/* ==========================================================================
   巨星中心 · /assets/site.css
   共享外壳：左侧版本轨道页头、档案式页脚、通用排版与基础组件
   ========================================================================== */

/* 1. 变量 ------------------------------------------------------------------ */
:root{
  --deep:#071426;
  --midnight:#0B1F35;
  --panel:#123252;
  --cool:#8C99A6;
  --cyan:#22E6D2;
  --orange:#FF7A3C;
  --warm:#F5F2EA;
  --mist:#6FB7C8;
  --line:#2B4C6F;
  --glow:#1B4566;

  --rail-w:264px;
  --shell-max:1180px;
  --gutter:20px;

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --font-body:var(--font-display);
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --dur:.18s;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* 2. Reset ---------------------------------------------------------------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  color:var(--warm);
  background-color:var(--deep);
  background-image:
    linear-gradient(to right, rgba(43,76,111,.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43,76,111,.12) 1px, transparent 1px);
  background-size:76px 76px;
  background-position:-1px -1px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
strong,b{font-weight:700}

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

::selection{
  background:rgba(34,230,210,.28);
  color:var(--warm);
}

/* 3. 通用排版与容器 ------------------------------------------------------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:52px}

.section-head{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-bottom:30px;
  max-width:70ch;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  line-height:1.4;
  color:var(--cyan);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--cyan);
  flex:0 0 18px;
}

.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3.4vw,34px);
  font-weight:700;
  line-height:1.24;
  letter-spacing:-.012em;
  color:var(--warm);
}

.lede{
  font-size:clamp(16px,1.4vw,18px);
  line-height:1.8;
  color:rgba(245,242,234,.82);
  max-width:64ch;
}

.body-text{
  font-size:16px;
  line-height:1.8;
  color:rgba(245,242,234,.88);
  max-width:70ch;
}
.body-text + .body-text{margin-top:1em}

.rule{
  height:1px;
  border:0;
  background:var(--line);
  margin:0;
}

.visually-hidden{
  position:absolute !important;
  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. 网格 ----------------------------------------------------------------- */
.grid{
  display:grid;
  gap:22px;
  grid-template-columns:1fr;
}

.grid--2{gap:24px}
.grid--3{gap:22px}

/* 5. 面板与标签 ----------------------------------------------------------- */
.panel{
  background:var(--panel);
  border:1px solid var(--line);
  padding:22px;
}
.panel--flat{
  background:rgba(18,50,82,.45);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.6;
  color:var(--cool);
  border:1px solid var(--line);
  white-space:nowrap;
}
.tag--new{
  color:var(--cyan);
  border-color:rgba(34,230,210,.45);
  background:rgba(34,230,210,.09);
}
.tag--old{
  color:var(--cool);
  border-color:rgba(140,153,166,.35);
  background:rgba(140,153,166,.08);
}
.tag--current{
  color:var(--orange);
  border-color:rgba(255,122,60,.5);
  background:rgba(255,122,60,.1);
}

/* 6. 按钮 ----------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  font-size:15px;
  font-weight:600;
  line-height:1.3;
  border:1px solid transparent;
  transition:background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             transform var(--dur) var(--ease);
}
.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:var(--deep);
}
.btn--primary:hover{
  background:#FF9366;
  border-color:#FF9366;
  transform:translateY(-1px);
}
.btn--ghost{
  border-color:var(--mist);
  color:var(--mist);
  background:transparent;
}
.btn--ghost:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  background:rgba(34,230,210,.08);
}

/* 7. 面包屑 --------------------------------------------------------------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  color:var(--cool);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
}
.breadcrumbs li{
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.breadcrumbs li + li::before{
  content:"/";
  color:var(--line);
}
.breadcrumbs a{color:var(--mist)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--warm)}

/* 8. 图片容器 ------------------------------------------------------------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  background:var(--panel);
  border:1px solid var(--line);
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > svg{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--fold{aspect-ratio:4 / 3}
.media-frame--portrait{aspect-ratio:3 / 4}

