/* =========================================================
   老版财神到站 / assets/site.css
   装裱式页头 · 落款式页脚 · 共享排版与基础组件
   财神红 #C8322B · 鎏金 #D9A441 · 深墨绿 #173B32 · 暖米白 #F7F0E3
   ========================================================= */

:root{
  --red:#C8322B;
  --red-deep:#8E1F1B;
  --gold:#D9A441;
  --gold-deep:#B8842A;
  --gold-light:#F1D9A6;
  --ink-green:#173B32;
  --rice:#F7F0E3;
  --paper:#FFFDF7;
  --rock:#6E6A63;
  --moss:#5E7A5A;
  --clay:#B86B4B;
  --ink:#1F1B18;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --wrap:1240px;
  --gutter:clamp(16px,3vw,32px);
  --cut-sm:4px;
  --cut-lg:16px;
  --radius-panel:12px;
  --radius-panel-lg:18px;
  --line:rgba(31,27,24,.14);
  --line-light:rgba(247,240,227,.18);
  --ease:cubic-bezier(.2,.8,.2,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--rice);
  background-image:
    radial-gradient(1200px 520px at 88% -160px, rgba(217,164,65,.16), transparent 70%),
    radial-gradient(900px 480px at -120px 12%, rgba(200,50,43,.08), transparent 72%);
  background-repeat:no-repeat;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:clamp(16px,.35vw + 15px,17.5px);
  line-height:1.75;
  font-weight:400;
  min-height:100vh;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.08;
  letter-spacing:-.02em;
  margin:0 0 .5em;
  color:var(--ink-green);
}
h1{font-size:clamp(2.2rem,6vw,5.4rem);line-height:1.05}
h2{font-size:clamp(1.7rem,3.6vw,2.9rem)}
h3{font-size:clamp(1.25rem,2.2vw,1.6rem)}
h4{font-size:1.06rem;letter-spacing:0}
p{margin:0 0 1.05em;max-width:72ch}
ul,ol{margin:0 0 1.05em;padding-left:1.25em}
li{margin:.25em 0}
a{color:var(--red-deep);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--red)}
strong{font-weight:700}
small{font-size:.8rem}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit}
::selection{background:var(--gold);color:var(--ink)}
hr{border:0;height:1px;background:var(--line);margin:clamp(24px,4vw,40px) 0}

:focus-visible{
  outline:3px solid var(--red);
  outline-offset:3px;
  border-radius:2px;
}
.site-footer :focus-visible,
.site-header .header-announce :focus-visible{
  outline-color:var(--gold);
}

#main-content:focus{outline:none}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  left:clamp(12px,2vw,24px);
  top:10px;
  z-index:300;
  display:inline-block;
  padding:10px 18px;
  background:var(--ink-green);
  color:var(--rice);
  font-weight:700;
  font-size:.9rem;
  text-decoration:none;
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  border:1px solid var(--gold);
  transform:translateY(-260%);
  transition:transform .22s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);color:var(--rice)}

/* =========================================================
   页头 / 装裱边框
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(247,240,227,.97);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(217,164,65,.5), 0 18px 36px -30px rgba(23,59,50,.9);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:4px;
  background:linear-gradient(90deg,var(--red) 0 32%,var(--gold) 32% 58%,var(--ink-green) 58% 100%);
}
.header-frame{
  position:relative;
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(10px,2vw,32px);
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:18px var(--gutter) 12px;
}

