:root {
  /* color guide */
  --color-drop-shadow: rgba(0, 0, 0, 0.25);
  --color-overlay-shadow: rgba(0, 0, 0, 0.8);
  --color-text-main: rgba(255, 255, 255, 1);
  --color-text-sub: rgba(202, 202, 202, 1);
  --color-white: rgba(255, 255, 255, 1);
  --color-gray: rgba(202, 202, 202, 1);
  --color-dark: rgba(0, 36, 39, 1);
  --color-main: rgba(0, 73, 80, 1);
  --color-bright: rgba(45, 121, 128, 1);
  --color-other-dark: rgba(178, 80, 60, 1);
  --color-other-bright: rgba(204, 102, 82, 1);
  /* font style guide */
  --font-weight-bold: 700;
  --font-weight-semibold: 600;
  --font-weight-medium: 500;
  --font-weight-regular: 400;
  --font-weight-light: 300;
  --font-weight-extralight: 200;
  --font-weight-thin: 100;
  --font-size-h-desktop: 6rem;
  --font-size-h-phone: 3rem;
  --font-size-title-l: 2.5rem;
  --font-size-title-m: 2rem;
  --font-size-title-s: 1.5rem;
  --font-size-subheading: 1.5rem;
  --font-size-body-l: 1.5rem;
  --font-size-body-s: 1rem;
  --font-size-button-l: 1.5rem;
  --font-size-button-m: 1rem;
  --font-size-button-s: 0.875rem;
  --font-size-cap-l: 1.5rem;
  --font-size-cap-s: 1rem;
}
/* font style guide */
html {
  font-family: "Josefin Sans", sans-serif;
  font-optical-sizing: auto;
  font-weight: var(--font-weight-regular);
  font-style: normal;
  font-size: 16px;
}

.bold,
b,
strong {
  font-weight: var(--font-weight-bold);
}
h1,
.hero {
  font-size: var(--font-size-h-desktop);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
}
.h2 {
  font-size: var(--font-size-h-phone);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
}
h3,
.title.l {
  font-size: var(--font-size-title-l);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
}
h4,
.title {
  font-size: var(--font-size-title-m);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
}
h5,
h6,
.title.s {
  font-size: var(--font-size-title-s);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-main);
}
.subheading {
  font-size: var(--font-size-subheading);
  color: var(--color-text-sub);
}
p,
.body,
li {
  font-size: var(--font-size-body-l);
  color: var(--color-text-main);
}
.body.s {
  font-size: var(--font-size-body-s);
  color: var(--color-text-main);
}
button.l,
.button.l {
  font-size: var(--font-size-button-l);
  color: var(--color-text-main);
  text-box: trim-end cap alphabetic;
}
button,
.button,
.tag,
button.tag,
input,
input::placeholder {
  font-family: "Josefin Sans", sans-serif;
  font-optical-sizing: auto;
  font-weight: var(--font-weight-regular);
  font-style: normal;
  font-size: var(--font-size-button-m);
  color: var(--color-text-main);
  text-box: trim-end cap alphabetic;
}
.cap {
  font-size: var(--font-size-cap-l);
  color: var(--color-text-main);
}
.cap.s {
  font-size: var(--font-size-cap-s);
  color: var(--color-text-main);
}
h1,
h2,
h3,
h4,
h5,
h6,
p {
  padding: 0;
  margin: 0;
}
@media (max-width: 1000px) {
  h1,
  .hero {
    font-size: var(--font-size-h-phone);
  }
  h4,
  .title {
    font-size: var(--font-size-title-s);
    font-weight: var(--font-weight-medium);
  }
  p,
  .body {
    font-size: var(--font-size-body-s);
  }
  .tag {
    font-size: var(--font-size-button-s);
    color: var(--color-text-main);
    text-box: trim-end cap alphabetic;
  }
  .cap {
    font-size: var(--font-size-cap-s);
    color: var(--color-text-main);
  }
}
/* general */
:root {
  --border-radius: 1.5rem;
}
html {
  scroll-behavior: smooth;
  --footer-animation-range-start: 0%;
}
body {
  background-color: var(--color-bright);
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
/* header */
header {
  padding: 1rem 0;
  width: 100%;
  background-color: var(--color-main);
  display: flex;
  justify-content: center;
}
header button {
  border: none;
  cursor: pointer;
  background-color: var(--color-main);
}
/* main */
main {
  background-color: var(--color-dark);
  background-size: cover;
  display: flex;
  min-height: calc(100dvh - 58px);
  padding-bottom: 3rem;
  flex-direction: column;
  align-items: center;
  align-self: stretch;
  flex: 1 0 auto;
  z-index: 2;
  box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
}
section.hero {
  display: flex;
  padding: 7.5rem 0;
  justify-content: center;
  align-items: center;
  gap: 0.625rem;
  align-self: stretch;
}
section.hero h1 {
  text-align: center;
}

