/* ============================================================
   慢递 · 样式表
   目录：Token / 背景 / 页头 / 展示台 / 写信台 / 信箱 / 页脚 / 响应式
============================================================ */
/* ============================================================
   Token
============================================================ */
:root{
  --ink:        #101419;
  --ink-2:      #161c22;
  --paper:      #ece0c5;
  --paper-2:    #e3d3ae;
  --seal:       #a6342a;
  --seal-dark:  #7e231c;
  --gold:       #c9a86a;
  --cream:      #ece3cc;
  --muted:      #8d98a1;
  --inkline:    #3b3222;
  --line:       rgba(201,168,106,.22);
  --err:        #d06a5a;
  --ok:         #7aa07a;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --font-hand:  "Ma Shan Zheng", "Noto Serif SC", cursive;
  --ease-out: cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;overflow-x:clip;}
body{
  background:var(--ink);color:var(--cream);
  font-family:var(--font-serif);overflow-x:hidden;line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}
a{color:inherit;}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px;}
::selection{background:var(--seal);color:var(--paper);}
main{display:block;}

/* ============================================================
   背景：水墨山水
   天 → 月 → 三层远山 → 雾 → 绢纹 → 回纹框
============================================================ */
.bg-scene{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;}

.bg-sky{
  position:absolute;inset:0;
  background:
    radial-gradient(78% 52% at 50% 12%, rgba(214,196,150,.10), transparent 62%),
    radial-gradient(46% 34% at 78% 6%, rgba(166,52,42,.06), transparent 70%),
    radial-gradient(120% 80% at 50% 120%, rgba(6,11,14,.92), transparent 64%),
    linear-gradient(178deg, #0b1116 0%, #0f1a1f 38%, #0c1418 68%, #070c0f 100%);
}

/* 绢：极细经纬，靠极低透明度，避免摩尔纹 */
.bg-silk{
  position:absolute;inset:0;opacity:.55;mix-blend-mode:overlay;
  background-image:
    repeating-linear-gradient(90deg, rgba(236,224,197,.030) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(0deg,  rgba(236,224,197,.022) 0 1px, transparent 1px 4px);
}

/* 月 */
.bg-moon{position:absolute;left:70%;top:17%;width:min(40vw,420px);aspect-ratio:1;transform:translate(-50%,-50%);}
.bg-moon .halo{
  position:absolute;inset:0;border-radius:50%;
  background:radial-gradient(circle, rgba(236,224,197,.10) 0%, rgba(214,196,150,.05) 30%, transparent 62%);
  filter:blur(18px);
}
.bg-moon .disc{
  position:absolute;left:50%;top:50%;width:26%;aspect-ratio:1;transform:translate(-50%,-50%);
  border-radius:50%;
  background:radial-gradient(circle at 42% 38%, #f2e8d0 0%, #e2d2ae 46%, rgba(201,168,106,.42) 78%, transparent 100%);
  opacity:.22;filter:blur(2.4px);
}

/* 山：三层，越近越深越实，山脚溶进雾里 */
.bg-range{position:absolute;left:-8%;right:-8%;bottom:0;will-change:transform;}
.bg-range svg{display:block;width:100%;height:100%;}
.bg-range.r-far {height:48vh;filter:blur(5px);}
.bg-range.r-mid {height:33vh;filter:blur(2px);}
.bg-range.r-near{height:23vh;filter:blur(.8px);}

/* 云海：只留极薄一层压在近山腰上 */
.bg-mist{
  position:absolute;left:-16%;right:-16%;bottom:10%;height:15%;
  background:
    radial-gradient(56% 38% at 22% 56%, rgba(198,216,220,.075), transparent 72%),
    radial-gradient(50% 32% at 73% 44%, rgba(198,216,220,.058), transparent 74%);
  filter:blur(34px);
  will-change:transform;
}

/* 两侧竖排题跋，像画卷的款识 */
.bg-verse{
  position:absolute;top:22%;margin:0;
  font-family:var(--font-hand);font-weight:400;
  font-size:clamp(15px,1.55vw,21px);letter-spacing:.3em;
  color:rgba(201,168,106,.38);
  text-shadow:0 0 18px rgba(201,168,106,.18);
  writing-mode:vertical-rl;text-orientation:upright;
  user-select:none;
}
.bg-verse.v-left {left:clamp(16px,3vw,58px);}
.bg-verse.v-right{right:clamp(16px,3vw,58px);top:30%;}

/* 四角回纹 */
.bg-fret{position:absolute;inset:clamp(10px,1.6vw,22px);pointer-events:none;}
.bg-fret i{
  position:absolute;width:clamp(46px,5.4vw,74px);height:clamp(46px,5.4vw,74px);
  border:1px solid rgba(201,168,106,.26);
}
.bg-fret i::before,.bg-fret i::after{
  content:"";position:absolute;background:rgba(201,168,106,.26);
}
.bg-fret i::before{width:60%;height:1px;}
.bg-fret i::after{width:1px;height:60%;}
.bg-fret .tl{left:0;top:0;border-right:none;border-bottom:none;}
.bg-fret .tl::before{left:0;top:32%;}
.bg-fret .tl::after{left:32%;top:0;}
.bg-fret .tr{right:0;top:0;border-left:none;border-bottom:none;}
.bg-fret .tr::before{right:0;top:32%;}
.bg-fret .tr::after{right:32%;top:0;}
.bg-fret .bl{left:0;bottom:0;border-right:none;border-top:none;}
.bg-fret .bl::before{left:0;bottom:32%;}
.bg-fret .bl::after{left:32%;bottom:0;}
.bg-fret .br{right:0;bottom:0;border-left:none;border-top:none;}
.bg-fret .br::before{right:0;bottom:32%;}
.bg-fret .br::after{right:32%;bottom:0;}

/* 四周压暗，收拢视线 */
.bg-vignette{
  position:absolute;inset:0;
  background:
    linear-gradient(0deg, rgba(4,8,10,.58) 0%, rgba(4,8,10,.22) 14%, transparent 30%),
    radial-gradient(112% 78% at 50% 44%, transparent 40%, rgba(4,8,10,.60) 100%);
}

