/* Wurzelholz – Spiel & Raum · Gestaltungsidee: das Skizzenbuch eines Ingenieurs */
:root{--paper:#f6f3ed;--paper-2:#efebe2;--sheet:#fff;--ink:#2a2826;--graphite:#6b665e;--line:#d8d1c3;--accent:#2e6f62;--accent-2:#e3ece8;
--serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;--sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
--wrap:1180px;--gap:clamp(1.25rem,3vw,2.5rem);--section:clamp(4.5rem,10vw,8.5rem);--radius:4px}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
[id]{scroll-margin-top:96px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;font-family:var(--sans);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--paper);
background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.45 0 0 0 0 0.40 0 0 0 0 0.32 0 0 0 .05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px} a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.15;margin:0 0 .6em;letter-spacing:-.01em}
h1{font-size:clamp(2.3rem,5.2vw,4.1rem)} h2{font-size:clamp(1.8rem,3.6vw,2.75rem)} h3{font-size:1.35rem}
p{margin:0 0 1em}
.wrap{width:min(var(--wrap),100% - 2*var(--gap));margin-inline:auto}
.section{padding-block:var(--section)} .section--tint{background:var(--paper-2)} .section--line{border-top:1px solid var(--line)}
.eyebrow{font-size:.78rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--graphite);margin-bottom:1.2rem;display:flex;align-items:center;gap:.75rem}
.eyebrow::before{content:"";width:2.2rem;height:1px;background:currentColor}
.lead{font-size:clamp(1.1rem,1.6vw,1.3rem);color:var(--graphite);max-width:36em}
.muted{color:var(--graphite)} .small{font-size:.875rem}
.section-head{max-width:46rem;margin-bottom:clamp(2.5rem,5vw,4rem)} .section-head p{color:var(--graphite);font-size:1.125rem}
.skip{position:absolute;left:-999px} .skip:focus{left:1rem;top:1rem;z-index:99;background:#fff;padding:.5rem 1rem}
.btn{display:inline-flex;align-items:center;gap:.6rem;padding:.95rem 1.6rem;border-radius:var(--radius);background:var(--ink);color:var(--paper);text-decoration:none;font-weight:600;font-size:1rem;border:1px solid var(--ink);transition:background .2s,color .2s,transform .2s;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#fff;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--ink)} .btn--ghost:hover{background:var(--ink);color:var(--paper)}
.btn--small{padding:.55rem 1.05rem;font-size:.9rem}
.link-arrow{font-weight:600;text-decoration:none;color:var(--ink);border-bottom:1px solid var(--line);padding-bottom:2px}
.link-arrow::after{content:" →"} .link-arrow:hover{color:var(--accent);border-color:var(--accent)}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:1.5rem;margin-top:2rem}
.site-header{position:sticky;top:0;z-index:50;background:rgba(246,243,237,.9);backdrop-filter:blur(8px);border-bottom:1px solid transparent;transition:border-color .3s}
.site-header.is-scrolled{border-bottom-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px}
.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;color:var(--ink)} .brand svg{width:34px;height:34px}
.brand-name{font-family:var(--serif);font-size:1.35rem;line-height:1}
.brand-name small{display:block;font-family:var(--sans);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--graphite);margin-top:.3rem}
.menu{display:flex;align-items:center;gap:2rem}
.menu a:not(.btn){color:var(--ink);text-decoration:none;font-size:.95rem;white-space:nowrap;padding-block:.3rem;border-bottom:1px solid transparent}
.menu a:not(.btn):hover,.menu a[aria-current="page"]{border-bottom-color:var(--ink)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:var(--radius);padding:.5rem .9rem;font:inherit;font-size:.9rem;color:var(--ink);cursor:pointer}
@media (max-width:860px){.nav-toggle{display:inline-block}
