/* Shantell Sans (лицензия SIL OFL), вариативный: насыщенность 300-800, оси BNCE и INFM */
@font-face {
  font-family: "Shantell Sans";
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url("fonts/shantell-sans-cyrillic.woff2") format("woff2");
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: "Shantell Sans";
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url("fonts/shantell-sans-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: light;

  --milk: #FFF7F2;
  --blush: #FFE1E8;
  --marsh: #FFC2D1;
  --candy: #FF8FB0;
  --rasp: #D8306F;
  --cocoa: #5B2B3F;
  --cocoa-soft: #8A4A62;
  --white: #FFFDFB;

  /* слои: плед поверх котят, подписи и облачка поверх пледа, кнопка звука, летающие сердечки */
  --z-blanket: 2;
  --z-label: 3;
  --z-bubble: 4;
  --z-chrome: 10;
  --z-sky: 30;

  --font: "Shantell Sans", "Nunito", "Trebuchet MS", system-ui, sans-serif;
  --spring: cubic-bezier(.3, 1.6, .5, 1);

  /* ширина одного котёнка: от неё считаются плед, подписи и облачка */
  --k: clamp(96px, min(27vw, 26vh), 220px);
}

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

body {
  margin: 0;
  background: var(--blush);
  color: var(--cocoa);
  font-family: var(--font);
  font-size: 1.125rem;
  font-weight: 500;
  font-variation-settings: "BNCE" 0, "INFM" 30;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: var(--candy);
  color: var(--white);
}

button {
  font: inherit;
  color: inherit;
  font-variation-settings: inherit;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

:focus-visible {
  outline: 3px dashed var(--rasp);
  outline-offset: 4px;
  border-radius: 14px;
}

h2 {
  margin: 0 0 1.25rem;
  font-size: clamp(1.9rem, 5.5vw, 3rem);
  font-weight: 800;
  font-variation-settings: "BNCE" 20, "INFM" 100;
  line-height: 1.1;
  text-wrap: balance;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* кнопка-таблетка: звук и подпись конверта */
.sound,
.envelope__label {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .9rem;
  border: 3px solid var(--cocoa);
  border-radius: 999px;
  background: var(--milk);
  box-shadow: 0 3px 0 var(--cocoa);
  font-size: .95rem;
  font-weight: 700;
  line-height: 1.2;
}

/* ---------- звук ---------- */

.sound {
  position: absolute;
  top: max(.75rem, env(safe-area-inset-top));
  right: .75rem;
  z-index: var(--z-chrome);
  min-height: 2.75rem;
  padding-left: .65rem;
  cursor: pointer;
  transition: background-color .2s;
}

.sound:active {
  transform: translateY(3px);
  box-shadow: none;
}

.sound svg {
  width: 1.35rem;
  height: 1.35rem;
  fill: currentColor;
}

.sound__off,
.sound[aria-pressed="false"] .sound__on {
  display: none;
}

.sound[aria-pressed="false"] .sound__off {
  display: inline;
}

@media (max-width: 520px) {
  .sound {
    justify-content: center;
    min-width: 2.75rem;
    padding: .5rem;
  }

  .sound span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
}

/* ---------- первый экран ---------- */

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 88svh;
  padding: 4rem 1rem 0;
  overflow: hidden;
  background-color: var(--blush);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='170' height='170'%3E%3Cg fill='%23FFC2D1' opacity='.55'%3E%3Cpath transform='translate(18 24) rotate(-14 12.8 12.8) scale(.1)' d='M240,102c0,70-103.79,126.66-108.21,129a8,8,0,0,1-7.58,0C119.79,228.66,16,172,16,102A62.07,62.07,0,0,1,78,40c20.65,0,38.73,8.88,50,23.89C139.27,48.88,157.35,40,178,40A62.07,62.07,0,0,1,240,102Z'/%3E%3Cpath transform='translate(104 102) rotate(12 9 9) scale(.07)' d='M240,102c0,70-103.79,126.66-108.21,129a8,8,0,0,1-7.58,0C119.79,228.66,16,172,16,102A62.07,62.07,0,0,1,78,40c20.65,0,38.73,8.88,50,23.89C139.27,48.88,157.35,40,178,40A62.07,62.07,0,0,1,240,102Z'/%3E%3C/g%3E%3C/svg%3E");
}

.hero__top {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-bottom: 4.5rem;
  text-align: center;
}