#dust{position:fixed;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;}
.grain{
  position:fixed;inset:0;z-index:2;pointer-events:none;mix-blend-mode:overlay;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   开场：手写标题
============================================================ */
#intro{
  position:fixed;inset:0;z-index:200;background:var(--ink);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  overflow:hidden;
}
#intro.gone{display:none;}
.intro-stage{position:relative;padding:0 clamp(16px,5vw,48px);}
.intro-title{
  font-family:var(--font-hand);color:var(--cream);font-weight:400;
  font-size:clamp(2.2rem,7.6vw,5rem);line-height:1.55;letter-spacing:.06em;
  text-align:center;
}
.intro-title .ch{
  display:inline-block;overflow:hidden;vertical-align:top;
  padding:0 .05em;
  clip-path:inset(0 0 100% 0);
}
.intro-rule{
  height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);
  width:min(520px,74vw);margin:22px auto 0;transform:scaleX(0);transform-origin:50% 50%;
}
.intro-sub{
  margin-top:18px;text-align:center;font-family:var(--font-display);font-style:italic;
  font-size:clamp(13px,2.2vw,17px);color:var(--gold);letter-spacing:.26em;opacity:0;
}
.intro-skip{
  position:fixed;bottom:clamp(22px,5vh,44px);left:50%;transform:translateX(-50%);
  font-family:var(--font-display);font-size:11px;letter-spacing:.34em;
  color:rgba(141,152,161,.55);text-transform:uppercase;padding:12px 18px;
  transition:color .3s;opacity:.75;
}
.intro-skip:hover{color:var(--gold);opacity:1;}

/* 钢笔尖 */
.nib{position:absolute;left:0;top:0;width:60px;height:120px;margin-left:-30px;margin-top:-120px;pointer-events:none;opacity:0;}
.nib svg{display:block;transform:rotate(-22deg);transform-origin:50% 100%;}
.nib .tip{
  position:absolute;left:50%;bottom:8px;width:6px;height:6px;margin-left:-3px;border-radius:50%;
  background:var(--seal);opacity:.9;filter:blur(.3px);box-shadow:0 0 8px rgba(166,52,42,.8);
}

/* ============================================================
   Header
============================================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;height:64px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(20px,4vw,48px);mix-blend-mode:difference;color:#fff;
}
.site-header .logo{
  display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;
  font-weight:600;letter-spacing:.2em;font-size:15px;
}
.site-header .logo svg{display:block;}
.site-header .nav{display:flex;align-items:center;gap:clamp(20px,4vw,38px);}
.site-header .nav a,.site-header .nav button{
  text-decoration:none;font-size:13px;letter-spacing:.2em;opacity:.78;
  transition:opacity .25s;padding:6px 0;
}
.site-header .nav a:hover,.site-header .nav button:hover{opacity:1;}
.site-header .nav .count{font-family:var(--font-display);font-size:13px;opacity:.6;}

/* ============================================================
   展示台
============================================================ */
.showcase{
  position:relative;z-index:3;min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:clamp(30px,3.6vh,46px) clamp(16px,4vw,48px) clamp(4px,1vh,8px);
  gap:clamp(10px,1.9vh,20px);
}
/* 标题用书法体：毛笔字的提按与飞白都在字体里 */
.show-title{
  position:relative;top:-46px;              /* 只挪字，不动信封 */
  font-family:var(--font-hand);font-weight:400;color:var(--cream);text-align:center;
  line-height:1.3;
  font-size:clamp(2.25rem,4.8vw,3.55rem);letter-spacing:.13em;text-indent:.13em;
  text-shadow:0 3px 34px rgba(0,0,0,.55), 0 0 1px rgba(255,244,220,.18);
}
.show-title .ch{display:inline-block;overflow:hidden;vertical-align:bottom;padding:.13em 0;margin:-.13em 0;}
.show-title .ch i{display:inline-block;font-style:normal;}

.carousel{position:relative;width:100%;max-width:1360px;}
/* 信封尺寸由"视口剩下的高度"反推：170vh - 500px 是给标题、名称、计数条让完位之后
   还能给信封的高度，再按 17:10 宽比折回宽度，所以再矮的屏幕也不会把按钮顶出首屏。 */
.carousel-stage{
  --env-w:clamp(280px, min(64vw, calc(123vh - 407px)), 860px);
  --read-shift:clamp(6px, 1.2vh, 14px);
  --letter-out:48;
  position:relative;
  height:calc(var(--env-w) * 0.5882);
  perspective:1500px;perspective-origin:50% 60%;
  touch-action:pan-y;cursor:grab;user-select:none;-webkit-user-select:none;
}
.carousel-stage.dragging{cursor:grabbing;}
.env{
  position:absolute;left:50%;bottom:0;
  width:var(--env-w);
  margin-left:calc(var(--env-w) / -2);
  transform-origin:50% 100%;
  will-change:transform,opacity;
  outline:none;
}
/* 阴影用 box-shadow，不用 filter：filter 会把整只信封（含 SVG 文字）离屏光栅化，
   再合成回来时文字就被降采样糊掉了 */
.env .env-inner{
  display:block;position:relative;border-radius:4px;
  transform-origin:50% 100%;
  transform:translateY(0);
  box-shadow:0 24px 32px rgba(0,0,0,.58);
  transition:transform .62s cubic-bezier(.22,1,.36,1),box-shadow .5s;
}
.env .env-inner::after{
  content:"";position:absolute;inset:0;border-radius:4px;pointer-events:none;
  mix-blend-mode:overlay;opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.86' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.env:focus-visible .env-inner{outline:2px solid var(--gold);outline-offset:6px;}
.env .env-svg{display:block;width:100%;height:auto;border-radius:4px;overflow:visible;}

/* 封盖：绕信封上沿翻转，翻起来像真的开口 */
.env .env-flap{
  transform-box:view-box;transform-origin:170px 1.5px;
  transition:transform .6s cubic-bezier(.34,.06,.2,1),filter .6s;
  will-change:transform;
}
/* 信纸：从信封里往上抽出来 */
.env .env-letter{
  transform-box:view-box;transform-origin:170px 200px;
  opacity:0;
  /* 不加 filter / 不加 rotate：这两样都会让 SVG 文字被重采样，放大后发虚 */
  transition:transform .4s cubic-bezier(.4,0,.7,1),opacity .2s ease;
}
.env.is-center:hover .env-inner,
.env.is-center.is-open .env-inner{
  transform:translateY(var(--read-shift));
  box-shadow:0 30px 42px rgba(0,0,0,.64);
}
.env.is-center:hover .env-flap{transform:scaleY(-0.52);filter:brightness(.82);}
/* 开信时火漆先"裂开"，让信纸干净地出来 */
.env .env-seal{
  transform-box:fill-box;transform-origin:50% 50%;
  transition:opacity .34s ease,transform .46s cubic-bezier(.3,.1,.4,1);
}
.env.is-center:hover .env-seal,
.env.is-center.is-open .env-seal{opacity:0;transform:rotate(-9deg) scale(.82);}
.env.is-center:hover .env-letter{
  transform:translateY(calc(var(--letter-out) * -1px));
  opacity:1;
  transition:transform .78s cubic-bezier(.22,1,.36,1),opacity .3s ease .12s;
}
/* 触屏没有 hover，点一下开信 */
.env.is-center.is-open .env-flap{transform:scaleY(-0.52);filter:brightness(.82);}
.env.is-center.is-open .env-letter{
  transform:translateY(calc(var(--letter-out) * -1px));
  opacity:1;
  transition:transform .78s cubic-bezier(.22,1,.36,1),opacity .3s ease .12s;
}

