/* BeSOS Professional · shared base
   Dark for welcome, menu and title screens (night blue, warm light); light for all reading pages (ivory paper, ink navy).
   One accent across both: brass. Fraunces for display, Libre Franklin for text, Hanken Grotesk for UI, IBM Plex Mono for labels. */
:root{
  color-scheme:light;
  --ivory:#F7F3EA; --sheet:#FFFDF8; --paper2:#EEE7D9; --ink:#1E2A36; --ink2:#4F5B67; --line:rgba(30,42,54,.13);
  --night:#14202A; --night2:#1E2E3B; --moon:#F3EADB; --moon2:#C8BBA6;
  --brass:#C9A15A; --brass2:#A87F3C; --brass3:#7E5D27; --brassBg:#F5ECDA;
  --sea:#3E6177; --seaL:#CBD7DC; --seaBg:#E8EEF0;
  --display:"Fraunces",Georgia,serif; --body:"Libre Franklin",Arial,sans-serif; --mono:"IBM Plex Mono",ui-monospace,monospace; --ui:"Hanken Grotesk",system-ui,sans-serif;
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .12 0 0 0 0 .16 0 0 0 0 .2 0 0 0 .045 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  --frame:0 0 0 1px var(--brass),0 0 0 7px var(--night),0 0 0 8px rgba(201,161,90,.45);
  --gutter:max(28px,env(safe-area-inset-left,0px));
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ivory) var(--grain);color:var(--ink);font-family:var(--body);font-size:17.5px;line-height:1.7;-webkit-font-smoothing:antialiased}
body.is-dark{background:var(--night);color:var(--moon)}
img{max-width:100%;height:auto}
a{color:inherit}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--brass2);outline-offset:3px}
.screen-reader-text{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}
.skip-link:focus{position:fixed;left:12px;top:12px;z-index:100;width:auto;height:auto;clip:auto;padding:10px 16px;background:var(--sheet);color:var(--ink)}

/* ---------- site header ---------- */
.site{position:sticky;top:env(safe-area-inset-top,0px);z-index:30;background:rgba(247,243,234,.94);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
  padding-left:var(--gutter);padding-right:max(28px,env(safe-area-inset-right,0px))}
.site .in{max-width:1320px;margin:0 auto;height:64px;display:flex;align-items:center;gap:28px;font-size:14.5px}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto;font-family:var(--display);font-variation-settings:'SOFT' 100,'opsz' 72;font-weight:500;font-size:21px;color:inherit;text-decoration:none}
.brand img{height:22px;width:auto}
.brand small{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;opacity:.75;margin-left:4px}
.site nav ul{list-style:none;margin:0;padding:0;display:flex;gap:26px}
.site nav a{text-decoration:none;opacity:.72;padding:4px 0;border-bottom:1px solid transparent;transition:opacity .3s,border-color .3s}
.site nav a:hover{opacity:1}
.site nav .current-menu-item>a,.site nav .current_page_item>a,.site nav a[aria-current]{opacity:1;border-bottom-color:var(--brass)}
.prog{position:absolute;left:0;bottom:-1px;height:2px;background:var(--brass);width:0;transition:width .15s linear}
/* header on dark screens floats over the picture */
.site.dark{position:absolute;left:0;right:0;top:0;background:linear-gradient(180deg,rgba(14,22,30,.7),rgba(14,22,30,0));border:0;color:var(--moon);-webkit-backdrop-filter:none;backdrop-filter:none}
.site.dark .brand img{animation:spin 60s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- footer ---------- */
.foot-site{border-top:1px solid var(--line);padding-left:var(--gutter);padding-right:max(28px,env(safe-area-inset-right,0px));padding-block:28px 34px;font-size:13.5px;color:var(--ink2)}
.foot-site .in{max-width:1320px;margin:0 auto;display:flex;flex-wrap:wrap;gap:12px 32px;align-items:center;justify-content:space-between}
.foot-site ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 22px}
.foot-site a{text-decoration:none}
.foot-site a:hover{text-decoration:underline}
.foot-site .coords{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase}
body.is-dark .foot-site{border-top-color:rgba(243,234,219,.12);color:var(--moon2)}

/* ---------- plain pages (Impressum, Datenschutz …) ---------- */
.plain{max-width:72ch;margin:0 auto;padding-left:var(--gutter);padding-right:max(28px,env(safe-area-inset-right,0px));padding-block:64px 96px}
.plain h1{font-family:var(--display);font-variation-settings:"SOFT" 100,"opsz" 144;font-weight:320;font-size:clamp(34px,4.4vw,52px);line-height:1.04;margin:0 0 24px}
.plain h2{font-family:var(--display);font-weight:420;font-size:26px;margin:40px 0 8px}
.plain h3{font-family:var(--display);font-weight:450;font-size:20px;margin:28px 0 6px}

@media (max-width:960px){.site nav{display:none}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.site.dark .brand img{animation:none}}