/* ============================================
   我们的小宇宙 · 手账风样式
   纯静态，无外部依赖，可离线打开
   ============================================ */

:root {
  --paper: #fdf6e8;
  --paper-2: #f8eeda;
  --card: #fffdf7;
  --ink: #5e4030;
  --ink-soft: #6b4b38;
  --ink-mute: #9b7b63;
  --ink-faint: #b39a80;
  --pink: #f19bb2;
  --pink-deep: #e2708f;
  --pink-dark: #c94f72;
  --mint: #a9d8c8;
  --butter: #f9d98c;
  --line: rgba(196, 166, 124, .28);
  --font-hand: "Kaiti SC", "STKaiti", "KaiTi", "楷体", "Kai", "Songti SC", serif;
  --font-ui: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --shadow-card: 0 20px 40px -22px rgba(140, 100, 70, .45), 0 1px 0 #fff inset;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100%;
  color: var(--ink-soft);
  font-family: var(--font-ui);
  line-height: 1.7;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 50% -10%, #fffdf4 0%, rgba(255, 253, 244, 0) 55%),
    linear-gradient(rgba(196, 166, 124, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 166, 124, .16) 1px, transparent 1px);
  background-size: 100% 100%, 26px 26px, 26px 26px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: #ffd9e2; color: var(--ink); }

/* 纸张颗粒 */
.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.28'/%3E%3C/svg%3E");
}

/* ---------- 布局 ---------- */
.page {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 18px 72px;
}

/* ---------- 胶带 ---------- */
.tape {
  position: absolute;
  display: block;
  width: 132px;
  height: 30px;
  background: repeating-linear-gradient(45deg, #ffd9a8, #ffd9a8 9px, #ffebcd 9px, #ffebcd 18px);
  opacity: .92;
  box-shadow: 0 1px 3px rgba(120, 90, 60, .18);
  clip-path: polygon(2% 0, 98% 4%, 100% 46%, 97% 100%, 3% 96%, 0 52%);
  z-index: 3;
}
.tape--tl { top: -12px; left: -26px; transform: rotate(-11deg); }
.tape--tr { top: -6px; right: -34px; transform: rotate(8deg); width: 112px; opacity: .8; }

/* ---------- 隐藏小彩蛋 ---------- */
.egg {
  position: absolute;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--pink-deep);
  font-size: 15px;
  line-height: 1;
  opacity: .12;
  cursor: pointer;
  transition: opacity .2s, transform .2s;
  z-index: 4;
}
.egg:hover, .egg:focus-visible { opacity: .5; transform: scale(1.2); }
.egg--1 { top: 268px; left: 2px; }
.egg--2 { top: 48%; right: 0; }
.egg--3 { bottom: 300px; left: 42%; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: 58px 0 0;
  text-align: center;
}
.hero__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--ink-faint);
  text-indent: .34em;
}
.hero__title {
  margin: 12px 0 0;
  font-family: var(--font-hand);
  font-weight: 600;
  font-size: clamp(38px, 10.5vw, 58px);
  letter-spacing: .07em;
  color: var(--ink);
  text-shadow: 1px 1px 0 #fffaf0;
}
.hero__underline {
  display: block;
  width: min(272px, 72%);
  margin: 4px auto 0;
  color: var(--pink-deep);
  opacity: .8;
}
.hero__sub {
  margin: 16px auto 0;
  max-width: 22em;
  font-family: var(--font-hand);
  font-size: 16px;
  letter-spacing: .06em;
  color: var(--ink-mute);
}
.stamp {
  position: absolute;
  top: 40px;
  right: 2px;
  display: grid;
  place-content: center;
  width: 74px;
  height: 74px;
  border: 2px dashed rgba(226, 112, 143, .55);
  border-radius: 50%;
  color: var(--pink-deep);
  text-align: center;
  line-height: 1.15;
  letter-spacing: .16em;
  transform: rotate(-13deg);
  opacity: .85;
}
.stamp b { display: block; font-size: 12px; letter-spacing: .2em; }
.stamp i { font-style: normal; font-size: 10px; letter-spacing: .24em; opacity: .85; }

