/* Wärmepreisrechner — Design-System v2 */
:root {
  --ground: #F4F6F3;
  --surface: #FFFFFF;
  --surface2: #EDF1EC;
  --ink: #1E2A24;
  --muted: #5C6B62;
  --faint: #8B988F;
  --border: #E0E6DF;
  --border-strong: #C6CFC6;
  --accent: #1C7C54;
  --accent-ink: #14593D;
  --accent-soft: #E4F1EA;
  --energy: #C77D1F;
  --energy-soft: #F8EEDD;
  --pos: #1C7C54;
  --neg: #B4463A;
  --chart-a: #00897B;
  --chart-b: #C0392B;
  --chart-c: #B98317;
  --shadow: 0 8px 30px rgba(30, 42, 36, 0.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --ground: #141917; --surface: #1D2420; --surface2: #232B26;
    --ink: #E5EAE6; --muted: #9EABA1; --faint: #75837A;
    --border: #2C352F; --border-strong: #3D4841;
    --accent: #4FBE8C; --accent-ink: #7DD3AB; --accent-soft: #1E3229;
    --energy: #E0A63E; --energy-soft: #2C2517;
    --pos: #4FBE8C; --neg: #E08A7B;
    --chart-a: #1F9E92; --chart-b: #CC5A72; --chart-c: #B58915;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font-family: "Figtree", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px; line-height: 1.65; -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; margin: 0 auto; }

h1, h2, h3, h4 { font-family: "Sora", "Figtree", sans-serif; text-wrap: balance; line-height: 1.18; }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: clamp(1.35rem, 3vw, 1.7rem); margin: 2.2em 0 0.5em; }
h3 { font-size: 1.12rem; margin: 1.6em 0 0.4em; }
p { margin: 0 0 1em; }
article p, article ul, article ol { max-width: 70ch; }
a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
img, svg { max-width: 100%; height: auto; }

/* ---------- Navigation ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--ground) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 20px; padding: 12px 20px; max-width: 1080px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 9px; font-family: "Sora", sans-serif; font-weight: 700; font-size: 1rem; color: var(--ink); text-decoration: none; }
.brand .logo { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: #fff; display: grid; place-items: center; font-size: 1rem; }
.nav-links { margin-left: auto; display: flex; gap: 18px; font-size: 0.92rem; font-weight: 600; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current] { color: var(--accent); }
.nav-cta { background: var(--accent); color: #fff !important; border-radius: 8px; padding: 7px 14px; }
@media (max-width: 640px) { .nav-links { gap: 12px; font-size: 0.85rem; } .nav-links .hidemobile { display: none; } }

/* ---------- Hero ---------- */
.hero { padding: 56px 0 30px; }
.eyebrow { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
.sub { color: var(--muted); font-size: 1.12rem; max-width: 58ch; }

/* ---------- Panels & Cards ---------- */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; box-shadow: var(--shadow); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; display: flex; flex-direction: column; gap: 8px; transition: transform .18s, box-shadow .18s; }
a.card { color: var(--ink); text-decoration: none; }
a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.card .k { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; color: var(--accent); }
.card h3 { margin: 0; font-size: 1.05rem; }
.card p { font-size: 0.9rem; color: var(--muted); margin: 0; }
.card .more { margin-top: auto; font-size: 0.85rem; font-weight: 700; color: var(--accent); }

/* ---------- Stat callouts ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 24px 0; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.stat .v { font-family: "Sora", sans-serif; font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--accent-ink); }
.stat .l { font-size: 0.8rem; color: var(--muted); line-height: 1.4; }
.stat .src { font-size: 0.68rem; color: var(--faint); }

/* ---------- Tables ---------- */
.tablewrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); margin: 20px 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
caption { text-align: left; font-size: 0.8rem; color: var(--muted); padding: 10px 14px 0; caption-side: top; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); background: var(--surface2); border-bottom: 1px solid var(--border-strong); }
tbody tr:last-child td { border-bottom: none; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.pos { color: var(--pos); font-weight: 600; } .neg { color: var(--neg); font-weight: 600; }

