/* Basis-Layout & Typografie */
* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #1f2933;
    background: #f4f7fb;
    line-height: 1.6;
}

a {
    color: #1b4b8f;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

h1,
h2,
h3 {
    margin-top: 0;
    color: #102a43;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: linear-gradient(90deg, #102a43, #1b4b8f);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.35);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    gap: 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: #102a43;
    background: #f9fafb;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-weight: 600;
    font-size: 1rem;
}

.brand-tagline {
    font-size: 0.8rem;
    opacity: 0.9;
}

.main-nav {
    display: flex;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.nav-link {
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    color: #e5ecf5;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
    background: rgba(15, 23, 42, 0.3);
}

.nav-link.active {
    background: #f9fafb;
    color: #102a43;
}

/* Hero */
.hero {
    padding: 2.5rem 0 1.5rem;
}

.hero-inner {
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.hero-text {
    max-width: 720px;
}

.hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 1.1rem;
}

.hero-benefits {
    margin: 0;
    padding-left: 1.1rem;
    font-size: 0.95rem;
}

.hero-benefits li {
    margin-bottom: 0.25rem;
}

/* Sektion Standard */
.section-header {
    margin-bottom: 1.5rem;
}

.section-header h2 {
    margin-bottom: 0.35rem;
}

.section-intro {
    margin: 0;
    color: #52606d;
    font-size: 0.95rem;
}

/* Calculator-Layout */
.calculator-section {
    padding: 1.5rem 0 2.5rem;
}

.calculator-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: flex-start;
}

.calculator-card,
.result-card {
    background: #ffffff;
    border-radius: 1rem;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.calculator-card {
    border-top: 3px solid #1b4b8f;
}

.result-card {
    border-top: 3px solid #0e7c86;
}

.calculator-mode {
    margin-bottom: 1rem;
}

.field-group {
    margin-bottom: 0.85rem;
}

.field-label {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    color: #52606d;
}

.field-input {
    width: 100%;
    padding: 0.55rem 0.6rem;
    border-radius: 0.55rem;
    border: 1px solid #cbd2d9;
    font-size: 0.95rem;
    background: #f9fafb;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.field-input:focus {
    outline: none;
    border-color: #1b4b8f;
    background: #ffffff;
    box-shadow: 0 0 0 2px rgba(27, 75, 143, 0.15);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.25rem;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #1b4b8f, #0e7c86);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.25);
    transition: transform 0.1s ease, box-shadow 0.1s ease, filter 0.15s ease;
}

.btn-primary:hover {
    filter: brightness(1.05);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: 0 6px 12px rgba(15, 23, 42, 0.35);
}

.calculator-hint {
    margin-top: 0.75rem;
    margin-bottom: 0;
    font-size: 0.85rem;
    color: #6b7280;
}

/* Ergebnis-Karte */
.result-card h3 {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.result-main {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.result-sub {
    font-size: 0.9rem;
    color: #52606d;
}

/* Info & FAQ Sektionen */
.info-section {
    padding: 2.25rem 0 2.25rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.info-card {
    background: #ffffff;
    border-radius: 1rem;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.04);
    border-top: 3px solid #d4dde7;
}

.info-card ul {
    padding-left: 1.1rem;
}

.faq-section {
    padding: 0 0 2.5rem;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
}

.faq-item {
    background: #ffffff;
    border-radius: 0.9rem;
    padding: 1rem 1.25rem;
    border: 1px solid #e1e7f0;
}

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: 0.35rem;
}

.faq-item p {
    font-size: 0.9rem;
    color: #4b5563;
}

/* Footer */
.site-footer {
    border-top: 1px solid #d8e2f2;
    background: #ffffff;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
    font-size: 0.85rem;
    color: #6b7280;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.footer-links a {
    color: #4b5563;
}

.footer-links a:hover {
    color: #1b4b8f;
}

.footer-subline {
    margin: 0.1rem 0 0;
    font-size: 0.8rem;
}

/* Responsive Design */
@media (max-width: 920px) {
    .calculator-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .result-card {
        order: -1;
    }

    .info-grid,
    .faq-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .hero {
        padding-top: 1.75rem;
    }

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

    .footer-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}