/* ============================================================
   银河主页 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 命令栏 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:72px;
}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0;padding:0}
ul,ol{list-style:none}
address{font-style:normal}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- 2. 变量 ---------- */
:root{
  /* 色板 */
  --void:#04050C;
  --deep:#0A1024;
  --panel:#121A33;
  --line:#26304F;
  --paper:#F4ECDC;
  --paper-dim:#DED6C4;
  --dust:#9BA6C4;
  --violet:#7C4DFF;
  --cyan:#3FD8D2;
  --gold:#FFB454;
  --amber:#C97A2B;

  /* 尺寸节奏 */
  --bar-h:48px;
  --bar-h-compact:40px;
  --u:8px;
  --r:4px;
  --shell:1180px;

  /* 字体 */
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  background-color:var(--void);
  background-image:
    linear-gradient(rgba(38,48,79,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(38,48,79,.42) 1px,transparent 1px),
    radial-gradient(900px 520px at 10% -10%,rgba(124,77,255,.24),transparent 62%),
    radial-gradient(760px 480px at 94% 2%,rgba(63,216,210,.14),transparent 60%),
    linear-gradient(180deg,#04050C 0%,#070C1A 48%,#04050C 100%);
  background-size:96px 96px,96px 96px,auto,auto,auto;
  background-position:0 0,0 0,center,center,center;
  background-repeat:repeat,repeat,no-repeat,no-repeat,no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{display:block;position:relative;z-index:1}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.2;letter-spacing:-.02em;color:var(--paper)}
strong,b{font-weight:700;color:var(--paper)}
::selection{background:rgba(124,77,255,.42);color:var(--paper)}

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

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* ---------- 4. 通用容器与节奏 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(16px,4vw,28px);
}
.section{padding-block:clamp(40px,6vw,80px)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 16px;margin-bottom:clamp(20px,3vw,32px)}
.section-title{font-size:clamp(24px,3.4vw,38px);letter-spacing:-.015em}
.eyebrow{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.26em;text-transform:uppercase;color:var(--cyan);
}
.mono{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--dust)}
.lead{font-size:17px;line-height:1.8;color:var(--dust);max-width:64ch}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:9px 16px;
  border:1px solid var(--line);border-radius:var(--r);
  background:rgba(18,26,51,.72);
  color:var(--paper);
  font-size:13.5px;font-weight:600;letter-spacing:.04em;white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{border-color:rgba(124,77,255,.75);background:rgba(124,77,255,.16)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--gold);border-color:var(--gold);color:#14100A}
.btn-primary:hover{background:var(--amber);border-color:var(--amber);color:#0B0906}
.btn-quiet{background:transparent;border-color:transparent;color:var(--dust)}
.btn-quiet:hover{color:var(--cyan);border-color:var(--line);background:rgba(63,216,210,.08)}

/* ---------- 6. 头部命令栏 ---------- */
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:120;
  padding:8px 14px;border-radius:var(--r);
  background:var(--gold);color:#14100A;font-size:13px;font-weight:700;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:10px}

.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,16,36,.88);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:box-shadow .2s var(--ease);
}
.site-header[data-scrolled="true"]{box-shadow:0 14px 34px -22px rgba(0,0,0,.95)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,rgba(38,48,79,.7),rgba(38,48,79,0));
  overflow:hidden;
}
.scroll-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--violet),var(--cyan) 55%,var(--gold));
  transition:transform .12s linear;
}

.command-bar{
  display:flex;align-items:center;gap:clamp(10px,2vw,24px);
  height:var(--bar-h);
  transition:height .2s var(--ease);
}
.site-header[data-scrolled="true"] .command-bar{height:var(--bar-h-compact)}

/* 署名 */
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;min-width:0}
.brand-mark{
  position:relative;flex:0 0 auto;
  width:18px;height:18px;border-radius:50%;
  border:1px solid var(--line);
}
.brand-mark::before{
  content:"";position:absolute;inset:3px;border-radius:50%;
  border:1px solid var(--cyan);
  border-right-color:transparent;border-bottom-color:transparent;
  transform:rotate(-34deg);
}
.brand-mark::after{
  content:"";position:absolute;inset:7px;border-radius:50%;
  background:var(--gold);box-shadow:0 0 8px rgba(255,180,84,.7);
}
.brand-text{display:flex;flex-direction:column;line-height:1.06;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-size:16px;font-weight:700;letter-spacing:.08em;color:var(--paper);
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9px;letter-spacing:.34em;text-transform:uppercase;color:var(--dust);
  white-space:nowrap;
}