/* ---------- 通用卡片 ---------- */
.card {
  position: relative;
  margin-top: 42px;
  padding: 32px 22px 26px;
  background: var(--card);
  border: 1px solid rgba(210, 180, 145, .4);
  border-radius: 22px;
  box-shadow: var(--shadow-card);
}
.card::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(196, 166, 124, .32);
  border-radius: 16px;
  pointer-events: none;
}
.card__tape {
  position: absolute;
  top: -15px;
  left: 50%;
  width: 112px;
  height: 28px;
  transform: translateX(-50%) rotate(-3deg);
  background: repeating-linear-gradient(45deg, #ffd9a8, #ffd9a8 9px, #ffebcd 9px, #ffebcd 18px);
  opacity: .95;
  clip-path: polygon(1% 6%, 99% 0, 100% 52%, 98% 100%, 2% 94%, 0 48%);
  box-shadow: 0 1px 3px rgba(120, 90, 60, .2);
}

/* ---------- 倒计时 ---------- */
.counter { transform: rotate(-.7deg); text-align: center; }
.counter__label {
  margin: 2px 0 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--ink-mute);
}
.counter__days {
  margin: 2px 0 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
}
.counter__num {
  font-family: var(--font-hand);
  font-size: clamp(62px, 17vw, 88px);
  line-height: 1.05;
  color: var(--pink-deep);
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
}
.counter__unit {
  font-family: var(--font-hand);
  font-size: 20px;
  color: var(--ink-mute);
}
.counter__since {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ink-faint);
}
.counter__divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 18px;
  color: var(--pink);
  font-size: 12px;
}
.counter__divider::before,
.counter__divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 7px, transparent 7px 13px);
}
.counter__next {
  padding: 14px 12px 12px;
  background: rgba(255, 214, 224, .28);
  border: 1px dashed rgba(226, 112, 143, .4);
  border-radius: 14px;
}
.counter__nextLabel {
  margin: 0 0 4px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--ink-mute);
}
.counter__clock {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--pink-dark);
  font-variant-numeric: tabular-nums;
}

/* ---------- 区块标题 ---------- */
.sec-head { text-align: center; margin-bottom: 6px; }
.sec-title {
  margin: 0;
  font-family: var(--font-hand);
  font-weight: 600;
  font-size: clamp(26px, 7vw, 32px);
  letter-spacing: .1em;
  color: var(--ink);
}
.sec-mark {
  display: inline-block;
  margin-left: 8px;
  font-size: 15px;
  color: var(--pink);
  transform: translateY(-6px) rotate(8deg);
}
.sec-sub {
  margin: 2px 0 0;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--ink-faint);
}

/* ---------- 照片墙 ---------- */
.wall { margin-top: 56px; }
.wall__grid {
  columns: 2;
  column-gap: 18px;
  margin-top: 26px;
  padding: 0 4px;
}
.shot {
  position: relative;
  display: block;
  width: 100%;
  margin: 0 0 20px;
  padding: 9px 9px 36px;
  background: #fffef9;
  border: 0;
  border-radius: 4px;
  font: inherit;
  -webkit-appearance: none;
  appearance: none;
  break-inside: avoid;
  -webkit-column-break-inside: avoid;
  page-break-inside: avoid;
  box-shadow: 0 12px 22px -14px rgba(110, 80, 55, .6), 0 0 0 1px rgba(150, 120, 90, .08);
  transform: rotate(var(--r, -2deg));
  transition: transform .35s cubic-bezier(.2, .8, .3, 1), box-shadow .35s;
  cursor: zoom-in;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.shot:nth-child(3n + 1) { --r: -2.4deg; }
.shot:nth-child(3n + 2) { --r: 1.8deg; }
.shot:nth-child(3n) { --r: -1deg; }
.shot:nth-child(4n) { --r: 2.6deg; }
.shot:hover, .shot:focus-visible {
  transform: rotate(0deg) translateY(-5px) scale(1.02);
  box-shadow: 0 20px 30px -16px rgba(110, 80, 55, .65), 0 0 0 1px rgba(150, 120, 90, .1);
  outline: none;
  z-index: 2;
}
.shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 3px;
  background: var(--paper-2);
  user-select: none;
}
.shot__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  padding: 0 8px;
  font-family: var(--font-hand);
  font-size: 13px;
  line-height: 1.2;
  color: var(--ink-mute);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shot:nth-child(3n)::after {
  content: "";
  position: absolute;
  top: -9px;
  left: 50%;
  width: 74px;
  height: 22px;
  transform: translateX(-50%) rotate(-4deg);
  background: rgba(255, 224, 168, .92);
  box-shadow: 0 1px 2px rgba(120, 90, 60, .18);
  clip-path: polygon(2% 8%, 98% 0, 100% 55%, 96% 100%, 3% 92%, 0 46%);
}

