/* ============================================================
   威利斯人棋牌 · 共享样式 /assets/site.css
   堆叠面板 / 居中刊头 / 经幡五色 / 切角与斜线
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --ink-900:#0E1230;
  --ink-800:#1A2050;
  --ink-700:#2C3470;
  --ink-600:#3E4890;

  --red-600:#D7263D;
  --red-700:#9E1B31;
  --red-300:#FF6E7F;

  --teal-600:#17A398;
  --teal-300:#6FD3C7;

  --gold-500:#F2B233;
  --gold-100:#FBEBC4;

  --paper:#F5F1E6;
  --mist:#9AA2C8;

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --shell:1200px;
  --cut:18px;
  --cut-sm:10px;

  --cut-tr:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  --cut-lg:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px);

  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-panel:0 18px 40px -28px rgba(0,0,0,.9);
}

/* ---------- 2. 重置与底纹 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:132px;
}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  color:var(--paper);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(58% 42% at 8% -6%, rgba(215,38,61,.22), transparent 72%),
    radial-gradient(52% 40% at 94% 2%, rgba(23,163,152,.18), transparent 72%),
    radial-gradient(72% 52% at 50% 114%, rgba(242,178,51,.13), transparent 72%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:radial-gradient(rgba(245,241,230,.06) 1px,transparent 1px);
  background-size:5px 5px;
  opacity:.5;
}
img,svg{display:block;max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--teal-300);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--gold-500)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--teal-300);outline-offset:3px}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.28;
  letter-spacing:.01em;
  color:var(--paper);
  margin:0 0 .5em;
  text-wrap:balance;
}
h1{font-size:clamp(32px,5vw,56px);letter-spacing:.02em}
h2{font-size:clamp(24px,3vw,40px)}
h3{font-size:clamp(19px,2.2vw,28px)}
h4{font-size:18px}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
strong,b{font-weight:700}
.hl{color:var(--gold-500);font-weight:700}
.hl-mark{background:var(--gold-100);color:var(--ink-900);padding:0 5px;font-weight:700;box-decoration-break:clone}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.24em;
  color:var(--teal-300);
  margin:0 0 12px;
}
.kicker::before{
  content:"";
  width:22px;height:2px;
  background:linear-gradient(90deg,var(--red-600),var(--gold-500));
}
.prose{max-width:820px}
.prose h2{margin:42px 0 14px;font-size:clamp(22px,2.6vw,30px)}
.prose h3{margin:30px 0 10px}
.prose p{margin:0 0 1.2em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.5em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--gold-500)}
.prose strong{color:var(--gold-500)}
.prose blockquote{
  margin:26px 0;
  padding:14px 20px;
  border-left:3px solid var(--teal-600);
  background:var(--ink-800);
  color:var(--mist);
}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* ---------- 4. 容器 / 网格 / 章节 ---------- */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 22px}
.container--narrow{max-width:820px}
.section{padding:56px 0}
.section__head{max-width:760px;margin-bottom:28px}
.section__title{margin:0 0 10px}
.section__lede{color:var(--mist);font-size:16px;margin:0}
.grid{display:grid;gap:22px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.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-12{grid-column:span 12}

/* ---------- 5. 分隔与装饰 ---------- */
.flag-stripe{
  position:relative;
  height:6px;
  width:100%;
  overflow:hidden;
  background-image:linear-gradient(90deg,
    var(--teal-600) 0 20%,
    var(--paper) 20% 40%,
    var(--red-600) 40% 60%,
    var(--gold-500) 60% 80%,
    var(--ink-600) 80% 100%);
}
.flag-stripe::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(115deg,rgba(14,18,48,.45) 0 5px,transparent 5px 13px);
}
.flag-stripe--footer{height:9px}
.trail{
  position:relative;
  height:16px;
  width:100%;
  overflow:hidden;
}
.trail::before{
  content:"";
  position:absolute;
  inset:-2px -30px;
  background-image:repeating-linear-gradient(115deg,rgba(44,52,112,.95) 0 2px,transparent 2px 18px);
  animation:trail-drift 9s ease-in-out infinite alternate;
}
@keyframes trail-drift{from{transform:translateX(-16px)}to{transform:translateX(16px)}}
.ornament{
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    radial-gradient(circle at 50% 50%,transparent 0 37%,rgba(242,178,51,.09) 37% 38%,transparent 38% 49%,rgba(215,38,61,.08) 49% 50%,transparent 50% 61%,rgba(23,163,152,.07) 61% 62%,transparent 62%);
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.05em;
  line-height:1.4;
  color:var(--paper);
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  clip-path:var(--cut-tr);
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{color:var(--paper);border-color:var(--teal-600);background:var(--ink-700);transform:translateY(-2px)}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ink-900),0 0 0 5px var(--teal-300)}
.btn--red{background:var(--red-600);border-color:var(--red-600);color:#fff}
.btn--red:hover{background:var(--red-700);border-color:var(--red-700);color:#fff}
.btn--gold{background:transparent;border-color:var(--gold-500);color:var(--gold-500)}
.btn--gold:hover{background:var(--gold-500);color:var(--ink-900)}
.btn--ghost{background:transparent;border-color:var(--ink-700);color:var(--mist)}
.btn--ghost:hover{color:var(--paper);border-color:var(--teal-300)}
.btn--block{display:flex;width:100%}

