/* =========================================================
   PG游艺 · /assets/site.css
   共享外壳：reset / tokens / 头部 / 页脚 / 基础组件
   深海蓝 + 电光紫 · 霓虹夜游 · 切角与斜线
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --abyss:#04122A;
  --deep:#0A2148;
  --volt:#7A3CFF;
  --violet:#4B1FA8;
  --neon:#2BE6D6;
  --coral:#FF6B4A;
  --paper:#F4F7FF;
  --mist:#9FB3D9;
  --tropic:#0E8C6E;
  --sand:#FFD166;

  --ink:var(--paper);
  --ink-soft:rgba(244,247,255,.78);
  --ink-dim:var(--mist);
  --line:rgba(159,179,217,.22);
  --line-strong:rgba(159,179,217,.42);

  --font-display:'HarmonyOS Sans SC','Noto Sans SC','Source Han Sans SC','PingFang SC',system-ui,-apple-system,'Microsoft YaHei',sans-serif;
  --font-body:'HarmonyOS Sans SC','Noto Sans SC','PingFang SC',system-ui,-apple-system,'Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,'Courier New',monospace;

  --radius:8px;
  --angle:-3deg;
  --head-h:76px;
  --max:1280px;
  --pad:clamp(18px,4vw,44px);
  --ease:cubic-bezier(.16,1,.3,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{-webkit-tap-highlight-color:transparent}

/* ---------- 3. 中文排版与页面底色 ---------- */
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--head-h) + 12px);
}
body{
  min-height:100vh;
  background-color:var(--abyss);
  background-image:
    radial-gradient(1100px 620px at 84% -10%, rgba(122,60,255,.30), transparent 62%),
    radial-gradient(820px 520px at 2% 4%, rgba(43,230,214,.13), transparent 60%),
    radial-gradient(960px 720px at 50% 120%, rgba(75,31,168,.34), transparent 64%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.005em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:repeating-linear-gradient(180deg, rgba(43,230,214,.05) 0 1px, transparent 1px 5px);
  opacity:.35;
}
body[data-nav-open]{overflow:hidden}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(40px,6vw,96px);font-weight:900}
h2{font-size:clamp(28px,3.4vw,48px)}
h3{font-size:clamp(21px,2.2vw,34px)}
h4{font-size:clamp(18px,1.8vw,20px)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--neon);text-decoration-thickness:1px;text-underline-offset:3px}
strong,b{font-weight:800;color:var(--ink)}
small{font-size:13px}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:4px}

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

/* ---------- 4. 布局容器 ---------- */
.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--pad)}
.section{position:relative;padding-block:clamp(56px,8vw,112px)}
.section--tight{padding-block:clamp(32px,5vw,64px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px 28px;margin-bottom:clamp(22px,3vw,44px);
}
.section__title{margin:0}

.grid{display:grid;gap:clamp(16px,2vw,24px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:1100px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:980px){
  .grid--7-5,.grid--8-4,.grid--3{grid-template-columns:1fr}
}
@media (max-width:640px){
  .grid--4{grid-template-columns:1fr}
}

.slash{
  display:block;width:100%;height:2px;border:0;
  background:linear-gradient(90deg, rgba(43,230,214,.75), rgba(122,60,255,.55) 42%, transparent 88%);
  transform:rotate(var(--angle));
  transform-origin:left center;
}

/* ---------- 5. 通用元素 ---------- */
.label{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:13px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--mist);
}
.label::before{content:"";flex:0 0 auto;width:22px;height:1px;background:var(--neon)}

.num{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
  color:var(--neon);
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 28px;border-radius:var(--radius);
  font-family:var(--font-body);font-size:16px;font-weight:800;line-height:1;
  text-decoration:none;border:1px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease), box-shadow .18s var(--ease), background .18s, border-color .18s, color .18s;
}
.btn:hover{transform:translateY(-3px)}
.btn:active{transform:translateY(-1px)}
.btn--volt{background:linear-gradient(120deg,var(--volt),var(--violet));color:var(--paper);box-shadow:0 14px 30px -16px rgba(122,60,255,.95)}
.btn--volt:hover{box-shadow:0 22px 40px -18px rgba(122,60,255,1)}
.btn--neon{background:linear-gradient(120deg,var(--neon),#8DF3E8);color:var(--abyss);box-shadow:0 14px 30px -18px rgba(43,230,214,.95)}
.btn--coral{background:var(--coral);color:#2A0B04;box-shadow:0 14px 30px -18px rgba(255,107,74,.9)}
.btn--ghost{background:rgba(10,33,72,.6);border-color:var(--line-strong);color:var(--ink)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon)}
.btn--sm{padding:11px 18px;font-size:14px}

