/* ==========================================================================
   TPG游艺 · 共享站点样式 /assets/site.css
   夜间机房导航屏：深海蓝网格底 + 电子青路径 + 珊瑚橙入口提示
   ========================================================================== */

:root{
  --sea:#0B1F33;
  --indigo:#12293D;
  --graphite:#1B2A38;
  --grid-line:#22394D;
  --cyan:#35E0D0;
  --cyan-mist:#7FF0E4;
  --coral:#FF7A59;
  --old:#6B7C8C;
  --white:#F2F6F7;
  --amber:#FFB454;

  --cyan-06:rgba(53,224,208,.06);
  --cyan-08:rgba(53,224,208,.08);
  --cyan-18:rgba(53,224,208,.18);
  --old-12:rgba(107,124,140,.12);
  --old-35:rgba(107,124,140,.35);
  --amber-10:rgba(255,180,84,.10);
  --amber-30:rgba(255,180,84,.30);

  --font-head:"Barlow Condensed","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --wrap:1240px;
  --z-header:60;
  --radius-tag:2px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
img,svg,video{display:block;max-width:100%;}
hr{border:0;}

/* ---------- 基底：网格坐标底 ---------- */
body{
  min-height:100%;
  font-family:var(--font-body);
  font-size:clamp(1rem,.95rem + .2vw,1.06rem);
  font-weight:400;
  line-height:1.75;
  color:var(--white);
  background-color:var(--sea);
  background-image:
    linear-gradient(rgba(34,57,77,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,57,77,.55) 1px,transparent 1px);
  background-size:72px 72px;
  background-position:-1px -1px;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:1.1;letter-spacing:-.01em;color:var(--white);}
h1{font-size:clamp(2.4rem,5.5vw,4.6rem);}
h2{font-size:clamp(1.7rem,3vw,2.6rem);}
h3{font-size:clamp(1.2rem,1.6vw,1.55rem);line-height:1.25;}
h4{font-size:1.05rem;line-height:1.4;letter-spacing:0;}
p{max-width:72ch;}

::selection{background:var(--cyan);color:#08202A;}
:focus-visible{outline:2px solid var(--cyan-mist);outline-offset:3px;}

/* ---------- 排版工具 ---------- */
.mono{font-family:var(--font-mono);letter-spacing:.06em;}
.num{font-family:var(--font-mono);font-weight:700;color:var(--cyan);letter-spacing:.02em;}
.lead{max-width:62ch;font-size:clamp(1.02rem,1.4vw,1.2rem);line-height:1.85;color:rgba(242,246,247,.82);}
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;
  letter-spacing:.22em;color:var(--cyan);text-transform:uppercase;
}
.eyebrow::before{content:"";width:1.6rem;height:1px;background:var(--cyan);}
.hairline{height:1px;background:var(--grid-line);}

/* ---------- 容器与分区 ---------- */
.wrap{width:min(var(--wrap),100% - 2rem);margin-inline:auto;}
.section{position:relative;padding-block:clamp(2.6rem,6vw,5rem);}
.section--indigo{background:var(--indigo);border-block:1px solid var(--grid-line);}
.section--graphite{background:var(--graphite);border-block:1px solid var(--grid-line);}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:.75rem 1.5rem;margin-bottom:clamp(1.4rem,3vw,2.4rem);
  padding-bottom:1rem;border-bottom:1px solid var(--grid-line);
}

/* ---------- 面包屑 ---------- */
.crumbs{margin:0 0 clamp(1.2rem,3vw,2rem);font-family:var(--font-mono);font-size:.76rem;letter-spacing:.08em;color:var(--old);}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;}
.crumbs li{display:flex;align-items:center;gap:.5rem;}
.crumbs li + li::before{content:"›";color:var(--old);opacity:.7;}
.crumbs a:hover{color:var(--cyan-mist);}
.crumbs [aria-current="page"]{color:var(--white);}

