/* ============================================================
   pg电子官网 · 共享外壳样式 /assets/site.css
   ============================================================ */

:root{
  --ink:#0A1024;
  --deep:#122B4F;
  --paper:#F2ECE1;
  --paper-2:#DED4C4;
  --cyan:#35E8D2;
  --violet:#7B5BFF;
  --signal:#FFD24A;
  --text:#111725;
  --grey:#8C97AA;
  --organic:#1E3A3C;

  --hair:rgba(242,236,225,.12);
  --hair-strong:rgba(242,236,225,.22);
  --hair-dark:rgba(17,23,37,.14);
  --dim:rgba(242,236,225,.66);

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

  --rail:clamp(196px,15vw,236px);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:180ms;
}

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:84px;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

body.is-nav-open{overflow:hidden;}

h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;}

::selection{background:var(--cyan);color:var(--ink);}

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

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
}

.idx{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--grey);
}

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

/* ---------- skip link ---------- */

.skip-link{
  position:fixed;
  left:14px;
  top:-72px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink);
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:14px;}

/* ---------- 阅读进度 ---------- */

.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:90;
  background:rgba(242,236,225,.08);
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transform:scaleX(var(--p,0));
  transform-origin:left center;
}

/* ---------- 头部轨道 ---------- */

.rail{
  position:sticky;
  top:0;
  z-index:70;
  background:var(--ink);
  border-bottom:1px solid var(--hair);
}

.rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:12px 16px;
}

.rail__brand{
  display:flex;
  flex-direction:column;
  gap:4px;
  min-width:0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--paper);
  transition:color var(--dur) var(--ease);
}
.brand:hover{color:var(--cyan);}

.brand__mark{
  display:inline-flex;
  align-items:flex-end;
  gap:3px;
  width:20px;
  height:20px;
  flex:none;
}
.brand__mark i{
  display:block;
  width:3px;
  height:42%;
  background:var(--cyan);
}
.brand__mark i:nth-child(2){height:100%;background:var(--violet);}
.brand__mark i:nth-child(3){height:66%;background:var(--signal);}

.brand__name{
  font-family:var(--font-display);
  font-size:16px;
  font-weight:800;
  letter-spacing:.04em;
  white-space:nowrap;
}

.brand__tagline,
.brand__meta{display:none;}

.brand__tagline{
  font-size:13px;
  line-height:1.6;
  color:var(--dim);
  max-width:22ch;
}
.brand__meta{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--grey);
}

/* 抽屉开关 */

.rail__toggle{
  position:relative;
  z-index:80;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:transparent;
  border:1px solid var(--hair-strong);
  color:var(--paper);
  font-size:12px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail__toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.rail__toggle-bars{
  display:inline-flex;
  flex-direction:column;
  gap:4px;
  width:15px;
  flex:none;
}
.rail__toggle-bars i{
  display:block;
  height:1px;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.rail__toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars i:first-child{transform:translateY(2.5px) rotate(45deg);}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars i:last-child{transform:translateY(-2.5px) rotate(-45deg);}

/* 导航面板（移动端抽屉） */

.rail__nav{
  position:fixed;
  inset:0;
  z-index:75;
  display:flex;
  flex-direction:column;
  padding:92px 22px 34px;
  overflow-y:auto;
  background:var(--ink);
  background-image:
    radial-gradient(90% 60% at 100% 0%,rgba(53,232,210,.12),transparent 62%),
    radial-gradient(70% 50% at 0% 100%,rgba(123,91,255,.12),transparent 60%);
  opacity:0;
  visibility:hidden;
  transform:translateY(-12px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility 0s linear var(--dur);
}
.rail__nav[data-open]{
  opacity:1;
  visibility:visible;
  transform:none;
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility 0s;
}

.nav__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--grey);
  margin-bottom:14px;
}

