:root {
  --bgc-black: #1b1d21;
  --bgc-gold: #ccad6c;
  --time-appear: 0.6s;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
}

html {
  font-size: 0.5vmax; /* font-size: 10px; */ /* 8px */
}

body {
  width: 100%;
  height: 100vh;
  background-image: url("../img/bg-stars.gif");
  background-position: center;
  position: relative;
  overflow: hidden;
  cursor: url("../img/cursor.svg"), auto;
}

body::after {
  content: "";
  width: 100%;
  height: 100%;
  background-color: var(--bgc-black);
  mix-blend-mode: screen;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  opacity: 0;
}

body::before {
  content: "";
  width: 100%;
  height: 100%;
  background-image: url("../img/bg-stars.png");
  background-position: center;
  background-size: cover;
  mix-blend-mode: screen;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0.8;
}

main {
  transform-box: fill-box;
  transition: translate 1s, scale 1s;
  z-index: 9;
}

main,
section {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

section {
  position: absolute;
}

.show_section {
  animation: show_section 2s linear forwards;
}

@keyframes show_section {
  to {
    opacity: 0;
    pointer-events: none;
  }
}

.btn_nav {
  padding-right: 3rem;
  display: flex;
  gap: 2rem;
  position: absolute;
  bottom: 0;
  right: 0;
  z-index: 9;
}

#btn_cfullscreen::before {
  content: "close ";
}

#btn_cfullscreen.cfull--open::before {
  content: "open ";
}

#btn_quit,
#btn_cfullscreen {
  padding: 1.6rem 0;
  border: none;
  background-color: transparent;
  font-size: 1.2rem;
  filter: drop-shadow(0px 0px 1px black) drop-shadow(0px 0px 3px black)
    drop-shadow(0px 0px 10px black);
}

#btn_quit:hover,
#btn_cfullscreen:hover {
  color: white;
}

section#intro {
  width: 100%;
  height: 100%;
  background-color: black;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 9999;
  color: white;
  font-size: 2rem;
  font-family: "Raleway", sans-serif;
}

section#intro .content {
  width: 80vw;
  height: 80vh;
  padding: 0 40rem;
  border: 1px solid var(--bgc-gold);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

section#intro img {
  width: 5rem;
  height: 5rem;
  margin-bottom: 4rem;
}

section#intro .text {
  margin-bottom: 7rem;
}

section#intro p {
  line-height: 3rem;
  margin-bottom: 1rem;
}

section#intro button,
button {
  padding: 1.6rem 6rem;
  border: 1px solid var(--bgc-gold);
  background-color: black;
  font-family: "Raleway", sans-serif;
  font-size: 1.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  white-space: nowrap;
  color: var(--bgc-gold);
  cursor: url("../img/cursor-hov.svg"), auto;
  transition: 0.1s;
}

section#intro button:hover,
button:hover {
  border: 1px solid white;
  color: white;
}

/*=== COSMERE SCREEN ===*/

.logo_cosmere {
  width: 27.8rem;
  height: 27.8rem;
  position: absolute;
}

.logo_cosmere img {
  width: 100%;
  height: auto;
}

.logo_cosmere__rings {
  display: flex;
  justify-content: center;
  align-items: center;
}

.ring {
  border: 0.1rem solid var(--bgc-gold);
  border-radius: 100%;
  position: absolute;
  animation: appear var(--time-appear) ease-in-out forwards;
  opacity: 0.2;
  transition: opacity 1s;
}

@keyframes appear {
  0% {
    width: 0rem;
    height: 0rem;
  }
}

.logo_cosmere__rings .ring:nth-child(9) {
  width: 47rem;
  height: 47rem;
}

.logo_cosmere__rings .ring:nth-child(8) {
  width: 69.8rem;
  height: 69.8rem; /* animation-delay: calc(var(--time-appear) / 6); */
}

.logo_cosmere__rings .ring:nth-child(7) {
  width: 91.8rem;
  height: 91.8rem; /* animation-delay: calc((var(--time-appear) / 6) * 2); */
}

.logo_cosmere__rings .ring:nth-child(6) {
  width: 116.8rem;
  height: 116.8rem; /* animation-delay: calc((var(--time-appear) / 6) * 3); */
}

.logo_cosmere__rings .ring:nth-child(5) {
  width: 133.2rem;
  height: 133.2rem; /* animation-delay: calc((var(--time-appear) / 6) * 4); */
}

.logo_cosmere__rings .ring:nth-child(4) {
  width: 142rem;
  height: 142rem; /* animation-delay: calc((var(--time-appear) / 6) * 5); */
}

