/* Biber Ventures – minimalistisch, schwarz/weiß mit grünen Akzenten */
:root{
  --ink:#111;
  --grey:#6b6b6b;
  --line:#e7e7e7;
  --soft:#f7f7f6;
  --green:#00a651;
  --green-light:#2ecc71;
  --black:#0c0c0c;
  --white:#fff;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.7;font-size:17px;-webkit-font-smoothing:antialiased}
.wrap{max-width:1100px;margin:0 auto;padding:0 32px}
a{color:inherit}

[data-lang="en"] .de,[data-lang="de"] .en{display:none}

/* ---------- Header ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none}
.logo img{height:22px;width:auto}
.logo b{font-size:17px;letter-spacing:2.5px;font-weight:700}
.logo b span{color:inherit;font-weight:inherit}
nav ul{display:flex;gap:32px;list-style:none;align-items:center}
nav a.nl{text-decoration:none;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;color:var(--grey);padding-bottom:4px;border-bottom:2px solid transparent;transition:.2s}
nav a.nl:hover{color:var(--ink)}
nav a.nl.current{color:var(--ink);border-bottom-color:var(--green)}
.lang-switch{display:flex;gap:2px;margin-left:8px}
.lang-switch button{background:none;border:none;font-size:13px;letter-spacing:1px;color:var(--grey);cursor:pointer;padding:4px 7px}
.lang-switch button.active{color:var(--green);font-weight:700}
.burger{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--ink)}

/* ---------- Hero / Page head ---------- */
.hero{padding:210px 0 130px}
.hero h1{font-size:clamp(38px,5.6vw,66px);line-height:1.08;letter-spacing:-.02em;font-weight:700;max-width:900px;margin:18px 0 30px}
.hero h1 em{font-style:normal;color:var(--green)}
.hero p.sub{font-size:20px;color:var(--grey);max-width:640px;margin-bottom:44px}
.page-head{padding:180px 0 80px;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(34px,4.6vw,54px);letter-spacing:-.02em;line-height:1.1;font-weight:700;margin-top:16px;max-width:860px}
.page-head p.sub{font-size:19px;color:var(--grey);max-width:680px;margin-top:22px}

.kicker{color:var(--green);letter-spacing:3px;text-transform:uppercase;font-size:12px;font-weight:600}

.btn{display:inline-block;padding:15px 34px;background:var(--black);color:var(--white);text-decoration:none;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;transition:.2s;border:1px solid var(--black)}
.btn:hover{background:var(--green);border-color:var(--green)}
.btn.ghost{background:none;color:var(--ink);margin-left:12px}
.btn.ghost:hover{border-color:var(--green);color:var(--green);background:none}

/* ---------- Sections ---------- */
section{padding:100px 0}
section.soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
h2{font-size:clamp(26px,3.2vw,38px);letter-spacing:-.015em;font-weight:700;margin:14px 0 18px}
.lead{font-size:19px;color:var(--grey);max-width:740px}
.rule{width:56px;height:3px;background:var(--green);margin-top:28px}

/* Cards / grids */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:54px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:54px}
.card{border:1px solid var(--line);background:var(--white);padding:44px 38px;transition:border-color .2s}
.card:hover{border-color:var(--green)}
.card .num{font-size:13px;letter-spacing:2px;color:var(--green);font-weight:700;margin-bottom:16px}
.card h3{font-size:21px;font-weight:700;margin-bottom:12px}
.card p{color:var(--grey);font-size:16px}
.card a.more{display:inline-block;margin-top:20px;color:var(--green);text-decoration:none;font-size:14px;letter-spacing:1px;text-transform:uppercase;font-weight:600}
.card a.more:hover{text-decoration:underline}
.card ul{list-style:none;margin-top:16px}
.card li{padding:9px 0 9px 24px;position:relative;border-top:1px solid var(--line);font-size:16px}
.card li::before{content:"–";color:var(--green);position:absolute;left:0;font-weight:700}

/* Badges */
.badge{display:inline-block;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700;padding:4px 12px;border:1px solid}
.badge.active{color:var(--green);border-color:var(--green)}
.badge.exit{color:var(--grey);border-color:var(--line);background:var(--soft)}

/* Portfolio */
.pf{border:1px solid var(--line);padding:46px 42px;margin-top:32px;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:start;transition:border-color .2s}
.pf:hover{border-color:var(--green)}
.pf h3{font-size:23px;font-weight:700;margin-bottom:4px}
.pf .meta{color:var(--grey);font-size:14px;letter-spacing:.5px;margin-bottom:14px}
.pf p{color:var(--grey);font-size:16px}
.pf.compact{padding:24px 32px;margin-top:18px}
.pf.compact h3{font-size:20px;margin-bottom:6px}