.carousel-caption{
  position:relative;top:27px;               /* 说明行与按钮整体下沉，信封位置不变 */
  margin-top:clamp(16px,2.2vh,22px);text-align:center;
  display:flex;flex-direction:column;align-items:center;
  transition:padding-top .42s var(--ease-out);
}
/* 触屏点开信封时整封会下沉 --read-shift，说明行跟着让位，别被信封压住 */
.showcase:has(.env.is-center.is-open) .carousel-caption{padding-top:36px;}
/* 拆信时标题与说明让位：信封下沉、信纸升起，上方空间全给纸面 */
.showcase .show-title{transition:opacity .34s ease,transform .52s cubic-bezier(.22,1,.36,1);}
.showcase:has(.env.is-center:hover) .show-title,
.showcase:has(.env.is-center.is-open) .show-title{
  opacity:0!important;transform:translateY(-14px);
}
/* 只留一行说明，名称与计数条都去掉了 */
.cap-desc{
  max-width:min(34rem,86vw);font-size:14px;color:#a3adb5;
  letter-spacing:.06em;line-height:1.72;text-wrap:balance;
}

/* 左右切换：贴住视窗两侧边缘 */
.stage-nav{
  position:fixed;top:50%;margin-top:-27px;z-index:45;
  width:54px;height:54px;display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(201,168,106,.28);border-radius:50%;
  color:rgba(214,204,184,.66);
  background:radial-gradient(circle at 50% 38%, rgba(26,30,36,.78), rgba(10,13,17,.52));
  -webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px);
  box-shadow:0 8px 24px rgba(0,0,0,.32), inset 0 1px 0 rgba(255,244,220,.07);
  transition:opacity .42s ease,border-color .28s,color .28s,background .28s,transform .18s,box-shadow .28s;
}
.stage-nav:hover{
  border-color:var(--gold);color:var(--gold);
  background:radial-gradient(circle at 50% 38%, rgba(40,44,50,.86), rgba(14,18,22,.6));
  box-shadow:0 10px 30px rgba(0,0,0,.4), 0 0 0 6px rgba(201,168,106,.05);
}
.stage-nav:active{transform:scale(.93);}
.stage-nav svg{display:block;}
#prevBtn{left:clamp(8px,2.2vw,40px);}
#nextBtn{right:clamp(8px,2.2vw,40px);}
.stage-nav.is-hidden{opacity:0!important;pointer-events:none;}

.show-cta{
  position:relative;top:27px;
  display:flex;flex-direction:column;align-items:center;gap:8px;margin-top:clamp(2px,.8vh,8px);
}
.btn-primary{
  position:relative;display:inline-flex;align-items:center;gap:14px;min-height:48px;
  padding:13px 42px;border:1px solid var(--gold);color:var(--cream);background:transparent;
  letter-spacing:.36em;text-indent:.36em;font-size:14px;
  transition:background .34s,color .34s,transform .12s;
}
.btn-primary:hover{background:var(--gold);color:var(--ink);}
.btn-primary:active{transform:scale(.985);}
.btn-quiet{
  font-size:12.5px;letter-spacing:.24em;color:var(--muted);padding:8px 4px;
  border-bottom:1px solid transparent;transition:color .28s,border-color .28s;
}
.btn-quiet:hover{color:var(--gold);border-bottom-color:rgba(201,168,106,.4);}

/* ============================================================
   流程
============================================================ */
.process{position:relative;z-index:3;padding:clamp(76px,12vh,132px) clamp(20px,5vw,56px);}
.process-inner{max-width:800px;margin:0 auto;}
.process-head{margin-bottom:clamp(40px,7vh,66px);}
.process-eyebrow{
  font-family:var(--font-display);font-size:12px;letter-spacing:.42em;color:var(--muted);
  text-transform:uppercase;margin-bottom:13px;
}
.process-head h2{
  font-weight:600;font-size:clamp(1.7rem,4.2vw,2.5rem);letter-spacing:.13em;
  color:var(--cream);line-height:1.35;
}
.steps{list-style:none;border-top:1px solid var(--line);}
.step{
  display:grid;grid-template-columns:72px 1fr;gap:clamp(12px,3vw,30px);
  padding:clamp(22px,3.6vh,32px) 0;border-bottom:1px solid var(--line);
}
.step-num{
  font-family:var(--font-display);font-size:clamp(24px,3.6vw,34px);color:var(--gold);
  opacity:.48;line-height:1;letter-spacing:.02em;
}
.step h3{font-size:clamp(16px,2.3vw,19px);font-weight:600;letter-spacing:.15em;color:var(--cream);margin-bottom:8px;}
.step p{font-size:13.8px;color:var(--muted);line-height:2;max-width:52ch;text-wrap:pretty;}
.step .step-en{
  display:block;margin-top:6px;font-family:var(--font-display);font-style:italic;
  font-size:12.5px;color:rgba(201,168,106,.55);letter-spacing:.1em;
}
.process-note{
  margin-top:clamp(28px,4.6vh,42px);padding:16px 20px;border-left:2px solid var(--gold);
  background:rgba(201,168,106,.05);font-size:13.2px;color:var(--muted);
  line-height:1.95;letter-spacing:.03em;
}
.process-note b{color:var(--cream);font-weight:600;}

/* ============================================================
   信箱：一块钉在墙上的公告板
   左边钉自己寄出的信，右边钉驿路公告。
   板上只有编号、日期、状态——邮箱与地址不上墙。
============================================================ */
.mailbox{position:relative;z-index:3;padding:clamp(64px,10vh,112px) clamp(20px,5vw,56px);}
.mailbox-head{max-width:1180px;margin:0 auto clamp(30px,4.8vh,46px);}
.mailbox-eyebrow{
  font-family:var(--font-display);font-size:12px;letter-spacing:.42em;color:var(--muted);
  text-transform:uppercase;margin-bottom:13px;
}
.mailbox-head h2{font-weight:600;font-size:clamp(1.7rem,4.2vw,2.5rem);letter-spacing:.13em;color:var(--cream);line-height:1.35;}
.mailbox-head .sub{
  margin-top:11px;font-family:var(--font-display);font-style:italic;color:var(--gold);
  letter-spacing:.16em;font-size:clamp(13.5px,2vw,15.5px);
}
.mailbox-body{max-width:1180px;margin:0 auto;}

