/* AirSysTrade GmbH – Stylesheet
   Immer dunkles Design: Grafit-Grundton, Blau (Logo) für Kühlen, Orange für Heizen. */
:root{
  --bg:#121315; --surface:#1A1B1E; --ink:#ECECEA; --muted:#9EA2A7; --line:#2B2D31;
  --cool:#5AA9E6; --cool-soft:#13263A; --heat:#F07A52; --heat-soft:#33180E;
  --deep:#0B0C0E; --on-deep:#F1F1EF; --on-deep-muted:#9A9EA3; --on-accent:#06131B;
  --f-display:"Archivo","Arial Narrow",Arial,sans-serif;
  --f-body:"Instrument Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --r:10px;
  color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--f-body)}
img{max-width:100%}
[hidden]{display:none!important}
a{color:inherit}
h1,h2,h3{font-family:var(--f-display);font-stretch:112%;line-height:1.08;text-wrap:balance;margin:0;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5.4vw,4rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.4vw,2.6rem);font-weight:750}
h3{font-size:1.2rem;font-weight:700}
p{margin:0}
.wrap{max-width:1180px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.eyebrow{font:500 .78rem/1.3 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--cool)}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
:focus-visible{outline:3px solid var(--cool);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-9999px;top:0;z-index:100;background:var(--ink);color:var(--bg);padding:.6rem 1rem}
.skip:focus{left:16px;top:8px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.8rem 1.3rem;border-radius:999px;border:2px solid transparent;font:600 .98rem/1 var(--f-body);text-decoration:none;cursor:pointer;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--cool);color:var(--on-accent)}
.btn-heat{background:var(--heat);color:var(--on-accent)}
.btn-ghost{border-color:var(--line);background:var(--surface);color:var(--ink)}
.btn-ghost:hover{border-color:var(--cool)}
.btn[disabled]{opacity:.6;cursor:wait;transform:none}

/* Topbar + Header */
.topbar{background:var(--deep);color:var(--on-deep-muted);font-size:.82rem}
.topbar .wrap{display:flex;gap:.3rem 1.5rem;justify-content:space-between;flex-wrap:wrap;padding-block:.45rem}
.topbar a{color:var(--on-deep);text-decoration:none;font-weight:600}
@media (max-width:600px){.topbar .wrap>span:last-child{display:none}}
header.site{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--line)}
header.site>.wrap{display:flex;align-items:center;gap:1.5rem;padding-block:.85rem}
.logo{display:flex;align-items:center;flex-shrink:0}
/* Logo: A, S und T folgen der Akzentfarbe (Blau beim Kühlen, Orange beim Heizen) */
.logo-svg{display:block;height:36px;width:auto;aspect-ratio:180/32;color:var(--cool);transition:color .4s}
@media (max-width:400px){.logo .logo-svg{height:30px}}
nav.main{display:flex;gap:.25rem;margin-left:auto}
nav.main a{padding:.5rem .75rem;border-radius:8px;text-decoration:none;font-weight:500;font-size:.95rem;color:var(--muted)}
nav.main a:hover{color:var(--ink);background:var(--bg)}
nav.main a[aria-current="page"]{color:var(--ink);background:var(--cool-soft)}
.head-cta{display:flex;gap:.75rem;align-items:center}
.head-phone{font:500 .9rem var(--f-mono);text-decoration:none;white-space:nowrap}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:8px;padding:.5rem .6rem;color:var(--ink);cursor:pointer}
.mobile-nav{display:none;border-top:1px solid var(--line);background:var(--surface)}
.mobile-nav.open{display:block}
.mobile-nav .wrap{display:grid;gap:.25rem;padding-block:.75rem 1rem}
.mobile-nav a{padding:.7rem .5rem;text-decoration:none;font-weight:500;border-bottom:1px solid var(--line);min-width:0;overflow-wrap:anywhere}
.mobile-nav a.btn{justify-content:center;margin-top:.6rem;border-bottom:0}
nav.main a,.btn,.head-phone{white-space:nowrap}
@media (max-width:1140px){nav.main,.head-phone{display:none}.burger{display:block}.head-cta{margin-left:0}}
@media (max-width:560px){.head-cta .btn{display:none}}

/* Abschnitte */
main{display:block}
.block{padding-block:clamp(3rem,7vw,5.5rem)}
.block.alt{background:var(--surface);border-block:1px solid var(--line)}
.block.tight{padding-top:1rem}
.sec-head{display:grid;gap:.9rem;margin-bottom:2.5rem;max-width:760px}
.phead{padding-block:clamp(2.5rem,5vw,4rem) 2rem;display:grid;gap:1rem}
.crumbs{font:500 .78rem var(--f-mono);color:var(--muted)}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.crumbs li+li::before{content:"/";margin-right:.4rem}
.crumbs a{text-decoration:none}
.crumbs a:hover{color:var(--cool)}

