/* ============================================================
   时光档案馆 · 二周年 —  总站新增样式
   依赖 assets/styles.css 的设计 token（羊皮纸 / 鞍棕 / 衬线）
   仅在根目录 index.html 使用
   ============================================================ */

/* ---------- A. 序言补充 ---------- */
.intro-lead{
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 2.1;
  letter-spacing: .1em;
  color: var(--saddle-deep);
  text-align: center;
}

.intro-body{
  margin: 22px 0 26px;
  font-family: var(--serif);
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 2;
  letter-spacing: .12em;
  color: var(--saddle-deep);
  text-align: center;
  white-space: pre-wrap;
}
.intro-body:empty{ display: none; }

.intro-rules{
  margin: 0 0 26px;
  padding: 18px 20px 18px 38px;
  border-top: 2px solid rgba(139,69,19,.28);
  border-bottom: 2px solid rgba(139,69,19,.28);
  font-size: 13px;
  line-height: 2.1;
  letter-spacing: .05em;
  color: var(--ink-80);
}
.intro-rules li{ margin: 2px 0; }
.intro-rules li::marker{ color: var(--saddle); }

/* ---------- B. 密钥册 ---------- */
.keybook{
  margin: 0 0 30px;
  padding: 24px 20px 20px;
}

@media (min-width: 768px){
  .keybook{ padding: 30px 32px 26px; }
}

.keybook-head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.keybook-head .eyebrow{ margin: 0; }

.keybook-title{
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--saddle);
}

.key-strip{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.key-chip{
  position: relative;
  flex: 1 1 96px;
  min-width: 0;
  padding: 10px 6px 9px;
  border: 2px solid rgba(139,69,19,.4);
  background-color: rgba(240,223,199,.6);
  text-align: center;
  overflow: hidden;
  transition: border-color .5s var(--ease), background-color .5s var(--ease);
}

.key-chip .chip-idx{
  display: block;
  font-size: 9px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-bottom: 2px;
}

.key-chip .chip-code{
  display: block;
  font-family: var(--serif);
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 700;
  letter-spacing: .18em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-60);
  white-space: nowrap;
}

.key-chip.is-collected{
  border-color: var(--saddle);
  background-color: #fbf1e2;
}
.key-chip.is-collected .chip-code{ color: var(--saddle-deep); }
.key-chip.is-collected .chip-idx{ color: var(--saddle); }

/* 新到手的一段：翻转 + 光泽扫过 */
.key-chip.is-new{
  animation: keyChipIn 900ms cubic-bezier(.2,.8,.3,1) both;
}
.key-chip.is-new::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 30%, rgba(255,255,255,.72) 48%, transparent 66%);
  transform: translateX(-120%);
  animation: keyShine 1200ms ease-out 260ms both;
  pointer-events: none;
}

@keyframes keyChipIn{
  0%   { transform: rotateY(-92deg) scale(.86); opacity: .2; }
  55%  { transform: rotateY(12deg)  scale(1.04); opacity: 1; }
  100% { transform: rotateY(0)      scale(1); }
}
@keyframes keyShine{
  0%   { transform: translateX(-120%); }
  100% { transform: translateX(120%); }
}

.keybook-foot{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 2px solid rgba(139,69,19,.22);
}

.keybook-note{
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-70);
}

.keybook.is-ready{
  border-color: var(--saddle-deep);
  box-shadow: 0 0 0 2px rgba(212,163,115,.55), var(--shadow-m);
}
.keybook.is-ready .keybook-title{ color: var(--saddle-deep); }

.btn-pulse{ animation: btnPulse 2200ms ease-in-out infinite; }
@keyframes btnPulse{
  0%, 100% { box-shadow: 0 0 0 0 rgba(139,69,19,.35); }
  50%      { box-shadow: 0 0 0 7px rgba(139,69,19,0); }
}

/* ---------- C. 关卡卡片：未解锁全用「？？？」隐匿 ---------- */
.lv-badges{
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.grade-badge{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 2px solid var(--forest);
  background-color: #eef0e9;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  color: var(--forest);
}

.grade-badge[data-grade="S"]{ border-color: #6b6b47; color: #6b6b47; background-color: #f0edda; }
.grade-badge[data-grade="A"]{ border-color: var(--forest); color: var(--forest); }
.grade-badge[data-grade="B"]{ border-color: var(--saddle); color: var(--saddle); background-color: #f7ecd9; }
.grade-badge[data-grade="C"]{ border-color: var(--ink-70); color: var(--ink-70); background-color: #f4ece0; }
.grade-badge[data-grade="D"]{ border-color: var(--rust); color: var(--rust); background-color: #f8e9e4; }

.lv-rule{
  margin: 2px 0 0;
  padding: 8px 12px;
  border-left: 3px solid var(--amber);
  background-color: rgba(232,213,192,.34);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .06em;
  color: var(--ink-80);
}
.lv-rule b{ color: var(--saddle-deep); }

/* 遮罩文本 */
.masked-text{
  color: var(--ink-60);
  letter-spacing: .34em;
  -webkit-user-select: none;
  user-select: none;
}
.lv-title.masked-text{ letter-spacing: .3em; }
.lv-desc.masked-text{ letter-spacing: .2em; }

/* 快照被 ? 遮住 */
.level-card.is-locked .revealable{ filter: grayscale(.85) sepia(.18); }

/* 第 1 / 2 关改用实机截图快照：铺满相框，轻微做旧以贴合纸张风格 */
.snapshot .snap-img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: sepia(.18) saturate(.92) brightness(.97) contrast(1.02);
  transition: filter var(--t) var(--ease);
}
.level-card:hover .snap-img{
  filter: sepia(.1) saturate(1) brightness(1);
}

.snapshot.is-masked{
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #ecdfcc;
  color: rgba(92,46,10,.42);
  border-style: dashed;
  border-color: rgba(139,69,19,.45);
}
.snapshot.is-masked .mask-glyphs{
  font-family: var(--serif);
  font-size: clamp(38px, 7vw, 58px);
  font-weight: 700;
  letter-spacing: .18em;
  line-height: 1;
  animation: maskBreath 5.2s ease-in-out infinite;
}
@keyframes maskBreath{
  0%, 100% { opacity: .42; }
  50%      { opacity: .72; }
}