/* 品牌印章 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--ink);
  min-width:0;
}
.brand-seal{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  padding-top:2px;
  background:linear-gradient(158deg,var(--red),var(--red-deep));
  color:var(--rice);
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.45rem;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
  box-shadow:inset 0 0 0 1px rgba(241,217,166,.45);
}
.brand-seal--gold{
  background:linear-gradient(158deg,var(--gold-light),var(--gold) 58%,var(--gold-deep));
  color:#2B1D0B;
  box-shadow:inset 0 0 0 1px rgba(43,29,11,.18);
}
.brand-text{display:grid;gap:2px;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.02rem,1.5vw,1.28rem);
  letter-spacing:.04em;
  line-height:1.15;
  color:var(--ink-green);
  white-space:nowrap;
}
.brand-note{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--rock);
  line-height:1.3;
  white-space:nowrap;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:var(--paper);
  color:var(--ink-green);
  border:1px solid rgba(31,27,24,.22);
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  font-size:.86rem;
  font-weight:700;
  letter-spacing:.06em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--gold);background:#fff}
.nav-toggle-box{display:grid;gap:3px;width:18px}
.nav-toggle-bar{
  display:block;
  height:2px;
  width:100%;
  background:var(--red);
  border-radius:2px;
  transition:transform .24s var(--ease),opacity .18s linear;
  transform-origin:50% 50%;
}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 主导航：横向卷轴 */
.site-nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(6px,1.2vw,18px);
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(0px,.5vw,8px);
  margin:0;
  padding:0;
  list-style:none;
  min-width:0;
}
.nav-item{margin:0}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:9px 10px 10px;
  color:var(--ink);
  font-size:.94rem;
  font-weight:500;
  text-decoration:none;
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--rock);
  transition:color .18s var(--ease);
}
.nav-label{display:inline-block}
.nav-link::after{
  content:"";
  position:absolute;
  left:10px;
  right:10px;
  bottom:2px;
  height:3px;
  background:linear-gradient(90deg,var(--red),var(--gold));
  border-radius:3px;
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--red-deep);background:rgba(217,164,65,.14)}
.nav-link:hover .nav-idx{color:var(--red)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{
  color:var(--red-deep);
  background:rgba(217,164,65,.2);
  font-weight:700;
}
.nav-link[aria-current="page"] .nav-idx{color:var(--red-deep)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:11px 18px;
  background:linear-gradient(150deg,var(--red),var(--red-deep));
  color:#fff;
  font-size:.9rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  box-shadow:0 10px 22px -14px rgba(142,31,27,.95), inset 0 0 0 1px rgba(241,217,166,.4);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease);
}
.nav-cta-arrow{font-family:var(--font-mono);font-size:.95rem;line-height:1}
.nav-cta:hover{
  color:#fff;
  background:linear-gradient(150deg,var(--red-deep),#6E1512);
  transform:translateY(-1px);
  box-shadow:0 14px 26px -14px rgba(142,31,27,1), inset 0 0 0 1px rgba(241,217,166,.55);
}
.nav-cta:active{transform:translateY(0)}
.nav-cta:focus-visible{outline-color:var(--red-deep)}

/* 公告条 */
.header-announce{
  background:var(--ink-green);
  color:var(--gold-light);
  font-size:.79rem;
  letter-spacing:.04em;
  border-top:1px solid rgba(217,164,65,.35);
}
.announce-text{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  max-width:var(--wrap);
  margin:0 auto;
  padding:7px var(--gutter);
  line-height:1.5;
}
.announce-tag{
  flex:0 0 auto;
  padding:2px 9px;
  background:var(--gold);
  color:#2B1D0B;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:700;
  letter-spacing:.14em;
  border-radius:2px 9px 2px 9px;
}

/* =========================================================
   页脚 / 落款区
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-green);
  color:rgba(247,240,227,.84);
  border-top:4px solid var(--gold);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-220px;
  right:-160px;
  width:560px;
  height:560px;
  background:
    linear-gradient(135deg,transparent 46%,rgba(217,164,65,.28) 46.6%,transparent 47.4%),
    radial-gradient(circle at 62% 38%,rgba(217,164,65,.18),transparent 64%);
  pointer-events:none;
}
.site-footer a{color:var(--gold-light)}
.site-footer a:hover{color:#fff}
.footer-inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(260px,1fr) 1.7fr;
  gap:clamp(28px,4vw,56px);
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(36px,5vw,62px) var(--gutter) clamp(24px,3vw,36px);
}
.footer-lead{display:grid;justify-items:start;gap:14px;align-content:start}
.footer-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--rice);
}
.footer-brand-text{display:grid;gap:3px}
.footer-brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.16rem;
  letter-spacing:.05em;
  color:var(--rice);
  line-height:1.2;
}
.footer-brand-note{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(241,217,166,.72);
}
.footer-contact{
  margin:0;
  max-width:44ch;
  font-size:.86rem;
  line-height:1.85;
  color:rgba(247,240,227,.78);
}
.footer-contact a{text-decoration:underline;text-decoration-color:rgba(241,217,166,.45)}
.footer-region{margin:0}
.region-badge{
  display:inline-block;
  padding:4px 11px;
  border:1px solid rgba(217,164,65,.55);
  border-radius:2px 10px 2px 10px;
  color:var(--gold-light);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  line-height:1.6;
}
.footer-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 18px;
  background:linear-gradient(150deg,var(--red),var(--red-deep));
  color:#fff !important;
  font-size:.88rem;
  font-weight:700;
  text-decoration:none;
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  box-shadow:inset 0 0 0 1px rgba(241,217,166,.42);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.footer-cta:hover{transform:translateY(-1px);box-shadow:inset 0 0 0 1px rgba(241,217,166,.7),0 12px 24px -16px #000}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 12px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(217,164,65,.34);
  font-family:var(--font-display);
  font-size:.94rem;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--gold-light);
}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-links li{margin:0}
.footer-link{
  color:rgba(247,240,227,.8);
  font-size:.88rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
  overflow-wrap:anywhere;
}
.footer-link:hover{color:#fff;border-bottom-color:var(--gold)}
.footer-base{
  position:relative;
  border-top:1px solid var(--line-light);
  background:rgba(0,0,0,.14);
}
.footer-base-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px 24px;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:16px var(--gutter) 22px;
}
.footer-copy{
  margin:0;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.05em;
  color:rgba(247,240,227,.66);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-legal li{margin:0}
.footer-legal .footer-link{font-size:.78rem}

