/* ==========================================================================
   月博登录中心 · 共享样式 /assets/site.css
   深空蓝底 + 月银白文字 + 暖金焦点 + 奶油纸页阅读区
   ========================================================================== */

:root{
  --space:#071426;
  --midnight:#0F2440;
  --silver:#E8EDF4;
  --paper:#F4EFE4;
  --gold:#D8A94A;
  --gold-soft:rgba(216,169,74,.14);
  --teal:#6FD3D9;
  --violet:#8B7BD8;
  --ink:#2C241D;
  --eclipse:#B8543C;
  --line:#2A3B52;
  --dim:rgba(232,237,244,.68);
  --dimmer:rgba(232,237,244,.44);
  --wrap:1180px;
  --font-title:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--space)}
body,
h1,h2,h3,h4,p,ul,ol,li,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
main{display:block}
#main-content{scroll-margin-top:20px}

body{
  background-color:var(--space);
  background-image:
    radial-gradient(900px 520px at 84% -10%, rgba(139,123,216,.15), transparent 70%),
    radial-gradient(700px 440px at 2% 4%, rgba(111,211,217,.09), transparent 72%);
  background-repeat:no-repeat;
  color:var(--silver);
  font-family:var(--font-body);
  font-size:clamp(15.5px,1.05vw,16.5px);
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

/* ---------- 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}

.section{position:relative;padding-block:clamp(46px,7vw,86px)}
.section--mid{background:var(--midnight)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper .display,
.section--paper .h2,
.section--paper .h3{color:var(--ink)}
.section--paper .kicker{color:#9A6A32}
.section--paper .lede,
.section--paper .prose,
.section--paper .note{color:rgba(44,36,29,.78)}
.section--paper .tag{border-color:rgba(44,36,29,.24);color:rgba(44,36,29,.72)}

.layout-asym{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(24px,4vw,44px)}
@media (min-width:900px){
  .layout-asym{grid-template-columns:minmax(64px,96px) minmax(0,1fr) minmax(180px,220px)}
  .layout-asym--wide{grid-template-columns:minmax(80px,120px) minmax(0,1fr) minmax(200px,260px)}
}
.col-index{display:flex;flex-direction:column;gap:12px}
.col-note{display:flex;flex-direction:column;gap:18px}

/* ---------- 文字层级 ---------- */
.display{
  font-family:var(--font-title);
  font-weight:700;
  font-size:clamp(32px,5vw,54px);
  line-height:1.14;
  letter-spacing:.045em;
  color:var(--silver);
}
.h2{
  font-family:var(--font-title);
  font-weight:600;
  font-size:clamp(22px,2.9vw,31px);
  line-height:1.32;
  letter-spacing:.04em;
  color:var(--silver);
}
.h3{
  font-family:var(--font-title);
  font-weight:600;
  font-size:clamp(17px,2vw,20px);
  line-height:1.4;
  letter-spacing:.035em;
  color:var(--silver);
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--gold);
}
.kicker::before{content:"";width:22px;height:1px;background:currentColor;opacity:.75}
.lede{
  max-width:38em;
  font-size:clamp(15.5px,1.5vw,18px);
  line-height:1.85;
  color:var(--dim);
}
.prose{max-width:36em;font-size:16.5px;line-height:1.85}
.prose p + p{margin-top:1em}
.prose strong{font-weight:600;color:var(--silver)}

/* ---------- 页头 ---------- */
.skip-link{
  position:fixed;
  top:-70px;left:14px;
  z-index:200;
  padding:10px 18px;
  border-radius:2px;
  background:var(--gold);
  color:#1B1206;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:relative;
  z-index:20;
  isolation:isolate;
  background:var(--space);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(440px 230px at 90% -14%, rgba(139,123,216,.24), transparent 72%),
    radial-gradient(360px 210px at 4% -6%, rgba(111,211,217,.13), transparent 74%);
}

.progress{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:120;
  background:rgba(232,237,244,.07);
  pointer-events:none;
}
.progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal),var(--violet) 58%,var(--gold));
  transition:transform .12s linear;
}

