/* ===== WÄRMEWERK — SHK/Heizung Demo =====
   Prinzip: Temperatur. Globaler Wert --t (0 = eiskalt/blau, 1 = warm/rot-orange)
   steuert Akzentfarbe, Verläufe und Stimmung der ganzen Seite. */

@font-face{font-family:'Sora';src:url('assets/fonts/sora-var.woff2') format('woff2');font-weight:400 800;font-display:swap}
@font-face{font-family:'IBM Plex Sans';src:url('assets/fonts/ibmplexsans-var.woff2') format('woff2');font-weight:100 700;font-display:swap}

:root{
  --t:.85;
  --bg:#0a0e14;
  --bg-2:#0e141d;
  --panel:#121a26;
  --ink:#eef3f8;
  --ink-soft:#93a1b3;
  --line:rgba(238,243,248,.12);
  --cold:#57b8ff;
  --warm:#ff6a2b;
  --acc:#c9946b; /* wird per JS aus --t gesetzt */
  --acc-soft:rgba(201,148,107,.16);
  --font-h:'Sora',sans-serif;
  --font-b:'IBM Plex Sans',sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-b);background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
::selection{background:var(--acc);color:#0a0e14}

/* ---------- NAV ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;justify-content:space-between;align-items:center;padding:1rem clamp(1.2rem,4vw,3rem);transition:background .4s,box-shadow .4s,backdrop-filter .4s}
.nav.is-scrolled{background:rgba(10,14,20,.78);backdrop-filter:blur(14px);box-shadow:0 1px 0 var(--line)}
.brand{font-family:var(--font-h);font-weight:800;font-size:1.1rem;letter-spacing:.05em}
.brand span{display:block;font-family:var(--font-b);font-weight:500;font-size:.58rem;letter-spacing:.3em;text-transform:uppercase;color:var(--ink-soft)}
.nav-links{display:flex;gap:1.8rem;align-items:center;font-size:.9rem;font-weight:500}
.nav-links a:not(.nav-cta){position:relative}
.nav-links a:not(.nav-cta)::after{content:'';position:absolute;left:0;bottom:-4px;width:100%;height:1.5px;background:var(--acc);transform:scaleX(0);transform-origin:right;transition:transform .35s var(--ease)}
.nav-links a:not(.nav-cta):hover::after{transform:scaleX(1);transform-origin:left}
.nav-cta{background:var(--acc);color:#0a0e14;padding:.55rem 1.25rem;border-radius:99px;font-weight:600;transition:filter .3s,transform .3s var(--ease)}
.nav-cta:hover{filter:brightness(1.12);transform:translateY(-1px)}
.nav-burger{display:none;flex-direction:column;gap:6px;padding:.5rem}
.nav-burger span{width:24px;height:2px;background:var(--ink);transition:transform .3s var(--ease),opacity .3s}
.nav.menu-open .nav-burger span:first-child{transform:translateY(4px) rotate(45deg)}
.nav.menu-open .nav-burger span:last-child{transform:translateY(-4px) rotate(-45deg)}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:center;overflow:hidden;padding:clamp(5rem,10vh,7rem) clamp(1.4rem,5vw,4rem) clamp(9rem,16vh,11rem)}
.hero-imgs{position:absolute;inset:0}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-kalt{filter:saturate(.85) brightness(.9)}
.hero-warm{opacity:var(--t);will-change:opacity}
.hero-grade{position:absolute;inset:0;background:
  linear-gradient(180deg,rgba(10,14,20,.62) 0%,rgba(10,14,20,.18) 34%,rgba(10,14,20,.24) 60%,rgba(10,14,20,.88) 100%),
  linear-gradient(100deg,rgba(87,184,255,calc(.22 * (1 - var(--t)))) 0%,transparent 45%,rgba(255,106,43,calc(.26 * var(--t))) 100%)}
.hero-particles{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}

.hero-ui{position:relative;z-index:3;max-width:60rem}
.hero-tag{font-size:.72rem;letter-spacing:.34em;text-transform:uppercase;font-weight:600;color:var(--acc);margin-bottom:1.1rem}
.hero-title{font-family:var(--font-h);font-weight:800;font-size:clamp(2.9rem,8.5vw,7.2rem);line-height:.98;letter-spacing:-.025em;text-shadow:0 2px 30px rgba(0,0,0,.35)}
.ht-line{display:block;overflow:hidden}
.ht-line>* , .ht-line{display:inline-block}
.hero-title em{font-style:normal;background:linear-gradient(92deg,var(--cold),var(--acc) 55%,var(--warm));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin-top:1.3rem;font-size:clamp(1.02rem,1.7vw,1.3rem);color:rgba(238,243,248,.92);max-width:32rem;text-shadow:0 1px 16px rgba(0,0,0,.4)}
.hero-ctas{display:flex;gap:1rem;flex-wrap:wrap;margin-top:2.1rem}
.btn-primary{background:var(--acc);color:#0a0e14;font-weight:600;padding:.85rem 1.7rem;border-radius:99px;transition:filter .3s,transform .3s var(--ease);box-shadow:0 8px 30px -8px var(--acc)}
.btn-primary:hover{filter:brightness(1.12);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(238,243,248,.35);color:var(--ink);padding:.85rem 1.6rem;border-radius:99px;backdrop-filter:blur(6px);transition:border-color .3s,background .3s}
.btn-ghost:hover{border-color:var(--acc);background:rgba(255,255,255,.06)}

