/* ============================================
   kaloriendefizit-berechnen.de — main stylesheet
   Aesthetic: editorial, trustworthy German health
   Type pairing: Fraunces (display serif) + Inter Tight (body)
   ============================================ */

:root {
  /* Color palette — calm, credible, German health-portal */
  --c-ink:        #1a2421;       /* near-black with green undertone */
  --c-body:       #3d4944;       /* body text */
  --c-mute:       #6b7670;       /* secondary text */
  --c-line:       #e3e7e3;       /* hairline borders */
  --c-cream:      #f7f4ee;       /* warm off-white background */
  --c-paper:      #ffffff;
  --c-fern:       #1f5d4c;       /* primary brand: deep fern green */
  --c-fern-dark:  #143d31;
  --c-fern-soft:  #e8f0ec;
  --c-amber:      #c47b1c;       /* accent for highlights / results */
  --c-amber-soft: #fbf0dd;
  --c-red:        #c0392b;
  --c-blue:       #2d5b7d;

  /* Typography */
  --f-display: 'Fraunces', 'Georgia', serif;
  --f-body:    'Inter Tight', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px;  --sp-9: 96px;

  /* Layout */
  --container: 1140px;
  --container-narrow: 760px;
  --radius: 10px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(20,30,25,.05);
  --shadow:    0 4px 14px rgba(20,30,25,.07);
  --shadow-lg: 0 10px 40px rgba(20,30,25,.10);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--c-body);
  background: var(--c-cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
a { color: var(--c-fern); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--c-fern-dark); text-decoration-thickness: 2px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--f-display);
  color: var(--c-ink);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 var(--sp-4);
}
h1 { font-size: clamp(2rem, 4.5vw + 0.5rem, 3.4rem); font-weight: 700; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.6rem, 2.6vw + 0.5rem, 2.2rem); margin-top: var(--sp-7); }
h3 { font-size: clamp(1.25rem, 1.4vw + 0.5rem, 1.45rem); margin-top: var(--sp-6); }
h4 { font-size: 1.1rem; }

p { margin: 0 0 var(--sp-4); }
ul, ol { margin: 0 0 var(--sp-4); padding-left: 1.4em; }
li { margin-bottom: var(--sp-2); }
strong { color: var(--c-ink); font-weight: 600; }

/* ---------- Layout ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--sp-4); }
.container--narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--sp-4); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--c-ink); color: #fff; padding: 8px 16px; z-index: 9999;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ---------- Header ---------- */
.site-header {
  background: var(--c-paper);
  border-bottom: 1px solid var(--c-line);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,0.92);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-3) var(--sp-4);
  gap: var(--sp-4);
}
.logo {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  text-decoration: none; color: var(--c-ink);
  font-family: var(--f-display); font-weight: 600; font-size: 1.1rem;
}
.logo svg { color: var(--c-fern); }
.logo__tld { color: var(--c-mute); font-weight: 400; }

.primary-nav ul {
  display: flex; gap: var(--sp-5); list-style: none; margin: 0; padding: 0;
}
.primary-nav a {
  font-size: 0.94rem; color: var(--c-body); text-decoration: none;
  padding: var(--sp-2) 0; border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.primary-nav a:hover, .primary-nav a:focus {
  color: var(--c-fern); border-bottom-color: var(--c-fern);
}

.nav-toggle { display: none; padding: 8px; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--c-ink); margin: 5px 0;
  transition: transform .2s, opacity .2s;
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .primary-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--c-paper); border-bottom: 1px solid var(--c-line);
    max-height: 0; overflow: hidden; transition: max-height .25s ease;
  }
  .primary-nav.is-open { max-height: 600px; }
  .primary-nav ul { flex-direction: column; gap: 0; padding: var(--sp-3); }
  .primary-nav a { display: block; padding: var(--sp-3); border-bottom: 1px solid var(--c-line); }
  .primary-nav li:last-child a { border-bottom: 0; }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--sp-8) 0 var(--sp-7);
  background: linear-gradient(180deg, var(--c-fern-soft) 0%, var(--c-cream) 100%);
  position: relative; overflow: hidden;
}
.hero__inner {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: var(--sp-7); align-items: center;
}
.hero__eyebrow {
  display: inline-block; font-size: 0.78rem; letter-spacing: 0.12em;
  text-transform: uppercase; font-weight: 600; color: var(--c-fern);
  background: rgba(31,93,76,.1); padding: 6px 12px; border-radius: 100px;
  margin-bottom: var(--sp-4);
}
.hero h1 { margin-bottom: var(--sp-4); }
.hero h1 em {
  font-style: italic; color: var(--c-fern);
  font-feature-settings: 'ss01';
}
.hero__lead { font-size: 1.15rem; color: var(--c-body); margin-bottom: var(--sp-5); }
.hero__cta { display: flex; gap: var(--sp-3); flex-wrap: wrap; }