.header-top{padding-block:15px}
.header-top__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
}

.brand{display:inline-flex;align-items:center;gap:14px}
.brand__mark{
  position:relative;
  flex:none;
  width:34px;height:34px;
  border-radius:50%;
  background:linear-gradient(140deg,var(--teal),var(--violet) 58%,var(--gold));
  box-shadow:
    inset -9px 0 0 0 var(--space),
    0 0 0 1px rgba(232,237,244,.16),
    0 0 22px rgba(111,211,217,.26);
}
.brand__text{display:flex;flex-direction:column;gap:4px}
.brand__name{
  font-family:var(--font-title);
  font-weight:700;
  font-size:19px;
  letter-spacing:.07em;
  line-height:1.18;
  color:var(--silver);
}
.brand__line{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--dimmer);
}

.header-tools{display:flex;align-items:center;gap:10px}

/* 下拉面板（站点地图 / 页面切换） */
.disclose{position:relative}
.disclose__btn{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--silver);
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.disclose__label{white-space:nowrap}
.disclose__btn:hover{border-color:rgba(216,169,74,.6);color:var(--gold)}
.disclose__btn[aria-expanded="true"]{
  border-color:var(--gold);
  color:var(--gold);
  background:var(--gold-soft);
}
.disclose__caret{
  width:6px;height:6px;
  border-right:1px solid currentColor;
  border-bottom:1px solid currentColor;
  transform:rotate(45deg) translate(-1px,-2px);
  transition:transform .22s var(--ease);
}
.disclose__btn[aria-expanded="true"] .disclose__caret{transform:rotate(225deg) translate(-1px,-2px)}
.disclose__panel{
  position:absolute;
  top:calc(100% + 12px);
  right:0;
  z-index:40;
  min-width:240px;
  padding:14px;
  background:var(--midnight);
  border:1px solid var(--line);
  border-radius:3px;
  box-shadow:0 22px 48px rgba(0,0,0,.5);
}
.disclose--left .disclose__panel{right:auto;left:0}
.disclose__panel[hidden]{display:none}
.disclose__title{
  margin-bottom:8px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  color:var(--dimmer);
  text-transform:uppercase;
}
.disclose__list{display:grid;gap:2px}
.disclose__link{
  display:grid;
  grid-template-columns:38px minmax(0,1fr);
  align-items:baseline;
  gap:8px;
  padding:7px 8px;
  border-left:1px solid transparent;
  font-size:14px;
  color:var(--silver);
  transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.disclose__link:hover{background:rgba(232,237,244,.06);border-left-color:var(--gold);color:#fff}
.disclose__num{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.08em;
  color:var(--gold);
}

/* 移动端栏目按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 13px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--silver);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(216,169,74,.6);color:var(--gold)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;height:12px;
  background:linear-gradient(currentColor,currentColor) center/100% 1.5px no-repeat;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;height:1.5px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle__text{white-space:nowrap}
.site-header[data-open] .nav-toggle{border-color:var(--gold);color:var(--gold);background:var(--gold-soft)}
.site-header[data-open] .nav-toggle__bars{background:none}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