/* 软木板：内圈压一层暗，边上一道金线，像挂了很多年的样子 */
.board{
  position:relative;
  min-height:clamp(460px,56vh,620px);
  display:grid;
  grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);
  gap:clamp(20px,2.8vw,44px);
  padding:clamp(28px,3.2vw,46px) clamp(22px,3vw,42px);
  border:1px solid rgba(201,168,106,.24);
  background:
    radial-gradient(130% 76% at 50% -12%, rgba(168,126,76,.32), transparent 64%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='c'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.58' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23c)' opacity='0.13'/%3E%3C/svg%3E"),
    linear-gradient(168deg,#4b3421 0%,#3a2717 48%,#291a10 100%);
  box-shadow:
    0 46px 96px rgba(0,0,0,.62),
    inset 0 0 0 6px rgba(22,13,6,.5),
    inset 0 0 0 7px rgba(201,168,106,.1),
    inset 0 0 130px rgba(0,0,0,.5);
}
/* 顶边两截胶带，把板子"粘"在墙上 */
.board-tape{
  position:absolute;top:-11px;width:clamp(76px,9vw,118px);height:25px;
  background:linear-gradient(180deg, rgba(228,208,166,.30), rgba(200,176,130,.17));
  border-left:1px solid rgba(255,244,220,.12);border-right:1px solid rgba(255,244,220,.12);
  box-shadow:0 6px 14px rgba(0,0,0,.26);pointer-events:none;
}
.board-tape.t-left{left:clamp(26px,6vw,72px);transform:rotate(-2.4deg);}
.board-tape.t-right{right:clamp(26px,6vw,72px);transform:rotate(1.8deg);}

.board-col{display:flex;flex-direction:column;gap:clamp(12px,1.6vw,16px);min-width:0;}
.board-cap{
  display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  font-size:11.5px;letter-spacing:.3em;color:rgba(236,227,204,.46);
  padding-bottom:2px;
}
.board-cap em{
  font-family:var(--font-display);font-style:italic;letter-spacing:.1em;
  font-size:11px;color:rgba(201,168,106,.5);white-space:nowrap;
}
.board-shuffle{
  font-size:11px;letter-spacing:.2em;color:rgba(236,227,204,.5);
  padding:4px 8px;border:1px solid rgba(201,168,106,.26);
  transition:color .26s,border-color .26s,background .26s;
}
.board-shuffle:hover{color:var(--gold);border-color:rgba(201,168,106,.6);background:rgba(201,168,106,.07);}

/* ---------- 板上的一句说明：这里只做展示 ---------- */
.board-note{
  font-size:11.5px;line-height:1.9;letter-spacing:.05em;
  color:rgba(236,227,204,.4);
}
.board-goto{
  align-self:flex-start;margin-top:-4px;
  font-size:11.5px;letter-spacing:.16em;color:rgba(201,168,106,.82);
  padding:4px 0;border-bottom:1px solid rgba(201,168,106,.26);
  transition:color .26s,border-color .26s;
}
.board-goto:hover{color:var(--gold);border-bottom-color:var(--gold);}

/* ---------- 板上钉着的信 ---------- */
.sent-list{display:flex;flex-direction:column;gap:clamp(14px,1.8vw,20px);}
/* 一张一张手贴上去的，宽窄不会完全齐 */
.sent-list > :nth-child(1){margin-right:3.5%;}
.sent-list > :nth-child(2){margin-left:4.5%;}
.sent-list > :nth-child(3){margin-right:1.5%;}
.sent-list > :nth-child(4){margin-left:2.5%;}
.sent-list > :nth-child(5){margin-right:5%;}
.sent-list > :nth-child(n+6){margin-right:2%;}
.sent-item{
  position:relative;
  padding:24px 18px 16px;
  background:linear-gradient(172deg,#f3e9d3 0%,#e8d9b9 68%,#e0cfab 100%);
  color:#3b3222;cursor:pointer;
  transform:rotate(-.5deg);
  box-shadow:0 12px 22px rgba(0,0,0,.38), inset 0 1px 0 rgba(255,255,255,.5);
  transition:transform .34s var(--ease-out),box-shadow .34s;
}
.sent-item:nth-child(even){transform:rotate(.55deg);}
.sent-item:hover,.sent-item.open{transform:rotate(0deg) translateY(-2px);box-shadow:0 20px 34px rgba(0,0,0,.46), inset 0 1px 0 rgba(255,255,255,.5);}
/* 板子上随机钉的信封：没报邮箱就拆不开，别给个"能点"的错觉 */
.sent-item.sealed{cursor:default;padding:18px 16px 13px;}
.sent-item.sealed:hover{transform:rotate(-.5deg);box-shadow:0 12px 22px rgba(0,0,0,.38), inset 0 1px 0 rgba(255,255,255,.5);}
.sent-item.sealed:nth-child(even):hover{transform:rotate(.55deg);}
.sent-item.sealed .preview{font-style:italic;color:rgba(59,50,34,.4);}
.sent-item.sealed .meta{padding-right:2px;}
.sent-item.sealed .row{margin-top:9px;gap:8px;}
/* 图钉：钉在纸的上沿中间，露半颗在外边 */
.sent-item .pin{
  position:absolute;left:50%;top:-7px;width:15px;height:15px;margin-left:-7.5px;border-radius:50%;
  background:radial-gradient(circle at 34% 28%, #dc6050, var(--seal) 60%, #6d1f16);
  box-shadow:0 3px 6px rgba(0,0,0,.45), inset 0 -1px 2px rgba(0,0,0,.3);
}
.sent-item .meta{min-width:0;padding-right:46px;}
.sent-item .meta .to{
  font-family:var(--font-hand);font-size:17px;letter-spacing:.04em;color:#2f2718;line-height:1.5;
}
.sent-item .meta .preview{
  margin-top:2px;font-size:12.6px;color:rgba(59,50,34,.62);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:.02em;
}
/* 能拆的那几张：行末一个「拆开 →」，点整张纸进单封 */
.sent-item .open-tip{
  margin-left:auto;flex:none;
  font-family:var(--font-display);font-size:10px;letter-spacing:.2em;
  color:rgba(59,50,34,.4);
  transition:color .24s;
}
.sent-item.openable:hover .open-tip{color:#8c2f22;}
.sent-item .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px;}
.sent-item .no{
  font-family:var(--font-display);font-size:11px;letter-spacing:.18em;color:rgba(59,50,34,.45);
}
.sent-item .due{
  font-family:var(--font-display);font-size:12px;letter-spacing:.1em;
  color:#8a5a1e;white-space:nowrap;
}
.sent-item .badge{
  font-size:10.5px;letter-spacing:.16em;padding:2px 8px;border:1px solid rgba(59,50,34,.22);
  color:rgba(59,50,34,.66);white-space:nowrap;
}
.sent-item .badge.arrived{border-color:rgba(76,107,67,.46);color:#4c6b43;}
.sent-item .badge.travel{border-color:rgba(140,90,30,.4);color:#8a5a1e;}
.sent-item .countdown{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--seal),#a8823e);
}
/* 取回：纸角上的小字，不抢正文 */
.sent-item .del{
  position:absolute;right:8px;top:6px;z-index:2;
  font-size:10.5px;letter-spacing:.12em;color:rgba(59,50,34,.56);
  padding:5px 8px;border:1px solid rgba(59,50,34,.2);border-radius:2px;
  transition:color .24s,background .24s,border-color .24s;
}
.sent-item .del:hover{color:#8c2f22;border-color:rgba(166,52,42,.45);background:rgba(166,52,42,.1);}

