/* ============================================================
   样式表：颜色、字体、排版都在这里
   想换颜色，改最上面 :root 里的色值就行
   ============================================================ */

:root {
  --paper: #FAFAF5;      /* 纸 */
  --white: #FFFFFF;
  --grid: #86B89A;       /* 稿纸格线绿 */
  --grid-soft: #D5E7DB;  /* 浅格线 */
  --ink: #22378F;        /* 圆珠笔蓝 */
  --ink-2: #2E46A8;
  --seal: #BF2F2A;       /* 印泥红 */
  --print: #2E3138;      /* 印刷字 */
  --pencil: #5F636B;     /* 铅笔灰 */
  --tape: rgba(231, 208, 140, 0.72);
  --bamboo: #EFE4C6;

  --hand: "Long Cang", "KaiTi", "STKaiti", "Kaiti SC", cursive;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;

  --pad: clamp(18px, 5vw, 48px);
  --cols: 10;
  --cell: min(64px, calc((100vw - 2 * var(--pad)) / var(--cols)));
}

@media (max-width: 560px) {
  :root { --cols: 8; }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--print);
  font: 17px/1.75 var(--sans);
}

.hand {
  font-family: var(--hand);
  font-weight: normal;
  color: var(--ink);
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: clamp(40px, 8vw, 96px) var(--pad) 56px;
}

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

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

button { font: inherit; }

[hidden] { display: none !important; }

/* ---------- 首页：稿纸上的信 ---------- */

.letter { max-width: 720px; }

.salute {
  margin: 0 0 1rem;
  font-size: clamp(1.9rem, 5.4vw, 2.5rem);
  line-height: 1.2;
}

.manuscript {
  margin: 0;
  font: inherit;
}

.ms-grid {
  display: grid;
  gap: calc(var(--cell) * 0.16);
  width: calc(var(--cols) * var(--cell));
  max-width: 100%;
}

.ms-row {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  border: 1.5px solid var(--grid);
}

.ms-cell {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-left: 1px solid var(--grid);
  font-family: var(--hand);
  font-size: calc(var(--cell) * 0.64);
  line-height: 1;
  color: var(--ink);
}

.ms-cell:first-child { border-left: 0; }

.ms-num { font-size: calc(var(--cell) * 0.86); }

/* 稿纸里的标点占一格，写在左下角 */
.ms-punct {
  place-items: end start;
  padding: 0 0 14% 20%;
}

.ms-char { display: inline-block; }

.ms-grid.is-waiting .ms-char { opacity: 0; }

.ms-grid.is-writing .ms-char {
  animation: write 0.34s ease-out both;
  animation-delay: var(--d, 0ms);
}

@keyframes write {
  from { opacity: 0.15; clip-path: inset(0 100% 0 0); }
  to   { opacity: 1;    clip-path: inset(0 0 0 0); }
}

.since {
  margin: 1rem 0 2.4rem;
  color: var(--pencil);
  font-size: 0.95rem;
}

.letter-body {
  --lh: 2.5rem;
  max-width: 680px;
  font-size: clamp(1.45rem, 3.8vw, 1.75rem);
  line-height: var(--lh);
  background-image: linear-gradient(to bottom, transparent calc(var(--lh) - 1px), var(--grid-soft) calc(var(--lh) - 1px));
  background-size: 100% var(--lh);
}

.letter-body p {
  margin: 0;
  text-indent: 2em;
}

.sign {
  position: relative;
  max-width: 680px;
  margin-top: 1.4rem;
  padding-right: 104px;
  text-align: right;
}

.sign-name {
  margin: 0;
  font-size: 1.9rem;
  line-height: 1.3;
}

.sign-date {
  margin: 0;
  color: var(--pencil);
  font-size: 0.92rem;
}

.seal {
  position: absolute;
  right: 6px;
  top: -4px;
  display: grid;
  grid-auto-flow: column;
  direction: rtl;           /* 印章从右往左读 */
  place-items: center;
  width: 78px;
  height: 78px;
  padding: 10px;
  background: var(--seal);
  color: var(--paper);
  font-family: var(--hand);
  line-height: 1;
  border-radius: 5px;
  outline: 2px solid var(--paper);
  outline-offset: -6px;
  opacity: 0.93;
  mix-blend-mode: multiply;
  transform: rotate(-6deg);
}