/* 栏目带 */
.header-nav{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--midnight),#0C1E36);
}
.header-nav__inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.main-nav{width:100%}
.main-nav__list{display:flex;flex-wrap:wrap;gap:2px}
.main-nav__item{min-width:0}
.main-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:9px;
  padding:14px 15px;
  font-size:14px;
  letter-spacing:.03em;
  white-space:nowrap;
  color:var(--dim);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.main-nav__num{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:rgba(232,237,244,.36);
  transition:color .2s var(--ease);
}
.main-nav__link::after{
  content:"";
  position:absolute;
  left:15px;right:15px;bottom:0;
  height:2px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease);
}
.main-nav__link:hover{color:var(--silver);background:rgba(232,237,244,.045)}
.main-nav__link:hover::after{transform:scaleX(1)}
.main-nav__link:hover .main-nav__num{color:rgba(216,169,74,.8)}
.main-nav__link[aria-current="page"]{color:#fff}
.main-nav__link[aria-current="page"] .main-nav__num{color:var(--gold)}
.main-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- 页脚 ---------- */
.site-footer{
  --footer-bg:#0B1B2F;
  position:relative;
  background:var(--footer-bg);
  border-top:1px solid var(--line);
  color:var(--silver);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(620px 300px at 88% 120%, rgba(139,123,216,.18), transparent 70%);
}
.footer-top{
  position:relative;
  display:grid;
  grid-template-columns:1.4fr .8fr .9fr 1.3fr;
  gap:clamp(24px,3.4vw,46px);
  padding-block:clamp(38px,5vw,58px) clamp(30px,4vw,46px);
}
.footer-brand__name{
  font-family:var(--font-title);
  font-weight:700;
  font-size:18px;
  letter-spacing:.07em;
  color:var(--silver);
}
.footer-brand__text{
  margin-top:12px;
  max-width:26em;
  font-size:14px;
  line-height:1.8;
  color:var(--dim);
}
.moon-track{display:flex;align-items:center;gap:10px;margin-top:22px}
.moon-phase{
  width:18px;height:18px;
  border-radius:50%;
  background:linear-gradient(140deg,var(--teal),var(--violet));
  box-shadow:0 0 12px rgba(111,211,217,.24);
}
.moon-phase--new{
  background:transparent;
  border:1px solid rgba(232,237,244,.34);
  box-shadow:none;
}
.moon-phase--crescent{box-shadow:inset -7px 0 0 0 var(--footer-bg),0 0 12px rgba(111,211,217,.2)}
.moon-phase--half{box-shadow:inset -9px 0 0 0 var(--footer-bg)}
.moon-phase--gibbous{box-shadow:inset 6px 0 0 0 var(--footer-bg)}
.moon-phase--full{box-shadow:0 0 16px rgba(139,123,216,.5)}

.footer-col{display:flex;flex-direction:column}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:400;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--gold);
}
.footer-list{display:grid;gap:9px}
.footer-list__item{min-width:0}
.footer-list__link{
  display:inline-block;
  font-size:14px;
  color:var(--dim);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-list__link:hover{color:var(--gold);border-bottom-color:rgba(216,169,74,.55)}

.footer-col--contact{min-width:0}
.contact-list{display:grid;gap:10px}
.contact-list__item{
  display:grid;
  grid-template-columns:40px minmax(0,1fr);
  gap:8px;
  align-items:baseline;
}
.contact-list__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--dimmer);
}
.contact-list__value{
  font-size:13.5px;
  line-height:1.6;
  color:var(--silver);
  word-break:break-word;
}
.footer-note{
  margin-top:14px;
  padding-left:12px;
  border-left:1px solid rgba(216,169,74,.45);
  font-size:12.5px;
  line-height:1.7;
  color:var(--dimmer);
}

.footer-legal{
  position:relative;
  border-top:1px solid var(--line);
  background:rgba(0,0,0,.26);
}
.footer-legal__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding-block:16px;
}
.footer-legal__copy{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--dimmer);
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal__link{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--dim);
  transition:color .18s var(--ease);
}
.footer-legal__link:hover{color:var(--gold)}

/* ---------- 页面标题区 ---------- */
.page-head{padding-block:clamp(26px,4vw,44px) clamp(18px,2.6vw,30px)}
.page-head__index{
  display:block;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.3em;
  color:var(--gold);
}
.page-head .display{max-width:17em}
.page-head__lede{margin-top:18px}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-top:18px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--dimmer);
}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__sep{color:rgba(232,237,244,.24)}
.breadcrumb__link{color:var(--dim);transition:color .18s var(--ease)}
.breadcrumb__link:hover{color:var(--gold)}
.breadcrumb__item[aria-current="page"]{color:var(--silver)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-title);
  font-weight:600;
  font-size:14.5px;
  letter-spacing:.08em;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn__arrow{font-family:var(--font-mono);font-size:12px;transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:#1B1206}
.btn--gold:hover{background:#E7BC61}
.btn--gold:active{transform:translateY(1px)}
.btn--ghost{border-color:rgba(232,237,244,.34);color:var(--silver)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold);background:var(--gold-soft)}
.btn--ghost:active{transform:translateY(1px)}

