:root {
  color-scheme: light;
  --paper: #f5f6f1;
  --surface: #ffffff;
  --ink: #252d29;
  --muted: #5f6962;
  --sage: #849681;
  --olive: #566551;
  --deep-olive: #36483b;
  --autumn: #c37b50;
  --sun: #d4b86a;
  --rule: #d1d7ce;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.6 ui-sans-serif, system-ui, "Microsoft YaHei", sans-serif;
}

button,
a { font: inherit; }

button { color: inherit; }

.site-header {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 24px 0 8px;
  color: var(--olive);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-shell {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 48px;
  align-items: center;
  padding: 56px 0 72px;
}

.hero-copy-block { position: relative; z-index: 1; }

.hero-date,
.section-label,
.letter-label {
  margin: 0 0 14px;
  color: var(--autumn);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.memories h2,
.letter-block h2,
.garden h2 {
  margin: 0;
  color: var(--ink);
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.2;
}

.hero h1 { max-width: 11em; font-size: clamp(2.25rem, 5vw, 4.6rem); }
.hero-copy { max-width: 30rem; margin: 24px 0 0; color: var(--muted); font-size: 1.1rem; }

.hero-jump {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 32px;
  color: var(--deep-olive);
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: color 160ms ease, gap 160ms ease;
}

.hero-jump:hover { gap: 14px; color: var(--autumn); }

.botanical-mark {
  position: absolute;
  inset: 0 0 auto auto;
  width: 96px;
  height: 128px;
  color: var(--sage);
  opacity: 0.55;
  pointer-events: none;
}

.photo-open {
  display: block;
  width: 100%;
  min-width: 44px;
  min-height: 44px;
  border: 0;
  padding: 0;
  color: inherit;
  background: transparent;
  cursor: zoom-in;
}

.photo-open img { display: block; width: 100%; height: auto; }
.hero-photo { position: relative; z-index: 1; overflow: hidden; border-radius: 2px; }
.hero-photo img { max-height: 620px; object-fit: cover; transition: transform 500ms cubic-bezier(.2,.7,.2,1); }
.hero-photo:hover img,
.hero-photo:focus-visible img { transform: scale(1.025); }

.photo-caption {
  position: absolute;
  right: 16px;
  bottom: 14px;
  left: 16px;
  display: flex;
  justify-content: space-between;
  color: white;
  font-size: 0.82rem;
  font-weight: 650;
  text-shadow: 0 1px 12px rgb(0 0 0 / 0.55);
  pointer-events: none;
}

.letter-block {
  max-width: 760px;
  margin: 0 auto 100px;
  padding: 28px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

#open-letter {
  min-width: 44px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--olive);
  border-radius: 3px;
  color: var(--surface);
  background: var(--olive);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

#open-letter span { display: inline-block; margin-left: 8px; transition: transform 260ms ease; }
#open-letter:hover { color: var(--olive); background: transparent; }
#open-letter[aria-expanded="true"] span { transform: rotate(45deg); }

#birthday-letter { overflow: hidden; }
#birthday-letter[hidden] { display: none; }
#birthday-letter.is-visible { animation: letter-in 460ms cubic-bezier(.2,.8,.2,1) both; }
#birthday-letter.is-closing { animation: letter-out 220ms ease both; }
.letter-paper { max-width: 650px; padding: 28px 0 4px; }
.letter-paper h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
#birthday-letter p:not(.letter-label) { max-width: 65ch; margin: 18px 0 0; color: var(--muted); }

.garden {
  display: grid;
  grid-template-columns: minmax(210px, 0.62fr) minmax(0, 1.38fr);
  gap: 48px;
  align-items: center;
  margin-bottom: 112px;
}

.garden-intro h2 { font-size: clamp(1.8rem, 3vw, 2.7rem); }
.garden-intro > p:not(.section-label):not(.garden-message):not(.garden-progress) { max-width: 28rem; margin: 20px 0 0; color: var(--muted); }
.garden-message { min-height: 3.2em; margin: 30px 0 0; color: var(--deep-olive); font-weight: 700; }
.garden-progress { margin: 10px 0 0; color: var(--muted); font-size: 0.82rem; }

.garden-art-wrap {
  position: relative;
  min-width: 0;
  transform: translate3d(var(--pointer-x, 0px), var(--pointer-y, 0px), 0);
  transition: transform 300ms ease;
}