/* ---------- 小游戏 ---------- */
.game { margin-top: 62px; }
.game__board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 400px;
  margin: 24px auto 0;
  perspective: 1000px;
}
.gcard {
  position: relative;
  aspect-ratio: 3 / 4;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  perspective: 800px;
  border-radius: 12px;
  touch-action: manipulation;
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}
.gcard__inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform .45s cubic-bezier(.2, .8, .3, 1);
  border-radius: 12px;
}
.gcard.is-flipped .gcard__inner { transform: rotateY(180deg); }
.gcard__face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 11px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: 0 8px 16px -10px rgba(120, 90, 60, .6), inset 0 0 0 2px #fffdf7;
}
.gcard__back {
  background-color: #ffe4ec;
  background-image:
    radial-gradient(circle at 18% 16%, rgba(255, 255, 255, .85) 0 8px, transparent 9px),
    radial-gradient(circle at 82% 74%, rgba(255, 255, 255, .7) 0 6px, transparent 7px),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, .32) 0 8px, transparent 8px 16px);
  border: 2px dashed rgba(226, 112, 143, .38);
  color: var(--pink-deep);
  font-family: var(--font-hand);
  font-size: 30px;
  line-height: 1;
}
.gcard__back span { transform: translateY(-2px); }
.gcard__front {
  transform: rotateY(180deg);
  padding: 5px;
  background: #fffef9;
}
.gcard__front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}
.gcard.is-matched { cursor: default; }
.gcard.is-matched .gcard__face {
  box-shadow: 0 0 0 3px rgba(255, 224, 168, .95), 0 8px 16px -10px rgba(120, 90, 60, .5);
}
.gcard.is-matched .gcard__front::after {
  content: "✓";
  position: absolute;
  top: 6px;
  right: 8px;
  width: 22px;
  height: 22px;
  display: grid;
  place-content: center;
  border-radius: 50%;
  background: var(--pink-deep);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  transform: rotate(8deg);
}
.gcard.is-wrong .gcard__inner { animation: shake .42s ease; }

/* 中间的礼物卡 */
.gcard--special .gcard__back {
  background-color: #f7e7c9;
  background-image:
    linear-gradient(135deg, rgba(255, 255, 255, .55) 0 6px, transparent 6px),
    repeating-linear-gradient(-45deg, rgba(201, 158, 96, .14) 0 7px, transparent 7px 14px);
  border-color: rgba(201, 158, 96, .5);
  color: #b98a5a;
}
.gcard--special .gcard__back span { font-size: 26px; }
.gcard--special .gcard__front {
  background: #fff8ec;
  place-items: center;
}
.gcard--locked { cursor: pointer; }
.gcard--unlocked .gcard__back {
  animation: glow 1.7s ease-in-out infinite;
  border-color: rgba(226, 112, 143, .75);
}
.gcard--unlocked .gcard__back::after {
  content: "点 开";
  position: absolute;
  bottom: 9px;
  left: 0;
  right: 0;
  font-family: var(--font-hand);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--pink-dark);
  text-align: center;
}
@keyframes glow {
  0%, 100% { box-shadow: 0 8px 16px -10px rgba(120, 90, 60, .5), 0 0 0 0 rgba(226, 112, 143, .5), inset 0 0 0 2px #fffdf7; }
  50% { box-shadow: 0 8px 18px -8px rgba(226, 112, 143, .55), 0 0 0 9px rgba(226, 112, 143, 0), inset 0 0 0 2px #fffdf7; }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

.game__bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ink-faint);
}
.game__bar b { color: var(--pink-deep); font-size: 15px; font-variant-numeric: tabular-nums; }
.game__dot { opacity: .5; }
.game__hint {
  min-height: 22px;
  margin: 8px 0 0;
  font-family: var(--font-hand);
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--ink-faint);
  text-align: center;
  transition: color .3s;
}
.game__hint.is-hot { color: var(--pink-dark); }

