:root {
  --ink: #12333a;
  --ink-soft: #50666a;
  --deep: #0b292f;
  --teal: #0f4e56;
  --mint: #9ddbc9;
  --mint-pale: #e9f5f1;
  --cream: #f6f2e9;
  --paper: #fffdf8;
  --coral: #e26f55;
  --coral-dark: #b94e38;
  --line: #d8e2df;
  --white: #fff;
  --radius: 1.35rem;
  --shadow: 0 20px 55px rgba(11, 41, 47, .13);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Arial, Helvetica, sans-serif; line-height: 1.65; text-rendering: optimizeLegibility; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button, input { font: inherit; }
.wrap { width: min(1180px, calc(100% - 2rem)); margin-inline: auto; }
.narrow { width: min(900px, calc(100% - 2rem)); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: .75rem; left: .75rem; z-index: 1000; padding: .75rem 1rem; color: white; background: var(--deep); border-radius: .5rem; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid #ffb36f; outline-offset: 3px; }
.site-header { position: relative; z-index: 20; background: rgba(255,253,248,.97); border-bottom: 1px solid var(--line); }
.nav { min-height: 76px; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: .65rem; font-size: 1.04rem; text-decoration: none; white-space: nowrap; }
.brand strong { color: var(--coral-dark); }
.brand-mark { display: grid; width: 42px; height: 42px; place-items: center; color: var(--teal); background: var(--mint-pale); border-radius: 50%; }
.brand-mark svg { width: 27px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.nav nav { display: flex; align-items: center; justify-content: center; gap: clamp(.8rem,2vw,1.7rem); margin-left: auto; }
.nav nav a { color: var(--ink-soft); font-size: .91rem; font-weight: 700; text-decoration: none; }
.nav nav a:hover, .nav nav a[aria-current="page"] { color: var(--coral-dark); }
.header-cta { padding: .7rem 1rem; color: white; background: var(--teal); border-radius: 999px; font-size: .9rem; font-weight: 800; text-decoration: none; }
.header-cta:hover { background: var(--deep); }
.redirect-note { padding: .65rem 0; color: #5b3613; background: #fff0cc; text-align: center; }
.hero { position: relative; min-height: 660px; display: flex; align-items: center; overflow: hidden; background: var(--deep); }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,31,36,.96) 0%, rgba(7,31,36,.88) 39%, rgba(7,31,36,.24) 65%, rgba(7,31,36,.02) 100%); }
.hero-content { position: relative; z-index: 2; padding-block: 5rem; color: white; }
.eyebrow { margin: 0 0 .8rem; color: #bfeadd; font-size: .75rem; font-weight: 900; letter-spacing: .15em; line-height: 1.3; text-transform: uppercase; }
.eyebrow.dark { color: var(--coral-dark); }
.eyebrow.light { color: #a8dfd0; }
h1,h2,h3 { margin-top: 0; line-height: 1.12; letter-spacing: -.025em; }
h1 { max-width: 720px; margin-bottom: 1.2rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.9rem,5.4vw,5.35rem); font-weight: 500; }
h2 { margin-bottom: 1rem; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.05rem,3.4vw,3.35rem); font-weight: 500; }
h3 { font-size: 1.22rem; }
p { margin-top: 0; }
.hero-lead { max-width: 620px; margin-bottom: 1.8rem; color: #e4efec; font-size: clamp(1.05rem,1.5vw,1.22rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 49px; padding: .75rem 1.2rem; border: 2px solid transparent; border-radius: 999px; font-weight: 800; text-align: center; text-decoration: none; transition: transform .2s,background .2s; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: white; background: var(--coral); }
.button.primary:hover { background: var(--coral-dark); }
.button.secondary { color: white; border-color: rgba(255,255,255,.72); background: rgba(255,255,255,.06); }
.button.secondary:hover { background: rgba(255,255,255,.14); }
.ai-label { display: inline-block; margin-top: 1.5rem; padding: .32rem .65rem; color: #e7f3ef; background: rgba(0,0,0,.27); border-radius: .35rem; font-size: .76rem; }
