/* ============================================================
   shared.css · 全站公共样式
   三页共享：设计变量 / 重置 / 导航 / 开屏动画 / 自定义光标 /
   滚动进度条 / 按钮 / 滚动渐显 / 页脚 / 响应式导航 / 无障碍
   页面特有样式仍保留在各页 <style> 中
   ============================================================ */
:root{
  --bg:#0d0c0a; --bg2:#16130f; --bg3:#1d1914;
  --card:#1b1712; --card2:#251f18; --card3:#2f271d;
  --ink:#f1eadd; --ink2:#b9ab93; --ink3:#8a7c64;
  --line:rgba(241,234,221,.12); --line2:rgba(241,234,221,.2);
  --accent:#d9a441; --accent2:#ecc77f; --accent-dim:rgba(217,164,65,.12);
  --bronze:#b08a55; --bronze2:#d8b57e; --clay:#b06a4a; --clay2:#c98763;
  --hero-bg:#12100b;
  --radius:16px;
  /* 毛玻璃相框参数 */
  --glass-pad:clamp(8px,1.4vw,15px);
  --glass-radius:calc(var(--radius) + 8px);
  --glass-bg:linear-gradient(145deg,rgba(236,199,127,.11),rgba(255,255,255,.025) 55%,rgba(236,199,127,.07));
  --glass-blur:blur(18px) saturate(1.35);
  --glass-line:rgba(241,234,221,.12);
  --glass-hi:inset 0 1px 0 rgba(255,255,255,.16);
  --glass-sh:0 24px 52px rgba(0,0,0,.34);
  --ease:cubic-bezier(.22,.9,.28,1); --ease-soft:cubic-bezier(.4,0,.2,1);
  --nav-h:66px;
  --shadow:0 18px 44px rgba(0,0,0,.3);
}
[data-theme="light"]{
  --bg:#f2eee6; --bg2:#ebe5d9; --bg3:#e3dccb;
  --card:#f8f5ef; --card2:#f1ecdf; --card3:#e9e3d4;
  --ink:#22201a; --ink2:#48402f; --ink3:#6f6551;
  --line:rgba(40,34,24,.16); --line2:rgba(40,34,24,.30);
  --accent:#96691a; --accent2:#7a5410; --accent-dim:rgba(150,105,26,.12);
  --hero-bg:#ece6d8;
  --shadow:0 18px 40px rgba(40,34,24,.16);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html.switching,html.switching *{transition:none!important}
html{scroll-behavior:smooth}
body{
  background-color:var(--bg); color:var(--ink);
  font-family:"Songti SC","STSong","Source Han Serif SC","Noto Serif SC","SimSun",serif;
  line-height:1.8; overflow-x:hidden;
  transition:background .5s var(--ease),color .5s var(--ease);
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
}
::selection{background:rgba(217,164,65,.35)}
a{color:var(--accent2);text-decoration:none}
img{max-width:100%;display:block;user-select:none;-webkit-user-drag:none}
button{font-family:inherit;background:none;border:none;color:inherit;cursor:pointer;-webkit-appearance:none}
/* UI 层（导航/按钮/小字）使用系统无衬线，正文保持衬线艺术风格 */
nav .links a,nav .tools button,.m-close,.lb-btn,.works-index .wi,.tl-fold,.hero .side-tags,.section-head .en{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* 桌面端隐藏原生光标：仅当 JS 光标初始化成功后（html.cursor-on）才隐藏，
   避免 JS 失效时页面没有任何光标 */
@media (pointer:fine){
  html.cursor-on body,
  html.cursor-on body a,
  html.cursor-on body button{cursor:none}
}