/* 刚解锁：内容替换后的亮相 */
.level-card.unlocked-flash{ animation: cardFlash 900ms ease-out both; }
@keyframes cardFlash{
  0%   { box-shadow: 0 0 0 3px rgba(212,163,115,.9), var(--shadow-s); }
  100% { box-shadow: 0 0 0 0 rgba(212,163,115,0), var(--shadow-s); }
}
.level-card.unlocked-flash .level-inner{ animation: contentIn 700ms ease-out both; }
@keyframes contentIn{
  0%   { opacity: .15; filter: blur(6px); transform: translateY(6px); }
  100% { opacity: 1; filter: none; transform: none; }
}

/* ---------- D. 信：密钥输入 ---------- */
.letter-gate{
  padding: 34px 20px 30px;
}

.letter-gate-sub{
  margin: 10px 0 24px;
  font-size: 13px;
  line-height: 1.9;
  letter-spacing: .1em;
  color: var(--ink-80);
  text-align: center;
}

.key-inputs{
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  gap: 4px;
  max-width: 780px;
  margin: 0 auto 10px;
}

.key-input{
  flex: 1 1 0;
  min-width: 0;
  max-width: 104px;
  padding: 12px 2px;
  border: 2px solid var(--saddle);
  background-color: var(--parchment-4);
  font-family: var(--serif);
  font-size: clamp(15px, 2.4vw, 19px);
  font-weight: 700;
  letter-spacing: .14em;
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--saddle-deep);
  transition: background-color .3s var(--ease), border-color .3s var(--ease);
}
.key-input::placeholder{ color: rgba(122,74,30,.4); letter-spacing: .1em; font-weight: 400; }
.key-input:focus{
  outline: 2px solid var(--saddle-deep);
  outline-offset: 2px;
  background-color: #fdf6ec;
}
.key-input.is-filled{ background-color: #fbf1e2; border-color: var(--saddle-deep); }
.key-input.is-invalid{ border-color: var(--rust); background-color: #f8e9e4; }

.key-sep{
  font-size: 16px;
  color: var(--ink-60);
  line-height: 1;
  padding: 0 1px;
}

#letter-error:not(:empty){
  margin: 6px 0 16px;
  text-align: center;
}

/* ---------- E. 信纸 ---------- */
.letter{
  margin: 10px 0 0;
  animation: letterOpen 1100ms cubic-bezier(.2,.8,.3,1) both;
}

@keyframes letterOpen{
  0%   { opacity: 0; transform: translateY(26px) scale(.97); }
  60%  { opacity: 1; }
  100% { opacity: 1; transform: none; }
}

.letter-inner{
  position: relative;
  padding: 46px 26px 34px;
  border: 2px solid var(--saddle);
  background-color: #fbf3e6;
  background-image: var(--noise);
  box-shadow: var(--shadow-l);
  overflow: hidden;
}

@media (min-width: 768px){
  .letter-inner{ padding: 58px 64px 46px; }
}

/* 信纸折痕 */
.letter-inner::before{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to bottom,
      transparent calc(33.33% - 1px), rgba(139,69,19,.14) 33.33%, transparent calc(33.33% + 1px)),
    linear-gradient(to bottom,
      transparent calc(66.66% - 1px), rgba(139,69,19,.14) 66.66%, transparent calc(66.66% + 1px));
}

.letter-eyebrow{
  margin: 0 0 14px;
  font-size: 10px;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--ink-60);
  text-align: center;
}

.letter-title{
  margin: 0 0 26px;
  font-family: var(--serif);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--saddle-deep);
  text-align: center;
}

.letter-body{
  font-family: var(--serif);
  font-size: 15px;
  line-height: 2.25;
  letter-spacing: .05em;
  color: var(--saddle-deep);
}
.letter-body p{
  margin: 0 0 1.15em;
  text-indent: 2em;
  white-space: pre-wrap;
}
.letter-body p:last-child{ margin-bottom: 0; }

.letter-body .caret{
  display: inline-block;
  width: .55em;
  height: 1.05em;
  margin-left: 1px;
  vertical-align: -.16em;
  background-color: var(--saddle);
  animation: caretBlink 900ms steps(1) infinite;
}
@keyframes caretBlink{
  0%, 49%  { opacity: 1; }
  50%, 100%{ opacity: 0; }
}

.letter-pickup{
  margin: 30px auto 26px;
  max-width: 420px;
  padding: 22px 18px 18px;
  border: 2px dashed var(--saddle);
  background-color: rgba(240,223,199,.66);
  text-align: center;
  animation: pickupIn 900ms cubic-bezier(.2,.8,.3,1) both;
  animation-delay: 80ms;
}

@keyframes pickupIn{
  0%   { opacity: 0; transform: scale(1.14) rotate(-1.6deg); }
  70%  { opacity: 1; transform: scale(.985) rotate(.4deg); }
  100% { opacity: 1; transform: none; }
}

.pickup-label{
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: .44em;
  text-transform: uppercase;
  color: var(--saddle);
}

.pickup-code{
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  letter-spacing: .24em;
  line-height: 1.3;
  color: var(--saddle-deep);
  word-break: break-all;
}

.pickup-note{
  margin: 0;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-70);
}

.letter-sign{
  margin: 26px 0 0;
  font-size: 15px;
  letter-spacing: .14em;
  color: var(--saddle-deep);
  text-align: right;
}

/* ---------- D0. 首次登录的通讯（NOTICE） ---------- */
.shell-narrow{ max-width: 780px; }

.notice{
  position: relative;
  margin: 34px 0 26px;
  padding: 44px 26px 34px;
  animation: noticeIn 900ms cubic-bezier(.2,.8,.3,1) both;
}

@keyframes noticeIn{
  from{ opacity: 0; transform: translateY(18px); }
  to{ opacity: 1; transform: none; }
}

.notice-head{ text-align: center; }

.notice-title{
  margin: 8px 0 14px;
  font-family: var(--serif);
  font-size: clamp(34px, 6vw, 54px);
  font-weight: 700;
  letter-spacing: .32em;
  color: var(--saddle-deep);
}

.notice-to{
  margin: 0;
  font-size: 12px;
  letter-spacing: .34em;
  color: var(--ink-70);
}