/* ---------- Figures ---------- */
figure { margin: 26px 0; }
figure .figbox { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 8px; }
figcaption .src { color: var(--faint); }
.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.78rem; color: var(--muted); margin-top: 10px; }
.legend i { width: 14px; height: 3px; display: inline-block; border-radius: 2px; margin-right: 5px; vertical-align: middle; }

/* ---------- Callout boxes ---------- */
.box { background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 22px 0; }
.box.warn { background: var(--energy-soft); border-left-color: var(--energy); }
.box .bh { font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--accent-ink); display: block; margin-bottom: 6px; }
.box.warn .bh { color: var(--energy); }
.box p:last-child { margin-bottom: 0; }

/* ---------- Scrollytelling ---------- */
.scrolly { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin: 30px 0; align-items: start; }
.scrolly .sticky { position: sticky; top: 74px; }
.scrolly .steps > div { min-height: 46vh; display: flex; align-items: center; }
.scrolly .step-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; box-shadow: var(--shadow); }
@media (max-width: 820px) { .scrolly { grid-template-columns: 1fr; } .scrolly .sticky { position: static; } .scrolly .steps > div { min-height: 0; margin-bottom: 16px; } }

/* ---------- Reveal on scroll ---------- */
.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) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, a.card:hover { transition: none; transform: none; }
}

/* ---------- Article ---------- */
.art-head { padding: 48px 0 8px; }
.crumbs { font-size: 0.8rem; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.art-meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.82rem; color: var(--muted); margin: 10px 0 0; }
.art-meta b { color: var(--ink); }
article { padding-bottom: 30px; }
article ul li, article ol li { margin-bottom: 6px; }
.toc { background: var(--surface2); border-radius: 12px; padding: 14px 20px; font-size: 0.9rem; margin: 24px 0; }
.toc b { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--muted); }
.toc ol { margin: 8px 0 0; padding-left: 20px; }
details.faq { border: 1px solid var(--border); border-radius: 10px; background: var(--surface); margin-bottom: 10px; padding: 0 16px; }
details.faq summary { cursor: pointer; font-weight: 600; padding: 13px 0; list-style: none; }
details.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; }
details.faq[open] summary::after { content: "–"; }
details.faq p { color: var(--muted); font-size: 0.94rem; }
.sources { font-size: 0.8rem; color: var(--muted); border-top: 1px solid var(--border); padding-top: 14px; margin-top: 34px; }
.sources ol { padding-left: 18px; } .sources li { margin-bottom: 4px; overflow-wrap: anywhere; }
.prevnext { display: flex; justify-content: space-between; gap: 14px; margin: 30px 0; flex-wrap: wrap; }
.prevnext a { font-size: 0.9rem; font-weight: 600; }

/* ---------- CTA banner ---------- */
.cta-banner { background: linear-gradient(120deg, var(--accent-ink), var(--accent)); color: #fff; border-radius: 16px; padding: 28px; margin: 36px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.cta-banner h2, .cta-banner h3 { color: #fff; margin: 0 0 4px; }
.cta-banner p { color: rgba(255,255,255,0.85); margin: 0; font-size: 0.95rem; }
.cta-banner a.btn { background: #fff; color: var(--accent-ink); border-radius: 10px; padding: 12px 20px; font-weight: 700; text-decoration: none; white-space: nowrap; }

/* ---------- Footer ---------- */
footer.site { border-top: 1px solid var(--border-strong); margin-top: 56px; padding: 28px 0 44px; font-size: 0.85rem; color: var(--muted); }
footer.site .cols { display: flex; gap: 40px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--muted); }
footer.site .fine { margin-top: 18px; font-size: 0.75rem; color: var(--faint); max-width: 80ch; }