/* ---------- 驿路公告：皱一点的牛皮纸便签 ---------- */
.notice-list{list-style:none;display:flex;flex-direction:column;gap:clamp(12px,1.6vw,18px);}
.notice:nth-child(1){margin-right:7%;}
.notice:nth-child(2){margin-left:6%;}
.notice:nth-child(3){margin-right:3%;}
.notice:nth-child(4){margin-left:9%;}
.notice{
  position:relative;
  padding:15px 16px 16px;
  background:linear-gradient(170deg,#dcc9a1 0%,#cbb282 70%,#bfa471 100%);
  color:#3a2c1a;
  transform:rotate(var(--r,0deg));
  box-shadow:0 12px 22px rgba(0,0,0,.34), inset 0 1px 0 rgba(255,250,235,.42);
  transition:transform .34s var(--ease-out),box-shadow .34s;
}
.notice:hover{transform:rotate(0deg) translateY(-2px);box-shadow:0 18px 30px rgba(0,0,0,.42);}
.nt-pin{
  position:absolute;left:50%;top:-5px;width:11px;height:11px;margin-left:-5.5px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#e6c886,#b18b3f 60%,#7a5a22);
  box-shadow:0 2px 4px rgba(0,0,0,.4);
}
.nt-no{
  font-family:var(--font-display);font-size:10px;letter-spacing:.24em;
  color:rgba(58,44,26,.5);margin-bottom:5px;
}
.nt-text{
  font-family:var(--font-hand);font-size:clamp(14px,1.5vw,16px);
  line-height:1.72;letter-spacing:.02em;color:#3a2c1a;text-wrap:pretty;
}

.empty{
  display:none;flex:1 1 auto;min-height:220px;
  align-items:center;justify-content:center;flex-direction:column;
  padding:clamp(26px,4vh,42px) 18px;text-align:center;
  border:1px dashed rgba(201,168,106,.26);
}
.empty.on{display:flex;}
.empty .empty-envelope{width:76px;height:54px;margin:0 auto 18px;opacity:.38;}
.empty .empty-envelope path,.empty .empty-envelope rect{stroke:var(--gold);stroke-width:1.3;fill:none;}
.empty h3{font-size:16px;font-weight:600;letter-spacing:.13em;color:var(--cream);margin-bottom:8px;}
.empty p{font-size:13px;color:rgba(236,227,204,.45);letter-spacing:.05em;}

/* ---------- 取回确认 ---------- */
.board-confirm{
  position:fixed;inset:0;z-index:130;
  display:flex;align-items:center;justify-content:center;padding:20px;
  background:rgba(8,5,2,.62);
  -webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);
  opacity:0;visibility:hidden;
  transition:opacity .26s ease,visibility 0s linear .26s;
}
.board-confirm.on{opacity:1;visibility:visible;transition-delay:0s;}
.bc-box{
  width:min(352px,86vw);padding:26px 24px 20px;text-align:center;
  background:linear-gradient(180deg,#2c1709,#1c0e05);
  border:1px solid rgba(201,168,106,.32);
  box-shadow:0 32px 64px rgba(0,0,0,.62), inset 0 0 0 1px rgba(255,232,190,.05);
  transform:translateY(12px) scale(.97);
  transition:transform .34s var(--ease-out);
}
.board-confirm.on .bc-box{transform:none;}
.bc-text{font-family:var(--font-hand);font-size:clamp(17px,2.2vw,19px);line-height:1.7;color:var(--cream);letter-spacing:.06em;}
.bc-hint{margin-top:8px;font-size:11.5px;line-height:1.8;color:rgba(236,227,204,.42);letter-spacing:.06em;}
.bc-actions{display:flex;gap:10px;margin-top:22px;}

/* ============================================================
   我的信箱：背景虚化，弹出一块几乎铺满全屏的公告栏
   顶上一条搜索框（收件邮箱），下面是自己的信。
============================================================ */
.mybox{
  position:fixed;inset:0;z-index:90;
  display:flex;align-items:center;justify-content:center;
  padding:clamp(14px,4.4vh,54px) clamp(14px,4vw,64px);
  background:rgba(6,4,2,.5);
  -webkit-backdrop-filter:blur(16px) saturate(.82);
  backdrop-filter:blur(16px) saturate(.82);
  opacity:0;visibility:hidden;
  transition:opacity .34s ease,visibility 0s linear .34s;
}
.mybox.on{opacity:1;visibility:visible;transition-delay:0s;}

.mybox-panel{
  position:relative;
  display:flex;flex-direction:column;
  width:100%;max-width:1560px;height:100%;
  padding:clamp(20px,2.8vh,34px) clamp(18px,2.6vw,40px) clamp(14px,2vh,20px);
  border:1px solid rgba(201,168,106,.26);
  background:
    radial-gradient(120% 70% at 50% -10%, rgba(168,126,76,.30), transparent 62%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='c'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.58' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23c)' opacity='0.13'/%3E%3C/svg%3E"),
    linear-gradient(168deg,#412c1b 0%,#33210f 50%,#241608 100%);
  box-shadow:
    0 50px 110px rgba(0,0,0,.72),
    inset 0 0 0 6px rgba(22,13,6,.46),
    inset 0 0 0 7px rgba(201,168,106,.09),
    inset 0 0 150px rgba(0,0,0,.5);
  transform:translateY(22px) scale(.986);
  transition:transform .46s var(--ease-out);
}
.mybox.on .mybox-panel{transform:none;}

.mybox-tape{
  position:absolute;top:-10px;width:clamp(88px,10vw,140px);height:24px;
  background:linear-gradient(180deg, rgba(228,208,166,.32), rgba(200,176,130,.18));
  border-left:1px solid rgba(255,244,220,.12);border-right:1px solid rgba(255,244,220,.12);
  box-shadow:0 6px 14px rgba(0,0,0,.3);pointer-events:none;
}
.mybox-tape.t1{left:clamp(30px,8vw,120px);transform:rotate(-2deg);}
.mybox-tape.t2{right:clamp(30px,8vw,120px);transform:rotate(1.6deg);}

.mybox-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;}
.mybox-eyebrow{
  font-family:var(--font-display);font-size:11px;letter-spacing:.4em;
  color:rgba(201,168,106,.62);text-transform:uppercase;
}
.mybox-head h2{
  margin-top:7px;font-family:var(--font-hand);font-weight:400;
  font-size:clamp(1.15rem,2.4vw,1.72rem);letter-spacing:.1em;line-height:1.4;
  color:var(--cream);text-shadow:0 2px 20px rgba(0,0,0,.45);
}
.mybox-close{
  flex:none;width:34px;height:34px;display:grid;place-items:center;margin-top:2px;
  color:rgba(236,227,204,.6);border:1px solid rgba(201,168,106,.24);
  transition:color .26s,border-color .26s,background .26s;
}
.mybox-close:hover{color:var(--cream);border-color:rgba(201,168,106,.62);background:rgba(201,168,106,.1);}