.panel{
  --cut:16px;
  position:relative;
  padding:clamp(20px,3vw,34px);
  background:linear-gradient(155deg, rgba(10,33,72,.94), rgba(4,18,42,.94));
  box-shadow:inset 0 0 0 1px rgba(159,179,217,.2), 0 24px 54px -30px rgba(0,0,0,.95);
  clip-path:polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.panel--volt{background:linear-gradient(155deg, rgba(75,31,168,.55), rgba(4,18,42,.95))}
.panel--neon{box-shadow:inset 0 0 0 1px rgba(43,230,214,.35), 0 24px 54px -30px rgba(0,0,0,.95)}

.frame{
  position:relative;display:block;width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border-radius:var(--radius);
  background:linear-gradient(150deg, var(--deep), #0B0A26 55%, var(--abyss));
  box-shadow:inset 0 0 0 1px rgba(159,179,217,.18);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.frame > img{display:block;width:100%;height:100%;object-fit:cover}
.frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(200deg, rgba(122,60,255,.22), transparent 44%, rgba(4,18,42,.55));
}
.frame--wide{aspect-ratio:21 / 9}
.frame--tall{aspect-ratio:4 / 5}
.frame--square{aspect-ratio:1 / 1}
.frame__cap{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:16px 18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--paper);background:linear-gradient(0deg, rgba(4,18,42,.88), transparent);
}

.crumbs{padding-block:22px 0}
.crumbs ol{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--mist);
}
.crumbs li{display:flex;align-items:center}
.crumbs li + li::before{content:"/";margin-right:10px;color:rgba(159,179,217,.45)}
.crumbs a{color:var(--mist);text-decoration:none}
.crumbs a:hover{color:var(--neon)}
.crumbs [aria-current="page"]{color:var(--paper)}

.prose{max-width:38em;font-size:17px;line-height:1.85;color:var(--ink-soft)}
.prose h2{font-size:clamp(24px,2.6vw,34px);margin-top:1.8em;margin-bottom:.6em;color:var(--ink)}
.prose h3{font-size:clamp(19px,2vw,24px);margin-top:1.6em;margin-bottom:.5em;color:var(--ink)}
.prose p{margin:0 0 1.15em}
.prose ul,.prose ol{padding-left:1.35em;margin:0 0 1.15em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.5em}
.prose strong{color:var(--ink)}
.prose a{color:var(--neon)}

/* ---------- 6. 顶部进度条 ---------- */
.progress{
  position:fixed;top:0;left:0;z-index:120;
  height:2px;width:0;
  pointer-events:none;
  background:linear-gradient(90deg, var(--volt), var(--neon));
  box-shadow:0 0 10px rgba(43,230,214,.8);
}

/* ---------- 7. 头部 ---------- */
.skip-link{
  position:absolute;left:12px;top:-70px;z-index:200;
  padding:12px 20px;border-radius:var(--radius);
  background:var(--neon);color:var(--abyss);
  font-weight:800;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

.site-head{
  position:sticky;top:0;z-index:80;
  padding-block:14px;
  transition:padding-block .35s var(--ease);
}
.site-head::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg, transparent, rgba(122,60,255,.55), rgba(43,230,214,.55), transparent);
  opacity:.45;
  transition:opacity .3s;
}
.site-head[data-stuck]::after{opacity:.8}

.site-head__bar{
  display:flex;align-items:center;
  gap:clamp(14px,3vw,48px);
  padding:8px 0;
  border:1px solid transparent;
  border-radius:999px;
  transition:background .35s var(--ease), box-shadow .35s var(--ease), padding .35s var(--ease), border-color .35s var(--ease);
}
.site-head[data-stuck] .site-head__bar{
  padding:7px clamp(14px,2.2vw,24px);
  background:rgba(10,33,72,.74);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-color:rgba(122,60,255,.45);
  box-shadow:0 18px 42px -22px rgba(4,18,42,.95), inset 0 1px 0 rgba(43,230,214,.14);
}

