/* =========================================================
   易博服务 · 共享样式 /assets/site.css
   墨黑 · 瓷白 · 朱红 · 铜绿 —— 极细边界与展签式结构
   ========================================================= */

/* ---------- tokens ---------- */
:root{
  --ink-900:#12100E;
  --ink-800:#1C1917;
  --ink-600:#3A3632;
  --ink-400:#6B655E;
  --line-300:#D9D3C8;
  --porcelain-50:#F7F4EF;
  --porcelain-100:#EFEAE2;
  --vermilion-500:#B7352A;
  --vermilion-100:#F6E2DE;
  --bronze-600:#2E6B5E;
  --bronze-100:#DCE9E4;

  --hair-dark:rgba(255,255,255,.12);
  --on-ink-1:rgba(247,244,239,.92);
  --on-ink-2:rgba(247,244,239,.66);
  --on-ink-3:rgba(247,244,239,.45);
  --mint-soft:rgba(220,233,228,.78);

  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",Georgia,serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1280px;
  --pad:24px;
  --bar-h:64px;

  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:240ms;

  --shadow-1:0 1px 2px rgba(18,16,14,.06);
  --shadow-2:0 18px 40px rgba(0,0,0,.34);
}

/* ---------- 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{list-style:none;padding:0}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--vermilion-500);outline-offset:2px}

/* ---------- base typography ---------- */
body{
  background:var(--porcelain-50);
  color:var(--ink-900);
  font-family:var(--sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:900;line-height:1.15;letter-spacing:-.01em}
p{text-wrap:pretty}
strong{font-weight:500}
.mono{font-family:var(--mono);font-size:.94em;letter-spacing:.04em}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(48px,7vw,96px)}
.sec-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:16px;
  border-top:1px solid var(--line-300);
  padding-top:16px;margin-bottom:clamp(24px,3vw,40px);
}
.sec-title{font-size:clamp(26px,3.2vw,40px)}
.display{font-size:clamp(40px,7vw,92px);line-height:1.05;letter-spacing:-.02em}
.lead{font-size:clamp(16px,1.35vw,19px);line-height:1.7;color:var(--ink-600);max-width:52ch}
.prose{max-width:68ch;font-size:17px;line-height:1.75}
.prose p + p{margin-top:1.2em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.6em;font-size:clamp(20px,2vw,26px)}
.prose a{color:var(--bronze-600);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--vermilion-500)}
.prose ul,.prose ol{margin:1em 0;padding-left:1.1em;list-style:disc}
.prose li + li{margin-top:.4em}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--pad)}

/* ---------- bento ---------- */
.bento{
  display:grid;gap:1px;
  background:var(--line-300);
  border:1px solid var(--line-300);
  border-radius:2px;
  overflow:hidden;
}
.bento__cell{
  background:var(--porcelain-50);
  padding:clamp(18px,2.2vw,28px);
  display:flex;flex-direction:column;gap:12px;min-height:120px;
}
.bento__cell--ink{background:var(--ink-900);color:var(--on-ink-1)}
.bento__cell--tint{background:var(--porcelain-100)}
.bento__cell--bronze{background:var(--bronze-100)}

/* ---------- stamp label ---------- */
.stamp{
  display:flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.18em;color:var(--ink-400);
}
.stamp__no{font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--bronze-600)}
.stamp--on-ink{color:var(--on-ink-2)}
.stamp--on-ink .stamp__no{color:var(--mint-soft)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;font-size:14px;letter-spacing:.06em;
  border:1px solid var(--ink-900);border-radius:2px;background:transparent;color:var(--ink-900);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover{background:var(--ink-900);color:var(--porcelain-50)}
.btn--primary{background:var(--vermilion-500);border-color:var(--vermilion-500);color:#fff}
.btn--primary:hover{background:#9C2C23;border-color:#9C2C23;color:#fff}
.btn--ghost{border-color:var(--line-300);color:var(--ink-600)}
.btn--ghost:hover{border-color:var(--ink-900);background:transparent;color:var(--ink-900)}
.btn--sm{padding:8px 14px;font-size:12.5px}

