/* ---------- шрифт (локально) ---------- */
@font-face {
  font-family: "JB Mono";
  font-weight: 400;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2199, U+2212, U+2215;
}
@font-face {
  font-family: "JB Mono";
  font-weight: 400;
  font-display: swap;
  src: url("fonts/jetbrains-mono-cyrillic-400-normal.woff2") format("woff2");
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "JB Mono";
  font-weight: 700;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin-700-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2199, U+2212, U+2215;
}
@font-face {
  font-family: "JB Mono";
  font-weight: 700;
  font-display: swap;
  src: url("fonts/jetbrains-mono-cyrillic-700-normal.woff2") format("woff2");
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

/* ---------- токены ---------- */
:root {
  --bg: #ffffff;
  --ink: #1c1c1c;
  --muted: #8a8a8a;
  --faint: #c9c9c9;
  --accent: #c8391e;
  --mono: "JB Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --vh: 1vh;
  --frame-w: min(420px, 32vw);        /* макс. ширина кадра */
  --frame-h: calc(var(--vh) * 44);    /* макс. высота кадра */
  --gap: 40px;                        /* отступ между кадрами */
  --cap-w: min(300px, calc((100vw - var(--frame-w)) / 2 - 110px));
  --ease: cubic-bezier(.22, .61, .36, 1);
}
@supports (height: 1svh) {
  :root { --vh: 1svh; }
}

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

html {
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  text-transform: uppercase;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

h1, h2, p { margin: 0; font-weight: 400; }

/* ---------- шапка ---------- */
.top {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: max(18px, env(safe-area-inset-top)) clamp(16px, 8.5vw, 140px) 18px;
  background: linear-gradient(var(--bg) 55%, rgba(255, 255, 255, 0));
  pointer-events: none;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .02em;
  line-height: 1;
}
.counter {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: pre;
}

/* ---------- линейки по краям ---------- */
.ruler {
  position: fixed;
  top: 50%;
  z-index: 15;
  width: 30px;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 5px;
  pointer-events: none;
}
.ruler--left  { left: 24px;  align-items: flex-start; }
.ruler--right { right: 24px; align-items: flex-end; }
.ruler::before {           /* красная риска сверху, как на референсе */
  content: "";
  width: 30px;
  height: 1px;
  margin-bottom: 4px;
  background: var(--accent);
}
.ruler i {
  display: block;
  width: 14px;
  height: 1px;
  background: var(--faint);
  transition: width .4s var(--ease), background-color .4s var(--ease);
}
.ruler i.is-on {
  width: 24px;
  background: var(--accent);
}

/* ---------- первый экран ---------- */
.intro, .final {
  min-height: calc(var(--vh) * 100);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 90px 24px;
}
.intro__kicker { color: var(--muted); margin-bottom: 22px; }
.intro__title {
  font-weight: 700;
  font-size: clamp(34px, 7vw, 76px);
  line-height: 1.02;
  letter-spacing: -.01em;
  white-space: pre-line;
}
.intro__hint {
  margin-top: 40px;
  color: var(--muted);
}
.intro__hint::after {
  content: "";
  display: block;
  width: 1px;
  height: 46px;
  margin: 14px auto 0;
  background: var(--accent);
  transform-origin: top;
  animation: drip 2.2s var(--ease) infinite;
}
@keyframes drip {
  0%   { transform: scaleY(0); opacity: 1; }
  60%  { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(1); opacity: 0; }
}

/* ---------- лента ---------- */
#track {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.group-mark {
  height: calc(var(--vh) * 26);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: pre;
}
.group-mark::before,
.group-mark::after {
  content: "";
  width: 1px;
  height: 28px;
  background: var(--faint);
}
.group-mark b { font-weight: 400; color: var(--accent); }

.slide {
  position: relative;
  width: var(--frame-w);
  margin: calc(var(--gap) / 2) 0;
  scroll-snap-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.frame {
  position: relative;
  width: min(var(--frame-w), calc(var(--frame-h) * var(--ar)));
  aspect-ratio: var(--ar);
}

.photo {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #f1efec;
  opacity: .2;
  filter: saturate(.5) contrast(.85);
  transition: opacity .7s var(--ease), filter .7s var(--ease);
  will-change: opacity;
}
.photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
/* зерно: SVG-шум поверх фото, в картинки не запекается */
.photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' 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");
  background-size: 220px 220px;
  mix-blend-mode: overlay;
  opacity: .55;
  pointer-events: none;
}
/* выцветание к белому у соседей: сверху — вверх, снизу — вниз */
.photo::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity .7s var(--ease);
}
.slide.is-above .photo::before {
  opacity: 1;
  background: linear-gradient(to top, rgba(255, 255, 255, 0) 30%, rgba(255, 255, 255, .85));
}
.slide.is-below .photo::before {
  opacity: 1;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 30%, rgba(255, 255, 255, .85));
}
.slide.is-active .photo {
  opacity: 1;
  filter: none;
}

