/* ============================================================
   prolüftung.de — Design-System
   Mobile-first. Pastellige Komplementärfarben:
   Himmelblau/Teal (Luft) ↔ Apricot (Wärme/CTA), Mint als Stütze.
   Headlines: Fraunces · Text: Inter · alles self-hosted.
   ============================================================ */

:root{
  /* Farben — Basis */
  --bg:#f7fafc;            /* kühles Off-White */
  --surface:#ffffff;
  --ink:#1c3242;           /* tiefes Blau-Schiefer */
  --ink-soft:#48606f;
  --ink-faint:#7d919e;
  --line:#e3ecf1;

  /* Primär: Luft/Himmel */
  --air:#3d7ea6;
  --air-deep:#2b5f80;
  --air-pastel:#ddedf6;
  --air-tint:#eef6fa;

  /* Komplementär: Apricot (CTA, Wärme) */
  --warm:#e8814f;
  --warm-deep:#cf6a38;
  --warm-pastel:#fdeadd;

  /* Stütze: Mint (Erfolg/Frische) */
  --mint:#2e8b6a;
  --mint-pastel:#dcf2e8;

  /* Warnung (Schimmel/Feuchte) */
  --alert:#c2554f;
  --alert-pastel:#fbe4e2;

  --whatsapp:#25d366;

  /* Typo */
  --font-body:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-display:'Fraunces',Georgia,serif;

  /* Layout */
  --radius:16px;
  --radius-lg:24px;
  --shadow:0 1px 2px rgba(28,50,66,.05),0 6px 24px rgba(28,50,66,.07);
  --shadow-lift:0 2px 4px rgba(28,50,66,.06),0 14px 40px rgba(28,50,66,.12);
  --container:1120px;
  --gap:clamp(16px,3vw,28px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:1.0625rem;
  line-height:1.65;
  color:var(--ink);
  background:var(--bg);
  text-rendering:optimizeLegibility;
}

img,svg,video{max-width:100%;height:auto}
a{color:var(--air-deep)}
a:hover{color:var(--air)}

h1,h2,h3{font-family:var(--font-display);font-weight:600;line-height:1.15;color:var(--ink);margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5.5vw,3.4rem)}
h2{font-size:clamp(1.55rem,4vw,2.3rem)}
h3{font-size:clamp(1.2rem,3vw,1.45rem)}
h4{font-family:var(--font-body);font-weight:600;font-size:1.05rem;margin:0 0 .4em}
p{margin:0 0 1em}
.lead{font-size:clamp(1.1rem,2.5vw,1.3rem);color:var(--ink-soft);max-width:44rem}

.container{max-width:var(--container);margin-inline:auto;padding-inline:clamp(16px,4vw,32px)}
section{padding-block:clamp(48px,8vw,96px)}
.section-tight{padding-block:clamp(32px,5vw,56px)}

.kicker{
  display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;color:var(--air-deep);
  background:var(--air-pastel);border-radius:999px;padding:.35em 1em;margin-bottom:1em;
}
.kicker--warm{color:var(--warm-deep);background:var(--warm-pastel)}
.kicker--mint{color:var(--mint);background:var(--mint-pastel)}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:.6em 1.2em;border-radius:0 0 8px 0;z-index:200}
.skip-link:focus{left:0;color:#fff}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-weight:600;font-size:1rem;text-decoration:none;
  padding:.8em 1.5em;border-radius:999px;border:0;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--warm);color:#fff}
.btn-primary:hover{background:var(--warm-deep);color:#fff;box-shadow:var(--shadow-lift)}
.btn-secondary{background:var(--air-pastel);color:var(--air-deep)}
.btn-secondary:hover{background:var(--air);color:#fff}
.btn-ghost{background:transparent;color:var(--air-deep);box-shadow:inset 0 0 0 1.5px var(--line)}
.btn-ghost:hover{box-shadow:inset 0 0 0 1.5px var(--air)}

/* ---------- Header / Navigation ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(247,250,252,.85);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:16px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--font-display);font-weight:600;font-size:1.25rem;letter-spacing:-.01em}
.brand svg{flex:none}
.brand span b{color:var(--air-deep);font-weight:600}

