/* ============================================================
   银河娱乐主站 · /assets/site.css
   星海观测站基础层：reset / 变量 / 中文排版 / 头部 / 页脚
   / 通用按钮 / 面包屑 / 正文 / 网格 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --void:#050B18;
  --deep:#0B1B3A;
  --panel:#12264D;
  --violet:#6C4AB6;
  --cyan:#35D0BA;
  --gold:#F2B84B;
  --ink:#F4F7FF;
  --muted:#A9B7D6;
  --line:#2A3F6E;
  --ok:#5CE1A4;

  --font-display:"Space Grotesk","Noto Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",ui-monospace,monospace;

  --container:1200px;
  --radius:4px;
  --gap:clamp(14px,2vw,24px);
  --shadow-hard:6px 6px 0 rgba(5,11,24,.85);
  --shadow-soft:0 18px 42px rgba(3,7,16,.55);
  --ease:cubic-bezier(.22,.7,.2,1);
  --header-h:78px;
}

/* ---------- 3. 基础与中文排版 ---------- */
html{scroll-behavior:smooth}
body{
  min-height:100vh;
  background-color:var(--deep);
  background-image:
    radial-gradient(1100px 620px at 84% -10%, rgba(108,74,182,.34), transparent 62%),
    radial-gradient(900px 540px at 2% 2%, rgba(53,208,186,.15), transparent 60%),
    radial-gradient(760px 700px at 52% 112%, rgba(242,184,75,.08), transparent 66%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.24;
  letter-spacing:.035em;
  color:var(--ink);
}
p{line-height:1.78}
strong{color:#FFFFFF;font-weight:700}
::selection{background:rgba(108,74,182,.6);color:#fff}

.display-1{font-size:clamp(30px,5vw,56px);letter-spacing:.015em;line-height:1.1}
.display-2{font-size:clamp(25px,3.6vw,40px);letter-spacing:.02em;line-height:1.18}
.display-3{font-size:clamp(20px,2.6vw,32px);letter-spacing:.03em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 10px var(--cyan);
}
.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;
}

/* 焦点可见 */
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- 4. 容器 / 分区 / 堆叠 ---------- */
.container{
  width:min(var(--container), 100% - clamp(32px,8vw,96px));
  margin-inline:auto;
}
.band{padding-block:clamp(40px,6vw,88px)}
.band--panel{
  background:linear-gradient(180deg, rgba(18,38,77,.62), rgba(11,27,58,.18));
  border-block:1px solid rgba(42,63,110,.65);
}
.stack{display:flex;flex-direction:column;gap:var(--gap)}

#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}

/* ---------- 5. 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--ink);
  --btn-bd:var(--line);
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;
  font-family:var(--font-body);font-size:14px;font-weight:600;
  letter-spacing:.045em;line-height:1;
  text-decoration:none;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:2px solid var(--btn-bd);
  border-radius:3px;
  cursor:pointer;
  transition:transform .16s var(--ease), box-shadow .16s var(--ease),
             background-color .16s ease, border-color .16s ease, color .16s ease;
}
.btn:hover{transform:translate(-1px,-1px)}
.btn:active{transform:translate(0,0);box-shadow:none}
.btn--primary{
  --btn-bg:linear-gradient(135deg,var(--violet) 0%, #4B33A3 100%);
  --btn-fg:#FFFFFF;
  --btn-bd:#8B6BE0;
  box-shadow:4px 4px 0 rgba(5,11,24,.9);
}
.btn--primary:hover{box-shadow:5px 5px 0 rgba(53,208,186,.45)}
.btn--ghost{
  --btn-bg:rgba(11,27,58,.6);
  --btn-fg:var(--muted);
  --btn-bd:var(--line);
}
.btn--ghost:hover{--btn-fg:var(--ink);--btn-bd:var(--cyan);box-shadow:4px 4px 0 rgba(53,208,186,.25)}
.btn--gold{
  --btn-bg:rgba(242,184,75,.12);
  --btn-fg:var(--gold);
  --btn-bd:rgba(242,184,75,.65);
}
.btn--gold:hover{--btn-bg:rgba(242,184,75,.2);box-shadow:4px 4px 0 rgba(242,184,75,.3)}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .26s ease, border-color .26s ease,
             box-shadow .26s ease, backdrop-filter .26s ease;
}
.site-header.is-solid{
  background:rgba(5,11,24,.95);
  border-bottom-color:var(--line);
  box-shadow:0 14px 34px rgba(3,7,16,.6);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.site-header[data-open="true"]{
  background:rgba(5,11,24,.98);
  border-bottom-color:var(--line);
}

