/* Skip-Navigation */
    .skip-link {
        position: absolute;
        top: -100%;
        left: 0;
        background: #1a365d;
        color: #fff;
        padding: 0.75rem 1.5rem;
        z-index: 9999;
        font-size: 0.875rem;
        font-weight: 600;
        text-decoration: none;
        transition: top 0.2s ease;
    }
    .skip-link:focus {
        top: 0;
    }

    /* Focus-Styles */
    *:focus-visible {
        outline: 2px solid var(--color-primary, #1a365d);
        outline-offset: 2px;
    }

    /* Custom Properties - Navy Farbschema (optimiert fuer Kontrast) */
    :root {
        /* Fluid Typography Scale (320px - 1440px viewport) */
        /* Hero Title: 36px → 60px */
        --fluid-hero: clamp(2.25rem, 1.82rem + 2.14vw, 3.75rem);
        /* H1: 30px → 40px */
        --fluid-h1: clamp(1.875rem, 1.6rem + 1.34vw, 2.5rem);
        /* H2: 24px → 32px */
        --fluid-h2: clamp(1.5rem, 1.29rem + 1.07vw, 2rem);
        /* H3: 20px → 26px */
        --fluid-h3: clamp(1.25rem, 1.09rem + 0.8vw, 1.625rem);
        /* H4: 18px → 22px */
        --fluid-h4: clamp(1.125rem, 1.02rem + 0.54vw, 1.375rem);
        /* Lead/Intro: 18px → 24px */
        --fluid-lead: clamp(1.125rem, 0.96rem + 0.8vw, 1.5rem);
        /* Body: 16px → 18px */
        --fluid-body: clamp(1rem, 0.95rem + 0.27vw, 1.125rem);
        /* Small: 14px → 15px */
        --fluid-small: clamp(0.875rem, 0.85rem + 0.13vw, 0.9375rem);
        /* XS: 12px → 13px */
        --fluid-xs: clamp(0.75rem, 0.72rem + 0.13vw, 0.8125rem);

        /* Farben */
        --color-primary: #1a365d;
        --color-secondary: #2c5282;
        --color-tertiary: #3d7cb8;
        --color-accent: #1e4976;
        --color-text: #2d3748;
        --color-text-strong: #1a365d;
        --color-muted: #374151;
        --color-light: #e2e8f0;
        --color-lighter: #f7fafc;
        --color-white: #ffffff;
        --color-bg: #ffffff;
        --color-surface: #f7fafc;
        --color-border: #e2e8f0;
        --color-link: #2c5282;
        --color-link-hover: #1a365d;
        --color-blockquote-text: #374151;
        --color-blockquote-border: #2c5282;
        --color-badge-bg: #e2e8f0;
        --color-badge-text: #2c5282;
        --color-hero-text: #ffffff;
        --color-hero-muted: rgba(255, 255, 255, 0.85);
        --color-hero-subtle: rgba(255, 255, 255, 0.7);
    }

    .dark {
        --color-primary: #60a5fa;
        --color-secondary: #3b82f6;
        --color-tertiary: #93c5fd;
        --color-accent: #60a5fa;
        --color-text: #e2e8f0;
        --color-text-strong: #f8fafc;
        --color-muted: #94a3b8;
        --color-light: #334155;
        --color-lighter: #1e293b;
        --color-bg: #0f172a;
        --color-surface: #1e293b;
        --color-border: #334155;
        --color-link: #60a5fa;
        --color-link-hover: #93c5fd;
        --color-blockquote-text: #e2e8f0;
        --color-blockquote-border: #3b82f6;
        --color-badge-bg: #1e293b;
        --color-badge-text: #60a5fa;
        --color-hero-text: #ffffff;
        --color-hero-muted: rgba(255, 255, 255, 0.9);
        --color-hero-subtle: rgba(255, 255, 255, 0.75);
    }

    body {
        background-color: var(--color-bg);
        color: var(--color-text);
        font-size: var(--fluid-body);
        transition: background-color 0.3s ease, color 0.3s ease;
    }

    /* Fluid Typography Utility Classes */
    .fluid-hero { font-size: var(--fluid-hero); }
    .fluid-h1 { font-size: var(--fluid-h1); }
    .fluid-h2 { font-size: var(--fluid-h2); }
    .fluid-h3 { font-size: var(--fluid-h3); }
    .fluid-h4 { font-size: var(--fluid-h4); }
    .fluid-lead { font-size: var(--fluid-lead); }
    .fluid-body { font-size: var(--fluid-body); }
    .fluid-small { font-size: var(--fluid-small); }
    .fluid-xs { font-size: var(--fluid-xs); }

    /* Lesefortschritt-Anzeige */
    #progress-bar {
        position: fixed;
        top: 0;
        left: 0;
        width: 0%;
        height: 3px;
        background: linear-gradient(90deg, var(--color-secondary), var(--color-tertiary));
        z-index: 9999;
        transition: width 0.1s ease-out;
    }

