/* ========================================
   BARRIEREFREIHEIT (WCAG 2.2 AA / BITV 2.0)
   ======================================== */

/* WCAG 2.4.1 - Skip Links (Bypass Blocks) */
.skip-links {
    position: absolute;
    top: -100px;
    left: 0;
    background: #000000;
    z-index: 10000;
    padding: 0;
    margin: 0;
    list-style: none;
}

.skip-links a {
    display: block;
    padding: 12px 20px;
    background: #0071e3;
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    border: 2px solid #ffffff;
}

.skip-links a:focus {
    position: absolute;
    top: 100px;
    left: 10px;
    outline: 3px solid #ffffff;
    outline-offset: 2px;
}

/* WCAG 2.4.7 - Focus Visible (enhanced) */
*:focus-visible {
    outline: 3px solid #0071e3;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Buttons mit besserer Fokus-Sichtbarkeit */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid #0071e3;
    outline-offset: 2px;
}

/* WCAG 1.4.11 - Non-text Contrast */
/* Sicherstellen, dass interaktive Elemente mind. 3:1 Kontrast haben */
.btn:focus-visible,
.cta-button:focus-visible {
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.5);
}

/* WCAG 2.1.1 - Keyboard Accessibility */
/* Versteckte Elemente nicht fokussierbar */
[hidden],
[aria-hidden="true"] {
    display: none !important;
}

/* WCAG 1.4.13 - Content on Hover or Focus */
/* Tooltips müssen persistent und dismissable sein */
[role="tooltip"] {
    position: absolute;
    z-index: 9999;
    background: #000000;
    color: #ffffff;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    pointer-events: none;
}

/* WCAG 2.5.5 - Target Size */
/* Mindestens 44x44px für Touch-Targets */
button,
a,
input[type="checkbox"],
input[type="radio"],
.clickable {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Links in Text: bessere Erkennbarkeit */
a:not([class]) {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 2px;
}

a:not([class]):hover {
    text-decoration-thickness: 3px;
}

/* WCAG 1.4.12 - Text Spacing */
/* Texte müssen bei erhöhtem Zeilenabstand lesbar bleiben */
* {
    line-height: 1.5 !important;
    letter-spacing: 0.12em;
    word-spacing: 0.16em;
}

/* Override nur für spezielle Bereiche wo Design wichtig ist */
.logo,
.hero-title,
h1, h2, h3 {
    letter-spacing: -0.022em !important;
}

/* WCAG 1.3.1 - Info and Relationships */
/* Visuell versteckte Texte für Screenreader */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* WCAG 2.3.1 - Three Flashes */
/* Reduzi

erte Bewegung für Nutzer mit vestibulären Störungen */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    video {
        animation: none !important;
    }
}

/* WCAG 1.4.3 - Contrast (Minimum) */
/* Stelle sicher, dass Text mind. 4.5:1 Kontrast hat */
/* Wird in HTML mit richtigen Farben umgesetzt */

/* Focus-Indikator für Video Controls */
video:focus-visible {
    outline: 3px solid #0071e3;
    outline-offset: 4px;
}

/* Verbesserte Tastaturbedienbarkeit für Custom Controls */
[role="button"]:focus-visible,
[role="link"]:focus-visible {
    outline: 3px solid #0071e3;
    outline-offset: 2px;
}

/* Loading States - WCAG 4.1.3 Status Messages */
[aria-live] {
    position: relative;
}

[aria-busy="true"]::after {
    content: "Wird geladen...";
    position: absolute;
    left: -9999px;
}

/* High Contrast Mode Support (Windows) */
@media (prefers-contrast: high) {
    * {
        border-color: currentColor !important;
    }

    button,
    a {
        border: 2px solid currentColor;
    }
}

/* Dark Mode unterstützen - WCAG 1.4.6 */
@media (prefers-color-scheme: dark) {
    /* Bereits umgesetzt in main design */
}

/* BITV 2.0 spezifisch: Seitentitel muss beschreibend sein */
/* Wird in HTML <title> umgesetzt */

/* Formulare - WCAG 3.3.2 Labels or Instructions */
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input:required,
textarea:required,
select:required {
    border-left: 4px solid #0071e3;
}

input:invalid,
textarea:invalid,
select:invalid {
    border-left: 4px solid #ff3b30;
}

/* Fehlermeldungen */
.error-message {
    color: #ff3b30;
    font-size: 14px;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.error-message::before {
    content: "⚠";
    font-size: 16px;
}

/* Erfolgsm eldungen */
.success-message {
    color: #30d158;
    font-size: 14px;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.success-message::before {
    content: "✓";
    font-size: 16px;
}

/* WCAG 3.2.3 & 3.2.4 - Consistent Navigation & Identification */
/* Navigation muss konsistent bleiben */
nav {
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Print Styles - WCAG Success Criterion (allgemein) */
@media print {
    .skip-links,
    .video-background,
    nav,
    .cta-button {
        display: none;
    }

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