/* ============ 开屏打字动画 ============ */
#preloader{
  position:fixed;inset:0;z-index:9999;background:var(--bg);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:opacity .8s cubic-bezier(.16,1,.3,1),visibility .8s ease;
}
#preloader.done{opacity:0;visibility:hidden;pointer-events:none}
#preloader .typing-box{display:flex;align-items:center;justify-content:center;min-height:60px;position:relative}
#preloader .text-container{display:inline-flex;align-items:center;transition:all .5s cubic-bezier(.16,1,.3,1)}
#preloader .text-container.fade-out{opacity:0;transform:translateY(-8px)}
/* DIN 风格英文逐字弹入 */
#preloader .char-item{
  display:inline-block;font-family:"DIN Alternate","DIN Condensed","Oswald","Alte DIN 1451 Mittelschrift",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:clamp(28px,4.5vw,40px);font-weight:300;letter-spacing:.32em;color:var(--ink);text-transform:uppercase;
  opacity:0;transform:translateY(6px) scale(.94);animation:charPopIn .35s cubic-bezier(.16,1,.3,1) forwards;
}
@keyframes charPopIn{to{opacity:1;transform:translateY(0) scale(1)}}
/* 中文修长宋体 */
#preloader .chinese-name{
  position:absolute;font-family:"STFangsong","FangSong","仿宋","Noto Serif SC","Songti SC","SimSun",serif;
  font-size:clamp(30px,4.5vw,42px);font-weight:400;letter-spacing:.4em;color:var(--ink);
  opacity:0;transform:translateY(8px) scaleY(1.08) scaleX(.92);white-space:nowrap;padding-left:.4em;
  transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1);
}
#preloader .chinese-name.is-visible{opacity:1;transform:translateY(0) scaleY(1.08) scaleX(.92)}
/* 纵向呼吸闪烁光标 */
#preloader .typing-cursor{
  display:inline-block;width:1.5px;height:clamp(24px,4vw,34px);background:var(--ink);margin-left:6px;border-radius:1px;
  animation:cursorBlink .9s infinite cubic-bezier(.4,0,.6,1);transition:opacity .2s ease;
}
#preloader .typing-cursor.is-typing{animation:none;opacity:1}
@keyframes cursorBlink{0%,100%{opacity:1}50%{opacity:0}}
/* 底部副标题 */
#preloader .loader-subtext{
  margin-top:clamp(18px,3vw,28px);font-family:"DIN Alternate","DIN Condensed","Oswald",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:11px;letter-spacing:.32em;color:var(--ink3);text-transform:uppercase;font-weight:300;
  opacity:0;transform:translateY(4px);animation:subtextFadeIn .8s ease .3s forwards;
}
@keyframes subtextFadeIn{to{opacity:1;transform:translateY(0)}}

/* ============ 自定义光标 ============ */
.cursor-dot,.cursor-follow{position:fixed;top:0;left:0;z-index:10001;pointer-events:none;border-radius:50%;transform:translate(-50%,-50%)}
@media (pointer:fine){
  .cursor-dot{width:7px;height:7px;background:var(--accent);transition:opacity .2s}
  .cursor-follow{width:24px;height:24px;border:1px solid rgba(217,164,65,.5);transition:width .25s var(--ease),height .25s var(--ease),background .25s,border-color .25s,opacity .2s}
  .cursor-follow.hover{width:34px;height:34px;background:rgba(217,164,65,.1);border-color:rgba(217,164,65,.8)}
  .cursor-follow.view{width:46px;height:46px;background:rgba(217,164,65,.14);border-color:var(--accent2)}
  .cursor-follow.view::after{content:"+";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--accent2);font-size:22px}
}
@media (pointer:coarse){.cursor-dot,.cursor-follow{display:none}}

/* ============ 滚动进度条 ============ */
#scrollbar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));z-index:900;border-radius:0 2px 2px 0}