.notice-rule{
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 24px;
  color: var(--ink-60);
}
.notice-rule span{ flex: 1 1 auto; height: 1px; background-color: rgba(139,69,19,.3); }
.notice-rule i{ font-style: normal; font-size: 11px; line-height: 1; }

.notice-greeting{
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--saddle-deep);
}

.notice-body p{
  margin: 0 0 1.1em;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 2.1;
  letter-spacing: .05em;
  color: var(--saddle-deep);
  text-indent: 2em;
}
.notice-body p:last-child{ margin-bottom: 0; }

.notice-closing{
  margin: 26px 0 32px;
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: .14em;
  color: var(--saddle-deep);
  text-align: right;
}

.notice-stamp{
  position: absolute;
  top: 26px;
  right: 22px;
  padding: 10px 12px;
  transform: rotate(11deg);
  border: 2px solid rgba(201,76,76,.55);
  color: rgba(201,76,76,.72);
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .26em;
  text-transform: uppercase;
  opacity: .85;
  pointer-events: none;
}

@media (max-width: 520px){
  .notice{ padding: 38px 18px 26px; }
  .notice-stamp{
    position: static;
    display: block;
    width: max-content;
    margin: 0 4px 16px auto;
    font-size: 10px;
    padding: 6px 9px;
    transform: rotate(-4deg);
  }
}

/* ---------- E2. 复古信封（拆信交互） ---------- */
.envelope-scene{
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100dvh - 300px);
  padding: 12px 0 18px;
  animation: envSceneIn 700ms ease-in-out both;
}

@keyframes envSceneIn{
  from{ opacity: 0; }
  to{ opacity: 1; }
}

.envelope{
  position: relative;
  width: min(560px, 92vw);
  padding: 0 0 6px;
  cursor: pointer;
  text-align: center;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}
.envelope:focus-visible .env-body{
  outline: 2px solid var(--rust);
  outline-offset: 6px;
}

.env-shadow{
  position: absolute;
  left: 9%;
  right: 9%;
  bottom: 40px;
  height: 30px;
  background: radial-gradient(ellipse at center, rgba(92,46,10,.26), rgba(92,46,10,0) 72%);
  pointer-events: none;
}

.env-body{
  position: relative;
  aspect-ratio: 1.62 / 1;
  background-color: #efe2ca;
  background-image: var(--noise);
  border: 2px solid var(--saddle);
  box-shadow: var(--shadow-m);
  perspective: 1200px;
  transform-style: preserve-3d;
  overflow: hidden;
}

/* 欧洲复古航空信封：上下红蓝斜纹边 */
.env-body::before{
  content: "";
  position: absolute;
  inset: 0;
  z-index: 8;
  pointer-events: none;
  background:
    repeating-linear-gradient(45deg,
      rgba(201,76,76,.55) 0 7px, rgba(245,230,211,0) 7px 14px,
      rgba(46,74,63,.5) 14px 21px, rgba(245,230,211,0) 21px 28px)
      0 0 / 100% 7px no-repeat,
    repeating-linear-gradient(45deg,
      rgba(201,76,76,.55) 0 7px, rgba(245,230,211,0) 7px 14px,
      rgba(46,74,63,.5) 14px 21px, rgba(245,230,211,0) 21px 28px)
      0 100% / 100% 7px no-repeat;
  opacity: .8;
}

/* 里面露出的信纸边 */
.env-peek{
  position: absolute;
  left: 13%;
  right: 13%;
  top: 5%;
  height: 74%;
  background-color: #fbf3e6;
  background-image: var(--noise);
  border: 1px solid rgba(139,69,19,.4);
  box-shadow: 0 2px 10px rgba(92,46,10,.16) inset;
  transform: translateY(16%);
  opacity: 0;
  transition: transform 900ms cubic-bezier(.3,.8,.3,1), opacity 700ms ease-in-out;
  z-index: 2;
}
.env-peek-line{
  display: block;
  height: 2px;
  margin: 16px 22px 0;
  background-color: rgba(139,69,19,.22);
}
.env-peek-line.is-short{ width: 52%; }

/* 信封盖（上翻的三角） */
.env-flap{
  position: absolute;
  left: -2px;
  right: -2px;
  top: -2px;
  height: 62%;
  background-color: #e6d4b2;
  background-image: var(--noise);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transition: transform 820ms cubic-bezier(.45,.05,.25,1);
  z-index: 3;
}
/* 开信后：信封盖淡出藏到背后，信纸从信封里升出来（不再出现三角盖穿纸的错觉） */
.is-open .env-body{ overflow: visible; }
.is-open .env-flap{
  transform: rotateX(176deg);
  opacity: 0;
  transition: transform 820ms cubic-bezier(.45,.05,.25,1), opacity 320ms ease 420ms;
}
.is-open .env-peek{
  transform: translateY(-46%);
  opacity: 1;
  z-index: 2;
  border-top: 1px solid rgba(139,69,19,.28);
  box-shadow: 0 -10px 26px rgba(92,46,10,.2);
}
.is-out .env-peek{ transform: translateY(-160%); opacity: 0; }

/* 信封正面（下半部分） */
.env-face{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 24%;
  background-color: #f4e8d4;
  background-image: var(--noise);
  border-top: 1px solid rgba(139,69,19,.35);
  z-index: 4;
}
.env-face::before{
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom right, transparent calc(50% - 1px), rgba(139,69,19,.18) 50%, transparent calc(50% + 1px)),
    linear-gradient(to bottom left, transparent calc(50% - 1px), rgba(139,69,19,.18) 50%, transparent calc(50% + 1px));
  opacity: .7;
  pointer-events: none;
}

/* 邮票 */
.env-stamp{
  position: absolute;
  top: 12px;
  right: 14px;
  width: 74px;
  height: 88px;
  padding: 8px 6px 6px;
  background-color: #f7efe0;
  border: 1px dashed rgba(139,69,19,.65);
  box-shadow: 0 0 0 4px #f7efe0, 0 1px 6px rgba(92,46,10,.18);
  text-align: center;
  transform: rotate(2.5deg);
}
.env-stamp-figure{
  display: block;
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.1;
  color: var(--saddle);
}
.env-stamp-mark{
  display: block;
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--saddle-deep);
}
.env-stamp-year{
  display: block;
  font-size: 8px;
  letter-spacing: .22em;
  color: var(--ink-60);
}