/* =========================================================
   共享版面与基础组件
   ========================================================= */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(40px,6vw,80px)}
.section--tight{padding-block:clamp(24px,3.4vw,44px)}

.rule{border:0;height:1px;background:var(--line);margin:clamp(20px,3vw,34px) 0}
.rule--gold{background:linear-gradient(90deg,var(--gold),rgba(217,164,65,0))}
.rule--dashed{height:0;border-top:1px dashed rgba(31,27,24,.22);background:none}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.26em;
  color:var(--rock);
}
.eyebrow::before{
  content:"";
  width:30px;
  height:2px;
  background:linear-gradient(90deg,var(--red),var(--gold));
  flex:0 0 auto;
}

.seal-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  background:rgba(200,50,43,.1);
  border:1px solid rgba(200,50,43,.34);
  border-radius:2px 10px 2px 10px;
  color:var(--red-deep);
  font-family:var(--font-mono);
  font-size:.74rem;
  font-weight:700;
  letter-spacing:.1em;
  line-height:1.6;
}
.seal-tag--moss{background:rgba(94,122,90,.12);border-color:rgba(94,122,90,.4);color:#3E563B}
.seal-tag--clay{background:rgba(184,107,75,.14);border-color:rgba(184,107,75,.45);color:#8A4A2F}

.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em;font-variant-numeric:tabular-nums}

.note-vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  margin:0;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.3em;
  color:var(--rock);
  line-height:1.4;
  max-height:22rem;
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(14px,2vw,28px);
  align-items:start;
}

/* 切角面板：可承载交互内容 */
.panel-cut{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-panel) var(--radius-panel-lg) var(--radius-panel) var(--radius-panel-lg);
  padding:clamp(16px,2.6vw,28px);
  box-shadow:0 18px 40px -34px rgba(23,59,50,.9);
}
.panel-cut::before{
  content:"";
  position:absolute;
  inset:0 0 auto auto;
  width:34px;
  height:34px;
  background:linear-gradient(135deg,rgba(217,164,65,.42),rgba(217,164,65,0));
  border-top-right-radius:var(--radius-panel-lg);
  pointer-events:none;
}
.panel-cut--ink{
  background:var(--ink-green);
  color:rgba(247,240,227,.88);
  border-color:rgba(217,164,65,.32);
}
.panel-cut--ink h2,.panel-cut--ink h3{color:var(--gold-light)}

/* 硬切角面板：仅装饰或纯图文 */
.panel-clip{
  position:relative;
  padding:clamp(16px,2.6vw,28px);
  background:linear-gradient(160deg,var(--paper),#FBF4E6);
  clip-path:polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

/* 响应式图片容器 */
.media-frame{
  position:relative;
  display:grid;
  place-items:center;
  width:100%;
  aspect-ratio:4 / 3;
  overflow:hidden;
  border:1px solid rgba(31,27,24,.14);
  border-radius:var(--radius-panel) var(--radius-panel-lg) var(--radius-panel) var(--radius-panel-lg);
  background:
    linear-gradient(135deg,rgba(200,50,43,.14),rgba(217,164,65,.22) 48%,rgba(23,59,50,.16)),
    var(--rice);
}
.media-frame > img,
.media-frame > picture,
.media-frame > svg{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__hint{
  margin:0;
  padding:0 18px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.16em;
  color:rgba(31,27,24,.5);
}
.media-frame__caption{
  position:absolute;
  inset:auto 0 0 0;
  margin:0;
  padding:12px 16px;
  background:linear-gradient(180deg,rgba(23,59,50,0),rgba(23,59,50,.86));
  color:var(--rice);
  font-size:.78rem;
  letter-spacing:.04em;
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  font-family:var(--font-body);
  font-size:.94rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),box-shadow .2s var(--ease),color .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{
  background:linear-gradient(150deg,var(--red),var(--red-deep));
  color:#fff;
  box-shadow:inset 0 0 0 1px rgba(241,217,166,.4);
}
.btn--primary:hover{color:#fff;background:linear-gradient(150deg,var(--red-deep),#6E1512)}
.btn--gold{
  background:linear-gradient(150deg,var(--gold-light),var(--gold) 55%,var(--gold-deep));
  color:#2B1D0B;
  box-shadow:inset 0 0 0 1px rgba(43,29,11,.18);
}
.btn--gold:hover{color:#2B1D0B}
.btn--ghost{
  background:transparent;
  border-color:rgba(31,27,24,.28);
  color:var(--ink-green);
}
.btn--ghost:hover{background:rgba(217,164,65,.16);border-color:var(--gold);color:var(--ink-green)}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  margin:0 0 clamp(18px,2.4vw,26px);
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:var(--rock);
}
.breadcrumb li{display:inline-flex;align-items:center;margin:0}
.breadcrumb li + li::before{
  content:"／";
  margin:0 8px;
  color:var(--gold);
}
.breadcrumb a{color:var(--rock);text-decoration:none}
.breadcrumb a:hover{color:var(--red-deep);text-decoration:underline}
.breadcrumb [aria-current="page"]{color:var(--ink-green);font-weight:700}

