/* ============================================================
   finanzberechner.de – Global CSS
   Stand: 2026
   Beschreibung: Zentrale Stylesheet-Datei für alle Seiten.
   Enthält: Variablen, Reset, Typography, Layout, Header, Footer,
   Dark/Light-Theme, AdSense-Wrapper, Tooltip-System, Buttons,
   Formulare, Cards, Breadcrumb, Responsive Grid.
   ============================================================ */

/* --- CSS Custom Properties (Light Theme als Default) --- */
:root {
  /* Farbpalette – Professionell, Seriös, Deutsch */
  --color-primary: #1a3c5e;          /* Tiefes Blau – Vertrauen */
  --color-primary-dark: #0f2840;
  --color-primary-light: #2c5f8f;
  --color-accent: #c7952b;           /* Gold-Akzent – Wertigkeit */
  --color-accent-hover: #a87a1e;
  --color-success: #2d7d46;
  --color-error: #c2313d;
  --color-warning: #d4880f;

  /* Hintergründe Light */
  --bg-body: #f5f6f8;
  --bg-surface: #ffffff;
  --bg-surface-alt: #eef1f5;
  --bg-header: #ffffff;
  --bg-footer: #1a3c5e;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-tooltip: #1a3c5e;

  /* Text Light */
  --text-primary: #1a1c20;
  --text-secondary: #4a4e56;
  --text-tertiary: #6e737d;
  --text-inverse: #ffffff;
  --text-link: #1a3c5e;
  --text-link-hover: #0f2840;
  --text-footer: #c5cdd8;
  --text-footer-heading: #ffffff;

  /* Borders */
  --border-color: #d4d8df;
  --border-color-light: #e6e9ee;
  --border-input: #b8bec6;
  --border-input-focus: #1a3c5e;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 48px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Layout */
  --max-width: 1200px;
  --header-height: 68px;
  --sidebar-width: 300px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --bg-body: #111418;
  --bg-surface: #1a1e24;
  --bg-surface-alt: #22262e;
  --bg-header: #1a1e24;
  --bg-footer: #0d1014;
  --bg-card: #1a1e24;
  --bg-input: #22262e;
  --bg-tooltip: #2c323a;

  --text-primary: #e4e6ea;
  --text-secondary: #b0b6c0;
  --text-tertiary: #848a94;
  --text-inverse: #ffffff;
  --text-link: #6b9fd4;
  --text-link-hover: #8db8e8;
  --text-footer: #848a94;
  --text-footer-heading: #c5cdd8;

  --border-color: #2c323a;
  --border-color-light: #22262e;
  --border-input: #3a404a;
  --border-input-focus: #6b9fd4;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.20);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.30);
  --shadow-xl: 0 20px 48px rgba(0,0,0,0.35);
}

/* --- Reset --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 700;
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); margin-bottom: var(--space-lg); }
h2 { font-size: var(--font-size-3xl); margin-bottom: var(--space-md); }
h3 { font-size: var(--font-size-2xl); margin-bottom: var(--space-md); }
h4 { font-size: var(--font-size-xl); margin-bottom: var(--space-sm); }
h5 { font-size: var(--font-size-lg); margin-bottom: var(--space-sm); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* --- Container & Grid --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.page-layout {
  display: flex;
  gap: var(--space-xl);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-3xl);
}

.page-layout__main {
  flex: 1;
  min-width: 0;
}

.page-layout__sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

/* --- Header --- */
.site-header {
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-md);
}

.site-header__logo img {
  height: 38px;
  width: auto;
  display: block;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.site-header__nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.site-header__nav a:hover,
.site-header__nav a.active {
  background-color: var(--bg-surface-alt);
  text-decoration: none;
  color: var(--text-primary);
}

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown__toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  background: none;
  border: none;
  font-family: inherit;
  transition: background-color var(--transition-fast);
  white-space: nowrap;
}

.dropdown__toggle:hover {
  background-color: var(--bg-surface-alt);
}

.dropdown__toggle::after {
  content: '';
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-left: 2px;
  margin-top: -3px;
}