.header-bar{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
  min-height:var(--header-h);
  padding-block:12px;
}

/* 品牌 */
.brand{
  display:flex;align-items:center;gap:12px;
  flex:0 0 auto;
  text-decoration:none;color:var(--ink);
}
.brand__mark{
  position:relative;
  display:grid;place-items:center;
  width:38px;height:38px;flex:0 0 auto;
  border:2px solid var(--line);
  border-radius:50%;
  background:radial-gradient(circle at 50% 50%, rgba(108,74,182,.6), rgba(11,27,58,.95) 72%);
  box-shadow:0 0 0 4px rgba(53,208,186,.06), inset 0 0 14px rgba(53,208,186,.24);
  transition:border-color .2s ease, box-shadow .2s ease;
}
.brand__mark::after{
  content:"";position:absolute;inset:-7px;
  border:1px dashed rgba(53,208,186,.36);
  border-radius:50%;
  transform:rotate(-18deg) scaleY(.5);
  transition:transform .4s var(--ease);
}
.brand:hover .brand__mark{border-color:var(--cyan);box-shadow:0 0 0 4px rgba(53,208,186,.14), inset 0 0 16px rgba(53,208,186,.4)}
.brand:hover .brand__mark::after{transform:rotate(6deg) scaleY(.5)}
.brand__star{
  width:14px;height:14px;background:var(--cyan);
  clip-path:polygon(50% 0%,61% 39%,100% 50%,61% 61%,50% 100%,39% 61%,0% 50%,39% 39%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(16px,1.6vw,19px);letter-spacing:.07em;
}
.brand__tag{
  margin-top:4px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--muted);
}

/* 导航 */
.nav{margin-inline:auto}
.nav__list{display:flex;align-items:center;gap:clamp(2px,.8vw,10px)}
.nav__item{display:flex}
.nav__link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:8px 11px;
  text-decoration:none;color:var(--ink);
  border:1px solid transparent;border-radius:3px;
  transition:color .18s ease, background-color .18s ease, border-color .18s ease;
}
.nav__idx{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;
  color:var(--muted);transition:color .18s ease;
}
.nav__label{font-size:14.5px;font-weight:500;letter-spacing:.03em;white-space:nowrap}
.nav__link:hover{background:rgba(53,208,186,.09);border-color:rgba(53,208,186,.3);color:#fff}
.nav__link:hover .nav__idx{color:var(--cyan)}
.nav__link[aria-current="page"]{
  color:#fff;
  background:rgba(108,74,182,.24);
  border-color:rgba(108,74,182,.75);
}
.nav__link[aria-current="page"] .nav__idx{color:var(--gold)}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:-3px;
  width:5px;height:5px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 9px var(--cyan);
  transform:translateX(-50%);
}
.nav__actions{display:none}

.header-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;gap:9px;
  padding:10px 12px;
  color:var(--ink);
  background:rgba(11,27,58,.7);
  border:2px solid var(--line);
  border-radius:3px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .18s ease, background-color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bars{
  position:relative;display:block;width:16px;height:2px;
  background:var(--cyan);
  box-shadow:0 -6px 0 var(--cyan), 0 6px 0 var(--cyan);
  transition:background-color .18s ease, box-shadow .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;box-shadow:none}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{
  content:"";position:absolute;left:0;top:0;width:16px;height:2px;background:var(--gold);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:rotate(-45deg)}

/* 阅读进度轨 */
.scroll-rail{
  position:absolute;left:0;right:0;bottom:-2px;height:2px;
  overflow:hidden;pointer-events:none;
}
.scroll-rail__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg, var(--violet) 0%, var(--cyan) 62%, var(--gold) 100%);
  box-shadow:0 0 12px rgba(53,208,186,.7);
  transition:width .1s linear;
}

