/* ==========================================================================
   7南宮中心 — 共享样式 /assets/site.css
   母题：南宫数据殿 · 夜靛蓝底 + 暖金线 + 朱砂点缀 + 青瓷状态
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root{
  --ink:#0B1730;          /* 夜靛蓝 */
  --ink-2:#16264F;        /* 深殿蓝 */
  --gold:#D9A544;         /* 暖金 */
  --gold-soft:#F2DFA8;    /* 淡金光 */
  --cinnabar:#C0392B;     /* 朱砂红 */
  --celadon:#3E7C6B;      /* 青瓷绿 */
  --moon:#F5F2EA;         /* 月白 */
  --cloud:#6C7A99;        /* 云灰蓝 */
  --ink-black:#14161C;    /* 墨砚黑 */
  --mountain:#4A6FA5;     /* 远山青 */
  --silver:#EFE6D2;       /* 浅金银 */

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

  --header-h:76px;
  --header-h-scrolled:64px;

  --radius:3px;
  --line-gold:rgba(217,165,68,.32);
  --line-gold-strong:rgba(217,165,68,.6);
  --line-cool:rgba(108,122,153,.32);
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:200ms;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0}
main{display:block}
#main-content{scroll-margin-top:96px}

/* ---------- 基础排版 ---------- */
body{
  background:var(--moon);
  color:var(--ink-black);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{font-family:var(--font-serif);font-weight:800;line-height:1.18;letter-spacing:-.01em}
h1{font-size:clamp(2.5rem,6vw,4.5rem)}
h2{font-size:clamp(1.5rem,3vw,2.125rem)}
h3{font-size:clamp(1.125rem,2vw,1.375rem)}
strong{font-weight:700}
small{font-size:.8125rem}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:0}
::selection{background:rgba(217,165,68,.35);color:var(--ink)}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.skip-link{
  position:fixed;left:16px;top:-80px;z-index:300;
  padding:10px 18px;background:var(--gold);color:#1B1405;
  font-size:14px;font-weight:600;border-radius:var(--radius);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 容器与分区 ---------- */
.container{width:min(1200px,92vw);margin-inline:auto}
.container--wide{width:min(1320px,94vw)}
.container--narrow{width:min(760px,92vw);margin-inline:auto}
.section{padding:clamp(44px,7vw,96px) 0}
.section--tight{padding:clamp(28px,4vw,52px) 0}

.zone-dark{background:var(--ink);color:var(--moon)}
.zone-moon{background:var(--moon);color:var(--ink-black)}
.zone-silver{background:var(--silver);color:var(--ink-black)}
.zone-deep{background:var(--ink-2);color:var(--moon)}

/* ---------- 页头 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  height:var(--header-h);
  background:linear-gradient(180deg,rgba(11,23,48,.92) 0%,rgba(11,23,48,.48) 62%,rgba(11,23,48,0) 100%);
  transition:height var(--dur) var(--ease),background-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header[data-scrolled]{
  height:var(--header-h-scrolled);
  background:var(--ink);
  box-shadow:0 1px 0 rgba(217,165,68,.4),0 14px 34px -18px rgba(3,8,20,.85);
}
.header-inner{
  display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);
  width:min(1320px,94vw);height:100%;margin-inline:auto;
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;color:var(--moon)}
.brand-mark{position:relative;width:34px;height:34px;flex:0 0 auto}
.brand-mark::before{
  content:"";position:absolute;left:0;right:0;top:9px;height:1.5px;
  background:linear-gradient(90deg,rgba(217,165,68,0),var(--gold) 14%,var(--gold) 86%,rgba(217,165,68,0));
  transform:scaleX(0);transform-origin:center;
  transition:transform 320ms var(--ease);
}
.brand:hover .brand-mark::before,
.brand:focus-visible .brand-mark::before{transform:scaleX(1)}
.brand-mark::after{
  content:"";position:absolute;left:8px;right:8px;top:15px;bottom:5px;
  border:1px solid rgba(217,165,68,.5);border-top:0;
  background:linear-gradient(90deg,rgba(217,165,68,.32) 0 1px,transparent 1px calc(100% - 1px),rgba(217,165,68,.32) calc(100% - 1px));
}
.brand-text{display:flex;flex-direction:column;line-height:1.06}
.brand-name{font-family:var(--font-serif);font-size:19px;font-weight:800;letter-spacing:.05em;color:var(--moon)}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:rgba(242,223,168,.6)}