.dropdown__menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 240px;
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  z-index: 1001;
}

/* Dropdown: Hover offnet/schliesst automatisch */
.dropdown:hover .dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown:hover .dropdown__toggle::after {
  transform: rotate(-135deg);
  margin-top: 2px;
}

.dropdown__menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.theme-toggle:hover {
  background-color: var(--bg-surface-alt);
}

/* Mobile Hamburger */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --- Footer --- */
.site-footer {
  background-color: var(--bg-footer);
  color: var(--text-footer);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: auto;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.site-footer h4 {
  color: var(--text-footer-heading);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.site-footer ul {
  list-style: none;
}

.site-footer ul li {
  margin-bottom: var(--space-sm);
}

.site-footer ul li a {
  color: var(--text-footer);
  font-size: var(--font-size-sm);
}

.site-footer ul li a:hover {
  color: var(--text-footer-heading);
}

.site-footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
}

.site-footer__disclaimer {
  font-size: var(--font-size-xs);
  color: var(--text-footer);
  max-width: 600px;
  line-height: var(--line-height-relaxed);
}

.site-footer__copyright {
  white-space: nowrap;
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: var(--space-md) 0;
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--text-tertiary);
  margin-left: var(--space-xs);
}

.breadcrumb a {
  color: var(--text-tertiary);
}

.breadcrumb a:hover {
  color: var(--text-link);
}

.breadcrumb li:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

/* --- Cards --- */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card--clickable {
  cursor: pointer;
}

.card--clickable:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card__icon {
  width: 48px;
  height: 48px;
  background-color: var(--bg-surface-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: var(--font-size-xl);
  color: var(--color-primary);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.card__description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-relaxed);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  border: 2px solid transparent;
  white-space: nowrap;
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover {
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #ffffff;
}

.btn--accent {
  background-color: var(--color-accent);
  color: #1a1c20;
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #1a1c20;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn--sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
}

.btn--lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
}

.btn--block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.form-label__required {
  color: var(--color-error);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--text-primary);
  background-color: var(--bg-input);
  border: 2px solid var(--border-input);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  line-height: 1.5;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-input-focus);
  box-shadow: 0 0 0 3px rgba(26,60,94,0.1);
}

.form-input--error,
.form-select--error {
  border-color: var(--color-error);
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
}

.form-hint {
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
}

.form-optional {
  color: var(--text-tertiary);
  font-weight: 400;
  font-size: var(--font-size-xs);
}

/* --- Tooltip --- */
.tooltip-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--border-color);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 700;
  font-style: normal;
  cursor: pointer;
  margin-left: var(--space-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  border: none;
  font-family: inherit;
  line-height: 1;
}

.tooltip-icon:hover,
.tooltip-icon:focus {
  background-color: var(--color-primary);
  color: #ffffff;
  outline: none;
}

.tooltip-popup {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-tooltip);
  color: #ffffff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-relaxed);
  white-space: normal;
  width: 260px;
  z-index: 1002;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  pointer-events: none;
  text-align: left;
  font-weight: 400;
}

.tooltip-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--bg-tooltip);
}

.tooltip-popup--visible {
  opacity: 1;
  visibility: visible;
}

/* ============================================================
   ADSENSE STYLES - Transparent mit kleiner Border
   ============================================================ */

.adsense-block {
  background-color: transparent;
  border: 0.5px solid var(--border-color-light);
  border-radius: var(--radius-sm);
  padding: var(--space-sm);
  text-align: center;
  margin: var(--space-xl) 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
}

.adsense-block::before {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.adsense-block--header {
  min-height: 90px;
}

.adsense-block--sidebar {
  min-height: 600px;
}

.adsense-block--footer {
  min-height: 90px;
}

.adsense-block--inline {
  min-height: 250px;
}


/* --- Results Table --- */
.result-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: var(--font-size-sm);
}

.result-table th,
.result-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color-light);
}

.result-table th {
  background-color: var(--bg-surface-alt);
  font-weight: 600;
  color: var(--text-primary);
}

.result-table tr:last-child td {
  border-bottom: 2px solid var(--color-primary);
  font-weight: 700;
  font-size: var(--font-size-base);
  color: var(--color-primary);
}