/* 跳转链接 */
.skip-link{
  position:absolute;left:16px;top:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;
  background:var(--gold);color:#231708;
  font-family:var(--font-body);font-weight:700;font-size:14px;
  letter-spacing:.04em;text-decoration:none;
  border:2px solid #8A6222;border-radius:3px;
  box-shadow:3px 3px 0 rgba(5,11,24,.9);
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,120px);
  padding-block:clamp(40px,6vw,76px) clamp(24px,4vw,40px);
  background:
    radial-gradient(700px 320px at 10% 0%, rgba(108,74,182,.28), transparent 70%),
    radial-gradient(560px 280px at 92% 12%, rgba(53,208,186,.12), transparent 72%),
    var(--void);
  border-top:2px solid var(--line);
  color:var(--ink);
}
.site-footer::before{
  content:"";position:absolute;top:-2px;left:0;
  width:min(320px,46%);height:2px;
  background:linear-gradient(90deg, var(--violet), var(--cyan), transparent);
}

.footer-grid{
  display:grid;grid-template-columns:1fr;
  gap:clamp(28px,4vw,52px);
}
.footer-brand__name{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(19px,2vw,22px);letter-spacing:.08em;
}
.footer-brand__line{
  margin-top:12px;max-width:42ch;
  font-size:15px;line-height:1.85;color:var(--muted);
}
.footer-brand__stamp{
  display:inline-block;margin-top:16px;
  padding:5px 10px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;
  color:var(--cyan);
  border:1px solid rgba(53,208,186,.35);
  border-radius:2px;
  background:rgba(53,208,186,.06);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--gold);
  padding-bottom:10px;
  border-bottom:1px solid rgba(42,63,110,.85);
}
.footer-links{margin-top:14px}
.footer-links li + li{margin-top:10px}
.footer-links a{
  position:relative;
  font-size:15px;color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease, border-color .18s ease;
}
.footer-links a:hover{color:var(--cyan);border-bottom-color:rgba(53,208,186,.6)}

.footer-meta{
  display:grid;gap:14px 28px;
  margin-top:clamp(30px,4vw,50px);
  padding-top:clamp(20px,3vw,28px);
  border-top:1px solid rgba(42,63,110,.7);
}
.footer-meta__row{display:flex;flex-direction:column;gap:4px}
.footer-meta__key{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--muted);
}
.footer-meta__val{
  font-size:14.5px;line-height:1.7;color:var(--ink);
  overflow-wrap:anywhere;
}
.footer-note{
  margin-top:18px;max-width:78ch;
  font-size:13px;line-height:1.85;color:var(--muted);
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(24px,3vw,36px);
  padding-top:18px;
  border-top:1px solid rgba(42,63,110,.7);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--muted);
}
.footer-base__legal{color:var(--muted)}
.footer-base__copy{color:var(--muted)}

/* ---------- 8. 面包屑 ---------- */
.crumbs{margin-bottom:clamp(18px,3vw,30px)}
.crumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.crumbs__item{display:flex;align-items:center;gap:8px;color:var(--muted)}
.crumbs__item + .crumbs__item::before{
  content:"/";color:var(--line);margin-right:0;
}
.crumbs__link{
  color:var(--muted);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease, border-color .16s ease;
}
.crumbs__link:hover{color:var(--cyan);border-bottom-color:rgba(53,208,186,.6)}
.crumbs__item[aria-current="page"]{color:var(--ink)}

/* ---------- 9. 正文 ---------- */
.prose{
  max-width:70ch;
  font-size:clamp(15.5px,1.5vw,17px);
  line-height:1.85;
  color:var(--ink);
}
.prose p{margin-bottom:1.1em;color:var(--muted)}
.prose p strong{color:var(--ink)}
.prose h2,.prose h3{
  margin:1.9em 0 .65em;
  font-family:var(--font-display);
  letter-spacing:.04em;color:var(--ink);
}
.prose h2{font-size:clamp(20px,2.4vw,26px)}
.prose h3{font-size:clamp(17px,1.9vw,20px)}
.prose ul,.prose ol{
  margin:0 0 1.1em;padding-left:1.5em;
}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.5em;color:var(--muted)}
.prose li::marker{color:var(--cyan)}
.prose a{
  color:var(--cyan);text-decoration:underline;
  text-underline-offset:3px;text-decoration-thickness:1px;
}
.prose a:hover{color:#fff}
.prose hr{
  border:0;height:1px;margin:2em 0;
  background:linear-gradient(90deg,var(--line),transparent);
}

/* ---------- 10. 网格与卡片 ---------- */
.bento-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.cell{grid-column:span 12;min-width:0}