/* ---------- Rechner-spezifisch (übernommen aus v1) ---------- */
.tool { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 18px; align-items: start; }
@media (max-width: 860px) { .tool { grid-template-columns: 1fr; } }
.step { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; color: var(--accent); text-transform: uppercase; }
label.field { display: block; font-weight: 600; font-size: 0.88rem; margin: 16px 0 6px; }
label.field .val { float: right; font-weight: 700; color: var(--accent-ink); font-variant-numeric: tabular-nums; }
select, input[type=range] { width: 100%; }
select { padding: 9px 10px; border-radius: 9px; border: 1px solid var(--border-strong); background: var(--surface); color: var(--ink); font: inherit; font-size: 0.92rem; }
input[type=range] { accent-color: var(--accent); height: 28px; }
.scale { display: flex; gap: 3px; margin: 14px 0 4px; }
.scale div { flex: 1; text-align: center; font-weight: 700; font-size: 0.78rem; color: #fff; padding: 7px 0; border-radius: 6px; position: relative; transition: transform .25s; }
.scale div.now { transform: translateY(-4px); box-shadow: 0 3px 10px rgba(0,0,0,0.25); }
.scale div.now::after { content: attr(data-tag); position: absolute; top: -20px; left: 50%; transform: translateX(-50%); font-size: 0.62rem; letter-spacing: 0.06em; color: var(--ink); font-weight: 700; white-space: nowrap; }
.scale-note { font-size: 0.8rem; color: var(--muted); margin-bottom: 4px; }
.measures { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
@media (max-width: 560px) { .measures { grid-template-columns: 1fr; } }
.m { border: 1.5px solid var(--border); border-radius: 11px; padding: 11px 13px; cursor: pointer; display: flex; gap: 10px; align-items: flex-start; background: var(--surface); transition: border-color .15s, background .15s; }
.m:hover { border-color: var(--accent); }
.m.on { border-color: var(--accent); background: var(--accent-soft); }
.m input { margin-top: 3px; accent-color: var(--accent); }
.m .t { font-weight: 700; font-size: 0.92rem; }
.m .d { font-size: 0.78rem; color: var(--muted); line-height: 1.4; }
.m .c { font-size: 0.78rem; font-weight: 600; color: var(--energy); font-variant-numeric: tabular-nums; }
.results { position: sticky; top: 74px; }
.kpis { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0; }
.kpi { background: var(--ground); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
.kpi .l { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); font-weight: 600; }
.kpi .v { font-family: "Sora", sans-serif; font-size: 1.3rem; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1.3; }
.kpi .v.green { color: var(--pos); } .kpi .v.amber { color: var(--energy); }
.kpi .s { font-size: 0.74rem; color: var(--muted); }
.bigclass { display: flex; align-items: center; justify-content: center; gap: 18px; padding: 8px 0 2px; }
.bigclass .badge { width: 62px; height: 62px; border-radius: 14px; display: grid; place-items: center; font-family: "Sora", sans-serif; font-weight: 700; font-size: 1.7rem; color: #fff; }
.bigclass .arrow { font-size: 1.4rem; color: var(--faint); }
.bigclass .cap { text-align: center; font-size: 0.72rem; color: var(--muted); margin-top: 4px; font-weight: 600; }
.chartbox { margin-top: 14px; }
.chartbox h3 { font-size: 0.9rem; font-family: "Figtree", sans-serif; margin: 0 0 2px; }
.chartbox .cs { font-size: 0.76rem; color: var(--muted); margin: 0 0 8px; }
.scenario { background: var(--energy-soft); border: 1px solid var(--energy); border-radius: 11px; padding: 12px 14px; margin-top: 14px; }
.scenario label.field { margin-top: 4px; }
.scenario .val { color: var(--energy); }
.scenario input[type=range] { accent-color: var(--energy); }
.scenario .hint { font-size: 0.78rem; color: var(--muted); margin: 6px 0 0; }
.presets { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.presets button { border: 1px solid var(--accent); background: var(--surface); color: var(--ink); border-radius: 999px; padding: 4px 12px; font: inherit; font-size: 0.78rem; font-weight: 600; cursor: pointer; }
.presets button[aria-pressed="true"] { background: var(--accent); color: #fff; }
.scenario .presets button { border-color: var(--energy); }
.scenario .presets button[aria-pressed="true"] { background: var(--energy); color: #fff; }