:root {
  --bg: #03050d;
  --ink: #eef1fb;
  --text: #dfe4f3;
  --muted: #a7b0c9;
  --gold: #f2c66d;
  --warm: #ffb85c;
  --line: rgba(255, 255, 255, 0.12);
  --serif: "Cormorant Garamond", "Noto Serif", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mongol: "Noto Sans Mongolian", "Mongolian Baiti", serif;
  --gutter: clamp(16px, 7vw, 120px);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  color-scheme: dark;
}

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

html {
  background: var(--bg);
}

html.lenis,
html.lenis body {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

.lenis.lenis-stopped {
  overflow: hidden;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  font: 400 1rem/1.7 var(--sans);
  background: radial-gradient(120% 80% at 50% 25%, #0c1836 0%, #050817 55%, var(--bg) 100%) fixed;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: rgba(242, 198, 109, 0.5);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--gold);
}

/* ---------- fixed layers ---------- */

#scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100vw;
  height: 100vh;
}

.no-webgl #scene {
  display: none;
}

.veil {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(0, 0, 0, 0.6) 100%);
}

.grain {
  position: fixed;
  inset: -50%;
  z-index: 1;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
  animation: grain 1.2s steps(6) infinite;
}

@keyframes grain {
  0% { transform: translate(0, 0); }
  20% { transform: translate(-3%, 2%); }
  40% { transform: translate(2%, -4%); }
  60% { transform: translate(-4%, -1%); }
  80% { transform: translate(3%, 3%); }
  100% { transform: translate(0, 0); }
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 4;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), #fff3cf);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.loader {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 16px;
  text-align: center;
  background: radial-gradient(60% 50% at 50% 50%, #0b1430 0%, var(--bg) 100%);
  transition: opacity 1.2s ease, visibility 1.2s;
}

.loader__mark {
  color: var(--gold);
  font: 400 2.4rem/1 var(--mongol);
  writing-mode: vertical-lr;
  text-shadow: 0 0 24px rgba(242, 198, 109, 0.6);
  animation: breathe 2.4s ease-in-out infinite;
}

.loader__text {
  color: var(--muted);
  font: italic 500 1.25rem/1.4 var(--serif);
  letter-spacing: 0.06em;
}

.loader__bar {
  position: relative;
  width: 140px;
  height: 1px;
  overflow: hidden;
  background: var(--line);
}

.loader__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  animation: sweep 1.4s ease-in-out infinite;
}

@keyframes breathe {
  50% { opacity: 0.45; }
}

@keyframes sweep {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

.is-ready .loader {
  opacity: 0;
  visibility: hidden;
}

/* ---------- chapter navigation ---------- */

.chapters {
  position: fixed;
  top: 50%;
  right: clamp(8px, 2vw, 28px);
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-50%);
}

.chapters button {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 4px 0;
  border: 0;
  background: none;
  color: var(--muted);
  font: 500 0.74rem/1 var(--sans);
  letter-spacing: 0.04em;
  cursor: pointer;
}

.chapters .dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: transform 0.3s, background 0.3s, box-shadow 0.3s;
}

.chapters .label {
  white-space: nowrap;
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.3s, transform 0.3s;
}

.chapters button:hover .label,
.chapters button:focus-visible .label {
  opacity: 1;
  transform: none;
}

.chapters button.active {
  color: var(--ink);
}

.chapters button.active .dot {
  background: var(--gold);
  box-shadow: 0 0 12px var(--gold);
  transform: scale(1.6);
}

.chapters button:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 4px;
  border-radius: 4px;
}

/* ---------- chapters ---------- */

main {
  position: relative;
  z-index: 2;
}

.chapter {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 190vh;
  padding: 0 var(--gutter);
}

.chapter[data-side="right"] {
  align-items: flex-end;
}

.chapter[data-side="center"] {
  align-items: center;
}

/* Text floats over the sky: no panel, only a soft shadow behind it. */
.card {
  position: sticky;
  top: 50vh;
  width: min(420px, 100%);
  transform: translateY(-50%);
}

.chapter[data-side="right"] .card {
  text-align: right;
}

.card::before {
  content: "";
  position: absolute;
  inset: -70px -90px;
  z-index: -1;
  background: radial-gradient(closest-side, rgba(3, 5, 13, 0.62), rgba(3, 5, 13, 0));
  pointer-events: none;
}

/* large faint chapter numeral */
.card[data-num]::after {
  content: attr(data-num);
  position: absolute;
  top: -0.42em;
  left: -0.06em;
  z-index: -1;
  color: var(--gold);
  font: 600 9rem/1 var(--serif);
  opacity: 0.06;
  pointer-events: none;
}

.chapter[data-side="right"] .card[data-num]::after {
  left: auto;
  right: -0.06em;
}

/* staggered entrance of each line */
.js .card > * {
  opacity: 0;
  filter: blur(8px);
  transform: translateY(18px);
  transition: opacity 0.9s var(--ease), transform 1.1s var(--ease), filter 0.9s var(--ease);
}

.js .card.is-in > * {
  opacity: 1;
  filter: none;
  transform: none;
}

.card.is-in > :nth-child(2) {
  transition-delay: 0.08s;
}

.card.is-in > :nth-child(3) {
  transition-delay: 0.18s;
}

.card.is-in > :nth-child(4) {
  transition-delay: 0.28s;
}

.chapter--last {
  min-height: 160vh;
}

/* hero */

.hero {
  min-height: 150vh;
}

.hero .card {
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 980px;
  height: 100vh;
  text-align: center;
  transform: translateY(var(--shift, 0px));
}