/* 导航 */
.primary-nav{margin-inline:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 11px;border-radius:var(--r);
  color:var(--dust);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-index{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;
  color:var(--dust);opacity:.6;
  transition:color .18s var(--ease),opacity .18s var(--ease);
}
.nav-label{font-size:14px;font-weight:500;letter-spacing:.02em}
.nav-link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:2px;height:1px;
  background:var(--gold);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(124,77,255,.14)}
.nav-link:hover .nav-index{color:var(--cyan);opacity:1}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"] .nav-label{font-weight:700}
.nav-link[aria-current="page"] .nav-index{color:var(--gold);opacity:1}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 动作区 */
.bar-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--line);border-radius:var(--r);
  background:rgba(18,26,51,.72);color:var(--paper);
  font-size:13px;font-weight:600;letter-spacing:.06em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--violet);color:var(--cyan)}
.nav-toggle-icon{position:relative;width:16px;height:10px;flex:0 0 auto}
.nav-toggle-icon::before,
.nav-toggle-icon::after{
  content:"";position:absolute;left:0;right:0;height:1px;background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-icon::before{top:1px}
.nav-toggle-icon::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{top:5px;transform:rotate(-45deg)}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:linear-gradient(180deg,rgba(10,16,36,.55),var(--deep) 60%,#070B18);
  border-top:1px solid var(--line);
  color:var(--dust);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:clamp(24px,4vw,48px);
  padding-block:clamp(40px,6vw,64px) clamp(26px,4vw,40px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px;min-width:0}
.footer-tagline{
  font-size:15px;line-height:1.7;letter-spacing:.02em;color:var(--paper);max-width:26em;
}
.footer-note{font-size:13px;line-height:1.75;color:var(--dust);max-width:30em}
.footer-col{min-width:0}
.footer-title{
  display:flex;align-items:center;
  font-family:var(--font-display);
  font-size:13px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--paper);margin-bottom:14px;
}
.footer-title::before{
  content:"";display:inline-block;width:14px;height:1px;margin-right:9px;
  background:var(--gold);flex:0 0 auto;
}
.footer-list li+li{margin-top:9px}
.footer-list a{
  display:inline-block;font-size:14px;color:var(--dust);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer-list a:hover{color:var(--cyan);transform:translateX(2px)}
.footer-address{display:grid;gap:3px;font-size:13.5px;margin-bottom:12px}
.footer-meta{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--cyan);
}
.footer-value{color:var(--paper);font-size:14px;line-height:1.6;word-break:break-word}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;
  justify-content:space-between;
  padding-block:16px;
  border-top:1px solid rgba(38,48,79,.75);
}
.footer-copy{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--dust);
}
.footer-legal-list{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13px}
.footer-legal-list a{color:var(--dust);transition:color .16s var(--ease)}
.footer-legal-list a:hover{color:var(--cyan)}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 11px;border:1px solid var(--line);border-radius:var(--r);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--dust);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.to-top::before{
  content:"";width:0;height:0;
  border-left:4px solid transparent;border-right:4px solid transparent;
  border-bottom:5px solid currentColor;
}
.to-top:hover{color:var(--gold);border-color:rgba(255,180,84,.6)}
.footer-rule{
  height:20px;
  background-image:
    repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 32px),
    linear-gradient(90deg,transparent,rgba(38,48,79,.9),transparent);
  background-size:100% 6px,100% 1px;
  background-position:0 0,0 8px;
  background-repeat:no-repeat,no-repeat;
  opacity:.9;
}

/* ---------- 8. 基础组件 ---------- */
/* 面包屑 */
.breadcrumb{padding-top:clamp(16px,2.5vw,26px)}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;gap:6px 10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--dust);
}
.breadcrumb-list li{display:flex;align-items:center;gap:10px}
.breadcrumb-list li+li::before{content:"/";color:var(--line)}
.breadcrumb-list a{color:var(--dust);transition:color .16s var(--ease)}
.breadcrumb-list a:hover{color:var(--cyan)}
.breadcrumb-list [aria-current="page"]{color:var(--paper)}

