:root{
  --paper:#f3f0e9;
  --paper-2:#eae6dc;
  --ink:#23201d;
  --ink-2:#4a443d;
  --ink-3:#7a7267;
  --line:#d5cfc2;
  --rust:#9c4a32;
  --rust-2:#b8613f;
  --steel:#5b6d78;
  --moss:#5c6b4a;
  --serif:"Songti SC","Noto Serif SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --max:760px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}

/* ---------- 顶部 ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(243,240,233,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-in{
  max-width:var(--max);margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.nav-brand{font-family:var(--serif);font-size:15px;letter-spacing:.08em;white-space:nowrap}
.nav-links{display:flex;gap:16px;font-size:13px;color:var(--ink-2)}
.nav-links a{padding:2px 0;border-bottom:1px solid transparent}
.nav-links a:hover{border-color:var(--rust)}
@media(max-width:520px){
  .nav-links{gap:12px;font-size:12px}
  .nav-brand{font-size:13px}
}

/* ---------- 封面 ---------- */
.hero{position:relative;height:88vh;min-height:520px;max-height:820px;overflow:hidden;background:#c9c4b8}
.hero img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:grayscale(.35) contrast(1.02) brightness(.92);
  animation:heroIn 2.4s cubic-bezier(.2,.8,.2,1) both;
}
@keyframes heroIn{from{transform:scale(1.08);opacity:.4}to{transform:scale(1);opacity:1}}
.hero::before{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(100deg,rgba(12,10,9,.66) 0%,rgba(12,10,9,.38) 40%,rgba(12,10,9,0) 72%);
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(to top,rgba(14,12,10,.94) 0%,rgba(14,12,10,.62) 30%,rgba(14,12,10,.12) 62%,rgba(14,12,10,.22) 100%);
}
.hero-in{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  max-width:var(--max);margin:0 auto;padding:0 24px 46px;color:#f6f2e8;
}
.hero-kicker{font-size:12px;letter-spacing:.34em;opacity:.78;margin-bottom:14px}
.hero h1{
  font-family:var(--serif);font-size:clamp(40px,11vw,68px);
  line-height:1.08;letter-spacing:.03em;font-weight:600;
  text-shadow:0 2px 8px rgba(0,0,0,.55),0 6px 40px rgba(0,0,0,.45);
}
.hero h1 small{display:block;font-size:.34em;letter-spacing:.42em;opacity:.72;margin-top:14px;font-weight:400}
.hero-lead{margin-top:18px;font-size:15px;line-height:1.9;opacity:.9;max-width:30em}
.hero-meta{margin-top:22px;font-size:12px;opacity:.62;letter-spacing:.05em}
.scroll-hint{
  position:absolute;left:50%;bottom:14px;transform:translateX(-50%);z-index:3;
  color:#f6f2e8;opacity:.55;font-size:11px;letter-spacing:.2em;text-align:center;
  animation:bob 2.2s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,6px)}}

/* ---------- 通用块 ---------- */
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.sec{padding-top:64px;padding-bottom:20px}
.sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:10px}
.sec-no{font-family:var(--serif);font-size:12px;letter-spacing:.3em;color:var(--rust)}
.sec-title{font-family:var(--serif);font-size:clamp(24px,6vw,32px);letter-spacing:.06em;font-weight:600}
.sec-desc{color:var(--ink-2);font-size:14.5px;line-height:2;margin:14px 0 34px;max-width:34em}
.rule{height:1px;background:var(--line);margin:0}

/* ---------- 序：台账 ---------- */
.preface{padding-top:56px;padding-bottom:8px}
.preface-figure{margin:0 0 26px;position:relative}
.preface-figure img{width:100%;filter:contrast(1.03) saturate(.94)}
.preface-figure figcaption{font-size:12px;color:var(--ink-3);margin-top:10px;letter-spacing:.04em}
.preface-text{font-family:var(--serif);font-size:17px;line-height:2.05;color:var(--ink)}
.preface-text p+p{margin-top:16px}
.preface-text em{font-style:normal;background:linear-gradient(transparent 62%,rgba(156,74,50,.22) 62%)}

