:root {
  --sky: #88e4df;
  --ground: #fffcee;
  --ink: #5d423c;
  --panel-x: 100vw;
  --track-x: 0px;
  --walker-bob: 0px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ground);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", sans-serif;
  overscroll-behavior: none;
}

img {
  display: block;
}

/* ------------------------------
   トップ画面
------------------------------ */

.opening {
  position: fixed;
  z-index: 1;
  inset: 0;
  height: 100vh;
}

.opening__sticky {
  position: relative;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  background: #dff4f8;
}

.opening__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.opening__sticky::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 48%,
    rgba(222, 246, 249, 0.12) 65%,
    rgba(222, 246, 249, 0.3)
  );
  content: "";
  pointer-events: none;
}

.opening__copy {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: clamp(34px, 7vw, 120px);
  width: min(26vw, 390px);
  text-align: center;
  transform: translateY(-50%);
}

.opening__copy p {
  margin: 1.2em 0 0;
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: clamp(14px, 1.25vw, 19px);
  font-weight: 700;
  letter-spacing: 0.16em;
}

.opening__copy img {
  width: 100%;
  mix-blend-mode: multiply;
}

/* ------------------------------
   右から現れる横スクロール画面
------------------------------ */

.horizontal {
  position: relative;
  z-index: 10;
  height: 900vh;
}

.horizontal__sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  background: var(--sky);
  box-shadow: -14px 0 40px rgba(93, 66, 60, 0.14);
  transform: translate3d(var(--panel-x), 0, 0);
  will-change: transform;
}

.walking-logo {
  position: absolute;
  z-index: 60;
  top: 24px;
  left: 28px;
  width: clamp(120px, 12vw, 190px);
  border-radius: 4px;
  transition: opacity 180ms ease;
}

.walking-logo:hover {
  opacity: 0.72;
}

.walking-logo:focus-visible {
  outline: 3px solid var(--ground);
  outline-offset: 5px;
}

.walking-logo img {
  width: 100%;
  height: auto;
}

.track {
  position: absolute;
  inset: 0 auto 0 0;
  width: max-content;
  transform: translate3d(var(--track-x), 0, 0);
  will-change: transform;
}

.journey {
  position: relative;
  width: 1510vh;
  min-width: 12200px;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
}

.sky,
.ground {
  position: absolute;
  inset-inline: 0;
}

.sky {
  top: 0;
  height: 80%;
  background: var(--sky);
}

.ground {
  bottom: 0;
  height: 20%;
  background: var(--ground);
}

/* ------------------------------
   雲
------------------------------ */

.cloud {
  position: absolute;
  z-index: 1;
  width: 18vh;
  height: auto;
  object-fit: contain;
}

.cloud--1 {
  top: 17vh;
  left: 15vh;
}

.cloud--2 {
  top: 9vh;
  left: 122vh;
  transform: scale(0.72);
}

.cloud--3 {
  top: 18vh;
  left: 258vh;
  transform: scale(0.66);
}

.cloud--4 {
  top: 11vh;
  left: 394vh;
  transform: scale(0.76);
}

.cloud--5 {
  top: 15vh;
  left: 462vh;
  transform: scale(0.64);
}

.cloud--6 {
  top: 10vh;
  left: 525vh;
  transform: scale(0.82);
}

.cloud--7 {
  top: 17vh;
  left: 650vh;
  transform: scale(0.7);
}

.cloud--8 {
  top: 9vh;
  left: 770vh;
  transform: scale(0.84);
}

.cloud--9 {
  top: 16vh;
  left: 900vh;
  transform: scale(0.68);
}

.cloud--10 {
  top: 10vh;
  left: 1050vh;
  transform: scale(0.8);
}

.cloud--11 {
  top: 17vh;
  left: 1165vh;
  transform: scale(0.68);
}

.cloud--12 {
  top: 9vh;
  left: 1280vh;
  transform: scale(0.82);
}

.cloud--13 {
  top: 16vh;
  left: 1390vh;
  transform: scale(0.72);
}

/* ------------------------------
   テキスト
------------------------------ */

.scene {
  position: absolute;
  z-index: 30;
}

.scene--intro {
  top: 30vh;
  left: 64vw;
  width: min(34vw, 66vh);
  font-size: clamp(13px, 1.58vh, 17px);
  font-weight: 900;
  line-height: 2;
}

.scene--intro p + p,
.scene--finish p + p {
  margin-top: 1.35em;
}

.scene--finish {
  top: 31vh;
  left: 1430vh;
  width: 53vh;
  font-size: clamp(13px, 1.9vh, 20px);
  font-weight: 900;
  line-height: 2;
}

/* ------------------------------
   1個目の街灯まわり
------------------------------ */

.streetlight-stage {
  position: absolute;
  z-index: 12;
  bottom: 18vh;
  left: 287vh;
  width: 118vh;
  height: 66vh;
  pointer-events: none;
}