@media (max-width: 800px) {
  .hero { padding: var(--sp-6) 0; }
  .hero__inner { grid-template-columns: 1fr; gap: var(--sp-5); }
  .hero__visual { order: -1; max-width: 320px; margin: 0 auto; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 24px; border-radius: var(--radius);
  font-weight: 600; font-size: 0.98rem;
  text-decoration: none; border: 2px solid transparent;
  transition: transform .12s, box-shadow .15s, background .15s;
  cursor: pointer;
}
.btn--primary { background: var(--c-fern); color: #fff; }
.btn--primary:hover { background: var(--c-fern-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn--ghost { background: transparent; color: var(--c-ink); border-color: var(--c-line); }
.btn--ghost:hover { border-color: var(--c-ink); }
.btn--block { width: 100%; }
.btn--lg { padding: 16px 32px; font-size: 1.05rem; }

/* ---------- Calculator card ---------- */
.calc-card {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow);
  margin-bottom: var(--sp-6);
}
.calc-card__title {
  font-family: var(--f-display); font-weight: 600;
  font-size: 1.4rem; margin: 0 0 var(--sp-2); color: var(--c-ink);
}
.calc-card__sub { color: var(--c-mute); margin-bottom: var(--sp-5); font-size: 0.95rem; }

/* Form */
.form-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4);
}
.form-grid--full { grid-template-columns: 1fr; }
.form-field { display: flex; flex-direction: column; }
.form-field--full { grid-column: 1 / -1; }
.form-field label {
  font-size: 0.88rem; font-weight: 600; color: var(--c-ink);
  margin-bottom: 6px;
}
.form-field__hint { font-size: 0.8rem; color: var(--c-mute); margin-top: 4px; }
.form-field input, .form-field select {
  padding: 12px 14px; border: 1.5px solid var(--c-line); border-radius: 8px;
  background: var(--c-paper); transition: border-color .15s, box-shadow .15s;
}
.form-field input:focus, .form-field select:focus {
  outline: none; border-color: var(--c-fern);
  box-shadow: 0 0 0 3px rgba(31,93,76,.12);
}

/* Radio group as pills */
.radio-pills { display: flex; gap: 8px; flex-wrap: wrap; }
.radio-pills input { position: absolute; opacity: 0; pointer-events: none; }
.radio-pills label {
  flex: 1; min-width: 120px;
  padding: 12px 16px; border: 1.5px solid var(--c-line);
  border-radius: 8px; text-align: center; cursor: pointer;
  font-weight: 500; font-size: 0.94rem;
  transition: border-color .15s, background .15s, color .15s;
  margin: 0;
}
.radio-pills input:checked + label {
  border-color: var(--c-fern); background: var(--c-fern-soft); color: var(--c-fern-dark);
}

/* ---------- Result block ---------- */
.result {
  margin-top: var(--sp-5); padding: var(--sp-5);
  background: linear-gradient(135deg, var(--c-fern-soft) 0%, #fff 100%);
  border-left: 4px solid var(--c-fern);
  border-radius: 0 var(--radius) var(--radius) 0;
  display: none;
}
.result.is-visible { display: block; animation: slideIn .35s ease-out; }
@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.result__primary {
  font-family: var(--f-display); font-size: 2.2rem; font-weight: 700;
  color: var(--c-fern-dark); line-height: 1; margin-bottom: 4px;
}
.result__primary span { font-size: 1.1rem; color: var(--c-mute); font-weight: 400; margin-left: 6px; }
.result__label { font-size: 0.88rem; color: var(--c-mute); text-transform: uppercase; letter-spacing: 0.08em; }
.result__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--sp-4); margin-top: var(--sp-4);
}
.result__item {
  background: rgba(255,255,255,.7); padding: var(--sp-3) var(--sp-4); border-radius: 8px;
}
.result__item-value { font-family: var(--f-display); font-size: 1.4rem; font-weight: 600; color: var(--c-ink); }
.result__item-label { font-size: 0.82rem; color: var(--c-mute); }

@media (max-width: 600px) {
  .form-grid { grid-template-columns: 1fr; }
  .calc-card { padding: var(--sp-5) var(--sp-4); }
  .result__primary { font-size: 1.8rem; }
}

/* ---------- Content sections ---------- */
.section { padding: var(--sp-8) 0; }
.section--alt { background: var(--c-paper); }
.section__intro { max-width: 720px; margin: 0 auto var(--sp-6); text-align: center; }
.section__intro h2 { margin-top: 0; }