/* ============ 导航 ============ */
nav{
  position:fixed;top:0;left:0;right:0;z-index:800;height:var(--nav-h);
  display:flex;align-items:center;justify-content:space-between;padding:0 5vw;
  transition:background .4s var(--ease),backdrop-filter .4s,box-shadow .4s,border-color .4s;
  border-bottom:1px solid transparent;
}
nav.scrolled{
  background:var(--bg);
  border-bottom-color:var(--line2);box-shadow:0 1px 0 var(--line);
}
nav .logo{font-size:14px;letter-spacing:.24em;color:var(--ink);display:flex;align-items:center;gap:10px}
nav .logo i{width:9px;height:9px;border-radius:50%;background:var(--accent);display:inline-block;box-shadow:0 0 12px var(--accent)}
nav .logo small{color:var(--ink3);letter-spacing:.12em;font-size:10px}
nav .links{display:flex;align-items:center;gap:6px}
nav .links a{
  position:relative;color:var(--ink2);margin:0 4px;padding:8px 14px;font-size:12.5px;letter-spacing:.16em;border-radius:30px;transition:color .25s,background .25s;
}
nav .links a:hover{color:var(--ink)}
nav .links a.active{color:var(--accent2);background:var(--accent-dim)}
nav .tools{display:flex;align-items:center;gap:10px}
#themeBtn,#langBtn,#printBtn,#fsBtn{
  width:38px;height:38px;border-radius:50%;border:1px solid var(--line2);background:transparent;color:var(--ink);
  display:flex;align-items:center;justify-content:center;transition:.3s var(--ease);
}
#themeBtn{font-size:15px}
#themeBtn:hover{border-color:var(--accent);transform:rotate(20deg)}
#langBtn{
  font-size:12px;font-weight:600;letter-spacing:.02em;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
#printBtn{font-size:15px}
#fsBtn{
  font-size:12px;font-weight:700;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
#themeBtn:hover,#langBtn:hover,#printBtn:hover,#fsBtn:hover{border-color:var(--accent);color:var(--accent2)}
nav .burger{display:none;background:none;border:1px solid var(--line2);color:var(--ink);font-size:18px;width:38px;height:38px;border-radius:10px}
/* 开屏结束后导航入场（caldera 式编排；无 JS 时不加 yz-entered，导航保持可见） */
html.yz-entered nav{animation:navIn .55s var(--ease) .05s both}
@keyframes navIn{from{opacity:0;transform:translateY(-14px)}to{opacity:1;transform:none}}

/* ============ 按钮 ============ */
.btn{
  position:relative;overflow:hidden;border:1px solid var(--line2);padding:14px 32px;border-radius:40px;
  color:var(--ink);letter-spacing:.2em;font-size:12.5px;transition:.35s var(--ease);background:transparent;
}
.btn::after{content:"";position:absolute;inset:0;background:var(--accent-dim);transform:translateY(101%);transition:transform .4s var(--ease)}
.btn:hover::after{transform:translateY(0)}
.btn>*{position:relative;z-index:1}
.btn.solid{background:var(--accent);border-color:var(--accent);color:#1a1407}
.btn.solid::after{background:rgba(0,0,0,.12)}
.btn:hover{transform:translateY(-2px);letter-spacing:.28em;box-shadow:0 14px 34px rgba(0,0,0,.35)}

/* ============ 滚动叙事渐显 ============ */
.rv{opacity:0;transform:translateY(40px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}
/* caldera 式缩放入场：卡片类元素用 scale+fade */
.rv.zoom{transform:translateY(24px) scale(.94)}
.rv.zoom.in{transform:none}
.stagger>*{opacity:0;transform:translateY(34px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.stagger.in>*{opacity:1;transform:none}
.stagger.in>*:nth-child(1){transition-delay:.05s}
.stagger.in>*:nth-child(2){transition-delay:.14s}
.stagger.in>*:nth-child(3){transition-delay:.23s}
.stagger.in>*:nth-child(4){transition-delay:.32s}
.stagger.in>*:nth-child(5){transition-delay:.41s}
.stagger.in>*:nth-child(6){transition-delay:.5s}
.stagger.in>*:nth-child(7){transition-delay:.59s}
.stagger.in>*:nth-child(8){transition-delay:.68s}

/* ============ 页脚 ============ */
footer{padding:44px 6vw 60px;text-align:center;color:var(--ink3);font-size:11.5px;letter-spacing:.22em;border-top:1px solid var(--line)}
footer .up{display:inline-block;margin-top:18px;color:var(--accent2);font-size:12px;letter-spacing:.2em}
footer .vnote{margin-top:8px;font-size:10px;color:var(--ink3);letter-spacing:.1em}

/* ============ 响应式：移动端导航 ============ */
@media(max-width:900px){
  nav .links{
    display:none;position:absolute;top:var(--nav-h);left:0;right:0;flex-direction:column;align-items:stretch;
    background:color-mix(in srgb,var(--bg) 92%,transparent);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
    padding:14px 6vw 22px;border-bottom:1px solid var(--line);
  }
  nav .links.show{display:flex}
  nav .links a{padding:13px 16px}
  nav .burger{display:flex;align-items:center;justify-content:center}
  section{padding:80px 5vw}
  .hero-inner{padding:0 6vw}
  .hero .side-tags{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s!important;transition-duration:.001s!important}
}