.nav-toggle{
  margin-left:auto;display:flex;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:10px;background:none;border:0;cursor:pointer;border-radius:10px;
}
.nav-toggle span{display:block;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.nav-menu{
  display:none;position:absolute;inset:60px 0 auto 0;
  background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow-lift);
  max-height:calc(100dvh - 60px);overflow:auto;
  padding:8px 0 16px;
}
.nav-menu.is-open{display:block}
.nav-menu ul{list-style:none;margin:0;padding:0}
.nav-item > a,.nav-item > button{
  display:flex;align-items:center;justify-content:space-between;width:100%;
  padding:14px clamp(16px,4vw,32px);font:inherit;font-weight:600;color:var(--ink);
  text-decoration:none;background:none;border:0;cursor:pointer;text-align:left;
}
.nav-item > a:hover,.nav-item > button:hover{background:var(--air-tint)}
.nav-item > button .chev{transition:transform .2s ease;color:var(--ink-faint)}
.nav-item > button[aria-expanded="true"] .chev{transform:rotate(180deg)}
.subnav{display:none;background:var(--air-tint);padding-block:4px}
.subnav.is-open{display:block}
.subnav a{
  display:block;padding:10px clamp(16px,4vw,32px) 10px calc(clamp(16px,4vw,32px) + 14px);
  text-decoration:none;color:var(--ink-soft);font-size:.98rem;
}
.subnav a:hover{color:var(--air-deep);background:var(--air-pastel)}
.subnav .subnav-title{display:none}
.nav-cta{padding:12px clamp(16px,4vw,32px) 4px}
.nav-cta .btn{width:100%;justify-content:center}

/* Desktop-Navigation */
@media (min-width:960px){
  .nav-toggle{display:none}
  .nav-menu{
    display:flex;position:static;background:none;border:0;box-shadow:none;
    padding:0;margin-left:auto;overflow:visible;max-height:none;align-items:center;
  }
  .nav-menu > ul{display:flex;align-items:center;gap:2px}
  .nav-item{position:relative}
  .nav-item > a,.nav-item > button{
    width:auto;padding:.55em .9em;border-radius:999px;font-size:.95rem;gap:.35em;
  }
  .nav-item > a:hover,.nav-item > button:hover{background:var(--air-pastel)}
  .subnav{
    position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);
    min-width:240px;background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius);box-shadow:var(--shadow-lift);padding:8px;
  }
  .subnav a{padding:9px 14px;border-radius:10px}
  .nav-cta{padding:0 0 0 10px}
  .nav-cta .btn{width:auto;padding:.55em 1.2em;font-size:.95rem}
}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(175deg,var(--air-tint) 0%,var(--bg) 70%);
  padding-block:clamp(40px,7vw,88px);
  overflow:hidden;
}
.hero-grid{display:grid;gap:var(--gap);align-items:center}
@media (min-width:840px){.hero-grid{grid-template-columns:1.05fr .95fr}}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:1.6em}
.hero-note{margin-top:1.2em;font-size:.9rem;color:var(--ink-faint)}
.hero-art{margin-inline:auto;max-width:520px}

/* Wind-Animation im Hero-SVG */
.breeze{stroke-dasharray:120 600;animation:breeze 6s linear infinite}
.breeze.b2{animation-delay:2s}
.breeze.b3{animation-delay:4s}
@keyframes breeze{from{stroke-dashoffset:720}to{stroke-dashoffset:0}}
.float{animation:float 5s ease-in-out infinite}
.float.f2{animation-delay:1.4s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}

/* ---------- Karten & Grids ---------- */
.grid{display:grid;gap:var(--gap)}
@media (min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media (min-width:960px){.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:clamp(20px,3.5vw,30px);box-shadow:var(--shadow);
  transition:transform .2s ease,box-shadow .2s ease;
}
a.card{display:block;text-decoration:none;color:inherit}
a.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift);color:inherit}
.card .icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:52px;height:52px;border-radius:14px;margin-bottom:14px;
  background:var(--air-pastel);color:var(--air-deep);
}
.card .icon--warm{background:var(--warm-pastel);color:var(--warm-deep)}
.card .icon--mint{background:var(--mint-pastel);color:var(--mint)}
.card .icon--alert{background:var(--alert-pastel);color:var(--alert)}
.card h3{margin-bottom:.35em}
.card p{color:var(--ink-soft);font-size:.98rem;margin:0}
.card .more{display:inline-block;margin-top:.9em;font-weight:600;font-size:.95rem;color:var(--air-deep)}

/* ---------- Schritt-Liste (Scrollytelling light) ---------- */
.steps{counter-reset:step;display:grid;gap:var(--gap)}
@media (min-width:840px){.steps{grid-template-columns:repeat(3,1fr)}}
.step{position:relative;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.step::before{
  counter-increment:step;content:counter(step);
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:50%;margin-bottom:12px;
  background:var(--warm-pastel);color:var(--warm-deep);
  font-family:var(--font-display);font-weight:600;font-size:1.15rem;
}
.step p{color:var(--ink-soft);font-size:.98rem;margin:0}