/* ---------- 7. 标签 / 徽章 / 指标 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--teal-300);
  background:rgba(23,163,152,.14);
  border:1px solid rgba(23,163,152,.45);
  clip-path:var(--cut-tr);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.tag:hover{background:rgba(111,211,199,.24);color:var(--paper)}
.tag--gold{color:var(--gold-500);background:rgba(242,178,51,.12);border-color:rgba(242,178,51,.45)}
.tag--gold:hover{background:rgba(242,178,51,.22);color:var(--gold-100)}
.tag--red{color:var(--red-300);background:rgba(215,38,61,.16);border-color:rgba(215,38,61,.5)}
.tag--red:hover{background:rgba(215,38,61,.3);color:#fff}

.seal{
  position:relative;
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:2px;
  width:96px;height:96px;
  border-radius:50%;
  background:radial-gradient(circle at 50% 32%,rgba(242,178,51,.18),transparent 62%),var(--ink-800);
  border:2px solid var(--gold-500);
  box-shadow:0 0 0 4px rgba(242,178,51,.12) inset,var(--shadow-panel);
  text-align:center;
  transition:box-shadow .3s var(--ease),transform .3s var(--ease);
}
.seal:hover{transform:translateY(-3px);box-shadow:0 0 0 6px rgba(242,178,51,.22) inset,var(--shadow-panel)}
.seal__num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:26px;font-weight:700;color:var(--gold-500);line-height:1}
.seal__label{font-size:12px;letter-spacing:.12em;color:var(--mist)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.4vw,38px);
  font-weight:700;
  line-height:1.1;
  color:var(--gold-500);
}
.stat__label{font-size:14px;color:var(--mist);letter-spacing:.06em}

/* ---------- 8. 堆叠面板 ---------- */
.panel{
  position:relative;
  width:100%;
  padding:30px;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  clip-path:var(--cut-lg);
  box-shadow:var(--shadow-panel);
}
.panel--wide{width:100%}
.panel--mid{width:88%}
.panel--narrow{width:72%}
.panel--right{margin-left:auto}
.panel--alt{background:linear-gradient(160deg,rgba(23,163,152,.16),rgba(26,32,80,.96) 58%),var(--ink-800)}
.panel--red{background:linear-gradient(160deg,rgba(215,38,61,.28),rgba(26,32,80,.96) 60%),var(--ink-800)}
.panel__head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:16px}
.panel__index{
  flex:none;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  font-weight:700;
  color:var(--ink-900);
  background:var(--gold-500);
  padding:3px 9px;
  clip-path:var(--cut-tr);
}
.panel__title{margin:0;font-size:clamp(21px,2.6vw,30px)}
.panel__body{color:var(--paper)}
.panel__body p{color:var(--paper)}
.panel__note{color:var(--mist);font-size:15px}

/* ---------- 9. 折叠组 ---------- */
.disclosure{
  margin-bottom:10px;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  clip-path:var(--cut-tr);
  overflow:hidden;
}
.disclosure__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  width:100%;
  padding:15px 18px;
  font-weight:700;
  font-size:16px;
  color:var(--paper);
  text-align:left;
  border-left:3px solid transparent;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.disclosure__trigger:hover{background:rgba(44,52,112,.5);color:var(--gold-500)}
.disclosure__trigger[aria-expanded="true"]{
  color:var(--teal-300);
  border-left-color:var(--teal-600);
  background:rgba(23,163,152,.1);
}
.disclosure__trigger::after{
  content:"+";
  flex:none;
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--gold-500);
  transition:transform .25s var(--ease);
}
.disclosure__trigger[aria-expanded="true"]::after{content:"–";transform:rotate(180deg)}
.disclosure__body{
  padding:4px 18px 18px;
  border-left:3px solid var(--teal-600);
  color:var(--mist);
  font-size:15px;
}
.disclosure__body[hidden]{display:none}

