/* ============================================================
   ВЫЖИВИ — стили
   Цвета и шрифты меняются в :root
   ============================================================ */

:root {
  --bg: #0a0b0c;
  --ink: #e8e3d6;
  --ink-dim: #a39d90;
  --ink-mute: #736e64;
  --amber: #f0a92e;
  --amber-deep: #d9741c;
  --signal: #f5c518;
  --panel: rgba(13, 14, 15, .78);
  --line: rgba(232, 227, 214, .10);

  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --wear: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='2' seed='7'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -16 12'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--ink);
  background: var(--bg);
  font: 16px/1.45 var(--sans);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Фон ---------- */

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

.sky, .grain, .vignette { position: absolute; inset: 0; }

.sky {
  background:
    radial-gradient(120% 55% at 50% 80%, rgba(196, 98, 32, .26), transparent 62%),
    radial-gradient(60% 35% at 72% 72%, rgba(240, 169, 46, .08), transparent 70%),
    linear-gradient(#0a0b0c 0%, #111214 40%, #1a1714 74%, #0a0a0a 100%);
}

.city {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 56%;
  object-fit: cover;
  object-position: 50% 100%;
}

.fog {
  position: absolute;
  left: -50%;
  width: 200%;
  height: 45%;
  background:
    radial-gradient(30% 50% at 18% 60%, rgba(170, 160, 145, .15), transparent 70%),
    radial-gradient(24% 42% at 46% 48%, rgba(170, 160, 145, .11), transparent 70%),
    radial-gradient(34% 55% at 78% 62%, rgba(170, 160, 145, .14), transparent 70%);
  will-change: transform;
}
.fog--far  { bottom: 26%; opacity: .7; animation: drift 70s linear infinite alternate; }
.fog--near { bottom: -8%; opacity: .9; animation: drift 46s linear infinite alternate-reverse; }

@keyframes drift {
  from { transform: translate3d(-8%, 0, 0); }
  to   { transform: translate3d(22%, 0, 0); }
}

.grain {
  background-image: var(--noise);
  background-size: 180px;
  opacity: .07;
}

.vignette {
  background:
    linear-gradient(rgba(10, 11, 12, .65), transparent 30%),
    radial-gradient(130% 90% at 50% 45%, transparent 45%, rgba(0, 0, 0, .8) 100%);
}

/* ---------- Раскладка ---------- */

.page {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(14px, 2.8vh, 28px);
  width: 100%;
  max-width: 460px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding:
    calc(env(safe-area-inset-top) + 28px)
    calc(env(safe-area-inset-right) + 20px)
    calc(env(safe-area-inset-bottom) + 28px)
    calc(env(safe-area-inset-left) + 20px);
}

/* ---------- Заголовок ---------- */

.hero { text-align: center; }

.signal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  font: 11px/1 var(--mono);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.signal__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
  animation: blink 2.2s steps(1) infinite;
}
@keyframes blink { 50% { opacity: .2; } }

.title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(54px, 17.5vw, 96px);
  line-height: .92;
  letter-spacing: .02em;
  text-indent: .02em;
  color: var(--ink);
  background: linear-gradient(180deg, #f4efe3 0%, #d3cbb9 52%, #8a8172 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  -webkit-mask-image: var(--wear);
  mask-image: var(--wear);
  -webkit-mask-size: 240px;
  mask-size: 240px;
}

.hazard {
  width: 92px;
  height: 6px;
  margin: 14px auto 12px;
  background: repeating-linear-gradient(-45deg, var(--signal) 0 7px, #121212 7px 14px);
  opacity: .85;
}

.tagline {
  margin: 0;
  font: 15px/1.4 var(--mono);
  letter-spacing: .02em;
  color: var(--ink-dim);
}
.tagline::after {
  content: "▍";
  margin-left: 2px;
  color: var(--amber);
  animation: blink 1.1s steps(1) infinite;
}

/* ---------- Инструкция ---------- */

.guide {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: border-color .3s, box-shadow .3s;
}
.guide::before,
.guide::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid var(--amber);
  opacity: .7;
  pointer-events: none;
}
.guide::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.guide::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.guide__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 56px;
  padding: 12px 16px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}
.guide__head::-webkit-details-marker { display: none; }
.guide__head:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

.guide__meta { display: grid; gap: 4px; }

.guide__label {
  font: 10px/1 var(--mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
  opacity: .75;
}

.guide__badge {
  display: none;
  justify-self: start;
  padding: 3px 6px;
  font: 700 10px/1 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #111;
  background: var(--signal);
  border-radius: 2px;
}

.guide__title {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: .12em;
}

.guide__chev {
  flex: none;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  border-right: 2px solid var(--ink-dim);
  border-bottom: 2px solid var(--ink-dim);
  transform: translateY(-3px) rotate(45deg);
  transition: transform .25s;
}
.guide[open] .guide__chev { transform: translateY(2px) rotate(-135deg); }

.guide__body { padding: 0 16px 16px; }

.steps {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.steps li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  font-size: 15px;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--line);
  border-radius: 3px;
}
.steps__n {
  flex: none;
  padding: 3px 6px;
  font: 12px/1 var(--mono);
  color: var(--signal);
  border: 1px solid rgba(245, 197, 24, .4);
  border-radius: 2px;
}
.kbd {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  height: 26px;
  margin: 0 2px;
  padding: 0 6px;
  vertical-align: middle;
  font-weight: 900;
  line-height: 1;
  background: rgba(255, 255, 255, .07);
  border: 1px solid var(--ink-mute);
  border-radius: 6px;
}

