/* ==========================================================================
   partner.immobilien-steuerrechner.de - Stylesheet
   Direct copy of immobilien-steuerrechner.de design system
   ========================================================================== */

/* --- Custom Properties --- */
:root {
  /* Colors - immobilien-steuerrechner.de design system */
  --color-primary: #1C3D2E;
  --color-primary-light: #2E5A3E;
  --color-primary-dark: #1C3D2E;
  --color-accent: #1C3D2E;
  --color-accent-light: #EDF3EF;
  --color-accent-dark: #2E5A3E;
  --color-link: #1C3D2E;
  --color-link-hover: #2E5A3E;
  --color-success: #00875A;
  --color-warning: #d97706;
  --color-error: #dc2626;
  --color-bg: #FAF8F4;
  --color-white: #ffffff;
  --color-text: #1A2A1E;
  --color-text-secondary: #4A5E50;
  --color-text-light: #7A8E80;
  --color-border: #E0D9CE;
  --color-border-light: #EAE4DA;

  /* Typography */
  --heading-font: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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;
  --font-size-5xl: 3rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;

  /* Shadows - forest green tinted */
  --shadow-sm: 0 1px 2px rgba(28, 61, 46, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(28, 61, 46, 0.07), 0 2px 4px -2px rgba(28, 61, 46, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(28, 61, 46, 0.08), 0 4px 6px -4px rgba(28, 61, 46, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(28, 61, 46, 0.08), 0 8px 10px -6px rgba(28, 61, 46, 0.04);

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 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: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary-dark);
}

h1, h2 {
  font-family: var(--heading-font);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-md);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-accent {
  color: var(--color-accent);
}

.text-center {
  text-align: center;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section--gray {
  background-color: var(--color-bg);
}

.section--white {
  background-color: var(--color-white);
}

/* --- Navigation --- */
.nav {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
}

.nav__logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav__links a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav__links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.25rem;
  background: var(--color-accent);
  color: var(--color-white) !important;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: background var(--transition-fast);
}

.nav__cta:hover {
  background: var(--color-accent-dark);
  color: var(--color-white) !important;
  text-decoration: none;
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav__mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 5px 0;
  transition: var(--transition-fast);
}

/* --- Hero (matches main site grid layout) --- */
.hero {
  background-color: #F0EBE1;
  color: var(--color-text);
  padding: var(--spacing-4xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: radial-gradient(circle, rgba(0, 0, 0, 0.045) 1px, transparent 1px);
  background-size: 18px 18px;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero__text h1 {
  color: var(--color-text);
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
}

.hero__text p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero__badges {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  background: rgba(28, 61, 46, 0.08);
  border: 1px solid rgba(28, 61, 46, 0.15);
  border-radius: 100px;
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.hero__badge svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --- Signup Card (mirrors calculator widget on main site) --- */
.signup-card {
  background: var(--color-white);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
  color: var(--color-text);
}

.signup-card__title {
  font-size: var(--font-size-2xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-xs);
}

.signup-card__subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.signup-card .form-label {
  color: var(--color-primary);
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  transition: box-shadow var(--transition-base);
}

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

.card--bordered {
  border: 1px solid var(--color-border);
  box-shadow: none;
}

.card--bordered:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px;
}

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

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-bg);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: var(--font-size-lg);
}

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

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

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

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

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(28, 61, 46, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-light);
}

.form-error-msg {
  font-size: var(--font-size-sm);
  color: var(--color-error);
  margin-top: var(--spacing-sm);
}

.form-error-msg:empty {
  display: none;
}

/* --- Checkbox --- */
.form-group--checkbox {
  margin-bottom: var(--spacing-lg);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.form-checkbox input[type="checkbox"] {
  display: none;
}

.form-checkbox__mark {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  margin-top: 1px;
  transition: all var(--transition-fast);
  position: relative;
}

.form-checkbox input:checked + .form-checkbox__mark {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.form-checkbox input:checked + .form-checkbox__mark::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 6px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-checkbox__label a {
  color: var(--color-accent);
  text-decoration: underline;
}

.form-checkbox__label a:hover {
  color: var(--color-accent-dark);
}

/* --- Textarea --- */
.form-textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.6;
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

