/* ===== SETUP & VARIABLES ===== */
:root {
  --primary: #0ea5e9; /* Himmelblau */
  --secondary: #8b5cf6; /* Violett */
  --accent: #22c55e; /* Grün */
  --background: #f0f9ff; /* Sehr helles Blau */
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border-color: #e2e8f0;

  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  --transition: all 0.3s ease;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* Offset for sticky header */
}

body {
  font-family: var(--font-body);
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

/* ===== UTILITIES & REUSABLE COMPONENTS ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

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

.section--colored-bg {
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: white;
}
.section--colored-bg .section__title {
    color: white;
}

.section__title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 24px;
  color: var(--text);
}

.section__intro {
  max-width: 700px;
  margin: 0 auto 48px;
  text-align: center;
  color: var(--muted);
  font-size: 1.125rem;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--3-cols {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn--primary {
  background-color: var(--primary);
  color: white;
}
.btn--primary:hover {
  background-color: #0284c7;
  transform: translateY(-2px);
}

.btn--secondary {
  background-color: var(--surface);
  color: var(--primary);
  border: 1px solid var(--border-color);
}
.btn--secondary:hover {
  background-color: #f8fafc;
  border-color: var(--primary);
}

.badge {
  display: inline-block;
  background-color: rgba(14, 165, 233, 0.1);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.875rem;
}

/* Fade-in animation on scroll */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== HEADER ===== */
.header {
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}
.header__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
}
.logo__icon {
  color: var(--primary);
}
.logo__text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
}
.nav__list {
  display: flex;
  list-style: none;
  gap: 32px;
}
.nav__link {
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  position: relative;
  transition: var(--transition);
}
.nav__link:hover {
  color: var(--primary);
}
.nav__link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary);
    transition: width 0.3s;
}
.nav__link:hover::after {
    width: 100%;
}
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: 80px 0;
  overflow: hidden;
}
.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
}
.hero__content h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  margin: 16px 0 24px;
  line-height: 1.2;
}
.subheadline {
  font-size: 1.25rem;
  color: var(--muted);
  margin-bottom: 32px;
}
.hero__buttons {
  display: flex;
  gap: 16px;
}
.hero__image-wrapper {
    position: relative;
}
.hero__image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

/* ===== TRUST BADGES ===== */
.trust-badges {
  padding-bottom: 80px;
}
.trust-badges__container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  gap: 24px;
}
.trust-badge {
  display: flex;
  align-items: center;
  gap: 12px;
}
.trust-badge i {
  color: var(--secondary);
  width: 24px;
  height: 24px;
}
.trust-badge strong {
  display: block;
}
.trust-badge span {
  color: var(--muted);
  font-size: 0.875rem;
}

/* ===== GRUNDLAGEN ===== */
.lern-modul {
  display: flex;
  flex-direction: column;
}
.lern-modul__header {
  margin-bottom: 16px;
}
.lern-modul__tag {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 8px;
    display: block;
}
.lern-modul h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
}
.lern-modul__list {
  list-style: none;
  padding-left: 20px;
  flex-grow: 1;
}
.lern-modul__list li {
  position: relative;
  margin-bottom: 8px;
}
.lern-modul__list li::before {
  content: '✓';
  color: var(--accent);
  position: absolute;
  left: -20px;
}
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 99px;
  margin-top: 24px;
  overflow: hidden;
}
.progress-bar div {
  height: 100%;
  background-color: var(--accent);
  border-radius: 99px;
}
.magic-triangle-container {
    margin-top: 64px;
    text-align: center;
}
.magic-triangle-container h3 {
    font-family: var(--font-heading);
    margin-bottom: 32px;
}
.magic-triangle {
    position: relative;
    width: 300px;
    height: 260px;
    margin: 32px auto;
}
.magic-triangle__corner {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}
.magic-triangle__corner i {
    width: 32px;
    height: 32px;
}
.magic-triangle__corner--top { top: 0; left: 50%; transform: translateX(-50%); color: var(--accent); }
.magic-triangle__corner--left { bottom: 0; left: 0; color: var(--primary); }
.magic-triangle__corner--right { bottom: 0; right: 0; color: var(--secondary); }
.magic-triangle::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 25px;
    width: 0;
    height: 0;
    border-left: 125px solid transparent;
    border-right: 125px solid transparent;
    border-bottom: 216px solid rgba(139, 92, 246, 0.1);
}
.magic-triangle__center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -20%);
    width: 120px;
    text-align: center;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ===== ETFS ===== */
.etf-intro {
    max-width: 700px;
    margin: 0 auto 48px;
    text-align: center;
    font-size: 1.25rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}
.icon-feature {
    text-align: center;
}
.icon-feature i {
    width: 48px;
    height: 48px;
    color: var(--primary);
    background-color: rgba(14, 165, 233, 0.1);
    border-radius: 50%;
    padding: 12px;
    margin-bottom: 16px;
}
.icon-feature h4 {
    font-family: var(--font-heading);
    margin-bottom: 4px;
}
.icon-feature p {
    color: var(--muted);
}
.popular-indices {
    margin-top: 48px;
    background-color: var(--background);
    padding: 24px;
    border-radius: var(--radius-lg);
}
.popular-indices h4 { font-family: var(--font-heading); }
.popular-indices ul {
    list-style: none;
    margin-top: 16px;
}
.popular-indices li { margin-bottom: 8px; }
.warning-box {
    display: flex;
    gap: 16px;
    background-color: #fffbeb;
    color: #b45309;
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-top: 48px;
    border-left: 4px solid #f59e0b;
}
.warning-box i {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: #f59e0b;
}
.warning-box h4 {
    color: #92400e;
}

