/* ===========================================================
   AUO – Stylesheet (Pilot v1, Studien-Detail)
   Designziele: medizinisch klar, ruhig, hochwertig, barrierefrei
   =========================================================== */

:root{
  --auo-blue:        #0b3a6f;     /* Primärblau */
  --auo-blue-dark:   #082c54;
  --auo-blue-soft:   #e7eef7;
  --auo-accent:      #2a8a8f;     /* Akzent (medizin. Türkis) */
  --auo-accent-soft: #e3f2f3;
  --auo-warn:        #b8550b;
  --auo-ok:          #1f7a3a;
  --auo-ink:         #16202c;
  --auo-ink-mute:    #4d5b6b;
  --auo-line:        #dde3ec;
  --auo-bg:          #f6f8fb;
  --auo-card:        #ffffff;
  --radius:          10px;
  --shadow:          0 1px 2px rgba(8,32,64,.06), 0 6px 18px rgba(8,32,64,.05);
  --maxw:            1200px;
  --font-sans:       "Inter", "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif:      "Source Serif 4", Georgia, serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; color:var(--auo-ink); background:var(--auo-bg);
  font-family:var(--font-sans); font-size:16px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%; height:auto}
a{color:var(--auo-blue); text-decoration:underline; text-underline-offset:2px}
a:hover{color:var(--auo-blue-dark)}
h1,h2,h3{font-family:var(--font-sans); color:var(--auo-blue-dark); line-height:1.2; margin:0 0 .5em}
h1{font-size:clamp(1.6rem, 2.4vw + 1rem, 2.4rem); letter-spacing:-.01em}
h2{font-size:1.35rem; margin-top:0}
h3{font-size:1.05rem; color:var(--auo-ink)}
.container{max-width:var(--maxw); margin:0 auto; padding:0 20px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:-9999px;top:0;background:#fff;padding:.5rem 1rem;z-index:1000}
.skip-link:focus{left:1rem;top:1rem;outline:2px solid var(--auo-accent)}

/* ====== HEADER ====== */
.site-header{background:#fff; border-bottom:1px solid var(--auo-line); position:sticky; top:0; z-index:50}
.topbar{background:var(--auo-blue); color:#fff}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;gap:1rem}
.brand{display:flex;align-items:center;gap:.7rem;color:#fff;text-decoration:none}
.brand__logo{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:8px;background:#fff;color:var(--auo-blue);font-weight:800;letter-spacing:.02em}
.brand__text strong{display:block;font-size:.95rem;letter-spacing:.04em}
.brand__text small{display:block;font-size:.72rem;opacity:.85}
.meta-nav{display:flex;gap:1rem;font-size:.85rem}
.meta-nav a{color:#fff;text-decoration:none;opacity:.9}
.meta-nav a:hover{opacity:1;text-decoration:underline}
.nav-toggle{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:#fff;margin:6px auto;width:22px;border-radius:2px}
.main-nav__inner{padding:0 20px}
.pillars{list-style:none;margin:0;padding:0;display:flex;gap:.25rem;flex-wrap:wrap}
.pillars a{display:inline-block;padding:14px 16px;color:var(--auo-ink);text-decoration:none;font-weight:600;border-bottom:3px solid transparent}
.pillars a:hover{color:var(--auo-blue)}
.pillars .is-active a, .pillars a[aria-current="page"]{color:var(--auo-blue);border-bottom-color:var(--auo-accent)}

@media (max-width:860px){
  .nav-toggle{display:block}
  .meta-nav{display:none}
  .main-nav{display:none;background:#fff;border-top:1px solid var(--auo-line)}
  .main-nav.is-open{display:block}
  .pillars{flex-direction:column}
  .pillars a{padding:14px 20px;border-bottom:1px solid var(--auo-line)}
}

/* ====== BREADCRUMB ====== */
.breadcrumb{padding:14px 20px;font-size:.85rem;color:var(--auo-ink-mute)}
.breadcrumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.breadcrumb li+li::before{content:"›";margin-right:.4rem;color:var(--auo-ink-mute)}
.breadcrumb a{color:var(--auo-ink-mute)}

/* ====== HERO ====== */
.study-hero{background:linear-gradient(180deg,#fff 0%,var(--auo-blue-soft) 100%);border-bottom:1px solid var(--auo-line)}
.study-hero__grid{display:grid;grid-template-columns:1fr 320px;gap:2rem;padding:28px 20px 36px}
.study-hero__sub{font-weight:400;color:var(--auo-ink-mute);font-size:.7em;display:block;margin-top:.25rem}
.study-hero__lead{font-size:1.05rem;color:var(--auo-ink);max-width:62ch}
.study-hero__ids dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.5rem 1.5rem;margin:1.25rem 0 0;padding:1rem;background:#fff;border:1px solid var(--auo-line);border-radius:var(--radius)}
.study-hero__ids dt{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--auo-ink-mute)}
.study-hero__ids dd{margin:0;font-weight:600}
.study-hero__cta{display:flex;flex-direction:column;gap:.6rem;align-self:start;background:#fff;padding:1rem;border:1px solid var(--auo-line);border-radius:var(--radius);box-shadow:var(--shadow)}
@media (max-width:860px){ .study-hero__grid{grid-template-columns:1fr} }

