:root {
  --bg-a: #ff7f50;
  --bg-b: #ffd166;
  --bg-c: #06d6a0;
  --bg-d: #118ab2;
  --text-main: #fcfcff;
  --text-dark: #1d1d2a;
  --panel-bg: rgba(15, 20, 48, 0.74);
  --panel-border: rgba(255, 255, 255, 0.28);
  --accent: #ffec99;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  font-family: "M PLUS Rounded 1c", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 255, 255, 0.45), transparent 35%),
    linear-gradient(125deg, var(--bg-a), var(--bg-b), var(--bg-c), var(--bg-d));
  background-size: 130% 130%;
  animation: wave 12s ease-in-out infinite alternate;
}

body.is-celebrating {
  touch-action: none;
}

@keyframes wave {
  from {
    background-position: 0% 30%;
  }
  to {
    background-position: 100% 70%;
  }
}

#app {
  width: 100%;
  height: 100%;
}

.screen {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}

.hidden {
  display: none;
}

.panel {
  width: min(760px, 100%);
  padding: 28px;
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  background: var(--panel-bg);
  backdrop-filter: blur(8px);
  box-shadow: 0 18px 40px rgba(16, 10, 42, 0.35);
}

h1,
h2 {
  margin: 0;
  font-family: "Yusei Magic", "M PLUS Rounded 1c", sans-serif;
  letter-spacing: 0.03em;
}

h1 {
  margin-top: 8px;
  font-size: clamp(1.8rem, 3.2vw, 2.8rem);
}

h2 {
  font-size: clamp(2.2rem, 7vw, 5.8rem);
  text-align: center;
  text-shadow: 0 6px 12px rgba(0, 0, 0, 0.25);
}

.eyebrow {
  margin: 0;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--accent);
}

.description {
  margin: 14px 0 20px;
  line-height: 1.6;
}

.label {
  display: inline-block;
  margin-top: 12px;
  margin-bottom: 8px;
  font-weight: 700;
}

textarea,
input[type="text"] {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.16);
  color: var(--text-main);
  padding: 10px 12px;
  font: inherit;
}

textarea::placeholder,
input[type="text"]::placeholder {
  color: rgba(255, 255, 255, 0.8);
}

textarea {
  resize: vertical;
  min-height: 84px;
  max-height: 160px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  color: var(--text-main);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.18);
  min-height: 42px;
  padding: 0 16px;
  margin-top: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.16s ease, background-color 0.16s ease;
}

.button:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.28);
}

.button.primary {
  background: rgba(255, 236, 153, 0.25);
  border-color: rgba(255, 236, 153, 0.6);
}

.button.ghost {
  width: fit-content;
}

.urlRow {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

#celebration {
  position: fixed;
  inset: 0;
  isolation: isolate;
}

.celebrationContent {
  position: relative;
  z-index: 2;
  width: min(1100px, 95%);
}

#celebration .description,
#celebration .eyebrow {
  text-align: center;
}

#confettiLayer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 1;
}

.confetti {
  position: absolute;
  top: -12%;
  left: calc(var(--left) * 1%);
  width: calc(var(--size) * 1px);
  height: calc(var(--size) * 0.48px);
  border-radius: 999px;
  opacity: 0.9;
  background: hsl(var(--hue) 95% 68%);
  transform: rotate(calc(var(--spin) * 1deg));
  animation: fall linear infinite;
  animation-duration: calc(var(--duration) * 1s);
  animation-delay: calc(var(--delay) * 1s);
}

.confetti.star {
  width: calc(var(--size) * 0.95px);
  height: calc(var(--size) * 0.95px);
  border-radius: 4px;
  transform: rotate(calc(var(--spin) * 1deg));
}

@keyframes fall {
  0% {
    transform: translate3d(0, 0, 0) rotate(calc(var(--spin) * 1deg));
  }
  100% {
    transform: translate3d(calc(var(--drift) * 1px), 120vh, 0) rotate(calc((var(--spin) + 400) * 1deg));
  }
}

@media (max-width: 640px) {
  .panel {
    padding: 22px 18px;
    border-radius: 16px;
  }

  .description {
    margin-bottom: 14px;
  }

  textarea {
    min-height: 74px;
  }
}