/* ==========================================================================
   银河主页 · 共享外壳样式 /assets/site.css
   夜蓝底 · 暖琥珀灯带 · 奶油纸长读
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#0B1026;
  --ink-2:#151C3D;
  --ink-3:#1E2750;
  --paper:#F4E9D8;
  --paper-2:#EADCC6;
  --amber:#F2A65A;
  --amber-soft:#FFD9A0;
  --silver:#C9D1E3;
  --silver-dim:#8E9AB8;
  --jade:#6FAF9E;
  --rust:#D9663D;
  --brown:#2A1D18;
  --mist:#F7F2E8;

  --line:rgba(201,209,227,.20);
  --line-strong:rgba(201,209,227,.44);
  --line-paper:rgba(42,29,24,.16);

  --font-display:"Noto Serif SC","Songti SC",STSong,"SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  --step-display:clamp(2.6rem,6vw,4.5rem);
  --step-h1:clamp(1.9rem,4.2vw,2.75rem);
  --step-h2:clamp(1.35rem,2.6vw,1.75rem);
  --step-body:1.0625rem;
  --step-note:.875rem;
  --step-mono:.74rem;

  --gutter:clamp(20px,4vw,72px);
  --maxw:1240px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
}

/* ---------- 2. Reset 与基础 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:var(--step-body);
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video,picture{display:block;max-width:100%;height:auto;}
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.24;
  letter-spacing:-.01em;
  text-wrap:balance;
}
p{margin:0 0 1.1em;}
ul,ol{margin:0;padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;}
[hidden]{display:none !important;}
[id]{scroll-margin-top:clamp(84px,14vh,120px);}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--amber-soft);
  outline-offset:3px;
  border-radius:6px;
  box-shadow:0 0 0 5px rgba(11,16,38,.85);
}
.surface-paper :where(a,button,summary,[tabindex]):focus-visible{
  outline-color:var(--rust);
  box-shadow:0 0 0 5px rgba(244,233,216,.9);
}

/* ---------- 3. 版面容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,6.5vw,96px);}
.section--tight{padding-block:clamp(22px,3.4vw,44px);}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-9{grid-column:span 9;}
.col-12{grid-column:span 12;}

.rule{
  height:1px;
  border:0;
  margin:clamp(24px,4vw,44px) 0;
  background:linear-gradient(90deg,var(--line-strong),var(--line) 55%,rgba(201,209,227,0));
}

/* ---------- 4. 文本组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.65em;
  margin:0 0 .95em;
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  letter-spacing:.24em;
  color:var(--amber);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
  opacity:.85;
}
.surface-paper .eyebrow{color:#9C4423;}

.lead{
  max-width:58ch;
  font-size:clamp(1.02rem,1.6vw,1.25rem);
  line-height:1.78;
  color:var(--silver);
}
.surface-paper .lead{color:#4A382F;}

.prose{
  max-width:70ch;
  font-size:var(--step-body);
  line-height:1.85;
  letter-spacing:.012em;
  color:inherit;
}
.prose > * + *{margin-top:1.15em;}
.prose p{margin:0;}
.prose h2{font-size:var(--step-h2);margin-top:1.9em;}
.prose h3{font-size:1.12rem;margin-top:1.6em;letter-spacing:.01em;}
.prose ul,.prose ol{padding-left:1.35em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li + li{margin-top:.42em;}
.prose blockquote{
  margin:1.6em 0;
  padding:.2em 0 .2em 1.1em;
  border-left:2px solid var(--amber);
  font-family:var(--font-display);
  font-size:1.1rem;
  line-height:1.8;
}
.prose a{
  border-bottom:1px solid var(--amber);
  padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.prose a:hover{color:var(--amber-soft);border-color:var(--amber-soft);}
.surface-paper .prose a{color:#8A3E1E;border-color:var(--rust);}
.surface-paper .prose a:hover{color:var(--rust);border-color:var(--brown);}

.surface-paper{
  background:var(--paper);
  color:var(--brown);
  border-radius:var(--radius-lg);
  padding:clamp(22px,3.4vw,52px);
  box-shadow:0 30px 60px -46px rgba(0,0,0,.9);
}

.breadcrumb{
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  letter-spacing:.1em;
  color:var(--silver-dim);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:.5em;align-items:center;}
.breadcrumb__list li{display:inline-flex;align-items:center;gap:.5em;}
.breadcrumb__list li::after{content:"/";color:rgba(201,209,227,.36);}
.breadcrumb__list li:last-child::after{content:"";}
.breadcrumb a{
  color:var(--silver);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.breadcrumb a:hover{color:var(--amber-soft);border-color:var(--amber);}

