/* ============================================================
   蓬莱仙岛（源端复古） · 全站共用样式
   ============================================================ */
:root{
  color-scheme:dark;
  --ink-0:#070a08;
  --ink-1:#0b100d;
  --ink-2:#0f1612;
  --ink-3:#141d17;
  --ink-4:#1a251d;
  --gold-1:#f6e7c8;
  --gold-2:#ddbe86;
  --gold-3:#b4935c;
  --gold-4:#7d6539;
  --paper:#f4ecdb;
  --text:#dbd7ca;
  --muted:#9c9e91;
  --dim:#7b7e73;
  --line:rgba(221,190,134,.16);
  --line-2:rgba(221,190,134,.34);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","Hiragino Sans GB",sans-serif;
  --w:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:92px;
  background:var(--ink-1);
}
body{
  margin:0;
  overflow-x:hidden;
  background:transparent;
  color:var(--text);
  font:400 15px/1.85 var(--sans);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.035;
  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='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
img{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,ul,dl,dd,figure{margin:0}
ul{padding:0;list-style:none}
::selection{background:rgba(221,190,134,.26);color:#fff}
:focus-visible{outline:2px solid var(--gold-2);outline-offset:4px}

.wrap{width:min(var(--w),calc(100% - 56px));margin-inline:auto;position:relative;z-index:1}

/* ---------- 固定页面背景（滚动时不动） ---------- */
.page-bg{
  position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:#0b100d url("./bg-main.jpg") center 44%/cover no-repeat;
}
.page-bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,10,8,.08) 0%,rgba(7,10,8,.14) 44%,rgba(7,10,8,.40) 100%);
}
/* 内页阅读场景加深一层，保证正文可读 */
body.is-doc .page-bg{
  inset:-28px;
  background-image:url("./bg-soft.jpg"); /* 小尺寸柔化版，模糊后无差别，省 ~220KB */
  filter:blur(11px) saturate(.82) brightness(.92);
}
body.is-doc .page-bg::after{
  background:linear-gradient(180deg,rgba(7,10,8,.58) 0%,rgba(7,10,8,.74) 45%,rgba(7,10,8,.84) 100%);
}

/* ---------- 通用文字 ---------- */
.kicker{
  display:inline-flex;align-items:center;gap:12px;
  color:var(--gold-2);font-size:11px;letter-spacing:.3em;line-height:1;
  text-transform:uppercase;
}
.kicker::before{content:"";width:30px;height:1px;background:linear-gradient(90deg,transparent,var(--gold-3))}
.kicker--plain::before{display:none}

/* ---------- 按钮 ---------- */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:50px;padding:0 30px;border:1px solid transparent;
  font-family:var(--sans);font-size:13px;font-weight:500;letter-spacing:.14em;
  cursor:pointer;transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s,border-color .3s,color .3s;
}
.btn i{font-style:normal;font-size:11px;opacity:.8;transition:transform .3s var(--ease)}
.btn:hover i{transform:translate(2px,-2px)}
.btn--gold{
  background:linear-gradient(135deg,#f4e4c2 0%,#dcbe86 42%,#b4935c 100%);
  color:#1d1708;font-weight:600;
}
.btn--gold:hover{transform:translateY(-2px);box-shadow:0 14px 34px -14px rgba(221,190,134,.75)}
.btn--ghost{border-color:var(--line-2);color:var(--gold-1);background:rgba(255,255,255,.015)}
.btn--ghost:hover{border-color:rgba(221,190,134,.72);background:rgba(221,190,134,.07);transform:translateY(-2px)}
.btn--sm{min-height:42px;padding:0 20px;font-size:12px}

.lnk{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--gold-2);font-size:12.5px;letter-spacing:.08em;
  border-bottom:1px solid rgba(221,190,134,.28);padding-bottom:3px;
  transition:color .25s,border-color .25s;
}
.lnk:hover{color:var(--gold-1);border-color:var(--gold-2)}