/* 章节目录 */
.toc{
  position:sticky;
  top:132px;
  padding-left:16px;
  border-left:2px solid rgba(200,50,43,.28);
}
.toc-title{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.24em;
  color:var(--rock);
}
.toc-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.toc-list li{margin:0}
.toc-link{
  display:block;
  padding:6px 8px;
  color:var(--rock);
  font-size:.86rem;
  text-decoration:none;
  border-radius:2px 8px 2px 8px;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.toc-link:hover{color:var(--red-deep);background:rgba(217,164,65,.16)}
.toc-link[data-active="true"]{
  color:var(--red-deep);
  font-weight:700;
  background:rgba(217,164,65,.22);
}

/* 滚动进度与返回顶部 */
.scroll-meter{
  position:fixed;
  inset:0 0 auto 0;
  height:3px;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--gold) 62%,var(--ink-green));
  z-index:200;
  pointer-events:none;
}
.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:150;
  display:grid;
  place-items:center;
  width:48px;
  height:48px;
  padding:0 0 2px;
  background:linear-gradient(150deg,var(--red),var(--red-deep));
  color:var(--rice);
  border:1px solid rgba(241,217,166,.5);
  border-radius:var(--cut-sm) var(--cut-lg) var(--cut-sm) var(--cut-lg);
  font-family:var(--font-mono);
  font-size:1.12rem;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  box-shadow:0 16px 30px -18px rgba(23,59,50,.95);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:linear-gradient(150deg,var(--red-deep),#6E1512)}

/* 滚动显现 */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1080px){
  .footer-inner{grid-template-columns:1fr;gap:clamp(26px,4vw,40px)}
  .footer-nav{grid-template-columns:repeat(4,minmax(0,1fr))}
  .toc{position:static;border-left:0;border-top:2px solid rgba(200,50,43,.24);padding:12px 0 0}
}

@media (max-width:900px){
  .header-frame{grid-template-columns:1fr auto;gap:12px;padding-top:18px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    inset:100% 0 auto 0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    max-height:calc(100vh - 96px);
    overflow-y:auto;
    padding:10px var(--gutter) 20px;
    background:var(--rice);
    border-bottom:3px solid var(--gold);
    box-shadow:0 26px 44px -30px rgba(23,59,50,.85);
  }
  .site-header[data-open] .site-nav{
    display:flex;
    animation:nav-drop .28s var(--ease) both;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:13px 10px;
    font-size:1rem;
    border-bottom:1px solid rgba(31,27,24,.09);
    border-radius:0;
  }
  .nav-link::after{left:10px;right:auto;width:34px;bottom:6px}
  .nav-cta{justify-content:center;margin-top:16px;padding:14px 18px;font-size:.95rem}
  .announce-text{font-size:.75rem}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .note-vertical{
    writing-mode:horizontal-tb;
    letter-spacing:.18em;
    max-height:none;
  }
}

@keyframes nav-drop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:translateY(0)}
}

@media (max-width:760px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}

@media (max-width:600px){
  .brand-seal{width:40px;height:40px;font-size:1.2rem}
  .brand-name{font-size:1rem}
  .brand-note{font-size:9px;letter-spacing:.12em}
  .nav-toggle-text{display:none}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-base-inner{flex-direction:column;align-items:flex-start}
  .media-frame{aspect-ratio:3 / 2}
}

@media (max-width:420px){
  .footer-nav{grid-template-columns:1fr}
}

@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;
  }
  [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}