.hero .card::before {
  inset: 18% 4%;
}

.js .hero .card > * {
  filter: none;
  transform: none;
  transition: none;
}

.is-ready .hero .kicker,
.is-ready .hero h1,
.is-ready .hero .lead,
.is-ready .hero .scroll-hint {
  animation: rise 1.6s var(--ease) both;
}

.is-ready .hero h1 {
  animation-name: unveil;
  animation-duration: 2.2s;
  animation-delay: 0.3s;
}

.is-ready .hero .lead {
  animation-delay: 1s;
}

.is-ready .hero .scroll-hint {
  animation-delay: 1.5s;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes unveil {
  from {
    opacity: 0;
    filter: blur(14px);
    letter-spacing: 0.12em;
  }
  to {
    opacity: 1;
    filter: blur(0) drop-shadow(0 0 28px rgba(140, 170, 255, 0.35));
    letter-spacing: -0.01em;
  }
}

.mongol {
  position: absolute;
  color: var(--gold);
  font: 400 1.5rem/1 var(--mongol);
  letter-spacing: 0.05em;
  writing-mode: vertical-lr;
  opacity: 0.6;
}

.hero .mongol {
  top: 50vh;
  left: var(--gutter);
  transform: translateY(-50%);
}

@media (max-width: 1099px) {
  .hero .mongol {
    display: none;
  }
}

/* ---------- type ---------- */

.kicker {
  margin: 0 0 12px;
  color: var(--gold);
  font: 500 0.74rem/1.4 var(--sans);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.9);
}

h1 {
  margin: 0 0 22px;
  font: 600 clamp(2.8rem, 7.5vw, 6.4rem)/1.02 var(--serif);
  letter-spacing: -0.01em;
  text-wrap: balance;
  background: linear-gradient(180deg, #ffffff 30%, #e9d3a1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 28px rgba(140, 170, 255, 0.35));
}

h2 {
  margin: 0 0 14px;
  font: 600 clamp(2.6rem, 5vw, 4.2rem)/1 var(--serif);
  letter-spacing: -0.005em;
  text-wrap: balance;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.85);
}

.card p {
  margin: 0;
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1.6;
  text-shadow: 0 1px 16px rgba(0, 0, 0, 0.95);
}

.card .kicker {
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 0.74rem;
}

.hero .lead {
  max-width: 640px;
  color: var(--muted);
  font: italic 500 1.5rem/1.4 var(--serif);
  letter-spacing: 0.02em;
}

.card .scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 40px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.scroll-hint::after {
  content: "";
  width: 1px;
  height: 46px;
  background: linear-gradient(var(--gold), transparent);
  transform-origin: top;
  animation: drip 2.4s ease-in-out infinite;
}

@keyframes drip {
  0% {
    transform: scaleY(0);
    opacity: 1;
  }
  60% {
    transform: scaleY(1);
    opacity: 1;
  }
  100% {
    transform: scaleY(1);
    opacity: 0;
  }
}

.cta {
  margin-top: 26px;
  padding: 12px 22px;
  border: 1px solid rgba(242, 198, 109, 0.5);
  border-radius: 999px;
  background: rgba(242, 198, 109, 0.1);
  color: #fff1cf;
  font: 500 0.88rem/1.2 var(--sans);
  letter-spacing: 0.02em;
  cursor: not-allowed;
}

/* ---------- footer ---------- */

.colophon {
  position: relative;
  z-index: 2;
  max-width: 780px;
  padding: 6vh var(--gutter) 12vh;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.colophon p {
  margin: 0 0 8px;
}

.colophon .credits {
  margin-top: 16px;
  opacity: 0.8;
}

.colophon .mongol {
  position: static;
  display: block;
  margin-bottom: 18px;
  font-size: 2rem;
}

/* ---------- small screens ---------- */

@media (max-width: 759px) {
  .chapter,
  .chapter[data-side] {
    align-items: stretch;
    min-height: 200vh;
  }

  .card,
  .chapter[data-side="right"] .card {
    top: max(9vh, calc(100vh - var(--h, 40vh) - 6vh));
    width: 100%;
    text-align: left;
    transform: none;
  }

  .hero .card {
    top: 0;
    text-align: center;
  }

  .card[data-num]::after,
  .chapter[data-side="right"] .card[data-num]::after {
    left: -0.04em;
    right: auto;
    font-size: 6.5rem;
  }

  h2 {
    font-size: 2.6rem;
  }

  .card p {
    font-size: 1rem;
  }

  .hero .lead {
    font-size: 1.25rem;
  }

  .chapters {
    right: 4px;
    gap: 0;
  }

  .chapters .label {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-hint::after,
  .grain,
  .loader__mark,
  .loader__bar::after {
    animation: none;
  }

  .js .card > * {
    filter: none;
    transform: none;
    transition: opacity 0.3s linear;
  }

  .is-ready .hero .kicker,
  .is-ready .hero h1,
  .is-ready .hero .lead,
  .is-ready .hero .scroll-hint {
    animation-duration: 0.01s;
    animation-delay: 0s;
  }
}