@font-face {
  font-family: 'Hexaframe';
  src: url('../assets/fonts/Hexaframe.otf') format('opentype');
  font-display: swap;
}

@font-face {
  font-family: 'TechHud';
  src: url('../assets/fonts/tech.ttf') format('truetype');
  font-display: swap;
}

@font-face {
  font-family: 'Sprintura';
  src: url('../assets/fonts/sprintura.otf') format('opentype');
  font-display: swap;
}

@property --temp {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

@property --hud {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

@property --depth {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

@property --descend {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

.ab-root {
  --temp: 0;
  --hud: 0;
  --depth: 0;
  --descend: 0;

  --ink-warm: #f6efe3;
  --ink-cool: #d8e8fd;
  --ink: color-mix(in oklab, var(--ink-cool) calc(var(--temp) * 100%), var(--ink-warm));
  --ink-soft: color-mix(in oklab, var(--ink) 76%, transparent);
  --ink-faint: color-mix(in oklab, var(--ink) 42%, transparent);

  --instr: #b9d6f8;
  --instr-soft: rgba(185, 214, 248, 0.42);
  --instr-faint: rgba(185, 214, 248, 0.16);

  --void: #04070e;
  --deep: #060d1c;
  --plane: #0d1a2e;
  --plane-lit: #1b3358;
  --edge: rgba(206, 228, 255, 0.55);

  --glow-warm: 0 0 42px rgba(255, 238, 208, 0.16);
  --glow-cool: 0 0 42px rgba(160, 205, 255, 0.22);

  --font-mark: 'Cinzel', var(--font-serif);
  --font-hud: var(--font-mono);
  --font-voice: var(--font-body);
  --font-accent: 'Sprintura', 'Hexaframe', sans-serif;

  --grid-step: clamp(96px, calc(9 * var(--vw, 1vw)), 148px);
  --nav-w: 130px;
  --rail-w: 120px;
  --gutter: clamp(22px, calc(4 * var(--vw, 1vw)), 74px);

  transition: --temp 900ms var(--ease-decel);
}

.ab-root[data-temp='cool'] {
  --temp: 1;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.ab-root {
  margin: 0;
  min-height: calc(100 * var(--vh, 1vh));
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-voice);
  overflow-x: hidden;
}

body.ab-root[data-locked='true'] {
  overflow: hidden;
}

::selection {
  background: rgba(145, 206, 255, 0.32);
}

.ab-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.ab-column {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: calc(340 * var(--vh, 1vh));
  transform: translate3d(0, calc(var(--depth) * -240 * var(--vh, 1vh)), 0);
  will-change: transform;
}

.ab-panel-bg {
  position: absolute;
  left: 0;
  right: 0;
  height: calc(170 * var(--vh, 1vh));
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 13%, #000 87%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 13%, #000 87%, transparent 100%);
}

.ab-panel-bg[data-index='0'] { top: 0; height: calc(170 * var(--vh, 1vh)); }
.ab-panel-bg[data-index='1'] { top: calc(140 * var(--vh, 1vh)); height: calc(200 * var(--vh, 1vh)); }

.ab-panel-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  filter: saturate(0.7) contrast(1.02) brightness(0.76) blur(1px) hue-rotate(-5deg);
  transition: opacity 1600ms var(--ease-symmetric);
}

.ab-panel-bg video.is-ready {
  opacity: 1;
}

.ab-scrim {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(
    to right,
    rgba(3, 7, 16, 0.66) 0%,
    rgba(3, 7, 16, 0.42) 32%,
    rgba(3, 7, 16, 0.12) 60%,
    transparent 82%
  );
}

.ab-grid {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: calc(0.28 + var(--hud) * 0.34);
  background-image:
    repeating-linear-gradient(to right, rgba(255, 255, 255, 0.075) 0 1px, transparent 1px var(--grid-step)),
    repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px var(--grid-step));
  -webkit-mask-image: radial-gradient(128% 108% at 50% 44%, #000 26%, transparent 84%);
  mask-image: radial-gradient(128% 108% at 50% 44%, #000 26%, transparent 84%);
  transition: opacity 700ms var(--ease-standard);
}

.ab-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(255, 255, 255, 0.2) 0 1px, transparent 1px calc(var(--grid-step) * 4)),
    repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px calc(var(--grid-step) * 4));
  opacity: 0.7;
}