/* ---------- 顶上那条搜索框 ---------- */
.mybox-search{
  display:flex;align-items:center;gap:clamp(8px,1.2vw,14px);
  margin-top:clamp(14px,2.2vh,24px);
  padding:clamp(9px,1.2vh,13px) clamp(12px,1.4vw,18px);
  border:1px solid rgba(201,168,106,.32);
  background:rgba(12,7,2,.44);
  box-shadow:inset 0 1px 0 rgba(255,240,210,.06), 0 10px 26px rgba(0,0,0,.26);
  transition:border-color .26s,box-shadow .26s;
}
.mybox-search:focus-within{
  border-color:rgba(201,168,106,.7);
  box-shadow:inset 0 1px 0 rgba(255,240,210,.08), 0 12px 30px rgba(0,0,0,.32), 0 0 0 1px rgba(201,168,106,.16);
}
.ms-icon{flex:none;color:rgba(201,168,106,.7);}
.mybox-input{
  flex:1;min-width:0;border:0;background:transparent;
  color:var(--cream);font-family:var(--font-serif);
  font-size:clamp(13px,1.5vw,15px);letter-spacing:.04em;padding:2px 0;
}
.mybox-input::placeholder{color:rgba(236,227,204,.3);font-size:clamp(12px,1.3vw,13.5px);}
.mybox-input:focus{outline:none;}
.mybox-btn{
  flex:none;font-size:12px;letter-spacing:.2em;text-indent:.2em;color:#f3e7c8;
  padding:8px 18px;border:1px solid rgba(201,168,106,.5);background:rgba(201,168,106,.12);
  transition:color .26s,background .26s,border-color .26s;
}
.mybox-btn:hover{color:#1a1208;background:var(--gold);border-color:var(--gold);}
.mybox-hint{
  font-size:11.5px;line-height:1.9;letter-spacing:.05em;
  color:rgba(236,227,204,.42);margin-top:9px;
}

/* ---------- 第二步：六位验证码 ----------
   这两行是二选一显示的，都得盖掉 flex 的 display，
   否则 [hidden] 只会让元素变成 display:flex，根本藏不住。 */
.mybox-search[hidden],.mybox-code[hidden]{display:none;}
.mybox-code{
  display:flex;flex-direction:column;gap:9px;
  margin-top:clamp(14px,2.2vh,24px);
  padding:clamp(10px,1.4vh,15px) clamp(12px,1.4vw,18px);
  border:1px solid rgba(201,168,106,.44);
  background:rgba(12,7,2,.5);
  box-shadow:inset 0 1px 0 rgba(255,240,210,.06), 0 10px 26px rgba(0,0,0,.26);
}
.mc-to{font-size:12px;line-height:1.7;letter-spacing:.04em;color:rgba(236,227,204,.58);}
.mc-to b{font-weight:400;color:var(--gold);word-break:break-all;}
.mc-dev{
  display:block;width:fit-content;margin-top:6px;padding:3px 8px;border-radius:2px;
  font-size:10.5px;line-height:1.6;letter-spacing:.06em;
  color:#170f05;background:var(--gold);
}
.mc-dev[hidden]{display:none;}
.mc-row{display:flex;align-items:center;gap:clamp(8px,1.2vw,14px);}
/* 六位数字用不着铺满一整行：给个固定的短框，按钮跟在旁边，右边留白 */
.mc-input{
  flex:0 0 auto;width:clamp(152px, 20vw, 268px);padding:3px 0 6px;
  border:0;border-bottom:1px solid rgba(201,168,106,.36);background:transparent;
  font-family:var(--font-display);font-variant-numeric:tabular-nums;
  font-size:clamp(18px,2.1vw,23px);
  /* 字距会让整串视觉重心左偏，用同样大小的 indent 推回来 */
  letter-spacing:.4em;text-indent:.4em;text-align:center;
  color:var(--gold);
  transition:border-color .26s;
}
.mc-input:focus{outline:none;border-bottom-color:var(--gold);}
.mc-input::placeholder{
  font-family:var(--font-serif);font-size:12.5px;letter-spacing:.1em;text-indent:0;
  color:rgba(236,227,204,.24);
}
.mc-foot{
  display:flex;align-items:center;gap:clamp(10px,1.4vw,16px);
  font-size:11px;color:rgba(236,227,204,.36);
}
.mc-tip{flex:1;min-width:0;line-height:1.75;}
.mybox-link{
  flex:none;padding-bottom:1px;
  font-size:11px;letter-spacing:.08em;color:rgba(201,168,106,.82);
  border-bottom:1px solid rgba(201,168,106,.24);
  transition:color .24s,border-color .24s,opacity .24s;
}
.mybox-link:hover:not(:disabled){color:var(--gold);border-bottom-color:var(--gold);}
.mybox-link:disabled{opacity:.38;cursor:default;}
.mybox-btn:disabled{opacity:.5;cursor:default;}
.mybox-btn:disabled:hover{color:#f3e7c8;background:rgba(201,168,106,.12);border-color:rgba(201,168,106,.5);}

/* ---------- 两栏：收到的 / 我寄出的 ---------- */
.mybox-tabs{
  display:flex;align-items:baseline;gap:clamp(16px,2.4vw,30px);
  margin-top:clamp(12px,1.8vh,18px);
  padding-bottom:9px;
  border-bottom:1px solid rgba(201,168,106,.18);
}
.mybox-tabs[hidden]{display:none;}
.mtab{
  position:relative;flex:none;padding:2px 1px 7px;
  font-family:var(--font-hand);font-size:clamp(14px,1.7vw,17px);
  letter-spacing:.12em;color:rgba(236,227,204,.42);
  transition:color .24s;
}
.mtab::after{
  content:"";position:absolute;left:0;right:0;bottom:-10px;height:2px;
  background:var(--gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .32s var(--ease-out);
}
.mtab.on{color:var(--cream);}
.mtab.on::after{transform:scaleX(1);}
.mtab:hover{color:rgba(236,227,204,.78);}
.mtab-n{
  margin-left:5px;font-family:var(--font-display);font-size:11px;
  letter-spacing:.1em;color:rgba(201,168,106,.72);
}
.mtab-note{
  margin-left:auto;min-width:0;
  font-size:11px;line-height:1.7;letter-spacing:.04em;
  color:rgba(236,227,204,.3);text-align:right;
}
@media (max-width:560px){
  .mtab-note{display:none;}
}

