/* ============================================================
   /assets/site.css — 星投品牌站 共享外壳
   01 tokens / 02 reset / 03 base / 04 utilities
   05 header / 06 footer / 07 backtop & motion / 08 responsive
   ============================================================ */

/* ── 01 TOKENS ───────────────────────────────────────────── */
:root{
  --ink-900:#07090E;
  --ink-800:#0E131C;
  --ink-700:#161D28;
  --line:#2C3644;
  --line-soft:rgba(44,54,68,.62);
  --star:#E9EEF6;
  --dust:#9BA7BA;
  --dust-dim:#6C7A8E;
  --flame:#FF6A2B;
  --cyan:#2DE2E6;
  --mint:#4EF0B0;
  --amber:#FFC24D;
  --grad:linear-gradient(135deg,#FF6A2B 0%,#2DE2E6 100%);
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:var(--font-sans);
  --font-mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --page-max:1320px;
  --page-pad:clamp(16px,4.2vw,44px);
  --gap:clamp(16px,2.4vw,32px);
  --ease:cubic-bezier(.25,.6,.25,1);
}

/* ── 02 RESET ────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100vh}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(45,226,230,.28);color:var(--star)}
:where(a,button,summary,input,select,textarea):focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
}

/* ── 03 BASE ─────────────────────────────────────────────── */
body{
  background-color:var(--ink-900);
  background-image:
    radial-gradient(940px 540px at 84% -10%, rgba(45,226,230,.10), transparent 62%),
    radial-gradient(780px 470px at 6% 0%, rgba(255,106,43,.09), transparent 64%);
  background-repeat:no-repeat;
  color:var(--star);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.22;
  letter-spacing:-.005em;
  color:var(--star);
  font-stretch:87%;
  text-wrap:balance;
}
h1{font-size:clamp(28px,4.6vw,56px)}
h2{font-size:clamp(22px,3vw,36px)}
h3{font-size:clamp(18px,2vw,26px)}
h4{font-size:clamp(16px,1.3vw,20px)}
.mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
}
.prose{max-width:38em;font-size:16px;line-height:1.85;color:var(--dust)}
.prose > * + *{margin-top:1em}
.prose strong,.prose b{color:var(--star);font-weight:700}
.prose h2,.prose h3{color:var(--star);margin-top:1.6em}
.link{
  color:var(--cyan);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
  transition:color .16s var(--ease);
}
.link:hover{color:var(--mint)}

/* ── 04 UTILITIES ────────────────────────────────────────── */
.wrap{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding-inline:var(--page-pad);
}
.section{padding-block:clamp(40px,6vw,84px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px 24px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
  margin-bottom:clamp(20px,3vw,36px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--dust-dim);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--flame);flex:0 0 auto}
.divider{height:1px;background:var(--line);border:0;margin-block:clamp(20px,3vw,36px)}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:#06121a;
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* grid */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.grid-12 > *{min-width:0}
.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* patterns */
.pattern-grid{
  background-image:
    linear-gradient(rgba(44,54,68,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(44,54,68,.55) 1px,transparent 1px);
  background-size:24px 24px;
}
.pattern-dots{
  background-image:radial-gradient(rgba(155,167,186,.34) 1px,transparent 1px);
  background-size:6px 6px;
}

/* buttons */
.btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:9px 14px;
  border:1px solid var(--line);
  border-radius:0;
  font-size:13px;
  line-height:1.2;
  letter-spacing:.05em;
  white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease),filter .18s var(--ease);
}
.btn__label{display:inline-block}
.btn--ghost{color:var(--dust);background:rgba(22,29,40,.66)}
.btn--ghost:hover{color:var(--cyan);border-color:var(--cyan);background:rgba(45,226,230,.08)}
.btn--flame{
  color:#07090E;
  font-weight:700;
  background:var(--grad);
  border-color:transparent;
}
.btn--flame:hover{filter:brightness(1.1)}
.btn--sm{padding:6px 10px;font-size:12px}
.btn--block{display:flex;width:100%}
.copy-echo{
  position:absolute;
  right:0;
  bottom:calc(100% + 9px);
  padding:2px 7px;
  border:1px solid var(--line);
  background:var(--ink-700);
  color:var(--mint);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.04em;
  white-space:nowrap;
  opacity:0;
  transform:translateY(5px);
  pointer-events:none;
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.copy-echo.is-on{opacity:1;transform:translateY(0)}

/* breadcrumbs */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--dust-dim);
}
.crumbs__item{display:inline-flex;align-items:center;gap:8px}
.crumbs__item + .crumbs__item::before{content:"/";color:var(--line)}
.crumbs a{transition:color .16s var(--ease)}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--mint)}

/* panels & tags */
.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(16px,2.4vw,28px);
}
.panel--raise{background:var(--ink-700)}
.panel--accent{border-left:2px solid var(--flame)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:2px 8px;
  border:1px solid var(--line);
  background:rgba(22,29,40,.72);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--dust);
}
.tag--flame{color:var(--flame);border-color:rgba(255,106,43,.55)}
.tag--cyan{color:var(--cyan);border-color:rgba(45,226,230,.5)}
.tag--mint{color:var(--mint);border-color:rgba(78,240,176,.5)}
.tag--amber{color:var(--amber);border-color:rgba(255,194,77,.5)}

