:root {
    /* Farbpalette - Minimalistisch & Professionell */
    --bg: #ffffff;
    --surface: #fcfcfc;
    --text-main: #1d1d1f;
    --text-muted: #6e6e73;
    --primary: #2d3436;
    --accent: #0066cc;
    --border: #e5e5e7;
    --error: #d63031;
    --radius: 12px;
    --container-width: 1000px;
    --transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* Basis-Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg);
    font-weight: 300; /* Leichte Schrift für minimalistischen Look */
}

/* Typografie */
h1, h2, h3 {
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--primary);
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Navigation */
.site-header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    z-index: 1000;
    backdrop-filter: blur(20px);
}

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

.logo {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--primary);
}

.main-nav a {
    margin-left: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 400;
}

.main-nav a:hover {
    color: var(--text-main);
}

/* Hero-Sektion mit Rechner */
.hero-section {
    padding: 6rem 0;
    background: radial-gradient(circle at top right, #f8f9fa, #ffffff);
}

.intro-text {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 4rem;
}

.intro-text h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

/* Calculator Card */
.calculator-card {
    background: #fff;
    padding: 3rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.input-group input, 
.input-group select {
    width: 100%;
    padding: 0.85rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    background-color: #fafafa;
    transition: var(--transition);
}

.input-group input:focus, 
.input-group select:focus {
    outline: none;
    border-color: var(--accent);
    background-color: #fff;
}

.calc-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 400;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    padding: 1rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.95rem;
}

/* Ergebnisanzeige */
.results-area {
    margin-top: 3rem;
    padding: 2rem;
    background-color: #fafafa;
    border-radius: var(--radius);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.5rem;
}

.result-label {
    font-size: 1.2rem;
    color: var(--text-muted);
}

.result-value {
    font-size: 2.5rem;
    color: var(--text-main);
    font-weight: 400;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    font-size: 0.95rem;
}

.result-info-box {
    margin-top: 2rem;
    padding: 1rem;
    border-left: 3px solid var(--accent);
    background: #fff;
    font-size: 0.9rem;
}

.warning-text {
    color: var(--error);
    margin-top: 0.5rem;
    font-weight: 400;
}

/* Accordion Sektion */
.faq-section {
    padding: 8rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
    font-size: 2rem;
}

.accordion {
    max-width: 850px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    padding: 2rem 0;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.15rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: inherit;
    font-weight: 400;
    color: var(--text-main);
}

.accordion-header .icon::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.accordion-item.active .icon::after {
    transform: rotate(45deg);
}

.accordion-content {
    max-height: 0;
    opacity: 0;
    transition: all 0.4s ease;
}

.accordion-item.active .accordion-content {
    max-height: 3000px; /* Erlaubt lange SEO-Texte */
    opacity: 1;
}

.rich-text {
    padding-bottom: 3rem;
    color: var(--text-muted);
    font-size: 1.05rem;
}

.rich-text p {
    margin-bottom: 1.5rem;
}

/* Info & Kontakt Sektion */
.info-section {
    padding: 6rem 0;
    background-color: var(--surface);
    border-top: 1px solid var(--border);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
}

.info-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
}

/* Footer */
.site-footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-nav a {
    margin-left: 2rem;
    color: inherit;
}

.footer-nav a:hover {
    color: var(--text-main);
}

/* Responsive Anpassungen */
@media (max-width: 768px) {
    html { font-size: 15px; }
    .header-content { flex-direction: column; gap: 1.5rem; }
    .main-nav { display: flex; gap: 1rem; }
    .main-nav a { margin: 0; }
    
    .intro-text h1 { font-size: 1.8rem; }
    .calculator-card { padding: 1.5rem; }
    .calc-actions { flex-direction: column; }
    
    .footer-content { flex-direction: column; gap: 2rem; text-align: center; }
    .footer-nav a { margin: 0 0.75rem; }
}