/* ---------- 栅格 ---------- */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(.9rem,1.8vw,1.6rem);}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-9{grid-column:span 9;}
.col-12{grid-column:span 12;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.55rem .95rem;font-family:var(--font-head);font-weight:600;
  font-size:.92rem;letter-spacing:.06em;line-height:1;
  border:1px solid var(--grid-line);background:transparent;color:var(--white);
  transition:transform .18s ease,border-color .18s ease,color .18s ease,background-color .18s ease;
}
.btn:hover{transform:translateY(-2px);border-color:var(--cyan);color:var(--cyan-mist);background:var(--cyan-06);}
.btn:active{transform:translateY(0);}
.btn-ghost{background:rgba(27,42,56,.55);}
.btn-primary{background:var(--coral);border-color:var(--coral);color:#12202B;font-weight:700;}
.btn-primary:hover{background:var(--amber);border-color:var(--amber);color:#12202B;}
.btn-route__mark{font-size:.7em;color:var(--coral);line-height:1;}

/* ---------- 标签与徽标 ---------- */
.version-badge{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.28rem .5rem;font-family:var(--font-mono);font-weight:700;
  font-size:.78rem;letter-spacing:.1em;color:var(--cyan);
  background:var(--cyan-08);border:1px solid var(--cyan-18);
  border-radius:var(--radius-tag);white-space:nowrap;
}
.version-badge::before{content:"";width:.4rem;height:.4rem;background:var(--cyan);box-shadow:0 0 0 3px rgba(53,224,208,.14);}
.tag{
  display:inline-flex;align-items:center;padding:.22rem .5rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;
  color:var(--cyan);background:var(--cyan-08);border:1px solid var(--cyan-18);
  border-radius:var(--radius-tag);
}
.tag--old{color:var(--old);background:var(--old-12);border-color:var(--old-35);}
.tag--warn{color:var(--amber);background:var(--amber-10);border-color:var(--amber-30);}

/* ---------- 卡片 ---------- */
.card{
  position:relative;background:var(--graphite);border:1px solid var(--grid-line);
  padding:clamp(1.1rem,2.2vw,1.7rem);
  transition:transform .18s ease,border-color .18s ease,background-color .18s ease;
}
.card:hover{transform:translateY(-2px);border-color:var(--cyan);}
.card--entry{
  background:linear-gradient(160deg,var(--cyan-08),transparent 62%),var(--graphite);
  border-color:var(--cyan-18);
}
.card--entry::before{content:"";position:absolute;left:0;top:0;width:2.5rem;height:2px;background:var(--cyan);}
.card--old{border-color:var(--old-35);background:rgba(27,42,56,.55);}

/* ---------- 路径步骤 ---------- */
.steps{display:flex;flex-direction:column;border-left:1px solid var(--grid-line);}
.step{position:relative;padding:0 0 1.15rem 1.3rem;}
.step:last-child{padding-bottom:0;}
.step::before{
  content:"";position:absolute;left:-4.5px;top:.55em;width:8px;height:8px;
  background:var(--sea);border:1px solid var(--cyan);
}
.step__label{
  display:block;margin-bottom:.2rem;font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.16em;color:var(--cyan);text-transform:uppercase;
}

/* ---------- 图像容器基础（页面阶段放置截图/示意图） ---------- */
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  background:var(--graphite);border:1px solid var(--grid-line);aspect-ratio:16 / 10;
}
.media-frame img,.media-frame svg,.media-frame video{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame--empty{
  background-image:repeating-linear-gradient(135deg,rgba(53,224,208,.05) 0 2px,transparent 2px 10px);
}
.media-frame--empty::after{
  content:attr(data-label);position:absolute;left:0;bottom:0;
  padding:.5rem .65rem;background:rgba(11,31,51,.82);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;color:var(--old);
}
.media-frame--ticks::before{
  content:"";position:absolute;inset:.5rem;border:1px solid rgba(53,224,208,.16);
  pointer-events:none;
}
.media-caption{
  margin-top:.7rem;font-family:var(--font-mono);font-size:.74rem;
  letter-spacing:.06em;line-height:1.7;color:var(--old);
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s ease,transform .5s ease;
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ==========================================================================
   头部：居中刊头导航
   ========================================================================== */
.skip-link{
  position:fixed;top:.5rem;left:.5rem;z-index:200;
  padding:.6rem 1rem;background:var(--cyan);color:#08202A;
  font-family:var(--font-head);font-weight:700;font-size:.95rem;letter-spacing:.06em;
  transform:translateY(-180%);transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0);}