.menu{position:absolute;inset:76px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:.5rem var(--gap) 1.5rem;display:none}
.menu.is-open{display:flex} .menu a:not(.btn){width:100%;padding:.9rem 0;border-bottom:1px solid var(--line)} .menu .btn{margin-top:1rem}}
.sketch{mix-blend-mode:multiply}
figure{margin:0}
figcaption{font-family:var(--serif);font-style:italic;font-size:.92rem;color:var(--graphite);margin-top:.8rem}
.photo img{width:100%;object-fit:cover;border-radius:2px;box-shadow:0 12px 30px -16px rgba(42,40,38,.35)}
.sheet{background:var(--sheet);padding:clamp(.6rem,1.4vw,1rem);box-shadow:0 1px 2px rgba(42,40,38,.06),0 12px 30px -12px rgba(42,40,38,.22);border-radius:2px;position:relative}
.sheet::before{content:"";position:absolute;top:-10px;left:50%;width:84px;height:22px;transform:translateX(-50%) rotate(-2deg);background:rgba(227,220,200,.75)}
.sheet a{display:block} .sheet img{width:100%}
.placeholder{display:grid;place-items:center;text-align:center;gap:.3rem;aspect-ratio:4/5;border:1px dashed #bdb4a3;border-radius:var(--radius);color:var(--graphite);font-size:.88rem;padding:1.5rem;margin-bottom:1rem;background:repeating-linear-gradient(-45deg,transparent 0 14px,rgba(189,180,163,.13) 14px 15px)}
.placeholder strong{font-family:var(--serif);font-weight:500;font-size:1.05rem;color:var(--ink)} .placeholder code{font-size:.78rem}
.hero{padding-block:clamp(2.5rem,6vw,5rem) clamp(3rem,7vw,6rem);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(2rem,4vw,4rem);align-items:center}
.hero-figure{margin-right:calc(-1*var(--gap))} .hero-figure img{width:100%}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}.hero-figure{margin-right:0;order:-1}}
.page-hero{padding-block:clamp(3rem,7vw,6rem) clamp(2.5rem,6vw,5rem)}
.page-hero .hero-grid{grid-template-columns:minmax(0,6fr) minmax(0,5fr)}
@media (max-width:900px){.page-hero .hero-grid{grid-template-columns:1fr}}
.principles{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(2.5rem,5vw,4rem) clamp(2rem,6vw,6rem)}
.principle svg{width:46px;height:46px;stroke:var(--ink);fill:none;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;margin-bottom:1rem}
.principle p{color:var(--graphite);margin:0}
@media (max-width:800px){.principles{grid-template-columns:1fr}}
.feature-figure{margin-bottom:clamp(2.5rem,5vw,4rem)}
.feature-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(2rem,5vw,5rem);align-items:start}
@media (max-width:900px){.feature-grid{grid-template-columns:1fr}}
.steps-inline{list-style:none;padding:0;margin:1.8rem 0 0;counter-reset:s}
.steps-inline li{counter-increment:s;display:grid;grid-template-columns:2.4rem 1fr;gap:.2rem 1rem;padding:1rem 0;border-top:1px solid var(--line)}
.steps-inline li::before{content:counter(s,decimal-leading-zero);font-family:var(--serif);color:var(--accent);font-size:1.05rem;grid-row:span 2;padding-top:.1rem}
.steps-inline strong{font-weight:600} .steps-inline span{color:var(--graphite);font-size:.96rem}
.learn{margin-top:2rem;padding:1.4rem 1.6rem;background:var(--accent-2);border-left:3px solid var(--accent)}
.learn h3{font-size:1.1rem;margin-bottom:.5rem} .learn p{margin:0;font-size:.96rem}
.concepts{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1.5rem,3vw,2.5rem) clamp(1.25rem,2.5vw,2.25rem)}
.concept img{aspect-ratio:1/1;object-fit:cover;width:100%;transition:transform .5s ease}
.concept .img-wrap{overflow:hidden;border-bottom:1px solid var(--line);margin-bottom:1.1rem}
.concept:hover img{transform:scale(1.03)}
.concept h3{margin-bottom:.35rem} .concept p{color:var(--graphite);font-size:.97rem;margin-bottom:.7rem}
.tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
@media (max-width:900px){.concepts{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.concepts{grid-template-columns:1fr}}