/* ===== DEPOT ===== */
.timeline {
  list-style: none;
  position: relative;
  margin: 48px auto;
  max-width: 800px;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 19px;
  height: 100%;
  width: 2px;
  background: var(--border-color);
}
.timeline__item {
  margin-bottom: 48px;
  position: relative;
  padding-left: 60px;
}
.timeline__icon {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--secondary);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 700;
  font-family: var(--font-heading);
}
.timeline__content h4 {
    font-family: var(--font-heading);
    margin-bottom: 8px;
}
.table-container {
    margin-top: 48px;
}
.table-container h4 {
    text-align: center;
    font-family: var(--font-heading);
    margin-bottom: 16px;
}
table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    background: var(--surface);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
th, td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}
th {
    background-color: var(--background);
    font-weight: 600;
}
tbody tr:last-child td {
    border-bottom: none;
}
tbody tr:hover {
    background-color: #f8fafc;
}

/* ===== SPARPLAN-RECHNER ===== */
.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.calculator__input-area .section__title, .calculator__input-area p {
    text-align: left;
}
.calculator__input-area .section__title {
    margin-bottom: 16px;
}
.calculator__input-area p {
    max-width: none;
    margin: 0 0 32px;
}
.form-group {
    margin-bottom: 24px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}
.form-group input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    outline: none;
}
.form-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--surface);
    cursor: pointer;
    border-radius: 50%;
}
.calculator__output-area {
    padding: 32px;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.output-label {
    color: var(--muted);
    font-size: 0.875rem;
}
.output-value {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-heading);
}
.output-value--primary { color: var(--primary); }
.output-value--accent { color: var(--accent); }
.calculator__output-area hr {
    border: none;
    height: 1px;
    background-color: var(--border-color);
}
.disclaimer {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 16px;
}

/* ===== HÄUFIGE FEHLER ===== */
.error-card {
    border-left: 4px solid #ef4444;
}
.error-card h4 {
    font-family: var(--font-heading);
    margin-bottom: 8px;
}

/* ===== FAQ ===== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    background: var(--surface);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.faq-item summary {
    padding: 16px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.2s;
}
.faq-item[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}
.faq-item p {
    padding: 0 16px 16px;
    color: var(--muted);
}

/* ===== KONTAKT ===== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: center;
}
.contact-info .section__title, .contact-info p { text-align: left; }
.contact-info .section__title { margin-bottom: 16px; }
.contact-info p { margin: 0 0 32px; max-width: none; }
.contact-info ul {
    list-style: none;
}
.contact-info li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 1.125rem;
}
.contact-info i {
    color: var(--primary);
}
.contact-form .form-group {
    margin-bottom: 16px;
}
.contact-form label {
    display: block;
    margin-bottom: 4px;
    font-weight: 500;
    font-size: 0.875rem;
}
.contact-form input, .contact-form select, .contact-form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
}
.form-group-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
}
.contact-form button {
    width: 100%;
    margin-top: 16px;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--text);
    color: #a1a1aa;
    padding-top: 64px;
}
.footer__container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 64px;
}
.footer .logo {
    color: white;
    margin-bottom: 16px;
}
.footer .tagline {
    margin-bottom: 16px;
}
.footer h4 {
    font-family: var(--font-heading);
    color: white;
    margin-bottom: 16px;
}
.footer ul {
    list-style: none;
}
.footer ul li {
    margin-bottom: 12px;
}
.footer a {
    text-decoration: none;
    color: #a1a1aa;
    transition: var(--transition);
}
.footer a:hover {
    color: var(--primary);
}
.newsletter-form {
    display: flex;
    position: relative;
}
.newsletter-form input {
    width: 100%;
    padding: 10px 40px 10px 12px;
    background: #27272a;
    border: 1px solid #3f3f46;
    border-radius: var(--radius-sm);
    color: white;
}
.newsletter-form button {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--muted);
    cursor: pointer;
    padding: 4px;
}
.footer__bottom {
    background-color: #09090b;
    padding: 16px 0;
    font-size: 0.875rem;
}
.footer__bottom .container {
    display: flex;
    justify-content: space-between;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 992px) {
  .hero__container, .calculator-container, .contact-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero__content, .calculator__input-area, .contact-info {
      text-align: center;
  }
  .hero__content .section__title, .calculator__input-area .section__title, .contact-info .section__title,
  .hero__content p, .calculator__input-area p, .contact-info p {
      text-align: center;
  }
  .hero__buttons, .contact-info ul {
    justify-content: center;
  }
  .hero__image-wrapper {
    order: -1;
  }
  .footer__container {
      grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section__title {
      font-size: 2rem;
  }
  .hero__content h1 {
      font-size: 2.5rem;
  }
  
  .nav__list {
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      background-color: var(--surface);
      flex-direction: column;
      align-items: center;
      gap: 0;
      padding: 16px 0;
      box-shadow: var(--shadow-md);
      transform: translateY(-110%);
      transition: transform 0.3s ease-in-out;
  }
  .nav__list.active {
      transform: translateY(0);
  }
  .nav__list li {
      width: 100%;
      text-align: center;
  }
  .nav__link {
      display: block;
      padding: 16px;
  }
  .nav__toggle {
      display: block;
  }
}

@media (max-width: 576px) {
  .footer__container {
      grid-template-columns: 1fr;
  }
  .footer__bottom .container {
      flex-direction: column;
      text-align: center;
      gap: 8px;
  }
}