.nav__list{
  display:flex;
  flex-direction:column;
}

.nav__link{
  position:relative;
  display:grid;
  grid-template-columns:42px 1fr;
  align-items:baseline;
  gap:10px;
  padding:15px 0 15px 14px;
  border-bottom:1px solid rgba(242,236,225,.08);
  text-decoration:none;
  color:var(--dim);
  font-size:19px;
  letter-spacing:.02em;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:2px;
  height:20px;
  background:var(--cyan);
  transform:translateY(-50%) scaleY(0);
  transform-origin:center top;
  transition:transform var(--dur) var(--ease);
}
.nav__link:hover,
.nav__link:focus-visible{color:var(--paper);}
.nav__link:hover::before{transform:translateY(-50%) scaleY(1);}
.nav__link[aria-current="page"]{color:var(--cyan);}
.nav__link[aria-current="page"]::before{transform:translateY(-50%) scaleY(1);}

.nav__num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--grey);
  transition:color var(--dur) var(--ease);
}
.nav__link[aria-current="page"] .nav__num{color:var(--cyan);}

.nav__foot{
  margin-top:auto;
  padding-top:22px;
  border-top:1px solid var(--hair);
}
.nav__note{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.9;
  letter-spacing:.14em;
  color:var(--grey);
}

/* ---------- 页脚 ---------- */

.foot{
  position:relative;
  margin-top:0;
  padding:56px 0 34px;
  background:var(--ink);
  background-image:radial-gradient(120% 90% at 88% 0%,rgba(53,232,210,.10),transparent 62%);
  border-top:1px solid var(--hair);
  color:var(--dim);
}

.foot__inner{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

.foot__top{
  display:grid;
  gap:42px;
}

.foot__brandline{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  letter-spacing:.04em;
  color:var(--paper);
  margin-bottom:14px;
}

.foot__summary{
  font-size:14.5px;
  line-height:1.85;
  max-width:42ch;
  color:rgba(242,236,225,.58);
}

.foot__stamp{
  margin-top:18px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--grey);
}

.foot__cols{
  display:grid;
  grid-template-columns:1fr;
  gap:30px;
}

.foot__col{min-width:0;}

.foot__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--cyan);
  margin-bottom:14px;
}

.foot__links{
  display:grid;
  gap:11px;
}

.foot__link{
  position:relative;
  display:inline-block;
  font-size:14.5px;
  color:rgba(242,236,225,.72);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.foot__link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-3px;
  width:100%;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur) var(--ease);
}
.foot__link:hover,
.foot__link:focus-visible{color:var(--cyan);}
.foot__link:hover::after,
.foot__link:focus-visible::after{transform:scaleX(1);}

.foot__meta{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
  margin-top:48px;
  padding-top:24px;
  border-top:1px solid var(--hair);
}

.foot__contact{
  font-size:13.5px;
  color:rgba(242,236,225,.7);
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:baseline;
}
.foot__contact-key{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--grey);
  flex:none;
}

.foot__legal{
  margin-top:22px;
  display:flex;
  flex-direction:column;
  gap:8px;
}

.foot__legal-line{
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--grey);
}

.foot__legal-note{
  font-size:12.5px;
  line-height:1.8;
  color:rgba(242,236,225,.42);
  max-width:64ch;
}

.foot__copy{
  margin-top:26px;
  padding-top:18px;
  border-top:1px solid var(--hair);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--grey);
}

/* ---------- 页面级可复用件 ---------- */

.shell{
  width:100%;
  max-width:1180px;
  margin-left:auto;
  margin-right:auto;
  padding-left:20px;
  padding-right:20px;
}

.prose{
  max-width:44em;
  font-size:17.5px;
  line-height:1.75;
  color:inherit;
}
.prose--narrow{max-width:32em;}
.prose p + p{margin-top:1.2em;}
.prose h2 + p,
.prose h3 + p{margin-top:.9em;}

.breadcrumb{
  font-size:12px;
  letter-spacing:.12em;
  color:var(--grey);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.breadcrumb__item{
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:rgba(140,151,170,.5);
}
.breadcrumb a{
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:rgba(242,236,225,.86);}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  border:1px solid var(--cyan);
  background:transparent;
  color:var(--cyan);
  font-size:14px;
  letter-spacing:.08em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover,
.btn:focus-visible{background:var(--cyan);color:var(--ink);}

