/* ============================================================
   Mieterstrom-Wissen — Design System
   Editorial / Solar: Pinie-Grün + Solar-Amber auf warmem Creme
   ============================================================ */

:root{
  --bg:        #FBF7EE;   /* warm cream */
  --bg-alt:    #F3EEE0;   /* deeper cream for sections */
  --card:      #FFFFFF;
  --ink:       #18211B;   /* near-black green */
  --ink-soft:  #44524A;   /* muted body */
  --green:     #1E4D34;   /* primary pine */
  --green-700: #163B28;
  --green-900: #0E2A1C;
  --green-50:  #E7EFE9;
  --gold:      #E59A2E;   /* solar amber */
  --gold-700:  #C97F18;
  --gold-50:   #FBEBCF;
  --sage:      #6F8B7A;
  --line:      #E2D9C6;   /* hairline on cream */
  --line-2:    #D6CBB4;
  --danger:    #B4451F;

  --radius:    14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(24,33,27,.06), 0 2px 6px rgba(24,33,27,.05);
  --shadow:    0 6px 18px rgba(24,33,27,.08), 0 2px 6px rgba(24,33,27,.05);
  --shadow-lg: 0 24px 60px rgba(14,42,28,.16);

  --ff-display: "Fraunces", Georgia, "Times New Roman", serif;
  --ff-body:    "IBM Plex Sans", system-ui, -apple-system, Segoe UI, sans-serif;

  --maxw: 1140px;
  --maxw-narrow: 760px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--ff-body); font-size:1.02rem; line-height:1.68;
  font-feature-settings:"kern","liga","tnum" 0;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{ max-width:100%; height:auto; display:block; }
a{ color:var(--green); text-decoration:none; }
a:hover{ color:var(--gold-700); }

h1,h2,h3,h4{ font-family:var(--ff-display); font-weight:600; line-height:1.12;
  color:var(--ink); letter-spacing:-.01em; margin:0 0 .5em;
  overflow-wrap:break-word; word-break:break-word; -webkit-hyphens:auto; hyphens:auto; }
h1{ font-size:clamp(2.1rem,5.2vw,3.5rem); font-weight:600; }
h2{ font-size:clamp(1.6rem,3.6vw,2.4rem); }
h3{ font-size:clamp(1.2rem,2.2vw,1.5rem); }
h4{ font-size:1.08rem; font-family:var(--ff-body); font-weight:600; }
p{ margin:0 0 1.1em; }
strong{ font-weight:600; color:var(--ink); }
small{ font-size:.84rem; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 22px; }
.narrow{ max-width:var(--maxw-narrow); margin-left:auto; margin-right:auto; }
section{ padding:clamp(46px,7vw,86px) 0; }
.section-alt{ background:var(--bg-alt); }
.section-green{ background:var(--green-900); color:#EAF1EB; }
.section-green h1,.section-green h2,.section-green h3{ color:#fff; }

/* ---------- Eyebrow / kicker ---------- */
.kicker{ display:inline-flex; align-items:center; gap:.5em;
  font-family:var(--ff-body); font-weight:600; font-size:.78rem;
  letter-spacing:.14em; text-transform:uppercase; color:var(--gold-700);
  margin:0 0 .9em; }
.kicker::before{ content:""; width:26px; height:2px; background:var(--gold); border-radius:2px; }
.section-green .kicker{ color:var(--gold); }

.lead{ font-size:1.18rem; color:var(--ink-soft); line-height:1.6; }
.section-green .lead{ color:#C7D6CB; }

/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header{ position:sticky; top:0; z-index:50;
  background:rgba(251,247,238,.86); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line); }
.nav{ display:flex; align-items:center; gap:18px;
  max-width:var(--maxw); margin:0 auto; padding:13px 22px; }
.brand{ display:flex; align-items:center; gap:11px; font-family:var(--ff-display);
  font-weight:600; font-size:1.22rem; color:var(--ink); letter-spacing:-.01em; }
.brand:hover{ color:var(--ink); }
.brand .mark{ width:32px; height:32px; flex:0 0 auto; }
.brand b{ color:var(--green); font-weight:600; }
.brand .dot{ color:var(--gold); }