/* ---------- 时间线 ---------- */
.tl{position:relative;margin-top:8px}
.tl::before{
  content:"";position:absolute;left:7px;top:6px;bottom:6px;width:1px;background:var(--line);
}
.tl-item{position:relative;padding:0 0 40px 32px}
.tl-item::before{
  content:"";position:absolute;left:3px;top:9px;width:9px;height:9px;border-radius:50%;
  background:var(--paper);border:1.5px solid var(--rust);
}
.tl-item.now::before{background:var(--rust)}
.tl-year{
  font-family:var(--serif);font-size:22px;letter-spacing:.06em;line-height:1.2;
  display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;
}
.tl-tag{
  font-family:var(--sans);font-size:10.5px;letter-spacing:.14em;color:var(--ink-3);
  border:1px solid var(--line);border-radius:2px;padding:1px 6px;
}
.tl-tag.personal{color:var(--rust);border-color:rgba(156,74,50,.4)}
.tl-title{font-family:var(--serif);font-size:17px;margin:6px 0 8px;letter-spacing:.03em}
.tl-text{font-size:14.5px;line-height:1.95;color:var(--ink-2)}
.tl-text strong{color:var(--ink);font-weight:600}
.tl-img{margin:16px 0 0;position:relative;overflow:hidden;background:var(--paper-2)}
.tl-img img{width:100%;height:230px;object-fit:cover;filter:contrast(1.02) saturate(.92);transition:transform .8s}
.tl-img:hover img{transform:scale(1.03)}
.tl-img figcaption{position:absolute;left:8px;bottom:8px;padding:4px 9px;font-size:10.5px;color:#f6f1e4;
  background:rgba(14,12,10,.58);backdrop-filter:blur(4px);letter-spacing:.04em;border-radius:1px}
.tl-personal{
  margin-top:14px;padding:12px 14px;border-left:2px solid rgba(156,74,50,.35);
  background:rgba(156,74,50,.045);font-size:13.5px;color:var(--rust);
}
.tl-collect{
  margin-top:14px;border:1px dashed var(--line);padding:14px;
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
}
.tl-collect p{font-size:12.5px;color:var(--ink-3);line-height:1.7}
.btn-mini{
  font-size:12px;letter-spacing:.08em;color:var(--rust);border:1px solid rgba(156,74,50,.45);
  padding:6px 12px;border-radius:2px;white-space:nowrap;transition:.2s;background:none;cursor:pointer;font-family:var(--sans)
}
.btn-mini:hover{background:var(--rust);color:#fff;border-color:var(--rust)}

/* ---------- 相册 ---------- */
.chapter{margin-bottom:54px}
.chapter-head{padding:26px 0 16px;border-top:1px solid var(--line)}
.chapter-no{font-family:var(--serif);font-size:12px;letter-spacing:.3em;color:var(--rust)}
.chapter-title{font-family:var(--serif);font-size:clamp(21px,5.4vw,27px);letter-spacing:.05em;margin-top:4px;font-weight:600}
.chapter-intro{font-size:13.5px;line-height:1.95;color:var(--ink-2);margin-top:12px;max-width:36em}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:18px}
.grid .ph{position:relative;overflow:hidden;aspect-ratio:4/3;background:var(--paper-2);cursor:zoom-in}
.grid .ph img{width:100%;height:100%;object-fit:cover;filter:contrast(1.03) saturate(.92);transition:transform .7s,filter .4s}
.grid .ph:hover img{transform:scale(1.04)}
.grid .ph:first-child{grid-column:1/-1;aspect-ratio:16/10}
.grid .ph span{
  position:absolute;left:0;right:0;bottom:0;padding:18px 8px 6px;font-size:11px;color:#f4efe3;
  background:linear-gradient(to top,rgba(15,13,11,.6),transparent);opacity:0;transition:.3s;
}
.grid .ph:hover span{opacity:1}
@media(min-width:760px){.grid{grid-template-columns:1fr 1fr 1fr}.grid .ph:first-child{grid-column:1/-1}}