/* Thermostat-Regler */
.thermo{position:absolute;left:50%;bottom:clamp(1.2rem,3.5vh,2.4rem);transform:translateX(-50%);z-index:4;width:min(560px,92vw);background:rgba(10,14,20,.55);border:1px solid var(--line);border-radius:22px;padding:1rem 1.3rem 1.1rem;backdrop-filter:blur(16px)}
.thermo-state{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:.55rem}
.thermo-word{font-family:var(--font-h);font-weight:700;font-size:1.02rem;letter-spacing:.01em}
.thermo-deg{font-family:var(--font-h);font-weight:800;font-size:1.5rem;color:var(--acc)}
.thermo-deg i{font-style:normal;font-size:.85rem;font-weight:600;margin-left:.1em;color:var(--ink-soft)}
.thermo-track-wrap{display:flex;align-items:center;gap:.8rem}
.thermo-end{font-size:.75rem;font-weight:600;color:var(--ink-soft)}
.thermo-cold{color:var(--cold)}
.thermo-hot{color:var(--warm)}
.thermo-slider{flex:1;appearance:none;-webkit-appearance:none;height:8px;border-radius:99px;background:linear-gradient(90deg,var(--cold),#c47ab0,var(--warm));outline:none;cursor:grab}
.thermo-slider:active{cursor:grabbing}
.thermo-slider::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:var(--ink);border:3px solid var(--acc);box-shadow:0 0 0 6px rgba(255,255,255,.12),0 4px 14px rgba(0,0,0,.5);transition:transform .2s var(--ease)}
.thermo-slider::-webkit-slider-thumb:hover{transform:scale(1.12)}
.thermo-slider::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:var(--ink);border:3px solid var(--acc);box-shadow:0 0 0 6px rgba(255,255,255,.12)}
.thermo-slider:focus-visible{outline:2px solid var(--acc);outline-offset:4px}
.thermo-hint{margin-top:.55rem;font-size:.74rem;color:var(--ink-soft);text-align:center}

/* ---------- MARQUEE ---------- */
.marquee{background:linear-gradient(90deg,var(--cold),var(--warm));color:#0a0e14;overflow:hidden;padding:.85rem 0;white-space:nowrap}
.marquee-track{display:inline-flex;animation:mq 24s linear infinite;font-family:var(--font-h);font-weight:700;font-size:1rem;letter-spacing:.05em}
@keyframes mq{to{transform:translateX(-50%)}}

/* ---------- SECTIONS ---------- */
section{padding:clamp(4.5rem,10vw,8.5rem) clamp(1.4rem,5vw,4rem)}
.kicker{font-size:.72rem;letter-spacing:.3em;text-transform:uppercase;font-weight:600;color:var(--acc);margin-bottom:1.2rem}
h2{font-family:var(--font-h);font-weight:800;font-size:clamp(1.9rem,4.4vw,3.4rem);line-height:1.08;letter-spacing:-.02em;margin-bottom:2.4rem}
h2 em{font-style:normal;color:var(--ink-soft);font-weight:500;font-size:.62em;display:inline-block}

.manifesto{max-width:74rem}
.manifesto-text{font-family:var(--font-h);font-weight:700;font-size:clamp(1.6rem,3.8vw,3rem);line-height:1.18;letter-spacing:-.015em}
.manifesto-text .w{display:inline-block;opacity:.12;transform:translateY(.35em);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.manifesto-text .w.on{opacity:1;transform:none}
.manifesto-sub{margin-top:1.8rem;max-width:38rem;color:var(--ink-soft);font-size:1.05rem}