.nav-links{ display:flex; align-items:center; gap:4px; margin-left:auto; list-style:none; padding:0; }
.nav-links a{ display:block; padding:9px 13px; border-radius:9px; color:var(--ink-soft);
  font-weight:500; font-size:.96rem; transition:.18s; }
.nav-links a:hover{ background:var(--green-50); color:var(--green); }
.nav-links li.current > a{ color:var(--green); background:var(--green-50); }

/* dropdown */
.has-dd{ position:relative; }
.has-dd > a::after{ content:"▾"; font-size:.7em; margin-left:.4em; opacity:.6; }
.dd{ position:absolute; top:100%; left:0; min-width:280px; background:var(--card);
  border:1px solid var(--line); border-radius:14px; box-shadow:var(--shadow-lg);
  padding:8px; opacity:0; visibility:hidden; transform:translateY(6px);
  transition:.18s; list-style:none; margin:6px 0 0; }
.has-dd:hover .dd, .has-dd:focus-within .dd{ opacity:1; visibility:visible; transform:translateY(0); }
.dd a{ padding:10px 12px; border-radius:9px; color:var(--ink); font-size:.92rem; }
.dd a:hover{ background:var(--green-50); color:var(--green); }
.dd .dd-group{ padding:10px 12px 4px; font-size:.72rem; font-weight:600; letter-spacing:.08em;
  text-transform:uppercase; color:var(--gold-700); }
.dd .dd-group:not(:first-child){ border-top:1px solid var(--line); margin-top:4px; }

.btn{ display:inline-flex; align-items:center; gap:.55em; cursor:pointer;
  font-family:var(--ff-body); font-weight:600; font-size:.98rem; line-height:1;
  padding:13px 22px; border-radius:11px; border:1.5px solid transparent;
  transition:.18s; text-align:center; }
.btn-primary{ background:var(--gold); color:#241704; box-shadow:0 6px 16px rgba(229,154,46,.32); }
.btn-primary:hover{ background:var(--gold-700); color:#fff; transform:translateY(-1px); }
.btn-green{ background:var(--green); color:#fff; }
.btn-green:hover{ background:var(--green-700); color:#fff; transform:translateY(-1px); }
.btn-ghost{ background:transparent; color:var(--green); border-color:var(--line-2); }
.btn-ghost:hover{ border-color:var(--green); background:var(--green-50); }
.btn-lg{ padding:16px 28px; font-size:1.05rem; }
.nav .btn{ margin-left:6px; }

.nav-toggle{ display:none; margin-left:auto; background:none; border:1.5px solid var(--line-2);
  border-radius:9px; padding:9px 11px; cursor:pointer; color:var(--ink); }
.nav-toggle svg{ width:22px; height:22px; display:block; }

@media(max-width:980px){
  .nav-toggle{ display:inline-flex; }
  .nav-links{ position:fixed; inset:62px 0 auto 0; flex-direction:column; align-items:stretch;
    gap:2px; background:var(--bg); border-bottom:1px solid var(--line); padding:14px 18px 22px;
    margin:0; box-shadow:var(--shadow); transform:translateY(-120%); transition:.28s; }
  .nav-links.open{ transform:translateY(0); }
  .nav-links a{ padding:13px 12px; font-size:1.05rem; }
  .dd{ position:static; opacity:1; visibility:visible; transform:none; box-shadow:none;
    border:none; border-left:2px solid var(--line); border-radius:0; margin:2px 0 6px 12px; padding:0; }
  .has-dd > a::after{ float:right; }
  .nav .btn{ margin:8px 0 0; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero{ position:relative; overflow:hidden;
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(229,154,46,.20), transparent 55%),
    radial-gradient(80% 70% at 0% 100%, rgba(30,77,52,.10), transparent 60%),
    var(--bg);
  padding:clamp(48px,7vw,92px) 0 clamp(40px,6vw,72px); }
.hero-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:48px; align-items:center; }
.hero h1{ margin-bottom:.4em; }
.hero h1 em{ font-style:italic; color:var(--green); }
.hero-cta{ display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.hero-trust{ display:flex; flex-wrap:wrap; gap:18px 26px; margin-top:30px;
  padding-top:24px; border-top:1px solid var(--line); }
.hero-trust div{ font-size:.92rem; color:var(--ink-soft); }
.hero-trust b{ display:block; font-family:var(--ff-display); font-size:1.5rem; color:var(--green); line-height:1; margin-bottom:3px; }