/* ---------- 灯箱 ---------- */
.lb{position:fixed;inset:0;z-index:200;background:#14120f;display:none;flex-direction:column;
  justify-content:center}
.lb.on{display:flex}
.lb-stage{flex:0 1 auto;display:flex;align-items:center;justify-content:center;padding:46px 12px 0;min-height:0}
.lb-stage img{max-width:100%;max-height:64vh;object-fit:contain}
.lb-info{padding:14px 20px 22px;color:#e8e1d2;max-width:var(--max);margin:0 auto;width:100%;flex:0 0 auto}
.lb-note{font-size:14px;line-height:1.85}
.lb-fact{font-size:12.5px;line-height:1.8;color:#a9a08d;margin-top:8px;padding-top:8px;border-top:1px solid rgba(255,255,255,.12)}
.lb-close{position:absolute;top:14px;right:16px;width:34px;height:34px;border:none;background:rgba(255,255,255,.1);
  color:#e8e1d2;font-size:19px;border-radius:50%;cursor:pointer}
.lb-nav{position:absolute;top:50%;transform:translateY(-50%);width:40px;height:56px;border:none;
  background:rgba(255,255,255,.07);color:#e8e1d2;font-size:20px;cursor:pointer}
.lb-prev{left:0}.lb-next{right:0}

/* ---------- 征集 ---------- */
.collect-box{border:1px solid var(--line);background:var(--paper-2);padding:26px 20px;margin-top:8px}
.collect-box h3{font-family:var(--serif);font-size:19px;letter-spacing:.05em;margin-bottom:10px}
.collect-box p{font-size:13.5px;line-height:1.95;color:var(--ink-2)}
.form{margin-top:20px;display:grid;gap:14px}
.field{display:grid;gap:6px}
.field label{font-size:12px;letter-spacing:.1em;color:var(--ink-3)}
.field input,.field select,.field textarea{
  font-family:var(--sans);font-size:15px;padding:11px 12px;border:1px solid var(--line);
  background:#fbf9f4;color:var(--ink);border-radius:2px;width:100%;
}
.field textarea{min-height:88px;resize:vertical;line-height:1.7}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--rust)}
.drop{
  border:1px dashed var(--line);padding:22px 14px;text-align:center;cursor:pointer;
  font-size:13px;color:var(--ink-3);background:#fbf9f4;transition:.2s;
}
.drop:hover,.drop.has{border-color:var(--rust);color:var(--rust)}
.drop img{max-height:150px;margin:10px auto 0;object-fit:contain}
.btn{
  font-family:var(--sans);font-size:14.5px;letter-spacing:.12em;padding:13px 18px;
  background:var(--rust);color:#fff;border:none;border-radius:2px;cursor:pointer;transition:.2s;
}
.btn:hover{background:#853c28}
.btn:disabled{opacity:.5;cursor:default}
.form-note{font-size:12px;color:var(--ink-3);line-height:1.7}
.msg{font-size:13.5px;padding:10px 12px;border-left:2px solid var(--moss);background:rgba(92,107,74,.08);display:none}
.msg.err{border-color:var(--rust);background:rgba(156,74,50,.08)}
.msg.on{display:block}

.wall{margin-top:34px}
.wall-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
@media(min-width:700px){.wall-grid{grid-template-columns:1fr 1fr 1fr}}
.wall-card{border:1px solid var(--line);background:#fbf9f4}
.wall-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.wall-card .cap{padding:10px 11px 12px}
.wall-card .who{font-size:12px;color:var(--rust);letter-spacing:.06em}
.wall-card .say{font-size:12.5px;line-height:1.75;color:var(--ink-2);margin-top:4px}
.wall-empty{font-size:13px;color:var(--ink-3);margin-top:14px}

/* ---------- 电子相册入口 ---------- */
.album-cta{
  margin:40px 0 10px;padding:34px 22px;background:var(--ink);color:#f2ecdd;
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
}
.album-cta h3{font-family:var(--serif);font-size:21px;letter-spacing:.06em}
.album-cta p{font-size:12.5px;opacity:.7;margin-top:6px;line-height:1.8}
.album-cta a{
  font-size:13px;letter-spacing:.12em;border:1px solid rgba(242,236,221,.45);
  padding:10px 16px;white-space:nowrap;
}
.album-cta a:hover{background:#f2ecdd;color:var(--ink)}

/* ---------- 页脚 ---------- */
.foot{margin-top:56px;padding:34px 0 54px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-3);line-height:2}
.foot a{border-bottom:1px solid var(--line)}

/* 进场动画 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero img{animation:none}
  .scroll-hint{animation:none}
}