/* image containers (pages.image_opportunities 使用) */
.figure{display:grid;gap:10px;margin:0}
.figure__frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background-color:var(--ink-700);
  background-image:
    radial-gradient(120% 130% at 10% -10%, rgba(255,106,43,.16), transparent 58%),
    radial-gradient(110% 110% at 92% 108%, rgba(45,226,230,.18), transparent 60%);
}
.figure__frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(44,54,68,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(44,54,68,.55) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.55;
  pointer-events:none;
}
.figure__frame > img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__cap{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.05em;
  color:var(--dust-dim);
}
.figure--hero .figure__frame{aspect-ratio:21/9}
.figure--wide{margin-right:calc(-1 * clamp(12px,2.4vw,40px))}
.figure--tall .figure__frame{aspect-ratio:4/5}

/* ── 05 HEADER ───────────────────────────────────────────── */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(7,9,14,.94);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.site-header::before{
  content:"";
  display:block;
  height:2px;
  background:var(--grad);
  opacity:.85;
}
.site-header.is-compact{background:rgba(7,9,14,.98);border-bottom-color:#39465a}
.site-header__bar{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding:13px var(--page-pad);
  min-height:74px;
  transition:min-height .2s var(--ease),padding .2s var(--ease);
}
.site-header.is-compact .site-header__bar{min-height:56px;padding-block:7px}

/* brand */
.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  color:var(--star);
}
.brand__glyph{
  position:relative;
  display:block;
  width:24px;
  height:24px;
  flex:0 0 auto;
  border:1px solid var(--cyan);
}
.brand__glyph::before{
  content:"";
  position:absolute;
  inset:5px;
  border:1px solid var(--flame);
  transform:rotate(45deg);
}
.brand__glyph::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:3px;
  height:3px;
  margin:-1.5px 0 0 -1.5px;
  background:var(--mint);
  border-radius:50%;
  box-shadow:0 0 7px rgba(78,240,176,.9);
}
.brand__text{display:grid;gap:1px}
.brand__name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  line-height:1.15;
  letter-spacing:.02em;
  font-stretch:87%;
  color:var(--star);
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:9px;
  line-height:1.2;
  letter-spacing:.2em;
  color:var(--dust-dim);
}
.site-header.is-compact .brand__sub{display:none}

/* version chip */
.ver-chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  flex:0 0 auto;
  padding:4px 9px;
  border:1px solid var(--line);
  background:rgba(22,29,40,.74);
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.06em;
}
.ver-chip::before{
  content:"";
  width:5px;
  height:5px;
  flex:0 0 auto;
  background:var(--mint);
  border-radius:50%;
  box-shadow:0 0 7px rgba(78,240,176,.85);
  animation:ver-pulse 2.6s ease-in-out infinite;
}
@keyframes ver-pulse{
  0%,100%{opacity:1}
  50%{opacity:.32}
}
.ver-chip__key{font-size:9px;letter-spacing:.18em;color:var(--dust-dim)}
.ver-chip__val{color:var(--mint)}

/* nav */
.site-nav{flex:1 1 auto;min-width:0}
.site-nav__list{display:flex;align-items:stretch;flex-wrap:nowrap}
.site-nav__item{
  display:flex;
  align-items:center;
  border-left:1px solid var(--line);
}
.site-nav__item:last-child{border-right:1px solid var(--line)}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:6px 12px;
  font-size:14px;
  letter-spacing:.02em;
  color:var(--dust);
  white-space:nowrap;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.site-nav__label{display:inline}
.site-nav__idx{
  font-family:var(--font-mono);
  font-size:9px;
  letter-spacing:.08em;
  color:var(--dust-dim);
  transition:color .16s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:0;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.site-nav__link:hover{color:var(--star);background:rgba(45,226,230,.06)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link:hover .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--star);background:rgba(45,226,230,.08)}
.site-nav__link[aria-current="page"]::after{
  height:2px;
  background:var(--grad);
  transform:scaleX(1);
}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--mint)}

/* header actions */
.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  margin-left:auto;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  border:1px solid var(--line);
  background:rgba(22,29,40,.72);
  color:var(--star);
  font-size:13px;
  letter-spacing:.05em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:16px;flex:0 0 auto}
.nav-toggle__bars i{
  display:block;
  height:1px;
  background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{display:inline-block}