/* 导航（移动端默认为全屏抽屉） */
.site-nav{
  position:fixed;left:0;right:0;top:var(--header-h-scrolled);bottom:0;z-index:-1;
  display:flex;flex-direction:column;
  padding:24px clamp(20px,6vw,44px) 40px;
  overflow-y:auto;
  background:linear-gradient(180deg,rgba(11,23,48,.99),rgba(11,23,48,1));
  border-top:1px solid rgba(217,165,68,.28);
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity 200ms var(--ease),transform 240ms var(--ease),visibility 200ms;
}
.site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-link{
  position:relative;display:block;padding:14px 2px;
  font-family:var(--font-serif);font-size:19px;font-weight:700;letter-spacing:.02em;
  color:var(--moon);border-bottom:1px solid rgba(217,165,68,.14);
  transition:color 180ms var(--ease),padding-left 200ms var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:-1px;width:0;height:2px;background:var(--gold);
  transition:width 220ms var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--gold-soft);padding-left:10px}
.nav-link:hover::after,.nav-link:focus-visible::after{width:34px}
.nav-link[aria-current="page"]{color:var(--gold-soft)}
.nav-link[aria-current="page"]::after{width:100%}
.nav-foot{
  margin-top:32px;padding-top:20px;border-top:1px solid rgba(217,165,68,.16);
  font-size:13px;line-height:1.9;color:rgba(245,242,234,.62);
}
.nav-foot-link{
  display:inline-flex;align-items:center;margin-top:14px;padding:9px 18px;
  border:1px solid var(--line-gold-strong);border-radius:var(--radius);
  font-size:14px;color:var(--gold-soft);
  transition:background-color 180ms var(--ease),border-color 180ms var(--ease);
}
.nav-foot-link:hover{background:rgba(217,165,68,.14);border-color:var(--gold)}

/* 页头右侧信息 */
.header-meta{display:flex;align-items:center;gap:12px;margin-left:auto;flex:0 0 auto}
.version-badge{
  display:inline-flex;align-items:center;gap:7px;padding:5px 11px;
  border:1px solid rgba(217,165,68,.45);border-radius:999px;
  font-family:var(--font-mono);font-size:12px;color:var(--gold-soft);
  white-space:nowrap;
}
.version-dot{
  width:6px;height:6px;border-radius:50%;background:var(--cinnabar);
  box-shadow:0 0 0 3px rgba(192,57,43,.22);
}
.header-phone{display:none;font-family:var(--font-mono);font-size:13px;color:rgba(245,242,234,.78);white-space:nowrap}

/* 抽屉按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;flex:0 0 auto;
  padding:8px 11px;border:1px solid rgba(217,165,68,.45);border-radius:var(--radius);
  color:var(--gold-soft);font-size:13px;letter-spacing:.1em;cursor:pointer;
  transition:border-color 180ms var(--ease),background-color 180ms var(--ease);
}
.nav-toggle:hover{background:rgba(217,165,68,.12);border-color:var(--gold)}
.nav-toggle-box{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle-box span{display:block;height:1.5px;background:currentColor;transition:transform 200ms var(--ease),opacity 160ms var(--ease)}
.site-header[data-open] .nav-toggle-box span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-box span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-box span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.nav-toggle-label{display:none}