.hero-card{ background:var(--card); border:1px solid var(--line); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg); padding:26px; }
.hero-illu{ display:flex; align-items:flex-end; justify-content:center; gap:8px; height:150px; margin-bottom:18px;
  background:linear-gradient(180deg,#EAF1EB,#fff); border-radius:14px; padding:18px; }

@media(max-width:860px){ .hero-grid{ grid-template-columns:1fr; gap:32px; } }

/* ============================================================
   Cards & grids
   ============================================================ */
.grid{ display:grid; gap:22px; }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
@media(max-width:900px){ .grid-3,.grid-4{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:620px){ .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; } }

.card{ background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:26px; box-shadow:var(--shadow-sm); transition:.2s; }
.card:hover{ box-shadow:var(--shadow); transform:translateY(-2px); border-color:var(--line-2); }
.card h3{ margin-bottom:.4em; }
.card p:last-child{ margin-bottom:0; }
.card .ico{ width:46px; height:46px; border-radius:12px; display:grid; place-items:center;
  background:var(--green-50); color:var(--green); margin-bottom:16px; }
.card .ico svg{ width:24px; height:24px; }

.badge{ display:inline-block; font-size:.72rem; font-weight:600; letter-spacing:.06em;
  text-transform:uppercase; color:var(--gold-700); background:var(--gold-50);
  padding:4px 10px; border-radius:999px; }
.badge.green{ color:var(--green); background:var(--green-50); }

/* feature list */
.checks{ list-style:none; padding:0; margin:0; }
.checks li{ position:relative; padding:7px 0 7px 32px; }
.checks li::before{ content:""; position:absolute; left:0; top:11px; width:18px; height:18px;
  border-radius:50%; background:var(--green-50);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231E4D34' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
  background-size:12px; background-repeat:no-repeat; background-position:center; }

/* ============================================================
   Blog / article
   ============================================================ */
.post-meta{ display:flex; flex-wrap:wrap; gap:14px; align-items:center; color:var(--ink-soft);
  font-size:.9rem; margin:18px 0 0; }
.post-meta .badge{ margin:0; }

.article{ font-size:1.08rem; }
.article h2{ margin-top:1.6em; scroll-margin-top:90px; }
.article h3{ margin-top:1.3em; scroll-margin-top:90px; }
.article ul,.article ol{ margin:0 0 1.2em; padding-left:1.3em; }
.article li{ margin:.4em 0; }
.article a{ text-decoration:underline; text-underline-offset:3px; text-decoration-color:var(--line-2); }
.article a:hover{ text-decoration-color:var(--gold); }

.toc{ background:var(--green-50); border:1px solid #CFE0D4; border-radius:var(--radius);
  padding:22px 24px; margin:0 0 30px; }
.toc strong{ display:block; font-family:var(--ff-display); font-size:1.05rem; margin-bottom:10px; color:var(--green-900); }
.toc ol{ margin:0; padding-left:1.3em; columns:2; column-gap:30px; }
.toc li{ margin:.3em 0; break-inside:avoid; }
.toc a{ color:var(--green-700); }
@media(max-width:620px){ .toc ol{ columns:1; } }