/* Search bar */
search {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  align-self: stretch;
}
.search_bar {
  display: flex;
  padding: 0 3rem;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  align-self: stretch;
}
.search_input {
  border-radius: var(--border-radius);
  background-color: var(--color-main);
  display: flex;
  max-width: 20rem;
  padding: 0.5rem;
  align-items: center;
  gap: 1rem;
  flex: 1 0 auto;
}
.search_input input {
  height: 100%;
  width: 100%;
  background-color: var(--color-main);
  border-style: none;
}
.search_input input:focus {
  border: none;
  outline: none;
}
.search_input input::placeholder {
  color: var(--color-text-sub);
}
.search_input input::-webkit-search-decoration,
.search_input input::-webkit-search-cancel-button,
.search_input input::-webkit-search-results-button,
.search_input input::-webkit-search-results-decoration {
  display: none;
}
input::-ms-clear,
input::-ms-reveal {
  display: none;
  width: 0;
  height: 0;
}
button#filter_button {
  background-color: var(--color-main);
  border-radius: var(--border-radius);
  border: none;
  display: flex;
  padding: 0.5rem 1rem;
  justify-content: center;
  align-items: center;
  gap: 0.625rem;
}
button#filter_button:active {
  background-color: var(--color-bright);
}

/* project list */
ul.project_list {
  list-style-type: none;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  align-content: flex-start;
  gap: 1.5rem;
  align-self: stretch;
  flex-wrap: wrap;
}
ul.project_list > li {
  width: 28rem;
  height: 17.0625rem;
  position: relative;
  perspective: 1000px;
}
ul.project_list > li:hover > div.card {
  transform: translateZ(200px) rotateY(180deg);
  transition: 0.3s ease-in-out;
}
/* ul.project_list > li[data-select="true"] > div.card {
  animation: flip linear forwards;
  animation-duration: 0.7s;
} */