/* Sanftes Einblenden beim Scrollen (JS setzt .is-visible) */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}

/* ---------- Produkt-Karten (Affiliate) ---------- */
.product{display:flex;flex-direction:column;gap:10px}
.product .badge{
  align-self:flex-start;font-size:.75rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
  background:var(--warm-pastel);color:var(--warm-deep);border-radius:999px;padding:.3em .9em;
}
.product .badge--mint{background:var(--mint-pastel);color:var(--mint)}
.product .specs{display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0;list-style:none}
.product .specs li{font-size:.8rem;background:var(--air-tint);color:var(--ink-soft);border-radius:8px;padding:.25em .7em}
.product .price{font-weight:700;font-size:1.1rem}
.product .btn{margin-top:auto;justify-content:center}
.affiliate-note{font-size:.85rem;color:var(--ink-faint);margin-top:1.2em}

/* ---------- Info-/Warnboxen ---------- */
.notice{border-radius:var(--radius);padding:18px 22px;margin-block:1.4em;border:1px solid transparent;font-size:.98rem}
.notice--info{background:var(--air-tint);border-color:var(--air-pastel)}
.notice--warn{background:var(--alert-pastel);border-color:#f3cbc8}
.notice--tip{background:var(--mint-pastel);border-color:#c4e6d6}
.notice p:last-child{margin:0}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin-inline:auto}
.faq details{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden;
}
.faq summary{
  padding:18px 22px;font-weight:600;cursor:pointer;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--air);flex:none;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 22px 18px;margin:0;color:var(--ink-soft)}

/* ---------- Artikel-Seiten ---------- */
.article-hero{background:linear-gradient(175deg,var(--air-tint),var(--bg));padding-block:clamp(36px,6vw,64px)}
.breadcrumbs{font-size:.85rem;color:var(--ink-faint);margin-bottom:1em}
.breadcrumbs a{color:var(--ink-faint)}
.breadcrumbs a:hover{color:var(--air-deep)}
.article{max-width:760px;margin-inline:auto}
.article h2{margin-top:1.8em}
.article h3{margin-top:1.4em}
.article ul,.article ol{padding-left:1.3em;color:var(--ink);margin:0 0 1.2em}
.article li{margin-bottom:.45em}
.article table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.95rem;display:block;overflow-x:auto}
.article th,.article td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.article th{background:var(--air-tint);font-weight:600;white-space:nowrap}
.sources{font-size:.85rem;color:var(--ink-faint);border-top:1px solid var(--line);margin-top:3em;padding-top:1.2em}
.sources ul{padding-left:1.2em;margin:.5em 0 0}
.sources a{color:var(--ink-faint);word-break:break-word}

/* ---------- CTA-Band ---------- */
.cta-band{
  background:linear-gradient(120deg,var(--air-deep),var(--air));
  border-radius:var(--radius-lg);color:#fff;
  padding:clamp(28px,5vw,48px);display:grid;gap:20px;align-items:center;
}
@media (min-width:840px){.cta-band{grid-template-columns:1.4fr auto}}
.cta-band h2{color:#fff;margin:0 0 .3em}
.cta-band p{color:rgba(255,255,255,.85);margin:0}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#b9c8d2;padding-block:clamp(40px,6vw,64px);margin-top:24px;font-size:.95rem}
.footer-grid{display:grid;gap:32px}
@media (min-width:840px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:.8em}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.5em}
.site-footer a{color:#b9c8d2;text-decoration:none}
.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;font-size:.85rem;color:#8ba0ad;display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between}

/* ---------- WhatsApp-Button (schwebend) ---------- */
.whatsapp-fab{
  position:fixed;right:16px;bottom:16px;z-index:90;
  width:56px;height:56px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--whatsapp);box-shadow:0 4px 16px rgba(0,0,0,.22);
  transition:transform .15s ease;
}
.whatsapp-fab:hover{transform:scale(1.07)}
.whatsapp-fab svg{width:30px;height:30px;fill:#fff}

/* ---------- Utilities ---------- */
.center{text-align:center}
.mt-0{margin-top:0}.mb-2{margin-bottom:2rem}
.section-head{max-width:640px;margin-bottom:clamp(28px,4vw,44px)}
.section-head.center{margin-inline:auto}