/* KeulTech Venture — professionelles Basis-Stylesheet.
   Design-Prinzipien: klare Hierarchie, großzügiger Weißraum, EIN dominanter CTA,
   ruhige Palette + 1 Akzent, mobil-first. Änderungen nur im Rahmen von DESIGN-STANDARD.md. */

:root{
  --ink:#0f172a;         /* Text dunkel */
  --ink-soft:#475569;    /* Text weich */
  --line:#e2e8f0;        /* Trennlinien */
  --bg:#ffffff;
  --bg-alt:#f8fafc;      /* Sektions-Wechsel */
  --brand:#1d4ed8;       /* Akzent (EINE Farbe) */
  --brand-dark:#1e3a8a;
  --brand-tint:#eff4ff;
  --radius:14px;
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
  --maxw:1080px;
  --font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container.narrow{max-width:720px}
a{color:var(--brand);text-decoration:none}

/* Buttons — EIN dominanter Stil */
.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:600;
  padding:14px 28px;border-radius:10px;transition:.15s;box-shadow:var(--shadow)}
.btn:hover{background:var(--brand-dark);transform:translateY(-1px)}
.btn-lg{padding:17px 36px;font-size:1.05rem}
.btn-sm{padding:9px 18px;font-size:.9rem}
.btn-invert{background:#fff;color:var(--brand)}
.btn-invert:hover{background:var(--brand-tint)}
.btn-ghost{color:var(--ink-soft);font-weight:600;padding:14px 8px}
.btn-ghost:hover{color:var(--brand)}

/* Navigation */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;font-size:1.25rem;color:var(--ink);letter-spacing:-.02em}
.logo span{color:var(--brand)}
.nav-links{display:flex;gap:28px}
.nav-links a{color:var(--ink-soft);font-weight:500}
.nav-links a:hover{color:var(--ink)}

/* Hero */
.hero{padding:84px 0 64px;background:linear-gradient(180deg,var(--brand-tint),#fff)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.eyebrow{display:inline-block;background:#fff;border:1px solid var(--line);color:var(--brand);
  font-weight:600;font-size:.8rem;padding:6px 14px;border-radius:99px;margin-bottom:20px}
.hero h1{font-size:clamp(2.1rem,4.5vw,3.3rem);line-height:1.1;letter-spacing:-.03em;margin-bottom:18px}
.lead{font-size:1.2rem;color:var(--ink-soft);max-width:34ch;margin-bottom:30px}
.hero-cta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.trust-row{list-style:none;display:flex;gap:22px;flex-wrap:wrap;color:var(--ink-soft);font-size:.92rem;font-weight:500}
.hero-visual{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);min-height:280px;display:flex;align-items:center;justify-content:center;
  color:var(--ink-soft);padding:24px;font-size:1rem}

/* Sektionen */
.section{padding:72px 0}
.section:nth-of-type(even){background:var(--bg-alt)}
.section-title{font-size:clamp(1.6rem,3vw,2.2rem);letter-spacing:-.02em;text-align:center;margin-bottom:12px}
.section-sub{text-align:center;color:var(--ink-soft);font-size:1.1rem;max-width:52ch;margin:0 auto 44px}

/* Nutzen-Karten */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow)}
.card-ico{width:48px;height:48px;border-radius:12px;background:var(--brand-tint);display:flex;
  align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:16px}
.card h3{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--ink-soft)}

/* Social Proof */
.proof{background:var(--brand);color:#fff}
.proof blockquote{font-size:clamp(1.3rem,2.6vw,1.7rem);font-weight:500;text-align:center;
  max-width:40ch;margin:0 auto 16px;line-height:1.4}
.proof cite{display:block;text-align:center;opacity:.85;font-style:normal}

/* Preise */
.pricing{display:flex;gap:24px;justify-content:center;flex-wrap:wrap}
.price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 30px;width:320px;box-shadow:var(--shadow)}
.price-card.featured{border:2px solid var(--brand);position:relative}
.price-card.featured::before{content:"Empfohlen";position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--brand);color:#fff;font-size:.75rem;font-weight:600;padding:5px 14px;border-radius:99px}
.price-card h3{font-size:1.2rem;margin-bottom:6px}
.price{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;margin:10px 0}
.price small{font-size:1rem;font-weight:500;color:var(--ink-soft)}
.price-card ul{list-style:none;margin:20px 0 26px}
.price-card li{padding:7px 0 7px 26px;position:relative;color:var(--ink-soft)}
.price-card li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}
.price-card .btn{width:100%;text-align:center}
.fineprint{text-align:center;color:var(--ink-soft);font-size:.88rem;margin-top:24px}

/* FAQ */
details{border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin-bottom:12px;background:#fff}
details summary{font-weight:600;cursor:pointer;list-style:none}
details summary::after{content:"+";float:right;color:var(--brand);font-weight:700}
details[open] summary::after{content:"–"}
details p{color:var(--ink-soft);margin-top:12px}

/* Abschluss-CTA */
.cta-band{background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;text-align:center}
.cta-band h2{font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:26px;color:#fff}

/* Footer */
.footer{border-top:1px solid var(--line);padding:34px 0;color:var(--ink-soft);font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer a{color:var(--ink-soft)}
.footer a:hover{color:var(--brand)}

/* Mobil */
@media(max-width:820px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-visual{min-height:200px;order:-1}
  .cards{grid-template-columns:1fr}
  .nav-links{display:none}
  .section{padding:52px 0}
  .hero{padding:56px 0 44px}
}
/* Rechtstext-Seiten (impressum/datenschutz) erben body; schlichter Lesefluss */
.legal{max-width:720px;margin:0 auto;padding:56px 24px}
.legal h1{margin-bottom:24px}.legal h2{margin:26px 0 10px;font-size:1.15rem}
.legal p{color:var(--ink-soft);margin-bottom:10px}

/* Venture 01: Vorher/Nachher-Visual im Hero (im Rahmen des Design-Standards, nutzt nur Palette-Variablen) */
.hero-visual{align-items:stretch}
.ba{width:100%;display:flex;flex-direction:column;gap:10px;font-size:.95rem}
.ba-row{border:1px solid var(--line);border-radius:10px;padding:14px 16px;background:var(--bg-alt)}
.ba-row:last-child{background:#fff;border-color:var(--brand);box-shadow:var(--shadow)}
.ba-tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--ink-soft);background:var(--line);padding:3px 10px;border-radius:99px;margin-bottom:8px}
.ba-tag.ba-good{color:#fff;background:var(--brand)}
.ba-before{color:var(--ink-soft);text-decoration:line-through;text-decoration-color:rgba(71,85,105,.5)}
.ba-arrow{text-align:center;color:var(--brand);font-weight:700;line-height:1}
.ba-list{list-style:none;margin-top:10px;color:var(--ink-soft);font-size:.88rem}
.ba-list li{padding:3px 0 3px 22px;position:relative}
.ba-list li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}