.truth-strip { padding: 1.5rem 0; color: white; background: var(--teal); }
.truth-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 2rem; }
.truth-grid p { margin: 0; color: #d7ebe6; font-size: .88rem; }
.truth-grid strong { display: block; color: white; }
.search-band { padding: 2.4rem 0; background: var(--cream); border-bottom: 1px solid #e2dace; }
.search-layout { display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 3rem; }
.search-layout h2 { margin-bottom: .35rem; font-size: clamp(1.65rem,2.5vw,2.25rem); }
.search-layout p { margin-bottom: 0; color: var(--ink-soft); }
.search-layout form label { display: block; margin-bottom: .45rem; font-size: .88rem; font-weight: 800; }
.search-box { display: flex; padding: .4rem; background: white; border: 1px solid #c7d4d0; border-radius: 999px; box-shadow: 0 8px 24px rgba(11,41,47,.08); }
.search-box input[type="search"] { width: 100%; min-width: 0; padding: .6rem 1rem; color: var(--ink); background: transparent; border: 0; outline: 0; }
.search-box:focus-within { outline: 3px solid #ffb36f; outline-offset: 2px; }
.search-box button { flex: none; padding: .65rem 1.2rem; color: white; background: var(--teal); border: 0; border-radius: 999px; font-weight: 800; cursor: pointer; }
.section { padding: clamp(4.5rem,8vw,7.5rem) 0; scroll-margin-top: 1rem; }
.section-heading { display: grid; grid-template-columns: 1.25fr .75fr; align-items: end; gap: 4rem; margin-bottom: 3rem; }
.section-heading h2 { max-width: 780px; margin-bottom: 0; }
.section-heading > p { margin-bottom: .25rem; color: var(--ink-soft); }
.basics { background: var(--paper); }
.function-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.function-grid article { min-height: 315px; padding: 2rem; background: var(--mint-pale); border-radius: var(--radius); }
.function-grid article.caution { color: white; background: var(--deep); }
.function-grid article > span { display: block; margin-bottom: 4rem; color: var(--coral-dark); font-family: Georgia,serif; }
.function-grid .caution > span { color: var(--mint); }
.function-grid p { color: var(--ink-soft); }
.function-grid .caution p { color: #c7d9d5; }
.learn-more { display: flex; align-items: center; justify-content: space-between; gap: 2rem; margin-top: 1rem; padding: 1.2rem 1.5rem; border: 1px solid var(--line); border-radius: 1rem; }
.learn-more p { margin: 0; color: var(--ink-soft); }
.learn-more a,.text-link { flex: none; color: var(--coral-dark); font-weight: 800; text-underline-offset: .2em; }
.criteria { color: white; background: var(--deep); }
.criteria-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(3rem,7vw,7rem); }
.criteria-copy { position: sticky; top: 2rem; align-self: start; }
.criteria-copy > p { color: #cadbd7; }
.light-link { color: var(--mint); }
.criteria-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.18); }
.criteria-list li { display: grid; grid-template-columns: 54px 1fr; gap: 1rem; padding: 1.45rem 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.criteria-list span { color: var(--mint); font-family: Georgia,serif; }
.criteria-list h3 { margin-bottom: .35rem; }
.criteria-list p { margin: 0; color: #c3d5d1; }
.applications { background: var(--mint-pale); }
.application-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.application-grid article { padding: 1.65rem; background: var(--paper); border-radius: 1rem; box-shadow: 0 8px 24px rgba(11,41,47,.06); }
.application-grid article > span { display: grid; width: 44px; height: 44px; margin-bottom: 2.5rem; place-items: center; color: white; background: var(--coral); border-radius: 50%; font-size: 1.2rem; font-weight: 800; }
.application-grid p { margin-bottom: 0; color: var(--ink-soft); }
.placement { background: var(--paper); }