/* ---------- 10. 图文容器 ---------- */
.media{
  position:relative;
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  clip-path:var(--cut-lg);
  aspect-ratio:4 / 3;
}
.media > img,.media > svg{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16 / 9}
.media--1x1{aspect-ratio:1 / 1}
.media--3x4{aspect-ratio:3 / 4}
.media--framed::after{
  content:"";
  position:absolute;
  inset:9px;
  border:1px solid rgba(242,178,51,.5);
  pointer-events:none;
}
.media__caption{
  margin-top:8px;
  font-size:14px;
  color:var(--mist);
  line-height:1.6;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs{max-width:var(--shell);margin:0 auto;padding:18px 22px 0;font-size:13px}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs__item{display:flex;align-items:center;gap:8px;color:var(--mist)}
.breadcrumbs__item + .breadcrumbs__item::before{content:"／";color:var(--ink-600)}
.breadcrumbs__link{color:var(--mist)}
.breadcrumbs__link:hover{color:var(--gold-500)}
.breadcrumbs__item[aria-current="page"]{color:var(--gold-500)}

/* ---------- 12. 页头（居中刊头） ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg,rgba(14,18,48,.98),rgba(14,18,48,.92));
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--ink-700);
}
.scroll-progress{
  position:absolute;
  top:0;left:0;
  z-index:5;
  width:0;
  height:3px;
  background:linear-gradient(90deg,var(--red-600),var(--gold-500) 55%,var(--teal-600));
}
.skip-link{
  position:absolute;
  left:18px;
  top:-70px;
  z-index:80;
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  color:var(--ink-900);
  background:var(--gold-500);
  clip-path:var(--cut-tr);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px;color:var(--ink-900)}

.topbar{
  background:var(--ink-800);
  border-bottom:1px solid var(--ink-700);
}
.topbar__inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:7px 22px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--mist);
}
.topbar__note{margin:0;display:flex;align-items:center;gap:9px;letter-spacing:.02em}
.topbar__note::before{
  content:"";
  flex:none;
  width:9px;height:9px;
  background:var(--red-600);
  clip-path:polygon(3px 0,100% 0,100% calc(100% - 3px),calc(100% - 3px) 100%,0 100%,0 3px);
}
.topbar__meta{margin:0;display:flex;align-items:center;gap:8px;color:var(--teal-300)}
.topbar__dot{
  width:7px;height:7px;
  background:var(--teal-600);
  border-radius:50%;
  box-shadow:0 0 0 3px rgba(23,163,152,.22);
}

.masthead{position:relative;overflow:hidden}
.masthead::before{
  content:"";
  position:absolute;
  left:50%;top:50%;
  width:540px;height:540px;
  transform:translate(-50%,-50%);
  border-radius:50%;
  pointer-events:none;
  background:radial-gradient(circle,transparent 0 51%,rgba(242,178,51,.08) 51% 52%,transparent 52% 63%,rgba(215,38,61,.07) 63% 64%,transparent 64%);
}
.masthead__inner{
  position:relative;
  max-width:var(--shell);
  margin:0 auto;
  padding:22px 22px 16px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  text-align:center;
}
.masthead__brand{display:inline-flex;flex-direction:column;align-items:center;gap:6px;color:var(--paper)}
.masthead__brand:hover{color:var(--paper)}
.masthead__name{
  position:relative;
  display:inline-block;
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(28px,4.6vw,46px);
  letter-spacing:.09em;
  line-height:1.15;
  color:var(--paper);
  text-shadow:0 2px 0 rgba(215,38,61,.4);
  transition:font-size .3s var(--ease);
}
.masthead__name::after{
  content:"";
  position:absolute;
  left:4%;right:4%;bottom:-7px;
  height:3px;
  background:linear-gradient(90deg,transparent,var(--gold-500) 18%,var(--red-600) 50%,var(--teal-600) 82%,transparent);
}
.masthead__tagline{
  font-size:13px;
  letter-spacing:.32em;
  color:var(--mist);
  transition:opacity .25s var(--ease);
}
.masthead__actions{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:10px;
  margin-top:6px;
}