html[data-nav-open]{overflow:hidden}

/* ---------- 桌面端头部 ---------- */
@media (min-width:920px){
  .site-nav{
    position:static;z-index:auto;flex:1 1 auto;
    flex-direction:row;align-items:center;justify-content:center;
    padding:0;overflow:visible;border:0;background:none;
    opacity:1;visibility:visible;transform:none;transition:none;
  }
  .nav-list{flex-direction:row;align-items:center;gap:clamp(8px,1.8vw,28px)}
  .nav-link{
    padding:8px 2px;font-family:var(--font-sans);font-size:15px;font-weight:500;
    letter-spacing:.02em;color:rgba(245,242,234,.82);border-bottom:0;
    transition:color 180ms var(--ease);
  }
  .nav-link::after{
    left:0;right:0;bottom:0;width:auto;height:2px;
    transform:scaleX(0);transform-origin:left;
    transition:transform 220ms var(--ease);
  }
  .nav-link:hover,.nav-link:focus-visible{padding-left:2px;color:var(--moon)}
  .nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1);width:auto}
  .nav-link[aria-current="page"]{color:var(--gold-soft)}
  .nav-link[aria-current="page"]::after{transform:scaleX(1);width:auto}
  .nav-foot,.nav-foot-link{display:none}
  .nav-toggle{display:none}
  .header-phone{display:inline}
  .nav-toggle-label{display:inline}
}
@media (min-width:920px) and (max-width:1099px){
  .header-phone{display:none}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);color:rgba(245,242,234,.78);
  padding:clamp(44px,6vw,76px) 0 30px;
  border-top:1px solid rgba(217,165,68,.28);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:7px;
  background-image:repeating-linear-gradient(90deg,rgba(217,165,68,.45) 0 1px,transparent 1px 22px);
  pointer-events:none;
}
.footer-grid{display:grid;gap:clamp(28px,4vw,52px);grid-template-columns:1fr}
.footer-col{min-width:0}
.footer-col--brand{padding-top:4px}
.footer-brand{
  font-family:var(--font-serif);font-size:20px;font-weight:800;letter-spacing:.05em;
  color:var(--moon);margin-bottom:12px;
}
.footer-brand-sep{color:var(--gold);margin-inline:.35em}
.footer-note{font-size:14px;line-height:1.8;color:rgba(245,242,234,.66);max-width:34ch}
.footer-legal{
  margin-top:18px;padding-top:14px;border-top:1px solid rgba(217,165,68,.2);
  font-size:12px;letter-spacing:.04em;color:rgba(108,122,153,.95);
}
.footer-legal .mono{color:var(--gold-soft)}
.footer-title{
  font-family:var(--font-sans);font-size:12px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;
  color:rgba(242,223,168,.72);margin-bottom:16px;
}
.footer-links{display:flex;flex-direction:column;gap:11px}
.footer-links li{position:relative}
.footer-links a{
  position:relative;display:inline-block;padding-left:0;
  font-size:14px;color:rgba(245,242,234,.8);
  transition:color 180ms var(--ease),padding-left 200ms var(--ease);
}
.footer-links a::before{
  content:"";position:absolute;left:0;top:50%;width:0;height:1px;background:var(--gold);
  transition:width 200ms var(--ease);
}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--gold-soft);padding-left:14px}
.footer-links a:hover::before,.footer-links a:focus-visible::before{width:9px}
.footer-links--tight{margin-bottom:24px}

.footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact li{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;line-height:1.7;color:rgba(245,242,234,.78);
}
.footer-label{
  flex:0 0 auto;padding:2px 8px;border:1px solid rgba(217,165,68,.32);border-radius:999px;
  font-size:11px;letter-spacing:.1em;color:var(--gold-soft);
}
.footer-contact .mono{color:var(--moon);font-size:13px}
.copy-btn{
  padding:2px 10px;border:1px solid rgba(217,165,68,.4);border-radius:999px;
  font-size:11px;letter-spacing:.08em;color:var(--gold-soft);cursor:pointer;
  transition:background-color 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease);
}
.copy-btn:hover{background:rgba(217,165,68,.16);border-color:var(--gold);color:var(--moon)}
.footer-closing{
  margin-top:22px;padding-top:14px;border-top:1px solid rgba(217,165,68,.16);
  font-size:12px;color:rgba(108,122,153,.95);letter-spacing:.03em;
}
@media (min-width:760px){
  .footer-grid{grid-template-columns:1.3fr 1fr 1.1fr}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 22px;border-radius:var(--radius);
  border:1px solid transparent;
  font-family:var(--font-sans);font-size:15px;font-weight:500;letter-spacing:.04em;
  cursor:pointer;white-space:nowrap;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease),box-shadow 200ms var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--gold{background:var(--gold);color:#1B1405;border-color:var(--gold)}
.btn--gold:hover{background:var(--gold-soft);box-shadow:0 12px 26px -16px rgba(217,165,68,.9)}
.btn--ghost{border-color:var(--line-gold-strong);color:var(--gold-soft);background:transparent}
.btn--ghost:hover{background:rgba(217,165,68,.14);border-color:var(--gold);box-shadow:0 0 0 6px rgba(217,165,68,.08)}
.btn--dark{background:var(--ink-2);color:var(--moon);border-color:rgba(217,165,68,.35)}
.btn--dark:hover{background:var(--ink)}
.btn--quiet{border-color:rgba(22,38,79,.28);color:var(--ink-2);background:transparent}
.btn--quiet:hover{border-color:var(--ink-2);background:rgba(74,111,165,.1)}
.btn--sm{min-height:38px;padding:0 16px;font-size:14px}