/* ---------- 页脚 ---------- */
.footer {
  margin-top: 64px;
  text-align: center;
  font-family: var(--font-hand);
  color: var(--ink-faint);
}
.footer__line { margin: 0; font-size: 15px; letter-spacing: .08em; }
.footer__sign { margin: 10px 0 0; font-size: 11.5px; letter-spacing: .18em; color: #c9ae94; }
.footer__sign span { color: var(--pink-deep); }

/* ---------- 大图 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(70, 48, 36, .55);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .28s ease, visibility .28s;
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox__frame {
  margin: 0;
  padding: 12px 12px 6px;
  background: #fffef9;
  border-radius: 5px;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .5);
  transform: rotate(-1.4deg) scale(.94);
  transition: transform .32s cubic-bezier(.2, .8, .3, 1);
  max-width: min(92vw, 540px);
}
.lightbox.is-open .lightbox__frame { transform: rotate(-1.4deg) scale(1); }
.lightbox__frame img {
  display: block;
  max-width: 100%;
  max-height: 68vh;
  object-fit: contain;
  border-radius: 3px;
  background: var(--paper-2);
}
.lightbox__frame figcaption {
  padding: 12px 4px 10px;
  font-family: var(--font-hand);
  font-size: 15px;
  color: var(--ink-mute);
  text-align: center;
}
.lightbox__close {
  position: absolute;
  top: max(18px, env(safe-area-inset-top));
  right: 18px;
  width: 40px;
  height: 40px;
  display: grid;
  place-content: center;
  border: 1px solid rgba(255, 255, 255, .5);
  border-radius: 50%;
  background: rgba(255, 253, 246, .9);
  color: var(--ink-soft);
  font-size: 15px;
  cursor: pointer;
}

/* ---------- 情书 ---------- */
.letter {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(70, 48, 36, .5);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s;
}
.letter.is-open { opacity: 1; visibility: visible; }
.letter__paper {
  position: relative;
  z-index: 1;
  width: min(92vw, 520px);
  max-height: 86vh;
  overflow-y: auto;
  padding: 36px 22px 24px;
  background-color: #fffdf4;
  background-image:
    linear-gradient(to right, rgba(226, 112, 143, .2) 0 1px, transparent 1px),
    repeating-linear-gradient(to bottom, transparent 0 31px, rgba(196, 166, 124, .26) 31px 32px);
  background-position: 26px 0, 0 0;
  background-size: 100% 100%, 100% 32px;
  background-repeat: no-repeat, repeat-y;
  border-radius: 5px;
  box-shadow: 0 34px 60px -22px rgba(0, 0, 0, .45), 0 0 0 1px rgba(150, 120, 90, .12);
  transform: rotate(-.7deg) scale(.95);
  transition: transform .34s cubic-bezier(.2, .8, .3, 1);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(196, 166, 124, .55) transparent;
}
.letter__paper::-webkit-scrollbar { width: 6px; }
.letter__paper::-webkit-scrollbar-track { background: transparent; }
.letter__paper::-webkit-scrollbar-thumb {
  background: rgba(196, 166, 124, .5);
  border-radius: 3px;
}
.letter.is-open .letter__paper { transform: rotate(-.7deg) scale(1); }
.letter__x {
  position: absolute;
  top: max(14px, env(safe-area-inset-top));
  right: 14px;
  width: 38px;
  height: 38px;
  display: grid;
  place-content: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .45);
  border-radius: 50%;
  background: rgba(255, 253, 246, .92);
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  z-index: 3;
}
.letter__seal {
  position: absolute;
  top: -16px;
  right: 18px;
  width: 54px;
  height: 54px;
  display: grid;
  place-content: center;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ef8ba6, #c94f72);
  color: #fff4f7;
  font-size: 19px;
  box-shadow: 0 8px 16px -6px rgba(160, 60, 85, .6), inset 0 -2px 4px rgba(0, 0, 0, .15);
  transform: rotate(10deg);
}
.letter__title {
  margin: 0 0 16px;
  font-family: var(--font-hand);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: .1em;
  text-align: center;
  color: var(--ink);
}
.letter__body p {
  margin: 0 0 32px;
  font-family: var(--font-hand);
  font-size: 15.5px;
  line-height: 32px;
  color: var(--ink-soft);
  white-space: pre-line;
  letter-spacing: 0;
}
.letter__body p:last-child { margin-bottom: 8px; }
.letter__sign {
  margin: 18px 0 0;
  font-family: var(--font-hand);
  font-size: 15px;
  color: var(--ink-mute);
  text-align: right;
  letter-spacing: .04em;
}
.letter__close {
  display: block;
  margin: 26px auto 4px;
  padding: 9px 24px;
  border: 1px dashed rgba(226, 112, 143, .6);
  border-radius: 999px;
  background: #fff0f4;
  color: var(--pink-dark);
  font-family: var(--font-hand);
  font-size: 15px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: transform .2s, background .2s;
}
.letter__close:hover { transform: translateY(-1px); background: #ffe6ee; }