.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.7;
  letter-spacing:.02em;
  color:var(--cool);
}

/* 9. 页头：左侧版本轨道 / 移动浮岛 ---------------------------------------- */
.site-header{
  --p:0;
  position:sticky;
  top:0;
  z-index:60;
  padding:12px var(--gutter) 14px;
  background:var(--midnight);
  border-bottom:1px solid var(--line);
}

.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:120;
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  line-height:1.3;
  color:var(--deep);
  background:var(--cyan);
  border-radius:2px;
  transform:translateY(-220%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

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

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-width:0;
}

.brand-mark{
  position:relative;
  flex:0 0 30px;
  width:30px;
  height:30px;
  display:grid;
  place-items:center;
  border:1px solid var(--cyan);
  background:rgba(34,230,210,.08);
}
.brand-mark::before{
  content:"";
  width:10px;
  height:10px;
  background:var(--cyan);
  transition:background-color var(--dur) var(--ease);
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:-3px;
  bottom:-3px;
  width:6px;
  height:6px;
  background:var(--orange);
}
.brand:hover .brand-mark::before{background:var(--warm)}

.brand-stack{
  display:flex;
  flex-direction:column;
  gap:1px;
  min-width:0;
}
.brand-name{
  font-size:17px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.06em;
  color:var(--warm);
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.3;
  letter-spacing:.03em;
  color:var(--mist);
  white-space:nowrap;
}
.header-bar .brand-sub{display:none}

.header-bar .brand{
  flex:1 1 auto;
  min-width:0;
}

.rail-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  flex:0 0 auto;
  padding:3px 8px;
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.6;
  letter-spacing:.02em;
  color:var(--cyan);
  border:1px solid rgba(34,230,210,.38);
  background:rgba(34,230,210,.07);
  white-space:nowrap;
}
.rail-badge__dot{
  flex:0 0 5px;
  width:5px;
  height:5px;
  background:var(--orange);
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  padding:8px 12px;
  font-size:13px;
  font-weight:600;
  line-height:1.3;
  color:var(--warm);
  border:1px solid var(--line);
  background:rgba(18,50,82,.7);
  transition:border-color var(--dur) var(--ease),
             background-color var(--dur) var(--ease),
             color var(--dur) var(--ease);
}
.nav-toggle:hover{
  border-color:var(--cyan);
  color:var(--cyan);
}
.nav-toggle__bars{
  display:grid;
  gap:3px;
  width:16px;
}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__text{
  font-size:13px;
  letter-spacing:.06em;
  line-height:1.3;
}
.nav-toggle[aria-expanded="true"]{
  border-color:var(--cyan);
  color:var(--cyan);
  background:rgba(34,230,210,.1);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){
  transform:translateY(4.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){
  opacity:0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){
  transform:translateY(-4.5px) rotate(-45deg);
}

.nav-capsule{
  position:absolute;
  left:var(--gutter);
  right:var(--gutter);
  top:calc(100% + 10px);
  display:none;
  padding:10px;
  background:rgba(9,26,46,.97);
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:0 24px 48px rgba(0,0,0,.5);
  max-height:calc(100vh - 110px);
  overflow-y:auto;
}
.site-header[data-open] .nav-capsule{display:block}

.nav-list{
  display:grid;
  gap:2px;
}

.nav-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:12px 14px;
  font-size:15px;
  line-height:1.3;
  color:var(--mist);
  border:1px solid transparent;
  transition:color var(--dur) var(--ease),
             background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             transform var(--dur) var(--ease);
}
.nav-link::before{
  content:"";
  flex:0 0 3px;
  width:3px;
  height:14px;
  background:transparent;
  transition:background-color var(--dur) var(--ease);
}
.nav-link:hover{
  color:var(--warm);
  background:var(--glow);
  border-color:var(--line);
  transform:translateX(2px);
}
.nav-link[aria-current="page"]{
  color:var(--warm);
  background:rgba(34,230,210,.1);
  border-color:rgba(34,230,210,.35);
}
.nav-link[aria-current="page"]::before{background:var(--cyan)}

