:root {
  color-scheme: light;
  --cream: #fffaf3;
  --warm-white: #fffdf9;
  --rose-50: #fdf2f3;
  --rose-100: #f7dfe3;
  --rose-300: #dca1ad;
  --wine: #6f1830;
  --wine-dark: #45101f;
  --ink: #38272b;
  --muted: #775e65;
  --shadow: 0 18px 50px rgba(78, 21, 38, 0.1);
  --radius-large: clamp(1.25rem, 4vw, 2rem);
  --page-gutter: clamp(1rem, 4vw, 2rem);
  --content-width: 47rem;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

[hidden] {
  display: none !important;
}

html {
  background: var(--cream);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 14%, rgba(220, 161, 173, 0.22), transparent 28rem),
    radial-gradient(circle at 92% 68%, rgba(111, 24, 48, 0.08), transparent 30rem),
    var(--cream);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

a {
  color: var(--wine);
}

:focus-visible {
  outline: 3px solid var(--rose-300);
  outline-offset: 4px;
}

.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;
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.ambient__glow {
  position: absolute;
  width: min(70vw, 32rem);
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(28px);
  opacity: 0.38;
}

.ambient__glow--one {
  top: -14rem;
  right: -12rem;
  background: rgba(224, 156, 168, 0.32);
}

.ambient__glow--two {
  bottom: 8%;
  left: -18rem;
  background: rgba(136, 44, 67, 0.12);
}

.floating-heart {
  position: absolute;
  color: rgba(111, 24, 48, 0.12);
  font-family: var(--serif);
  animation: drift 12s ease-in-out infinite alternate;
}

.floating-heart--one {
  top: 18%;
  right: 7%;
  font-size: 1.1rem;
}

.floating-heart--two {
  top: 57%;
  left: 5%;
  font-size: 0.75rem;
  animation-delay: -4s;
}

.floating-heart--three {
  right: 12%;
  bottom: 8%;
  font-size: 0.9rem;
  animation-delay: -8s;
}

.intro {
  position: relative;
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  place-items: center;
  padding:
    max(2.5rem, env(safe-area-inset-top))
    max(var(--page-gutter), env(safe-area-inset-right))
    max(3rem, env(safe-area-inset-bottom))
    max(var(--page-gutter), env(safe-area-inset-left));
  text-align: center;
  transition: opacity 500ms ease, transform 500ms ease;
}

.intro::before {
  position: absolute;
  inset: clamp(0.75rem, 3vw, 1.5rem);
  border: 1px solid rgba(111, 24, 48, 0.13);
  border-radius: clamp(1.5rem, 5vw, 3rem);
  content: "";
  pointer-events: none;
}

.intro.is-opening {
  opacity: 0.15;
  transform: translateY(-1.5rem);
}

.intro__content {
  position: relative;
  z-index: 1;
  width: min(100%, 45rem);
}

.intro__ornament {
  position: absolute;
  top: max(2.25rem, env(safe-area-inset-top));
  left: 50%;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--wine);
  font-size: 0.7rem;
  transform: translateX(-50%);
}

.intro__ornament span:first-child,
.intro__ornament span:last-child {
  width: clamp(2rem, 8vw, 4rem);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rose-300));
}

.intro__ornament span:last-child {
  background: linear-gradient(90deg, var(--rose-300), transparent);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--wine);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

.intro h1 {
  max-width: 13ch;
  margin: 0 auto;
  color: var(--wine-dark);
  font-family: var(--serif);
  font-size: clamp(2.2rem, 9vw, 5.5rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
  text-wrap: balance;
}

.intro__names {
  margin: clamp(1.25rem, 4vw, 2rem) 0 0;
  color: var(--wine);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 5vw, 2rem);
  font-style: italic;
}

.intro__support {
  max-width: 34rem;
  margin: 1rem auto 0;
  color: var(--muted);
  font-size: clamp(1rem, 3.8vw, 1.15rem);
  text-wrap: balance;
}

.primary-button {
  min-height: 3.35rem;
  margin-top: clamp(1.75rem, 6vw, 2.75rem);
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--wine);
  border-radius: 999px;
  color: #fffaf6;
  background: linear-gradient(135deg, #7d2139, var(--wine-dark));
  box-shadow: 0 10px 28px rgba(92, 20, 42, 0.22);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 650;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  touch-action: manipulation;
}

.primary-button:hover {
  box-shadow: 0 14px 34px rgba(92, 20, 42, 0.28);
  transform: translateY(-2px);
}

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

.noscript-note {
  margin: 1rem 0 0;
}

.intro__hint {
  position: absolute;
  bottom: max(1.35rem, env(safe-area-inset-bottom));
  margin: 0;
  color: rgba(69, 16, 31, 0.55);
  font-family: var(--serif);
  font-size: 0.78rem;
  font-style: italic;
}

.manual {
  width: min(100%, calc(var(--content-width) + (var(--page-gutter) * 2)));
  margin: 0 auto;
  padding:
    max(4rem, env(safe-area-inset-top))
    max(var(--page-gutter), env(safe-area-inset-right))
    4rem
    max(var(--page-gutter), env(safe-area-inset-left));
  scroll-margin-top: 1rem;
}

