/* Apple-inspiriertes, minimalistisches Design mit Barrierefreiheit */

:root {
    --color-primary: #007AFF;
    --color-primary-hover: #0051D5;
    --color-text: #1D1D1F;
    --color-text-secondary: #86868B;
    --color-background: #FFFFFF;
    --color-background-secondary: #F5F5F7;
    --color-border: #D2D2D7;
    --color-link: #007AFF;
    --color-link-hover: #0051D5;
    --spacing-unit: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-size-base: 17px;
    --line-height-base: 1.47059;
    --max-width: 980px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #F5F5F7;
        --color-text-secondary: #86868B;
        --color-background: #000000;
        --color-background-secondary: #1D1D1F;
        --color-border: #424245;
    }
}

/* Reset und Basis-Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navigation {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background-color: rgba(255, 255, 255, 0.72);
}

@media (prefers-color-scheme: dark) {
    .navigation {
        background-color: rgba(0, 0, 0, 0.72);
    }
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
}

.logo {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.011em;
    color: var(--color-text);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: calc(var(--spacing-unit) * 3);
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 17px;
    font-weight: 400;
    padding: calc(var(--spacing-unit) * 1) 0;
    position: relative;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-text);
    outline: none;
}

.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.nav-link:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: 4px;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 6) calc(var(--spacing-unit) * 3);
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

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

.content-section h2 {
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -0.022em;
    margin-bottom: calc(var(--spacing-unit) * 2);
    line-height: 1.08349;
}

.content-section h3 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.011em;
    margin-top: calc(var(--spacing-unit) * 6);
    margin-bottom: calc(var(--spacing-unit) * 2);
    line-height: 1.14286;
}

.content-section h4 {
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.011em;
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 1);
    line-height: 1.19048;
}

.stand-date {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.section-block {
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.section-block p {
    margin-bottom: calc(var(--spacing-unit) * 2);
    line-height: 1.47059;
}

.section-block ul,
.section-block ol {
    margin-left: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 2);
    padding-left: calc(var(--spacing-unit) * 2);
}

.section-block li {
    margin-bottom: calc(var(--spacing-unit) * 1);
    line-height: 1.47059;
}

.section-block address {
    font-style: normal;
    line-height: 1.47059;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

/* Links */
a {
    color: var(--color-link);
    text-decoration: none;
    transition: var(--transition);
}

a:hover,
a:focus {
    color: var(--color-link-hover);
    text-decoration: underline;
    outline: none;
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Notes */
.note {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 2);
    background-color: var(--color-background-secondary);
    border-radius: 8px;
    border-left: 3px solid var(--color-primary);
}

/* Footer */
.footer {
    background-color: var(--color-background-secondary);
    border-top: 1px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 3);
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 8);
}

.footer p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-base: 16px;
    }

    .nav-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        width: 100%;
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 1);
    }

    .content-section h2 {
        font-size: 32px;
    }

    .content-section h3 {
        font-size: 24px;
    }

    .content-section h4 {
        font-size: 19px;
    }

    .main-content {
        padding: calc(var(--spacing-unit) * 4) calc(var(--spacing-unit) * 2);
    }
}

/* Barrierefreiheit: Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* Print Styles */
@media print {
    .navigation,
    .footer {
        display: none;
    }

    .content-section {
        display: block !important;
    }

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

    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: var(--color-text-secondary);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-text-secondary: #000000;
    }

    @media (prefers-color-scheme: dark) {
        :root {
            --color-border: #FFFFFF;
            --color-text-secondary: #FFFFFF;
        }
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}