/* === Clean Nordic Design System === */
:root {
  --primary: #2563eb;
  --secondary: #1e40af;
  --accent: #059669;
  --background: #fafafa;
  --surface: #ffffff;
  --card: #f5f5f5;
  --text: #171717;
  --muted: #737373;

  --font-heading: 'Merriweather', serif;
  --font-body: 'Open Sans', sans-serif;

  --border-radius: 8px;
  --shadow-subtle: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.07);

  --section-padding: 6rem 0;
}

/* === Global Styles & Resets === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--background);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--secondary);
}

h1 { font-size: 3rem; margin-bottom: 1rem; }
h2 { font-size: 2.25rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.75rem; color: var(--primary); }

p {
  margin-bottom: 1rem;
  color: var(--muted);
  max-width: 65ch;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--secondary);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius);
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.content-section {
    background-color: var(--surface);
    padding: var(--section-padding);
}

/* === Header & Navigation === */
.header {
  background-color: var(--surface);
  box-shadow: var(--shadow-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--text);
  font-weight: 700;
}

.logo-icon {
    color: var(--primary);
}

.main-nav ul {
  display: flex;
  gap: 2rem;
}

.main-nav a {
  color: var(--text);
  font-weight: 600;
  position: relative;
  padding: 0.5rem 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease-in-out;
}

.main-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

/* === Hero Section === */
.hero {
  position: relative;
  height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.7);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text);
    margin: 0 auto 2rem;
}

.cta-button {
  display: inline-block;
  background-color: var(--primary);
  color: var(--surface);
  padding: 1rem 2.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: background-color 0.3s ease, transform 0.2s ease;
  box-shadow: var(--shadow-medium);
}

.cta-button:hover {
  background-color: var(--secondary);
  color: var(--surface);
  transform: translateY(-2px);
}

/* === Trust Section === */
.trust-section {
    padding: 3rem 0;
    background-color: var(--background);
}

.trust-container {
    display: flex;
    justify-content: space-around;
    text-align: center;
}

.trust-item span {
    display: block;
    font-size: 2.5rem;
    font-family: var(--font-heading);
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.trust-item p {
    color: var(--muted);
    font-weight: 600;
}

/* === Intro Section === */
.intro-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.intro-text p:first-of-type {
    font-size: 1.1rem;
    color: var(--text);
}

/* === Basics Section === */
.basics-section {
    padding: var(--section-padding);
}

.basics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.card {
    background-color: var(--card);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-subtle);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.card-icon {
    color: var(--primary);
    margin-bottom: 1rem;
}
.card-icon svg {
    width: 32px;
    height: 32px;
}
.card h3 { color: var(--secondary); }

/* === Accordion (Strategien & FAQ) === */
.accordion {
    max-width: 900px;
    margin: 0 auto;
}
.accordion-item {
    background-color: var(--surface);
    border: 1px solid #e5e5e5;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow-subtle);
    overflow: hidden;
}
.accordion-header {
    width: 100%;
    background-color: transparent;
    border: none;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}
.accordion-header h3 { margin-bottom: 0; }
.accordion-icon {
    transition: transform 0.3s ease;
    color: var(--primary);
}
.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.accordion-content p { margin: 0; }
.accordion-content-inner {
    padding: 0 1.5rem 1.5rem;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: center;
}
.strategien-section .accordion-content-inner p { max-width: 100%; }
.faq-section .accordion-content { padding: 0 1.5rem 1.5rem; }

/* === Sparplan Section === */
.sparplan-section {
    background-color: var(--surface);
    padding: var(--section-padding);
}

.sparplan-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}
.sparplan-content .section-title { text-align: left; }
.steps { margin-top: 2rem; }
.step {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}
.step-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background-color: var(--accent);
    color: white;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-family: var(--font-heading);
}
.step-text h4 {
    margin-bottom: 0.25rem;
    color: var(--secondary);
}
.step-text p { margin: 0; font-size: 0.9rem; }