/* 控制台面板 */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(18,26,51,.94),rgba(10,16,36,.94));
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:inset 0 1px 0 rgba(244,236,220,.04),0 20px 44px -34px rgba(0,0,0,.95);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.panel:hover{
  border-color:rgba(124,77,255,.7);
  transform:translateY(-2px);
  box-shadow:inset 0 1px 0 rgba(244,236,220,.06),0 24px 48px -32px rgba(124,77,255,.35);
}
.panel-body{padding:clamp(18px,2.4vw,26px)}
.panel-title{font-family:var(--font-display);font-size:19px;font-weight:700;letter-spacing:.01em;color:var(--paper)}
.panel-meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--dust);
}
.panel-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--u)}
.panel-grid>*{grid-column:span 12;min-width:0}

/* 标签 */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);border-radius:999px;
  background:rgba(18,26,51,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--dust);
}
.tag--cyan{color:var(--cyan);border-color:rgba(63,216,210,.42)}
.tag--gold{color:var(--gold);border-color:rgba(255,180,84,.42)}

/* 长文 */
.prose{max-width:72ch;font-size:16.5px;line-height:1.78;color:var(--paper-dim)}
.prose>*+*{margin-top:1.2em}
.prose h2{font-size:clamp(20px,2.6vw,26px);letter-spacing:-.01em;color:var(--paper)}
.prose h3{font-size:17px;font-weight:700;letter-spacing:.01em;color:var(--paper)}
.prose ul,.prose ol{padding-left:1.25em}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.45em}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--gold)}
.prose blockquote{
  padding:12px 18px;border-left:2px solid var(--violet);
  background:rgba(124,77,255,.08);color:var(--dust);
}

/* 图片容器基础规则 */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r);
  aspect-ratio:16/9;
  background-color:var(--void);
  background-image:
    radial-gradient(120% 90% at 16% 8%,rgba(124,77,255,.34),transparent 60%),
    radial-gradient(90% 80% at 88% 80%,rgba(63,216,210,.2),transparent 62%),
    linear-gradient(160deg,#0A1024,#04050C 72%);
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(38,48,79,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(38,48,79,.5) 1px,transparent 1px);
  background-size:56px 56px;
  opacity:.55;
}
.media-frame img,
.media-frame picture{
  position:relative;z-index:1;width:100%;height:100%;object-fit:cover;
}
.media-frame figcaption{
  position:relative;z-index:2;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--dust);
  border-top:1px solid var(--line);background:rgba(4,5,12,.72);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}

/* 渐进显现 */
html.has-js [data-reveal]{
  opacity:0;transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 9. 响应式 ---------- */
@media (min-width:720px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-6{grid-column:span 6}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
}

@media (max-width:980px){
  :root{--bar-h:46px;--bar-h-compact:44px}
  .nav-toggle{display:inline-flex}
  .btn-quiet{display:none}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    margin-inline:0;
    padding:8px clamp(16px,4vw,28px) 18px;
    background:rgba(7,11,24,.985);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 50px -30px rgba(0,0,0,1);
    visibility:hidden;opacity:0;transform:translateY(-8px);pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
    max-height:calc(100vh - var(--bar-h));
    overflow-y:auto;
  }
  .primary-nav[data-open="true"]{visibility:visible;opacity:1;transform:none;pointer-events:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    justify-content:flex-start;
    padding:13px 6px;
    border-bottom:1px solid rgba(38,48,79,.65);
    border-radius:0;
  }
  .nav-link:last-child{border-bottom:0}
  .nav-link::after{left:6px;right:auto;width:20px;bottom:8px}
  .nav-index{width:24px;flex:0 0 auto;font-size:11px}
  .nav-label{font-size:16px}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:600px){
  body{font-size:15.5px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .footer-legal{justify-content:flex-start}
  .media-frame{aspect-ratio:3/2}
  .media-frame--wide{aspect-ratio:16/9}
}

@media (max-width:520px){
  .brand-sub{display:none}
  .btn{padding:8px 12px;font-size:12.5px}
  .nav-toggle{padding:8px 10px}
  .nav-toggle-text{display:none}
}

/* ---------- 10. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
}