/* Article body */
.prose {
  max-width: 720px; margin: 0 auto;
  font-size: 1.05rem; line-height: 1.75;
}
.prose h2 { padding-top: var(--sp-3); }
.prose h2::before {
  content: ''; display: block; width: 40px; height: 3px;
  background: var(--c-fern); margin-bottom: var(--sp-3); border-radius: 2px;
}
.prose blockquote {
  border-left: 3px solid var(--c-amber);
  padding: var(--sp-3) var(--sp-5);
  margin: var(--sp-5) 0;
  background: var(--c-amber-soft);
  font-family: var(--f-display); font-size: 1.1rem; font-style: italic;
  color: var(--c-ink); border-radius: 0 8px 8px 0;
}
.prose table {
  width: 100%; border-collapse: collapse; margin: var(--sp-5) 0;
  font-size: 0.95rem;
}
.prose th, .prose td {
  padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--c-line);
}
.prose thead { background: var(--c-fern-soft); }
.prose th { font-family: var(--f-display); font-weight: 600; color: var(--c-ink); }

/* Feature grid (calculator suite) */
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-4); margin-top: var(--sp-5);
}
.feature-card {
  display: block; padding: var(--sp-5); background: var(--c-paper);
  border: 1px solid var(--c-line); border-radius: var(--radius);
  text-decoration: none; color: var(--c-ink);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.feature-card:hover {
  border-color: var(--c-fern); transform: translateY(-2px);
  box-shadow: var(--shadow); color: var(--c-ink);
}
.feature-card__icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--c-fern-soft); color: var(--c-fern);
  display: grid; place-items: center; margin-bottom: var(--sp-3);
}
.feature-card h3 {
  font-size: 1.15rem; margin: 0 0 var(--sp-2); color: var(--c-ink);
}
.feature-card p { color: var(--c-mute); font-size: 0.94rem; margin: 0; }

/* ---------- FAQ ---------- */
.faq { max-width: 720px; margin: 0 auto; }
.faq__item {
  border-bottom: 1px solid var(--c-line);
  padding: var(--sp-4) 0;
}
.faq__q {
  display: flex; justify-content: space-between; align-items: center; gap: var(--sp-3);
  width: 100%; text-align: left; padding: 0;
  font-family: var(--f-display); font-size: 1.15rem; font-weight: 600; color: var(--c-ink);
}
.faq__q::after {
  content: '+'; font-size: 1.6rem; color: var(--c-fern); flex-shrink: 0;
  transition: transform .2s;
}
.faq__item[open] .faq__q::after { transform: rotate(45deg); }
.faq__a { padding-top: var(--sp-3); color: var(--c-body); }

/* ---------- Trust bar ---------- */
.trust-bar {
  display: flex; flex-wrap: wrap; justify-content: center; gap: var(--sp-5);
  padding: var(--sp-4); margin-top: var(--sp-6);
  font-size: 0.88rem; color: var(--c-mute);
}
.trust-bar__item { display: inline-flex; align-items: center; gap: 8px; }
.trust-bar__item svg { color: var(--c-fern); }

/* ---------- Ad slots ---------- */
.ad-slot {
  margin: var(--sp-6) auto;
  max-width: 728px;
  min-height: 90px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.02);
  border-radius: 8px;
}
.ad-label {
  font-size: 0.7rem; color: var(--c-mute); text-transform: uppercase;
  letter-spacing: 0.1em; text-align: center; margin-bottom: 4px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-ink); color: #c5cdc8;
  padding: var(--sp-7) 0 var(--sp-5); margin-top: var(--sp-9);
}
.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover { color: var(--c-amber); text-decoration: underline; }
.site-footer__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--sp-6);
}
.footer-heading {
  font-family: var(--f-display); font-size: 1rem; color: #fff;
  margin: 0 0 var(--sp-3);
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; font-size: 0.9rem; }
.footer-about { font-size: 0.88rem; color: #9aa5a0; }
.site-footer__bottom {
  margin-top: var(--sp-6); padding-top: var(--sp-4);
  border-top: 1px solid #2a3631;
  text-align: center; font-size: 0.82rem; color: #8a958f;
}

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  background: var(--c-ink); color: #fff; padding: var(--sp-4);
  box-shadow: 0 -4px 20px rgba(0,0,0,.15);
}
.cookie-banner__inner {
  max-width: var(--container); margin: 0 auto;
  display: flex; align-items: center; gap: var(--sp-4); flex-wrap: wrap;
}
.cookie-banner p { margin: 0; flex: 1; min-width: 280px; font-size: 0.92rem; }
.cookie-banner a { color: var(--c-amber); }
.cookie-banner__actions { display: flex; gap: var(--sp-2); }
.cookie-banner .btn--ghost { color: #fff; border-color: #444; }
.cookie-banner .btn--ghost:hover { border-color: #fff; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  font-size: 0.85rem; color: var(--c-mute);
  padding: var(--sp-4) 0 0;
}
.breadcrumb a { color: var(--c-mute); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-fern); }
.breadcrumb__sep { margin: 0 6px; color: var(--c-line); }

/* ---------- Page header ---------- */
.page-header {
  padding: var(--sp-6) 0 var(--sp-5);
}
.page-header h1 { margin: var(--sp-3) 0 var(--sp-3); }
.page-header__lead { font-size: 1.1rem; color: var(--c-body); max-width: 640px; }

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.hidden { display: none !important; }