    /* Series Card Styles */
    .series-card {
        display: block;
        background: var(--color-surface);
        border-radius: 1rem;
        overflow: hidden;
        transition: all 0.3s ease;
        border: 1px solid var(--color-border);
        text-decoration: none;
    }

    .series-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 20px 60px rgba(26, 54, 93, 0.15);
        border-color: var(--color-link);
    }

    .dark .series-card {
        background: var(--color-surface);
        border-color: var(--color-border);
    }

    .dark .series-card:hover {
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
        border-color: var(--color-link);
    }

    .series-card-title {
        color: var(--color-primary);
        font-weight: 700;
        transition: color 0.2s ease;
    }

    .series-card:hover .series-card-title {
        color: var(--color-link);
    }

    .series-card-description {
        color: var(--color-muted);
    }

    /* Stats Display */
    .stat-item {
        text-align: center;
    }

    .stat-number {
        font-size: 2.5rem;
        font-weight: 700;
        color: var(--color-primary);
        line-height: 1;
    }

    .dark .stat-number {
        color: var(--color-primary);
    }

    .stat-label {
        font-size: 0.875rem;
        color: var(--color-muted);
        margin-top: 0.25rem;
    }

    /* Dark Mode Toggle */
    .dark-toggle {
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: 9999px;
        padding: 0.5rem;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .dark-toggle:hover {
        background: var(--color-lighter);
        border-color: var(--color-link);
    }

    /* Badge/Tag Styles */
    .badge {
        display: inline-block;
        padding: 0.25rem 0.75rem;
        font-size: 0.75rem;
        font-weight: 600;
        border-radius: 9999px;
        background: var(--color-badge-bg);
        color: var(--color-badge-text);
    }

    .badge-large {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    /* Meta Text */
    .meta-text {
        color: var(--color-muted);
        font-size: 0.875rem;
    }

    /* Header Styles */
    .site-header {
        background: rgba(255, 255, 255, 0.9);
        border-bottom: 1px solid var(--color-border);
        backdrop-filter: blur(12px);
        position: sticky;
        top: 0;
        z-index: 100;
    }

    .dark .site-header {
        background: rgba(15, 23, 42, 0.9);
    }

    /* Logo Dark Mode Switching */
    #header-logo {
        display: block;
    }
    #header-logo-dark {
        display: none;
    }
    html.dark #header-logo {
        display: none;
    }
    html.dark #header-logo-dark {
        display: block;
    }

    .header-link {
        color: var(--color-muted);
        transition: color 0.2s ease;
    }

    .header-link:hover {
        color: var(--color-link);
    }

    /* Series Preview Image */
    .series-image {
        width: 100%;
        height: 200px;
        object-fit: cover;
        transition: transform 0.3s ease;
    }

    .series-card:hover .series-image {
        transform: scale(1.05);
    }

    /* Hero with subtle shadow */
    .hero-section {
        box-shadow: 0 4px 20px rgba(26, 54, 93, 0.15);
        position: relative;
        z-index: 10;
    }

    .dark .hero-section {
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

    /* Month Divider Styles */
    .month-divider {
        display: flex;
        align-items: center;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .month-divider::before,
    .month-divider::after {
        content: '';
        flex: 1;
        height: 1px;
        background: linear-gradient(90deg, transparent, var(--color-border) 20%, var(--color-border) 80%, transparent);
    }

    .month-label {
        font-size: 0.9375rem;
        font-weight: 600;
        letter-spacing: 0.05em;
        text-transform: uppercase;
        color: var(--color-muted);
        white-space: nowrap;
        padding: 0.5rem 0;
    }

    /* Month Section */
    .month-section {
        margin-bottom: 3rem;
    }

    .month-section:last-child {
        margin-bottom: 0;
    }

    /* Compact Series Card Styles */
    .series-card-compact {
        display: block;
        background: var(--color-surface);
        border-radius: 0.75rem;
        overflow: hidden;
        transition: all 0.25s ease;
        border: 1px solid var(--color-border);
        text-decoration: none;
        height: 100%;
    }

    .series-card-compact > a {
        display: flex;
        flex-direction: column;
        height: 100%;
    }

    .series-card-compact:hover {
        transform: translateY(-3px);
        box-shadow: 0 12px 40px rgba(26, 54, 93, 0.12);
        border-color: var(--color-link);
    }

    .dark .series-card-compact {
        background: var(--color-surface);
        border-color: var(--color-border);
    }

    .dark .series-card-compact:hover {
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
        border-color: var(--color-link);
    }

    .series-card-compact .series-image-compact {
        width: 100%;
        aspect-ratio: 1200 / 630;
        object-fit: cover;
        transition: transform 0.25s ease;
        flex-shrink: 0;
    }

    .series-card-compact:hover .series-image-compact {
        transform: scale(1.05);
    }

    .series-card-compact .card-content {
        padding: 1rem 1.25rem 1.25rem;
        display: flex;
        flex-direction: column;
        flex: 1;
    }