/* ---------- 目录 / 旁注 / 面板 ---------- */
.index-list{border-top:1px solid var(--line)}
.index-list__item{border-bottom:1px solid var(--line)}
.index-list__link{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:baseline;
  gap:14px;
  padding:17px 4px;
  color:var(--silver);
  transition:padding-left .22s var(--ease),color .2s var(--ease);
}
.index-list__link:hover{padding-left:14px;color:var(--gold)}
.index-list__num{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--gold);
}
.index-list__title{
  font-family:var(--font-title);
  font-weight:600;
  font-size:16.5px;
  letter-spacing:.03em;
}
.index-list__meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dimmer);
}
.section--paper .index-list,
.section--paper .index-list__item{border-color:rgba(44,36,29,.16)}
.section--paper .index-list__link{color:var(--ink)}
.section--paper .index-list__num{color:#9A6A32}
.section--paper .index-list__meta{color:rgba(44,36,29,.55)}

.note{
  padding:12px 0 12px 16px;
  border-left:2px solid var(--gold);
  font-size:13.5px;
  line-height:1.75;
  color:var(--dim);
}
.panel{
  background:var(--midnight);
  border:1px solid var(--line);
  border-radius:3px;
  padding:clamp(18px,2.6vw,28px);
}
.panel--paper{
  background:var(--paper);
  border-color:#E1D6C0;
  color:var(--ink);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--dim);
}
.divider{height:1px;border:0;background:var(--line);margin-block:clamp(26px,4vw,46px)}

/* ---------- 图像容器（页面阶段放图 / SVG） ---------- */
.media{margin:0;display:block}
.media__frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  border-radius:3px;
  background:linear-gradient(158deg,var(--midnight),#0A1930);
}
.media__frame img,
.media__frame svg{width:100%;height:100%;object-fit:cover}
.media__frame--tall{aspect-ratio:4/5}
.media__frame--square{aspect-ratio:1/1}
.media__frame--moon{
  background:
    radial-gradient(circle at 70% 32%, rgba(111,211,217,.32), transparent 58%),
    radial-gradient(circle at 28% 74%, rgba(139,123,216,.3), transparent 62%),
    var(--space);
}
.media__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dimmer);
}

/* ---------- 显现 ---------- */
.has-reveal [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .34s var(--ease),transform .34s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 70ms);
}
.has-reveal [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .main-nav__link{padding:13px 11px;font-size:13.5px}
  .footer-top{grid-template-columns:1.2fr 1fr 1fr}
  .footer-col--contact{grid-column:1 / -1}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-tools .disclose{display:none}

  .site-header .main-nav{display:none}
  .site-header[data-open] .main-nav{display:block;padding-block:6px 14px}
  .main-nav__list{flex-direction:column;gap:0}
  .main-nav__link{
    padding:13px 4px;
    border-bottom:1px solid rgba(42,59,82,.72);
    font-size:15px;
    white-space:normal;
  }
  .main-nav__link::after{display:none}
  .main-nav__link[aria-current="page"]{color:var(--gold)}
  .main-nav__link[aria-current="page"] .main-nav__num{color:var(--gold)}

  .layout-asym{gap:26px}
  .col-note{order:3}
}

@media (max-width:720px){
  .brand__name{font-size:17px}
  .brand__line{font-size:10px;letter-spacing:.1em}
  .footer-top{grid-template-columns:1fr 1fr;gap:28px 22px}
  .footer-brand{grid-column:1 / -1}
  .footer-col--contact{grid-column:1 / -1}
  .footer-legal__inner{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-legal__links{gap:14px}
}

@media (max-width:480px){
  .footer-top{grid-template-columns:1fr}
  .contact-list__item{grid-template-columns:44px minmax(0,1fr)}
  .btn{width:100%;justify-content:center}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-reveal [data-reveal]{opacity:1 !important;transform:none !important}
  .main-nav__link:hover::after{transform:scaleX(1)}
}