/* ---------- breadcrumbs ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.1em;color:var(--ink-400);
}
.crumbs a{color:var(--ink-600);transition:color var(--dur) var(--ease)}
.crumbs a:hover{color:var(--vermilion-500)}
.crumbs__sep{color:var(--ink-400)}
.crumbs [aria-current="page"]{color:var(--ink-900)}

/* ---------- media container ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  background:var(--porcelain-100);
  border:1px solid var(--line-300);border-radius:2px;
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.02)}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(18,16,14,.05),rgba(18,16,14,.16));
  box-shadow:inset 0 0 0 1px rgba(18,16,14,.06);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x4{aspect-ratio:3/4}
.media--1x1{aspect-ratio:1/1}
.media__tag{
  position:absolute;left:12px;top:12px;z-index:2;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  background:rgba(18,16,14,.82);color:var(--porcelain-50);
  padding:4px 9px;border-radius:2px;
}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:16px;font-size:12.5px;letter-spacing:.06em;color:var(--porcelain-50);
  background:linear-gradient(180deg,rgba(18,16,14,0),rgba(18,16,14,.8));
}

/* ---------- small pieces ---------- */
.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--ink-400);flex:0 0 auto}
.status-dot--bronze{background:var(--bronze-600)}
.status-dot--vermilion{background:var(--vermilion-500)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;font-size:11px;letter-spacing:.12em;
  border:1px solid var(--line-300);border-radius:2px;
  color:var(--ink-600);background:var(--porcelain-50);
}
.tag--bronze{border-color:var(--bronze-600);color:var(--bronze-600)}

.note{
  padding:14px 16px;border:1px solid var(--line-300);border-left:2px solid var(--bronze-600);
  border-radius:2px;background:var(--porcelain-100);
  font-size:14.5px;line-height:1.7;color:var(--ink-600);
}
.note--error{background:var(--vermilion-100);border-color:var(--vermilion-500);border-left-color:var(--vermilion-500);color:var(--ink-800)}
.note--info{background:var(--bronze-100);border-left-color:var(--bronze-600);color:var(--ink-800)}

.copy-btn{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;
  padding:4px 9px;border:1px solid var(--line-300);border-radius:2px;color:var(--ink-600);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.copy-btn:hover{border-color:var(--vermilion-500);color:var(--vermilion-500)}
.copy-btn[data-copied="true"]{border-color:var(--bronze-600);background:var(--bronze-100);color:var(--bronze-600)}

/* ---------- accordion ---------- */
.acc{border-top:1px solid var(--line-300)}
.acc:last-child{border-bottom:1px solid var(--line-300)}
.acc__trigger{
  width:100%;display:flex;align-items:flex-start;gap:12px;
  padding:18px 0;text-align:left;font-size:16px;font-weight:500;line-height:1.6;
  color:var(--ink-900);transition:color var(--dur) var(--ease);
}
.acc__trigger:hover{color:var(--vermilion-500)}
.acc__mark{
  position:relative;flex:0 0 auto;width:18px;height:18px;margin-top:3px;
  border:1px solid var(--line-300);border-radius:2px;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.acc__mark::before,.acc__mark::after{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--ink-600);transition:opacity var(--dur) var(--ease)
}
.acc__mark::before{width:8px;height:1px}
.acc__mark::after{width:1px;height:8px}
.acc__trigger[aria-expanded="true"] .acc__mark{border-color:var(--bronze-600);background:var(--bronze-100)}
.acc__trigger[aria-expanded="true"] .acc__mark::after{opacity:0}
.acc__panel{
  padding:0 0 20px 30px;max-width:68ch;
  font-size:15.5px;line-height:1.75;color:var(--ink-600);
}
.acc__panel[hidden]{display:none}
.acc__panel:not([hidden]){animation:accIn var(--dur) var(--ease)}
@keyframes accIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  padding:10px 14px;border:1px solid var(--ink-900);border-radius:2px;
  background:var(--porcelain-50);color:var(--ink-900);
  font-size:13px;letter-spacing:.08em;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- header : command bar ---------- */
.cmd-bar{
  position:sticky;top:0;z-index:80;
  background:var(--ink-900);color:var(--porcelain-50);
  border-bottom:1px solid var(--hair-dark);
}
.cmd-bar__inner{
  max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad);
  min-height:var(--bar-h);display:flex;align-items:center;gap:20px;
}
.brand{display:flex;flex-direction:column;justify-content:center;flex:0 0 auto;padding-block:10px}
.brand__mark{font-family:var(--serif);font-weight:900;font-size:19px;letter-spacing:.06em;color:var(--porcelain-50)}
.brand__sub{font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--on-ink-3);margin-top:3px}