.streetlight-stage img {
  position: absolute;
  bottom: 0;
  width: auto;
  object-fit: contain;
}

.stage-building {
  z-index: 1;
  bottom: 2vh !important;
  width: 160vh !important;
  height: auto;
}

.stage-building--main {
  left: calc(10vh - 42px);
}

.stage-shop {
  z-index: 2;
  height: 53vh;
}

.stage-shop--1 {
  left: 27vh;
}

.stage-shop--2 {
  left: 55vh;
  height: 55vh;
}

.stage-sign {
  z-index: 3;
  height: 37vh;
}

.stage-sign--1 {
  left: calc(10vh - 24px);
}

.stage-sign--2 {
  left: calc(20vh - 24px);
  height: 41vh;
}

.stage-sign--3 {
  right: 13vh;
}

.stage-sign--4 {
  right: 2vh;
  height: 40vh;
}

.stage-cone {
  z-index: 4;
  height: 8vh;
}

.stage-cone--1 {
  left: 23vh;
}

.stage-cone--2 {
  right: 22vh;
}

/* ------------------------------
   2個目の街灯まわり
------------------------------ */

.streetlight-stage--2 {
  bottom: 45px;
  left: calc(410vh + 240px);
  width: 200vh;
  height: 100vh;
}

.streetlight-stage--2 .stage-02-layer {
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stage-02-building {
  z-index: 1;
}

.stage-02-redgate {
  z-index: 2;
}

.stage-02-tree-01,
.stage-02-tree-02 {
  z-index: 3;
}

.stage-02-pole {
  z-index: 4;
}

.stage-02-clock {
  z-index: 5;
}

.stage-02-cone {
  z-index: 6;
}

/* ------------------------------
   3個目の街灯まわり
------------------------------ */

.streetlight-stage--3 {
  bottom: 45px;
  left: calc(610vh + 480px);
  width: 200vh;
  height: 100vh;
}

.streetlight-stage--3 .stage-03-layer {
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stage-03-guardrail {
  z-index: 1;
}

.stage-03-tree-01,
.stage-03-tree-02 {
  z-index: 2;
}

.stage-03-call {
  z-index: 3;
}

/* ------------------------------
   4・5個目の街灯まわり
------------------------------ */

.streetlight-stage--4,
.streetlight-stage--5 {
  bottom: 45px;
  width: 200vh;
  height: 100vh;
}

.streetlight-stage--4 {
  left: calc(810vh + 720px);
}

.streetlight-stage--5 {
  left: calc(1010vh + 960px);
}

.streetlight-stage--4 .stage-04-layer,
.streetlight-stage--5 .stage-05-layer {
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.stage-04-torii,
.stage-05-building-01 {
  z-index: 1;
}

.stage-04-tree,
.stage-05-building-02 {
  z-index: 2;
}

.stage-04-bicycle-01,
.stage-05-building-03 {
  z-index: 3;
}

.stage-04-bicycle-02,
.stage-05-signboard {
  z-index: 4;
}

.stage-05-bicycle-01 {
  z-index: 5;
}

.stage-05-bicycle-02 {
  z-index: 6;
}

/* ------------------------------
   街灯
------------------------------ */

.lamp {
  position: absolute;
  z-index: 20;
  bottom: 18vh;
  height: 62vh;
  aspect-ratio: 528 / 1390;
  cursor: pointer;
  text-decoration: none;
}

.lamp img {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
  transition: opacity 0.3s ease;
}

.lamp__image--on {
  z-index: 2 !important;
  opacity: 0;
  transform: translateX(15px);
}

.lamp:focus-visible {
  outline: none;
}

.lamp:hover .lamp__image--off,
.lamp:focus-visible .lamp__image--off,
.lamp.is-alpha-hovered .lamp__image--off {
  opacity: 0;
}

.lamp:hover .lamp__image--on,
.lamp:focus-visible .lamp__image--on,
.lamp.is-alpha-hovered .lamp__image--on {
  opacity: 1;
}

.lamp--1 {
  z-index: 45;
  bottom: calc(18vh - 92px);
  left: calc(337vh - 35px);
  height: 88vh;
  transform: translate3d(var(--track-x), 0, 0);
  will-change: transform;
}

.lamp--2 {
  z-index: 45;
  bottom: -30px;
  left: calc(410vh + 240px);
  width: 200vh;
  height: 100vh;
  aspect-ratio: 2 / 1;
  pointer-events: none;
  cursor: default;
  transform: translate3d(var(--track-x), 0, 0);
  will-change: transform;
}

.lamp--2 .lamp__image--on {
  transform: none;
}

.lamp--3 {
  z-index: 45;
  bottom: -30px;
  left: calc(610vh + 420px);
  width: 200vh;
  height: 100vh;
  aspect-ratio: 2 / 1;
  pointer-events: none;
  cursor: default;
  transform: translate3d(var(--track-x), 0, 0);
  will-change: transform;
}