/* Timeline (Gregor) */
.tl{margin-top:50px;border-left:2px solid var(--line);padding-left:38px;display:flex;flex-direction:column;gap:42px}
.tl-item{position:relative}
.tl-item::before{content:"";position:absolute;left:-45px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--green)}
.tl-item .when{font-size:13px;letter-spacing:1.5px;color:var(--green);text-transform:uppercase;font-weight:700}
.tl-item h3{font-size:20px;font-weight:700;margin:6px 0 2px}
.tl-item .org{color:var(--grey);font-size:15px;margin-bottom:8px}
.tl-item p{color:var(--grey);font-size:16px;max-width:720px}

/* Facts */
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:54px}
.fact{border-top:3px solid var(--green);padding-top:20px}
.fact .big{font-size:34px;font-weight:700;letter-spacing:-.02em}
.fact p{color:var(--grey);font-size:15px;margin-top:4px}

/* Contact */
.contact-box{border:1px solid var(--line);padding:60px;margin-top:50px;display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
a.mail{color:var(--green);font-size:clamp(18px,2.6vw,26px);font-weight:700;text-decoration:none;letter-spacing:-.01em;border-bottom:2px solid var(--green)}
a.mail:hover{opacity:.75}

/* Footer */
footer{background:var(--black);color:rgba(255,255,255,.65);padding:60px 0 40px;font-size:14px}
.foot-top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:24px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.12);margin-bottom:26px}
.foot-top .logo b{color:#fff}
footer nav a{color:rgba(255,255,255,.65);text-decoration:none;margin-left:26px;font-size:13px;letter-spacing:1px;text-transform:uppercase}
footer nav a:hover{color:var(--green-light)}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.foot-bottom a{color:rgba(255,255,255,.65);text-decoration:none;margin-left:22px}
.foot-bottom a:hover{color:var(--green-light)}

/* Einklappbare Projektbeispiele */
details.acc{border:1px solid var(--line);background:var(--white);margin-top:14px;transition:border-color .2s}
details.acc:hover{border-color:var(--green)}
details.acc summary{cursor:pointer;padding:18px 26px;font-weight:700;font-size:18px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
details.acc summary::-webkit-details-marker{display:none}
details.acc summary::after{content:"+";color:var(--green);font-size:24px;font-weight:400;line-height:1}
details.acc[open] summary::after{content:"–"}
details.acc .body{padding:0 26px 22px;color:var(--grey);font-size:16px}

/* Fließtext (Profil) */
.prose{max-width:800px;margin-top:34px}
.prose p{margin-bottom:24px}
.prose p:last-child{margin-bottom:0}

/* Chips (Branchen) */
.chips{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.chip{border:1px solid var(--line);padding:8px 18px;font-size:14px;letter-spacing:.5px;color:var(--ink);background:var(--white)}
.chip b{color:var(--green);font-weight:700;margin-right:6px}

/* Megatrend-Label */
.trend{display:inline-block;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700;color:var(--green);border:1px solid var(--green);padding:4px 12px;margin-bottom:14px}

/* Kontaktformular */
.cform{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px;max-width:820px}
.cform .full{grid-column:1/-1}
.cform label{display:block;font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--grey);margin-bottom:8px;font-weight:600}
.cform input,.cform textarea{width:100%;border:1px solid var(--line);background:var(--white);padding:14px 16px;font:inherit;font-size:16px;color:var(--ink);outline:none;transition:border-color .2s;border-radius:0}
.cform input:focus,.cform textarea:focus{border-color:var(--green)}
.cform textarea{min-height:160px;resize:vertical}
.cform .btn{border:none;cursor:pointer}
.form-note{grid-column:1/-1;font-size:13px;color:var(--grey)}

@media(max-width:900px){
  .cform{grid-template-columns:1fr}
  nav ul{display:none;position:absolute;top:76px;left:0;right:0;background:var(--white);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:0;padding:8px 0 18px}
  nav ul.open{display:flex}
  nav ul li{padding:12px 32px}
  .burger{display:block}
  .hero{padding:150px 0 90px}
  .page-head{padding:140px 0 60px}
  section{padding:70px 0}
  .grid2,.grid3,.facts,.contact-box{grid-template-columns:1fr}
  .contact-box{padding:40px 28px}
  .pf{grid-template-columns:1fr}
}