.result-highlight {
  background-color: var(--bg-surface-alt);
  border: 2px solid var(--color-success);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

.result-highlight__label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.result-highlight__value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-success);
}

/* --- FAQ Section --- */
.faq-section {
  margin-top: var(--space-3xl);
}

.faq-item {
  border: 1px solid var(--border-color-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  background-color: var(--bg-card);
}

.faq-item__question {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: none;
  border: none;
  font-size: var(--font-size-base);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
  color: var(--text-primary);
}

.faq-item__question::after {
  content: '+';
  font-size: var(--font-size-xl);
  font-weight: 300;
  transition: transform var(--transition-fast);
}

.faq-item--open .faq-item__question::after {
  content: '\2212';
}

.faq-item__answer {
  padding: 0 var(--space-lg) var(--space-md);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  display: none;
}

.faq-item--open .faq-item__answer {
  display: block;
}

/* --- SEO Content Section --- */
.seo-content {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-color-light);
}

.seo-content h2 {
  font-size: var(--font-size-2xl);
}

.seo-content h3 {
  font-size: var(--font-size-xl);
}

.seo-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
}

.seo-content table th,
.seo-content table td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color);
  text-align: left;
  font-size: var(--font-size-sm);
}

.seo-content table th {
  background-color: var(--bg-surface-alt);
  font-weight: 600;
}

/* --- Download Buttons --- */
.download-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin: var(--space-lg) 0;
}

/* --- Search Bar (Homepage) --- */
.search-bar {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}

.search-bar__input {
  width: 100%;
  padding: var(--space-md) var(--space-xl) var(--space-md) var(--space-2xl);
  font-size: var(--font-size-lg);
  border: 2px solid var(--border-input);
  border-radius: var(--radius-xl);
  background-color: var(--bg-input);
  font-family: inherit;
  color: var(--text-primary);
}

.search-bar__input:focus {
  outline: none;
  border-color: var(--border-input-focus);
  box-shadow: 0 0 0 4px rgba(26,60,94,0.08);
}

.search-bar__icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--border-color-light);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--space-sm) var(--space-lg);
  border: none;
  background: none;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  font-family: inherit;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-panel {
  display: none;
}

.tab-panel--active {
  display: block;
}

/* --- Info Banner --- */
.info-banner {
  background-color: var(--bg-surface-alt);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-lg) 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* --- Calculator Grid Form --- */
.calc-form {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.calc-form__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md) var(--space-xl);
}

.calc-form__full {
  grid-column: 1 / -1;
}

.calc-form__actions {
  margin-top: var(--space-xl);
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .page-layout {
    flex-direction: column;
  }

  .page-layout__sidebar {
    width: 100%;
  }

  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .hamburger {
    display: flex;
  }

  .site-header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-header);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    gap: var(--space-xs);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 999;
  }

  .site-header__nav--open {
    transform: translateX(0);
  }

  /* Auf Mobilgeraten: Hover deaktiviert, nur Klick */
  .dropdown:hover .dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }

  .dropdown__menu {
    position: static;
    box-shadow: none;
    border: none;
    background-color: transparent;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding-left: var(--space-lg);
    display: none;
  }

  .dropdown--open .dropdown__menu,
  .dropdown--open:hover .dropdown__menu {
    display: block;
  }

  .dropdown:hover .dropdown__toggle::after {
    transform: rotate(45deg);
    margin-top: -3px;
  }

  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }

  .calc-form__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom {
    flex-direction: column;
  }

  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }

  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .calc-form {
    padding: var(--space-md);
  }
}

@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
  .download-group { flex-direction: column; }
  .download-group .btn { width: 100%; }
}

/* --- Print Styles --- */
@media print {
  .site-header,
  .site-footer,
  .adsense-block,
  .btn,
  .theme-toggle,
  .hamburger,
  .breadcrumb {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  z-index: 1003;
  font-size: var(--font-size-sm);
}

.skip-link:focus {
  top: var(--space-md);
}

/* --- Loading Spinner --- */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}