/* Hero */
.hero{padding-block:clamp(2.5rem,6vw,4.5rem) clamp(3rem,6vw,5rem)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center}
.hero-copy{display:grid;gap:1.4rem;min-width:0}
.hero-copy h1 em{font-style:normal;color:var(--cool);transition:color .4s}
.cta-row{display:flex;gap:.75rem;flex-wrap:wrap}
.checks{display:flex;flex-wrap:wrap;gap:.5rem 1.4rem;list-style:none;padding:0;margin:0;color:var(--muted);font-size:.93rem}
.checks li::before{content:"✓";color:var(--cool);font-weight:700;margin-right:.45rem}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}}

/* Thermostat */
.thermo{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:1.4rem;display:grid;gap:1.1rem;box-shadow:0 20px 50px -30px rgba(15,34,48,.45)}
.thermo-top{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.mode{display:inline-flex;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:3px}
.mode button{border:0;background:none;padding:.45rem .9rem;border-radius:999px;font:600 .85rem var(--f-body);color:var(--muted);cursor:pointer}
.mode button.on{background:var(--cool);color:var(--on-accent)}
.unit svg{width:100%;height:auto;display:block}
.readout{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.temp{font:800 clamp(3rem,7vw,4.4rem)/1 var(--f-display);font-variant-numeric:tabular-nums;color:var(--cool);transition:color .4s}
.temp small{font-size:.4em;font-weight:600;color:var(--muted);margin-left:.2rem}
.steppers{display:flex;gap:.5rem}
.steppers button{width:48px;height:48px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:600 1.4rem/1 var(--f-body);cursor:pointer}
.steppers button:hover{border-color:var(--cool)}
.spec{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;border-top:1px solid var(--line);padding-top:1rem;margin:0}
.spec div{display:grid;gap:.15rem}
.spec dt{font:500 .68rem var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.spec dd{margin:0;font:600 1rem var(--f-mono)}
/* Luftstrom: Geschwindigkeit setzt main.js je nach Lüfterstufe über --flow-speed */
.flow path{stroke-dasharray:10 14;animation:flow var(--flow-speed,1.6s) linear infinite}
@keyframes flow{to{stroke-dashoffset:-48}}

/* Heizen-Modus: die ganze Seite inkl. Kopfzeile übernimmt den warmen Akzent */
body.heat{--cool:var(--heat);--cool-soft:var(--heat-soft)}
body.heat .card-wp{order:-1}

/* Vertrauensleiste */
.trust{border-block:1px solid var(--line);background:var(--surface)}
.trust .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;padding-block:1.3rem}
.trust div{display:grid;gap:.15rem;min-width:0}
.trust b{font:700 1rem var(--f-display);font-stretch:110%}
.trust span{color:var(--muted);font-size:.86rem}
@media (max-width:800px){.trust .wrap{grid-template-columns:1fr 1fr}}

/* Karten */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
@media (max-width:1000px){.cards{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.cards{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:1.4rem;display:flex;flex-direction:column;gap:.8rem;text-decoration:none;transition:border-color .2s,transform .2s;min-width:0}
a.card:hover{border-color:var(--cool);transform:translateY(-2px)}
.card .ico{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;background:var(--cool-soft);color:var(--cool)}
.card .ico.h{background:var(--heat-soft);color:var(--heat)}
.card p{color:var(--muted);font-size:.95rem}
.card .more{margin-top:auto;font-weight:600;color:var(--cool);font-size:.92rem}

/* Ablauf */
.steps{display:grid;grid-template-columns:repeat(4,1fr);counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{padding:1.4rem 1.4rem 1.4rem 0;border-top:2px solid var(--line);position:relative;display:grid;gap:.5rem;align-content:start}
.steps li::before{counter-increment:s;content:"Schritt " counter(s);font:500 .72rem var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--cool)}
.steps li::after{content:"";position:absolute;top:-2px;left:0;width:40px;height:2px;background:var(--cool)}
.steps p{color:var(--muted);font-size:.95rem}
@media (max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* Zweispaltig */
.split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.split>*{min-width:0}
.split.wide-left{grid-template-columns:1.5fr 1fr}
@media (max-width:860px){.split,.split.wide-left{grid-template-columns:1fr}}
.prose{display:grid;gap:1rem;color:var(--muted)}
.prose h2,.prose h3{color:var(--ink)}
.prose h3{margin-top:.8rem}
.prose strong{color:var(--ink)}
.prose a{color:var(--cool)}
.prose ul{margin:0;padding-left:1.2rem;display:grid;gap:.3rem}
.bullets{list-style:none;padding:0;margin:0;display:grid;gap:.6rem}
.bullets li{padding-left:1.6rem;position:relative}
.bullets li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:10px;border-radius:2px;background:var(--cool)}

/* Bildfläche (bis echte Fotos vorliegen) */
.ph{border-radius:var(--r);aspect-ratio:4/3;max-width:100%;border:1px solid var(--line);display:grid;place-items:center;color:var(--cool);background:
  repeating-linear-gradient(135deg,transparent 0 14px,color-mix(in srgb,var(--cool) 10%,transparent) 14px 15px),
  linear-gradient(160deg,var(--cool-soft),var(--bg))}
.ph.h{color:var(--heat);background:repeating-linear-gradient(135deg,transparent 0 14px,color-mix(in srgb,var(--heat) 12%,transparent) 14px 15px),linear-gradient(160deg,var(--heat-soft),var(--bg))}
.ph svg{width:38%;height:auto;opacity:.75}