/* ---------- 标签与徽章 ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  border:1px solid rgba(217,165,68,.42);
  background:rgba(217,165,68,.08);
  font-size:12px;letter-spacing:.08em;color:var(--gold-soft);
}
.chip--status{border-color:rgba(62,124,107,.55);background:rgba(62,124,107,.16);color:#8FCFBB}
.chip--alert{border-color:rgba(192,57,43,.55);background:rgba(192,57,43,.16);color:#E9907F}
.chip--light{border-color:rgba(22,38,79,.22);background:rgba(22,38,79,.05);color:var(--ink-2)}
.chip--num{font-family:var(--font-mono);letter-spacing:0}

/* ---------- 面板 ---------- */
.panel{
  background:var(--ink-2);color:var(--moon);
  border:1px solid rgba(217,165,68,.22);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
}
.panel--light{background:#fff;color:var(--ink-black);border-color:rgba(22,38,79,.12)}
.panel--moon{background:var(--silver);color:var(--ink-black);border-color:rgba(22,38,79,.1)}
.panel--accent{
  border-color:rgba(217,165,68,.55);
  box-shadow:0 0 0 1px rgba(217,165,68,.1),0 22px 46px -30px rgba(11,23,48,.85);
}
.panel-title{font-size:1.0625rem;margin-bottom:8px}
.panel-body{font-size:14px;line-height:1.75;color:rgba(245,242,234,.72)}
.panel--light .panel-body,.panel--moon .panel-body{color:rgba(20,22,28,.72)}

/* ---------- 章节抬头 ---------- */
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:12px 28px;margin-bottom:clamp(20px,3vw,38px);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cloud);margin-bottom:10px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--gold);flex:0 0 auto}
.zone-dark .eyebrow{color:rgba(242,223,168,.72)}
.section-title{font-size:clamp(1.5rem,3vw,2.125rem)}
.section-desc{max-width:52ch;font-size:15px;line-height:1.8;color:var(--cloud)}
.zone-dark .section-desc{color:rgba(245,242,234,.68)}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:14px 0 0;font-size:13px;color:var(--cloud)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:0}
.breadcrumb-list li{display:flex;align-items:center}
.breadcrumb-list li+li::before{content:"／";margin:0 8px;color:rgba(217,165,68,.6)}
.breadcrumb a{color:var(--mountain);transition:color 180ms var(--ease)}
.breadcrumb a:hover{color:var(--cinnabar);text-decoration:underline;text-underline-offset:3px}
.breadcrumb [aria-current="page"]{color:var(--ink-black)}

/* ---------- 正文容器 ---------- */
.prose{max-width:68ch;font-size:16px;line-height:1.75}
.prose>*+*{margin-top:1em}
.prose h2{margin-top:2em;margin-bottom:.55em;font-size:1.5rem;line-height:1.3}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:1.15rem;line-height:1.35}
.prose ul,.prose ol{margin-top:.9em;padding-left:1.35em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin:.42em 0;line-height:1.65}
.prose li::marker{color:var(--gold)}
.prose a{color:var(--mountain);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--cinnabar)}
.prose blockquote{
  margin:1.4em 0;padding:14px 20px;border-left:2px solid var(--gold);
  background:rgba(217,165,68,.07);color:rgba(20,22,28,.8);
}
.zone-dark .prose{color:rgba(245,242,234,.85)}
.zone-dark .prose a{color:var(--gold-soft)}
.zone-dark .prose li::marker{color:var(--gold)}

/* ---------- 栅格骨架 ---------- */
.grid-split{display:grid;gap:clamp(20px,3vw,48px);grid-template-columns:1fr}
.grid-2{display:grid;gap:clamp(16px,2.4vw,28px);grid-template-columns:1fr}
.grid-3{display:grid;gap:clamp(16px,2.2vw,24px);grid-template-columns:1fr}
@media (min-width:640px){
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:760px){
  .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:920px){
  .grid-split{grid-template-columns:5fr 7fr}
  .grid-split--4-8{grid-template-columns:4fr 8fr}
  .grid-split--7-5{grid-template-columns:7fr 5fr}
  .grid-split--even{grid-template-columns:1fr 1fr}
}

/* ---------- 框景与刻度 ---------- */
.tick-frame{
  position:relative;
  border:1px solid var(--line-gold);
  padding:clamp(20px,3vw,42px);
}
.tick-frame::before,.tick-frame::after{
  content:"";position:absolute;width:13px;height:13px;border:1px solid var(--gold);
  pointer-events:none;
}
.tick-frame::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.tick-frame::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.tick-frame--dark{background:rgba(11,23,48,.55)}