.ab-sigils {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.ab-sigil {
  grid-area: 1 / 1;
  width: min(calc(92 * var(--vh, 1vh)), calc(88 * var(--vw, 1vw)));
  height: min(calc(92 * var(--vh, 1vh)), calc(88 * var(--vw, 1vw)));
  object-fit: contain;
  mix-blend-mode: screen;
  opacity: 0;
  transform: scale(0.94) rotate(0deg);
  filter: brightness(0.8) saturate(0);
  transition: opacity 2200ms var(--ease-symmetric), transform 2600ms var(--ease-decel);
}

.ab-sigil.is-active {
  opacity: calc(0.10 + var(--hud) * 0.09);
  transform: scale(1) rotate(0deg);
  animation: ab-sigil-turn 220s linear infinite;
}

@keyframes ab-sigil-turn {
  from { rotate: 0deg; }
  to   { rotate: 360deg; }
}

.ab-reticle {
  position: fixed;
  top: 50%;
  left: 50%;
  width: min(calc(78 * var(--vh, 1vh)), calc(74 * var(--vw, 1vw)));
  margin: calc(min(calc(78 * var(--vh, 1vh)), calc(74 * var(--vw, 1vw))) / -2) 0 0 calc(min(calc(78 * var(--vh, 1vh)), calc(74 * var(--vw, 1vw))) / -2);
  z-index: 1;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: calc(var(--hud) * 0.16);
  animation: ab-sigil-turn 400s linear infinite reverse;
}

.ab-eyebrow,
.ab-chapter-tag,
.ab-chapter-index {
  font-family: var(--font-hud);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--instr);
  font-size: 10px;
}

.ab-chapter-title {
  font-family: var(--font-mark);
  font-weight: 500;
  font-size: clamp(1.8rem, calc(4.4 * var(--vw, 1vw)), 3.3rem);
  line-height: 1.14;
  letter-spacing: 0.035em;
  margin: 0;
  color: var(--ink);
  text-shadow: var(--glow-warm);
}

.ab-prose p,
.ab-lede p {
  font-family: var(--font-voice);
  font-size: clamp(0.98rem, calc(1.1 * var(--vw, 1vw)), 1.12rem);
  font-weight: 400;
  line-height: 1.95;
  letter-spacing: 0.012em;
  color: var(--ink-soft);
  margin: 0 0 1.5em;
  text-shadow: 0 1px 22px rgba(2, 5, 12, 0.92);
}

.ab-prose p:last-child,
.ab-lede p:last-child {
  margin-bottom: 0;
}

.ab-audio-toggle {
  position: fixed;
  right: clamp(18px, calc(3 * var(--vw, 1vw)), 38px);
  bottom: clamp(18px, calc(3 * var(--vw, 1vw)), 38px);
  z-index: var(--z-nav);
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: rgba(6, 13, 28, 0.5);
  border: 1px solid var(--instr-faint);
  border-radius: 2px;
  backdrop-filter: var(--blur-sm);
  cursor: pointer;
  transition: border-color var(--dur-base) var(--ease-standard);
  animation: ab-rise 1400ms 1600ms var(--ease-decel) both;
}

.ab-audio-toggle:hover {
  border-color: var(--edge);
}

.ab-audio-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
}

.ab-audio-bars i {
  width: 2px;
  background: var(--instr);
  animation: ab-bars 1.1s ease-in-out infinite;
}

.ab-audio-bars i:nth-child(1) { height: 40%; animation-delay: 0s; }
.ab-audio-bars i:nth-child(2) { height: 90%; animation-delay: 0.18s; }
.ab-audio-bars i:nth-child(3) { height: 60%; animation-delay: 0.36s; }
.ab-audio-bars i:nth-child(4) { height: 30%; animation-delay: 0.54s; }

@keyframes ab-bars {
  0%, 100% { transform: scaleY(0.4); }
  50%      { transform: scaleY(1); }
}

.ab-audio-toggle[aria-pressed='false'] .ab-audio-bars i {
  animation: none;
  height: 22%;
  opacity: 0.45;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .ab-sigil.is-active,
  .ab-reticle,
  .ab-audio-bars i {
    animation: none;
  }

  .ab-column {
    display: none;
  }
}

@media (max-width: 860px) {
  .ab-reticle {
    width: calc(120 * var(--vw, 1vw));
    margin: calc(-60 * var(--vw, 1vw)) 0 0 calc(-60 * var(--vw, 1vw));
  }
}