.hello {
  margin: 0;
  color: var(--rasp);
  font-size: clamp(3rem, min(12vw, 17vh), 9rem);
  font-weight: 800;
  font-variation-settings: "BNCE" 0, "INFM" 100;
  line-height: 1.04;
  /* белая кайма, как у наклейки */
  text-shadow:
    .05em 0 var(--milk), -.05em 0 var(--milk), 0 .05em var(--milk), 0 -.05em var(--milk),
    .035em .035em var(--milk), -.035em .035em var(--milk), .035em -.035em var(--milk), -.035em -.035em var(--milk),
    .046em .019em var(--milk), -.046em .019em var(--milk), .046em -.019em var(--milk), -.046em -.019em var(--milk),
    .019em .046em var(--milk), -.019em .046em var(--milk), .019em -.046em var(--milk), -.019em -.046em var(--milk);
  filter: drop-shadow(0 .07em 0 rgba(216, 48, 111, .22));
}

.hello__word {
  display: inline-block;
  white-space: nowrap;
}

.hello__ch {
  display: inline-block;
  transform: rotate(var(--r, 0deg)) translateY(var(--y, 0em));
  animation: pop .5s var(--spring) both;
  animation-delay: calc(var(--i, 0) * 45ms + 150ms);
}

@keyframes pop {
  from {
    opacity: 0;
    transform: rotate(0deg) translateY(.4em) scale(0);
  }
}

.hero__line {
  max-width: 30ch;
  margin: 1.1rem 0 0;
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  text-wrap: balance;
}

.litter {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: clamp(.5rem, 2vw, 2rem);
  margin-bottom: calc(var(--k) * .33);
}

.blanket {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: var(--z-blanket);
  display: block;
  width: 100%;
  height: calc(var(--k) * .5);
  fill: var(--marsh);
  pointer-events: none;
}

/* ---------- котёнок ---------- */

/* У самой кнопки нет transform: иначе подпись и облачко не смогут лечь поверх пледа. */
.kitten {
  position: relative;
  width: calc(var(--k) * var(--ks, 1));
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.kitten__rise {
  display: block;
  animation: rise .9s cubic-bezier(.2, 1.3, .4, 1) both;
  animation-delay: calc(var(--i, 0) * 140ms + 900ms);
}

@keyframes rise {
  from {
    transform: translateY(105%);
  }
}

.kitten__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  transform-origin: 50% 100%;
}

.kitten.is-squish .kitten__svg {
  animation: squish .5s ease-out;
}

@keyframes squish {
  30% {
    transform: scale(1.07, .91);
  }

  60% {
    transform: scale(.97, 1.04);
  }
}

.kitten__name {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: var(--z-label);
  margin-top: .1rem;
  font-size: clamp(.875rem, 1.6vw, 1rem);
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  transform: translateX(-50%) rotate(var(--tilt, -3deg));
}

.k-out {
  stroke: var(--cocoa);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.k-tail {
  transform-origin: 146px 198px;
  animation: sway 2.6s ease-in-out infinite alternate;
}

.kitten.is-happy .k-tail {
  animation-duration: .45s;
}

@keyframes sway {
  from {
    transform: rotate(-7deg);
  }

  to {
    transform: rotate(9deg);
  }
}

.k-head {
  transform-origin: 100px 132px;
  transition: transform .3s var(--spring);
}

@media (hover: hover) {
  .kitten:hover .k-head {
    transform: rotate(3deg);
  }

  .sound:hover {
    background: var(--blush);
  }

  .envelope:hover svg {
    transform: translateY(-4px) rotate(-1.5deg);
  }
}

.kitten.is-happy .k-head {
  transform: rotate(-5deg);
}

.k-look {
  transform: translate(calc(var(--ex, 0) * 1px), calc(var(--ey, 0) * 1px));
  transition: transform .12s ease-out;
}

.k-blink {
  transform-origin: 100px 90px;
  animation: blink 5s infinite;
  animation-delay: var(--blink, 0s);
}

@keyframes blink {
  0%,
  94%,
  100% {
    transform: scaleY(1);
  }

  97% {
    transform: scaleY(.1);
  }
}

.k-eyes-happy,
.k-eyes-sleep,
.kitten.is-happy .k-eyes-open,
.kitten.is-asleep .k-eyes-open {
  display: none;
}

.kitten.is-happy .k-eyes-happy,
.kitten.is-asleep:not(.is-happy) .k-eyes-sleep {
  display: inline;
}

.kitten.is-asleep:not(.is-happy) .k-tail {
  animation-play-state: paused;
}

/* облачко с репликой */
.bubble {
  --tx: -50%;
  position: absolute;
  bottom: calc(100% - var(--k) * .04);
  left: 50%;
  z-index: var(--z-bubble);
  width: max-content;
  min-width: calc(var(--k) * .8);
  max-width: min(15rem, 62vw);
  padding: .5rem .9rem;
  border: 3px solid var(--cocoa);
  border-radius: 1.3rem;
  background: var(--milk);
  font-size: clamp(1rem, 2vw, 1.1rem);
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translateX(var(--tx)) scale(0);
  transform-origin: 50% 100%;
  transition: transform .25s var(--spring), opacity .15s;
}