.nav{flex:1 1 auto;display:flex;justify-content:center}
.nav__list{display:flex;align-items:center;gap:2px}
.nav__item{position:relative}
.nav__link{
  position:relative;display:inline-block;padding:10px 12px;
  font-size:13.5px;letter-spacing:.08em;color:var(--on-ink-2);
  transition:color var(--dur) var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:1px;
  background:var(--vermilion-500);transform:scaleX(0);transform-origin:left;
  transition:transform var(--dur) var(--ease);
}
.nav__link:hover{color:var(--porcelain-50)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--porcelain-50)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__foot{display:none}

.cmd-tools{display:flex;align-items:center;gap:8px;flex:0 0 auto;margin-left:auto}
.cmd-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 14px;font-size:12.5px;letter-spacing:.1em;
  color:var(--porcelain-50);background:transparent;
  border:1px solid var(--hair-dark);border-radius:2px;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.cmd-btn:hover{border-color:rgba(255,255,255,.34);background:rgba(255,255,255,.05)}
.cmd-btn--search{color:var(--on-ink-2)}
.cmd-btn--search:hover{color:var(--porcelain-50)}
.cmd-btn--channel[aria-expanded="true"]{border-color:var(--vermilion-500);color:#fff}
.cmd-btn__short{display:none}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 12px;font-size:12.5px;letter-spacing:.1em;
  color:var(--porcelain-50);border:1px solid var(--hair-dark);border-radius:2px;
  transition:border-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:rgba(255,255,255,.34)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:1px;background:currentColor}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1px;background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.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)}
.nav-toggle__text{white-space:nowrap}

.channel-panel{
  position:absolute;top:calc(100% + 1px);right:var(--pad);z-index:90;
  width:min(400px,calc(100vw - 32px));
  padding:16px;border:1px solid var(--hair-dark);border-radius:2px;
  background:var(--ink-800);color:var(--on-ink-1);
  box-shadow:var(--shadow-2);
  animation:panelIn var(--dur) var(--ease);
}
.channel-panel[hidden]{display:none}
@keyframes panelIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.channel-panel__head{
  display:flex;align-items:center;gap:8px;
  padding-bottom:12px;margin-bottom:6px;
  border-bottom:1px solid var(--hair-dark);
  font-size:12px;letter-spacing:.16em;color:var(--on-ink-2);
}
.channel-panel__list{display:flex;flex-direction:column}
.channel-item{
  display:grid;grid-template-columns:28px minmax(0,1fr);gap:2px 10px;
  padding:12px 10px;border:1px solid transparent;border-radius:2px;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.channel-item:hover{border-color:var(--vermilion-500);background:rgba(255,255,255,.04)}
.channel-item__no{grid-row:1 / 3;font-size:11px;color:var(--vermilion-500);padding-top:3px}
.channel-item__name{font-size:14px;letter-spacing:.06em;color:var(--porcelain-50)}
.channel-item__desc{font-size:12px;line-height:1.6;letter-spacing:.03em;color:var(--on-ink-3)}
.channel-panel__foot{
  display:flex;align-items:center;gap:10px;
  margin-top:8px;padding-top:14px;border-top:1px solid var(--hair-dark);
}
.channel-panel__link{
  font-size:13px;letter-spacing:.08em;color:var(--porcelain-50);
  padding-bottom:2px;border-bottom:1px solid var(--vermilion-500);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.channel-panel__link:hover{color:var(--vermilion-100);border-color:var(--vermilion-100)}