/* ---------- 5. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55em;
  padding:.82em 1.55em;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-size:.94rem;
  font-weight:600;
  letter-spacing:.05em;
  line-height:1.2;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn--amber{
  background:var(--amber);
  color:#26160A;
  box-shadow:0 14px 30px -18px rgba(242,166,90,.95);
}
.btn--amber:hover{background:var(--amber-soft);transform:translateY(-1px);}
.btn--ghost{
  background:rgba(21,28,61,.5);
  border-color:var(--line-strong);
  color:var(--mist);
}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber-soft);background:rgba(30,39,80,.75);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.45em;
  padding:.32em .82em;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  color:var(--silver);
  white-space:nowrap;
}
.tag--amber{background:var(--amber);border-color:transparent;color:#26160A;}
.tag--jade{background:var(--jade);border-color:transparent;color:#06121C;}

.status-dot{
  display:inline-block;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--jade);
  box-shadow:0 0 0 3px rgba(111,175,158,.18);
  vertical-align:middle;
}
.status-dot--amber{background:var(--amber);box-shadow:0 0 0 3px rgba(242,166,90,.18);}

/* ---------- 6. 光斑卡与注释块 ---------- */
.glow-card{
  position:relative;
  display:block;
  overflow:hidden;
  padding:clamp(20px,3vw,34px);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:var(--ink-2);
  color:var(--mist);
  transition:border-color .24s ease,background .24s ease,transform .24s ease;
}
.glow-card::before{
  content:"";
  position:absolute;
  left:-15%;
  right:-15%;
  top:-70px;
  height:190px;
  background:radial-gradient(closest-side,rgba(242,166,90,.34),rgba(242,166,90,0) 72%);
  opacity:.45;
  transform:translateY(-14px);
  transition:opacity .32s ease,transform .32s ease;
  pointer-events:none;
}
.glow-card:hover,.glow-card:focus-visible{
  border-color:rgba(242,166,90,.6);
  background:var(--ink-3);
  transform:translateY(-2px);
}
.glow-card:hover::before,.glow-card:focus-visible::before{opacity:1;transform:translateY(0);}

.note-card{
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line);
  border-left:2px solid var(--amber);
  border-radius:var(--radius-md);
  background:var(--ink-2);
  color:var(--silver);
  font-size:.94rem;
  line-height:1.78;
}
.note-card strong{color:var(--mist);font-weight:600;}

/* ---------- 7. 图片位基础规则 ---------- */
.figure{margin:0;display:block;}
.figure__media{
  position:relative;
  width:100%;
  aspect-ratio:4 / 3;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  background:
    radial-gradient(120% 130% at 28% 18%,#232F5E,rgba(11,16,38,0) 62%),
    radial-gradient(80% 90% at 78% 88%,rgba(242,166,90,.22),rgba(11,16,38,0) 70%),
    var(--ink-2);
}
.figure__media img,.figure__media picture,.figure__media svg,.figure__media video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(11,16,38,0) 48%,rgba(11,16,38,.55));
  pointer-events:none;
}
.figure__caption{
  margin-top:.72em;
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  letter-spacing:.08em;
  color:var(--silver-dim);
}
.figure--wide .figure__media{aspect-ratio:16 / 9;}
.figure--tall .figure__media{aspect-ratio:3 / 4;}

/* ---------- 8. 页头 ---------- */
.skip-link{
  position:absolute;
  left:50%;
  top:0;
  z-index:200;
  transform:translate(-50%,-130%);
  padding:.72em 1.3em;
  border-radius:0 0 var(--radius-md) var(--radius-md);
  background:var(--amber-soft);
  color:#1A0F05;
  font-weight:600;
  font-size:.9rem;
  letter-spacing:.06em;
  transition:transform .18s ease;
}
.skip-link:focus-visible,.skip-link:focus{transform:translate(-50%,0);}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--mist);
  background:
    radial-gradient(90% 190% at 50% -85%,rgba(242,166,90,.20),rgba(11,16,38,0) 62%),
    var(--ink);
  border-bottom:1px solid var(--line);
}
.site-header__inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:clamp(10px,2vw,24px);
  padding-block:clamp(10px,1.6vw,16px);
  border-bottom:1px solid var(--line);
}
.masthead__note{
  margin:0;
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  letter-spacing:.2em;
  color:var(--silver-dim);
}
.brand{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  justify-self:center;
  color:var(--mist);
  text-align:center;
}
.brand__lamp{
  width:clamp(46px,7vw,74px);
  height:3px;
  border-radius:var(--radius-pill);
  background:linear-gradient(90deg,rgba(242,166,90,0),var(--amber-soft) 50%,rgba(242,166,90,0));
  box-shadow:0 0 16px 1px rgba(242,166,90,.55);
}
.brand__name{
  font-family:var(--font-display);
  font-size:clamp(1.2rem,2.1vw,1.58rem);
  font-weight:600;
  line-height:1.1;
  letter-spacing:.34em;
  padding-left:.34em;
  transition:color .2s ease;
}
.brand:hover .brand__name,.brand:focus-visible .brand__name{color:var(--amber-soft);}
.brand__tagline{
  font-size:.7rem;
  letter-spacing:.22em;
  padding-left:.22em;
  color:var(--silver-dim);
}