/* 邮戳 */
.env-postmark{
  position: absolute;
  top: 24px;
  right: 102px;
  margin: 0;
  font-size: 9px;
  letter-spacing: .24em;
  color: rgba(139,69,19,.6);
  transform: rotate(-8deg);
}

/* 地址行（左上区，避开右下角蜡封与右上邮票） */
.env-address{
  position: absolute;
  left: 26px;
  top: 18px;
  right: 44%;
  text-align: left;
}
.env-addr-line{
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--saddle-deep);
}
.env-addr-line.is-strong{
  font-size: clamp(14px, 2.4vw, 20px);
  font-weight: 700;
  letter-spacing: .22em;
}
.env-addr-line.is-small{
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--ink-70);
}

/* 火漆封蜡 */
.env-seal{
  position: absolute;
  left: 50%;
  bottom: 16px;
  width: 78px;
  height: 78px;
  margin-left: -39px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, #a4403a 0%, #822b28 46%, #5d1b1a 100%);
  border: 2px solid #4a1413;
  box-shadow: 0 3px 10px rgba(74,20,19,.4), 0 0 0 3px rgba(245,230,211,.35) inset;
  color: #f6e7c8;
  font-family: var(--serif);
  font-size: 32px;
  line-height: 74px;
  text-align: center;
  z-index: 6;
  transition: transform 700ms cubic-bezier(.3,.8,.3,1), opacity 700ms ease-in-out;
}
.env-seal::after{
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  border: 1px dashed rgba(246,231,200,.5);
}
.env-seal-letter{
  display: block;
  font-style: italic;
  transform: rotate(-4deg) translateY(-1px);
}
.is-breaking .env-seal{
  transform: translateY(46px) rotate(26deg) scale(.82);
  opacity: 0;
}

.envelope-hint{
  margin: 18px 0 2px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--saddle-deep);
  transition: color .7s var(--ease);
}
.envelope-sub{
  margin: 6px 0 0;
  font-size: 9px;
  letter-spacing: .3em;
  color: var(--ink-60);
}

/* 信纸副标题 / 尾注 / 超大取件码 */
.letter-subtitle{
  margin: -14px 0 24px;
  font-family: var(--serif);
  font-size: clamp(13px, 1.8vw, 16px);
  font-style: italic;
  letter-spacing: .12em;
  color: var(--saddle);
  text-align: center;
}

.letter-body > p{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.letter-body > p.is-shown{ opacity: 1; transform: none; }
.letter-body .letter-pickup{
  text-indent: 0;
  margin-left: auto;
  margin-right: auto;
}

.pickup-code.is-hero{
  font-family: var(--heiti);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 52px);
  letter-spacing: .04em;
  line-height: 1.3;
  color: #2a1708;
  background-image: linear-gradient(transparent 56%, #f0d18a 56%, #f0d18a 94%, transparent 94%);
  padding: 0 .14em;
  display: inline-block;
  white-space: nowrap;
  word-break: keep-all;
}

.letter-after{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid rgba(139,69,19,.25);
  animation: pickupIn 900ms cubic-bezier(.2,.8,.3,1) both;
}

@media (prefers-reduced-motion: reduce){
  .envelope-scene, .env-flap, .env-peek, .env-seal, .letter-body p{ animation: none !important; transition: none !important; }
  .letter-body p{ opacity: 1 !important; transform: none !important; }
}

/* ---------- F. 奖品总览 ---------- */
.prizes-intro{
  margin: 14px 0 0;
  font-family: var(--serif);
  font-size: 14px;
  line-height: 2;
  letter-spacing: .08em;
  color: var(--ink-80);
  text-align: center;
}

.prize-list{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 30px 0 34px;
}
@media (min-width: 760px){
  .prize-list{ grid-template-columns: 1fr 1fr; gap: 18px 22px; }
  .prize-item:last-child{ grid-column: 1 / -1; }
}

.prize-item{
  position: relative;
  padding: 20px 20px 18px;
  border: 2px solid var(--saddle);
  background-color: var(--parchment-4);
  background-image: var(--noise);
  box-shadow: var(--shadow-s);
}
.prize-item.is-open{
  border-color: var(--forest);
  background-color: #f7efdd;
}
.prize-item.is-open::after{
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(46,74,63,.32);
  pointer-events: none;
}

.prize-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.prize-index{
  font-family: var(--heiti);
  font-size: 10px;
  letter-spacing: .26em;
  color: var(--ink-70);
}

.prize-name{
  margin: 12px 0 6px;
  font-family: var(--serif);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--saddle-deep);
}

.prize-desc{
  margin: 0;
  font-size: 13px;
  line-height: 1.95;
  letter-spacing: .04em;
  color: var(--ink-80);
}

.prize-stage{
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(139,69,19,.35);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-60);
}

.prizes-handbook{
  text-align: center;
}
.prizes-handbook .h2{ margin: 4px 0 12px; }
.prizes-handbook-note{
  margin: 0 auto 22px;
  max-width: 460px;
  font-size: 13px;
  line-height: 1.95;
  letter-spacing: .06em;
  color: var(--ink-80);
}
.prizes-handbook .btn{ display: inline-block; }

.prizes-outro{
  margin: 26px 0 0;
  font-size: 12px;
  line-height: 2;
  letter-spacing: .1em;
  color: var(--ink-70);
  text-align: center;
}

/* ---------- G. 开发者印章（隐藏入口） ---------- */
.dev-seal{
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  background: none;
  padding: 4px 10px;
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1;
  color: rgba(139,69,19,.26);
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
  transition: color .4s var(--ease), transform .4s var(--ease);
}
.dev-seal:focus{ outline: none; }

.dev-seal.is-progress{ color: rgba(139,69,19,.62); }
.dev-seal.is-active{ color: var(--saddle-deep); transform: rotate(-8deg); }

/* 开发模式常驻按钮：只在 ?dev=1 / 开发者模式下出现，交付后 dev.enabled=false 即消失 */
.dev-chip{
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 2147482500;
  appearance: none;
  border: 2px solid var(--saddle);
  border-radius: 0;
  background-color: var(--parchment);
  color: var(--saddle-deep);
  padding: 7px 14px;
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: .22em;
  cursor: pointer;
  box-shadow: var(--shadow-s);
  transition: background-color .7s var(--ease), color .7s var(--ease);
}
.dev-chip:hover{ background-color: var(--parchment-3); color: var(--saddle-deep); }
.dev-chip:focus-visible{ outline: 2px solid var(--rust); outline-offset: 2px; }