.tick-rule{
  height:6px;border-top:1px solid rgba(217,165,68,.22);
  background-image:repeating-linear-gradient(90deg,rgba(217,165,68,.42) 0 1px,transparent 1px 20px);
}

.flow-line{
  position:relative;height:1px;margin:clamp(24px,4vw,52px) 0;
  background:linear-gradient(90deg,rgba(217,165,68,0),rgba(217,165,68,.55),rgba(217,165,68,0));
}
.flow-line::after{
  content:"";position:absolute;top:-3px;left:0;width:7px;height:7px;border-radius:50%;
  background:var(--gold-soft);box-shadow:0 0 12px rgba(217,165,68,.85);
  animation:flow-travel 7s linear infinite;
}
@keyframes flow-travel{
  0%{left:0;opacity:0}
  12%{opacity:1}
  88%{opacity:1}
  100%{left:calc(100% - 7px);opacity:0}
}

.slant-divider{
  height:1px;margin:clamp(28px,5vw,64px) 0;
  background:linear-gradient(90deg,transparent,rgba(217,165,68,.5),transparent);
  transform:rotate(-1.2deg);transform-origin:left center;
}

/* ---------- 图片容器基类 ---------- */
.img-frame{
  position:relative;display:block;overflow:hidden;border-radius:2px;
  border:1px solid rgba(217,165,68,.25);
  background:linear-gradient(160deg,var(--ink-2) 0%,var(--ink) 72%);
}
.img-frame>*{display:block;width:100%;height:100%;object-fit:cover}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,23,48,0) 42%,rgba(11,23,48,.5) 100%);
}
.img-frame--16-9{aspect-ratio:16/9}
.img-frame--4-3{aspect-ratio:4/3}
.img-frame--1-1{aspect-ratio:1/1}
.img-frame--3-4{aspect-ratio:3/4}
.img-frame--21-9{aspect-ratio:21/9}
.img-frame--free{aspect-ratio:auto}
.img-frame--ph{
  background-color:var(--ink-2);
  background-image:
    repeating-linear-gradient(135deg,rgba(217,165,68,.14) 0 1px,transparent 1px 12px),
    linear-gradient(160deg,var(--ink-2),var(--ink));
}
.img-frame--tick::before{
  content:"";position:absolute;inset:9px;z-index:2;pointer-events:none;
  border:1px solid rgba(217,165,68,.35);
  clip-path:polygon(0 0,34px 0,34px 1px,1px 1px,1px 34px,0 34px,0 100%,0 100%,0 calc(100% - 34px),1px calc(100% - 34px),1px calc(100% - 1px),34px calc(100% - 1px),34px 100%,100% 100%,100% calc(100% - 34px),calc(100% - 1px) calc(100% - 34px),calc(100% - 1px) calc(100% - 1px),calc(100% - 34px) calc(100% - 1px),calc(100% - 34px) 100%,0 100%);
}
.img-frame__tag{
  position:absolute;left:12px;bottom:12px;z-index:3;
  padding:4px 10px;border-radius:999px;
  border:1px solid rgba(217,165,68,.5);background:rgba(11,23,48,.72);
  font-size:11px;letter-spacing:.1em;color:var(--gold-soft);
}

/* ---------- 显现 ---------- */
html.js-reveal [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
}
html.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 全局进度与提示 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:2px;z-index:120;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--gold-soft) 58%,var(--cinnabar));
  pointer-events:none;
}
.toast{
  position:fixed;left:50%;bottom:28px;z-index:220;
  max-width:min(92vw,440px);padding:11px 20px;
  background:rgba(11,23,48,.97);color:var(--gold-soft);
  border:1px solid rgba(217,165,68,.55);border-radius:var(--radius);
  font-family:var(--font-sans);font-size:13px;line-height:1.6;
  opacity:0;visibility:hidden;transform:translate(-50%,16px);
  transition:opacity 200ms var(--ease),transform 220ms var(--ease),visibility 200ms;
}
.toast[data-visible]{opacity:1;visibility:visible;transform:translate(-50%,0)}

/* ---------- 小屏适配 ---------- */
@media (max-width:519px){
  .version-badge{display:none}
  .nav-toggle-label{display:none}
  .header-inner{gap:10px}
  .brand-sub{display:none}
}
@media (min-width:520px){
  .nav-toggle-label{display:inline}
}
@media (max-width:759px){
  .breadcrumb{padding-top:10px}
  .tick-frame{padding:20px 18px}
}

/* ---------- 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;
  }
  .flow-line::after{left:calc(50% - 3px);opacity:.85;animation:none}
  html.js-reveal [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}