/* 万岁屋 · 离别信 —— 参考「十二号公寓」的做旧纸张 + 宋楷暖调 */
:root{
  --ink:#463venc; --ink:#43371f; --dim:#8a7550; --red:#8c3b1c;
  --paper:#f4ecd6; --paper-e:#e7dabc; --text:#4a3b23; --faint:#9a875c;
  --line:rgba(120,98,54,.32);
  --desk1:#2a1f14; --desk2:#140d07; --gold:#c9a24e;
  --serif:"Songti SC","STSong","SimSun",Georgia,serif;
  --kai:"Kaiti SC","KaiTi","STKaiti",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
img{-webkit-user-drag:none}
@media print{html,body{display:none!important}}
body{
  font-family:var(--serif);color:var(--text);
  background:radial-gradient(ellipse 120% 90% at 50% 25%,var(--desk1),var(--desk2) 80%);
  min-height:100%;overflow-x:hidden;-webkit-text-size-adjust:100%;
  -webkit-user-select:none;user-select:none;
}
.hidden{display:none!important}

/* 背景微尘 */
#dust{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background-image:radial-gradient(1px 1px at 20% 30%,rgba(226,196,138,.5),transparent),
    radial-gradient(1px 1px at 70% 60%,rgba(226,196,138,.4),transparent),
    radial-gradient(1px 1px at 45% 80%,rgba(226,196,138,.35),transparent),
    radial-gradient(1.5px 1.5px at 85% 20%,rgba(226,196,138,.3),transparent),
    radial-gradient(1px 1px at 10% 70%,rgba(226,196,138,.4),transparent);
  background-size:cover}

#wrap{position:relative;z-index:1;max-width:720px;margin:0 auto;
  padding:clamp(20px,5vw,54px) clamp(12px,4vw,26px) 60px;min-height:100vh;
  display:flex;flex-direction:column;justify-content:center}

/* ——— 纸张 ——— */
.paper{position:relative;background:
    radial-gradient(ellipse 100% 55% at 50% 0%,rgba(255,251,235,.55),transparent 62%),
    repeating-linear-gradient(0deg,rgba(120,98,54,.025) 0 1px,transparent 1px 3px),
    linear-gradient(150deg,var(--paper),var(--paper-e) 78%);
  border-radius:3px;
  box-shadow:0 30px 70px rgba(0,0,0,.55),0 8px 22px rgba(0,0,0,.4),
    inset 0 0 60px rgba(120,80,30,.10),inset 0 0 0 1px rgba(120,98,54,.18);
  padding:clamp(26px,6vw,52px) clamp(22px,6vw,54px);
  animation:rise .6s cubic-bezier(.2,.7,.25,1) both}
@keyframes rise{from{opacity:0;transform:translateY(20px)}}
/* 纸张四角做旧压暗 */
.paper::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:3px;
  box-shadow:inset 0 0 34px 4px rgba(90,60,20,.14)}

/* ——— 封面 ——— */
.cover{text-align:center}
.cv-kick{font-family:Georgia,serif;font-size:11px;letter-spacing:.42em;color:var(--faint);
  text-transform:uppercase}
.cv-title{font-size:clamp(30px,8vw,46px);font-weight:800;letter-spacing:.16em;text-indent:.16em;
  margin-top:20px;color:var(--ink)}
.cv-rule{width:34px;height:2px;background:var(--red);margin:20px auto}
.cv-sub{font-family:var(--kai);font-size:clamp(14px,3.6vw,17px);letter-spacing:.28em;
  text-indent:.28em;color:var(--dim)}
.cv-preface{font-family:var(--kai);font-size:clamp(14px,3.5vw,15.5px);line-height:2.15;
  color:var(--text);text-align:left;margin:26px auto 0;max-width:34em;white-space:pre-wrap}
.enter{margin-top:30px;font-family:var(--kai);font-size:15px;letter-spacing:.2em;color:#f0e2bf;
  background:linear-gradient(150deg,#6a4a22,#4a3218);border:1px solid rgba(201,162,78,.5);
  border-radius:3px;padding:12px 30px;cursor:pointer;transition:.2s;
  box-shadow:0 6px 18px rgba(0,0,0,.35)}
.enter:hover{background:linear-gradient(150deg,#7c5628,#5a3d1c);border-color:var(--gold);
  box-shadow:0 8px 24px rgba(201,162,78,.28)}
.enter:active{transform:translateY(1px)}

