:root {
  --pink-50: #fdf2f8;
  --pink-100: #fce7f3;
  --pink-200: #f9d7ea;
  --pink-300: #f4b8d4;
  --pink-500: #ec4899;
  --pink-600: #db2777;
  --pink-800: #9d174d;
  --pink-900: #831843;
  --lavender-50: #faf5ff;
  --lavender-200: #ddd6fe;
  --lavender-300: #c4b5fd;
  --lavender-400: #a78bfa;
  --gold: #f8e1a8;
  --white: #ffffff;
  --card: #fffdfb;
  --ink: #6b2a48;
  --muted: #9d4a73;
  --shadow: 0 24px 60px rgba(157, 23, 77, 0.16);
  --radius: 28px;
  --font-ui: "Fredoka", "Noto Sans TC", "PingFang TC", sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", sans-serif;
  --font-letter: "Noto Serif TC", "Songti TC", serif;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--pink-900);
  background: linear-gradient(165deg, var(--pink-50) 0%, var(--lavender-50) 46%, var(--pink-100) 100%);
  overflow-x: hidden;
  touch-action: manipulation;
}

.aurora {
  position: fixed;
  inset: -20%;
  z-index: 0;
  background:
    radial-gradient(ellipse 50% 40% at 18% 20%, rgba(244, 184, 212, 0.7), transparent 60%),
    radial-gradient(ellipse 45% 38% at 82% 18%, rgba(199, 182, 242, 0.65), transparent 62%),
    radial-gradient(ellipse 42% 36% at 50% 88%, rgba(252, 231, 243, 0.9), transparent 58%),
    radial-gradient(ellipse 30% 28% at 70% 55%, rgba(248, 225, 168, 0.28), transparent 70%);
  animation: aurora-drift 14s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes aurora-drift {
  from {
    transform: translate3d(-2%, -1%, 0) scale(1);
  }
  to {
    transform: translate3d(2%, 2%, 0) scale(1.05);
  }
}

.bloom {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(circle at 12% 78%, rgba(236, 72, 153, 0.08), transparent 22%),
    radial-gradient(circle at 88% 72%, rgba(167, 139, 250, 0.1), transparent 24%);
}

.stage {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: safe center;
  justify-content: center;
  min-height: 100dvh;
  overflow-y: auto;
  padding: max(24px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

.card {
  position: relative;
  width: min(100%, 440px);
  padding: 36px 28px 32px;
  background: var(--card);
  border: 1px solid rgba(244, 184, 212, 0.55);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 22px;
  border: 1px dashed rgba(219, 39, 119, 0.16);
  pointer-events: none;
}

.progress {
  display: flex;
  justify-content: center;
  gap: 22px;
  margin: 0 0 34px;
  padding: 0;
  list-style: none;
}

.progress li {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--lavender-200);
  transition: transform 0.25s ease, background 0.25s ease;
}

.progress li.is-active,
.progress li.is-done {
  background: var(--pink-600);
  transform: scale(1.15);
}

.progress li span {
  position: absolute;
  left: 50%;
  top: 14px;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--pink-800);
  opacity: 0;
}

.progress li.is-active span {
  opacity: 0.85;
}

.kicker {
  margin: 8px 0 8px;
  text-align: center;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--lavender-400);
}

.title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 0 0 10px;
  padding: 0 4px;
  font-family: var(--font-ui);
  font-size: clamp(1.2rem, 4.4vw, 1.75rem);
  font-weight: 600;
  line-height: 1.45;
  text-align: center;
  color: var(--pink-900);
}

.lead {
  margin: 0 0 26px;
  text-align: center;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted);
}

.step {
  animation: step-in 0.48s ease;
}

.step[hidden] {
  display: none;
}

@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 56px;
}

.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1;
  min-height: 48px;
  padding: 14px 22px;
  border-radius: 999px;
  text-decoration: none;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, filter 0.2s ease;
}

.btn:focus-visible {
  outline: 3px solid var(--lavender-400);
  outline-offset: 3px;
}

.btn-yes {
  color: var(--white);
  background: linear-gradient(180deg, #f472b6 0%, var(--pink-600) 100%);
  box-shadow: 0 10px 22px rgba(219, 39, 119, 0.28);
  transform-origin: center center;
  z-index: 3;
}

.btn-yes:hover:not(:disabled) {
  transform: translateY(-1px) scale(var(--yes-scale, 1));
  filter: brightness(1.04);
}

.btn-yes:disabled {
  cursor: not-allowed;
  filter: grayscale(0.15);
  opacity: 0.45;
  box-shadow: none;
}

.btn-no {
  color: var(--pink-800);
  background: #fff;
  border: 1.5px solid var(--lavender-200);
  box-shadow: 0 6px 16px rgba(167, 139, 250, 0.16);
  z-index: 40;
}

.btn-no.is-runaway {
  margin: 0;
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

.btn-ghost {
  color: var(--pink-600);
  background: #fff;
  border: 1.5px solid var(--pink-300);
}

.btn-ghost:hover {
  background: var(--pink-50);
}

.btn-whatsapp {
  color: #fff;
  background: linear-gradient(180deg, #c084fc 0%, #a855f7 100%);
  box-shadow: 0 10px 22px rgba(147, 51, 234, 0.22);
}

.btn-whatsapp:hover {
  filter: brightness(1.04);
  transform: translateY(-1px);
}

.letter-actions {
  display: grid;
  gap: 4px;
}

.letter {
  position: relative;
  margin: 0 0 18px;
  padding: 36px 20px 22px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 252, 247, 0.98), rgba(253, 242, 248, 0.82));
  box-shadow:
    inset 0 0 0 1px rgba(219, 39, 119, 0.08),
    0 10px 24px rgba(157, 23, 77, 0.06);
  font-family: var(--font-letter);
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.95;
  color: var(--ink);
  background-image:
    linear-gradient(180deg, rgba(255, 252, 247, 0.92), rgba(253, 242, 248, 0.78)),
    repeating-linear-gradient(
      transparent,
      transparent 31px,
      rgba(219, 39, 119, 0.07) 31px,
      rgba(219, 39, 119, 0.07) 32px
    );
}

.letter::after {
  content: "";
  position: absolute;
  top: 14px;
  right: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #f9a8d4, #db2777 62%, #9d174d);
  box-shadow: 0 4px 10px rgba(157, 23, 77, 0.22);
  opacity: 0.92;
}

.letter p {
  margin: 0 0 0.85em;
}

.letter p:last-child {
  margin-bottom: 0;
}

.letter .sign {
  margin-top: 1.4em;
  text-align: right;
  color: var(--pink-600);
}

#confetti {
  position: fixed;
  inset: 0;
  z-index: 60;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

@media (min-width: 768px) {
  .card {
    width: min(100%, 480px);
    padding: 42px 40px 36px;
  }

  .title {
    font-size: 2rem;
  }
}

@media (min-width: 1280px) {
  .card {
    width: 500px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .aurora,
  .step {
    animation: none;
  }

  .btn {
    transition: none;
  }
}