/* fonts */
@import url('https://fonts.googleapis.com/css2?family=Lobster&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* main style */

:root {
  --color-bg: #37474F;
  --color-primary: #039BE5;
  --color-secondary: #880E4F;
  --color-dark: #01579B;
  --color-shadow: rgba(0,0,0,.32);
  --color-paper: #FCE8D0;
  --font-body: "Noto Sans JP", verdana, roboto, sans-serif;
  --font-heading: "Lobster", arial, serif;
  --perspective: 1000px;
}

*, *::before, *::after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  outline: none;
/*   backface-visibility: hidden; */
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 100vh;
  background-color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 30px;
}
h1, h2, h3, h4, h5 {
  font-size: 1.2rem;
  font-family: var(--font-heading);
  letter-spacing: 1px;
}

.paper {
  width: 600px;
  height: 500px;
  background-color: white;
  display: flex;
  perspective: var(--perspective);
  cursor: pointer;
}

.paper > [class*="paper"]:not(.paper-main) {
  width: 50%;
  height: 100%;
  display: block;
  position: absolute;
  top: 0;
/*   opacity: 0;
  display: none; */
}
.paper > .paper-left {
  transform-origin: left center;
  transform: rotateY(-0deg);
  box-shadow: 2px 6px 8px -2px var(--color-shadow);
  z-index: 2;
  perspective: var(--perspective);
  left: 0;
  animation: paper-left-open 2s 2s ease-in forwards;
  animation-play-state: running;
}
.paper:hover > .paper-left {
/*   animation: paper-left-open 2s 2s ease-in forwards; */
  animation-play-state: running;
}
.paper > .paper-right {
  transform-origin: right center;
  transform: rotateY(-0deg);
  box-shadow: -2px 6px 8px -2px var(--color-shadow);
  z-index: 1;
  right: 0;
  animation: paper-right-open 2s 2s ease-in forwards;
  animation-play-state: running;
}
.paper:hover > .paper-right {
/*   animation: paper-right-open 2s 2s ease-in forwards; */
  animation-play-state: running;
}

.paper-left-front, .paper-right-front {
  width: 100%;
  height: 100%;
  display: block;
  background-image: url('../img/fm.jpg');
  background-size: cover;
  background-position: left center;
  background-repeat: no-repeat;
  position: relative;
}
.paper-left-front {
  perspective: 750px;
}
.paper-right-front {
  background-position: -300px center;
}
.paper-left-front .paper-lock {
  position: absolute;
  top: 50%;
  left: calc(100% - 90px);
  width: 260px;
  padding: 10px 10px;
  background-color: var(--color-secondary);
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  transform-origin: 18% center;
  transform: translateY(-50%) rotateY(0deg);
  font-weight: 600;
  clip-path: polygon(0 0, 100% 0, 90% 50%, 100% 100%, 0 100%, 10% 50%);
  box-shadow: inset 0px 0px 0 3px var(--color-shadow);
  animation: paper-lock-move .8s .1s ease-in forwards;
  animation-play-state: running;
}
.paper-left-front .paper-lock span {
  font-size: .8em;
  padding-top: 5px;
  margin-top: 6px;
  border-top: 1px solid white;
}

.paper-left-back, .paper-right-back {
  background-color: var(--color-paper);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  color: black;
  transform: rotateY(180deg);
  z-index: -1;
  opacity: 0;
}
.paper-left-back, .paper-right-back {
/*   z-index: 2; */
  animation: opacity-in 1s 3s forwards;
}
.paper-left-front, .paper-right-front {
  animation: opacity-out 1s 3s forwards;
}
.paper-left-back {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--color-secondary);
  padding: 30px 0;
}
.paper-left-back h3 {
  font-size: 45px;
}
.paper-left-back .paper-spacer {
  position: relative;
  display: flex;
  align-tiems: center;
  text-transform: uppercase;
  margin: 8px 0;
}
.paper-left-back .paper-spacer::before, .paper-left-back .paper-spacer::after {
  width: 100px;
  height: 1em;
  margin: 5px 8px;
  background-color: var(--color-secondary);
  content: "";
  clip-path: polygon(0 50%, 100% 0, 100% 100%, 0 60%, 0% 100%, 60% 100%, 0 80%);
}
.paper-left-back .paper-spacer::after {
  transform: rotate(180deg);
}
.paper-left-back h5 {
  letter-spacing: 5px;
  text-decoration: underline;
  line-height: 1.5;
  background-color: var(--color-secondary);
  color: var(--color-paper);
  width: 100%;
  padding: 10px;
}
.paper-left-back .paper-misc {
  margin-top: 40px;
  width: 20px;
  height: 200px;
  background-color: var(--color-secondary);
  position: relative;
  z-index: 1;
}
.paper-left-back .paper-misc::before, .paper-left-back .paper-misc::after {
  height: 75%;
  width: 100%;
  content: "";
  background-color: var(--color-secondary);
  position: absolute;
  z-index: 1;
}
.paper-left-back .paper-misc::before {
  top: 50%;
  right: calc(100% + 10px);
  transform: translateY(-50%);
}
.paper-left-back .paper-misc::after {
  top: 50%;
  left: calc(100% + 10px);
  transform: translateY(-50%);
}