/* ---------- H. 开发者面板 ---------- */
.dev-card{
  max-width: 620px;
  text-align: left;
}

.dev-card .modal-title{ text-align: center; }
.dev-card .divider{ margin: 16px 0; }

.dev-status{
  margin: 0 0 16px;
  padding: 10px 12px;
  border: 2px solid rgba(139,69,19,.35);
  background-color: rgba(240,223,199,.6);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: var(--ink-80);
}
.dev-status b{ color: var(--saddle-deep); }
.dev-status .ok{ color: var(--forest); }
.dev-status .off{ color: var(--rust); }

.dev-group{
  margin: 0 0 16px;
}
.dev-group > .label-mini{ margin-bottom: 8px; }

.dev-row{
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.dev-input{
  flex: 1 1 140px;
  min-width: 0;
  padding: 9px 10px;
  border: 2px solid var(--saddle);
  background-color: var(--parchment-4);
  font-family: var(--serif);
  font-size: 14px;
  color: var(--saddle-deep);
  letter-spacing: .1em;
}
.dev-input:focus{ outline: 2px solid var(--saddle-deep); outline-offset: 2px; }

.dev-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

@media (min-width: 560px){
  .dev-grid{ grid-template-columns: 1fr 1fr; }
}

.dev-grid .btn{ width: 100%; }

.dev-hint{
  margin: 10px 0 0;
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--ink-60);
}

.dev-card .modal-close-link{ margin-top: 16px; }

/* ---------- I. 轻提示 ---------- */
.toast{
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 260;
  max-width: min(92vw, 560px);
  padding: 12px 20px;
  border: 2px solid var(--saddle);
  background-color: #fbf1e2;
  background-image: var(--noise);
  box-shadow: var(--shadow-l);
  font-size: 13px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--saddle-deep);
  text-align: center;
  opacity: 0;
  transform: translate(-50%, 14px);
  pointer-events: none;
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}
.toast.is-shown{
  opacity: 1;
  transform: translate(-50%, 0);
}

.modal-close-link{ margin-top: 12px; }

/* 弹窗里连续按钮的间距 */
.modal-card .btn + .btn-block{ margin-top: 10px; }

/* 不合格时的抖动 */
@keyframes gateShake{
  0%, 100% { transform: translateX(0); }
  15%      { transform: translateX(-7px); }
  32%      { transform: translateX(6px); }
  50%      { transform: translateX(-5px); }
  68%      { transform: translateX(4px); }
  84%      { transform: translateX(-2px); }
}

/* 仅屏幕阅读器可见 */
.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;
}

/* 已完成的卡片：边框略深 */
.level-card.is-done{
  border-color: var(--forest);
  background-color: #f2ead9;
}
.level-card.is-done .lv-desc{ color: var(--ink-70); }

/* 蜡封页排版 */
.letter-gate .h2{ text-align: center; }
.letter-gate .eyebrow{ text-align: center; }
.key-sep{ flex: 0 0 auto; }
#btn-letter-verify{
  display: block;
  max-width: 420px;
  margin: 4px auto 0;
}

/* ---------- J. 小屏 ---------- */
@media (max-width: 640px){
  .key-inputs{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px 6px; }
  .key-sep{ display: none; }
  .key-input{ max-width: none; }
}

@media (max-width: 480px){
  /* 七段密钥在小屏排成 4 + 3 两行，比「3+3+1」更整齐 */
  .key-strip{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .key-chip{ flex: none; }
  .key-input{ padding: 10px 1px; letter-spacing: .08em; }
  .letter-inner{ padding: 34px 18px 26px; }
  .letter-body{ font-size: 14px; line-height: 2.1; }
  .letter-body p{ text-indent: 1.4em; }
  .keybook-head{ flex-direction: column; align-items: flex-start; }
  .prize-item{ padding: 16px 16px 14px; }
  #btn-letter-verify{ max-width: none; }
}

/* ============================================================
   隐秘入口 · 密钥弹窗 / 加载动画 / 礼物小记信
   ============================================================ */

.secret-card{ max-width: 460px; text-align: center; }
.secret-field{ margin: 6px 0 4px; }
.secret-field .input{ text-align: center; letter-spacing: .3em; }
.secret-card .error{ min-height: 1.4em; }

/* 加载过渡：整页羊皮纸 + 转动的蜡封 */
.secret-loading{
  position: fixed; inset: 0; z-index: 2147482000;
  display: flex; align-items: center; justify-content: center;
  background-color: var(--parchment);
  background-image: var(--noise);
}
.secret-loading-inner{ text-align: center; }
.secret-seal{
  display: inline-flex; align-items: center; justify-content: center;
  width: 84px; height: 84px; border-radius: 50%;
  font-family: var(--serif); font-size: 30px; font-weight: 700;
  color: #f0dcc4; background: radial-gradient(circle at 34% 30%, #a8443d, #6f2420);
  box-shadow: inset 0 0 0 6px rgba(240,220,196,.16), var(--shadow-m);
  animation: secretSealSpin 2.4s linear infinite;
}
@keyframes secretSealSpin{ from{ transform: rotate(0deg); } to{ transform: rotate(360deg); } }
.secret-loading-text{
  margin: 22px 0 14px; font-family: var(--serif); letter-spacing: .28em;
  font-size: 13px; color: var(--ink-70);
}
.secret-bar{
  width: 240px; height: 4px; margin: 0 auto;
  background-color: var(--parchment-3); border: 1px solid var(--parchment-2);
}
.secret-bar span{ display: block; height: 100%; width: 0; background-color: var(--saddle); transition: width .2s linear; }