.brand{
  display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;
  text-decoration:none;color:var(--paper);
}
.brand__mark{
  position:relative;flex:0 0 auto;width:30px;height:30px;border-radius:7px;
  background:
    radial-gradient(circle at 26% 26%, var(--neon) 0 2px, transparent 2.8px),
    radial-gradient(circle at 74% 26%, var(--volt) 0 2px, transparent 2.8px),
    radial-gradient(circle at 26% 74%, var(--volt) 0 2px, transparent 2.8px),
    radial-gradient(circle at 74% 74%, var(--neon) 0 2px, transparent 2.8px),
    linear-gradient(135deg, var(--violet), var(--deep));
  box-shadow:0 0 0 1px rgba(43,230,214,.35), inset 0 0 12px rgba(43,230,214,.22);
  transform:rotate(-3deg);
}
.brand__text{display:flex;flex-direction:column;gap:3px}
.brand__name{
  font-family:var(--font-display);
  font-size:21px;font-weight:900;line-height:1;letter-spacing:-.02em;
}
.brand__meta{
  font-family:var(--font-mono);
  font-size:10px;line-height:1;letter-spacing:.28em;
  color:var(--mist);
}

.nav{margin-left:auto}
.nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,24px)}
.nav__link{
  position:relative;display:inline-block;
  padding:8px 2px;
  font-size:15px;font-weight:600;letter-spacing:.01em;
  color:rgba(244,247,255,.78);
  text-decoration:none;
  transition:color .18s;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;border-radius:2px;
  background:linear-gradient(90deg, var(--volt), var(--neon));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav__link:hover{color:var(--paper)}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--paper);font-weight:800}

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

.head-cta{
  display:inline-flex;align-items:center;gap:8px;white-space:nowrap;
  padding:11px 18px;border-radius:999px;
  font-size:13.5px;font-weight:800;line-height:1;letter-spacing:.02em;
  color:var(--abyss);text-decoration:none;
  background:linear-gradient(120deg, var(--neon), #8DF3E8);
  box-shadow:0 12px 26px -14px rgba(43,230,214,.95);
  transition:transform .18s var(--ease), box-shadow .18s var(--ease);
}
.head-cta::before{
  content:"";flex:0 0 auto;width:7px;height:7px;border-radius:2px;
  background:var(--abyss);opacity:.85;
}
.head-cta:hover{transform:translateY(-2px);box-shadow:0 18px 32px -14px rgba(43,230,214,1)}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:46px;height:46px;padding:0;
  border-radius:var(--radius);cursor:pointer;
  border:1px solid var(--line-strong);
  background:rgba(10,33,72,.72);
  color:var(--paper);
  transition:border-color .18s, background .18s;
}
.nav-toggle:hover{border-color:var(--neon)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:20px}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:var(--paper);
  transition:transform .26s var(--ease), opacity .2s, width .26s;
}
.nav-toggle__bars span:nth-child(2){width:14px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(7px) 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(-7px) rotate(-45deg)}

/* ---------- 8. 页脚 ---------- */
.site-foot{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding-top:clamp(48px,6vw,80px);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-foot__glow{
  position:absolute;z-index:0;left:-12%;right:-12%;bottom:-56px;height:170px;
  background:linear-gradient(100deg, rgba(122,60,255,.34), rgba(43,230,214,.16) 46%, transparent 78%);
  transform:rotate(-2.5deg);
  pointer-events:none;
}
.site-foot__inner{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.15fr 2fr;
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.site-foot__brand{display:flex;flex-direction:column;gap:14px}
.brand--foot .brand__name{font-size:22px}
.site-foot__tag{
  margin:0;max-width:22em;
  font-size:15px;color:var(--ink-soft);
}
.site-foot__domain{
  margin:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--sand);
}
.foot-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.foot-col__title{
  margin:0 0 14px;padding-bottom:10px;
  font-family:var(--font-mono);font-size:13px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--mist);
  border-bottom:1px solid var(--line);
}
.foot-list{display:flex;flex-direction:column;gap:9px}
.foot-list a{
  color:var(--ink-soft);text-decoration:none;font-size:15px;
  transition:color .18s, transform .18s var(--ease);
  display:inline-block;
}
.foot-list a:hover{color:var(--neon);transform:translateX(3px)}
.foot-list--plain li{
  font-size:14px;color:var(--ink-dim);line-height:1.6;
  font-variant-numeric:tabular-nums;
}
.site-foot__base{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 28px;
  margin-top:clamp(34px,5vw,60px);
  padding:22px 0 30px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;
  color:var(--mist);
}
.site-foot__base p{margin:0}