/* ---------- FLOW (Rohre) ---------- */
.flow{background:var(--bg-2)}
.flow-stage{max-width:76rem}
.flow-svg{width:100%;height:auto;display:block}
.pipe-base{stroke:rgba(238,243,248,.14);stroke-width:10;stroke-linecap:round;fill:none}
.pipe-flow{stroke:url(#pipeGrad);stroke-width:10;stroke-linecap:round;fill:none;stroke-dasharray:24 18;animation:flow 1.6s linear infinite;filter:drop-shadow(0 0 8px rgba(255,140,80,.35))}
@keyframes flow{to{stroke-dashoffset:-42}}
.flow-dot{fill:var(--bg);stroke:url(#pipeGrad);stroke-width:4}
.flow-stations{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:1.6rem}
.station{border:1px solid var(--line);border-radius:16px;padding:1.2rem 1.3rem;background:rgba(238,243,248,.03)}
.station b{font-family:var(--font-h);font-weight:700;font-size:1rem}
.station p{margin-top:.4rem;font-size:.9rem;color:var(--ink-soft)}

/* ---------- LEISTUNGEN ---------- */
.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.scard{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:22px;overflow:hidden;transition:transform .4s var(--ease),border-color .4s,box-shadow .4s}
.scard:hover{transform:translateY(-6px);border-color:var(--acc);box-shadow:0 24px 50px -24px var(--acc-soft),0 0 0 1px var(--acc-soft)}
.scard-img{position:relative;aspect-ratio:3/2;overflow:hidden}
.scard-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.scard:hover .scard-img img{transform:scale(1.06)}
.scard-img figcaption{position:absolute;left:.7rem;bottom:.55rem;font-size:.62rem;letter-spacing:.06em;color:rgba(255,255,255,.75);background:rgba(10,14,20,.55);padding:.18rem .55rem;border-radius:99px;backdrop-filter:blur(6px)}
.scard-body{padding:1.3rem 1.35rem 1.45rem;display:flex;flex-direction:column;gap:.45rem;flex:1}
.s-num{font-family:var(--font-h);font-weight:700;font-size:.78rem;color:var(--acc)}
.scard-body h3{font-family:var(--font-h);font-weight:700;font-size:1.35rem;letter-spacing:-.01em}
.scard-body p{font-size:.92rem;color:var(--ink-soft);flex:1}
.s-more{font-size:.85rem;font-weight:600;color:var(--acc);margin-top:.4rem}

/* ---------- VORHER/NACHHER ---------- */
.compare{background:var(--bg-2)}
.ba{position:relative;max-width:72rem;aspect-ratio:16/9;border-radius:22px;overflow:hidden;border:1px solid var(--line);user-select:none;touch-action:pan-y}
.ba-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none}
.ba-before-wrap{position:absolute;inset:0;clip-path:inset(0 calc(100% - var(--ba,50%)) 0 0)}
.ba-before-wrap .ba-img{filter:saturate(.8) brightness(.92)}
.ba-line{position:absolute;top:0;bottom:0;left:var(--ba,50%);width:2px;background:#fff;box-shadow:0 0 24px rgba(0,0,0,.5);transform:translateX(-1px)}
.ba-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.94);color:#111;display:grid;place-items:center;font-size:1.1rem;font-weight:700;box-shadow:0 6px 18px rgba(0,0,0,.4)}
.ba-tag{position:absolute;top:1rem;font-size:.72rem;font-weight:600;letter-spacing:.08em;padding:.3rem .8rem;border-radius:99px;background:rgba(10,14,20,.6);backdrop-filter:blur(6px)}
.ba-tag-before{left:1rem;color:var(--cold)}
.ba-tag-after{right:1rem;color:var(--warm)}
.ba-range{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize;margin:0}
.ba-note{position:absolute;right:.8rem;bottom:.55rem;font-size:.62rem;color:rgba(255,255,255,.7);background:rgba(10,14,20,.55);padding:.16rem .55rem;border-radius:99px;backdrop-filter:blur(6px)}

/* ---------- ZAHLEN ---------- */
.facts{padding-top:clamp(3rem,7vw,5.5rem);padding-bottom:clamp(3rem,7vw,5.5rem)}
.facts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}
.fact{border-left:2px solid var(--acc);padding-left:1.1rem}
.fact b{display:block;font-family:var(--font-h);font-weight:800;font-size:clamp(2rem,4vw,3rem);letter-spacing:-.02em;color:var(--ink)}
.fact span{font-size:.88rem;color:var(--ink-soft)}

