:root {
  color-scheme: light;
  --bg: #fff8f7;
  --card: rgba(255, 255, 255, 0.84);
  --card-border: rgba(174, 89, 89, 0.14);
  --text: #211111;
  --muted: #7e6262;
  --accent: #d62828;
  --accent-soft: rgba(214, 40, 40, 0.12);
  --shadow: 0 24px 80px rgba(90, 36, 36, 0.12);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(214, 40, 40, 0.12), transparent 34%),
    radial-gradient(circle at bottom right, rgba(214, 40, 40, 0.08), transparent 28%),
    linear-gradient(180deg, #fffdfc 0%, var(--bg) 100%);
  overflow: hidden;
}

.page {
  position: relative;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.heart-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.background-heart {
  position: absolute;
  left: var(--left);
  bottom: var(--bottom);
  color: rgba(214, 40, 40, var(--alpha));
  font-size: var(--size);
  line-height: 1;
  transform: translate3d(0, 0, 0) rotate(var(--tilt));
  animation: floatUp var(--duration) linear forwards;
  will-change: transform, opacity;
  user-select: none;
}

.card {
  position: relative;
  z-index: 1;
  width: min(92vw, 460px);
  padding: clamp(28px, 5vw, 44px);
  border: 1px solid var(--card-border);
  border-radius: 28px;
  background: var(--card);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  text-align: center;
  animation: rise 420ms ease-out both;
}

.card--reveal {
  width: min(92vw, 500px);
}

.eyebrow {
  margin: 0 0 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-size: 0.74rem;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

h2 {
  margin-top: 10px;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.05em;
}

.subtitle,
.hint,
.closing {
  color: var(--muted);
  line-height: 1.6;
}

.subtitle {
  margin-top: 12px;
}

.pin-form {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.pin-form input,
.pin-form button {
  width: 100%;
  border-radius: 18px;
  border: 1px solid transparent;
  font: inherit;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease,
    box-shadow 160ms ease;
}

.pin-form input {
  min-height: 58px;
  padding: 0 18px;
  font-size: 1.05rem;
  letter-spacing: 0.4em;
  text-align: center;
  color: var(--text);
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(126, 98, 98, 0.2);
  outline: none;
}

.pin-form input::placeholder {
  color: rgba(126, 98, 98, 0.42);
  letter-spacing: 0.25em;
}

.pin-form input:focus {
  border-color: rgba(214, 40, 40, 0.44);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.pin-form button {
  min-height: 52px;
  font-weight: 600;
  color: white;
  background: linear-gradient(180deg, #e84141 0%, #c81d1d 100%);
  box-shadow: 0 16px 30px rgba(214, 40, 40, 0.24);
  cursor: pointer;
}

.pin-form button:hover {
  transform: translateY(-1px);
}

.pin-form button:active {
  transform: translateY(0);
}

.hint {
  margin-top: 14px;
  font-size: 0.94rem;
}

.error {
  min-height: 1.25em;
  margin-top: 10px;
  color: var(--accent);
  font-size: 0.94rem;
}

.heart {
  margin: 0 auto 18px;
  width: clamp(140px, 28vw, 210px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  color: var(--accent);
  filter: drop-shadow(0 16px 26px rgba(214, 40, 40, 0.22));
  animation: pulse 1.8s ease-in-out infinite;
}

.heart span {
  font-size: clamp(8rem, 20vw, 11rem);
  line-height: 1;
}

.love-line {
  color: var(--accent);
  font-size: 0.96rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.closing {
  margin-top: 14px;
}

.is-hidden {
  display: none !important;
}

.shake {
  animation: shake 280ms ease-in-out;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-8px);
  }
  40% {
    transform: translateX(8px);
  }
  60% {
    transform: translateX(-6px);
  }
  80% {
    transform: translateX(6px);
  }
}

@keyframes floatUp {
  0% {
    transform: translate3d(0, 0, 0) rotate(var(--tilt));
    opacity: 0;
  }
  10% {
    opacity: var(--alpha);
  }
  100% {
    transform: translate3d(var(--drift), -128vh, 0) rotate(calc(var(--tilt) + var(--spin)));
    opacity: 0;
  }
}

@media (max-width: 480px) {
  .page {
    padding: 16px;
  }

  .card {
    border-radius: 24px;
  }

  .pin-form input {
    letter-spacing: 0.28em;
  }
}