/* 每封信下方：复刻版说明 + 跨站链接 */
.lt-foot{margin-top:20px;text-align:center}
.lf-note{font-family:var(--kai);font-size:12.5px;line-height:1.95;color:var(--dim);
  margin:0 auto;max-width:30em;padding-top:16px;border-top:1px solid rgba(201,162,78,.28)}
.lf-note b{color:var(--red)}
.lf-links{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.lf-links a{font-family:var(--kai);font-size:13px;letter-spacing:.06em;text-decoration:none;
  color:#e6d3a4;background:rgba(201,162,78,.14);border:1px solid rgba(201,162,78,.4);
  border-radius:20px;padding:8px 16px;transition:.18s}
.lf-links a:hover{background:rgba(201,162,78,.24);border-color:var(--gold);color:#f4e8c6}

/* ——— 顶栏 ——— */
.topbar{display:flex;align-items:center;gap:10px;margin-bottom:16px;
  font-family:var(--kai)}
.tb-btn{font-family:var(--kai);font-size:13px;letter-spacing:.1em;color:#d9c39a;cursor:pointer;
  background:rgba(30,20,10,.4);border:1px solid rgba(201,162,78,.32);border-radius:20px;
  padding:7px 14px;white-space:nowrap;transition:.18s}
.tb-btn:hover{border-color:var(--gold);color:#f0e2bf}
.tb-room{flex:1;text-align:center;color:#e2d2ab;font-size:14px;letter-spacing:.12em}
.tb-room b{color:var(--gold);font-weight:400}

/* ——— 信 ——— */
.letter{min-height:52vh}
.lt-to{font-family:var(--kai);font-size:clamp(20px,5.2vw,27px);color:var(--ink);font-weight:700;
  letter-spacing:.04em}
.lt-tag{font-family:Georgia,serif;font-size:11px;letter-spacing:.14em;color:var(--faint);
  text-transform:uppercase;margin-top:6px}
.lt-rule{width:100%;height:1px;background:var(--line);margin:18px 0 20px;position:relative}
.lt-rule::after{content:"❦";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--paper);padding:0 12px;color:var(--red);font-size:13px}
.lt-body{font-family:var(--kai);font-size:clamp(15px,4vw,16.5px);line-height:2.25;
  color:var(--text);text-align:justify;hanging-punctuation:allow-end}
.lt-body p{margin:0 0 1.1em;text-indent:2em}
.lt-body p:last-child{margin-bottom:0}
.lt-sign{margin-top:30px;text-align:right;font-family:var(--kai)}
.lt-sign .from{font-size:15px;color:var(--ink)}
.lt-sign .date{font-size:12px;color:var(--faint);margin-top:5px;letter-spacing:.08em}
.lt-gone{display:inline-block;margin-top:2px;font-family:var(--kai);font-size:11.5px;
  color:var(--faint);border:1px solid var(--line);border-radius:20px;padding:2px 11px}

/* 已退群的信：纸更旧一点 */
.letter.gone{filter:sepia(.12) brightness(.985)}

/* ——— 翻页 ——— */
.nav{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:22px;
  font-family:var(--kai)}
.nav-btn{font-family:var(--kai);font-size:14px;color:#d9c39a;cursor:pointer;
  background:rgba(30,20,10,.35);border:1px solid rgba(201,162,78,.3);border-radius:22px;
  padding:9px 18px;transition:.18s}
.nav-btn:hover{border-color:var(--gold);color:#f0e2bf}
.nav-btn:disabled{opacity:.3;cursor:default}
.nav-idx{color:#a8956d;font-size:12.5px;letter-spacing:.1em;min-width:74px;text-align:center}

/* ——— 选房间抽屉 ——— */
.scrim{position:fixed;inset:0;z-index:40;background:rgba(8,5,2,.66);backdrop-filter:blur(4px);
  animation:fade .25s}
@keyframes fade{from{opacity:0}}
.drawer{position:fixed;z-index:50;right:0;top:0;bottom:0;width:min(340px,86vw);
  background:linear-gradient(160deg,#241a10,#150d06);border-left:1px solid rgba(201,162,78,.3);
  box-shadow:-20px 0 60px rgba(0,0,0,.6);display:flex;flex-direction:column;
  animation:slidein .28s cubic-bezier(.2,.8,.3,1)}
@keyframes slidein{from{transform:translateX(100%)}}
.dw-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;
  font-family:var(--kai);font-size:16px;color:#e8d8b0;letter-spacing:.14em;
  border-bottom:1px solid rgba(201,162,78,.22)}
.dw-close{font-size:18px;color:#b8a577;cursor:pointer;background:none;border:none;line-height:1}
.dw-body{flex:1;overflow-y:auto;padding:14px 16px 30px}
.floor{margin-bottom:16px}
.fl-tag{font-family:Georgia,serif;font-size:11px;letter-spacing:.2em;color:var(--gold);
  margin:0 0 8px 2px}
.fl-grid{display:flex;flex-wrap:wrap;gap:7px}
.door{font-family:var(--kai);font-size:12.5px;color:#cdb78d;cursor:pointer;
  background:rgba(255,255,255,.04);border:1px solid rgba(201,162,78,.22);border-radius:8px;
  padding:7px 10px;transition:.16s;line-height:1.25;min-width:0}
.door:hover{border-color:var(--gold);color:#f4e8c6;background:rgba(201,162,78,.12)}
.door.on{background:linear-gradient(135deg,#8c3b1c,#6a2c12);border-color:#a8613a;color:#fff}
.door small{opacity:.6}
.door.gone{opacity:.62}