.logo_cosmere__rings .ring:nth-child(3) {
  width: 165.6rem;
  height: 165.6rem; /* animation-delay: calc((var(--time-appear) / 6) * 6); */
}

.logo_cosmere__rings .ring:nth-child(2) {
  width: 189.8rem;
  height: 189.8rem; /* animation-delay: calc((var(--time-appear) / 6) * 7); */
}

.logo_cosmere__rings .ring:nth-child(1) {
  width: 221.4rem;
  height: 221.4rem; /* animation-delay: calc((var(--time-appear) / 6) * 7); */
}

#main.main--zoom-in .logo_cosmere__rings .ring {
  opacity: 0;
}

.asteroid_belt,
.asteroids {
  border: none;
  background-image: url("../img/asteroid_belt.svg");
  background-position: center;
  background-size: cover;
  animation: rotation 180s linear infinite;
}

@keyframes rotation {
  to {
    rotate: 360deg;
  }
}

.asteroids {
  background-image: url("../img/asteroids.svg");
}

/*=== GRID ===*/

.grid {
  background-image: url("../img/cell.svg");
  background-position: center;
  background-size: 22.5rem 22.5rem;
  opacity: 0.1;
  transition: opacity 0.4s;
}

.main--zoom-in .grid {
  opacity: 0;
}

/*=== CONSTELLATIONS ===*/

.constellation {
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  position: absolute;
  pointer-events: none;
  transition: opacity 0.4s;
  transform-origin: center;
}

.constellation svg {
  transition: translate 1s, scale 0.4s;
}

.constellation svg .line {
  opacity: 0.8;
}

.constellation svg .star {
  /* fill: var(--bgc-gold); */
  filter: drop-shadow(0 0 1rem /* var(--bgc-gold) */ white) blur(0.15rem);
}

.main--zoom-in .constellation {
  opacity: 0;
}

/*=== SYSTEMS ===*/

.systems {
  z-index: 9;
}

.system {
  width: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
}

.system__content {
  display: flex;
  justify-content: center;
  align-items: center;
  transform-origin: center;
  pointer-events: none;
}

.main--zoom-in .system__content {
  pointer-events: initial;
}

svg {
  width: 122rem;
  height: 122rem;
}

#nalthian_system,
.system__rings_content {
  transform-origin: center !important;
}

.system__rings_content {
  transition: translate 1s, scale 0.2s;
}

.main--zoom-in .system__rings_content {
  scale: 0.25;
  translate: 0 calc(((100% / 4) * 0.25));
}

.system__ring_content {
  transition: opacity 0.2s;
  opacity: 0;
  pointer-events: none;
}

.main--zoom-in .system .system__ring_content {
  pointer-events: initial;
  opacity: 1;
}

.system__ring {
  stroke: white !important;
  pointer-events: none;
  opacity: 0.2;
  position: absolute;
  z-index: -1;
}

.system__ring.comet_belt,
.system__ring.asteroid_belt,
.system__ring_content.comet_belt {
  pointer-events: none !important;
}

.main--zoom-in .system__ring.comet_belt,
.main--zoom-in .system__ring.asteroid_belt,
.main--zoom-in .system__ring_content.comet_belt {
  animation: rotation 180s linear infinite;
}

.system__ring.comet_belt {
  transform-origin: center;
}

.system__ring.asteroid_belt,
.system__ring_content.comet_belt {
  transform-origin: center;
  transform-box: fill-box;
}

.system__ring.asteroid_belt * {
  stroke: none !important;
  fill: white !important;
}

.system__sun {
  r: 1.2rem;
  fill: white;
  filter: drop-shadow(0 0 1rem white)
    drop-shadow(0 0 2rem rgba(255, 255, 255, 0)) blur(0.1rem); /*.05*/
  transition: r 1s, translate 1s, scale 1s, filter 0.2s;
  transform-origin: center;
  cursor: url("../img/cursor-hov.svg"), auto;
}

.system__sun--hover {
  filter: drop-shadow(0 0 1rem white) drop-shadow(0 0 2rem white) blur(0.1rem);
}

.system__star {
  fill: white;
}

.system__planet_content {
  transition: scale 0.2s;
  transform-box: fill-box;
  transform-origin: center;
}

.system__planet_content:hover {
  scale: 2;
  filter: drop-shadow(0 0 1rem var(--bgc-black));
  z-index: 9;
}

.system__planet {
  position: absolute;
  z-index: 9;
  fill: var(--bgc-gold);
  transition: scale 0.2s;
  cursor: url("../img/cursor-hov.svg"), auto;
}