.bubble::after {
  content: "";
  position: absolute;
  bottom: -9px;
  left: calc(50% - 7px);
  width: 14px;
  height: 14px;
  border: solid var(--cocoa);
  border-width: 0 3px 3px 0;
  background: var(--milk);
  transform: rotate(45deg);
}

.kitten.is-talking .bubble {
  opacity: 1;
  transform: translateX(var(--tx)) scale(1);
}

/* у крайних котят облачко растёт внутрь экрана, чтобы не обрезаться на телефоне */
.kitten[data-edge="start"] .bubble {
  --tx: 0%;
  left: 10%;
  transform-origin: 25% 100%;
}

.kitten[data-edge="start"] .bubble::after {
  left: calc(var(--k) * .4 - 7px);
}

.kitten[data-edge="end"] .bubble {
  --tx: -100%;
  left: 90%;
  transform-origin: 75% 100%;
}

.kitten[data-edge="end"] .bubble::after {
  left: auto;
  right: calc(var(--k) * .4 - 7px);
}

/* ---------- письмо ---------- */

.mail {
  /* на пару пикселей заходит на плед, чтобы на стыке не просвечивал фон */
  position: relative;
  margin-top: -2px;
  padding: 1.25rem 1rem clamp(4rem, 10vw, 7rem);
  background: var(--marsh);
  text-align: center;
}

.pets {
  max-width: 34ch;
  min-height: 3.2em;
  margin: 0 auto clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  text-wrap: balance;
}

.envelope {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: min(20rem, 78vw);
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.envelope svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: -26%;
  overflow: visible;
  transition: margin-top .45s cubic-bezier(.3, 1, .4, 1), transform .2s ease-out;
}

.envelope[aria-expanded="true"] svg {
  margin-top: 0;
}

.envelope:active .envelope__label {
  transform: translateY(3px);
  box-shadow: none;
}

.envelope path,
.envelope rect {
  stroke: var(--cocoa);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.env-back {
  fill: #FFD3DF;
}

.env-pocket {
  fill: var(--milk);
}

.envelope .env-fold {
  fill: none;
  opacity: .22;
}

.env-sheet {
  transition: transform .5s cubic-bezier(.3, 1.3, .5, 1);
}

.env-sheet rect {
  fill: var(--white);
}

.envelope .env-sheet path {
  fill: none;
  stroke: var(--marsh);
}

/* клапан: закрытая половинка схлопывается, открытая вырастает позади листа */
.env-flap {
  fill: #FFEDE9;
  transform-origin: 160px 12px;
  transition: transform .22s ease-out .25s;
}

.env-flap-open {
  fill: #FFD3DF;
  transform: scaleY(0);
  transform-origin: 160px 14px;
  transition: transform .22s ease-in;
}

.env-seal {
  transform-origin: 160px 122px;
  transition: transform .3s var(--spring) .4s;
}

.envelope .env-seal path {
  fill: var(--rasp);
  stroke-width: 19;
}

.envelope[aria-expanded="true"] .env-flap {
  transform: scaleY(0);
  transition: transform .2s ease-in .1s;
}

.envelope[aria-expanded="true"] .env-flap-open {
  transform: scaleY(1);
  transition: transform .25s ease-out .3s;
}

.envelope[aria-expanded="true"] .env-sheet {
  transform: translateY(-84px);
  transition-delay: .45s;
}

.envelope[aria-expanded="true"] .env-seal {
  transform: scale(0);
  transition: transform .15s ease-in;
}

.letter {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .6s cubic-bezier(.3, 1, .4, 1);
}

.letter[hidden] {
  display: none;
}

.letter.is-open {
  grid-template-rows: 1fr;
}

.letter__clip {
  min-height: 0;
  padding: 0 .5rem;
  overflow: hidden;
}

.letter__paper {
  position: relative;
  max-width: 34rem;
  margin: 2.25rem auto 2.5rem;
  padding: 2.75rem clamp(1.25rem, 5vw, 3rem) 2.25rem;
  border-radius: 6px;
  background: var(--milk);
  box-shadow: 0 1.2rem 2.2rem -1.2rem rgba(150, 40, 90, .5);
  font-size: 1.2rem;
  font-variation-settings: "BNCE" 0, "INFM" 70;
  line-height: 2rem;
  text-align: left;
  transform: rotate(-1.2deg);
}

.letter__text {
  background-image: linear-gradient(transparent calc(2rem - 2px), #FFD3DF calc(2rem - 2px));
  background-position: 0 -.25rem;
  background-size: 100% 2rem;
}

