* {
  box-sizing: border-box;
}

:root {
  --ink: #20275b;
  --sky: #79d9f7;
  --sky-light: #bceefa;
  --grass: #a9dc55;
  --card: #fffdfa;
}

html,
body {
  margin: 0;
  width: 100%;
  min-height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  font-family: "Comic Sans MS", "Trebuchet MS", "Avenir Next", system-ui, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--sky-light) 0%, var(--sky) 54%, #b9e75c 100%);
}

button {
  font: inherit;
}

.app {
  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  padding: max(18px, env(safe-area-inset-top)) 14px max(14px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
}

/* Header */

.header {
  position: relative;
  width: min(100%, 600px);
  height: 104px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header h1 {
  position: relative;
  z-index: 2;
  margin: 0;
  font-size: clamp(2.5rem, 10vw, 4rem);
  font-weight: 800;
  letter-spacing: -2px;
  text-shadow: 0 3px 0 rgba(255,255,255,.35);
}

.sun {
  position: absolute;
  left: 4%;
  top: 15px;
  font-size: 3.2rem;
  color: #ffd13d;
  line-height: 1;
  filter: drop-shadow(0 4px 3px rgba(0,0,0,.08));
}

.cloud {
  position: absolute;
  width: 74px;
  height: 28px;
  border-radius: 30px;
  background: rgba(255,255,255,.82);
  box-shadow:
    20px -13px 0 4px rgba(255,255,255,.82),
    42px -5px 0 1px rgba(255,255,255,.82);
}

.cloud-one {
  right: 2%;
  top: 28px;
  transform: scale(.8);
}

.cloud-two {
  left: -8px;
  top: 70px;
  transform: scale(.6);
  opacity: .75;
}

/* Set selector */

.set-selector {
  position: relative;
  z-index: 20;
  width: min(100%, 500px);
  height: 58px;
  padding: 0 20px;
  border: 0;
  border-radius: 30px;
  background: rgba(255,255,255,.92);
  color: var(--ink);
  box-shadow: 0 8px 20px rgba(45, 91, 112, .13);
  display: flex;
  align-items: center;
  gap: 13px;
  cursor: pointer;
  font-size: 1.2rem;
  font-weight: 750;
  text-align: left;
  flex-shrink: 0;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.set-selector:active {
  transform: scale(.985);
}

.books {
  font-size: 1.65rem;
  line-height: 1;
}

.chevron {
  width: 12px;
  height: 12px;
  margin-left: auto;
  border-right: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
  transform: rotate(45deg) translateY(-3px);
  transition: transform 160ms ease;
}

.set-selector[aria-expanded="true"] .chevron {
  transform: rotate(225deg) translate(-2px, -2px);
}

.set-menu {
  position: absolute;
  z-index: 30;
  top: 180px;
  width: min(calc(100% - 28px), 500px);
  padding: 8px;
  border-radius: 20px;
  background: white;
  box-shadow: 0 15px 35px rgba(32, 39, 91, .18);
}

.set-option {
  width: 100%;
  padding: 14px 16px;
  border: 0;
  border-radius: 14px;
  background: transparent;
  color: var(--ink);
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
}

.set-option:hover,
.set-option.selected {
  background: #eefaff;
}

.hidden {
  display: none;
}

/* Flashcard */

.card {
  position: relative;
  z-index: 5;
  width: min(100%, 560px);
  flex: 1;
  min-height: 0;
  margin: 22px 0 8px;
  padding: 24px 22px;
  border: 5px solid rgba(255,255,255,.78);
  border-radius: 34px;
  background: var(--card);
  box-shadow:
    0 15px 35px rgba(41, 76, 91, .18),
    inset 0 0 0 2px rgba(230, 230, 225, .5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  overflow: hidden;
  touch-action: pan-y;
  user-select: none;
  cursor: pointer;
  transition: transform 180ms cubic-bezier(.25,.8,.3,1);
}

.sound {
    font-weight: bold;
    position: relative;
}

/* .sound { */
/*   margin-top: 3vh; */
/*   font-size: clamp(5rem, 22vw, 9rem); */
/*   font-weight: 800; */
/*   line-height: .9; */
/*   letter-spacing: -5px; */
/* } */

.picture {
  flex: 1;
  width: 100%;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(2px);
}

.picture img {
  display: block;
  width: min(78%, 360px);
  height: min(38vh, 300px);
  object-fit: contain;
  -webkit-user-drag: none;
  user-select: none;
  pointer-events: none;
}

.word {
  margin: 8px 0 2vh;
  font-size: clamp(3rem, 12vw, 5rem);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1;
}

.word .focus {
  color: #ef4b4b;
}

/* Ground decoration */

.ground {
  position: absolute;
  z-index: 1;
  left: -10%;
  right: -10%;
  bottom: -30px;
  height: 105px;
  pointer-events: none;
}

.hill {
  position: absolute;
  bottom: 0;
  width: 65%;
  height: 80px;
  border-radius: 50% 50% 0 0;
  background: rgba(157, 213, 72, .72);
}

.hill-one { left: -10%; }
.hill-two {
  right: -8%;
  width: 70%;
  height: 60px;
  background: rgba(132, 199, 62, .68);
}

.flower,
.leaf {
  position: absolute;
}

.flower {
  color: white;
  font-size: 1.6rem;
  text-shadow: 0 1px #e7a929;
}

.flower-one { left: 23%; bottom: 35px; }
.flower-two { right: 24%; bottom: 25px; }

.leaf {
  width: 24px;
  height: 12px;
  border-radius: 100% 0 100% 0;
  background: #54a64e;
}

.leaf-one { left: 10%; bottom: 22px; transform: rotate(25deg); }
.leaf-two { right: 10%; bottom: 20px; transform: rotate(-25deg); }

/* Small screens */

@media (max-width: 480px) {
  .header {
    height: 88px;
  }

  .header h1 {
    font-size: 2.65rem;
  }

  .sun {
    left: 1%;
    top: 7px;
    font-size: 2.5rem;
  }

  .set-selector {
    height: 52px;
    font-size: 1.08rem;
  }

  .set-menu {
    top: 153px;
  }

  .card {
    margin-top: 16px;
    border-radius: 28px;
  }

  .sound {
    margin-top: 2vh;
  }

  .word {
    margin-bottom: 2vh;
  }
}