/* ---------- 背景音乐开关 ---------- */
.bgm {
  position: fixed;
  right: max(14px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 55;
  width: 46px;
  height: 46px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 1px dashed rgba(226, 112, 143, .6);
  border-radius: 50%;
  background: #fffdf7;
  box-shadow: 0 12px 22px -14px rgba(120, 90, 60, .6), 0 0 0 4px rgba(255, 253, 247, .55);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform .25s, border-color .25s;
}
.bgm:hover { transform: translateY(-2px); }
.bgm:focus-visible { outline: 2px solid var(--pink-deep); outline-offset: 3px; }
.bgm__disc {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, #fffdf7 0 4.5px, transparent 4.6px),
    repeating-conic-gradient(from 0deg, #ffe6ec 0deg 14deg, #ffd2dd 14deg 28deg);
  box-shadow: inset 0 0 0 1px rgba(226, 112, 143, .28);
  opacity: .6;
  transition: opacity .3s;
}
.bgm.is-playing {
  border-style: solid;
  border-color: rgba(226, 112, 143, .8);
}
.bgm.is-playing .bgm__disc {
  opacity: 1;
  animation: bgm-spin 5s linear infinite;
}
.bgm__note {
  position: absolute;
  top: 50%;
  left: 50%;
  font-family: var(--font-hand);
  font-size: 15px;
  line-height: 1;
  color: var(--pink-dark);
  pointer-events: none;
  transform: translate(-50%, -52%);
}
.bgm.is-missing { opacity: .55; }
.bgm.is-hint { animation: bgm-hint 1.8s ease-in-out infinite; }
@keyframes bgm-hint {
  0%, 100% {
    box-shadow: 0 12px 22px -14px rgba(120, 90, 60, .6), 0 0 0 4px rgba(255, 253, 247, .55);
  }
  50% {
    box-shadow: 0 12px 22px -14px rgba(120, 90, 60, .6), 0 0 0 10px rgba(226, 112, 143, .25);
  }
}
@keyframes bgm-spin { to { transform: rotate(360deg); } }

/* ---------- 提示 & 飘心 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 90;
  max-width: 84vw;
  padding: 9px 18px;
  border-radius: 999px;
  background: rgba(94, 64, 48, .93);
  color: #fff7ec;
  font-size: 13px;
  letter-spacing: .04em;
  text-align: center;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity .28s, transform .28s;
  pointer-events: none;
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

.hearts {
  position: fixed;
  inset: 0;
  z-index: 80;
  overflow: hidden;
  pointer-events: none;
}
/* 情书打开时，心在信纸后面飘 */
.letter .hearts { z-index: 0; }
.heart {
  position: absolute;
  top: -30px;
  color: var(--pink);
  font-size: 16px;
  animation: fall linear forwards;
  will-change: transform, opacity;
}
@keyframes fall {
  0% { transform: translateY(0) rotate(0); opacity: 0; }
  10% { opacity: .95; }
  100% { transform: translateY(105vh) rotate(340deg); opacity: 0; }
}

/* ---------- 入场 ---------- */
.js .reveal {
  opacity: 0;
  translate: 0 18px;
  transition: opacity .75s ease, translate .75s cubic-bezier(.2, .8, .3, 1);
}
.js .reveal.is-in { opacity: 1; translate: 0 0; }

/* ---------- 适配 ---------- */
@media (min-width: 640px) {
  .page { padding: 0 28px 88px; }
  .hero { padding-top: 74px; }
  .wall__grid { columns: 3; column-gap: 22px; }
  .game__board { gap: 12px; max-width: 470px; }
  .shot__cap { font-size: 14px; }
  .letter__paper { padding: 46px 40px 28px; }
  .letter__body p { font-size: 17.5px; }
}

@media (max-width: 480px) {
  .stamp { display: none; }
  .tape--tr { display: none; }
  .card { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js .reveal { opacity: 1; translate: none; }
}