/* ============================================================
   polish.css — shared depth & motion layer for all pages.
   Additive only: fonts, colors, and layout come from each page.
   Pair with polish.js.
   ============================================================ */

:root{
  --pl-ease: cubic-bezier(.22,1,.36,1);
  --pl-sh1: 0 1px 2px rgba(15,24,48,.06), 0 2px 6px rgba(15,24,48,.05), 0 12px 24px -12px rgba(15,24,48,.10);
  --pl-sh2: 0 2px 4px rgba(15,24,48,.06), 0 10px 22px -8px rgba(15,24,48,.13), 0 24px 48px -20px rgba(15,24,48,.22);
}

/* faint dot grid gives light sections a material feel */
body{
  background-image:radial-gradient(rgba(19,21,27,.045) 1px, transparent 1px);
  background-size:24px 24px;
}

/* --- scroll progress hairline --- */
.pl-progress{position:fixed;top:0;left:0;width:100%;height:3px;z-index:300;
  transform-origin:left;transform:scaleX(0);background:var(--a,#1A4AD4);}

/* --- glass nav (built by polish.js from the page's own nav) --- */
.pl-glassnav{position:fixed;top:0;left:0;right:0;z-index:200;transform:translateY(-110%);
  transition:transform .55s var(--pl-ease);
  background:rgba(255,255,255,.72);-webkit-backdrop-filter:blur(18px) saturate(1.8);backdrop-filter:blur(18px) saturate(1.8);
  border-bottom:1px solid rgba(19,21,27,.07);box-shadow:0 12px 40px -24px rgba(15,24,48,.4);}
.pl-glassnav.show{transform:translateY(0);}
.pl-glassnav .wrap{max-width:1180px;margin:0 auto;padding:0 40px;}
.pl-glassnav .nav{border-bottom:none;padding:11px 0;background:none;}
.pl-glassnav .nav .mark{color:var(--ink,#13151b);}
.pl-glassnav .nav .links a{color:var(--ink2,#454b56);}
.pl-glassnav .nav .links a:hover{background:rgba(19,21,27,.06);color:var(--ink,#13151b);border-color:transparent;}
.pl-glassnav .nav .links a.on{background:var(--a,#1A4AD4);color:#fff;}

/* --- scroll reveals (elements tagged by polish.js; replay on every pass) --- */
[data-reveal]{opacity:0;transform:translate(var(--tx,0),var(--ty,36px));will-change:opacity,transform;
  transition:opacity .85s var(--pl-ease), transform .85s var(--pl-ease);
  transition-delay:var(--rd,0ms);}
[data-reveal].in{opacity:1;transform:none;will-change:auto;}
html.noanim [data-reveal]{opacity:1;transform:none;transition:none;}

/* --- layered shadows + springy hover on cards --- */
.ixc,.feat,.glance,.pjfeat,.plist2,.pc,.pcard,.docwrap,.formcard,.methods .mrow{box-shadow:var(--pl-sh1);}
.ixc,.pc,.pcard{transition:transform .5s var(--pl-ease), box-shadow .5s var(--pl-ease), border-color .3s;}
.ixc:hover,.pc:hover,.pcard:hover{transform:translateY(-5px);box-shadow:var(--pl-sh2);}
.feat,.glance,.pjfeat{transition:transform .5s var(--pl-ease), box-shadow .5s var(--pl-ease), border-color .3s;}
.feat:hover,.pjfeat:hover{transform:translateY(-3px);box-shadow:var(--pl-sh2);}
.pjfeat .im img{transition:transform .9s var(--pl-ease);}
.pjfeat:hover .im img{transform:scale(1.04);}
.pl2{transition:background .25s, transform .3s var(--pl-ease);}
.pl2:hover{transform:translateX(4px);}

/* --- cursor spotlight (span injected by polish.js) --- */
.ixc,.feat,.pc,.pcard{position:relative;overflow:hidden;}
.pl-spot{position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .35s;
  background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%), rgba(26,74,212,.09), transparent 65%);}
.ixc:hover .pl-spot,.feat:hover .pl-spot,.pc:hover .pl-spot,.pcard:hover .pl-spot{opacity:1;}

/* --- buttons: sheen sweep, tinted glow, press state --- */
.btn{position:relative;overflow:hidden;}
.btn::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(105deg,transparent 38%,rgba(255,255,255,.5) 50%,transparent 62%);
  transform:translateX(-130%);transition:transform .8s ease;}
.btn:hover::before{transform:translateX(130%);}
.btn.solid{box-shadow:0 1px 2px rgba(15,24,48,.2), 0 10px 24px -10px rgba(26,74,212,.65);}
.btn:active{transform:scale(.96)!important;transition-duration:.08s;}

/* --- sliding underline on section "more" links --- */
.sechead .more{position:relative;padding-bottom:3px;}
.sechead .more::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:currentColor;
  transform:scaleX(0);transform-origin:left;transition:transform .4s var(--pl-ease);}
.sechead .more:hover::after{transform:scaleX(1);}

/* --- numbered section eyebrows (markup on index) --- */
.secno{font-family:var(--fmono,monospace);font-size:10px;letter-spacing:2.5px;text-transform:uppercase;
  color:var(--faint,#878d99);display:flex;align-items:center;gap:10px;margin-bottom:10px;}
.secno::after{content:"";width:46px;height:1px;background:var(--rule2,#d2d8e0);display:inline-block;}
.secno b{color:var(--a,#1A4AD4);font-weight:500;}

/* --- footer accent hairline --- */
footer{position:relative;}
footer::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,#3fd2e8 0%,var(--a,#1A4AD4) 35%,rgba(26,74,212,0) 85%);}

/* --- branded keyboard focus --- */
:focus-visible{outline:2px solid var(--a,#1A4AD4);outline-offset:3px;border-radius:6px;}

/* --- cross-page transitions --- */
@view-transition{navigation:auto;}
::view-transition-old(root){animation:plVtOut .22s ease both;}
::view-transition-new(root){animation:plVtIn .3s ease both;}
@keyframes plVtOut{to{opacity:0;transform:translateY(-6px);}}
@keyframes plVtIn{from{opacity:0;transform:translateY(8px);}}

html.noanim *,html.noanim *::before,html.noanim *::after{animation:none!important;transition:none!important;}