:root {
        --white: #fff;
        --black: #000;

        --btn-bg: var(--black);
        --btn-color: var(--white);

        --color-bg: var(--white);
        --color-fg: var(--black);
        --color-border: transparent;
        --color-shadow: rgba(0, 0, 0, 0.1);
        --color-primary: var(--black);
        --color-secondary: var(--black);
        --color-secondary-text: var(--white);
        --color-link: inherit;
        --focus-outline: var(--color-fg);
        --radius: 12px;
        --radius-sm: 8px;
        --space-1: 0rem;
        --space-2: 1rem;
        --space-3: 1rem;
        --space-4: 1rem;
        --font-sans: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, sans-serif;
        --shadow-sm: 0 1px 3px var(--color-shadow);
        --shadow-md: 0 4px 6px var(--color-shadow);
        --shadow-lg: 0 10px 25px var(--color-shadow);
        --z-chat-form: 5;
        --z-chat-header: 10;

        /* Barrierefreiheit: Schriftgrößen */
        --font-size-klein: 14px;
        --font-size-mittel: 16px;
        --font-size-gross: 20px;
        --chat-font-size: var(--font-size-mittel);

        --gradient-start: var(--white);
        --gradient-text: var(--black);
        --gradient-text-shadow: var(--text-outline-white);

        /* --text-outline-black: 1px 1px 0 var(--black), -1px 1px 0 var(--black), 1px -1px 0 var(--black), -1px -1px 0 var(--black);
        --text-outline-white: 1px 1px 0 var(--white), -1px 1px 0 var(--white), 1px -1px 0 var(--white), -1px -1px 0 var(--white); */
        
        --global-text-shadow: var(--text-outline-white);
        --btn-text-shadow: var(--text-outline-black);

        --duration-fast: 0.15s;
        --duration-normal: 0.2s;
        --duration-slide: 0.3s;
        --transform-hover-sm: translateY(-1px);
        --transform-hover-md: translateY(-2px);
        --anim-slide: slideIn var(--duration-slide) ease-out;
        --anim-spin: spin 0.8s linear infinite;
        --anim-bounce: bounce 1s ease-in-out infinite;

        color-scheme: light dark;
}

/* "Security-Check" */
.security-check {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    height: 0;
    width: 0;
    z-index: -1;
    pointer-events: none;
}

.error-message {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 100px auto;
    padding: 20px;
    text-align: center;
}

.error-message code {
    background: var(--white);
    padding: 10px;
    display: block;
    margin: 20px 0;
}

.error-message ul {
    list-style: none;
    padding: 0;
}

:where(.chat, .chat *) { box-sizing: border-box; }

body {
    margin: 0;
    padding: 1.5rem 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    background: var(--color-bg);
    color: var(--color-fg);
    font-family: var(--font-sans);
    box-sizing: border-box;
    text-shadow: var(--global-text-shadow);
}

.chat {
    --chat-bg: var(--white);
    --message-bot-bg: var(--white);
    --consent-bg: var(--white);
    --input-focus-shadow: 0 0 0 3px var(--black);

    position: relative;
    background: var(--chat-bg);
    color: var(--color-fg);
    width: 100%;
    height: 100%;
    max-width: 720px;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    container-type: inline-size;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

@supports (width: 1cqw) {
    .chat {
        --space-1: clamp(0rem, 1cqw, 0.5rem);
        --space-2: clamp(0.5rem, 2cqw, 1rem);
        --space-3: clamp(0.75rem, 3cqw, 1.5rem);
        --space-4: clamp(1rem, 4cqw, 2rem);
    }
    .chat__messages,
    .chat__list {
        gap: clamp(0.5rem, 2cqw, 1.5rem);
    }
}

.chat__header {
    padding: 1.25em 1.5em;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--color-primary) 100%);
    color: var(--gradient-text);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-chat-header);
    text-shadow: var(--gradient-text-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 0 0 auto;
}
.chat__title {
    font-weight: 600;
    margin: 0;
    font-size: 1.25rem;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.chat__title-emoji {
    font-size: 1.5rem;
    line-height: 1;
    display: inline-block;
}

.chat__consent {
    padding: 2em;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow-y: auto;
    flex: 1 1 auto;
    min-height: 0;
}
.chat__consent[hidden] {
    display: none;
}
.chat__subtitle {
    margin: 0 0 var(--space-2);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-fg);
}
.chat__text {
    margin: 0 0 var(--space-2);
    line-height: 1.6;
    color: var(--black);
}
.chat__consent-form {
    display: grid;
    gap: var(--space-2);
    width: 100%;
    max-width: 500px;
}
.chat__field { display: grid; gap: 0.25rem; align-content: start; position: relative; } 
.chat__checkbox { inline-size: 1rem; block-size: 1rem; }
.chat__label { font-size: 0.95rem; }

.chat__button,
.chat__send,
.chat__button--consent {
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-fg);
    cursor: pointer;
}

