*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

body {
  background: radial-gradient(circle at top, #1f2937 0, #020617 55%, #000 100%);
  color: #e5e7eb;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.card {
  position: relative;
  width: 100%;
  max-width: 420px;
  padding: 2.25rem 2rem 2.5rem;
  border-radius: 1.5rem;
  background: radial-gradient(circle at top left, #111827, #020617 55%, #020617);
  box-shadow:
    0 24px 60px rgba(15, 23, 42, 0.95),
    0 0 0 1px rgba(148, 163, 184, 0.16);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, #4ade80, #38bdf8, #a855f7);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  pointer-events: none;
}

.card-header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.app-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  letter-spacing: 0.03em;
  background: linear-gradient(120deg, #4ade80, #38bdf8, #a855f7);
  -webkit-background-clip: text;
  color: transparent;
}

.app-subtitle {
  margin: 0;
  font-size: 0.9rem;
  color: #9ca3af;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.field-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: #d1d5db;
}

.text-input {
  border-radius: 999px;
  border: 1px solid rgba(156, 163, 175, 0.55);
  background: rgba(15, 23, 42, 0.85);
  color: #e5e7eb;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background-color 160ms ease,
    transform 120ms ease;
}

.text-input::placeholder {
  color: #6b7280;
}

.text-input:focus {
  border-color: #38bdf8;
  background: rgba(15, 23, 42, 0.98);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.6);
  transform: translateY(-1px);
}

.primary-button {
  margin-top: 0.25rem;
  border-radius: 999px;
  border: none;
  padding: 0.75rem 1.25rem;
  background: linear-gradient(120deg, #4ade80, #22c55e);
  color: #022c22;
  font-weight: 600;
  letter-spacing: 0.03em;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  box-shadow:
    0 12px 30px rgba(34, 197, 94, 0.35),
    0 0 0 1px rgba(21, 128, 61, 0.4);
  transition:
    transform 130ms ease,
    box-shadow 130ms ease,
    filter 130ms ease;
}

.primary-button:hover {
  transform: translateY(-1px) scale(1.01);
  filter: brightness(1.03);
  box-shadow:
    0 18px 40px rgba(34, 197, 94, 0.45),
    0 0 0 1px rgba(21, 128, 61, 0.55);
}

.primary-button:active {
  transform: translateY(0) scale(0.985);
  box-shadow:
    0 4px 12px rgba(34, 197, 94, 0.35),
    0 0 0 1px rgba(21, 128, 61, 0.55);
}

.primary-button:focus-visible {
  outline: 2px solid #38bdf8;
  outline-offset: 3px;
}

.greeting-output {
  min-height: 1.25rem;
  margin: 0.25rem 0 0;
  font-size: 1rem;
  font-weight: 500;
  color: #e5e7eb;
}

.greeting-output span.name {
  color: #4ade80;
}

#animation-layer {
  pointer-events: none;
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.page,
.card {
  position: relative;
  z-index: 1;
}

.confetti-container {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 8px;
  height: 14px;
  border-radius: 2px;
  background: #f97316;
  opacity: 0;
  animation: confetti-fall 900ms ease-out forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translate3d(0, -20%, 0) rotateZ(0deg);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: translate3d(var(--confetti-x, 0px), 120vh, 0)
      rotateZ(var(--confetti-rotation, 180deg));
    opacity: 0;
  }
}

.popper-container {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}

.popper-particle {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 20%, #ffffff, var(--popper-color));
  opacity: 0;
  transform: translate3d(0, 0, 0) scale(0.2);
  animation: popper-burst 700ms ease-out forwards;
}

@keyframes popper-burst {
  0% {
    opacity: 0;
    transform: translate3d(0, 0, 0) scale(0.1);
  }
  20% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate3d(var(--popper-x, 0px), var(--popper-y, 0px), 0)
      scale(0.9);
  }
}

.glow-burst {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle at center, #4ade80 0, transparent 60%);
  opacity: 0;
  transform: scale(0.5);
  filter: blur(40px);
  mix-blend-mode: screen;
  animation: glow-pulse 800ms ease-out forwards;
}

@keyframes glow-pulse {
  0% {
    opacity: 0;
    transform: scale(0.4);
  }
  30% {
    opacity: 0.85;
    transform: scale(1.02);
  }
  100% {
    opacity: 0;
    transform: scale(1.4);
  }
}

@media (max-width: 480px) {
  .card {
    padding: 1.75rem 1.5rem 2rem;
  }

  .app-title {
    font-size: 1.5rem;
  }
}