.letter__text p {
  margin: 0;
}

.letter__text p + p {
  margin-top: 2rem;
}

.letter__text .letter__sign {
  color: var(--rasp);
  font-weight: 800;
  text-align: right;
}

.letter__sign svg {
  width: 1em;
  height: 1em;
  margin-left: .2em;
  fill: currentColor;
  vertical-align: -.12em;
}

.letter__paw {
  position: absolute;
  top: .7rem;
  right: 1rem;
  width: 2.4rem;
  height: 2.4rem;
  fill: var(--marsh);
  transform: rotate(18deg);
}

/* ---------- причины ---------- */

.reasons,
.bye {
  position: relative;
  padding: clamp(4.5rem, 10vw, 7rem) 1rem clamp(4rem, 10vw, 6rem);
  text-align: center;
}

.reasons {
  background: var(--milk);
}

/* кружевной край между цветными полосами */
.reasons::before,
.bye::before {
  content: "";
  position: absolute;
  top: -1px;
  right: 0;
  left: 0;
  height: 22px;
  background: radial-gradient(circle at 22px 0, var(--lace) 21px, transparent 22px) 50% 0 / 44px 22px repeat-x;
}

.reasons::before {
  --lace: var(--marsh);
}

.note {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 26ch;
  min-height: 4.2em;
  margin: 1.25rem auto 2rem;
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.3;
  text-wrap: balance;
}

.note[data-empty] {
  color: var(--cocoa-soft);
  font-weight: 500;
}

.note.is-fresh {
  animation: note-in .35s var(--spring);
}

@keyframes note-in {
  from {
    opacity: 0;
    transform: scale(.9) rotate(-2deg);
  }
}

.jar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(.5rem, 2vw, 1rem);
  max-width: 34rem;
  margin: 0 auto;
}

.heart {
  --s: 4.6rem;
  --fill: var(--rasp);
  --tilt: -8deg;
  width: var(--s);
  height: var(--s);
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  transform: rotate(var(--tilt));
  transition: transform .2s var(--spring);
}

.heart:nth-child(3n + 2) {
  --s: 3.9rem;
  --fill: var(--candy);
  --tilt: 9deg;
}

.heart:nth-child(3n) {
  --s: 5.1rem;
  --fill: var(--marsh);
  --tilt: 3deg;
}

.heart:nth-child(4n) {
  --tilt: -13deg;
}

.heart:hover {
  transform: rotate(var(--tilt)) scale(1.12);
}

.heart:active {
  transform: rotate(var(--tilt)) scale(.92);
}

.heart svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.heart path {
  fill: var(--fill);
  stroke: var(--cocoa);
  stroke-width: 14;
  stroke-linejoin: round;
  transition: fill .3s;
}

.heart[data-open] path {
  fill: transparent;
  stroke-dasharray: 17 26;
  stroke-linecap: round;
}

.reasons__count {
  max-width: 36ch;
  margin: 1.75rem auto 0;
  font-size: 1rem;
  font-weight: 700;
  text-wrap: balance;
}

/* ---------- подвал ---------- */

.bye::before {
  --lace: var(--milk);
}

.bye__kitten {
  position: relative;
  width: clamp(120px, 30vw, 170px);
  margin: 0 auto 1.25rem;
}

.bye__kitten .kitten {
  --k: clamp(120px, 30vw, 170px);
  display: block;
  width: 100%;
}

.bye__kitten .kitten__rise {
  animation: none;
}

.zzz {
  position: absolute;
  top: -2%;
  right: -6%;
  color: var(--rasp);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: .18em;
  opacity: .75;
  transform: rotate(-14deg);
  animation: zzz 2.4s ease-in-out infinite alternate;
  transition: opacity .2s;
}

.kitten.is-happy .zzz {
  opacity: 0;
}

@keyframes zzz {
  to {
    transform: rotate(-14deg) translate(4px, -8px);
  }
}

.bye p {
  margin: 0;
}

.bye .bye__days {
  margin-bottom: .4rem;
  font-size: clamp(1.3rem, 3.5vw, 1.8rem);
  font-weight: 800;
}

.bye__sign {
  font-weight: 700;
}

.bye .bye__ps {
  display: none;
  margin-top: 1.5rem;
  color: var(--cocoa-soft);
  font-size: .95rem;
}

@media (hover: hover) and (pointer: fine) {
  .bye .bye__ps {
    display: block;
  }
}

/* ---------- летающие сердечки ---------- */

.sky {
  position: fixed;
  inset: 0;
  z-index: var(--z-sky);
  overflow: hidden;
  pointer-events: none;
}

.sky svg {
  position: absolute;
  top: 0;
  left: 0;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
  }
}