/* ==========================================================================
   Tokens
   ========================================================================== */

:root {
  /* Palette: ink, bone, one violet accent, plus a warm ash neutral */
  --ink: #0b0b0a;
  --bone: #ece8e0;
  --violet: #8c6cff;
  --ash: #7a766f;
  --rule: rgba(236, 232, 224, 0.14);
  --mark: rgba(236, 232, 224, 0.4);

  /* Type families */
  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Type scale: perfect fourth (1.333), plus one fluid display size */
  --fs-0: 0.75rem;     /* 12px — mono labels, metadata */
  --fs-1: 1rem;        /* 16px — body */
  --fs-2: 1.333rem;    /* 21px */
  --fs-3: 1.777rem;    /* 28px */
  --fs-4: 2.369rem;    /* 38px — index entries */
  --fs-5: 3.157rem;    /* 51px */
  --fs-6: 4.209rem;    /* 67px — title lead-in */
  --fs-display: clamp(5.5rem, 21vw, 15rem);

  /* Spacing & motion */
  --gutter: clamp(1rem, 3vw, 2.5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
  --dur: 0.45s;

  /* Monochrome film grain */
  --grain: 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='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html {
  background: var(--ink);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: clamp(2.5rem, 6vh, 4.5rem);
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--gutter);
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
  background: var(--ink);
  color: var(--bone);
  font-family: var(--sans);
  font-size: var(--fs-1);
  line-height: 1.5;
  font-kerning: normal;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--violet);
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible {
  outline: 1px solid var(--violet);
  outline-offset: 6px;
}

/* Film grain over everything, never blocking clicks */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 10;
  background-image: var(--grain);
  opacity: 0.07;
  pointer-events: none;
}

/* ==========================================================================
   Viewfinder crop marks
   ========================================================================== */

.frame {
  --len: 14px;
  position: fixed;
  inset: calc(var(--gutter) / 2);
  pointer-events: none;
  background:
    linear-gradient(var(--mark), var(--mark)) top left / var(--len) 1px,
    linear-gradient(var(--mark), var(--mark)) top left / 1px var(--len),
    linear-gradient(var(--mark), var(--mark)) top right / var(--len) 1px,
    linear-gradient(var(--mark), var(--mark)) top right / 1px var(--len),
    linear-gradient(var(--mark), var(--mark)) bottom left / var(--len) 1px,
    linear-gradient(var(--mark), var(--mark)) bottom left / 1px var(--len),
    linear-gradient(var(--mark), var(--mark)) bottom right / var(--len) 1px,
    linear-gradient(var(--mark), var(--mark)) bottom right / 1px var(--len);
  background-repeat: no-repeat;
}

/* ==========================================================================
   Top & bottom bars (mono metadata, like a viewer overlay)
   ========================================================================== */

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: var(--fs-0);
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ash);
  font-variant-numeric: tabular-nums;
}

.bar b {
  font-weight: 400;
  color: var(--bone);
}

.bar__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--bone);
}

.swatch {
  width: 7px;
  height: 7px;
  background: var(--violet);
}

.bar__meta {
  display: inline-flex;
  gap: 1.5rem;
}

.timeline {
  --progress: 0;
  position: relative;
  flex: 1;
  max-width: 28rem;
  height: 9px;
  /* 60 minor ticks (one per second) and major ticks every 10 seconds */
  background:
    repeating-linear-gradient(to right, var(--ash) 0 1px, transparent 1px calc(100% / 6)) bottom / 100% 9px,
    repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px calc(100% / 60)) bottom / 100% 4px;
  background-repeat: no-repeat;
  border-right: 1px solid var(--ash);
}

.timeline__playhead {
  position: absolute;
  top: -3px;
  bottom: 0;
  left: calc(var(--progress) * 100%);
  width: 1px;
  background: var(--violet);
}

.timeline__playhead::before {
  content: "";
  position: absolute;
  top: 0;
  left: -3px;
  border: 3.5px solid transparent;
  border-top: 4px solid var(--violet);
  border-bottom: 0;
}

/* ==========================================================================
   Stage: index top-right, title bottom-left, lede bottom-right
   ========================================================================== */

.stage {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: auto 1fr;
  column-gap: var(--gutter);
  row-gap: 3rem;
}

.index {
  grid-column: 8 / -1;
  grid-row: 1;
}

.title {
  grid-column: 1 / 8;
  grid-row: 2;
  align-self: end;
}

.lede {
  grid-column: 9 / -1;
  grid-row: 2;
  align-self: end;
  /* Sit on the title's baseline rather than the bottom of its line box */
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   Title
   ========================================================================== */