/* красные уголки */
.corners {
  position: absolute;
  inset: -7px;
  pointer-events: none;
  opacity: 0;
  transform: scale(1.03);
  transition: opacity .5s var(--ease), transform .6s var(--ease);
}
.corners span {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 0 solid var(--accent);
}
.corners span:nth-child(1) { top: 0;    left: 0;  border-top-width: 1px;    border-left-width: 1px; }
.corners span:nth-child(2) { top: 0;    right: 0; border-top-width: 1px;    border-right-width: 1px; }
.corners span:nth-child(3) { bottom: 0; left: 0;  border-bottom-width: 1px; border-left-width: 1px; }
.corners span:nth-child(4) { bottom: 0; right: 0; border-bottom-width: 1px; border-right-width: 1px; }
.slide.is-active .corners { opacity: 1; transform: none; }

/* текст-поздравление: справа от кадра на десктопе */
.caption {
  position: absolute;
  top: 50%;
  left: calc(100% + 110px);
  width: var(--cap-w);
  transform: translateY(-50%);
  text-align: justify;
  text-align-last: left;
  white-space: pre-line;
  opacity: 0;
  transition: opacity .5s var(--ease), transform .6s var(--ease);
}
.caption__num {
  display: block;
  margin-bottom: 10px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.slide.is-active .caption {
  opacity: 1;
  transition-delay: .12s;
}

/* ---------- финал ---------- */
.final { padding-bottom: 120px; }
.final__title {
  font-weight: 700;
  font-size: clamp(40px, 9vw, 112px);
  line-height: 1;
  letter-spacing: -.02em;
  white-space: pre-line;
  position: relative;
  padding: 26px 30px;
}
.final__title::before,
.final__title::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 0 solid var(--accent);
}
.final__title::before { top: 0; left: 0; border-top-width: 1px; border-left-width: 1px; }
.final__title::after  { bottom: 0; right: 0; border-bottom-width: 1px; border-right-width: 1px; }
.final__lines {
  margin-top: 40px;
  max-width: 460px;
  display: grid;
  gap: 6px;
}
.final__sign {
  margin-top: 28px;
  color: var(--accent);
}

/* ---------- кассета-плеер ---------- */
.cassette {
  position: fixed;
  right: max(28px, env(safe-area-inset-right));
  bottom: max(24px, env(safe-area-inset-bottom));
  z-index: 30;
  width: 84px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  color: var(--ink);
  font: inherit;
  touch-action: manipulation;
}
.cassette[hidden] { display: none; }
.cassette svg { display: block; width: 100%; height: auto; filter: drop-shadow(0 3px 8px rgba(0, 0, 0, .18)); }
.cassette .c-body   { fill: #262320; }
.cassette .c-label  { fill: #e8dfcc; }
.cassette .c-stripe { fill: var(--accent); }
.cassette .c-window { fill: #3a342d; }
.cassette .c-reel circle { fill: #e8dfcc; }
.cassette .c-reel path { stroke: #3a342d; stroke-width: 2; }
.cassette .c-bottom { fill: #1a1816; }
.cassette .c-hole   { fill: #000; }
.cassette .c-reel { transform-box: fill-box; transform-origin: center; }
.cassette.is-playing .c-reel { animation: spin 2.4s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.cassette__label {
  display: block;
  margin-top: 6px;
  font-size: 10px;
  text-align: right;
  color: var(--muted);
}
.cassette.is-playing .cassette__label { color: var(--accent); }
.cassette:focus-visible { outline: 1px solid var(--accent); outline-offset: 6px; }

/* ---------- мобильная версия: одна колонка ---------- */
@media (max-width: 900px) {
  :root {
    --frame-w: calc(100vw - 72px);
    --frame-h: calc(var(--vh) * 52);
    --gap: 28px;
  }
  body { font-size: 11px; }
  .top { padding-left: 20px; padding-right: 20px; }
  .brand { font-size: 16px; }
  .counter { font-size: 11px; }

  .ruler { width: 14px; gap: 4px; }
  .ruler--left  { left: 8px; }
  .ruler--right { right: 8px; }
  .ruler::before { width: 14px; }
  .ruler i { width: 7px; }
  .ruler i.is-on { width: 14px; }

  .corners { inset: -6px; }
  .corners span { width: 11px; height: 11px; }

  /* текст под активным фото */
  .caption {
    position: static;
    width: 100%;
    margin-top: 20px;
    transform: translateY(6px);
    text-align: left;
  }
  .slide.is-active .caption { transform: none; }

  .group-mark { height: calc(var(--vh) * 18); }
  .intro, .final { padding-left: 40px; padding-right: 40px; }

  .cassette { width: 64px; right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); }
  .cassette__label { font-size: 9px; margin-top: 4px; }
}

/* ---------- меньше анимаций ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation: none !important;
  }
  .corners, .caption { transform: none !important; }
}