.lamp--3 .lamp__image {
  transform: scale(1.15);
  transform-origin: 33% bottom;
}

.lamp--4,
.lamp--5 {
  z-index: 45;
  bottom: -30px;
  width: 200vh;
  height: 100vh;
  aspect-ratio: 2 / 1;
  pointer-events: none;
  cursor: default;
  transform: translate3d(var(--track-x), 0, 0);
  will-change: transform;
}

.lamp--4 {
  left: calc(810vh + 720px);
}

.lamp--5 {
  left: calc(1010vh + 960px);
}

.lamp--4 .lamp__image--on,
.lamp--5 .lamp__image--on {
  transform: none;
}

/* ------------------------------
   歩く人物
------------------------------ */

.walker {
  position: absolute;
  z-index: 40;
  pointer-events: none;
  left: clamp(70px, 19vw, 300px);
  bottom: 13vh;
  width: clamp(165px, 26vh, 270px);
  height: 41vh;
  filter: drop-shadow(0 10px 8px rgba(93, 66, 60, 0.12));
  pointer-events: none;
  transform: translateY(var(--walker-bob));
}

.walker__pose {
  position: absolute;
  inset: 0;
  display: none;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
  transform: translateY(4%);
}

.walker.is-walking-backward .walker__pose {
  transform: translateY(4%) scaleX(-1);
}

.walker:not(.has-passed-intro):not(.is-looking-up)
  .walker__pose--phone.walker__pose--1 {
  display: block;
}

.walker:not(.has-passed-intro):not(.is-looking-up).is-step-two
  .walker__pose--phone.walker__pose--1 {
  display: none;
}

.walker:not(.has-passed-intro):not(.is-looking-up).is-step-two
  .walker__pose--phone.walker__pose--2 {
  display: block;
}

.walker.has-passed-intro:not(.is-looking-up)
  .walker__pose--front.walker__pose--1 {
  display: block;
}

.walker.has-passed-intro:not(.is-looking-up).is-step-two
  .walker__pose--front.walker__pose--1 {
  display: none;
}

.walker.has-passed-intro:not(.is-looking-up).is-step-two
  .walker__pose--front.walker__pose--2 {
  display: block;
}

.walker.is-looking-up .walker__pose--up.walker__pose--1 {
  display: block;
}

.walker.is-looking-up.is-step-two .walker__pose--up.walker__pose--1 {
  display: none;
}

.walker.is-looking-up.is-step-two .walker__pose--up.walker__pose--2 {
  display: block;
}

/* ------------------------------
   右下のナビゲーション
------------------------------ */

.corner-nav {
  position: fixed;
  z-index: 4000;
  right: 18px;
  bottom: 16px;
  display: flex;
  align-items: center;
  width: min(36vw, 380px);
  filter: drop-shadow(0 5px 9px rgba(93, 66, 60, 0.14));
}

.corner-nav__top {
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  color: var(--ground);
  background: var(--ink);
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
}

.corner-nav__line {
  position: relative;
  display: flex;
  flex: 1;
  height: 32px;
  align-items: center;
  justify-content: space-between;
}

.corner-nav__line::before {
  position: absolute;
  z-index: -1;
  top: 50%;
  right: 14px;
  left: 14px;
  height: 2px;
  background: rgba(93, 66, 60, 0.72);
  content: "";
  transform: translateY(-50%);
}

.corner-nav__dot {
  display: grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  padding: 0;
  place-content: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.corner-nav__dot::before {
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  content: "";
  transition: transform 160ms ease;
}

.corner-nav__dot:hover::before,
.corner-nav__dot:focus-visible::before {
  transform: scale(1.55);
}

.corner-nav__dot:focus-visible,
.corner-nav__top:focus-visible {
  outline: 3px solid var(--ground);
  outline-offset: 2px;
}

/* ------------------------------
   スマートフォン表示
------------------------------ */

@media (max-width: 720px) {
  .opening__image {
    object-position: 46% center;
  }

  .opening__sticky::after {
    background: linear-gradient(
      0deg,
      rgba(222, 246, 249, 0.5),
      transparent 55%
    );
  }

  .opening__copy {
    top: auto;
    right: 7vw;
    bottom: 10vh;
    width: 49vw;
    transform: none;
  }

  .opening__copy p {
    font-size: 12px;
    letter-spacing: 0.1em;
  }

  .walker {
    left: 3vw;
    bottom: 16vh;
    width: 18vh;
    height: 31vh;
  }

  .walking-logo {
    top: 16px;
    left: 16px;
    width: 108px;
  }

  .corner-nav {
    right: 10px;
    bottom: 10px;
    width: min(78vw, 350px);
  }

  .corner-nav__top {
    flex-basis: 42px;
    width: 42px;
    height: 42px;
    font-size: 16px;
  }

  .corner-nav__dot {
    flex-basis: 24px;
    width: 24px;
    height: 24px;
  }
}

/* OSで動きを減らす設定が有効な場合 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}