.site-header{
  position:sticky;top:0;z-index:var(--z-header);
  background:rgba(11,31,51,.94);
  border-bottom:1px solid var(--grid-line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-header__inner{
  position:relative;
  width:min(var(--wrap),100% - 2rem);
  margin-inline:auto;
  padding:.55rem 0 .25rem;
}
.masthead-top{
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;gap:.6rem 1rem;min-height:58px;
}
.masthead-left{justify-self:start;min-width:0;}
.masthead-right{justify-self:end;display:flex;align-items:center;gap:.55rem;min-width:0;}

.brand{
  justify-self:center;display:flex;flex-direction:column;align-items:center;
  gap:.15rem;padding:.15rem .75rem;text-align:center;
}
.brand-name{
  display:inline-flex;align-items:center;
  font-family:var(--font-head);font-weight:700;
  font-size:clamp(1.35rem,2.6vw,2.05rem);letter-spacing:.1em;line-height:1;
  color:var(--white);transition:color .18s ease;
}
.brand-name::before{
  content:"";display:inline-block;width:.42em;height:.42em;
  margin-right:.34em;background:var(--cyan);
}
.brand-sub{
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.24em;
  color:var(--old);text-transform:uppercase;
}
.brand:hover .brand-name{color:var(--cyan-mist);}
.brand:hover .brand-sub{color:var(--cyan);}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;
  padding:.5rem .7rem;border:1px solid var(--grid-line);
  background:rgba(27,42,56,.7);color:var(--white);
  font-family:var(--font-head);font-size:.9rem;letter-spacing:.08em;line-height:1;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan-mist);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars span{display:block;height:1px;background:currentColor;transition:transform .2s ease,opacity .2s ease;}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(4px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-4px) rotate(-45deg);}
.nav-toggle__text{white-space:nowrap;}

.masthead-nav{margin-top:.35rem;border-top:1px solid var(--grid-line);}
.nav-list{display:flex;justify-content:center;flex-wrap:wrap;}
.nav-list li + li{border-left:1px solid var(--grid-line);}
.nav-list a{
  display:inline-flex;align-items:baseline;gap:.45rem;
  padding:.62rem .95rem;border-bottom:2px solid transparent;
  font-family:var(--font-head);font-weight:600;font-size:.98rem;
  letter-spacing:.08em;color:rgba(242,246,247,.76);
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.nav-list a:hover{color:var(--cyan-mist);border-bottom-color:var(--cyan);background:var(--cyan-06);}
.nav-list a[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan);}
.nav-index{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.06em;
  color:var(--old);transition:color .18s ease;
}
.nav-list a:hover .nav-index,
.nav-list a[aria-current="page"] .nav-index{color:var(--cyan-mist);}

.header-progress{
  position:absolute;left:0;bottom:-1px;display:block;width:100%;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-mist));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;pointer-events:none;
}