/* 礼物小记整页层 */
html.is-gift-letter, html.is-gift-letter body{ overflow: hidden; }
.gift-letter-layer{
  position: fixed; inset: 0; z-index: 2147482100;
  overflow-y: auto; -webkit-overflow-scrolling: touch;
  padding: 34px 20px 60px;
  background-color: var(--parchment);
  background-image: var(--noise);
}
.gift-letter-close{
  position: fixed; top: 16px; right: 16px; z-index: 2147482101;
  appearance: none; border: 2px solid var(--saddle); border-radius: 0;
  background-color: var(--parchment); color: var(--saddle-deep);
  width: 40px; height: 40px; font-family: var(--serif); font-size: 16px;
  cursor: pointer; transition: background-color .7s var(--ease);
}
.gift-letter-close:hover{ background-color: var(--parchment-3); }
.gift-envelope-scene{ min-height: calc(100dvh - 120px); }
.gift-letter-sheet{ max-width: 880px; margin: 0 auto; }
.gift-letter-sheet .letter-body p{ opacity: 0; transform: translateY(10px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.gift-letter-sheet .letter-body p.is-shown{ opacity: 1; transform: none; }

@media (max-width: 560px){
  .gift-letter-layer{ padding: 20px 12px 40px; }
  .gift-letter-close{ top: 10px; right: 10px; width: 34px; height: 34px; }
}

/* 礼物小记信封：小屏收紧排版（避免蜡封压住地址行） */
@media (max-width: 560px){
  .gift-letter-layer .env-address{ left: 14px; top: 12px; right: 33%; }
  .gift-letter-layer .env-addr-line.is-strong{ font-size: 15px; letter-spacing: .1em; }
  .gift-letter-layer .env-addr-line{ font-size: 10px; letter-spacing: .04em; margin-top: 5px; }
  .gift-letter-layer .env-seal{ width: 56px; height: 56px; bottom: 10px; }
  .gift-letter-layer .env-seal-letter{ font-size: 20px; }
  .gift-letter-layer .env-postmark{ font-size: 9px; letter-spacing: .12em; }
  .gift-letter-layer .env-stamp{ width: 54px; height: 66px; right: 12px; top: 12px; }
  .gift-letter-layer .env-stamp-mark{ font-size: 16px; }
  .gift-letter-layer .env-stamp-year{ font-size: 7px; }
  .gift-letter-layer .envelope-hint{ font-size: 12px; letter-spacing: .06em; }
}

/* ---------- 信件内的下载链接（礼物小记里的 APK 等） ---------- */
.letter-body a.letter-link{
  color: var(--saddle-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color .7s var(--ease);
}
.letter-body a.letter-link:hover{ color: var(--rust); }
.letter-body a.letter-link:focus-visible{ outline: 2px solid var(--rust); outline-offset: 2px; }

/* ---------- 奖品总览：额外礼物 / 建议自购 ---------- */
.prizes-extra{ margin: 38px 0 10px; }
.prizes-extra .h2{ margin: 8px 0 10px; }
.prizes-extra .eyebrow{ margin-bottom: 0; }
.prizes-extra-note{ margin: 0 0 20px; color: var(--ink-70); font-size: 14px; line-height: 1.9; }
.prize-list--extra{ margin-top: 0; }
.prize-pic{
  margin: 14px 0 16px;
  border: 2px solid rgba(139,69,19,.32);
  background-color: #fbf4e8;
  overflow: hidden;
}
.prize-pic img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  transition: transform 900ms var(--ease);
}
.prize-item--extra:hover .prize-pic img{ transform: scale(1.025); }
@media (prefers-reduced-motion: reduce){
  .prize-item--extra:hover .prize-pic img{ transform: none; }
}

/* ================= 关卡总览 v2：整页背景 + 一卡错落 + 图钉连线 ================= */
#view-board{
  background-image:
    linear-gradient(180deg, rgba(245,230,211,.94), rgba(240,223,199,.91)),
    url("board-bg.jpg");
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
  background-repeat: no-repeat;
}
#view-board .page-head,
#view-board .keybook{ position: relative; z-index: 1; }
#view-board .board-foot{ justify-content: flex-end; }
#level-list{
  position: relative;
  display: block;
  margin: 22px 0 12px;
  padding: 42px clamp(16px, 3vw, 48px) 26px;
  background-color: rgba(250,243,231,.9);
  border: 2px solid var(--saddle);
  box-shadow: var(--shadow-m);
  min-height: 1000px;
}
#level-list::after{
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(139,69,19,.25);
  pointer-events: none;
}
.board-map{ position: relative; }
.board-map-line{
  position: absolute;
  left: 50%;
  top: 24px;
  bottom: 26px;
  width: 160px;
  transform: translateX(-50%);
  pointer-events: none;
  opacity: .6;
}
.board-map-line svg{ display: block; width: 100%; height: 100%; }
.map-node{
  position: absolute;
  top: 0;
  display: block;
  width: calc(50% - 74px);
  max-width: 430px;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  box-shadow: none;
}
.map-node.is-left{ right: calc(50% + 56px); }
.map-node.is-right{ left: calc(50% + 56px); }
.map-node[data-level="1"]{ top: 18px; }
.map-node[data-level="2"]{ top: 168px; }
.map-node[data-level="3"]{ top: 318px; }
.map-node[data-level="4"]{ top: 468px; }
.map-node[data-level="5"]{ top: 618px; }
.map-node[data-level="6"]{ top: 768px; }
.map-node[data-level="7"]{ top: 918px; }
.map-node:hover{ transform: none; box-shadow: none; }
.map-node > .level-inner{
  display: flex;
  gap: 12px;
  align-items: flex-start;
  height: 138px;
  padding: 12px 14px;
  background-color: rgba(251,245,234,.95);
  border: 2px solid var(--saddle);
  box-shadow: var(--shadow-s);
  transition: background-color .7s var(--ease), box-shadow .7s var(--ease);
}
.map-node:hover > .level-inner{ background-color: rgba(255,250,241,.98); box-shadow: var(--shadow-m); }
.map-node.is-left > .level-inner{ flex-direction: row-reverse; }
.map-node .snapshot-wrap{ position: relative; flex: 0 0 112px; margin: 0; padding: 3px; }
.map-node .snapshot{ aspect-ratio: 4 / 3; }
.map-node .snap-svg,
.map-node .snapshot .snap-img{ width: 100%; height: 100%; }
.map-node .pin{ position: absolute; top: -16px; z-index: 3; }
.map-node.is-left .pin{ right: -13px; }
.map-node.is-right .pin{ left: -13px; }
.map-node .meta{ min-width: 0; flex: 1; display: flex; flex-direction: column; gap: 3px; }
.map-node.is-left .meta{ align-items: flex-end; text-align: right; }
.map-node .lv-index{ font-size: 10.5px; letter-spacing: .14em; }
.map-node .lv-title{ margin: 2px 0 0; font-size: 18px; line-height: 1.25; }
.map-node .lv-sub{ max-width: 24ch; font-size: 11.5px; line-height: 1.45; }
.map-node .lv-rule{ margin: 2px 0 0; padding: 3px 7px; font-size: 10.5px; line-height: 1.4; }
.map-node .lv-desc{ display: none; }
.map-node .enter-btn{
  margin-top: auto;
  align-self: flex-start;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: .05em;
}
.map-node.is-left .enter-btn{ align-self: flex-end; }
.map-node .status-tag,
.map-node .grade-badge{ padding: 1px 6px; font-size: 10px; }
@media (max-width: 900px){
  #level-list{ min-height: 0; padding: 28px 16px 20px 44px; }
  .board-map-line{ display: none; }
  .map-node{
    position: static;
    width: auto;
    max-width: none;
    margin: 0 0 18px;
  }
  .map-node.is-left,
  .map-node.is-right{ right: auto; left: auto; }
  .map-node > .level-inner{ height: auto; flex-direction: row !important; }
  .map-node.is-left .meta{ align-items: flex-start; text-align: left; }
  .map-node.is-left .enter-btn{ align-self: flex-start; }
  .map-node .pin{ left: -30px !important; right: auto !important; top: 4px; }
  #level-list::before{
    content: "";
    position: absolute;
    left: 22px;
    top: 28px;
    bottom: 20px;
    border-left: 2px dashed rgba(139,69,19,.45);
  }
}
@media (max-width: 560px){
  .map-node > .level-inner{ gap: 9px; padding: 10px; }
  .map-node .snapshot-wrap{ flex: 0 0 84px; }
  .map-node .lv-title{ font-size: 16px; }
}