.title {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--bone);
}

.title__pre {
  display: block;
  font-size: clamp(var(--fs-4), 6vw, var(--fs-6));
  line-height: 1;
  letter-spacing: -0.01em;
  /* Optical alignment: pull the V's overhang back to the grid line */
  margin-left: -0.04em;
}

.title__pre em {
  font-style: italic;
  color: var(--violet);
}

.title__main {
  display: block;
  font-size: var(--fs-display);
  line-height: 0.8;
  letter-spacing: -0.035em;
  /* Optical alignment: the B's left sidebearing sits inside the grid line */
  margin-left: -0.06em;
}

/* ==========================================================================
   Lede
   ========================================================================== */

.lede {
  font-size: var(--fs-2);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--bone);
  text-wrap: balance;
}

.lede__label {
  display: block;
  margin-bottom: 0.9rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: var(--fs-0);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ash);
}

/* ==========================================================================
   Index (social links)
   ========================================================================== */

.index__head {
  display: flex;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: var(--fs-0);
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ash);
}

.index__list {
  list-style: none;
}

.index__list a {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem 1.25rem 1fr auto 1rem;
  align-items: baseline;
  column-gap: 1rem;
  padding: 1.15rem 0 1rem;
  border-bottom: 1px solid var(--rule);
}

/* Violet rule that draws in from the left on hover and retracts to the right */
.index__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--violet);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.6s var(--ease);
}

.index__num,
.index__handle {
  font-family: var(--mono);
  font-size: var(--fs-0);
  letter-spacing: 0.04em;
  color: var(--ash);
  font-variant-numeric: tabular-nums;
  transition: color var(--dur) var(--ease);
}

.index__name {
  font-family: var(--serif);
  font-size: clamp(var(--fs-3), 3vw, var(--fs-4));
  line-height: 1;
  letter-spacing: -0.01em;
  transition:
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.index__icon {
  align-self: center;
  width: 1.25rem;
  height: 1.25rem;
  color: var(--ash);
  transition:
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.index__arrow {
  align-self: center;
  width: 1rem;
  height: 1rem;
  color: var(--ash);
  transition:
    color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

@media (hover: hover) {
  .index__list a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
  }

  .index__list a:hover .index__num {
    color: var(--violet);
  }

  .index__list a:hover .index__handle {
    color: var(--bone);
  }

  .index__list a:hover .index__icon {
    color: var(--bone);
    transform: translateY(-2px);
  }

  .index__list a:hover .index__name {
    transform: translateY(-2px);
  }

  .index__list a:hover .index__arrow {
    color: var(--violet);
    transform: translate(2px, -2px);
  }
}

.index__list a:focus-visible {
  outline-offset: 4px;
}

.index__list a:focus-visible::after {
  transform: scaleX(1);
}

.index__list a:active .index__name {
  color: var(--violet);
}

/* ==========================================================================
   Load-in
   ========================================================================== */

.title__pre,
.title__main,
.lede,
.index__head,
.index__list li {
  animation: enter 1s var(--ease) both;
}

.index__head { animation-delay: 0.1s; }
.index__list li:nth-child(1) { animation-delay: 0.16s; }
.index__list li:nth-child(2) { animation-delay: 0.22s; }
.index__list li:nth-child(3) { animation-delay: 0.28s; }
.title__pre { animation-delay: 0.3s; }
.title__main { animation-delay: 0.38s; }
.lede { animation-delay: 0.5s; }

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(0.35rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   Small screens: stack title, lede, then index
   ========================================================================== */

@media (max-width: 860px) {
  .stage {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 2.5rem;
  }

  .title,
  .lede {
    align-self: stretch;
  }

  .title { order: 1; }
  .lede { order: 2; margin-bottom: 0; }
  .index { order: 3; }

  :root {
    --fs-display: clamp(5.5rem, 34vw, 13rem);
  }
}

@media (max-width: 480px) {
  .bar__fps {
    display: none;
  }

  .index__list a {
    grid-template-columns: 2rem 1.25rem 1fr auto;
  }

  .index__handle {
    display: none;
  }
}

/* Reduced motion: skip the entrance and anything that moves, but keep the
   color fades so hovers still ease in rather than snapping */
@media (prefers-reduced-motion: reduce) {
  .title__pre,
  .title__main,
  .lede,
  .index__head,
  .index__list li {
    animation: none;
  }

  .index__list a:hover .index__icon,
  .index__list a:hover .index__name,
  .index__list a:hover .index__arrow {
    transform: none;
  }

  /* The violet rule fades in place instead of drawing across */
  .index__list a::after {
    transform: none;
    opacity: 0;
    transition: opacity var(--dur) var(--ease);
  }

  .index__list a:hover::after,
  .index__list a:focus-visible::after {
    transform: none;
    opacity: 1;
  }
}