.hint {
  margin: 12px 0 0;
  padding-left: 10px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink-mute);
  border-left: 2px solid rgba(240, 169, 46, .35);
}

.copy {
  display: block;
  width: 100%;
  min-height: 44px;
  margin-top: 12px;
  padding: 10px 12px;
  font: 12px/1.3 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  background: transparent;
  border: 1px dashed rgba(232, 227, 214, .2);
  border-radius: 3px;
  cursor: pointer;
  word-break: break-all;
}
.copy:active { background: rgba(255, 255, 255, .04); }
.copy.is-done { color: var(--signal); border-color: rgba(245, 197, 24, .5); }
.copy:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* Режим TikTok: инструкция раскрыта и выделена */
.is-tiktok .guide {
  border-color: rgba(245, 197, 24, .45);
  box-shadow: 0 0 0 1px rgba(245, 197, 24, .12), 0 0 44px -12px rgba(245, 197, 24, .4);
}
.is-tiktok .guide__label { display: none; }
.is-tiktok .guide__badge { display: inline-block; }

.menu-hint {
  display: none;
  position: fixed;
  z-index: 2;
  top: calc(env(safe-area-inset-top) + 10px);
  right: calc(env(safe-area-inset-right) + 12px);
  padding: 6px 10px;
  font: 11px/1.2 var(--mono);
  letter-spacing: .06em;
  color: var(--signal);
  background: rgba(10, 11, 12, .88);
  border: 1px solid rgba(245, 197, 24, .4);
  border-radius: 3px;
  animation: bob 2.4s ease-in-out infinite;
}
.is-tiktok .menu-hint { display: block; }
@keyframes bob { 50% { transform: translateY(-4px); } }

/* ---------- Кнопка ---------- */

.btn {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  min-height: 68px;
  padding: 16px 20px;
  font-weight: 900;
  font-size: clamp(15px, 4.4vw, 18px);
  line-height: 1.15;
  letter-spacing: .06em;
  text-align: center;
  text-decoration: none;
  color: #150e04;
  background: linear-gradient(180deg, #ffcc4d 0%, #f3a42c 50%, #dd781b 100%);
  border-radius: 6px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .5),
    inset 0 -2px 0 rgba(0, 0, 0, .22),
    0 0 0 1px rgba(0, 0, 0, .6),
    0 12px 34px -8px rgba(240, 140, 30, .65);
  animation: glow 2.8s ease-in-out infinite;
  transition: transform .12s, filter .2s;
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: repeating-linear-gradient(-45deg, rgba(0, 0, 0, .05) 0 8px, transparent 8px 16px);
}
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, transparent 35%, rgba(255, 255, 255, .5) 50%, transparent 65%);
  transform: translateX(-120%);
  animation: sheen 5s 1.8s ease-in-out infinite;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px) scale(.992); }
.btn:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }

.btn__icon { flex: none; width: 26px; height: 26px; fill: currentColor; }

@keyframes sheen {
  0%   { transform: translateX(-120%); }
  30%, 100% { transform: translateX(120%); }
}
@keyframes glow {
  50% {
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, .5),
      inset 0 -2px 0 rgba(0, 0, 0, .22),
      0 0 0 1px rgba(0, 0, 0, .6),
      0 14px 46px -6px rgba(240, 140, 30, .9);
  }
}

.cta__note {
  margin: 12px 0 0;
  text-align: center;
  font: 12px/1.4 var(--mono);
  letter-spacing: .04em;
  color: var(--ink-mute);
}

/* ---------- Появление ---------- */

.r { animation: rise .8s cubic-bezier(.2, .7, .2, 1) both; animation-delay: var(--d, 0s); }
.title.r { animation-name: power; animation-duration: 1.1s; }
/* Кнопка видна сразу, даже если анимации не запустятся */
.r--lift { animation-name: lift; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
}
@keyframes lift {
  from { transform: translateY(14px); }
}
@keyframes power {
  0%   { opacity: 0; }
  10%  { opacity: .6; }
  14%  { opacity: .1; }
  22%  { opacity: .9; }
  26%  { opacity: .3; }
  40%, 100% { opacity: 1; }
}

/* ---------- Экраны разной высоты ---------- */

@media (max-height: 700px) {
  .page { gap: 14px; padding-top: calc(env(safe-area-inset-top) + 18px); padding-bottom: calc(env(safe-area-inset-bottom) + 18px); }
  .title { font-size: clamp(54px, 18vw, 100px); }
  .hazard { margin: 10px auto 8px; }
  .steps li { padding: 8px 10px; }
  .btn { min-height: 62px; }
}
@media (max-height: 580px) {
  .signal, .hazard { display: none; }
  .title { font-size: clamp(46px, 14vw, 80px); }
  .hint { font-size: 12px; }
}
@media (min-width: 768px) {
  .city { height: 64%; }
  .page { max-width: 540px; }
}

/* ---------- Уменьшение анимаций ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}