.seal.is-waiting { opacity: 0; }

.seal.stamp { animation: stamp 0.42s cubic-bezier(0.2, 0.9, 0.3, 1.2) both; }

@keyframes stamp {
  0%   { opacity: 0;    transform: rotate(-6deg) scale(1.7); }
  70%  { opacity: 0.95; transform: rotate(-6deg) scale(0.96); }
  100% { opacity: 0.93; transform: rotate(-6deg) scale(1); }
}

/* ---------- 通用段落 ---------- */

.section { margin-top: clamp(80px, 12vw, 136px); }

.section > h2 {
  margin: 0 0 1.4rem;
  font-size: clamp(2.3rem, 6vw, 3.1rem);
  line-height: 1.1;
}

.section > .hint {
  margin: -0.8rem 0 2rem;
  color: var(--pencil);
}

.empty {
  margin: 0;
  color: var(--pencil);
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: 0;
  border-radius: 4px;
  background: var(--ink);
  color: var(--paper);
  font-size: 1rem;
  line-height: 1.2;
  cursor: pointer;
}

.btn:hover { background: var(--ink-2); }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.btn-quiet:hover { background: rgba(34, 55, 143, 0.06); }

/* ---------- 倒计时 ---------- */

.days {
  max-width: 760px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1.5px solid var(--grid);
}

.day {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name left"
    "date left";
  align-items: center;
  column-gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--grid-soft);
}

.day-name {
  grid-area: name;
  font-size: 1.75rem;
  line-height: 1.25;
}

.day-date {
  grid-area: date;
  color: var(--pencil);
  font-size: 0.92rem;
}

.day-left {
  grid-area: left;
  text-align: right;
  white-space: nowrap;
}

.day-num {
  font-family: var(--hand);
  font-size: 2.7rem;
  line-height: 1;
  color: var(--ink);
}

.day-unit { margin-left: 0.25em; }

.day-clock {
  display: block;
  color: var(--pencil);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

.day.is-today .day-num { color: var(--seal); font-size: 2.2rem; }

/* ---------- 照片墙 ---------- */

.wall {
  columns: 3 150px;
  column-gap: clamp(16px, 3vw, 38px);
  padding-top: 14px;
}

.print {
  position: relative;
  display: inline-block;
  width: 100%;
  margin: 0 0 clamp(30px, 4vw, 46px);
  padding: 10px 10px 12px;
  background: var(--white);
  box-shadow: 0 1px 1px rgba(34, 55, 143, 0.06), 0 12px 26px -16px rgba(34, 55, 143, 0.4);
  transform: rotate(var(--tilt, 0deg));
  break-inside: avoid;
}

/* 胶带 */
.print::before {
  content: "";
  position: absolute;
  top: -11px;
  left: 50%;
  width: 88px;
  height: 22px;
  background: var(--tape);
  transform: translateX(-50%) rotate(var(--tape-tilt, -3deg));
}

.print-open {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: zoom-in;
}

.print img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--grid-soft);
}

.print figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0 0.8rem;
  padding-top: 0.5rem;
}

.print-cap {
  font-family: var(--hand);
  font-size: 1.4rem;
  line-height: 1.25;
  color: var(--ink);
}

.print-date {
  color: var(--pencil);
  font-size: 0.8rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* 照片文件找不到时显示的提示 */
.photo-missing {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  padding: 1rem;
  background: repeating-linear-gradient(135deg, var(--paper) 0 10px, var(--grid-soft) 10px 11px);
  color: var(--seal);
  font-size: 0.85rem;
  line-height: 1.5;
  text-align: center;
  word-break: break-all;
}

/* ---------- 大图弹窗 ---------- */

.viewer {
  max-width: 94vw;
  max-height: none;
  padding: 0;
  border: 0;
  background: transparent;
  overflow: visible;
}