.blessing-garden { display: block; width: 100%; height: auto; overflow: visible; }
.garden-sky { fill: url(#garden-sky); }
.garden-hill-back { fill: #c8d5c4; }
.garden-hill-front { fill: #adbea9; }
.garden-stars { fill: var(--autumn); opacity: 0.64; }
.garden-grass { fill: none; stroke: #71866f; stroke-width: 8; stroke-linecap: round; stroke-linejoin: round; opacity: 0.65; }
.flower-stem { fill: none; stroke: #59715b; stroke-width: 7; stroke-linecap: round; }
.flower-leaf { fill: #789479; }
.garden-flower { cursor: pointer; outline: none; }
.garden-flower:focus-visible { filter: drop-shadow(0 0 5px rgb(195 123 80 / 0.72)); }
.garden-flower:focus-visible .flower-center { stroke: var(--autumn); stroke-width: 5; }
.flower-bloom { transform-box: fill-box; transform-origin: center; transition: transform 520ms cubic-bezier(.2,.8,.2,1); }
.flower-petal { fill: #d6a86d; opacity: 0.82; transform-box: fill-box; transform-origin: center; transition: fill 320ms ease, opacity 320ms ease; }
.garden-flower:nth-of-type(2) .flower-petal { fill: #b9805e; }
.garden-flower:nth-of-type(3) .flower-petal { fill: #ad9b68; }
.flower-center { fill: #3f5744; stroke: transparent; transition: fill 320ms ease, stroke 160ms ease; }
.flower-glow { fill: #e3c878; opacity: 0; transition: opacity 420ms ease; }
.garden-flower:hover .flower-bloom,
.garden-flower:focus-visible .flower-bloom { transform: scale(1.06); }
.garden-flower.is-bloomed .flower-bloom { transform: scale(1.14) translateY(-3px); }
.garden-flower.is-bloomed .flower-petal { fill: #e0b56e; opacity: 1; }
.garden-flower.is-bloomed .flower-glow { opacity: 0.62; }
.garden-flower.is-bloomed .flower-center { fill: var(--autumn); }
.garden-hint { display: block; margin-top: 10px; color: var(--muted); font-size: 0.78rem; text-align: right; }

.memories { padding-bottom: 64px; }
.section-heading-row { display: flex; justify-content: space-between; gap: 24px; align-items: end; margin-bottom: 28px; }
.memories h2 { font-size: clamp(1.7rem, 3vw, 2.5rem); }
.section-aside { max-width: 18rem; margin: 0; color: var(--muted); text-align: right; }

.memory-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.memory-photo:nth-child(odd) { grid-column: span 7; }
.memory-photo:nth-child(even) { grid-column: span 5; }
.memory-photo { position: relative; align-self: start; overflow: hidden; border-radius: 2px; }
.memory-photo img { transition: transform 500ms cubic-bezier(.2,.7,.2,1), filter 500ms ease; }
.memory-photo:hover img,
.memory-photo:focus-visible img { filter: saturate(1.08); transform: scale(1.025); }
.memory-index { position: absolute; right: 12px; bottom: 10px; color: white; font-size: 0.78rem; font-weight: 700; text-shadow: 0 1px 10px rgb(0 0 0 / .65); pointer-events: none; }

.site-signoff {
  margin: 0;
  padding: 36px 0 72px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  text-align: center;
}

.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;
}

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

#photo-lightbox {
  max-width: 92vw;
  max-height: 92vh;
  border: 1px solid var(--rule);
  padding: 16px;
  background: var(--paper);
}

#photo-lightbox::backdrop { background: rgb(29 36 32 / 0.76); }
#lightbox-image { display: block; max-width: 88vw; max-height: 80vh; width: auto; height: auto; margin-top: 12px; }
#lightbox-close { min-width: 44px; min-height: 44px; border: 1px solid var(--olive); border-radius: 3px; color: var(--olive); background: var(--surface); cursor: pointer; }
#lightbox-close:hover { color: var(--surface); background: var(--olive); }

@keyframes letter-in {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes letter-out {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-8px); }
}

@media (max-width: 820px) {
  .hero { gap: 32px; }
  .garden { grid-template-columns: 1fr; gap: 30px; }
  .garden-intro { max-width: 38rem; }
  .garden-art-wrap { width: min(100%, 680px); margin-inline: auto; }
}

@media (max-width: 720px) {
  .site-header,
  .page-shell { width: calc(100% - 32px); }
  .hero { display: block; padding: 32px 0 48px; }
  .hero-copy { margin: 18px 0 0; }
  .hero-jump { margin-top: 24px; }
  .botanical-mark { width: 60px; height: 80px; opacity: 0.35; }
  .hero-photo { margin-top: 34px; }
  .letter-block { margin-bottom: 72px; }
  .garden { margin-bottom: 84px; }
  .garden-hint { text-align: left; }
  .section-heading-row { display: block; }
  .section-aside { margin-top: 12px; text-align: left; }
  .memory-grid { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .memory-photo:nth-child(n) { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .garden-art-wrap { transform: none !important; }
}