.nav-shell{
  position:relative;
  border-top:1px solid var(--ink-700);
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin:10px auto;
  padding:9px 16px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--paper);
  background:var(--ink-800);
  border:1px solid var(--ink-700);
  clip-path:var(--cut-tr);
}
.nav-toggle:hover{color:var(--gold-500);border-color:var(--gold-500)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;height:12px;
  background-image:linear-gradient(var(--paper),var(--paper));
  background-size:18px 2px;
  background-position:0 0;
  background-repeat:no-repeat;
  transition:background-size .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;
  background:var(--paper);
  transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:5px}
.nav-toggle__bars::after{top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background-size:0 2px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:2px;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 14px;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:13px 17px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:17px;right:17px;bottom:7px;
  height:2px;
  background:var(--gold-500);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s var(--ease),background .25s var(--ease);
}
.site-nav__link:hover{color:var(--paper)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--gold-500)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--red-600)}

.site-header[data-scrolled] .topbar{display:none}
.site-header[data-scrolled] .masthead__inner{padding:12px 22px 10px;gap:10px}
.site-header[data-scrolled] .masthead__name{font-size:clamp(22px,3vw,30px)}
.site-header[data-scrolled] .masthead__tagline{opacity:0;height:0;overflow:hidden}
.site-header[data-scrolled] .masthead__actions{margin-top:0}
.site-header[data-scrolled] .site-nav__link{padding:10px 16px}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:76px;
  background:linear-gradient(180deg,var(--ink-800),var(--ink-900) 82%);
  color:var(--mist);
}
.footer__inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:46px 22px 24px;
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:34px 26px;
}
.footer__name{
  margin:0 0 8px;
  font-family:var(--font-head);
  font-size:24px;
  font-weight:900;
  letter-spacing:.08em;
  color:var(--paper);
}
.footer__tagline{margin:0 0 14px;font-size:15px;line-height:1.8;color:var(--mist);max-width:34em}
.footer__badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.footer__since{margin:0;font-size:13px;color:var(--ink-600);color:var(--mist);opacity:.85}
.footer__title{
  margin:0 0 12px;
  font-family:var(--font-body);
  font-size:13px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--gold-500);
}
.footer__links{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;
  font-size:15px;
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),padding-left .2s var(--ease);
}
.footer__link:hover{color:var(--paper);border-color:var(--teal-600);padding-left:4px}
.footer__meta{
  border-top:1px solid var(--ink-700);
  background:rgba(14,18,48,.65);
}
.footer__meta-inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:18px 22px 26px;
  display:flex;
  flex-direction:column;
  gap:6px;
  font-size:13px;
}
.footer__contact{margin:0;color:var(--mist)}
.footer__contact--sub{color:var(--mist);opacity:.85}
.footer__legal{
  margin:6px 0 0;
  padding-top:10px;
  border-top:1px solid var(--ink-700);
  color:var(--mist);
  letter-spacing:.04em;
}

/* ---------- 14. 显现协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
}
[data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-4,.col-5,.col-7,.col-8,.col-6{grid-column:span 6}
  .footer__inner{grid-template-columns:1.4fr 1fr 1fr}
}
@media (max-width:900px){
  html{scroll-padding-top:150px}
  .panel{padding:24px}
  .panel--mid,.panel--narrow{width:100%}
}
@media (max-width:860px){
  .nav-shell{padding-bottom:4px}
  .nav-toggle{display:inline-flex}
  .site-nav{display:none;padding:0 16px 14px}
  .site-nav[data-open]{display:block;animation:nav-in .28s var(--ease) both}
  .site-nav__list{flex-direction:column;align-items:stretch;padding:0;gap:0}
  .site-nav__item{border-bottom:1px solid rgba(44,52,112,.7)}
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__link{padding:13px 14px;border-left:3px solid transparent}
  .site-nav__link::after{display:none}
  .site-nav__link:hover{background:rgba(44,52,112,.45)}
  .site-nav__link[aria-current="page"]{
    border-left-color:var(--red-600);
    background:rgba(215,38,61,.12);
  }
  .site-header[data-scrolled] .site-nav__link{padding:13px 14px}
  .masthead::before{width:360px;height:360px}
  .footer__inner{grid-template-columns:1fr 1fr;padding-top:36px}
  .footer__brand{grid-column:1 / -1}
}
@keyframes nav-in{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media (max-width:680px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .grid--12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 4}
  .section{padding:40px 0}
  .panel{padding:20px;clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px)}
  .masthead__tagline{letter-spacing:.22em}
  .masthead__actions .btn{flex:1 1 auto}
  .topbar__inner{justify-content:center;text-align:center}
  .footer__inner{grid-template-columns:1fr;gap:26px}
  .footer__meta-inner{padding-bottom:30px}
  .breadcrumbs{padding-top:14px}
}

/* ---------- 16. 动效偏好 ---------- */
@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}
  .trail::before{animation:none}
}