:root {
  --bg: #0d0d12;
  --panel: #16161f;
  --fg: #f2e9e4;
  --muted: #7d7a8c;
  --pink: #ff5c8a;
  --green: #5cffb0;
  --px: 4px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image: radial-gradient(#ffffff0d 1px, transparent 1px);
  background-size: 12px 12px;
  color: var(--fg);
  font-family: "VT323", monospace;
  font-size: 22px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 48px 16px;
}

main {
  width: 100%;
  max-width: 480px;
}

h1,
h2,
button,
label {
  font-family: "Press Start 2P", monospace;
  text-transform: lowercase;
}

h1 {
  font-size: 18px;
  color: var(--pink);
  text-align: center;
  margin: 0 0 32px;
  text-shadow: var(--px) var(--px) 0 #000;
}

h2 {
  font-size: 12px;
  margin: 32px 0 12px;
  color: var(--muted);
}

label {
  display: block;
  font-size: 10px;
  margin-bottom: 10px;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  padding: 24px;
  box-shadow:
    0 calc(-1 * var(--px)) 0 0 var(--fg),
    0 var(--px) 0 0 var(--fg),
    calc(-1 * var(--px)) 0 0 0 var(--fg),
    var(--px) 0 0 0 var(--fg),
    calc(var(--px) * 2) calc(var(--px) * 2) 0 0 #000;
}

input,
textarea {
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  border: none;
  outline: var(--px) solid var(--muted);
  padding: 10px;
  font-family: inherit;
  font-size: 24px;
  resize: none;
  margin-bottom: 16px;
}

input:focus,
textarea:focus {
  outline-color: var(--pink);
}

button {
  background: var(--pink);
  color: var(--bg);
  border: none;
  padding: 12px 16px;
  font-size: 10px;
  cursor: pointer;
  box-shadow: var(--px) var(--px) 0 #000;
}

button:active:not(:disabled) {
  transform: translate(var(--px), var(--px));
  box-shadow: none;
}

button:disabled {
  background: var(--muted);
  cursor: not-allowed;
}

button.link {
  background: none;
  box-shadow: none;
  color: var(--muted);
  padding: 0;
  margin-top: 24px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.muted {
  color: var(--muted);
}

.error {
  color: var(--pink);
}

#status {
  min-height: 1.2em;
  margin: 12px 0 0;
}

#history {
  list-style: none;
  padding: 0;
  margin: 0;
}

#history li {
  border-left: var(--px) solid var(--muted);
  padding: 4px 0 4px 12px;
  margin-bottom: 14px;
}

#history li.opened {
  border-color: var(--green);
}

#history .text {
  white-space: pre-wrap;
  word-break: break-word;
}

#history .meta {
  font-size: 18px;
  color: var(--muted);
}

#history .meta .opened {
  color: var(--green);
}

#received {
  list-style: none;
  padding: 0;
  margin: 0;
}

#received li {
  border-left: var(--px) solid var(--pink);
  padding: 2px 0 2px 12px;
  margin-bottom: 8px;
}

#received .heart {
  color: var(--pink);
}

#heart-popup {
  position: fixed;
  inset: 0;
  background: #0d0d12cc;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

#heart-popup[hidden] {
  display: none;
}

.heart-card {
  text-align: center;
  max-width: 320px;
}

#heart-title {
  font-family: "Press Start 2P", monospace;
  font-size: 12px;
  color: var(--pink);
  margin: 20px 0 8px;
}

#heart-time {
  margin: 0 0 20px;
}

.pixel-heart {
  display: inline-grid;
  grid-template-columns: repeat(7, 14px);
  grid-auto-rows: 14px;
  gap: 2px;
  animation: beat 1s steps(2) infinite;
}

.pixel-heart span.on {
  background: var(--pink);
}

@keyframes beat {
  50% {
    transform: scale(1.15);
  }
}