/* ---------- 9. 标签页 ---------- */
.tabs__list{
  display:flex;flex-wrap:wrap;gap:8px;
  padding:6px;border-radius:12px;
  background:rgba(10,33,72,.65);
  border:1px solid var(--line);
}
.tabs__tab{
  appearance:none;border:0;cursor:pointer;
  padding:11px 16px;border-radius:8px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.12em;
  color:var(--mist);
  transition:color .18s, background .18s;
}
.tabs__tab:hover{color:var(--paper)}
.tabs__tab[aria-selected="true"]{
  background:linear-gradient(120deg, var(--volt), var(--violet));
  color:var(--paper);
  box-shadow:0 10px 24px -16px rgba(122,60,255,.95);
}
.tabs__panel{padding-top:22px}
.tabs__panel[hidden]{display:none}

/* ---------- 10. 手风琴 ---------- */
.acc{border-top:1px solid var(--line)}
.acc__item{border-bottom:1px solid var(--line)}
.acc__btn{
  display:flex;width:100%;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 4px;text-align:left;cursor:pointer;
  font-family:var(--font-display);font-size:clamp(17px,1.8vw,20px);font-weight:700;
  color:var(--ink);
  transition:color .18s;
}
.acc__btn:hover{color:var(--neon)}
.acc__icon{
  position:relative;flex:0 0 auto;width:16px;height:16px;
}
.acc__icon::before,
.acc__icon::after{
  content:"";position:absolute;left:0;right:0;top:50%;height:2px;
  background:var(--neon);
  transform:translateY(-50%);
  transition:transform .3s var(--ease), opacity .2s;
}
.acc__icon::after{transform:translateY(-50%) rotate(90deg)}
.acc__btn[aria-expanded="true"] .acc__icon::after{transform:translateY(-50%) rotate(0deg);opacity:0}
.acc__panel{
  display:grid;grid-template-rows:0fr;
  transition:grid-template-rows .36s var(--ease);
}
.acc__btn[aria-expanded="true"] + .acc__panel{grid-template-rows:1fr}
.acc__inner{
  overflow:hidden;
  max-width:38em;
  color:var(--ink-soft);
}
.acc__inner > *{padding:0 4px}
.acc__inner > *:first-child{padding-top:2px}
.acc__inner > *:last-child{padding-bottom:24px}

/* ---------- 11. 入场与返回顶部 ---------- */
html[data-anim="on"] .reveal{
  opacity:0;
  transform:translateY(24px);
}
html[data-anim="on"] .reveal.is-in{
  opacity:1;
  transform:none;
  transition:opacity .48s var(--ease), transform .48s var(--ease);
}

.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:70;
  display:inline-flex;align-items:center;justify-content:center;
  min-width:52px;padding:12px 16px;border-radius:999px;cursor:pointer;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--paper);
  background:rgba(10,33,72,.88);
  border:1px solid var(--line-strong);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s var(--ease), transform .3s var(--ease), visibility .3s, border-color .18s, color .18s;
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--neon);color:var(--neon)}

/* ---------- 12. 平板与手机断点 ---------- */
@media (max-width:900px){
  .site-head{
    padding-block:8px;
    background:rgba(4,18,42,.86);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
  }
  .site-head[data-stuck] .site-head__bar{
    padding:8px 0;
    background:transparent;
    border-color:transparent;
    box-shadow:none;
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
  }
  .site-head__bar{gap:10px}
  .nav-toggle{display:inline-flex}

  .nav{
    position:fixed;inset:0;z-index:1;margin-left:0;
    display:block;
    padding:calc(var(--head-h) + 28px) var(--pad) 48px;
    overflow-y:auto;
    background:linear-gradient(180deg, rgba(4,18,42,.985), rgba(10,33,72,.985) 52%, rgba(4,18,42,.99));
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-14px);
    transition:opacity .3s var(--ease), transform .34s var(--ease), visibility .3s;
  }
  .nav[data-open]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__list li{border-bottom:1px solid var(--line)}
  .nav__link{
    display:block;padding:18px 4px;
    font-size:clamp(22px,7vw,30px);font-weight:900;letter-spacing:-.02em;
    color:var(--ink);
  }
  .nav__link::after{bottom:6px}

  .site-foot__inner{grid-template-columns:1fr}
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:560px){
  body{font-size:16px}
  .brand__meta{display:none}
  .brand__name{font-size:19px}
  .head-cta{padding:10px 14px;font-size:12.5px}
  .foot-cols{grid-template-columns:1fr;gap:28px}
  .site-foot__base{flex-direction:column;gap:8px}
}

@media (max-width:400px){
  .head-cta{display:none}
}

/* ---------- 13. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html[data-anim="on"] .reveal{opacity:1;transform:none}
  .nav{transform:none}
}