/* ---------- 关卡总览：错落图钉 + 动态连线（v2 定稿） ---------- */
#view-board{
  background-image: linear-gradient(rgba(245,230,211,.90), rgba(240,223,199,.86)), url("board-bg.jpg");
  background-size: cover;
  background-position: center 38%;
  background-attachment: fixed;
}
#level-list{ min-height: 1560px; padding: 38px 40px 54px; }
#level-list .board-map{ position: relative; height: 1490px; }
#level-list .board-map-line{ display: none; }
#level-list svg.board-connector{
  position: absolute; left: 0; top: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; overflow: visible;
}
#level-list .map-node{
  position: absolute; z-index: 1; margin: 0; padding: 0;
  width: min(432px, calc(50% - 92px)); height: 152px;
}
#level-list .map-node.is-left{ right: calc(50% + 74px); }
#level-list .map-node.is-right{ left: calc(50% + 74px); }
#level-list .map-node[data-level="1"]{ top: 14px; }
#level-list .map-node[data-level="2"]{ top: 226px; }
#level-list .map-node[data-level="3"]{ top: 438px; }
#level-list .map-node[data-level="4"]{ top: 650px; }
#level-list .map-node[data-level="5"]{ top: 862px; }
#level-list .map-node[data-level="6"]{ top: 1074px; }
#level-list .map-node[data-level="7"]{ top: 1286px; }
#level-list .map-node > .level-inner{
  height: 100%; display: flex; align-items: center; gap: 16px;
  padding: 16px 20px; grid-template-columns: none;
}
#level-list .map-node .snapshot-wrap{
  width: 118px; height: 118px; min-width: 118px;
  border: 2px solid var(--saddle); background-color: #efe3cf;
}
#level-list .map-node .snapshot{ width: 100%; height: 100%; aspect-ratio: auto; }
#level-list .map-node .snapshot svg{ width: 100%; height: 100%; }
#level-list .map-node .pin{ top: 50%; transform: translateY(-50%); }
#level-list .map-node.is-left .pin{ right: -11px; left: auto; }
#level-list .map-node.is-right .pin{ left: -11px; right: auto; }
#level-list .map-node .meta{ flex: 1; min-width: 0; padding: 0; }
#level-list .map-node .meta-top{ margin-bottom: 3px; align-items: center; }
#level-list .map-node .lv-index{ font-size: 10px; letter-spacing: .1em; }
#level-list .map-node .lv-title{ font-size: 19px; margin: 1px 0 2px; }
#level-list .map-node .lv-sub{
  font-size: 11.5px; margin: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#level-list .map-node .lv-rule{
  font-size: 10.5px; margin: 5px 0 7px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#level-list .map-node .lv-desc{ display: none; }
#level-list .map-node .enter-btn{ padding: 5px 12px; font-size: 11px; letter-spacing: .08em; }
#level-list .map-node .status-tag{ font-size: 10px; padding: 2px 6px; }
#level-list .map-node .grade-badge{ font-size: 12px; padding: 1px 5px; }

@media (max-width: 900px){
  #level-list{ min-height: 0; padding: 26px 18px 34px; }
  #level-list .board-map{ height: auto; }
  #level-list svg.board-connector{ display: none; }
  #level-list .map-node{
    position: relative; width: 100%; height: auto; margin: 14px 0;
    left: auto; right: auto; top: auto !important;
  }
  #level-list .map-node[data-level="1"], #level-list .map-node[data-level="2"],
  #level-list .map-node[data-level="3"], #level-list .map-node[data-level="4"],
  #level-list .map-node[data-level="5"], #level-list .map-node[data-level="6"],
  #level-list .map-node[data-level="7"]{ top: auto; }
  #level-list .map-node > .level-inner{ padding: 14px; }
  #level-list .map-node .snapshot-wrap{ width: 96px; height: 96px; min-width: 96px; }
  #level-list .map-node .pin{ top: 22px; transform: none; }
  #level-list .map-node.is-left .pin, #level-list .map-node.is-right .pin{ left: -11px; right: auto; }
  #level-list .map-node .lv-sub{ white-space: normal; }
  #level-list .map-node .lv-rule{ white-space: normal; }
}

/* ---------- 关卡总览：手机端纠偏（覆盖 .is-left/.is-right 的定位） ---------- */
@media (max-width: 900px){
  #level-list .map-node.is-left,
  #level-list .map-node.is-right{
    position: relative; left: auto; right: auto; top: auto !important;
    width: 100%; height: auto; margin: 14px 0;
  }
  #level-list .map-node.is-left .pin,
  #level-list .map-node.is-right .pin{ left: -11px; right: auto; top: 22px; transform: none; }
}