.callout{ border-left:4px solid var(--gold); background:var(--gold-50);
  padding:18px 22px; border-radius:0 12px 12px 0; margin:1.6em 0; }
.callout.green{ border-color:var(--green); background:var(--green-50); }
.callout p:last-child{ margin-bottom:0; }
.callout strong{ color:var(--green-900); }

.keyfacts{ background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:8px 24px; margin:1.6em 0; box-shadow:var(--shadow-sm); }
.keyfacts dt{ font-weight:600; color:var(--green-900); padding-top:14px; }
.keyfacts dd{ margin:0 0 14px; color:var(--ink-soft); border-bottom:1px solid var(--line); padding-bottom:14px; }
.keyfacts > div:last-child dd{ border-bottom:none; }

/* tables */
.tbl-wrap{ overflow-x:auto; margin:1.6em 0; border:1px solid var(--line); border-radius:var(--radius); }
table{ border-collapse:collapse; width:100%; font-size:.96rem; background:var(--card); }
th,td{ text-align:left; padding:13px 16px; border-bottom:1px solid var(--line); vertical-align:top; }
thead th{ background:var(--green-900); color:#fff; font-weight:600; font-size:.9rem; }
tbody tr:last-child td{ border-bottom:none; }
tbody tr:nth-child(even){ background:#FCFAF4; }
td .yes{ color:var(--green); font-weight:600; }
td .no{ color:var(--danger); font-weight:600; }

.cost-table td:last-child,.cost-table th:last-child{ text-align:right; font-variant-numeric:tabular-nums; white-space:nowrap; }

/* blog cards */
.post-card{ display:flex; flex-direction:column; background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow-sm); transition:.2s; }
.post-card:hover{ box-shadow:var(--shadow); transform:translateY(-3px); }
.post-card .pc-top{ height:8px; background:linear-gradient(90deg,var(--gold),var(--green)); }
.post-card .pc-body{ padding:22px 24px 26px; display:flex; flex-direction:column; flex:1; }
.post-card h3{ font-size:1.22rem; margin:12px 0 .4em; }
.post-card h3 a{ color:var(--ink); }
.post-card h3 a:hover{ color:var(--green); }
.post-card p{ color:var(--ink-soft); font-size:.98rem; }
.post-card .more{ margin-top:auto; font-weight:600; font-size:.92rem; padding-top:10px; }

/* ============================================================
   Calculator
   ============================================================ */
.calc{ background:var(--card); border:1px solid var(--line); border-radius:var(--radius-lg);
  box-shadow:var(--shadow); overflow:hidden; }
.calc-grid{ display:grid; grid-template-columns:1fr 1fr; }
@media(max-width:820px){ .calc-grid{ grid-template-columns:1fr; } }
.calc-inputs{ padding:30px 32px; border-right:1px solid var(--line); }
@media(max-width:820px){ .calc-inputs{ border-right:none; border-bottom:1px solid var(--line); } }
.calc-out{ padding:30px 32px; background:var(--green-900); color:#EAF1EB; }
.calc-out h3{ color:#fff; }

.field{ margin-bottom:20px; }
.field label{ display:flex; justify-content:space-between; align-items:baseline;
  font-weight:600; font-size:.94rem; margin-bottom:7px; color:var(--green-900); }
.field .val{ font-family:var(--ff-display); font-size:1.05rem; color:var(--gold-700); }
.field input[type=range]{ width:100%; accent-color:var(--gold); height:6px; }
.field input[type=number]{ width:100%; padding:11px 13px; border:1.5px solid var(--line-2);
  border-radius:10px; font-family:var(--ff-body); font-size:1rem; background:#fff; color:var(--ink); }
.field input:focus{ outline:none; border-color:var(--green); }
.field .hint{ font-size:.82rem; color:var(--ink-soft); margin-top:5px; }