.masthead__actions{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.5vw,18px);
  justify-self:end;
}
.utility-nav{display:flex;align-items:center;gap:clamp(10px,1.6vw,20px);}
.utility-link{
  font-size:.82rem;
  letter-spacing:.08em;
  color:var(--silver);
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.utility-link:hover,.utility-link:focus-visible{color:var(--amber-soft);border-color:var(--amber);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55em;
  padding:.55em 1em;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-pill);
  background:rgba(242,166,90,.10);
  color:var(--mist);
  font-size:.84rem;
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--amber);color:var(--amber-soft);}
.nav-toggle__label{font-size:.8rem;letter-spacing:.16em;}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:3px;width:16px;}
.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s ease,opacity .22s ease;
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

.lamp-nav{display:block;}
.lamp-nav__list{
  display:flex;
  justify-content:center;
  align-items:stretch;
  gap:clamp(2px,1.6vw,26px);
}
.lamp-nav__item{display:flex;}
.lamp-nav__link{
  position:relative;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:7px;
  padding:10px clamp(8px,1.2vw,15px) 13px;
  color:var(--silver);
  font-size:.92rem;
  letter-spacing:.08em;
  transition:color .18s ease;
}
.lamp-nav__dot{
  width:5px;
  height:5px;
  border-radius:50%;
  background:rgba(201,209,227,.45);
  transition:background .18s ease,box-shadow .18s ease,transform .18s ease;
}
.lamp-nav__text{line-height:1.2;}
.lamp-nav__link::after{
  content:"";
  position:absolute;
  left:8%;
  right:8%;
  bottom:0;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,rgba(242,166,90,0),var(--amber),rgba(242,166,90,0));
  opacity:0;
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .24s ease,opacity .24s ease;
}
.lamp-nav__link:hover,.lamp-nav__link:focus-visible{color:var(--mist);}
.lamp-nav__link:hover .lamp-nav__dot,.lamp-nav__link:focus-visible .lamp-nav__dot{
  background:var(--amber-soft);
  box-shadow:0 0 10px rgba(255,217,160,.9);
}
.lamp-nav__link:hover::after,.lamp-nav__link:focus-visible::after{transform:scaleX(1);opacity:.55;}
.lamp-nav__link[aria-current="page"]{color:var(--amber-soft);}
.lamp-nav__link[aria-current="page"] .lamp-nav__dot{
  background:var(--amber);
  box-shadow:0 0 12px 1px rgba(242,166,90,.85);
  transform:scale(1.25);
}
.lamp-nav__link[aria-current="page"]::after{transform:scaleX(1);opacity:1;}

.read-progress{
  width:100%;
  height:2px;
  background:rgba(201,209,227,.10);
  overflow:hidden;
}
.read-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--rust),var(--amber) 46%,var(--amber-soft));
  box-shadow:0 0 12px rgba(242,166,90,.7);
  transition:width .1s linear;
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position:relative;
  padding:clamp(40px,6vw,76px) var(--gutter) clamp(24px,3vw,34px);
  background:linear-gradient(180deg,var(--ink) 0%,#080C1E 100%);
  border-top:1px solid var(--line);
  color:var(--silver);
}
.site-footer__inner{width:100%;max-width:var(--maxw);margin-inline:auto;}