/* ---------- 自己的信：一格格钉满整块板 ---------- */
.mybox-body{
  flex:1;min-height:0;
  margin-top:clamp(12px,1.8vh,18px);
  overflow-y:auto;overscroll-behavior:contain;
  padding:6px clamp(2px,.4vw,6px) 8px;
  scrollbar-width:thin;scrollbar-color:rgba(201,168,106,.34) transparent;
}
.mybox-body::-webkit-scrollbar{width:6px;}
.mybox-body::-webkit-scrollbar-thumb{background:rgba(201,168,106,.3);border-radius:3px;}
.mybox-body::-webkit-scrollbar-track{background:transparent;}
.mybox-list{
  display:grid;align-content:start;
  grid-template-columns:repeat(auto-fill,minmax(clamp(240px,25vw,320px),1fr));
  gap:clamp(16px,2vw,26px);
}
.mybox-list .sent-item:nth-child(n){margin-left:0;margin-right:0;}
/* 卡片里的预览是一行 nowrap，不给 min-width:0 会把网格整条撑出容器 */
.mybox-list > .sent-item{min-width:0;}
.mybox-empty{min-height:clamp(200px,42vh,340px);}

.mybox-foot{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:clamp(10px,1.6vh,16px);padding-top:clamp(10px,1.6vh,16px);
  border-top:1px solid rgba(201,168,106,.16);
}
.mybox-count{
  font-family:var(--font-display);font-size:11.5px;letter-spacing:.2em;
  color:rgba(236,227,204,.42);
}

/* ============================================================
   单封信 · 把一封信单独摊在桌上

   比「我的信箱」再高一层的浮层：后面那层本来就虚了，这里再压一层
   更重的毛玻璃，视线只剩这一张纸。
   纸面用的是写信台的同一套变量（--p-bg / --p-ink / --p-hline），
   所以当初选的是雪泥还是夜航，拆开时还是同一张纸。
============================================================ */
.letterview{
  position:fixed;inset:0;z-index:120;
  display:flex;align-items:center;justify-content:center;
  padding:clamp(16px,5vh,60px) clamp(14px,4vw,56px);
  background:rgba(4,3,1,.62);
  -webkit-backdrop-filter:blur(22px) saturate(.7);
  backdrop-filter:blur(22px) saturate(.7);
  opacity:0;visibility:hidden;
  transition:opacity .32s ease,visibility 0s linear .32s;
}
.letterview.on{opacity:1;visibility:visible;transition-delay:0s;}

.lv-card{
  position:relative;
  width:100%;max-width:min(700px,92vw);
  max-height:100%;
  display:flex;flex-direction:column;
  padding-top:46px;                 /* 给左上角那个「合上」留位置 */
  transform:translateY(18px) scale(.985);
  transition:transform .42s var(--ease-out);
}
.letterview.on .lv-card{transform:none;}

/* 左上角的关闭：一枚贴在信纸边缘的小封印 */
.lv-close{
  position:absolute;left:2px;top:0;
  display:flex;align-items:center;gap:7px;
  padding:7px 12px 7px 9px;
  font-size:11px;letter-spacing:.22em;text-indent:.22em;
  color:rgba(236,227,204,.66);
  border:1px solid rgba(201,168,106,.3);
  background:rgba(12,7,2,.5);
  transition:color .24s,border-color .24s,background .24s;
  -webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);
}
.lv-close:hover{color:#1a1208;background:var(--gold);border-color:var(--gold);}
.lv-close svg{flex:none;}

/* 信纸本体：跟写信台同一个纸面公式（横线/格子 + 渐变底色） */
.lv-sheet{
  position:relative;
  flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;
  padding:clamp(26px,4.4vh,42px) clamp(22px,4vw,46px) clamp(22px,3.2vh,30px);
  border-radius:2px;
  background-color:var(--p-bg,#e9e0c9);
  background-image:
    var(--p-vline,none),
    var(--p-hline,none),
    linear-gradient(180deg,var(--p-bg,#e9e0c9),var(--p-bg2,#ddd2b4));
  background-size:
    var(--p-lh,39px) 100%,
    100% var(--p-lh,39px),
    100% 100%;
  background-position:0 0, 0 var(--rule-y,26px), 0 0;
  background-repeat:repeat,repeat,no-repeat;
  color:var(--p-ink,#3b3222);
  box-shadow:0 40px 70px rgba(0,0,0,.6), 0 4px 12px rgba(0,0,0,.4);
  scrollbar-width:thin;scrollbar-color:rgba(120,100,70,.35) transparent;
}
.lv-sheet::-webkit-scrollbar{width:6px;}
.lv-sheet::-webkit-scrollbar-thumb{background:rgba(120,100,70,.32);border-radius:3px;}
.lv-sheet::-webkit-scrollbar-track{background:transparent;}
/* 纸边一道极淡的内光，别用 filter —— 会把整张纸上的字重新光栅化 */
.lv-sheet::after{
  content:"";position:absolute;inset:0;pointer-events:none;border-radius:2px;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.2), inset 0 14px 26px -18px rgba(255,255,255,.5);
}

/* 字体：跟写信台同一张映射表 */
.lv-sheet[data-font="hand"]{font-family:var(--font-hand);}
.lv-sheet[data-font="fangsong"]{font-family:"FangSong","STFangsong","仿宋",var(--font-serif);}
.lv-sheet[data-font="kai"]{font-family:"KaiTi","STKaiti","楷体",var(--font-serif);}
.lv-sheet[data-font="song"]{font-family:var(--font-serif);}
.lv-sheet[data-font="xing"]{font-family:"STXingkai","华文行楷","KaiTi","楷体",var(--font-serif);}
.lv-sheet[data-font="thin"]{font-family:"LiSu","STLiti","隶书","Noto Serif SC",serif;letter-spacing:.05em;}

/* 整块纸的竖向节奏都走 --p-lh 的整数倍：
   行高、段距、落款前的空行 —— 否则纸上那些横线就会和字错开，
   一眼看得出是「贴了张背景图」。 */
.lv-head{
  margin:0;font-size:clamp(19px,2.6vw,25px);letter-spacing:.1em;
  color:var(--p-accent,#7e231c);
  line-height:var(--p-lh,34px);
}
.lv-body p{
  margin:0 0 var(--p-lh,34px);text-indent:2em;
  font-size:17px;
  /* 行高跟纸上的横线用同一个变量，字才落在格子里 */
  line-height:var(--p-lh,34px);
  color:var(--p-ink,#3b3222);
  overflow-wrap:break-word;
}
.lv-body p:last-child{margin-bottom:0;}
.lv-body p.empty{text-indent:0;color:var(--p-ink-soft,rgba(59,50,34,.5));font-style:italic;}