.offer{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(2rem,5vw,5rem);align-items:start}
@media (max-width:900px){.offer{grid-template-columns:1fr}}
.study{background:var(--sheet);padding:clamp(1.8rem,3.5vw,2.8rem);border-top:3px solid var(--accent);box-shadow:0 12px 30px -16px rgba(42,40,38,.25)}
.checks{list-style:none;padding:0;margin:1.2rem 0 1.8rem}
.checks li{padding:.45rem 0 .45rem 1.8rem;position:relative;border-bottom:1px dashed var(--line)}
.checks li::before{content:"";position:absolute;left:.2rem;top:.95rem;width:.7rem;height:.38rem;border-left:1.6px solid var(--accent);border-bottom:1.6px solid var(--accent);transform:rotate(-45deg)}
.lines{list-style:none;padding:0;margin:0}
.lines li{padding:1.4rem 0;border-top:1px solid var(--line)} .lines li:last-child{border-bottom:1px solid var(--line)}
.lines h3{margin:0 0 .35rem} .lines p{margin:0;color:var(--graphite);font-size:.96rem;max-width:34rem}
.process{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(1.5rem,3vw,2.5rem);counter-reset:p}
.process.three{grid-template-columns:repeat(3,1fr)}
.process li{counter-increment:p;border-top:1px solid var(--ink);padding-top:1.2rem}
.process li::before{content:counter(p,decimal-leading-zero);display:block;font-family:var(--serif);font-size:2.2rem;color:var(--line);line-height:1;margin-bottom:.8rem}
.process h3{font-size:1.15rem;margin-bottom:.4rem} .process p{color:var(--graphite);font-size:.95rem;margin:0}
@media (max-width:900px){.process,.process.three{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.process,.process.three{grid-template-columns:1fr}}
.about{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:clamp(2rem,5vw,5rem);align-items:start}
.about-side{display:grid;gap:2.5rem;position:sticky;top:110px}
.about-side .portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center top;mix-blend-mode:multiply}
.about-side .photo img{aspect-ratio:4/5}
@media (max-width:860px){.about{grid-template-columns:1fr}.about-side{position:static;grid-template-columns:1fr 1fr;gap:1.25rem}}
.about blockquote{margin:1.8rem 0;padding:0 0 0 1.4rem;border-left:2px solid var(--accent);font-family:var(--serif);font-size:1.3rem;line-height:1.45;color:var(--ink)}
.facts{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.5rem 0 2.2rem;padding:0;list-style:none}
.facts li{border:1px solid var(--line);border-radius:99px;padding:.3rem .85rem;font-size:.85rem;background:rgba(255,255,255,.5)}
.cross{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
@media (max-width:600px){.cross{grid-template-columns:1fr}}
.cross a{display:block;text-decoration:none;color:var(--ink);background:var(--sheet);padding:1.3rem;border:1px solid var(--line);transition:border-color .2s,transform .2s}
.cross a:hover{border-color:var(--ink);transform:translateY(-2px)}
.cross img{aspect-ratio:16/10;object-fit:cover;width:100%;margin-bottom:1rem}
.cross h3{font-size:1.15rem;margin-bottom:.25rem} .cross p{color:var(--graphite);font-size:.92rem;margin:0}
.services{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--ink);counter-reset:sv}
.services article{counter-increment:sv;padding:1.8rem 1.8rem 2rem 0;border-bottom:1px solid var(--line)}
.services article:not(:nth-child(3n)){border-right:1px solid var(--line)}
.services article:not(:nth-child(3n+1)){padding-left:1.8rem}
.services article::before{content:counter(sv,decimal-leading-zero);font-family:var(--serif);color:var(--accent);display:block;margin-bottom:.6rem}
.services h3{font-size:1.2rem} .services p{color:var(--graphite);font-size:.96rem;margin:0}
@media (max-width:900px){.services{grid-template-columns:1fr 1fr}.services article{padding:1.6rem 1.2rem 1.6rem 0!important;border-right:0!important}}