.btn--solid{
  background:var(--cyan);
  color:var(--ink);
}
.btn--solid:hover,
.btn--solid:focus-visible{background:var(--signal);border-color:var(--signal);color:var(--ink);}

.btn--ghost{
  border-color:var(--hair-strong);
  color:var(--paper);
}
.btn--ghost:hover,
.btn--ghost:focus-visible{background:transparent;border-color:var(--violet);color:var(--paper);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border:1px solid rgba(123,91,255,.55);
  background:rgba(123,91,255,.08);
  color:#B7A6FF;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  white-space:nowrap;
}
.tag--signal{
  border-color:rgba(255,210,74,.5);
  background:rgba(255,210,74,.08);
  color:var(--signal);
}

.card{
  position:relative;
  padding:22px 24px;
  border:1px solid var(--hair);
  background:rgba(18,43,79,.42);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  left:-1px;
  top:0;
  bottom:0;
  width:3px;
  background:var(--cyan);
  transform:scaleY(0);
  transform-origin:center top;
  transition:transform var(--dur) var(--ease);
}
.card:hover,
.card:focus-within{border-color:var(--cyan);}
.card:hover::before,
.card:focus-within::before{transform:scaleY(1);}

.card--paper{
  background:var(--paper);
  border-color:var(--paper-2);
  color:var(--text);
}
.card--paper:hover,
.card--paper:focus-within{border-color:var(--violet);}
.card--paper::before{background:var(--violet);}

.media{
  position:relative;
  overflow:hidden;
  background:var(--deep);
  border:1px solid var(--hair);
}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:36%;
  background:linear-gradient(to top,rgba(10,16,36,.82),transparent);
  pointer-events:none;
}
.media--wide{aspect-ratio:16 / 9;}
.media--tall{aspect-ratio:3 / 4;}
.media--square{aspect-ratio:1 / 1;}

/* ---------- 桌面端轨道布局 ---------- */

@media (min-width:1024px){

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

  .scroll-progress{
    top:0;
    left:0;
    right:auto;
    bottom:0;
    width:2px;
    height:100%;
    background:rgba(242,236,225,.07);
  }
  .scroll-progress__bar{
    background:linear-gradient(180deg,var(--cyan),var(--violet) 68%,var(--signal));
    transform:scaleY(var(--p,0));
    transform-origin:center top;
  }

  .rail{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:var(--rail);
    border-bottom:0;
    border-right:1px solid var(--hair);
  }

  .rail__inner{
    height:100%;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    padding:42px 24px 28px 30px;
  }

  .brand__name{font-size:17px;}
  .brand__tagline,
  .brand__meta{display:block;}
  .brand__tagline{margin-top:10px;}

  .rail__toggle{display:none;}

  .rail__nav{
    position:static;
    inset:auto;
    z-index:auto;
    flex:0 0 auto;
    margin-top:auto;
    padding:0;
    overflow:visible;
    background:none;
    background-image:none;
    opacity:1;
    visibility:visible;
    transform:none;
    transition:none;
  }

  .nav__label{margin-bottom:16px;}

  .nav__list{gap:2px;}

  .nav__link{
    grid-template-columns:32px 1fr;
    gap:8px;
    padding:9px 0 9px 12px;
    border-bottom:0;
    font-size:15px;
  }

  .nav__foot{margin-top:28px;padding-top:18px;}
  .nav__note{font-size:10px;line-height:1.8;}

  .foot{padding:74px 0 40px;}
  .foot__inner{padding:0 40px;}
  .foot__top{grid-template-columns:minmax(0,1fr) minmax(0,1.55fr);gap:56px;}
  .foot__meta{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));}
  .foot__legal{margin-top:26px;}

  .shell{padding-left:40px;padding-right:40px;}
}

@media (min-width:640px){
  .foot__cols{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (min-width:768px) and (max-width:1023px){
  .rail__inner{padding:14px 24px;}
  .rail__nav{padding:104px 40px 44px;}
  .nav__link{font-size:22px;grid-template-columns:52px 1fr;padding:18px 0 18px 16px;}
  .shell{padding-left:32px;padding-right:32px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
  }
}