.viewer::backdrop { background: rgba(16, 24, 58, 0.88); }

.viewer-fig {
  margin: 0;
  padding: 12px 12px 14px;
  background: var(--white);
}

.viewer-fig img {
  display: block;
  width: auto;
  height: auto;
  max-width: min(1000px, calc(94vw - 24px));
  max-height: calc(100vh - 170px);
  margin: 0 auto;
}

.viewer-fig figcaption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-top: 0.5rem;
}

.viewer-cap {
  font-family: var(--hand);
  font-size: 1.7rem;
  line-height: 1.2;
  color: var(--ink);
}

.viewer-date {
  color: var(--pencil);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.viewer-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 14px;
  color: var(--paper);
}

.viewer-count {
  min-width: 4em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.viewer-btn {
  padding: 0.45rem 1rem;
  border: 1px solid rgba(250, 250, 245, 0.55);
  border-radius: 4px;
  background: transparent;
  color: var(--paper);
  font-size: 0.95rem;
  cursor: pointer;
}

.viewer-btn:hover { background: rgba(250, 250, 245, 0.12); }

.viewer-close { margin-left: auto; }

.viewer :focus-visible { outline-color: var(--paper); }

/* ---------- 小游戏 ---------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.8rem;
  margin-bottom: 1.2rem;
}

.tab {
  padding: 0.1rem 0 0.25rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--pencil);
  font-family: var(--hand);
  font-size: 1.8rem;
  line-height: 1.2;
  cursor: pointer;
}

.tab:hover { color: var(--ink); }

.tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.panel {
  min-height: 380px;
  padding: clamp(20px, 4vw, 40px);
  border: 1.5px solid var(--grid);
  background: var(--white);
}

.panel[hidden] { display: none; }

/* 默契问答：像一张被老师批改的卷子 */

.quiz-progress {
  margin: 0 0 0.4rem;
  color: var(--pencil);
  font-size: 0.92rem;
}

.quiz-q {
  margin: 0 0 1.4rem;
  font-size: clamp(1.75rem, 4.6vw, 2.2rem);
  line-height: 1.3;
}

.quiz-options {
  display: grid;
  gap: 0.6rem;
  max-width: 520px;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}

.opt {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  width: 100%;
  padding: 0.7rem 3.4rem 0.7rem 1rem;
  border: 1px solid var(--grid-soft);
  border-radius: 4px;
  background: var(--paper);
  color: var(--print);
  text-align: left;
  cursor: pointer;
}

.opt:hover:not(:disabled) { border-color: var(--grid); }

.opt:disabled { cursor: default; }

.opt-letter {
  width: 1.2em;
  color: var(--pencil);
  font-weight: 600;
}

.opt.is-answer { border-color: var(--seal); }

.opt-mark {
  position: absolute;
  right: 0.9rem;
  top: 50%;
  width: 30px;
  height: 30px;
  transform: translateY(-50%) rotate(-6deg);
}

.opt-mark path {
  fill: none;
  stroke: var(--seal);
  stroke-width: 3.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.quiz-feedback {
  min-height: 1.75em;
  margin: 0 0 1rem;
  color: var(--seal);
}

.quiz-score {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin: 0.4rem 0 0.8rem;
  color: var(--seal);
  font-family: var(--hand);
}

.quiz-score-num {
  font-size: 6rem;
  line-height: 1;
  border-bottom: 4px double var(--seal);
}

.quiz-score-unit { font-size: 2rem; }

.quiz-msg {
  max-width: 30em;
  margin: 0 0 1.6rem;
  font-size: 1.7rem;
  line-height: 1.4;
}

/* 照片翻翻乐 */

.mem-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.6rem;
  margin: 0 0 1rem;
  color: var(--pencil);
  font-variant-numeric: tabular-nums;
}

.mem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(8px, 1.6vw, 14px);
  max-width: 560px;
  margin-bottom: 1.4rem;
}