.result-row{ display:flex; justify-content:space-between; align-items:baseline; gap:10px;
  padding:13px 0; border-bottom:1px solid rgba(255,255,255,.14); }
.result-row:last-of-type{ border-bottom:none; }
.result-row .rl{ color:#BFD2C4; font-size:.94rem; }
.result-row .rv{ font-family:var(--ff-display); font-size:1.25rem; color:#fff; white-space:nowrap;
  font-variant-numeric:tabular-nums; }
.result-row.big .rv{ font-size:1.9rem; color:var(--gold); }
.result-row.big .rl{ color:#EAF1EB; font-weight:600; }
.calc-out .disc{ font-size:.8rem; color:#9DB6A5; margin-top:16px; line-height:1.5; }

/* ============================================================
   CTA / Contact
   ============================================================ */
.cta-band{ background:linear-gradient(135deg,var(--green-900),var(--green)); color:#fff;
  border-radius:var(--radius-lg); padding:clamp(34px,5vw,56px); text-align:center;
  position:relative; overflow:hidden; isolation:isolate; }
.cta-band::after{ content:""; position:absolute; right:-70px; top:-70px; width:200px; height:200px;
  z-index:0; pointer-events:none;
  background:radial-gradient(circle,rgba(229,154,46,.32),transparent 70%); }
.cta-band h2{ color:#fff; position:relative; z-index:1; }
.cta-band p{ color:#C7D6CB; max-width:560px; margin:0 auto 26px; position:relative; z-index:1; }
.cta-band .btn{ position:relative; z-index:1; }

.form{ display:grid; gap:16px; }
.form .row{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
@media(max-width:620px){ .form .row{ grid-template-columns:1fr; } }
.form label{ font-weight:600; font-size:.9rem; display:block; margin-bottom:6px; color:var(--green-900); }
.form .req{ color:var(--gold-700); }
.form input,.form select,.form textarea{ width:100%; padding:13px 14px; border:1.5px solid var(--line-2);
  border-radius:10px; font-family:var(--ff-body); font-size:1rem; background:#fff; color:var(--ink); }
.form input:focus,.form select:focus,.form textarea:focus{ outline:none; border-color:var(--green);
  box-shadow:0 0 0 3px var(--green-50); }
.form textarea{ min-height:130px; resize:vertical; }
.form .consent{ display:flex; gap:11px; align-items:flex-start; font-size:.88rem; color:var(--ink-soft); line-height:1.5; cursor:pointer; }
.form .consent input[type=checkbox]{ width:18px; height:18px; min-width:18px; flex:0 0 18px; margin:2px 0 0; accent-color:var(--green); cursor:pointer; }
.form .consent .consent-text{ flex:1 1 auto; }
.form .consent a{ color:var(--green); text-decoration:underline; text-underline-offset:2px; }
.hp{ position:absolute; left:-9999px; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer{ background:var(--green-900); color:#C7D6CB; padding:56px 0 28px; margin-top:0; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:34px; }
@media(max-width:860px){ .foot-grid{ grid-template-columns:1fr 1fr; gap:28px; } }
@media(max-width:520px){ .foot-grid{ grid-template-columns:1fr; } }
.site-footer h4{ color:#fff; font-family:var(--ff-body); font-size:.86rem; letter-spacing:.1em;
  text-transform:uppercase; margin:0 0 14px; }
.site-footer ul{ list-style:none; padding:0; margin:0; }
.site-footer li{ margin:.5em 0; }
.site-footer a{ color:#BFD2C4; font-size:.95rem; }
.site-footer a:hover{ color:var(--gold); }
.foot-brand .brand{ color:#fff; margin-bottom:14px; }
.foot-brand .brand b{ color:#fff; }
.foot-brand p{ font-size:.92rem; color:#9DB6A5; max-width:300px; }
.foot-bottom{ border-top:1px solid rgba(255,255,255,.12); margin-top:40px; padding-top:22px;
  display:flex; flex-wrap:wrap; gap:10px 24px; justify-content:space-between; font-size:.84rem; color:#8FA897; }
.foot-bottom a{ color:#8FA897; }

