartreuse: #BBFF00;
    --gilded-amber: #FFB830;
    --ultraviolet: #7B2FBE;
    --bone-white: #F0EDE6;
    --smoke-gray: #9A95A0;
    color-scheme: dark;
}

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

body {
    background-color: var(--void-black);
    color: var(--bone-white);
    font-family: 'Outfit', sans-serif;
    font-weight: 300;
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    line-height: 1.72;
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

/* Brand sigil */
.sigil {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    mix-blend-mode: screen;
}

.sigil-svg {
    width: 40px;
    height: 40px;
}

/* Epoch indicator */
.epoch-indicator {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 80;
}

.epoch-dash {
    width: 20px;
    height: 2px;
    background: var(--smoke-gray);
    opacity: 0.3;
    transition: opacity 0.4s ease, background 0.4s ease, width 0.4s ease;
    display: block;
}

.epoch-dash.active {
    opacity: 1;
    background: var(--neon-chartreuse);
    width: 28px;
}

/* Timeline spine */
.timeline-spine {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    transform: translateX(-50%);
    z-index: 5;
    pointer-events: none;
}

.spine-line {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--magenta-flare), var(--cyan-pulse), var(--magenta-flare));
    background-size: 100% 300%;
    animation: spineBreathe 4s ease-in-out infinite, spineShift 8s ease-in-out infinite;
}

@keyframes spineBreathe {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes spineShift {
    0%, 100% { background-position: 0% 0%; }
    50% { background-position: 0% 100%; }
}

/* Timeline nodes */
.timeline-node {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 18px;
    height: 18px;
    border-radius: 50%;
    z-index: 10;
    top: 40px;
}

.node-magenta {
    background: radial-gradient(circle, #fff 20%, var(--magenta-flare) 70%, transparent 100%);
    box-shadow: 0 0 12px var(--magenta-flare), 0 0 24px rgba(255, 45, 111, 0.3);
}

.node-cyan {
    background: radial-gradient(circle, #fff 20%, var(--cyan-pulse) 70%, transparent 100%);
    box-shadow: 0 0 12px var(--cyan-pulse), 0 0 24px rgba(0, 240, 255, 0.3);
}

/* Epochs */
.epoch {
    position: relative;
    min-height: 100vh;
    padding: 80px 0 60px;
}

.epoch-final {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Epoch title block */
.epoch-title-block {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
    z-index: 10;
}

.epoch-num {
    font-family: 'Space Mono', monospace;
    font-size: clamp(0.75rem, 1.2vw, 0.9rem);
    letter-spacing: 0.06em;
    color: var(--cyan-pulse);
    display: block;
    margin-bottom: 8px;
}

.epoch-title {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: clamp(2.8rem, 7vw, 5.6rem);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    line-height: 1.05;
    color: var(--bone-white);
}

/* Content panels */
.panel {
    position: relative;
    z-index: 10;
    max-width: 42%;
    padding: 32px;
    margin-bottom: 32px;
}

.panel-left {
    margin-left: 4%;
    margin-right: auto;
    text-align: left;
}

.panel-right {
    margin-left: auto;
    margin-right: 4%;
    text-align: left;
}

.panel-center {
    margin: 0 auto;
    max-width: 60%;
    text-align: center;
}

/* Panel borders */
.panel-border {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
}

.panel-left .panel-border {
    right: -16px;
    background: linear-gradient(180deg, var(--magenta-flare), transparent);
    opacity: 0.4;
}

.panel-right .panel-border {
    left: -16px;
    background: linear-gradient(180deg, var(--cyan-pulse), transparent);
    opacity: 0.4;
}

.border-chartreuse {
    background: linear-gradient(180deg, var(--neon-chartreuse), transparent) !important;
}

.border-gilded {
    background: linear-gradient(180deg, var(--gilded-amber), transparent) !important;
}

/* Body text */
.body-text {
    font-family: 'Outfit', sans-serif;
    font-weight: 300;
    max-width: 38em;
    margin-bottom: 1rem;
    line-height: 1.72;
}

/* Data readouts */
.data-readout {
    font-family: 'Space Mono', monospace;
    font-size: clamp(0.7rem, 1vw, 0.85rem);
    letter-spacing: 0.06em;
    color: var(--cyan-pulse);
    display: block;
    margin-top: 16px;
    opacity: 0.8;
}

.data-readout-center {
    text-align: center;
}

/* Final line */
.final-line {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 4rem);
    text-transform: uppercase;
    letter-spacing: 0.10em;
    line-height: 1.15;
    color: var(--bone-white);
    margin-bottom: 24px;
}

/* Orbit map */
.orbit-map {
    position: relative;
    z-index: 8;
    display: flex;
    justify-content: center;
    margin: 40px 0;
}

.orbit-map canvas {
    max-width: 400px;
    width: 100%;
    height: auto;
}

/* Epoch gateways */
.epoch-gateway {
    height: 120px;
    position: relative;
    overflow: hidden;
}

.epoch-gateway::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(90deg, var(--magenta-flare), var(--ultraviolet), var(--cyan-pulse));
    transition: width 0.6s ease;
}

.epoch-gateway.expanded::before {
    width: 100vw;
    opacity: 0.15;
}

/* Spine terminus */
.spine-terminus {
    height: 200px;
    position: relative;
}

/* Stagger animation */
[data-stagger] {
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

[data-stagger].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .panel {
        max-width: 80%;
        margin-left: 10%;
        margin-right: 10%;
    }

    .panel-left,
    .panel-right {
        margin-left: 10%;
        margin-right: 10%;
    }

    .panel-border {
        display: none;
    }

    .epoch-indicator {
        display: none;
    }

    .timeline-spine {
        left: 16px;
        transform: none;
    }

    .timeline-node {
        left: 16px;
        transform: translateX(-50%);
    }

    .epoch-title {
        font-size: clamp(1.8rem, 6vw, 3rem);
    }

    .panel-center {
        max-width: 85%;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .spine-line {
        animation: none;
        opacity: 0.8;
    }

    [data-stagger] {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .epoch-gateway::before {
        transition: none;
    }
}