/* === KI Section === */
.ki-section .section-subtitle {
    max-width: 800px;
    margin: -1rem auto 3rem;
    text-align: center;
}
.feature-boxes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.feature-box img {
    margin-bottom: 1rem;
}
.feature-box h3 { color: var(--secondary); }

/* === Vergleich Section === */
.vergleich-section {
    padding: var(--section-padding);
}
.table-container {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--surface);
    box-shadow: var(--shadow-medium);
    border-radius: var(--border-radius);
    overflow: hidden;
}
th, td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid #e5e5e5;
}
th {
    background-color: var(--card);
    font-family: var(--font-heading);
    color: var(--secondary);
}
tbody tr:last-child td {
    border-bottom: none;
}
tbody tr:nth-child(even) {
    background-color: var(--background);
}

/* === Portfolio Section === */
.portfolio-section {
    background-color: var(--surface);
    padding: var(--section-padding);
}
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.portfolio-grid .card { text-align: center; }
.portfolio-grid img { margin: 0 auto 1.5rem; }
.portfolio-grid p:first-of-type { font-weight: 600; color: var(--text); }

/* === Ressourcen Section === */
.ressourcen-section {
    padding: var(--section-padding);
}
.ressourcen-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}
.ressource-card {
    display: block;
}
.ressource-link {
    margin-top: 1rem;
    display: inline-block;
    font-weight: 600;
    color: var(--primary);
}

/* === Contact Section === */
.contact-section {
    padding: var(--section-padding);
    background-color: var(--surface);
}
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.contact-info ul { margin-top: 2rem; }
.contact-info li { margin-bottom: 0.5rem; color: var(--muted); }
.contact-info li strong { color: var(--text); }

/* === Footer === */
.footer {
    background-color: #e5e5e5;
    padding-top: 4rem;
    color: var(--muted);
}
.footer-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}
.footer-column h4 {
    color: var(--text);
    margin-bottom: 1rem;
}
.footer-column p, .footer-column li { font-size: 0.9rem; }
.footer-column ul li { margin-bottom: 0.5rem; }
.footer-column a { color: var(--muted); }
.footer-column a:hover { color: var(--primary); }
.footer-bottom {
    background-color: #d4d4d4;
    padding: 1rem 0;
    margin-top: 3rem;
    font-size: 0.8rem;
}
.footer-bottom-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.disclaimer strong {
    color: var(--secondary);
}

/* === Animations === */
.fade-in {
    animation: fadeIn 1s ease-out forwards;
}
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.hero-content h1 { animation-delay: 0.2s; }
.hero-content p { animation-delay: 0.4s; }
.hero-content .cta-button { animation-delay: 0.6s; }
.trust-item.fade-in:nth-child(1) { animation-delay: 0.8s; }
.trust-item.fade-in:nth-child(2) { animation-delay: 1s; }
.trust-item.fade-in:nth-child(3) { animation-delay: 1.2s; }

/* === Responsive Design === */
@media (max-width: 1024px) {
    .intro-container, .sparplan-container, .contact-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .intro-image, .sparplan-image {
        max-width: 500px;
        margin: 0 auto;
    }
    .sparplan-content .section-title { text-align: center; }
    .basics-grid, .feature-boxes, .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html { font-size: 15px; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    --section-padding: 4rem 0;

    .main-nav {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--surface);
        box-shadow: var(--shadow-medium);
    }
    .main-nav.active { display: block; }
    .main-nav ul {
        flex-direction: column;
        padding: 1rem;
        gap: 0;
    }
    .main-nav li { width: 100%; }
    .main-nav a {
        display: block;
        padding: 1rem;
        text-align: center;
    }
    .main-nav a::after { display: none; }
    .mobile-nav-toggle { display: block; }

    .hero { height: auto; padding: 6rem 0; }
    .trust-container { flex-direction: column; gap: 2rem; }
    .basics-grid, .feature-boxes, .portfolio-grid, .ressourcen-grid {
        grid-template-columns: 1fr;
    }
    .accordion-content-inner {
        grid-template-columns: 1fr;
    }
    .footer-bottom-container {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}