.lv-sign{
  margin-top:var(--p-lh,34px);display:flex;flex-direction:column;align-items:flex-end;gap:6px;
  color:var(--p-ink,#3b3222);
}
.lv-date{font-size:15px;letter-spacing:.1em;opacity:.78;line-height:1.7;}
.lv-from{font-size:19px;letter-spacing:.14em;line-height:1.7;}
.lv-from:empty{display:none;}

.lv-foot{
  flex:none;display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:12px;padding:0 4px;
  font-family:var(--font-display);font-size:11px;letter-spacing:.2em;
  color:rgba(236,227,204,.4);
}

@media (max-width:560px){
  .lv-card{padding-top:42px;max-width:100%;}
  .lv-close{padding:6px 10px 6px 8px;font-size:10px;letter-spacing:.14em;}
  .lv-sheet{padding:22px 18px 20px;}
  .lv-body p{font-size:16px;}
  .lv-foot{font-size:10px;letter-spacing:.12em;}
}

/* ============================================================
   结尾 / footer
============================================================ */
.ending{position:relative;z-index:3;padding:clamp(44px,8vh,72px) clamp(20px,5vw,56px) 0;text-align:center;}
.end-line{
  font-family:var(--font-display);font-style:italic;color:var(--gold);
  letter-spacing:.2em;font-size:clamp(13.5px,2vw,16.5px);
}
.end-sign{margin-top:16px;}
.end-sign .hand{font-family:var(--font-hand);font-size:clamp(25px,4.2vw,36px);color:var(--cream);}
.end-sign .stroke{width:210px;height:12px;margin:8px auto 0;}
.end-sign .stroke path{stroke:var(--seal);stroke-width:2.4;fill:none;stroke-linecap:round;}
.footer{
  position:relative;z-index:3;padding:28px 24px 38px;text-align:center;
  font-family:var(--font-display);font-size:11.5px;letter-spacing:.24em;
  color:rgba(141,152,161,.55);text-transform:uppercase;
}
.footer button{
  color:inherit;text-transform:inherit;letter-spacing:inherit;font-size:inherit;
  border-bottom:1px solid rgba(141,152,161,.35);padding:9px 6px;
  transition:color .28s,border-color .28s;
}
.footer button:hover{color:var(--gold);border-bottom-color:rgba(201,168,106,.5);}

/* 角落提示：寄出去 / 后端没开 */
.toast{
  position:fixed;left:50%;bottom:clamp(22px,4vh,42px);z-index:120;
  transform:translate(-50%,14px);
  padding:11px 20px;
  border:1px solid rgba(201,168,106,.4);
  background:rgba(18,10,5,.93);
  color:#efe4c8;font-size:12.5px;letter-spacing:.08em;
  box-shadow:0 14px 30px rgba(0,0,0,.44);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .3s,transform .3s,visibility .3s;
}
.toast.on{opacity:1;visibility:visible;transform:translate(-50%,0);}

/* ============================================================
   响应式
============================================================ */
/* 矮屏笔记本：可用高度不够，信封按 140vh 单独折算 */
@media (min-width:901px) and (max-height:840px){
  .carousel-stage{--env-w:min(62vw, calc(114vh - 260px), 700px);}
  .show-title{top:-22px;}
  .carousel-caption,.show-cta{top:16px;}
}
@media (max-width:900px){
  .bg-verse{display:none;}
  .carousel-stage{--env-w:min(88vw, 57vh, 500px);--letter-out:70;}
}
@media (max-width:820px){
  .site-header .nav .hide-sm{display:none;}
  .style-picker .sp-label{display:none;}
  .step{grid-template-columns:46px 1fr;}
  .desk-bar{flex-wrap:wrap;}
  .style-picker{width:100%;justify-content:center;margin-top:12px;}
}
@media (max-width:860px){
  /* 板子放不下两栏了：信在上，公告在下 */
  .board{grid-template-columns:1fr;min-height:0;gap:clamp(22px,4vw,30px);}
  .board-cap em{display:none;}
  .notice-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;}
  .notice{flex:none;}
  .notice:nth-child(n){margin:0;}
}
@media (max-width:560px){
  .carousel-stage{--env-w:min(88vw, 45vh, 372px);--letter-out:80;--read-shift:clamp(26px,4vh,46px);}
  .carousel-caption{margin-top:16px;}
  .bg-fret i{width:38px;height:38px;}
  .bg-moon{width:54vw;}
  .btn-primary{padding:14px 32px;letter-spacing:.26em;text-indent:.26em;}
  .board{padding:20px 14px 24px;border-width:1px;}
  .board-tape{width:62px;height:19px;top:-8px;}
  .board-tape.t-left{left:18px;}
  .board-tape.t-right{right:18px;}
  .sent-item{padding:22px 15px 15px;}
  .sent-list > :nth-child(n){margin-left:0;margin-right:0;}
  .sent-item .meta{padding-right:38px;}
  .sent-item .meta .to{font-size:16px;}
  .notice-list{grid-template-columns:1fr;}
  .notice{flex:none;padding:13px 14px 14px;}
  .sp{width:32px;height:32px;font-size:15px;}
  .show-title{top:-30px;font-size:clamp(1.36rem,6.9vw,2rem);letter-spacing:.06em;text-indent:0;}
  .stage-nav{width:36px;height:36px;margin-top:-18px;border-color:rgba(201,168,106,.2);}
  .stage-nav svg{width:13px;height:13px;}
  #prevBtn{left:2px;}
  #nextBtn{right:2px;}
}
@media (max-width:760px){
  /* 手机上一块板铺满整屏，两边不留虚化的缝 */
  .mybox{padding:0;}
  .mybox-panel{
    max-width:none;height:100%;border-left:none;border-right:none;
    padding:18px 14px 12px;
    box-shadow:inset 0 0 130px rgba(0,0,0,.5);
  }
  .mybox-tape{display:none;}
  .mybox-head h2{font-size:1.04rem;letter-spacing:.05em;}
  .mybox-eyebrow{font-size:10px;letter-spacing:.3em;}
  .mybox-search{padding:8px 10px;gap:8px;}
  .mybox-input{font-size:12.5px;}
  .mybox-code{padding:9px 10px;gap:7px;}
  .mc-to{font-size:11px;}
  .mc-row{flex-wrap:wrap;}
  .mc-input{width:clamp(140px,44vw,190px);font-size:19px;letter-spacing:.3em;text-indent:.3em;}
  .mc-foot{flex-wrap:wrap;row-gap:6px;}
  .mc-tip{flex:1 0 100%;}
  .mybox-input::placeholder{font-size:11.5px;}
  .mybox-btn{font-size:11px;padding:7px 11px;letter-spacing:.14em;text-indent:.14em;}
  .mybox-hint{font-size:11px;line-height:1.8;}
  .mybox-list{grid-template-columns:1fr;gap:14px;}
  .mybox-foot{margin-top:8px;padding-top:8px;}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .sent-item .countdown{display:none;}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important;}
}