/* --- Referral Page --- */
.referral-page__header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.referral-page__header h1 {
  margin-bottom: var(--spacing-md);
}

.referral-page__header p {
  font-size: var(--font-size-lg);
}

/* --- Trust Section (from main site) --- */
.trust {
  padding: var(--spacing-2xl) 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
}

.trust__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  text-align: center;
}

.trust__item {
  padding: var(--spacing-md);
}

.trust__number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.trust__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

/* --- Info Box (from main site) --- */
.info-box {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  background: rgba(28, 61, 46, 0.04);
  border: 1px solid rgba(28, 61, 46, 0.15);
  border-radius: var(--border-radius-lg);
}

.info-box__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(28, 61, 46, 0.1);
  border-radius: var(--border-radius);
  color: var(--color-accent);
}

.info-box__icon svg {
  width: 20px;
  height: 20px;
}

.info-box__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.info-box__text strong {
  color: var(--color-primary-dark);
  font-size: var(--font-size-base);
}

/* --- Features Grid (from main site) --- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(28, 61, 46, 0.08);
  border-radius: var(--border-radius-lg);
  color: var(--color-accent);
}

.feature__icon svg {
  width: 28px;
  height: 28px;
}

.feature h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.feature p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- Steps (from main site) --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  counter-reset: step;
}

.step {
  position: relative;
  padding: var(--spacing-xl);
  text-align: center;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin: 0 auto var(--spacing-md);
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.step h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.step p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- FAQ (from main site) --- */
.faq__list {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  min-height: 44px;
}

.faq__question::after {
  content: '+';
  font-size: var(--font-size-xl);
  color: var(--color-accent);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
  margin-left: var(--spacing-md);
}

.faq__item.active .faq__question::after {
  content: '-';
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq__item.active .faq__answer {
  max-height: 500px;
}

.faq__answer p {
  padding-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

/* --- Signup Result --- */
.signup-result {
  text-align: center;
  padding: var(--spacing-lg) 0;
}

.signup-result__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(28, 61, 46, 0.1);
  border-radius: 50%;
  color: var(--color-accent);
}

.signup-result__icon svg {
  width: 28px;
  height: 28px;
}

.signup-result__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-lg);
}

.signup-result__hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
  margin-bottom: 0;
  line-height: 1.7;
}

/* --- Footer (from main site) --- */
.footer {
  background: #1C3D2E;
  color: rgba(232, 237, 232, 0.7);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer__brand p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  max-width: 300px;
}

.footer__heading {
  color: rgba(232, 237, 232, 0.45);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
}

.footer__links {
  list-style: none;
}

.footer__links li {
  margin-bottom: var(--spacing-sm);
}

.footer__links a {
  color: rgba(232, 237, 232, 0.7);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: #E8EDE8;
  text-decoration: none;
}

.footer__bottom {
  border-top: 1px solid rgba(232, 237, 232, 0.1);
  padding-top: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
}

.footer__bottom a {
  color: rgba(232, 237, 232, 0.5);
}

.footer__bottom a:hover {
  color: #E8EDE8;
}

/* --- Utility --- */
.hidden {
  display: none !important;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__text p {
    max-width: none;
  }

  .hero__badges {
    justify-content: center;
  }

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

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

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

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  .nav__links {
    display: none;
  }

  .nav__mobile-toggle {
    display: block;
  }

  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
  }

  .features,
  .steps {
    grid-template-columns: 1fr;
  }

  .trust__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .info-box {
    flex-direction: column;
  }

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

  .footer__bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .card {
    padding: var(--spacing-lg);
  }

  .signup-card {
    padding: var(--spacing-lg);
  }

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

  .hero__badges {
    gap: var(--spacing-sm);
  }

  .hero__badge {
    font-size: var(--font-size-xs);
    padding: 0.25rem 0.5rem;
  }

  .trust__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

  .trust__number {
    font-size: var(--font-size-2xl);
  }

  .footer__bottom {
    font-size: 0.6875rem;
  }
}

@media (max-width: 360px) {
  .container {
    padding: 0 0.75rem;
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

  .hero__text h1 {
    font-size: 1.375rem;
  }

  .hero__text p {
    font-size: var(--font-size-base);
  }

  .btn--lg {
    padding: 0.75rem 1.25rem;
    font-size: var(--font-size-base);
  }
}