/* pwp-authored-additional-v1-20261028: technical foundation only */
@layer pwp-runtime-foundation {
  :root {
    --bg:#F0F9FF; --text:#0C4A6E;
    --surface:#FFFFFF; --text-muted:#475569;
    --primary:#0369A1; --primary-fg:#FFFFFF;
    --border:#BAE6FD;
  }
  *, *::before, *::after { box-sizing:border-box; }
  html { scroll-behavior:smooth; }
  body { margin:0; background:var(--bg); color:var(--text); }
  img, video { max-inline-size:100%; block-size:auto; }
  button, input, select, textarea { font:inherit; }
  button, summary { cursor:pointer; }
  :where(a,button,input,select,textarea,summary):focus-visible { outline:2px solid currentColor; outline-offset:4px; }
  .skip { position:fixed; inset-block-start:-10rem; inset-inline-start:1rem; z-index:10000; padding:.75rem; background:var(--bg); color:var(--text); }
  .skip:focus { inset-block-start:1rem; }
  /* Legal prose is a separate utility; never constrain the author's main site. */
  .legal-container { max-inline-size:76ch; margin-inline:auto; padding:clamp(1rem,4vw,3rem); }
  .legal-body { line-height:1.7; overflow-wrap:anywhere; }
  .legal-body p + p, .legal-body section + section { margin-block-start:1.25em; }
  .legal-body table { display:block; overflow-x:auto; max-inline-size:100%; }
  .legal-body h1, .legal-body h2, .legal-body h3, .legal-title { line-height:1.2; }
  .cookie-banner { position:fixed; inset-inline:1rem; inset-block-end:1rem; z-index:9999; max-inline-size:34rem; padding:1rem; border:1px solid var(--border); background:var(--bg); color:var(--text); }
  .cookie-text { font:14px/1.5 system-ui,sans-serif; }
  .cookie-actions { display:flex; flex-wrap:wrap; gap:.75rem; margin-block-start:.75rem; }
  .cookie-actions button { min-block-size:44px; padding:.6rem 1rem; border:1px solid var(--border); background:var(--surface); color:var(--text); }
  .cookie-actions [data-action="accept-cookie"] { background:var(--primary); color:var(--primary-fg); }
}
/* Required state, not a visual layout. Expanded pages may be grid/flex/block. */
[hidden], .cookie-banner.hidden { display:none !important; }
@media(prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  *, *::before, *::after { animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; }
}

/* === AUTHOR-OWNED SITE STYLES === */
:root{--ink:#173d32;--muted:#56685e;--paper:#fafbf7;--white:#fff;--mint:#e0edcf;--line:#d4ddd1;--accent:#b84c2b;--deep:#143f32;--soft:#eff3eb;--heading:"Manrope",sans-serif;--body:"IBM Plex Sans",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,a,input,summary{ -webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}a:hover{color:var(--accent)}img{max-width:100%;display:block}button{cursor:pointer}[hidden]{display:none!important}.skip{position:absolute;left:16px;top:-100px;background:var(--white);padding:12px;z-index:20}.skip:focus{top:10px}.wrap{width:min(1344px,calc(100% - 96px));margin-inline:auto}.site-header{background:var(--paper);border-bottom:1px solid var(--line);position:relative;z-index:10}.header-inner{min-height:104px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;line-height:1.05;color:var(--ink)}.brand-mark{display:grid;place-items:center;width:45px;height:48px;background:var(--ink);color:var(--mint);font:600 37px "Newsreader",serif;border-radius:0 14px 0 0}.brand-name{font:750 22px var(--heading);letter-spacing:-1px}.brand-name small{display:block;font:400 12px var(--body);letter-spacing:2.6px;margin-top:5px}.nav-links{display:flex;align-items:center;gap:30px;font-size:15px}.nav-links>a{text-decoration:none}.topic-menu{position:relative}.topic-menu summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:10px;list-style:none}.topic-menu summary::-webkit-details-marker{display:none}.topic-menu summary::after{content:"⌄";font-size:19px}.topic-menu[open] summary::after{content:"⌃"}.topic-panel{position:absolute;top:48px;left:-24px;min-width:290px;background:var(--white);border:1px solid var(--line);box-shadow:0 12px 24px #173d3212;padding:12px}.topic-panel a{display:block;padding:12px;text-decoration:none;border-bottom:1px solid var(--line)}.topic-panel a:last-child{border:0}.topic-panel a:hover{background:var(--soft)}.language{display:flex;gap:10px;padding-left:24px;border-left:1px solid var(--line);font-size:13px}.language a{text-decoration:none}.language a[hreflang=de]{font-weight:600;text-decoration:underline}.eyebrow{font-size:13px;font-weight:600;letter-spacing:.08em;margin:0 0 24px;display:flex;gap:10px;align-items:center}.eyebrow::before{content:"";width:24px;height:2px;background:currentColor}h1,h2,h3{font-family:var(--heading);font-weight:600;line-height:1.15;letter-spacing:-.045em;margin:0}h1{font-size:clamp(42px,5.4vw,78px)}h2{font-size:clamp(30px,3.3vw,46px)}h3{font-size:25px}p{margin:0 0 20px}.hero{padding:58px 0 0}.hero-stage{background:var(--mint);display:grid;grid-template-columns:1.12fr 1fr;min-height:540px}.hero-copy{padding:54px 40px 48px 48px;align-self:center}.hero-copy h1{margin-bottom:26px}.hero-copy .intro{font-size:19px;max-width:460px;line-height:1.6;margin-bottom:32px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:30px;text-decoration:none;background:var(--deep);color:white;padding:14px 22px;min-height:52px;font-size:15px;font-weight:500;border:1px solid var(--deep)}.button:hover{background:#255541;color:#fff}.button .arrow{font-size:23px;line-height:1}.hero-image{position:relative;min-height:420px;margin:20px 20px 20px 0}.hero-image img{width:100%;height:100%;position:absolute;object-fit:cover;object-position:center}.photo-note{position:absolute;bottom:16px;left:16px;right:16px;background:var(--paper);padding:16px 20px;font-size:14px;line-height:1.5}.photo-note strong{display:block;font-weight:600}.editorial-line{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}.section{padding:84px 0}.section-top{display:flex;justify-content:space-between;align-items:end;gap:40px;margin-bottom:34px}.section-top p{max-width:410px;color:var(--muted);margin:0}.reading-list{border-top:1px solid var(--ink)}.reading-item{display:grid;grid-template-columns:150px 1fr 52px;gap:28px;padding:30px 0;border-bottom:1px solid var(--line);text-decoration:none;align-items:center}.reading-item .category{font-size:14px;color:var(--muted)}.reading-item h3{margin-bottom:8px}.reading-item p{font-size:16px;margin:0;color:var(--muted);max-width:690px}.circle-arrow{width:46px;height:46px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-size:23px;transition:transform .18s}.reading-item:hover .circle-arrow{transform:translateX(4px);border-color:var(--accent)}.concept-band{background:var(--deep);color:var(--paper);padding:64px 0}.concept-inner{display:grid;grid-template-columns:1fr 1fr;gap:90px;align-items:center}.concept-copy p{color:#cfdfd2;max-width:520px;margin-top:24px}.text-link{font-size:15px;font-weight:500}.purchasing{border-left:1px solid #597267;padding-left:48px}.purchasing-head{font-size:14px;color:#cfdfd2;margin-bottom:25px}.value-row{display:grid;grid-template-columns:115px 1fr 70px;gap:16px;align-items:center;margin:18px 0;font-size:15px}.value-track{height:30px;background:#31594a}.value-fill{display:block;height:100%;background:var(--mint);width:100%}.value-fill.later{width:90.7%;background:#deb28c}.value-row strong{text-align:right;font-size:20px}.diagram-note{font-size:12px;line-height:1.6;color:#cfdfd2;margin-top:22px}.editorial-promise{display:grid;grid-template-columns:1fr 1fr;gap:80px;padding:64px 0}.editorial-promise p{color:var(--muted);margin:0}.