/* ——— 拆信动画 ——— */
.seal{position:fixed;inset:0;z-index:120;display:grid;place-items:center;cursor:pointer;
  background:radial-gradient(ellipse 120% 90% at 50% 30%,var(--desk1),var(--desk2) 82%);
  animation:sealfade .4s ease both}
@keyframes sealfade{from{opacity:0}}
.seal.done{opacity:0;transition:opacity .55s ease;pointer-events:none}
.env{position:relative;width:min(80vw,346px);height:min(53vw,230px);perspective:1000px}
.env-body{position:absolute;inset:0;border-radius:7px;
  background:linear-gradient(158deg,#e9dcb8,#d6c396);
  box-shadow:0 34px 76px rgba(0,0,0,.55),inset 0 0 40px rgba(120,90,40,.14)}
/* 信纸：藏在信封里，拆开时升起放大 */
.env-sheet{position:absolute;left:7%;right:7%;top:7%;bottom:7%;z-index:2;
  background:linear-gradient(#faf4e2,#efe4c8);border-radius:3px;
  box-shadow:0 5px 14px rgba(0,0,0,.22);transform-origin:center bottom;
  display:flex;flex-direction:column;gap:11px;padding:20px 22px}
.env-sheet i{height:2.5px;border-radius:2px;background:rgba(120,98,54,.28)}
.env-sheet i:nth-child(1){width:44%;height:4px;background:rgba(140,59,28,.55)}
.env-sheet i:nth-child(4){width:82%}
.env-sheet i:nth-child(5){width:60%}
/* 信封口袋：上沿是个 V 形，信纸从里面探出来 */
.env-pocket{position:absolute;inset:0;z-index:3;border-radius:7px;
  background:linear-gradient(158deg,#efe3c2,#dccca0);
  clip-path:polygon(0 40%,50% 68%,100% 40%,100% 100%,0 100%);
  box-shadow:inset 0 10px 22px rgba(120,90,40,.16)}
/* 封盖：闭合时朝下的三角，拆开时向上翻起 */
.env-flap{position:absolute;left:0;right:0;top:0;height:56%;z-index:5;transform-origin:top center;
  background:linear-gradient(200deg,#e4d5ac,#c9b488);
  clip-path:polygon(0 0,100% 0,50% 100%);
  box-shadow:0 4px 8px rgba(0,0,0,.15);
  transition:transform .75s cubic-bezier(.5,0,.25,1)}
.wax{position:absolute;left:50%;top:42%;transform:translate(-50%,-50%);z-index:7;
  width:44px;height:44px;border-radius:50%;
  background:radial-gradient(circle at 38% 34%,#c14a2f,#8c2f1a 70%);
  color:#f0d9ac;display:grid;place-items:center;font-family:var(--kai);font-size:17px;
  box-shadow:0 4px 10px rgba(0,0,0,.45),inset 0 2px 4px rgba(255,220,180,.3)}
.seal-hint{position:absolute;bottom:12vh;left:0;right:0;text-align:center;
  font-family:var(--kai);font-size:13px;letter-spacing:.2em;color:#9d8a62;
  animation:hintpulse 1.8s ease-in-out infinite}
@keyframes hintpulse{0%,100%{opacity:.5}50%{opacity:.95}}
/* 触发拆信 */
.seal.open .wax{animation:wax-off .35s cubic-bezier(.4,0,.6,1) forwards}
.seal.open .env-flap{transform:rotateX(-172deg);transition-delay:.32s;z-index:1;
  box-shadow:0 -4px 10px rgba(0,0,0,.2)}
.seal.open .env-sheet{animation:sheet-out 1.05s cubic-bezier(.32,.72,.2,1) .72s forwards}
.seal.open .env-body,.seal.open .env-pocket{animation:env-dim .6s ease 1.1s forwards}
.seal.open .seal-hint{opacity:0;transition:opacity .3s}
@keyframes wax-off{to{transform:translate(-50%,-155%) scale(.4) rotate(28deg);opacity:0}}
@keyframes sheet-out{
  0%{transform:translateY(0) scale(1)}
  42%{transform:translateY(-58%) scale(1.03)}
  100%{transform:translateY(-58%) scale(2.1);opacity:0}
}
@keyframes env-dim{to{opacity:0}}

@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}