@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --bg: #ffffff;
  --bg-alt: #f4f6f9;
  --surface: #ffffff;
  --border: #dde3ea;
  --border-light: #ecf0f4;
  --text: #16212f;
  --text-secondary: #5c6b7a;
  --brand: #f5a623;
  --brand-dark: #d08b0f;
  --brand-tint: #fff3de;
  --primary: #0f2744;
  --primary-hover: #0a1b30;
  --save: #1f9d55;
  --save-tint: #e7f7ee;
  --on-ink: #ffffff;
  --radius-card: 14px;
  --radius-btn: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 8px rgba(15, 39, 68, 0.08);
  --shadow-card-hover: 0 8px 24px rgba(15, 39, 68, 0.14);
  --max-width: 1240px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; }
p { margin: 0 0 1em; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--border-light);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.logo .bolt { color: var(--brand); }
nav.main-nav { display: flex; gap: 26px; align-items: center; }
nav.main-nav a {
  font-weight: 600;
  font-size: 14.5px;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
}
nav.main-nav a:hover, nav.main-nav a.active { color: var(--text); border-color: var(--brand); }
.header-cta {
  background: var(--brand);
  color: var(--primary) !important;
  font-weight: 700;
  font-size: 14px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.header-cta:hover { background: var(--brand-dark); }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; color: var(--text); }
@media (max-width: 860px) {
  nav.main-nav { display: none; }
  .nav-toggle { display: block; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 13px 24px;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  transition: transform .1s, box-shadow .15s, background .15s;
}
.btn-primary { background: var(--brand); color: var(--primary); }
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-1px); }
.btn-secondary { background: var(--primary); color: #fff; }
.btn-secondary:hover { background: var(--primary-hover); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--border); }
.btn-outline:hover { border-color: var(--primary); }
.btn-sm { padding: 9px 16px; font-size: 13.5px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--bg-alt), var(--bg)); }
.hero-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero-eyebrow { color: var(--brand-dark); font-weight: 700; font-size: 14px; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 10px; }
.hero h1 { font-size: 42px; letter-spacing: -0.02em; margin-bottom: 14px; }
.hero p.lead { font-size: 17px; color: var(--text-secondary); max-width: 520px; }
.hero-stats { display: flex; gap: 28px; margin-top: 24px; }
.hero-stat strong { display: block; font-size: 22px; color: var(--primary); }
.hero-stat span { font-size: 13px; color: var(--text-secondary); }
.hero-media img { border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}

/* ---------- Kaufberater (quiz) ---------- */
.kb-section { background: var(--primary); color: #fff; padding: 48px 0; }
.kb-head h2 { color: #fff; font-size: 28px; }
.kb-head p { color: #c3cedb; }
.kb-form {
  background: var(--surface);
  border-radius: var(--radius-card);
  padding: 28px;
  margin-top: 24px;
  display: grid;
  gap: 22px;
}
.kb-field label { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--primary); font-size: 14px; margin-bottom: 10px; text-transform: uppercase; letter-spacing: .03em; }
.kb-field select {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--border);
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
}
.kb-chip-group { display: flex; flex-wrap: wrap; gap: 10px; }
.kb-chip { position: relative; }
.kb-chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.kb-chip span {
  display: inline-flex;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--border);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all .12s;
}
.kb-chip input:checked + span { border-color: var(--brand); background: var(--brand-tint); color: var(--brand-dark); }
.kb-results { margin-top: 28px; }
.kb-results-grid { display: flex; flex-direction: column; gap: 14px; margin-top: 16px; transition: opacity .18s ease; }
.kb-results-grid.is-updating { opacity: 0; }
.kb-result-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-card);
  padding: 14px;
  box-shadow: var(--shadow-card);
}
.kb-result-media {
  position: relative;
  flex: none;
  width: 84px;
  height: 84px;
  border-radius: calc(var(--radius-card) - 4px);
  overflow: hidden;
  background: #fff;
}
.kb-result-media img { position: absolute; inset: 8px; width: calc(100% - 16px); height: calc(100% - 16px); object-fit: contain; }
.kb-result-body { flex: 1; min-width: 0; }
.kb-result-rank { font-size: 12px; font-weight: 800; color: var(--brand-dark); text-transform: uppercase; }
.kb-result-card h4 { font-size: 16px; margin: 4px 0; }
.kb-result-card p { font-size: 13.5px; color: var(--text-secondary); margin-bottom: 10px; }
.kb-result-card .btn { display: inline-flex; width: auto; }
@media (max-width: 560px) {
  .kb-result-card { flex-direction: column; align-items: stretch; text-align: center; }
  .kb-result-media { width: 100%; height: 160px; align-self: center; max-width: 220px; }
  .kb-result-card .btn { width: 100%; }
}