.placement-card { display: grid; grid-template-columns: .55fr 1.45fr; align-items: center; gap: 4rem; padding: clamp(2rem,5vw,4rem); color: white; background: var(--teal); border-radius: var(--radius); box-shadow: var(--shadow); }
.placement-number { font-family: Georgia,serif; font-size: clamp(5rem,14vw,11rem); line-height: .8; text-align: center; color: var(--mint); }
.placement-card h2 { max-width: 700px; }
.placement-card ul { padding-left: 1.2rem; color: #d3e5e0; }
.placement-card li { margin: .5rem 0; }
.products { background: var(--cream); }
.product-links { display: grid; grid-template-columns: repeat(2,1fr); gap: .8rem; }
.product-links a { display: grid; grid-template-columns: 1fr auto; padding: 1.3rem 1.4rem; color: var(--ink); background: white; border: 1px solid #ded8cc; border-radius: 1rem; text-decoration: none; transition: transform .2s,border-color .2s; }
.product-links a:hover { transform: translateY(-2px); border-color: var(--coral); }
.product-links span { font-family: Georgia,serif; font-size: 1.3rem; font-weight: 700; }
.product-links small { grid-column: 1; color: var(--ink-soft); }
.product-links b { grid-column: 2; grid-row: 1 / span 2; align-self: center; color: var(--coral-dark); font-size: 1.3rem; }
.faq { background: var(--paper); }
.faq-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(3rem,7vw,7rem); }
.accordion { border-top: 1px solid var(--line); }
.accordion details { border-bottom: 1px solid var(--line); }
.accordion summary { position: relative; padding: 1.4rem 2.5rem 1.4rem 0; font-size: 1.05rem; font-weight: 800; cursor: pointer; list-style: none; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; position: absolute; right: .4rem; top: 1.15rem; color: var(--coral-dark); font-size: 1.65rem; font-weight: 400; }
.accordion details[open] summary::after { content: "–"; }
.accordion details p { padding-right: 2rem; color: var(--ink-soft); }
.sources { padding: 3.5rem 0; background: var(--mint-pale); }
.sources-inner { display: grid; grid-template-columns: .65fr 1.35fr; gap: 4rem; }
.sources h2 { font-size: 2.2rem; }
.sources-inner > div:last-child { display: grid; gap: .6rem; }
.sources a { color: var(--teal); font-weight: 800; text-underline-offset: .2em; }
.sources-inner > div:last-child p { margin: 1rem 0 0; color: var(--ink-soft); font-size: .85rem; }
.final-cta { padding: 3.5rem 0; color: white; background: var(--coral-dark); }
.final-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.final-cta h2 { max-width: 730px; margin-bottom: 0; }
.final-cta .eyebrow { color: #ffd2c8; }
.final-cta .button.primary { flex: none; color: var(--coral-dark); background: white; }
.site-footer { padding: 4rem 0 1.5rem; color: #d6e6e2; background: #071e23; }
.footer-main { display: grid; grid-template-columns: 1.2fr .8fr; gap: 4rem; padding-bottom: 3rem; }
.footer-brand { margin-bottom: 1.3rem; color: white; }
.footer-main p { max-width: 690px; color: #a9c0ba; }
.footer-navs { display: grid; grid-template-columns: repeat(2,1fr); gap: 2rem; }
.footer-navs nav { display: flex; flex-direction: column; align-items: flex-start; gap: .55rem; }
.footer-navs nav strong { margin-bottom: .4rem; color: white; }
.footer-navs a { color: #c3d7d2; text-underline-offset: .2em; }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; padding-top: 1.3rem; color: #829e97; border-top: 1px solid rgba(255,255,255,.14); font-size: .84rem; }
.compact-footer { padding-top: 3rem; }
.compact-footer .footer-main { padding-bottom: 2rem; }

/* Ratgeberseiten */
.article-hero { padding: clamp(4rem,8vw,7rem) 0; color: white; background: radial-gradient(circle at 90% 10%, #17616a 0, var(--deep) 45%); }
.article-hero h1 { max-width: 850px; font-size: clamp(2.75rem,5vw,4.8rem); }
.article-hero > .wrap > p:last-child { max-width: 750px; margin-bottom: 0; color: #cfe0dc; font-size: 1.15rem; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 3rem; color: #a9c8c1; font-size: .85rem; }