/* @keyframes flip {
  0% {
    transform: translateZ(50px) rotateY(0deg);
    animation-timing-function: ease-in-out;
    .back > div {
      box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
    }
  }
  20% {
    transform: translateZ(200px) rotateY(0deg);
    animation-timing-function: ease-in;
    .back > div {
      box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
    }
  }
  50% {
    transform: translateZ(300px) rotateY(90deg);
    animation-timing-function: linear;
    .back > div {
      box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
    }
  }
  80% {
    transform: translateZ(200px) rotateY(180deg);
    animation-timing-function: ease-out;
    .back > div {
      box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
    }
  }
  100% {
    transform: translateZ(50px) rotateY(180deg);
    animation-timing-function: ease-in-out;
    .back > div {
      box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
    }
  }
} */
/* ul.project_list > li[data-select="false"] > div.card {
  animation: flip-back linear;
  animation-duration: 0.7s;
}
@keyframes flip-back {
  0% {
    transform: translateZ(50px) rotateY(180deg);
    animation-timing-function: ease-in-out;
  }
  20% {
    transform: translateZ(200px) rotateY(180deg);
    animation-timing-function: ease-in;
  }
  50% {
    transform: translateZ(300px) rotateY(90deg);
    animation-timing-function: linear;
  }
  80% {
    transform: translateZ(200px) rotateY(0deg);
    animation-timing-function: ease-out;
  }
  100% {
    transform: translateZ(0px) rotateY(0deg);
    animation-timing-function: ease-in-out;
  }
} */
div.card {
  position: absolute;
  width: 100%;
  height: 100%;
  transition: 0.3s;
  transform-style: preserve-3d;
}
/* div.card:hover {
  transform: translateZ(50px);
} */
.front,
.back {
  display: inline-flex;
  padding: 1.5rem;
  align-items: flex-start;
  position: absolute;
  backface-visibility: hidden;
}
.back {
  transform: rotateY(180deg);
}
.card_image {
  border-radius: 1.5rem;
  width: 25rem;
  height: 14.0625rem;
  aspect-ratio: 16/9;
  box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
  transition: 0.7s;
}
div.card:hover .card_image {
  box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
}
.pin {
  background-color: var(--color-other-dark);
  width: 2rem;
  height: 2rem;
  aspect-ratio: 1/1;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: var(--border-radius);
  position: absolute;
  right: 0.5rem;
  top: 0.5rem;
}
.back > div {
  background-color: var(--color-main);
  border-radius: var(--border-radius);
  display: flex;
  width: 23rem;
  height: 12.0625rem;
  aspect-ratio: 16/9;
  padding: 1rem;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  box-shadow: 0 14px 7px 0 var(--color-drop-shadow);
}
.back > section {
  padding: 0.5rem 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  align-self: stretch;
}
.back div div {
  display: flex;
  justify-content: space-between;
  align-self: stretch;
}
ul.tags {
  width: fit-content;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style-type: none;
  padding: 0;
}
li.tag {
  height: 10px;
  background-color: var(--color-bright);
  border-radius: var(--border-radius);
  display: flex;
  padding: 0.5rem 1rem;
  justify-content: center;
  align-items: center;
}
button.tag {
  background-color: var(--color-main);
  border: none;
}
.back div div a {
  background-color: var(--color-dark);
  border-radius: var(--border-radius);
  display: flex;
  padding: 0.5rem;
  justify-content: center;
  align-items: center;
}
/* footer */
.footer_placeholder {
  height: 248px;
}
footer {
  background-color: var(--color-bright);
  position: fixed;
  opacity: 0;
  bottom: 30px;
  left: 0;
  width: calc(100% - (clamp(3rem, 15vw, 7.5rem)) * 2);
  padding: 2rem clamp(3rem, 15vw, 7.5rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  z-index: 1;
  transform: translateZ(-500px) rotateX(30deg);
  perspective: 1000px;
  pointer-events: none;

  animation: reveal-footer ease-out forwards;
  animation-timeline: scroll();
  animation-range: var(--footer-animation-range-start) 100%;
}
@keyframes reveal-footer {
  to {
    pointer-events: auto;
    opacity: 1;
    bottom: 0;
    transform: translateZ(0px) rotateX(0);
  }
}
.upper_footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.upper_footer section:first-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.upper_footer section:first-child ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  text-align: center;
}
.upper_footer section:first-child ul a {
  text-decoration: none;
}
.upper_footer .time_loc {
  height: fit-content;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.upper_footer .time_loc div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0rem;
}
.upper_footer .time_loc time {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.upper_footer section:last-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.upper_footer section:last-child ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.lower_footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.divider {
  background-color: var(--color-white);
  width: 0.0625rem;
  height: 7.5rem;
}
@media (max-width: 1000px) {
  .footer_placeholder {
    height: 470px;
  }
  footer {
    gap: 4rem;
    padding: 2rem 1rem;
    width: calc(100% - (1rem) * 2);
    animation-range: var(--footer-animation-range-start) 100%;
  }
  .upper_footer {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .upper_footer section:first-child {
    align-items: flex-start;
  }
  .upper_footer section:first-child ul {
    text-align: start;
  }
  .upper_footer .time_loc {
    align-items: flex-start;
  }
  .upper_footer .time_loc div {
    align-items: flex-start;
  }
  .upper_footer section:last-child {
    align-self: stretch;
  }
  .divider {
    width: 100%;
    height: 0.0625rem;
  }
}