/* ---------- ANFRAGE ---------- */
.inquiry{background:linear-gradient(160deg,var(--bg-2),#151009);border-top:1px solid var(--line)}
.inquiry-inner{max-width:44rem}
.iq-card{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:2rem clamp(1.3rem,3vw,2.2rem) 2.2rem;overflow:hidden}
.iq-progress{position:absolute;top:0;left:0;right:0;height:3px;background:rgba(238,243,248,.08)}
.iq-pfill{display:block;height:100%;width:25%;background:linear-gradient(90deg,var(--cold),var(--warm));transition:width .45s var(--ease)}
.iq-step{display:none}
.iq-step.is-active{display:block;animation:iqIn .45s var(--ease)}
@keyframes iqIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.iq-q{font-family:var(--font-h);font-weight:700;font-size:1.3rem;margin-bottom:1.3rem}
.iq-opts{display:flex;flex-direction:column;gap:.7rem}
.iq-opt{text-align:left;border:1px solid var(--line);border-radius:14px;padding:.95rem 1.2rem;font-size:.98rem;font-weight:500;background:rgba(238,243,248,.03);transition:border-color .25s,background .25s,transform .25s var(--ease)}
.iq-opt:hover{border-color:var(--acc);background:var(--acc-soft);transform:translateX(4px)}
.iq-form{display:flex;flex-direction:column;gap:.7rem}
.iq-form input{background:rgba(238,243,248,.05);border:1px solid var(--line);border-radius:14px;padding:.95rem 1.2rem;color:var(--ink);font:inherit}
.iq-form input::placeholder{color:var(--ink-soft)}
.iq-form input:focus{outline:none;border-color:var(--acc)}
.iq-submit{background:var(--acc);color:#0a0e14;font-weight:700;border-radius:14px;padding:1rem;font-size:1rem;transition:filter .3s}
.iq-submit:hover{filter:brightness(1.12)}
.iq-back{margin-top:1rem;font-size:.85rem;color:var(--ink-soft)}
.iq-back:hover{color:var(--ink)}
.iq-done{text-align:center;padding:1.4rem 0}
.iq-check{width:60px;height:60px;margin:0 auto 1rem;border-radius:50%;background:linear-gradient(135deg,var(--cold),var(--warm));color:#0a0e14;font-size:1.6rem;font-weight:800;display:grid;place-items:center}
.iq-note{color:var(--ink-soft);font-size:.9rem;max-width:26rem;margin:0 auto}

/* ---------- FOOTER ---------- */
.footer{border-top:1px solid var(--line);padding:clamp(3rem,6vw,4.5rem) clamp(1.4rem,5vw,4rem) 2.4rem;background:var(--bg)}
.f-top{display:flex;justify-content:space-between;gap:2rem;flex-wrap:wrap;margin-bottom:2.2rem}
.f-contact p{font-size:.92rem;color:var(--ink-soft)}
.f-legal{display:flex;gap:1.4rem;align-items:flex-start}
.f-legal-link{font-size:.9rem;color:var(--ink-soft);border-bottom:1px solid transparent;transition:color .25s,border-color .25s}
.f-legal-link:hover{color:var(--ink);border-color:var(--acc)}
.f-note{font-size:.78rem;color:var(--ink-soft);max-width:52rem}

/* ---------- MODALS ---------- */
.modal{position:fixed;inset:0;z-index:200;display:grid;place-items:center;background:rgba(6,9,13,.7);backdrop-filter:blur(8px);padding:1.2rem}
.modal[hidden]{display:none}
.modal-card{position:relative;max-width:34rem;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:2rem;max-height:82vh;overflow:auto}
.modal-card h3{font-family:var(--font-h);font-weight:800;font-size:1.3rem;margin-bottom:1rem;display:flex;align-items:center;gap:.7rem}
.modal-draft{font-family:var(--font-b);font-size:.62rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--warm);border:1px solid var(--warm);border-radius:99px;padding:.2rem .6rem}
.modal-card p{font-size:.92rem;color:var(--ink-soft);margin-bottom:.9rem}
.modal-note{font-size:.8rem;border-top:1px solid var(--line);padding-top:.9rem}
.modal-close{position:absolute;top:.9rem;right:1rem;font-size:1.5rem;color:var(--ink-soft);line-height:1}
.modal-close:hover{color:var(--ink)}

/* ---------- REVEAL ---------- */
[data-reveal]{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
[data-reveal].in{opacity:1;transform:none}

/* ---------- RESPONSIVE ---------- */
@media(max-width:900px){
  .service-grid{grid-template-columns:1fr}
  .flow-stations{grid-template-columns:1fr}
  .facts-grid{grid-template-columns:repeat(2,1fr)}
  .nav-links{position:fixed;inset:0;background:rgba(10,14,20,.96);backdrop-filter:blur(20px);flex-direction:column;justify-content:center;gap:2rem;font-size:1.3rem;opacity:0;pointer-events:none;transition:opacity .35s}
  .nav.menu-open .nav-links{opacity:1;pointer-events:auto}
  .nav-burger{display:flex;z-index:101}
  .hero{padding-bottom:12.5rem}
  .ba{aspect-ratio:4/3}
}
@media(max-width:560px){
  .facts-grid{grid-template-columns:1fr 1fr;gap:1rem}
  .hero-ctas .btn-ghost{display:none}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}