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:48px 0 24px}.footer-main{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:45px;padding-bottom:34px}.footer-title{font:600 19px var(--heading);letter-spacing:-.5px;margin-bottom:15px}.footer-main p,.footer-main address{font-size:14px;line-height:1.8;font-style:normal;margin:0;color:var(--muted)}.footer-links{display:flex;gap:8px 22px;flex-wrap:wrap;padding-top:22px;border-top:1px solid var(--line);font-size:12px}.copyright{margin-right:auto}.article{padding:60px 0 84px}.breadcrumb{font-size:14px;margin-bottom:38px;color:var(--muted)}.breadcrumb a{text-decoration:none}.article-header{max-width:920px;margin-bottom:46px}.article-header h1{font-size:clamp(39px,4.5vw,65px);max-width:900px}.article-lead{font-size:21px;line-height:1.6;margin-top:26px;color:var(--muted);max-width:780px}.article-meta{font-size:13px;margin-top:26px;display:flex;gap:20px;color:var(--muted)}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:90px;align-items:start}.prose h2{font-size:31px;margin:40px 0 18px}.prose h2:first-child{margin-top:0}.prose h3{font-size:23px;margin:28px 0 12px}.prose p,.prose li{color:#344e43}.prose ul,.prose ol{padding-left:23px;margin:18px 0 26px}.prose li{padding-left:5px;margin-bottom:12px}.aside-note{background:var(--soft);padding:26px;font-size:15px}.aside-note h2{font-size:22px;margin-bottom:16px}.aside-note p{color:var(--muted)}.aside-note a{display:block;padding:13px 0;border-top:1px solid var(--line);font-size:14px}.callout{border-left:3px solid var(--accent);padding:22px 26px;background:var(--soft);margin:30px 0}.callout p:last-child{margin-bottom:0}.table-wrap{overflow:auto;margin:26px 0}table{border-collapse:collapse;width:100%;font-size:15px;text-align:left}th,td{border-bottom:1px solid var(--line);padding:14px 12px;vertical-align:top}th{background:var(--soft);font-weight:600}.calculator{background:var(--mint);padding:30px;margin:36px 0}.calculator h2{margin-top:0}.calc-fields{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0}.calc-fields label{display:block;font-size:14px;font-weight:500}.calc-fields input{display:block;width:100%;min-width:0;padding:12px;background:var(--paper);border:1px solid #8ea58a;color:var(--ink);border-radius:0;margin-top:7px}.calc-result{border-top:1px solid #a5baa0;padding-top:20px;display:flex;justify-content:space-between;align-items:center;gap:20px}.calc-result output{font:600 31px var(--heading);letter-spacing:-1px}.small{font-size:13px!important}.calculator .small{margin-top:16px;margin-bottom:0}.next-reading{border-top:1px solid var(--line);margin-top:45px;padding-top:25px}.contact{padding:70px 0 90px}.contact-intro{max-width:760px;margin-bottom:60px}.contact-intro p{font-size:21px;color:var(--muted);margin-top:25px}.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:90px}.contact-block{padding:27px 0;border-top:1px solid var(--line)}.contact-block h2{font-size:23px;margin-bottom:15px}.contact-block p{margin-bottom:10px}.contact-email{font-family:var(--heading);font-size:clamp(19px,2.5vw,30px);word-break:break-word}.contact-aside{background:var(--mint);padding:35px;align-self:start}.contact-aside h2{font-size:28px;margin-bottom:24px}.contact-aside p{font-size:16px}.contact-aside address{font-style:normal;font-size:16px;margin-bottom:20px}