/* ---------- Cards / grids ---------- */
.section { padding: 48px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 32px; }
.section-head h2 { font-size: 28px; }
.section-head p { color: var(--text-secondary); }
.grid { display: grid; gap: 20px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 960px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-4, .grid-3 { grid-template-columns: 1fr; } }

.cat-tile {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 22px;
  transition: box-shadow .15s, transform .15s;
}
.cat-tile:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.cat-tile h3 { font-size: 17px; margin-bottom: 6px; }
.cat-tile p { font-size: 13.5px; color: var(--text-secondary); margin: 0; }

.product-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: box-shadow .15s, transform .15s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.product-media { position: relative; display: block; aspect-ratio: 1/1; overflow: hidden; background: #fff; }
.product-media img { position: absolute; inset: 14px; width: calc(100% - 28px); height: calc(100% - 28px); object-fit: contain; }
.product-body { padding: 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.product-tag { font-size: 11.5px; font-weight: 800; color: var(--brand-dark); text-transform: uppercase; letter-spacing: .03em; }
.product-body h3 { font-size: 16.5px; margin: 0; }
.product-body p { font-size: 13.5px; color: var(--text-secondary); margin: 0; flex: 1; }

/* ---------- Article / product page ---------- */
.article-head { padding: 40px 0 24px; background: var(--bg-alt); }
.breadcrumb { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; }
.breadcrumb a:hover { text-decoration: underline; }
.article-head h1 { font-size: 32px; max-width: 760px; }
.article-lead { font-size: 16.5px; color: var(--text-secondary); max-width: 700px; }

.article-body { max-width: 760px; margin: 0 auto; padding: 32px 0; }
.article-body h2 { font-size: 23px; margin-top: 36px; }
.article-body h3 { font-size: 18px; margin-top: 24px; }
.article-body img { border-radius: var(--radius-card); margin: 20px 0; }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.article-body th, .article-body td { padding: 10px 14px; border-bottom: 1px solid var(--border-light); text-align: left; }
.article-body th { color: var(--text-secondary); font-weight: 700; width: 42%; }

.cta-inline {
  background: var(--brand-tint);
  border: 1px solid var(--brand);
  border-radius: var(--radius-card);
  padding: 18px 20px;
  margin: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.cta-inline p { margin: 0; font-weight: 600; color: var(--primary); }
.cta-sticky {
  position: sticky;
  bottom: 16px;
  display: flex;
  justify-content: center;
  z-index: 40;
  pointer-events: none;
}
.cta-sticky .btn { pointer-events: auto; box-shadow: 0 10px 30px rgba(15,39,68,.25); }
.affiliate-note { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

.editorial-box {
  background: var(--save-tint);
  border-left: 4px solid var(--save);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 14.5px;
}
.editorial-box strong { color: var(--save); display: block; margin-bottom: 4px; font-size: 13px; text-transform: uppercase; letter-spacing: .03em; }

.toc { background: var(--bg-alt); border-radius: var(--radius-card); padding: 18px 22px; margin: 24px 0; }
.toc .toc-label { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .03em; color: var(--text-secondary); }
.toc ol { margin: 10px 0 0; padding-left: 20px; }
.toc li { font-size: 14px; margin-bottom: 6px; }
.toc a:hover { text-decoration: underline; }