    .series-card-compact .card-badge-row {
        min-height: 1.5rem;
        margin-bottom: 0.5rem;
        flex-shrink: 0;
    }

    .series-card-compact .series-card-title {
        font-size: 1.125rem;
        line-height: 1.4;
        margin-bottom: 0.5rem;
        color: var(--color-primary);
        font-weight: 600;
        min-height: 3.15rem;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        flex-shrink: 0;
    }

    .series-card-compact:hover .series-card-title {
        color: var(--color-link);
    }

    .series-card-compact .series-card-description {
        font-size: 0.875rem;
        line-height: 1.5;
        color: var(--color-muted);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        margin-bottom: 0.75rem;
        min-height: 2.625rem;
        max-height: 2.625rem;
        flex-shrink: 0;
    }

    .series-card-compact .card-tags {
        min-height: 1.75rem;
        margin-bottom: 0.5rem;
        flex-shrink: 0;
    }

    .series-card-compact .badge-compact {
        display: inline-block;
        padding: 0.2rem 0.5rem;
        font-size: 0.6875rem;
        font-weight: 600;
        border-radius: 9999px;
        background: var(--color-badge-bg);
        color: var(--color-badge-text);
    }

    .series-card-compact .topic-tag-compact {
        display: inline-flex;
        align-items: center;
        gap: 0.25rem;
        padding: 0.25rem 0.5rem;
        font-size: 0.6875rem;
        border-radius: 0.375rem;
        background: var(--color-surface);
        color: var(--color-muted);
        border: 1px solid var(--color-border);
    }

    .series-card-compact .card-footer {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-top: 0.75rem;
        border-top: 1px solid var(--color-border);
        margin-top: auto;
        flex-shrink: 0;
    }

    .series-card-compact .read-more {
        display: inline-flex;
        align-items: center;
        gap: 0.375rem;
        font-size: 0.8125rem;
        font-weight: 500;
        color: var(--color-link);
        transition: gap 0.2s ease;
    }

    .series-card-compact:hover .read-more {
        gap: 0.5rem;
    }

    /* Compact Grid */
    .series-grid-compact {
        display: grid;
        grid-template-columns: repeat(1, 1fr);
        gap: 1.25rem;
    }

    @media (min-width: 640px) {
        .series-grid-compact {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (min-width: 1024px) {
        .series-grid-compact {
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
    }

    @media (min-width: 1280px) {
        .series-grid-compact {
            grid-template-columns: repeat(4, 1fr);
        }
    }

    /* Freshness Badges */
    .freshness-badge {
        display: inline-block;
        font-size: 0.6875rem;
        font-weight: 600;
        padding: 0.125rem 0.5rem;
        border-radius: 9999px;
        line-height: 1.4;
    }
    .freshness-new {
        background: #dcfce7;
        color: #166534;
    }
    .dark .freshness-new {
        background: rgba(22, 101, 52, 0.3);
        color: #86efac;
    }
    .freshness-stale {
        background: transparent;
        color: var(--color-muted);
        font-weight: 400;
        font-size: 0.6875rem;
        padding: 0;
    }

    /* Print Styles */
    @media print {
        #progress-bar,
        .dark-toggle,
        .site-header,
        .skip-link,
        #cookie-banner,
        nav,
        footer {
            display: none !important;
        }

        body {
            background: white !important;
            color: black !important;
        }

        * {
            box-shadow: none !important;
            text-shadow: none !important;
        }

        .hero-section {
            background: #1a365d !important;
            box-shadow: none !important;
        }

        .series-card,
        .series-card-compact {
            break-inside: avoid;
            box-shadow: none !important;
            border: 1px solid #ccc;
            transform: none !important;
        }

        .series-card-compact .series-image-compact {
            transform: none !important;
        }

        .card-animate {
            opacity: 1 !important;
            animation: none !important;
        }

        .month-divider::before,
        .month-divider::after {
            background: #ccc;
        }

        .series-grid-compact {
            grid-template-columns: repeat(2, 1fr);
        }

        a, a:visited {
            color: #1a365d !important;
        }

        h2, h3 {
            page-break-after: avoid;
        }
    }

    /* Staggered card entrance animation */
    @keyframes fadeSlideUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    .card-animate {
        opacity: 0;
        animation: fadeSlideUp 0.4s ease-out forwards;
    }
    .card-animate:nth-child(1) { animation-delay: 0ms; }
    .card-animate:nth-child(2) { animation-delay: 80ms; }
    .card-animate:nth-child(3) { animation-delay: 160ms; }
    .card-animate:nth-child(4) { animation-delay: 240ms; }
    .card-animate:nth-child(5) { animation-delay: 320ms; }
    .card-animate:nth-child(6) { animation-delay: 400ms; }

    @media (prefers-reduced-motion: reduce) {
        .card-animate {
            opacity: 1;
            animation: none;
        }
    }