/* ── 06 FOOTER ───────────────────────────────────────────── */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink-800);
  border-top:1px solid var(--line);
  color:var(--dust);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:2px;
  background:var(--grad);
  opacity:.72;
}
.site-footer__inner{padding-block:clamp(32px,5vw,64px) clamp(18px,3vw,28px)}
.footer-top{
  display:grid;
  grid-template-columns:1.6fr .8fr .8fr 1.2fr;
  gap:clamp(24px,3.5vw,56px);
  padding-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.footer-brand__name{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:18px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--star);
  font-stretch:87%;
}
.footer-brand__mark{
  position:relative;
  display:block;
  width:16px;
  height:16px;
  flex:0 0 auto;
  border:1px solid var(--cyan);
}
.footer-brand__mark::before{
  content:"";
  position:absolute;
  inset:4px;
  background:var(--flame);
  transform:rotate(45deg);
}
.footer-brand__desc{
  margin-top:14px;
  max-width:30ch;
  font-size:14px;
  line-height:1.85;
  color:var(--dust);
}
.footer-brand__meta{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--dust-dim);
}
.footer-brand__meta .mono{color:var(--mint)}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:9px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--dust-dim);
}
.footer-col__title::before{content:"";width:14px;height:1px;background:var(--flame);flex:0 0 auto}
.footer-list{display:grid;gap:2px}
.footer-list__link{
  display:inline-flex;
  align-items:center;
  padding-block:3px;
  font-size:14px;
  color:var(--dust);
  transition:color .16s var(--ease),padding-left .2s var(--ease);
}
.footer-list__link::before{
  content:"";
  width:0;
  height:1px;
  background:var(--cyan);
  transition:width .2s var(--ease),margin-right .2s var(--ease);
}
.footer-list__link:hover{color:var(--cyan)}
.footer-list__link:hover::before{width:14px;margin-right:8px}
.footer-contact{display:grid;gap:9px;font-size:14px}
.footer-contact__row{
  display:grid;
  grid-template-columns:40px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--dust-dim);
}
.footer-contact__val{color:var(--star);line-height:1.7}
.footer-contact__note{
  margin-top:14px;
  max-width:34ch;
  font-size:12px;
  line-height:1.75;
  color:var(--dust-dim);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 26px;
  padding-top:clamp(16px,2.4vw,22px);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.05em;
  color:var(--dust-dim);
}
.footer-legal,.footer-copy{color:var(--dust-dim)}
.footer-version{margin-left:auto;color:var(--dust-dim)}
.footer-version .mono{color:var(--mint)}

/* ── 07 BACKTOP & MOTION ─────────────────────────────────── */
.backtop{
  position:fixed;
  right:clamp(12px,2vw,22px);
  bottom:clamp(12px,2vw,22px);
  z-index:90;
  display:grid;
  place-items:center;
  gap:1px;
  width:54px;
  height:54px;
  padding:0;
  border:1px solid var(--line);
  background:rgba(14,19,28,.94);
  color:var(--star);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.02em;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s,border-color .18s var(--ease);
}
.backtop.is-on{opacity:1;visibility:visible;transform:translateY(0)}
.backtop:hover{border-color:var(--cyan);color:var(--cyan)}
.backtop__arrow{font-size:13px;line-height:1;color:var(--cyan)}
.backtop__pct{line-height:1.1}
.backtop__bar{
  position:absolute;
  left:0;bottom:0;
  height:2px;
  width:calc(var(--read,0) * 1%);
  max-width:100%;
  background:var(--grad);
  transition:width .12s linear;
}

.js-ready [data-reveal]{opacity:0;transform:translateY(14px)}
.js-ready [data-reveal].is-in{
  opacity:1;
  transform:none;
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}

/* ── 08 RESPONSIVE ───────────────────────────────────────── */
@media (max-width:1024px){
  .btn--copy{display:none}
  .nav-toggle{display:inline-flex}
  .header-actions{margin-left:auto}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    background:var(--ink-800);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    transition:max-height .26s var(--ease),visibility .26s var(--ease);
  }
  .site-nav[data-open="true"]{
    max-height:min(72vh,540px);
    overflow-y:auto;
    visibility:visible;
  }
  .site-nav__list{display:block;padding-block:4px}
  .site-nav__item{
    display:block;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .site-nav__item:first-child{border-top:0}
  .site-nav__item:last-child{border-right:0}
  .site-nav__link{
    justify-content:flex-start;
    padding:13px clamp(16px,4.2vw,44px);
    font-size:16px;
    background:none;
  }
  .site-nav__link::after{left:clamp(16px,4.2vw,44px);right:auto;width:calc(100% - clamp(32px,8.4vw,88px))}
  .site-nav__link[aria-current="page"]{background:rgba(45,226,230,.07)}
  .site-nav__idx{font-size:10px}
  .span-2,.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-version{margin-left:0;flex:1 1 100%}
}
@media (max-width:720px){
  body{font-size:15px}
  .brand__name{font-size:16px}
  .brand__sub{display:none}
  .ver-chip__key{display:none}
  .btn{padding:8px 11px;font-size:12px}
  .figure--wide{margin-right:0}
  .figure__frame{aspect-ratio:4/3}
  .figure--hero .figure__frame{aspect-ratio:16/9}
  .footer-contact__row{grid-template-columns:36px minmax(0,1fr)}
}
@media (max-width:600px){
  .site-header__bar{flex-wrap:wrap;row-gap:10px;padding-block:10px}
  .site-header.is-compact .site-header__bar{padding-block:8px}
  .brand{flex:1 1 auto}
  .header-actions{flex:1 1 100%;justify-content:space-between;margin-left:0}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-bottom{gap:4px 18px}
  .backtop{width:48px;height:48px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
}