.manual:focus {
  outline: none;
}

.manual__header {
  position: sticky;
  top: max(0.75rem, env(safe-area-inset-top));
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(111, 24, 48, 0.1);
  border-radius: 1rem;
  background: rgba(255, 250, 243, 0.88);
  box-shadow: 0 8px 30px rgba(69, 16, 31, 0.07);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.manual__header .eyebrow {
  margin-bottom: 0.05rem;
  font-size: 0.62rem;
}

.manual__header h2 {
  margin: 0;
  color: var(--wine-dark);
  font-family: var(--serif);
  font-size: clamp(1.35rem, 5vw, 1.85rem);
  font-weight: 400;
  line-height: 1.1;
}

.reading-progress {
  display: grid;
  grid-template-columns: 2ch 2rem 2ch;
  align-items: center;
  color: var(--wine);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-align: center;
}

.reading-progress__divider {
  width: 1.4rem;
  height: 1px;
  margin: 0 auto;
  background: var(--rose-300);
}

.manual__list {
  display: grid;
  gap: clamp(1rem, 4vw, 1.5rem);
  padding: 0;
  margin: 0;
  list-style: none;
}

.manual-card {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid rgba(111, 24, 48, 0.1);
  border-radius: var(--radius-large);
  background: rgba(255, 253, 249, 0.9);
  box-shadow: var(--shadow);
  scroll-margin-top: 7.5rem;
  transition: opacity 600ms ease, transform 600ms ease, box-shadow 250ms ease;
}

.manual-card::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 5rem;
  height: 5rem;
  border-radius: 0 0 0 100%;
  background: linear-gradient(225deg, rgba(220, 161, 173, 0.18), transparent 70%);
  content: "";
  pointer-events: none;
}

.manual-card article {
  padding: clamp(1.4rem, 6vw, 2.35rem);
}

.manual-card__number {
  display: block;
  margin-bottom: clamp(0.7rem, 3vw, 1rem);
  color: var(--wine);
  font-family: var(--serif);
  font-size: clamp(1.65rem, 8vw, 2.5rem);
  font-style: italic;
  line-height: 1;
}

.manual-card p {
  margin: 0;
  overflow-wrap: anywhere;
  font-family: var(--serif);
  font-size: clamp(1.08rem, 4.5vw, 1.32rem);
  line-height: 1.72;
}

.manual-card.reveal-pending {
  opacity: 0;
  transform: translateY(1.25rem);
}

.manual-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.manual-card--final {
  border-color: rgba(111, 24, 48, 0.22);
  color: #fffaf6;
  background:
    radial-gradient(circle at 90% 5%, rgba(255, 221, 225, 0.2), transparent 15rem),
    linear-gradient(145deg, #7b203b, #4a1023);
  box-shadow: 0 24px 60px rgba(69, 16, 31, 0.24);
}

.manual-card--final::after {
  background: linear-gradient(225deg, rgba(255, 238, 238, 0.15), transparent 70%);
}

.manual-card--final article {
  position: relative;
  padding-block: clamp(2rem, 8vw, 3.5rem);
}

.manual-card--final .manual-card__number {
  color: #f2c7cf;
}

.final-declaration {
  display: block;
  margin-top: 1.4rem;
  color: #fff;
  font-size: clamp(1.35rem, 6.5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 1.25;
  text-shadow: 0 0 22px rgba(255, 218, 225, 0.28);
  text-wrap: balance;
}

.final-heart {
  position: absolute;
  right: clamp(1rem, 5vw, 2rem);
  bottom: clamp(0.75rem, 4vw, 1.5rem);
  color: rgba(255, 233, 236, 0.45);
  font-size: 1.3rem;
  animation: heartbeat 3.2s ease-in-out infinite;
}

.closing {
  padding:
    clamp(5rem, 15vw, 9rem)
    max(var(--page-gutter), env(safe-area-inset-right))
    max(5rem, env(safe-area-inset-bottom))
    max(var(--page-gutter), env(safe-area-inset-left));
  text-align: center;
}

.closing__heart {
  display: inline-block;
  color: var(--wine);
  font-size: 0.85rem;
}

.closing__names {
  margin: 0.6rem auto 0;
  color: var(--wine-dark);
  font-family: var(--serif);
  font-size: clamp(1.8rem, 7vw, 3.2rem);
  line-height: 1.2;
  text-wrap: balance;
}

.closing p:not(.closing__names) {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: clamp(1rem, 4vw, 1.2rem);
  font-style: italic;
}

.back-to-top {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  margin-top: 2rem;
  padding: 0.4rem 0.6rem;
  font-size: 0.84rem;
  font-weight: 650;
  text-underline-offset: 0.25rem;
}

@media (min-width: 48rem) {
  .manual {
    padding-top: 6rem;
  }

  .manual__header {
    margin-bottom: 2rem;
    padding: 1rem 1.25rem;
  }

  .manual-card:hover {
    box-shadow: 0 22px 56px rgba(78, 21, 38, 0.14);
  }
}

@media (max-height: 36rem) and (orientation: landscape) {
  .intro {
    min-height: 31rem;
    padding-block: max(4rem, env(safe-area-inset-top)) max(3rem, env(safe-area-inset-bottom));
  }

  .intro__hint {
    display: none;
  }
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0) rotate(-5deg);
  }
  to {
    transform: translate3d(0.65rem, -2rem, 0) rotate(7deg);
  }
}

@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  8% {
    transform: scale(1.13);
  }
  16% {
    transform: scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .floating-heart {
    display: none;
  }

  .manual-card.reveal-pending {
    opacity: 1;
    transform: none;
  }
}