@media (max-width:560px){.services{grid-template-columns:1fr}}
.side{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:clamp(2rem,5vw,5rem);align-items:start}
@media (max-width:860px){.side{grid-template-columns:1fr}}
.plain{list-style:none;padding:0;margin:0}
.plain li{padding:1.1rem 0;border-top:1px solid var(--line)} .plain li:last-child{border-bottom:1px solid var(--line)}
.plain strong{display:block;font-family:var(--serif);font-weight:500;font-size:1.15rem;margin-bottom:.15rem}
.plain span{color:var(--graphite);font-size:.95rem}
.sheets{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(2rem,4vw,3rem);margin-top:1rem}
.sheets .wide{grid-column:span 2}
@media (max-width:760px){.sheets{grid-template-columns:1fr}.sheets .wide{grid-column:auto}}
.sheet-caption{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-top:.9rem;font-size:.9rem}
.sheet-caption span{color:var(--graphite)} .sheet-caption a{font-weight:600;text-decoration:none}
.band{background:var(--ink);color:var(--paper)} .band h2{color:var(--paper)} .band p{color:#cfc9be}
.band .grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,5rem)}
@media (max-width:800px){.band .grid-2{grid-template-columns:1fr}}
.band ul{margin:0;padding-left:1.1rem;color:#e6e1d7} .band li{margin-bottom:.6rem}
.refs{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1.5rem,3vw,2.5rem)}
@media (max-width:900px){.refs{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.refs{grid-template-columns:1fr}}
.refs img{aspect-ratio:4/5;object-fit:cover;width:100%;margin-bottom:1rem;border-radius:2px}
.refs h3{font-size:1.12rem;margin-bottom:.2rem} .refs p{color:var(--graphite);font-size:.92rem;margin:0}
.cta{text-align:center} .cta h2{max-width:22ch;margin-inline:auto}
.cta p{max-width:38rem;margin:0 auto 2rem;color:var(--graphite);font-size:1.12rem} .cta .actions{justify-content:center}
.contact{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(2rem,5vw,5rem);align-items:start}
@media (max-width:900px){.contact{grid-template-columns:1fr}}
.form{display:grid;gap:1.2rem} .form .row{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
@media (max-width:560px){.form .row{grid-template-columns:1fr}}
label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.4rem}
input,select,textarea{width:100%;font:inherit;color:var(--ink);background:var(--sheet);border:1px solid var(--line);border-radius:var(--radius);padding:.8rem .9rem}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-2)}
textarea{min-height:160px;resize:vertical}
.check{display:flex;gap:.7rem;align-items:flex-start;font-weight:400;font-size:.9rem;color:var(--graphite)} .check input{width:auto;margin-top:.3rem}
.hp{position:absolute;left:-9999px}
.contact-card{background:var(--sheet);padding:2rem;border:1px solid var(--line);margin-bottom:1.5rem}
.contact-card h3{font-size:1.15rem} .contact-card p:last-child{margin-bottom:0}
.site-footer{border-top:1px solid var(--line);padding-block:3.5rem 2.5rem;font-size:.92rem;color:var(--graphite)}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}
@media (max-width:760px){.foot{grid-template-columns:1fr}}
.site-footer h4{font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink);margin:0 0 1rem}
.site-footer ul{list-style:none;padding:0;margin:0} .site-footer li{margin-bottom:.45rem}
.site-footer a{color:var(--graphite);text-decoration:none;overflow-wrap:anywhere} .site-footer a:hover{color:var(--ink)}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.82rem}
.prose{max-width:44rem} .prose h2{font-size:1.5rem;margin-top:2.5rem}
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .8s ease,transform .8s ease}
.js .reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js .reveal{opacity:1;transform:none;transition:none}}