.breadcrumb a { color: white; }
.article-content { padding: clamp(3.5rem,7vw,6.5rem) 0; }
.article-layout { display: grid; grid-template-columns: 220px minmax(0,760px); justify-content: space-between; gap: 5rem; }
.toc { position: sticky; top: 2rem; align-self: start; display: flex; flex-direction: column; gap: .65rem; padding: 1.2rem; background: var(--mint-pale); border-radius: 1rem; }
.toc strong { margin-bottom: .4rem; }
.toc a { color: var(--ink-soft); font-size: .9rem; text-underline-offset: .2em; }
.prose > section { padding-bottom: 3.5rem; margin-bottom: 3.5rem; border-bottom: 1px solid var(--line); scroll-margin-top: 2rem; }
.prose h2 { font-size: clamp(1.85rem,3vw,2.7rem); }
.prose p,.prose li { color: var(--ink-soft); }
.prose li { margin: .55rem 0; }
.info-box { margin: 1.6rem 0; padding: 1.3rem 1.5rem; background: var(--mint-pale); border-left: 4px solid var(--teal); border-radius: .4rem 1rem 1rem .4rem; }
.info-box p { margin: .35rem 0 0; }
.formula { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: .8rem; margin: 1.7rem 0; padding: 1.5rem; color: white; background: var(--teal); border-radius: 1rem; }
.formula span,.formula strong { padding: .5rem .8rem; background: rgba(255,255,255,.1); border-radius: .45rem; }
.formula strong { background: var(--coral); }
.volume-calculator { margin: 1.8rem 0 2rem; }
.volume-calculator fieldset {
  margin: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--cream);
  border: 1px solid #dfd8cc;
  border-radius: 1rem;
}
.volume-calculator legend {
  padding: 0 .45rem;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
}
.calculator-intro { margin-bottom: 1.25rem; }
.volume-calculator .calculator-mode {
  margin: 0 0 1.4rem;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}
.volume-calculator .calculator-mode legend {
  margin-bottom: .55rem;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: .9rem;
  font-weight: 800;
}
.mode-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .45rem;
  padding: .35rem;
  background: #e6e0d5;
  border-radius: .8rem;
}
.mode-options label { cursor: pointer; }
.mode-options input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.mode-options span {
  display: block;
  padding: .65rem .75rem;
  color: var(--ink-soft);
  background: transparent;
  border: 2px solid transparent;
  border-radius: .6rem;
  font-weight: 800;
  text-align: center;
}
.mode-options input:checked + span {
  color: white;
  background: var(--teal);
}
.mode-options input:focus-visible + span {
  outline: 3px solid #ffb36f;
  outline-offset: 2px;
}
.calculator-fields {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
}
.single-calculator-field { grid-template-columns: 1fr; }
.calculator-common-height {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}
.calculator-field label {
  display: block;
  margin-bottom: .4rem;
  color: var(--ink);
  font-weight: 800;
}
.calculator-field small {
  display: block;
  margin-top: .35rem;
  color: var(--ink-soft);
}
.input-with-unit {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  overflow: hidden;
  background: white;
  border: 1px solid #bccbc7;
  border-radius: .65rem;
}
.input-with-unit:focus-within {
  outline: 3px solid #ffb36f;
  outline-offset: 2px;
}
.input-with-unit input {
  width: 100%;
  min-width: 0;
  padding: .75rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
}
.input-with-unit span {
  padding: .75rem;
  color: var(--ink-soft);
  background: var(--mint-pale);
  font-weight: 800;
}
.calculator-operator {
  margin-top: .25rem;
  color: var(--coral-dark);
  font-size: 1.5rem;
  font-weight: 800;
}
.calculator-button { margin-top: 1.4rem; border: 0; cursor: pointer; }
.calculator-result {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: .25rem 1rem;
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  color: white;
  background: var(--teal);
