/* ─────────────────────────────────────────────────────────────────────────
   Erfaro Website — geteiltes Design-System (aus design/BRAND.md abgeleitet)
   Petrol-Primär, Bernstein GRAFIK-ONLY (nie Text/Button), Inter, 8px-Radien.
   ───────────────────────────────────────────────────────────────────────── */

:root{
  --primary:#0f5468; --primary-hover:#0c4553; --primary-2:#1f6e80;
  --primary-soft:#e8f0f2;
  --petrol-50:#f0f7fa; --petrol-100:#dcecf1; --petrol-200:#b8dfeb; --petrol-900:#0c3a48;
  --accent:#c6852a; --accent-soft:#f7eedd; --warn-text:#6b4a15;
  --bg:#f7f8fa; --surface:#ffffff; --border:#e2e6ea; --muted:#556570; --fg:#1a2a33;
  --ok:#1f5c43; --ok-soft:#e6f2ec;
  --radius:12px; --radius-sm:8px;
  --shadow-sm:0 1px 2px rgba(26,42,51,.06);
  --shadow:0 1px 3px rgba(26,42,51,.08),0 4px 12px -2px rgba(26,42,51,.08);
  --maxw:1120px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:var(--radius-sm)}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.section-sm{padding:48px 0}

/* Skip-Link */
.skip{position:absolute;left:-999px;top:0;background:var(--primary);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:100}
.skip:focus{left:0}

/* Typografie */
h1,h2,h3,h4{margin:0 0 .5em;font-weight:700;letter-spacing:-.01em;color:var(--fg)}
h1{font-size:clamp(32px,5vw,48px);line-height:1.14}
h2{font-size:clamp(26px,3.4vw,34px);line-height:1.2}
h3{font-size:20px;line-height:1.3}
p{margin:0 0 1em}
.lede{font-size:clamp(17px,2vw,20px);color:var(--muted);line-height:1.55;max-width:64ch}
.kicker{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--primary);line-height:1.35;margin:0 0 12px}
.muted{color:var(--muted)}

/* Wortmarke */
.mark{display:inline-flex;align-items:baseline;gap:1px;font-weight:700;font-size:22px;letter-spacing:-.01em;color:var(--primary);line-height:1.1}
.mark .dot{color:var(--primary)}

/* Header / Nav */
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,248,250,.85);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-links{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--fg);font-size:14.5px;font-weight:500}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.nav-cta{display:inline-flex;align-items:center;gap:6px;background:var(--primary);color:#fff;padding:9px 16px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;min-height:40px}
.nav-cta:hover{background:var(--primary-hover);text-decoration:none;color:#fff}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:8px;cursor:pointer}
@media(max-width:860px){
  .nav-links{position:fixed;inset:64px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:var(--surface);border-bottom:1px solid var(--border);padding:8px 24px 20px;transform:translateY(-120%);transition:transform .2s;box-shadow:var(--shadow)}
  .nav-links.open{transform:translateY(0)}
  .nav-links li{width:100%}
  .nav-links a{display:block;padding:12px 0;width:100%;border-bottom:1px solid var(--border)}
  .nav-links .nav-cta{margin-top:12px;justify-content:center}
  .nav-toggle{display:inline-flex}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;padding:12px 22px;border-radius:var(--radius-sm);min-height:44px;cursor:pointer;border:1px solid transparent;transition:background .15s,border-color .15s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);text-decoration:none;color:#fff}
.btn-secondary{background:var(--surface);color:var(--primary);border-color:var(--border);box-shadow:var(--shadow-sm)}
.btn-secondary:hover{background:var(--petrol-50);text-decoration:none}
.btn-row{display:flex;flex-wrap:wrap;gap:14px}

/* Hero */
.hero{padding:88px 0 64px}
.hero h1{max-width:18ch}
.hero .lede{margin-top:8px}
.hero .btn-row{margin-top:28px}

/* Cards / Grid */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:860px){.grid-2,.grid-3{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:26px}
.card h3{margin-bottom:8px}
.card p{margin:0;color:var(--muted);font-size:15px}
.card .ic{display:inline-grid;place-items:center;width:42px;height:42px;border-radius:10px;background:var(--primary-soft);color:var(--primary);margin-bottom:16px}
.card .ic .material-symbols-outlined{font-size:22px}

/* Feature-Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
@media(max-width:860px){.split{grid-template-columns:1fr;gap:28px}}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;text-align:center}
@media(max-width:640px){.stats{grid-template-columns:1fr}}
.stat .num{font-size:40px;font-weight:700;color:var(--primary);line-height:1.1}
.stat .lbl{color:var(--muted);font-size:14px;margin-top:4px}

/* Bänder */
.band{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.band-petrol{background:var(--primary);color:#fff}
.band-petrol h2,.band-petrol h3{color:#fff}
.band-petrol .lede,.band-petrol p{color:rgba(255,255,255,.85)}
.band-soft{background:var(--petrol-50)}

/* Pills / Badges */
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;padding:4px 11px;border-radius:99px;line-height:1.5}
.pill-petrol{background:var(--petrol-50);color:var(--primary)}
.pill-ok{background:var(--ok-soft);color:var(--ok)}
.eyebrow-accent{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--warn-text);background:var(--accent-soft);padding:4px 11px;border-radius:99px;line-height:1.35}

/* Material Symbols */
.material-symbols-outlined{font-variation-settings:'wght' 300,'opsz' 24;vertical-align:middle}

/* Listen mit Häkchen */
.checklist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.checklist li{display:flex;gap:11px;align-items:flex-start;color:var(--fg)}
.checklist .material-symbols-outlined{color:var(--ok);font-size:22px;flex:0 0 auto}

/* FAQ */
.faq details{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);margin-bottom:12px;padding:0}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'add';font-family:'Material Symbols Outlined';float:right;color:var(--primary)}
.faq details[open] summary::after{content:'remove'}
.faq details p{padding:0 20px 18px;margin:0;color:var(--muted)}

/* Breadcrumb */
.crumbs{font-size:13px;color:var(--muted);padding:20px 0 0}
.crumbs a{color:var(--muted)}

/* Prose (Glossar/Content) */
.prose{max-width:72ch}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.3em;color:var(--fg)}
.prose li{margin:.4em 0}
.prose blockquote{border-left:3px solid var(--primary);margin:1.4em 0;padding:.4em 0 .4em 1.2em;color:var(--muted);font-size:18px}

/* Glossar-Index */
.glossar-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.term-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px}
.term-card:hover{border-color:var(--primary);text-decoration:none;box-shadow:var(--shadow-sm)}
.term-card strong{display:block;color:var(--fg);font-size:16px;margin-bottom:4px}
.term-card span{color:var(--muted);font-size:13.5px}

/* Footer */
.site-footer{background:var(--primary);color:rgba(255,255,255,.85);padding:56px 0 28px;margin-top:24px}
.site-footer a{color:rgba(255,255,255,.85)}
.site-footer a:hover{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px}
.footer-grid ul{list-style:none;margin:0;padding:0}
.footer-grid li{margin:8px 0;font-size:14px}
.site-footer .mark{color:#fff}
.site-footer .mark .dot{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:36px;padding-top:20px;font-size:12.5px;display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between}

.hidden{display:none}