.faq-item { border-bottom: 1px solid var(--border-light); padding: 14px 0; }
.faq-item summary { font-weight: 700; cursor: pointer; font-size: 15px; }
.faq-item p { margin-top: 10px; color: var(--text-secondary); }

.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 16px; }
@media (max-width: 860px) { .related-grid { grid-template-columns: 1fr; } }

/* ---------- Stromkosten-Rechner ---------- */
.calc-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 28px;
  display: grid;
  gap: 20px;
}
.calc-field label { display: block; font-weight: 700; font-size: 14px; color: var(--primary); margin-bottom: 8px; }
.calc-field select, .calc-field input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--border);
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
}
.calc-field .calc-hint { font-size: 12.5px; color: var(--text-secondary); margin-top: 6px; }
.calc-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 600px) { .calc-row { grid-template-columns: 1fr; } }
.calc-results {
  margin-top: 8px;
  background: var(--bg-alt);
  border-radius: var(--radius-card);
  padding: 22px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  text-align: center;
}
@media (max-width: 700px) { .calc-results { grid-template-columns: 1fr; } }
.calc-result-item .calc-result-label { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--text-secondary); font-weight: 700; }
.calc-result-item .calc-result-value { font-size: 26px; font-weight: 800; color: var(--primary); margin-top: 4px; }
.calc-result-item .calc-result-sub { font-size: 12.5px; color: var(--text-secondary); margin-top: 2px; }
.calc-cta { text-align: center; margin-top: 10px; }

/* ---------- Shop ---------- */
.shop-layout { display: grid; grid-template-columns: 260px 1fr; gap: 32px; align-items: start; }
.shop-sidebar {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 20px;
  position: sticky;
  top: 92px;
}
.filter-group { margin-bottom: 22px; }
.filter-group:last-child { margin-bottom: 0; }
.filter-group h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .03em; color: var(--text-secondary); margin-bottom: 10px; }
.filter-check { display: flex; align-items: center; gap: 8px; padding: 6px 0; font-size: 14px; cursor: pointer; }
.filter-check small { color: var(--text-secondary); }
.filter-check input { accent-color: var(--brand); width: 16px; height: 16px; }
.shop-reset { font-size: 13px; color: var(--brand-dark); font-weight: 700; margin-top: 14px; display: inline-block; cursor: pointer; background: none; border: none; padding: 0; }
.shop-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.shop-toolbar select { padding: 10px 14px; border-radius: var(--radius-btn); border: 1px solid var(--border); font-size: 14px; }
#shop-count { font-size: 14px; color: var(--text-secondary); }
.shop-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.shop-empty { grid-column: 1 / -1; text-align: center; padding: 48px 16px; color: var(--text-secondary); }
.shop-empty p { margin-bottom: 16px; }
.shop-badge {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  background: var(--brand); color: var(--primary); font-size: 11px; font-weight: 800;
  padding: 4px 10px; border-radius: var(--radius-pill); text-transform: uppercase;
}
.shop-grid .product-card { position: relative; }
.shop-price { font-size: 15px; font-weight: 700; margin: 2px 0 6px; }
.price-old { text-decoration: line-through; color: var(--text-secondary); font-weight: 500; font-size: 13px; }
.price-new { color: var(--primary); }
@media (max-width: 960px) {
  .shop-layout { grid-template-columns: 1fr; }
  .shop-sidebar { position: static; }
  .shop-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) { .shop-grid { grid-template-columns: 1fr; } }

/* ---------- Footer ---------- */
.site-footer { background: var(--primary); color: #c3cedb; padding: 48px 0 24px; margin-top: 48px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid h4 { color: #fff; font-size: 14px; margin-bottom: 14px; }
.footer-grid a { display: block; font-size: 14px; color: #a9b7c6; margin-bottom: 8px; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 32px; padding-top: 20px; font-size: 12.5px; color: #8696a8; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- Affiliate disclosure banner ---------- */
.affiliate-banner { background: var(--bg-alt); border-bottom: 1px solid var(--border-light); font-size: 12.5px; color: var(--text-secondary); text-align: center; padding: 8px 0; }
.affiliate-banner a { text-decoration: underline; }