/* Tabellen */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:480px;font-size:.95rem}
th,td{text-align:left;padding:.8rem 1rem;border-bottom:1px solid var(--line)}
th{font:500 .72rem var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--bg)}
td.n{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
tr:last-child td{border-bottom:0}
.note{font-size:.85rem;color:var(--muted);margin-top:.7rem}

/* Wartungspakete */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media (max-width:860px){.plans{grid-template-columns:1fr}}
.plan{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:1.6rem;display:flex;flex-direction:column;gap:1rem}
.plan.feat{border:2px solid var(--cool)}
.plan .btn{margin-top:auto;justify-content:center}
.badge{align-self:flex-start;font:500 .68rem var(--f-mono);letter-spacing:.08em;text-transform:uppercase;padding:.3rem .55rem;border-radius:5px;background:var(--cool-soft);color:var(--cool)}

/* FAQ */
.faq{display:grid;gap:.6rem}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:0 1.2rem}
.faq summary{cursor:pointer;padding:1.05rem 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:600 1.3rem/1 var(--f-mono);color:var(--cool)}
.faq details[open] summary::after{content:"–"}
.faq details p{padding-bottom:1.1rem;color:var(--muted)}

/* Aufruf-Band */
.band{background:var(--deep);color:var(--on-deep)}
.band .wrap{display:flex;justify-content:space-between;align-items:center;gap:2rem;flex-wrap:wrap;padding-block:3rem}
.band p{color:var(--on-deep-muted);margin-top:.6rem}
.band .btn-primary{background:#5AA9E6;color:#06131B}
.band .btn-heat{background:#F07A52;color:#1A0A04}

/* Anfrage-Assistent */
.config{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:clamp(1.2rem,3vw,2rem);display:grid;gap:1.5rem}
.progress{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:.4rem}
.progress i{height:4px;border-radius:2px;background:var(--line)}
.progress i.on{background:var(--cool)}
.stepnote{font:500 .78rem var(--f-mono);color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.cstep h2{font-size:1.4rem;margin:.4rem 0 1rem}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.7rem}
.opt{border:2px solid var(--line);border-radius:var(--r);padding:1rem;background:var(--bg);cursor:pointer;text-align:left;display:grid;gap:.25rem;font:inherit;color:var(--ink)}
.opt:hover{border-color:var(--cool)}
.opt.on{border-color:var(--cool);background:var(--cool-soft)}
.opt small{color:var(--muted);font-size:.85rem}
.range-row{display:grid;gap:.6rem}
.range-row output{font:800 2rem var(--f-display);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--cool)}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.fields .full{grid-column:1/-1}
@media (max-width:600px){.fields{grid-template-columns:1fr}}
label.f{display:grid;gap:.35rem;font-weight:500;font-size:.92rem}
label.f input,label.f textarea{font:inherit;padding:.75rem .85rem;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);width:100%}
label.f textarea{min-height:110px;resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.cfg-nav{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.result{border-radius:var(--r);background:var(--cool-soft);padding:1.2rem 1.4rem;display:grid;gap:.4rem;margin-top:1.2rem}
.result .big{font:800 1.6rem var(--f-display);font-variant-numeric:tabular-nums}
.form-msg{border-radius:8px;padding:.8rem 1rem;background:var(--heat-soft);color:var(--ink);font-size:.95rem}
.done{text-align:center;display:grid;gap:1rem;justify-items:center;padding:2rem 0}
.done .ok{width:64px;height:64px;border-radius:50%;background:var(--cool);color:var(--on-accent);display:grid;place-items:center;font-size:2rem}
.contact-side{display:grid;gap:1.2rem;align-content:start}
.contact-side .card p{color:var(--ink)}
.contact-side .card a{color:var(--cool)}

/* Footer */
footer{background:var(--deep);color:var(--on-deep-muted);font-size:.92rem}
footer .wrap{padding-block:3.5rem 2rem;display:grid;gap:2.5rem}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
@media (max-width:860px){.fgrid{grid-template-columns:1fr 1fr}}
footer h2{font:500 .72rem var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--on-deep);margin:0 0 .9rem}
footer a{text-decoration:none;display:block;padding:.2rem 0}
footer a:hover{color:var(--on-deep)}
footer .brand{height:34px}
footer address{font-style:normal}
.fbottom{border-top:1px solid rgba(157,179,194,.2);padding-top:1.4rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;font-size:.82rem}
.fbottom nav{display:flex;gap:1.2rem}

/* Noch auszufüllende Angaben (vor Livegang entfernen) */
.todo{background:var(--heat-soft);color:var(--ink);border-radius:4px;padding:.1rem .35rem}

/* Bei „Bewegung reduzieren“ fließt die Luft nur langsam statt gar nicht */
@media (prefers-reduced-motion:reduce){.flow path{animation-duration:6s}.btn,.card{transition:none}}