/* ====== BADGES ====== */
.badges{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.75rem}
.badge{display:inline-block;font-size:.75rem;font-weight:600;padding:.25rem .55rem;border-radius:999px;border:1px solid transparent;letter-spacing:.02em}
.badge--status{background:#e8f5ec;color:var(--auo-ok);border-color:#bfe2c9}
.badge--phase{background:#eef1f7;color:var(--auo-blue-dark);border-color:#cdd6e6}
.badge--entity{background:var(--auo-accent-soft);color:#1f5e62;border-color:#b6dcde}
.badge--line{background:#fff4e3;color:var(--auo-warn);border-color:#f3d6a6}
.badge--som{background:var(--auo-blue);color:#fff;border-color:var(--auo-blue)}

/* ====== BUTTONS ====== */
.btn{display:inline-block;padding:.7rem 1rem;border-radius:8px;font-weight:600;text-decoration:none;text-align:center;border:1px solid transparent;cursor:pointer;font-size:.95rem}
.btn--primary{background:var(--auo-blue);color:#fff}
.btn--primary:hover{background:var(--auo-blue-dark);color:#fff}
.btn--ghost{background:#fff;color:var(--auo-blue);border-color:var(--auo-blue)}
.btn--ghost:hover{background:var(--auo-blue-soft)}

/* ====== SUBNAV ====== */
.subnav{position:sticky;top:60px;background:#fff;border-bottom:1px solid var(--auo-line);z-index:40;overflow-x:auto}
.subnav__inner{display:flex;gap:.25rem;padding:0 20px}
.subnav a{padding:12px 14px;text-decoration:none;color:var(--auo-ink-mute);border-bottom:2px solid transparent;white-space:nowrap;font-size:.9rem}
.subnav a:hover, .subnav a.is-active{color:var(--auo-blue);border-bottom-color:var(--auo-accent)}

/* ====== LAYOUT ====== */
.study-layout{display:grid;grid-template-columns:1fr 320px;gap:2rem;padding:28px 20px 60px}
@media (max-width:980px){ .study-layout{grid-template-columns:1fr} }

/* ====== CARDS ====== */
.card{background:var(--auo-card);border:1px solid var(--auo-line);border-radius:var(--radius);padding:1.4rem 1.4rem;box-shadow:var(--shadow);margin-bottom:1.25rem;scroll-margin-top:130px}
.card h2{border-bottom:2px solid var(--auo-blue-soft);padding-bottom:.4rem;margin-bottom:1rem}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}
@media (max-width:680px){ .two-col{grid-template-columns:1fr} }
.kv{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:200px 1fr;gap:.4rem 1rem}
.kv li{display:contents}
.kv li>span:first-child{color:var(--auo-ink-mute);font-weight:600}
.kv li>span:last-child{padding-bottom:.6rem;border-bottom:1px dashed var(--auo-line)}
.hint{font-size:.85rem;color:var(--auo-ink-mute);margin-top:.5rem}
.docs{list-style:none;margin:0;padding:0}
.docs li{padding:.5rem 0;border-bottom:1px solid var(--auo-line)}
.doc-locked{color:var(--auo-ink-mute)}
.card--quote blockquote{font-family:var(--font-serif);font-size:1.05rem;border-left:4px solid var(--auo-accent);padding:.25rem 0 .25rem 1rem;margin:0;color:#22303f}
.card--quote footer{margin-top:.6rem;font-family:var(--font-sans);color:var(--auo-ink-mute);font-size:.9rem}
.card--facts dl.facts{display:grid;grid-template-columns:1fr;gap:.5rem;margin:0}
.card--facts .facts>div{display:flex;justify-content:space-between;gap:1rem;padding:.3rem 0;border-bottom:1px dashed var(--auo-line)}
.card--facts dt{color:var(--auo-ink-mute);font-size:.85rem}
.card--facts dd{margin:0;font-weight:600;text-align:right}
.card--related ul{list-style:none;margin:0;padding:0}
.card--related li{padding:.35rem 0}
.card--disclaimer{background:var(--auo-blue-soft);border-color:#cdd9eb}
.card--disclaimer h2{border-color:#cdd9eb}

/* ====== FOOTER ====== */
.site-footer{background:var(--auo-blue-dark);color:#cfd9e8;margin-top:2rem}
.site-footer__grid{display:grid;grid-template-columns:1.5fr 2fr 1fr;gap:1.5rem;padding:24px 20px;align-items:center}
.site-footer a{color:#fff;text-decoration:none;margin-right:1rem;opacity:.9}
.site-footer a:hover{opacity:1;text-decoration:underline}
.site-footer__meta{font-size:.8rem;opacity:.8;text-align:right}
@media (max-width:760px){ .site-footer__grid{grid-template-columns:1fr;text-align:left} .site-footer__meta{text-align:left} }

/* ====== PRINT ====== */
@media print{
  .site-header, .subnav, .study-hero__cta, .nav-toggle, .site-footer nav, .breadcrumb, .skip-link { display:none !important; }
  body{background:#fff;color:#000;font-size:11pt}
  .container{max-width:none;padding:0}
  .study-layout{grid-template-columns:1fr;gap:0;padding:0}
  .card{box-shadow:none;border:1px solid #999;page-break-inside:avoid;margin-bottom:.6rem}
  .study-hero{background:#fff}
  a{color:#000;text-decoration:none}
  .badges, .study-hero__ids{break-inside:avoid}
}