@media (max-width: 560px) {
  .mem-grid { grid-template-columns: repeat(3, 1fr); }
}

.card {
  aspect-ratio: 3 / 4;
  padding: 0;
  border: 0;
  background: none;
  perspective: 800px;
  cursor: pointer;
}

.card-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.3, 0.7, 0.3, 1);
}

.card.is-open .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 4px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

/* 牌背：信封内侧那种蓝色防透花纹 */
.card-back {
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(135deg, var(--ink) 0 7px, #2A40A0 7px 14px);
}

.card-back span {
  display: grid;
  place-items: center;
  width: 46%;
  aspect-ratio: 1;
  border: 1.5px solid rgba(250, 250, 245, 0.75);
  color: var(--paper);
  font-family: var(--hand);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1;
}

.card-front {
  padding: 5px;
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--grid-soft);
  transform: rotateY(180deg);
}

.card-front img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card.is-matched .card-front { box-shadow: inset 0 0 0 3px var(--grid); }

.card.is-matched { cursor: default; }

.mem-win {
  margin: 0 0 1rem;
  font-size: 1.7rem;
  line-height: 1.4;
}

/* 约会抽签 */

.lots {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: clamp(28px, 6vw, 64px);
}

@media (max-width: 560px) {
  .lots {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
}

.tube-wrap {
  position: relative;
  width: 140px;
  height: 250px;
  transform-origin: 50% 92%;
}

.tube-wrap.is-shaking { animation: shake 0.7s ease-in-out; }

@keyframes shake {
  0%, 100% { transform: rotate(0); }
  15% { transform: rotate(-10deg); }
  35% { transform: rotate(9deg); }
  55% { transform: rotate(-6deg); }
  75% { transform: rotate(4deg); }
}

.stick {
  position: absolute;
  bottom: 40px;
  width: 12px;
  border-radius: 3px 3px 0 0;
  background: var(--bamboo);
  transform-origin: 50% 100%;
  transition: translate 0.45s ease-out;
}

.stick::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 20px;
  border-radius: 3px 3px 0 0;
  background: var(--seal);
}

.stick.is-out { translate: 0 -58px; }

.tube {
  position: absolute;
  left: 50%;
  bottom: 0;
  display: grid;
  place-items: center;
  width: 116px;
  height: 146px;
  border-radius: 8px 8px 16px 16px;
  background: var(--seal);
  transform: translateX(-50%);
}

.tube-label {
  padding: 0.7rem 0.35rem;
  border: 1.5px solid rgba(250, 250, 245, 0.8);
  color: var(--paper);
  font-family: var(--hand);
  font-size: 1.8rem;
  line-height: 1;
  letter-spacing: 0.15em;
  writing-mode: vertical-rl;
}

.slip { max-width: 440px; }

.slip-title {
  margin: 0 0 0.4rem;
  color: var(--pencil);
}

.slip-text {
  min-height: 1.3em;
  margin: 0 0 1.4rem;
  font-size: clamp(1.9rem, 5vw, 2.5rem);
  line-height: 1.3;
}

/* ---------- 结尾 ---------- */

.end {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.6rem 1.5rem;
  margin-top: clamp(88px, 12vw, 140px);
  padding-top: 1.6rem;
  border-top: 1.5px solid var(--grid);
}

.end .hand {
  margin: 0;
  font-size: 2.1rem;
}

.end small {
  color: var(--pencil);
  font-size: 0.88rem;
}

/* config.js 出错时的提示 */
.config-error {
  max-width: 640px;
  margin: 24px auto;
  padding: 16px 20px;
  border: 2px solid var(--seal);
  background: var(--white);
  color: var(--seal);
}

/* ---------- 小屏幕 ---------- */

@media (max-width: 560px) {
  body { font-size: 16px; }
  .sign { padding-right: 92px; }
  .seal { width: 70px; height: 70px; }
  .day-name { font-size: 1.5rem; }
  .day-num { font-size: 2.2rem; }
  .tab { font-size: 1.55rem; }
}

/* 系统设置了"减少动态效果"时，关掉动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}