.cmd-bar__progress{
  position:absolute;left:0;bottom:0;height:2px;width:100%;
  background:var(--vermilion-500);
  transform:scaleX(0);transform-origin:left;
  transition:transform .12s linear;
}

body.nav-open{overflow:hidden}

/* ---------- footer ---------- */
.site-foot{background:var(--ink-900);color:var(--on-ink-2);border-top:1px solid var(--hair-dark)}
.foot-inner{
  max-width:var(--wrap);margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--pad) clamp(32px,4vw,48px);
  display:grid;grid-template-columns:1.6fr repeat(4,minmax(0,1fr));gap:32px 24px;
}
.foot-brand{display:flex;flex-direction:column;gap:0}
.foot-brand__name{font-family:var(--serif);font-weight:900;font-size:24px;letter-spacing:.04em;color:var(--porcelain-50)}
.foot-brand__sub{margin-top:8px;font-size:13px;letter-spacing:.06em;color:var(--on-ink-2)}
.foot-brand__coord{margin-top:16px;font-size:11px;letter-spacing:.12em;color:var(--mint-soft)}

.foot-col__title{
  font-size:12px;font-weight:500;letter-spacing:.18em;color:var(--porcelain-50);
  padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid var(--hair-dark);
}
.foot-col__list{display:flex;flex-direction:column;gap:9px;font-size:13.5px;line-height:1.6;color:var(--on-ink-3)}
.foot-col__list a{color:var(--on-ink-2);transition:color var(--dur) var(--ease)}
.foot-col__list a:hover{color:var(--porcelain-50)}

.foot-base{border-top:1px solid var(--hair-dark)}
.foot-legal{
  max-width:var(--wrap);margin-inline:auto;
  padding:20px var(--pad) 36px;
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
  font-size:12px;letter-spacing:.06em;color:var(--on-ink-3);
}
.foot-legal__item{line-height:1.7}
.foot-links{display:flex;flex-wrap:wrap;gap:16px;margin-left:auto}
.foot-links a{color:var(--on-ink-2);transition:color var(--dur) var(--ease)}
.foot-links a:hover{color:var(--vermilion-100)}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .nav__link{padding:10px 9px;font-size:13px}
}

@media (max-width:1024px){
  .foot-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-brand{grid-column:1 / -1}
  .foot-links{margin-left:0;width:100%}
}

@media (max-width:960px){
  :root{--pad:16px;--bar-h:60px}
  .cmd-bar__inner{min-height:var(--bar-h);gap:12px}
  .brand__sub{display:none}
  .brand__mark{font-size:17px}
  .nav-toggle{display:inline-flex}
  .cmd-btn__long{display:none}
  .cmd-btn__short{display:inline}
  .cmd-tools{margin-left:auto}

  .nav{
    position:fixed;top:var(--bar-h);left:0;right:0;z-index:70;
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    background:var(--ink-900);border-bottom:1px solid var(--hair-dark);
    padding:12px var(--pad) 24px;
    max-height:calc(100vh - var(--bar-h));overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{display:block;padding:15px 2px;font-size:16px;border-bottom:1px solid var(--hair-dark)}
  .nav__link::after{left:2px;right:auto;width:28px;bottom:11px}
  .nav__foot{
    display:block;margin-top:18px;
    font-size:12px;letter-spacing:.08em;line-height:1.75;color:var(--on-ink-3);
  }
  .channel-panel{left:var(--pad);right:var(--pad);width:auto}
}

@media (max-width:600px){
  body{font-size:16px}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  .foot-inner{grid-template-columns:1fr;gap:28px}
  .foot-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .cmd-btn{padding:8px 11px;font-size:12px}
  .sec-head{gap:10px}
}

/* ---------- motion preference ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .cmd-bar__progress{transition:none}
}