.system__planet_ring {
  stroke: var(--bgc-gold);
}

.system__unplanet {
  fill: var(--bgc-black);
  stroke: var(--bgc-gold);
}

.system__moon {
  fill: var(--bgc-gold);
}

.system__bg {
  stroke: none;
  fill: rgba(255, 255, 255, 0);
}

.system__sun_content {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
}

.system__sun_content .sun {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 100%;
  position: absolute;
}

.main--zoom-in .system__sun_content {
  pointer-events: none;
}

.main--zoom-in .system__sun_content .sun {
  opacity: 0;
}

.system__sun_content h4 {
  filter: drop-shadow(0 0 1rem var(--bgc-black));
  translate: 0 -3rem;
  font-family: "Raleway", sans-serif;
  font-size: 1.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  white-space: nowrap;
  color: var(--bgc-gold);
  pointer-events: none;
  transition: opacity 3s, translate 2s;
}

.main--zoom-in .system .system__sun_content h4 {
  transition: opacity 0.2s, translate 0.2s;
  /* translate: 0; */
  opacity: 0;
}

.main--zoom-in .system {
  opacity: 0;
  pointer-events: none;
  display: none;
}

/*=== INFO ===*/

#info {
  width: 50%;
  height: 100vh;
  padding: 0 14.4rem;
  background-color: rgba(0, 0, 0, 0.42);
  display: initial;
  overflow: hidden;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 99;
  translate: 100% 0%;
  transition: opacity 1s, translate 1s;
  /* pointer-events: none; */
  opacity: 0;
}

#info.info--on {
  translate: 0% 0%;
  opacity: 1;
}

.info_content {
  width: 100%;
  height: 100vh;
  padding-bottom: 19rem;
  overflow: auto;
}

.info_btn--close {
  width: 3.8rem;
  height: 3.8rem;
  position: absolute;
  top: 3rem;
  right: 3rem;
  transition: opacity 0.2s;
}

.info_btn--close:hover {
  opacity: 0.4;
  cursor: url("../img/cursor-hov.svg"), auto;
}

.info_btn--close::before,
.info_btn--close::after {
  content: "";
  width: 100%;
  height: 0.2rem;
  background-color: var(--bgc-gold);
  display: inline-block;
  position: absolute;
}

.info_btn--close::before {
  transform: translateY(1.5rem) rotate(-45deg);
}

.info_btn--close::after {
  transform: translateY(1.5rem) rotate(45deg);
}

.info__main_data {
  height: 100vh;
  display: grid;
  grid-template-rows: 1fr auto auto auto auto;
  justify-content: center;
  align-items: center;
}

.main_data__logo_system {
  width: 100%;
  height: 32rem;
  margin-top: 5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.main_data__logo_system::before {
  content: "";
  width: 50rem;
  height: 50rem;
  border-radius: 100%;
  background: radial-gradient(
    closest-side,
    rgba(235, 229, 169, 1),
    rgba(235, 229, 169, 0)
  );
  position: absolute;
  z-index: -1;
  opacity: 0.1;
}

.main_data__logo_system img {
  width: 32rem;
  height: 32rem;
}

.main_data__head_text {
  font-family: "Raleway", sans-serif;
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: 0.5rem;
  text-transform: uppercase;
  text-align: center;
  color: var(--bgc-gold);
}

.main_data__space_line,
.main_data__arrow {
  width: 15.6rem;
  height: 0.6rem;
  margin: 0 auto;
  margin-top: 2.4rem;
  margin-bottom: 3.3rem;
  background-image: url("../img/space_line.svg");
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
}

.main_data__description_text {
  margin-bottom: 8.4rem;
  font-family: "Roboto", sans-serif;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.15rem;
  line-height: 3rem;
  text-align: center;
  color: white;
}

.main_data__arrow {
  width: 5.5em;
  height: 1.2em;
  background-image: url("../img/arrow.svg");
  margin-bottom: 10.3rem;
  animation: flicker 2s linear infinite;
}

@keyframes flicker {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
  100% {
    opacity: 1;
  }
}

.info__secondary_data {
  margin-top: 10rem;
}

.head_text {
  /* margin-bottom: 2.4rem; */
  font-family: "Raleway", sans-serif;
  font-size: 2.4rem;
  font-weight: 500;
  letter-spacing: 0.1rem;
  text-transform: uppercase;
  color: var(--bgc-gold);
}

.paragraph_text {
  margin-top: 2.4rem;
  font-family: "Roboto", sans-serif;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.15rem;
  line-height: 3rem;
  color: white;
}

.paragraph_text span {
  font-weight: 500;
}