/* 快递单号：可点击复制 */
.pickup-code.is-copyable{ cursor:copy; }
.pickup-code.is-copyable:hover{ color:var(--saddle); text-decoration:underline; text-underline-offset:.12em; }
.pickup-code.is-copyable:focus-visible{ outline:2px dashed var(--saddle); outline-offset:8px; }

/* ---------- 信件照片墙（礼物小记） ---------- */
.letter-gallery{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 26px 0 8px;
}
.letter-gallery-item{ margin: 0; }
.letter-gallery-btn{
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid rgba(139,69,19,.42);
  background-color: #efe3cd;
  cursor: zoom-in;
  overflow: hidden;
  transition: border-color .7s var(--ease), transform .7s var(--ease);
}
.letter-gallery-btn:hover{ border-color: var(--saddle); transform: translateY(-2px); }
.letter-gallery-btn:focus-visible{ outline: 2px solid var(--rust); outline-offset: 2px; }
.letter-gallery-btn img{
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.letter-gallery-item figcaption{
  margin-top: 5px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--ink-70);
  text-align: center;
  letter-spacing: .02em;
}

/* ---------- 照片放大预览 ---------- */
html.is-photo-lightbox, html.is-photo-lightbox body{ overflow: hidden; }
.photo-lightbox{
  position: fixed;
  inset: 0;
  z-index: 2147483000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 54px 18px 26px;
  background-color: rgba(26,14,5,.9);
}
.photo-lightbox[hidden]{ display: none; }
.photo-lightbox figure{
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 100%;
}
.photo-lightbox img{
  display: block;
  max-width: min(94vw, 1120px);
  max-height: 80vh;
  object-fit: contain;
  border: 2px solid var(--parchment);
  background-color: #fff;
  box-shadow: 0 24px 60px rgba(0,0,0,.55);
}
.photo-lightbox figcaption{
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .08em;
  color: #f0e2cb;
}
.photo-lightbox figcaption[hidden]{ display: none; }
.photo-lightbox-close{
  position: fixed;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  appearance: none;
  border: 2px solid #f0e2cb;
  background-color: transparent;
  color: #f0e2cb;
  font-size: 16px;
  cursor: pointer;
}
.photo-lightbox-close:hover{ background-color: rgba(240,226,203,.14); }

@media (max-width: 560px){
  .letter-gallery{ gap: 6px; }
  .letter-gallery-item figcaption{ font-size: 10px; }
}


/* ============================================================
   2026-10-30 第三轮：首页牛皮纸背景 + 信后醒目 CTA
   ============================================================ */

/* 首页背景：只在登录视图显示；固定在所有内容之下，贴纸/卡片照常压在上面 */
.login-bg{
  position: fixed;
  inset: 0;
  z-index: 0;
  display: none;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(250,240,226,.30), rgba(248,236,220,.18)),
    url("kraft-paper.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
html.is-login-view .login-bg{ display: block; }

/* 首页：卡片压在书本之上，牛皮纸只露在卡片外面 */
html.is-login-view .reel,
html.is-login-view .login-card{ z-index: 2; }
html.is-login-view .login-book{ z-index: 0; }

/* 读完信之后自动弹出的醒目 CTA */
.letter-cta{
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 120;
  width: min(520px, calc(100vw - 32px));
  padding: 14px 16px 16px;
  background-color: var(--parchment, #f5e6d3);
  border: 2px solid var(--saddle, #8b4513);
  box-shadow: 7px 7px 0 rgba(92,46,10,.22), 0 0 0 6px rgba(245,230,211,.30);
  transform: translate(-50%, 22px);
  opacity: 0;
  pointer-events: none;
  transition: transform .52s cubic-bezier(.18,.9,.24,1), opacity .36s ease;
}
.letter-cta.is-in{
  transform: translate(-50%, 0);
  opacity: 1;
  pointer-events: auto;
}
.letter-cta-note{
  margin: 0 0 10px;
  font-size: .84rem;
  letter-spacing: .06em;
  color: var(--ink-70, #7a4a1e);
  text-align: center;
}
.letter-cta-btn{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 9px;
  padding: 13px 18px;
  background-color: var(--saddle, #8b4513);
  color: var(--parchment, #f5e6d3);
  border: 2px solid var(--saddle-deep, #5c2e0a);
  box-shadow: 4px 4px 0 rgba(92,46,10,.25);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .16em;
  text-decoration: none;
  transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease;
}
.letter-cta-btn:hover{
  background-color: var(--saddle-deep, #5c2e0a);
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(92,46,10,.28);
}
.letter-cta-btn:focus-visible{
  outline: 3px solid #c94c4c;
  outline-offset: 3px;
}
.letter-cta-btn--ghost{
  background-color: transparent;
  color: var(--saddle, #8b4513);
  border-style: dashed;
  box-shadow: none;
}
.letter-cta-btn--ghost:hover{
  background-color: var(--parchment-3, #eedbc2);
  color: var(--saddle-deep, #5c2e0a);
}
.letter-cta-arrow{ font-size: 1.15em; line-height: 1; }

/* 主信末尾的 PDF 小链接 */
.letter-pdf-link{
  display: inline-block;
  align-self: center;
  font-size: .86rem;
  letter-spacing: .1em;
  color: var(--ink-70, #7a4a1e);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.letter-pdf-link:hover{ color: var(--saddle-deep, #5c2e0a); }

@media (max-width: 640px){
  .letter-cta{ bottom: 12px; padding: 11px 12px 13px; }
  .letter-cta-note{ font-size: .78rem; margin-bottom: 8px; }
  .letter-cta-btn{ font-size: .94rem; padding: 11px 13px; letter-spacing: .12em; }
}
@media (prefers-reduced-motion: reduce){
  .letter-cta{ transition: none; transform: translate(-50%, 0); opacity: 1; }
  .letter-cta-btn{ transition: none; }
}


/* 礼物小记：底部留白，避免固定 CTA 盖住「再看一次/收好」按钮 */
.gift-letter-sheet .letter-inner{ padding-bottom: 118px; }
@media (max-width: 640px){
  .gift-letter-sheet .letter-inner{ padding-bottom: 152px; }
}