.nav-cta{
  display:flex;
  align-items:center;
  justify-content:center;
  margin-top:10px;
  padding:12px 16px;
  font-size:14px;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.03em;
  color:var(--deep);
  background:var(--orange);
  border:1px solid var(--orange);
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-cta:hover{
  background:#FF9366;
  border-color:#FF9366;
}

.rail-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(43,76,111,.6);
  pointer-events:none;
}
.rail-meter__fill{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--mist) 55%,var(--orange) 100%);
  transform:scaleX(var(--p,0));
  transform-origin:left center;
}

/* 10. 页脚 ---------------------------------------------------------------- */
.site-footer{
  position:relative;
  margin-top:0;
  padding:54px 0 26px;
  background:var(--midnight);
  border-top:1px solid var(--line);
  color:var(--cool);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0%,rgba(111,183,200,.25) 42%,var(--orange) 100%);
  opacity:.55;
}

.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:34px 28px;
}

.footer-brand{max-width:40ch}
.footer-brand .brand{margin-bottom:14px}
.footer-brand .brand-sub{display:block}

.footer-note{
  font-size:14px;
  line-height:1.85;
  color:var(--cool);
}

.footer-col{min-width:0}

.footer-title{
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  line-height:1.6;
  letter-spacing:.2em;
  color:var(--mist);
  border-bottom:1px solid var(--line);
}

.footer-list{
  display:grid;
  gap:9px;
  margin-top:16px;
}
.footer-list a{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:14.5px;
  line-height:1.6;
  color:var(--cool);
  transition:color var(--dur) var(--ease);
}
.footer-list a::before{
  content:"";
  flex:0 0 10px;
  width:10px;
  height:1px;
  background:var(--line);
  transition:background-color var(--dur) var(--ease);
}
.footer-list a:hover{color:var(--warm)}
.footer-list a:hover::before{background:var(--cyan)}

.footer-meta{
  display:grid;
  gap:6px;
  margin-top:40px;
  padding-top:22px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.9;
  letter-spacing:.01em;
  color:var(--cool);
  word-break:break-word;
}

/* 11. 正文锚点 ------------------------------------------------------------ */
#main-content{
  display:block;
  min-height:50vh;
}
#main-content:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:-4px;
}

/* 12. 断点 ---------------------------------------------------------------- */
@media (min-width:640px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:768px){
  :root{--gutter:32px}
  .section{padding-block:64px}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1.35fr 1fr 1fr}
}

@media (min-width:1024px){
  :root{--gutter:48px}

  body{padding-left:var(--rail-w)}

  .site-header{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:var(--rail-w);
    padding:30px 0 26px;
    border-bottom:0;
    border-right:1px solid var(--line);
    display:flex;
    flex-direction:column;
    background:linear-gradient(180deg,#0B1F35 0%,#091A2E 62%,#071426 100%);
  }

  .header-bar{
    flex-direction:column;
    align-items:flex-start;
    flex-wrap:nowrap;
    gap:14px;
    padding:0 22px;
  }
  .header-bar .brand{flex:0 0 auto}
  .header-bar .brand-sub{display:block}
  .nav-toggle{display:none}
  .rail-badge{align-self:flex-start}

  .nav-capsule{
    position:static;
    display:block;
    margin:28px 16px 0;
    padding:10px;
    max-height:none;
    overflow:visible;
    border-radius:26px;
    background:rgba(18,50,82,.55);
    box-shadow:none;
  }

  .nav-link{
    padding:11px 14px;
    font-size:14.5px;
  }

  .nav-cta{
    margin:14px 6px 4px;
  }

  .section{padding-block:76px}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:1320px){
  :root{--shell-max:1240px}
}

/* 13. 减弱动效 ------------------------------------------------------------ */
@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;
  }
}