/* ============================================================
   Misc
   ============================================================ */
.breadcrumb{ font-size:.85rem; color:var(--ink-soft); padding:16px 0 0; }
.breadcrumb a{ color:var(--ink-soft); }
.breadcrumb a:hover{ color:var(--green); }
.center{ text-align:center; }
.mt0{ margin-top:0; } .mb0{ margin-bottom:0; }
.muted{ color:var(--ink-soft); }
hr.rule{ border:none; border-top:1px solid var(--line); margin:40px 0; }

.sources{ background:var(--bg-alt); border-radius:var(--radius); padding:22px 26px; margin-top:36px; font-size:.9rem; }

.cluster-box{ background:var(--green-50); border:1px solid #CFE0D4; border-radius:var(--radius);
  padding:24px 26px; margin:36px 0 0; }
.cluster-box h2{ font-size:1.25rem; margin-bottom:.6em; }
.cluster-section{ margin:0 0 46px; }
.cluster-head{ display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between;
  gap:10px 20px; border-bottom:2px solid var(--line); padding-bottom:12px; margin-bottom:26px; }
.cluster-head h2{ margin:0; }
.cluster-hub-link{ font-weight:600; font-size:.95rem; color:var(--green); white-space:nowrap; }
.cluster-hub-link:hover{ color:var(--gold-700); }
.cluster-links{ list-style:none; padding:0; margin:0; }
.cluster-links li{ margin:.5em 0; padding-left:20px; position:relative; }
.cluster-links li::before{ content:"›"; position:absolute; left:0; color:var(--gold-700); font-weight:700; }
.cluster-links li.hub{ margin-top:.8em; padding-left:0; font-weight:600; }
.cluster-links li.hub::before{ content:""; }
.cluster-links a{ color:var(--green-700); text-decoration:none; }
.cluster-links a:hover{ color:var(--gold-700); text-decoration:underline; }
.sources h4{ font-family:var(--ff-display); font-size:1.05rem; margin-bottom:10px; }
.sources ol{ margin:0; padding-left:1.3em; color:var(--ink-soft); }
.sources li{ margin:.45em 0; }
.sources a{ word-break:break-word; }

/* FAQ accordion */
.faq-item{ background:var(--card); border:1px solid var(--line); border-radius:12px; margin-bottom:12px; overflow:hidden; }
.faq-item summary{ cursor:pointer; padding:18px 22px; font-weight:600; font-family:var(--ff-display);
  font-size:1.08rem; color:var(--green-900); list-style:none; display:flex; justify-content:space-between; gap:14px; align-items:center; }
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{ content:"+"; font-family:var(--ff-body); font-size:1.5rem; color:var(--gold-700); transition:.2s; }
.faq-item[open] summary::after{ transform:rotate(45deg); }
.faq-item .faq-body{ padding:0 22px 20px; color:var(--ink-soft); }
.faq-item .faq-body p:last-child{ margin-bottom:0; }

/* reveal on load */
.reveal{ opacity:0; transform:translateY(16px); animation:reveal .7s cubic-bezier(.2,.7,.2,1) forwards; }
@keyframes reveal{ to{ opacity:1; transform:none; } }
.d1{ animation-delay:.05s; } .d2{ animation-delay:.13s; } .d3{ animation-delay:.21s; } .d4{ animation-delay:.29s; }
@media(prefers-reduced-motion:reduce){ .reveal{ animation:none; opacity:1; transform:none; } html{ scroll-behavior:auto; } }

.skip{ position:absolute; left:-9999px; }
.skip:focus{ left:12px; top:12px; background:#fff; padding:10px 14px; border-radius:8px; z-index:100; box-shadow:var(--shadow); }