/* ==========================================================================
   页脚：路线图例
   ========================================================================== */
.site-footer{
  position:relative;
  background:var(--indigo);
  border-top:1px solid var(--grid-line);
}
.site-footer::before{
  content:"";position:absolute;left:0;top:-1px;width:96px;height:2px;background:var(--cyan);
}
.site-footer__inner{
  width:min(var(--wrap),100% - 2rem);margin-inline:auto;
  padding:clamp(2.2rem,4vw,3.5rem) 0 clamp(1.2rem,2vw,2rem);
}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,2fr);
  gap:clamp(1.5rem,4vw,3.5rem);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:.7rem;}
.footer-brand__mark{
  font-family:var(--font-head);font-weight:700;font-size:1.6rem;
  letter-spacing:.12em;color:var(--white);transition:color .18s ease;
}
.footer-brand__mark:hover{color:var(--cyan-mist);}
.footer-brand__line{max-width:34ch;font-size:.95rem;line-height:1.8;color:rgba(242,246,247,.7);}
.footer-brand__meta{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--old);
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.25rem;}
.footer-col__title{
  position:relative;margin-bottom:.85rem;padding-left:.85rem;
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;
  letter-spacing:.18em;color:var(--cyan);
}
.footer-col__title::before{
  content:"";position:absolute;left:0;top:.42em;width:.4rem;height:.4rem;background:var(--cyan);
}
.footer-col ul{display:flex;flex-direction:column;gap:.5rem;}
.footer-col a{
  display:inline-block;font-size:.94rem;
  color:rgba(242,246,247,.72);border-bottom:1px solid transparent;
  transition:color .16s ease,padding-left .16s ease,border-color .16s ease;
}
.footer-col a:hover{color:var(--cyan-mist);padding-left:.5rem;border-bottom-color:var(--cyan-18);}
.footer-col a[aria-current="page"]{color:var(--cyan);}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:.9rem 1.5rem;margin-top:clamp(1.75rem,3vw,2.75rem);
  padding-top:1.25rem;border-top:1px solid var(--grid-line);
}
.footer-legal{
  display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;
  font-family:var(--font-mono);font-size:.76rem;line-height:1.8;
  letter-spacing:.04em;color:var(--old);
}
.footer-legal__icp{color:var(--cyan);}
.footer-copy{margin:0;font-family:var(--font-mono);font-size:.76rem;color:var(--old);}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .footer-top{grid-template-columns:1fr;gap:2rem;}
}
@media (max-width:960px){
  .col-5,.col-7,.col-8,.col-9{grid-column:span 12;}
  .col-3,.col-4{grid-column:span 6;}
}
@media (max-width:820px){
  .masthead-top{min-height:52px;}
  .brand-sub{display:none;}
  .nav-toggle{display:inline-flex;}
  .masthead-nav{
    position:absolute;left:0;right:0;top:100%;z-index:5;margin:0;
    max-height:0;overflow:hidden;background:var(--indigo);
    border-top:0;border-bottom:1px solid var(--grid-line);
    box-shadow:0 18px 32px rgba(3,10,18,.55);
    transition:max-height .3s ease;
  }
  .site-header[data-open="true"] .masthead-nav{
    max-height:26rem;border-top:1px solid var(--grid-line);
  }
  .nav-list{flex-direction:column;padding:.25rem 0;}
  .nav-list li + li{border-left:0;border-top:1px solid var(--grid-line);}
  .nav-list a{
    width:100%;padding:.85rem 1.1rem;border-bottom:0;
    border-left:2px solid transparent;
  }
  .nav-list a:hover{border-left-color:var(--cyan);}
  .nav-list a[aria-current="page"]{border-left-color:var(--cyan);background:var(--cyan-06);}
}
@media (max-width:640px){
  .col-3,.col-4,.col-6{grid-column:span 12;}
  .footer-cols{grid-template-columns:1fr;gap:1.5rem;}
}
@media (max-width:560px){
  .site-header__inner{padding-top:.45rem;}
  .btn-route{padding:.48rem .65rem;font-size:.82rem;}
  .btn-route__mark{display:none;}
  .version-badge{font-size:.72rem;padding:.24rem .42rem;}
  .nav-toggle__text{display:none;}
  .nav-toggle{padding:.5rem .6rem;}
  .brand-name{font-size:1.2rem;letter-spacing:.06em;}
}

/* ==========================================================================
   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;
  }
  [data-reveal]{opacity:1;transform:none;}
  .card:hover,.btn:hover{transform:none;}
}