.footer-lamp{
  position:relative;
  height:1px;
  margin-bottom:clamp(26px,4vw,48px);
  background:linear-gradient(90deg,rgba(242,166,90,0),rgba(242,166,90,.6) 16%,rgba(201,209,227,.22) 62%,rgba(242,166,90,0));
}
.footer-lamp__node{
  position:absolute;
  top:-2px;
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 10px 1px rgba(242,166,90,.8);
}
.footer-lamp__node:nth-child(1){left:0;}
.footer-lamp__node:nth-child(2){left:33.333%;background:var(--silver);box-shadow:none;opacity:.6;}
.footer-lamp__node:nth-child(3){left:66.666%;background:var(--silver);box-shadow:none;opacity:.6;}
.footer-lamp__node:nth-child(4){right:0;}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.6fr;
  gap:clamp(24px,4vw,60px);
  align-items:start;
}
.footer-brand__link{
  display:inline-block;
  font-family:var(--font-display);
  font-size:clamp(1.15rem,2vw,1.42rem);
  letter-spacing:.3em;
  color:var(--mist);
  transition:color .2s ease;
}
.footer-brand__link:hover,.footer-brand__link:focus-visible{color:var(--amber-soft);}
.footer-brand__line{
  margin:.85em 0 .55em;
  font-family:var(--font-display);
  font-size:1rem;
  letter-spacing:.06em;
  color:var(--amber-soft);
}
.footer-brand__note{
  margin:0;
  max-width:32ch;
  font-size:.86rem;
  line-height:1.75;
  color:var(--silver-dim);
}

.footer-heading{
  margin:0 0 1.1em;
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  font-weight:500;
  letter-spacing:.24em;
  color:var(--amber);
}
.footer-nav__list li + li{margin-top:.55em;}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:.92rem;
  color:var(--silver);
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-link::before{
  content:"";
  display:inline-block;
  width:4px;
  height:4px;
  margin-right:.6em;
  border-radius:50%;
  background:rgba(201,209,227,.4);
  vertical-align:middle;
  transition:background .18s ease,box-shadow .18s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--amber-soft);border-color:var(--amber);}
.footer-link:hover::before,.footer-link:focus-visible::before{
  background:var(--amber);
  box-shadow:0 0 8px rgba(242,166,90,.9);
}

.footer-contact__list{display:grid;gap:.62em;}
.footer-contact__item{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:.9em;
  align-items:baseline;
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  color:var(--silver-dim);
  white-space:nowrap;
}
.footer-contact__value{
  font-size:.86rem;
  line-height:1.68;
  color:var(--silver);
  word-break:break-word;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(28px,4vw,50px);
  padding-top:18px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:var(--step-mono);
  letter-spacing:.1em;
  color:var(--silver-dim);
}
.footer-legal,.footer-copy{margin:0;}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,30px);
  bottom:clamp(14px,3vw,30px);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.7em 1.1em;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-pill);
  background:rgba(21,28,61,.94);
  color:var(--mist);
  font-size:.78rem;
  letter-spacing:.14em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .24s ease,transform .24s ease,visibility .24s,border-color .18s ease,color .18s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover,.to-top:focus-visible{border-color:var(--amber);color:var(--amber-soft);}
.to-top__arrow{color:var(--amber);font-size:.9rem;line-height:1;}

/* ---------- 10. 响应式 ---------- */
@media (max-width:900px){
  .nav-toggle{display:inline-flex;}
  .utility-nav{display:none;}
  .masthead{
    grid-template-columns:1fr auto;
    padding-block:12px;
  }
  .masthead__note{display:none;}
  .brand{justify-self:start;align-items:flex-start;text-align:left;}
  .masthead__actions{justify-self:end;}

  .lamp-nav{display:none;}
  .site-header[data-open] .lamp-nav{display:block;}
  .lamp-nav__list{
    flex-direction:column;
    gap:0;
    padding:6px 0 14px;
  }
  .lamp-nav__item{border-bottom:1px solid var(--line);}
  .lamp-nav__item:last-child{border-bottom:0;}
  .lamp-nav__link{
    width:100%;
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:12px;
    padding:14px 4px;
    font-size:1rem;
  }
  .lamp-nav__link::after{display:none;}
  .lamp-nav__dot{width:6px;height:6px;}

  .grid-12 > [class*="col-"]{grid-column:span 12;}
}

@media (max-width:900px) and (min-width:601px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}

@media (max-width:620px){
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .brand__tagline{font-size:.66rem;letter-spacing:.16em;}
  .surface-paper{border-radius:var(--radius-md);}
}

/* ---------- 11. 动效与可访问性 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .glow-card:hover,.glow-card:focus-visible,.btn--amber:hover{transform:none;}
  .to-top{transform:none;}
  .to-top[data-visible]{transform:none;}
}