:root {
    --deep-void: #0d0d0f;
    --gunmetal-surface: #1a1a1e;
    --polished-steel: #b8b8c0;
    --brushed-aluminum: #9a9a9e;
    --chrome-highlight: #e8e8f0;
    --liquid-mercury: #d0d0d8;
    --gate-red: #8a2230;
    --fog-white: #f2f2f5;
    --soft-silver: #e0e0e0;
    --light-ink: #2a2a2a;
    --body-dark: #c8c8c8;
    --body-light: #3a3a3a;
    --muted-chrome: #7a7a7a;
    --medium-silver: #9a9a9a;
    --dark-grid-fragment: #2a2a2e;
    --pillar-hairline: #b0b0b0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    background: var(--deep-void);
    color: var(--body-dark);
    font-family: "DM Sans", Inter, sans-serif;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    font-weight: 400;
    line-height: 1.85;
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

.monogram {
    position: fixed;
    top: 2rem;
    left: 2rem;
    z-index: 20;
    color: var(--gate-red);
    font-size: 2rem;
    line-height: 1;
    mix-blend-mode: difference;
}

.fixed-pillar {
    position: fixed;
    top: 0;
    right: 16vw;
    z-index: 16;
    width: 1px;
    height: 100vh;
    background: var(--polished-steel);
    opacity: 0.15;
}

.progress-dot {
    position: absolute;
    top: 0;
    left: -1.5px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--gate-red);
}

.circle-of-emptiness {
    position: fixed;
    top: 50%;
    right: 8vw;
    z-index: 2;
    width: 30vw;
    height: 30vw;
    min-width: 260px;
    min-height: 260px;
    border: 1px solid var(--brushed-aluminum);
    border-radius: 50%;
    transform: translateY(-50%) rotate(0deg);
    transition: border-color 900ms ease-out;
    pointer-events: none;
}
.circle-of-emptiness.red-shift { border-color: var(--gate-red); }

.passage {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}
.passage::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}
.passage-dark {
    background-color: var(--deep-void);
    background-image: radial-gradient(ellipse at 30% 20%, rgba(184,184,192,0.08), transparent 70%), linear-gradient(105deg, rgba(255,255,255,0.03), transparent 42%);
}
.passage-dark::after { background: repeating-linear-gradient(90deg, transparent 0 96px, rgba(42,42,46,0.25) 97px, transparent 98px); opacity: 0.16; }
.passage-light {
    color: var(--body-light);
    background-color: var(--fog-white);
    background-image: radial-gradient(ellipse at 70% 80%, rgba(26,26,30,0.06), transparent 70%), linear-gradient(110deg, rgba(184,184,192,0.16), transparent 44%);
}
.passage-light::after { background: repeating-linear-gradient(90deg, transparent 0 96px, rgba(26,26,30,0.12) 97px, transparent 98px); opacity: 0; transition: opacity 250ms ease; }
.passage-light:hover::after { opacity: 1; }

.section-inner {
    position: relative;
    z-index: 5;
    width: min(680px, 74vw);
    margin-left: 8vw;
    padding-top: 12vh;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease-out, transform 600ms ease-out;
}
.section-inner.visible { opacity: 1; transform: translateY(0); }

.display-title {
    font-family: "Bebas Neue", Impact, sans-serif;
    font-size: clamp(3rem, 7vw, 6.5rem);
    font-weight: 400;
    letter-spacing: 0.18em;
    line-height: 0.92;
    text-transform: uppercase;
    color: var(--soft-silver);
    background: linear-gradient(90deg, var(--polished-steel) 0%, var(--chrome-highlight) 45%, var(--polished-steel) 55%, var(--brushed-aluminum) 100%);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: metallic-shimmer 8s linear infinite;
}
.passage-light .display-title { color: var(--light-ink); -webkit-text-fill-color: var(--light-ink); background: none; animation: none; }
.hero .section-inner { padding-top: 12vh; }
.passage-title { margin-bottom: 7vh; }

.kicker, .section-number, .return-label {
    font-family: "Space Mono", "Courier New", monospace;
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted-chrome);
}
.section-number {
    position: absolute;
    top: 12vh;
    left: -5vw;
    color: var(--gate-red);
}
.hero-line {
    margin-top: 3rem;
    font-weight: 300;
    font-size: clamp(0.9rem, 1.8vw, 1.3rem);
    letter-spacing: 0.25em;
    line-height: 1.6;
    text-transform: uppercase;
    color: var(--brushed-aluminum);
}
.body-copy { max-width: 52ch; margin-bottom: 1.45rem; color: var(--body-dark); }
.passage-light .body-copy { color: var(--body-light); }