/* ---------- 顶部导航 ---------- */
.site-head{
  position:fixed;inset:0 0 auto;z-index:60;height:86px;
  display:flex;align-items:center;
  border-bottom:1px solid transparent;
  transition:height .35s var(--ease),background .35s,border-color .35s,box-shadow .35s;
}
.site-head.is-stuck{
  height:72px;
  background:rgba(8,12,9,.9);
  backdrop-filter:blur(20px) saturate(1.3);
  -webkit-backdrop-filter:blur(20px) saturate(1.3);
  border-bottom-color:var(--line);
  box-shadow:0 18px 40px -30px #000;
}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;width:min(var(--w),calc(100% - 56px))}
.brand{display:flex;align-items:center;gap:14px;flex:none}
.brand img{display:block;height:46px;width:auto;filter:drop-shadow(0 3px 12px rgba(0,0,0,.55));transition:height .35s var(--ease)}
.is-stuck .brand img{height:38px}
.brand__seal{
  display:grid;place-items:center;width:38px;height:38px;
  border:1px solid rgba(221,190,134,.42);color:var(--gold-2);
  font-family:var(--serif);font-size:11px;line-height:1.15;letter-spacing:.04em;text-align:center;
}
.nav{display:flex;align-items:center;gap:clamp(14px,2vw,30px)}
.nav a{
  position:relative;color:#c9c6ba;font-size:12.5px;letter-spacing:.1em;
  padding:6px 0;transition:color .25s;
}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold-2),transparent);
  transform:scaleX(0);transform-origin:center;transition:transform .3s var(--ease);
}
.nav a:hover,.nav a[aria-current="page"]{color:var(--gold-1)}
.nav a[aria-current="page"]::after{transform:scaleX(1)}
.nav a:hover::after{transform:scaleX(1)}
.head-cta{flex:none}
.burger{
  display:none;width:44px;height:44px;padding:0;border:1px solid rgba(221,190,134,.5);
  background:rgba(8,12,9,.55);cursor:pointer;flex:none;
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.burger span{display:block;width:18px;height:1px;margin:5px auto;background:var(--gold-2);transition:transform .3s,opacity .3s}
.burger[aria-expanded="true"] span:first-child{transform:translateY(3px) rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{transform:translateY(-3px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-foot{
  position:relative;z-index:1;
  border-top:1px solid var(--line);
  background:rgba(6,9,7,.9);
  padding:34px 0 30px;
  color:var(--dim);font-size:12px;
}
.foot-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px 32px}
.foot-brand{display:flex;align-items:center;gap:12px;color:var(--muted)}
.foot-brand img{height:26px;width:auto;opacity:.75}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px}
.foot-links a{color:#a9a596;transition:color .25s}
.foot-links a:hover{color:var(--gold-2)}
.foot-copy{width:100%;padding-top:16px;border-top:1px solid rgba(221,190,134,.08);color:#63665c;font-size:11px;letter-spacing:.04em}

/* ---------- 回到顶部 ---------- */
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:40;
  display:grid;place-items:center;width:44px;height:44px;
  border:1px solid var(--line-2);background:rgba(9,14,11,.92);
  color:var(--gold-2);font-size:14px;
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .3s,transform .3s,background .3s,border-color .3s;
  backdrop-filter:blur(12px);
}
.to-top.is-on{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{background:rgba(221,190,134,.12);border-color:var(--gold-2)}

/* ---------- 图片查看器 ---------- */
.viewer{
  width:min(1080px,calc(100vw - 28px));max-width:none;max-height:94svh;
  padding:0;border:1px solid var(--line-2);background:var(--ink-2);color:var(--text);
}
.viewer::backdrop{background:rgba(4,7,5,.88);backdrop-filter:blur(6px)}
.viewer__bar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px 16px;border-bottom:1px solid var(--line);
  color:var(--gold-2);font-size:12px;letter-spacing:.1em;
}
.viewer__bar button{
  padding:6px 14px;border:1px solid var(--line-2);background:transparent;
  color:var(--gold-1);font:inherit;font-size:11px;cursor:pointer;transition:background .2s;
}
.viewer__bar button:hover{background:rgba(221,190,134,.12)}
.viewer img{display:block;width:100%;max-height:calc(94svh - 52px);object-fit:contain;background:var(--ink-0)}
.viewer video{display:block;width:100%;max-height:calc(94svh - 52px);background:#000}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.09s}
.reveal[data-d="2"]{transition-delay:.18s}
.reveal[data-d="3"]{transition-delay:.27s}
.reveal[data-d="4"]{transition-delay:.36s}
.reveal[data-d="5"]{transition-delay:.45s}
.reveal[data-d="6"]{transition-delay:.54s}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .nav{gap:16px}
  .nav a{font-size:12px}
}
@media(max-width:920px){
  .site-head{height:72px}
  .brand img{height:40px}
  .brand__seal{display:none}
  .nav,.head-cta{display:none}
  .burger{display:block}
  .nav.is-open{
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    position:fixed;top:72px;right:0;left:0;
    padding:10px 24px 24px;
    background:rgba(8,12,9,.98);
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(20px);
    box-shadow:0 30px 50px -30px #000;
  }
  .nav.is-open a{padding:14px 4px;font-size:14px;border-bottom:1px solid rgba(221,190,134,.1)}
  .nav.is-open a::after{display:none}
}
@media(max-width:920px){
  .page-bg{background-position:14% center}
}
@media(max-width:620px){
  .wrap,.head-inner{width:calc(100% - 36px)}
  html{scroll-padding-top:78px}
  .btn{width:100%;min-height:48px}
  .foot-inner{flex-direction:column;align-items:flex-start}
  .to-top{right:14px;bottom:14px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}