@media(min-width:1600px){.hero-stage{min-height:610px}.hero-copy{padding:65px}}
@media(max-width:1050px){.wrap{width:calc(100% - 56px)}.header-inner{gap:20px}.nav-links{gap:20px}.language{padding-left:15px;gap:8px}.hero-copy{padding:35px 30px}.hero-copy h1{font-size:58px}.hero-image{min-height:460px}.concept-inner{gap:40px}.article-layout{gap:40px;grid-template-columns:minmax(0,1fr) 250px}.reading-item{grid-template-columns:120px 1fr 46px;gap:20px}.contact-grid{gap:45px}}
@media(max-width:760px){.wrap{width:calc(100% - 36px)}.header-inner{flex-wrap:wrap;min-height:auto;padding:19px 0 12px;gap:18px}.brand-name{font-size:20px}.brand-mark{width:38px;height:41px;font-size:32px}.nav-links{width:100%;justify-content:space-between;gap:12px;font-size:14px;flex-wrap:wrap}.language{margin-left:auto;padding-left:12px;font-size:12px}.topic-panel{left:-70px;min-width:260px;max-width:calc(100vw - 40px)}.hero{padding-top:24px}.hero-stage{grid-template-columns:1fr}.hero-copy{padding:34px 25px}.hero-copy h1{font-size:clamp(43px,10vw,66px)}.hero-copy .intro{font-size:17px}.hero-image{margin:0 16px 16px;min-height:290px}.eyebrow{margin-bottom:22px;font-size:12px}.editorial-line{font-size:12px;flex-direction:column;gap:3px}.section{padding:54px 0}.section-top{align-items:start;flex-direction:column;gap:20px}.section-top p{font-size:16px}.reading-item{grid-template-columns:1fr 40px;gap:10px;padding:25px 0}.reading-item .category{grid-column:1/-1;font-size:12px}.reading-item h3{font-size:24px}.reading-item p{font-size:15px}.circle-arrow{width:36px;height:36px}.concept-band{padding:45px 0}.concept-inner{grid-template-columns:1fr;gap:35px}.purchasing{border-left:0;border-top:1px solid #597267;padding:28px 0 0}.value-row{grid-template-columns:100px 1fr 65px;gap:10px;font-size:14px}.editorial-promise{grid-template-columns:1fr;gap:23px;padding:48px 0}.footer-main{grid-template-columns:1fr;gap:25px}.footer-links{gap:12px 20px}.copyright{width:100%}.article{padding:30px 0 55px}.breadcrumb{margin-bottom:28px}.article-header{margin-bottom:34px}.article-lead{font-size:18px}.article-layout{grid-template-columns:1fr;gap:38px}.prose h2{font-size:28px}.aside-note{padding:25px}.calculator{padding:22px}.calc-fields{grid-template-columns:1fr}.calc-result{align-items:start;flex-direction:column;gap:7px}.contact{padding:40px 0 55px}.contact-intro{margin-bottom:35px}.contact-intro p{font-size:18px}.contact-grid{grid-template-columns:1fr;gap:30px}.contact-aside{padding:27px}.photo-note{font-size:13px}.article-meta{flex-wrap:wrap;gap:7px 20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* === OPEN NAVIGATION SURFACE SAFETY === */
/* Position, shadows, borders and scroll treatment belong to the author.
   Only an OPEN mobile menu gets a mandatory opaque readable surface. */
header.site-header[data-pwp-nav-open] {
  background-color: var(--bg, #ffffff) !important;
  isolation: isolate;
}
[data-pwp-mobile-menu][data-pwp-menu-open] {
  background-color: var(--bg, #ffffff);
  color: var(--text, #0f172a);
  max-block-size: var(--pwp-nav-available-height, calc(100dvh - 6rem));
  overflow-y: auto;
  overscroll-behavior: contain;
}
.pwp-source-note {
  margin-block-start: 1rem;
  font-size: .875em;
  line-height: 1.5;
}
.pwp-source-note a { text-decoration: underline; text-underline-offset: .2em; }