  border-radius: .75rem;
}
.calculator-result > span {
  color: #bee0d8;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.calculator-result output {
  justify-self: end;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.65rem;
  font-weight: 700;
}
.calculator-result p {
  grid-column: 1 / -1;
  margin: .3rem 0 0;
  color: #d6e7e3;
  font-size: .9rem;
}
[hidden] { display: none !important; }
.check-list { padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 2rem; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--coral-dark); font-weight: 900; }
.article-cta { display: flex; align-items: center; justify-content: space-between; gap: 2rem; margin-bottom: 3.5rem; padding: 1.7rem; color: white; background: var(--teal); border-radius: 1rem; }
.article-cta p { margin: .3rem 0 0; color: #cae0db; }
.article-cta .button { flex: none; }
.article-sources { border-bottom: 0 !important; }
.article-sources a { color: var(--teal); text-underline-offset: .2em; }

@media (max-width: 980px) {
  .nav { flex-wrap: wrap; padding-block: .8rem; }
  .nav nav { order: 3; width: 100%; justify-content: flex-start; overflow-x: auto; padding-top: .5rem; border-top: 1px solid var(--line); }
  .header-cta { margin-left: auto; }
  .truth-grid,.function-grid { grid-template-columns: 1fr; }
  .function-grid article { min-height: 240px; }
  .function-grid article > span { margin-bottom: 2.5rem; }
  .application-grid { grid-template-columns: repeat(2,1fr); }
  .article-layout { grid-template-columns: 190px minmax(0,1fr); gap: 3rem; }
}
@media (max-width: 760px) {
  .wrap,.narrow { width: min(100% - 1.25rem,1180px); }
  .brand { font-size: .9rem; }
  .brand-mark { width: 36px; height: 36px; }
  .header-cta { padding: .6rem .8rem; font-size: .8rem; }
  .nav nav { gap: 1.2rem; }
  .hero { min-height: 750px; align-items: end; padding-top: 260px; }
  .hero-image { height: 350px; object-position: 62% center; }
  .hero-overlay { background: linear-gradient(180deg,rgba(7,31,36,0) 0,rgba(7,31,36,.15) 38%,var(--deep) 47%,var(--deep) 100%); }
  .hero-content { padding: 5rem .1rem 3.5rem; }
  h1 { font-size: clamp(2.55rem,12vw,4rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .truth-grid { gap: 1rem; }
  .truth-grid p { padding-bottom: 1rem; border-bottom: 1px solid rgba(255,255,255,.15); }
  .truth-grid p:last-child { padding-bottom: 0; border: 0; }
  .search-layout,.section-heading,.criteria-layout,.placement-card,.faq-layout,.sources-inner,.footer-main,.article-layout { grid-template-columns: 1fr; }
  .search-layout,.section-heading,.criteria-layout,.faq-layout,.sources-inner { gap: 2rem; }
  .search-box { border-radius: .9rem; }
  .criteria-copy,.toc { position: static; }
  .application-grid,.product-links { grid-template-columns: 1fr; }
  .placement-card { gap: 2rem; }
  .placement-number { text-align: left; }
  .final-cta-inner,.learn-more,.article-cta { align-items: stretch; flex-direction: column; }
  .footer-main { gap: 2rem; }
  .footer-bottom { flex-direction: column; }
  .article-layout { gap: 2.5rem; }
  .toc { display: grid; grid-template-columns: repeat(2,1fr); }
  .toc strong { grid-column: 1 / -1; }
}
@media (max-width: 430px) {
  .header-cta { display: none; }
  .nav nav a { font-size: .84rem; }
  .search-box { display: grid; }
  .search-box button { width: 100%; }
  .footer-navs { grid-template-columns: 1fr; }
  .formula { align-items: stretch; flex-direction: column; text-align: center; }
  .calculator-fields { grid-template-columns: 1fr; }
  .calculator-common-height { grid-template-columns: 1fr; }
  .calculator-operator { display: none; }
  .mode-options { grid-template-columns: 1fr; }
  .calculator-button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { transition: none !important; }
}
@media (forced-colors: active) {
  .button,.header-cta,.search-box button { border: 2px solid ButtonText; }
}