.card{
  position:relative;
  display:flex;flex-direction:column;gap:10px;
  padding:clamp(16px,2.2vw,26px);
  background:linear-gradient(158deg,#16305E 0%, var(--panel) 48%, #0E2044 100%);
  border:2px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  color:var(--ink);
  text-decoration:none;
}
.card--link{transition:transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s ease}
.card--link:hover{
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 rgba(5,11,24,.92);
  border-color:rgba(53,208,186,.55);
}
.card__head{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;flex-wrap:wrap;
}
.card__title{
  font-family:var(--font-display);
  font-size:clamp(17px,1.8vw,21px);
  font-weight:700;letter-spacing:.045em;color:var(--ink);
}
.card__body{margin:0;font-size:15px;line-height:1.8;color:var(--muted)}
.card__meta{
  font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
}

/* ---------- 11. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.1em;line-height:1.4;
  color:var(--muted);
  background:rgba(53,208,186,.07);
  border:1px solid var(--line);
  border-radius:2px;
  white-space:nowrap;
}
.tag::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:currentColor;
}
.tag--ok{color:var(--ok);border-color:rgba(92,225,164,.45);background:rgba(92,225,164,.08)}
.tag--gold{color:var(--gold);border-color:rgba(242,184,75,.5);background:rgba(242,184,75,.08)}
.tag--violet{color:#C6B3F2;border-color:rgba(108,74,182,.7);background:rgba(108,74,182,.16)}

/* ---------- 12. 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(circle at 28% 18%, rgba(108,74,182,.55), transparent 58%),
    radial-gradient(circle at 76% 78%, rgba(53,208,186,.3), transparent 56%),
    var(--void);
  box-shadow:var(--shadow-hard);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(244,247,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,247,255,.05) 1px, transparent 1px);
  background-size:34px 34px;
  mix-blend-mode:screen;
  opacity:.55;
}
.media__img{
  display:block;width:100%;height:100%;
  object-fit:cover;object-position:center;
}
.media__caption{
  margin-top:10px;
  font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.08em;color:var(--muted);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}

/* ---------- 13. 滚动显现 ---------- */
@media (prefers-reduced-motion:no-preference){
  .is-pending{
    opacity:0;
    transform:translateY(16px);
    transition:
      opacity .55s ease var(--delay,0ms),
      transform .55s var(--ease) var(--delay,0ms);
    will-change:opacity,transform;
  }
  .is-pending.is-in{opacity:1;transform:none}
}

/* ---------- 14. 响应式 ---------- */
@media (min-width:640px){
  .footer-meta{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:720px){
  .cell--4{grid-column:span 4}
  .cell--6{grid-column:span 6}
  .cell--8{grid-column:span 8}
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr}
  .footer-meta{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (max-width:1023px){
  :root{--header-h:64px}
  .header-bar{padding-block:10px;gap:12px}
  .brand__tag{display:none}
  .brand__mark{width:34px;height:34px}
  .brand__mark::after{inset:-6px}
  .header-tools{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .nav{
    position:absolute;
    top:100%;left:0;right:0;
    margin:0;
    display:none;
    padding:14px clamp(16px,4vw,28px) 22px;
    background:rgba(5,11,24,.985);
    border-bottom:2px solid var(--line);
    box-shadow:0 26px 52px rgba(3,7,16,.72);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .site-header[data-open="true"] .nav{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    flex-direction:row;align-items:center;justify-content:space-between;
    padding:14px 12px;border-radius:0;
    border-bottom:1px solid rgba(42,63,110,.6);
  }
  .nav__idx{order:2;font-size:11px}
  .nav__label{font-size:15.5px}
  .nav__link[aria-current="page"]{background:rgba(108,74,182,.2);border-color:transparent;border-bottom-color:rgba(108,74,182,.6)}
  .nav__link[aria-current="page"]::after{display:none}
  .nav__actions{
    display:flex;flex-direction:column;gap:10px;
    margin-top:18px;
  }
  .nav__actions .btn{width:100%;padding:13px 18px}
}

@media (max-width:639px){
  body{background-attachment:scroll}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .band{padding-block:clamp(32px,8vw,56px)}
}

@media (min-width:1280px){
  .cell--3{grid-column:span 3}
  .cell--9{grid-column:span 9}
  .cell--12{grid-column:span 12}
}

/* ---------- 15. 动效降级 ---------- */
@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;
  }
  .scroll-rail__fill{transition:none}
  .btn:hover{transform:none}
  .card--link:hover{transform:none}
}