/* main content */
.paper-main {
  background-image: url('../img/map.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: block;
  width: 100%;
  height: 100%;
}
.paper-main .paper-top-label {
  background-color: rgba(0,0,0,.75);
  width: 60%;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 10px 24px;
  border-bottom-left-radius: 50%;
  border-bottom-right-radius: 50%;
  mix-blend-mode: darken;
}
.paper-main .paper-heading {
  font-size: 30px;
  color: white;
  text-shadow: 0 0 3px black;
  display: block;
  text-align: center;
}
.paper-main .paper-subheading {
  font-size: 18px;
  color: white;
  text-shadow: 0 0 3px black;
  display: block;
  text-align: center;
  font-family: var(--font-body);
  font-weight: bold;
  letter-spacing: 3px;
}

/* map interaction */
.map-container {
  position: relative;
  width: 100%;
  height: 100%;
  z-index: 1;
  perspective: var(--perspective);
}
.map-container .map-legend {
  position: absolute;
  top: 70%;
  left: 10%;
  z-index: 1;
}
.map-container .map-legend:nth-child(2) {
  top: 54%;
  left: 24%;
  z-index: 2;
}
.map-container .map-legend:nth-child(3) {
  top: 32%;
  left: 46%;
  z-index: 3;
}
.map-container .map-legend:nth-child(4) {
  top: 69%;
  left: 84%;
  z-index: 4;
}
.map-container .map-legend:nth-child(5) {
  top: 36%;
  left: 81%;
  z-index: 5;
}
.map-container .map-legend::after {
  display: block;
  width: 101px;
  height: 1px;
  border-top: 4px dashed var(--color-primary);
  content: "";
  position: absolute;
  top: 50%;
  left: 100%;
  transform-origin: left center;
  transform: translateY(-150%) rotate(-44deg);
  z-index: -1;
}
.map-container .map-legend:nth-child(2)::after {
  width: 155px;
  transform: translateY(-150%) rotate(-41deg);
}
.map-container .map-legend:nth-child(3)::after {
  width: 284px;
  transform: translateY(0%) rotate(40.3deg);
}
.map-container .map-legend:nth-child(4)::after {
  width: 155px;
  transform: translateY(-173%) translateX(-4%) rotate(-96deg);
}
.map-container .map-legend:nth-child(5)::after {
  display: none;
}
.map-container .map-legend:hover {
  z-index: 10;
}
.map-legend .map-legend-dot {
  display: block;
  width: 13px;
  height: 13px;
  background-color: var(--color-primary);
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--color-shadow);
  position: relative;
  z-index: 2;
  transition: transform .2s ease-in-out;
}
.map-legend:hover .map-legend-dot {
  background-color: var(--color-dark);
  box-shadow: inset 0 0 0 2px var(--color-primary), 2px 2px 3px var(--color-shadow);
  transform: translateY(-2px);
  transition: transform .2s ease-in-out;
}
.map-legend .map-popup {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  top: 0;
  left: calc(100% + 8px);
  width: 260px;
  height: auto;
  background-color: white;
  border: 2px solid white;
  box-shadow: 2px 2px 4px var(--color-shadow);
}
.map-legend:nth-last-child(-n+2) .map-popup {
  left: unset;
  right: calc(100% + 8px);
}
.map-legend:hover .map-popup {
  opacity: 1;
  visibility: visible;
  top: -34px;
  transition: visibility .05s, opacity .3s .1s ease-in, top .3s .1s ease-in;
}
.map-legend .map-popup h5 {
  padding: 10px;
  border-bottom: 1px solid var(--color-shadow);
  background-color: var(--color-primary);
  color: white;
  text-shadow: 0 0 4px var(--color-shadow);
  margin-bottom: 0;
}
.map-legend .map-popup img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  position: absolute;
  z-index: 2;
  bottom: calc(100% - 44px);
  left: calc(100% - 44px);
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 2px 2px 4px var(--color-shadow), inset 0 0 2px white;
}
.map-legend .map-popup p {
  padding: 10px;
}
.map-legend .map-popup p::first-letter {
  font-weight: 600;
  font-size: 1.1em;
  font-family: var(--font-heading);
}


/* animation */
@keyframes paper-lock-move {
  from {
    transform: translateY(-50%) rotateY(0) rotateZ(0deg);
  }
  to {
    transform: translateY(-50%) rotateY(0) rotateZ(90deg);
  }
}

@keyframes paper-left-open {
  from {
    transform: rotateY(10deg);
  }
  to {
    transform: rotateY(-170deg);
  }
}
@keyframes paper-right-open {
  from {
    transform: rotateY(10deg);
  }
  to {
    transform: rotateY(170deg);
  }
}

@keyframes opacity-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes opacity-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}