.gate-mark { display: flex; gap: 3px; height: 40vh; margin-bottom: 5vh; }
.gate-mark span { display: block; width: 3px; height: 40vh; background: linear-gradient(to bottom, transparent, var(--polished-steel), transparent); }
.small-gate { position: absolute; left: 8vw; display: flex; gap: 3px; }
.small-gate::before, .small-gate::after { content: ""; width: 3px; height: 20px; background: linear-gradient(to bottom, transparent, var(--polished-steel), transparent); }

.particles i {
    position: absolute;
    z-index: 3;
    top: -8vh;
    width: 2px;
    height: 2px;
    border-radius: 50%;
    background: var(--polished-steel);
    opacity: 0.4;
    animation: dust-drift 26s linear infinite;
}
.particles i:nth-child(1) { left: 7%; animation-duration: 15s; }
.particles i:nth-child(2) { left: 14%; animation-duration: 40s; animation-delay: -8s; }
.particles i:nth-child(3) { left: 19%; animation-duration: 22s; animation-delay: -3s; }
.particles i:nth-child(4) { left: 27%; animation-duration: 34s; animation-delay: -14s; }
.particles i:nth-child(5) { left: 35%; animation-duration: 18s; animation-delay: -6s; }
.particles i:nth-child(6) { left: 42%; animation-duration: 29s; animation-delay: -10s; }
.particles i:nth-child(7) { left: 48%; animation-duration: 21s; animation-delay: -2s; }
.particles i:nth-child(8) { left: 54%; animation-duration: 37s; animation-delay: -18s; }
.particles i:nth-child(9) { left: 61%; animation-duration: 24s; animation-delay: -7s; }
.particles i:nth-child(10) { left: 68%; animation-duration: 31s; animation-delay: -12s; }
.particles i:nth-child(11) { left: 73%; animation-duration: 19s; animation-delay: -5s; }
.particles i:nth-child(12) { left: 79%; animation-duration: 35s; animation-delay: -17s; }
.particles i:nth-child(13) { left: 84%; animation-duration: 27s; animation-delay: -9s; }
.particles i:nth-child(14) { left: 91%; animation-duration: 39s; animation-delay: -21s; }
.particles i:nth-child(15) { left: 96%; animation-duration: 16s; animation-delay: -4s; }

.breathing-gap {
    position: relative;
    height: 120px;
    display: grid;
    place-items: center;
    background: var(--deep-void);
}
.breathing-gap.light-gap { background: var(--fog-white); }
.center-rule, .return-rule { width: 0; height: 1px; background: var(--brushed-aluminum); transition: width 700ms ease-out; }
.center-rule.visible { width: 40%; }

.void-inner { min-height: 100vh; display: grid; align-content: center; padding-top: 0; }
.void-line { font-weight: 300; font-size: clamp(1.2rem, 2vw, 1.8rem); color: var(--body-dark); }
.return-inner { min-height: 100vh; display: grid; place-items: center; align-content: center; gap: 2rem; margin-left: 0; width: 100%; padding-top: 0; }
.return-rule.visible { width: 120px; }
.closing-glyph { color: var(--gate-red); font-size: clamp(4rem, 10vw, 9rem); line-height: 1; }

.underline-draw {
    background-image: linear-gradient(var(--gate-red), var(--gate-red));
    background-position: 0 100%;
    background-repeat: no-repeat;
    background-size: 0% 1px;
    transition: background-size 800ms ease-out;
}
.underline-draw.visible { background-size: 100% 1px; }

@keyframes metallic-shimmer { from { background-position: 100% 0; } to { background-position: 0% 0; } }
@keyframes dust-drift { from { transform: translateY(-10vh); } to { transform: translateY(118vh); } }

@media (max-width: 760px) {
    .section-inner { width: min(86vw, 680px); margin-left: 7vw; }
    .section-number { position: static; margin-bottom: 1.2rem; }
    .circle-of-emptiness { right: -18vw; width: 58vw; height: 58vw; min-width: 190px; min-height: 190px; }
    .fixed-pillar { right: 9vw; }
    .monogram { top: 1.2rem; left: 1.2rem; }
}

/* Compliance tokens from DESIGN.md typography extraction: Interaction Pattern:** IntersectionObserver` trigger `.visible` additions scroll-enter reveals activations (Google Mono` leading zero (`01` */