.chat__button, .chat__send {
    padding: 0.75em 1.25em;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease, background-color var(--duration-normal) ease;
}

.chat__button:hover,
.chat__send:hover {
    transform: var(--transform-hover-sm);
    box-shadow: var(--shadow-md);
}
.chat__button:active,
.chat__send:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.chat__button--consent {
    display: block;
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 1.05rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    transition: transform var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}

.chat__button--consent:hover {
    transform: var(--transform-hover-md);
    box-shadow: var(--shadow-md);
}

.chat__button--consent:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.chat__button--consent:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

.chat__button--consent:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

.chat__button--consent:disabled:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
}

.chat__field--consent {
    margin-block: var(--space-2);
}

.chat__label--consent {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    line-height: 1.4;
}

.chat__messages {
    padding: 1em 1.5em;
    overflow: hidden auto;
    display: grid;
    gap: var(--space-2);
    align-content: start;
    flex: 1 1 auto;
    min-height: 0;
}
.chat__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--space-2);
}

.chat__message {
    line-height: 1.5;
    display: grid;
    gap: 0.5rem;
    align-content: center;
    animation: var(--anim-slide);
}
.chat__message-article {
    max-width: 75ch;
}
.chat__message--user {
    padding-left: 10%;
}
.chat__message--user .chat__message-article {
    color: var(--color-fg);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    margin-top: auto;
    justify-self: end;
    box-shadow: var(--shadow-md);
}
.chat__message--bot {
    padding-right: 10%;
}
.chat__message--bot .chat__message-article {
    color: var(--color-fg);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    justify-self: start;
    box-shadow: var(--shadow-sm);
}
.chat__message--user .chat__message-meta {
    justify-self: end;
}
.chat__message--bot .chat__message-meta {
    justify-self: start;
}
.chat__message-meta {
    display: flex;
    gap: var(--space-1);
    align-items: center;
    font-size: 0.8rem;
    padding: 0 0.25rem;
}
.chat__bot-emoji {
    font-size: 1.2rem;
    line-height: 1;
    display: inline-block;
}
.chat__time {
    font-variant-numeric: tabular-nums;
}
.chat__message-content {
    white-space: pre-wrap;
    padding: 0;
    line-height: 1.6;
}

/* Markdown HTML Elements - Backend generates these */
.chat__message-content h1,
.chat__message-content h2,
.chat__message-content h3 {
    margin: 0.75em 0 0.5em;
    font-weight: 600;
    line-height: 1.3;
    color: inherit;
}

.chat__message-content h1:first-child,
.chat__message-content h2:first-child,
.chat__message-content h3:first-child {
    margin-top: 0;
}

.chat__message-content h1 { font-size: 1.5em; }
.chat__message-content h2 { font-size: 1.3em; }
.chat__message-content h3 { font-size: 1.15em; }

.chat__message-content ul,
.chat__message-content ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.chat__message-content li {
    margin: 0.25em 0;
    line-height: 1.5;
}

.chat__message-content ul {
    list-style-type: disc;
}

.chat__message-content ol {
    list-style-type: decimal;
}

.chat__message-content code {
    background: rgba(0, 0, 0, 0.05);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

.chat__message-content pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 0.75em 1em;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 0.75em 0;
}

.chat__message-content pre code {
    background: none;
    padding: 0;
    font-size: 0.85em;
}

.chat__message-content blockquote {
    margin: 0.75em 0;
    padding: 0.5em 0 0.5em 1em;
    border-left: 3px solid var(--color-primary);
    font-style: italic;
    color: inherit;
    opacity: 0.9;
}

.chat__message-content hr {
    margin: 1em 0;
    border: none;
    border-top: 2px solid var(--color-border);
}

.chat__message-content strong {
    font-weight: 600;
}

.chat__message-content em {
    font-style: italic;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    .chat__message-content code {
        background: rgba(255, 255, 255, 0.1);
    }

    .chat__message-content pre {
        background: rgba(255, 255, 255, 0.1);
    }
}

/* High Contrast Mode */
.high-contrast .chat__message-content code,
.high-contrast .chat__message-content pre {
    border: 2px solid var(--color-border);
}

.high-contrast .chat__message-content blockquote {
    border-left-width: 4px;
}

.chat__sources {
    font-size: 0.9em;
    margin: 0.75rem 0 0 0;
    padding: 0;
}
.chat__details {
    border-radius: var(--radius-sm);
}
.chat__summary {
    cursor: pointer;
    padding: 0.25rem 0;
    font-weight: 500;
}
.chat__list--sources {
    margin: 0.5rem 0 0 0;
    padding-left: 1.25rem;
}
.chat__link {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 0.15em;
    word-break: break-word;
    transition: opacity 0.2s ease;
}
.chat__link:hover {
    opacity: 1;
    text-decoration: none;
}

.chat__form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-2);
    padding: 1em 1.5em;
    background: var(--chat-bg);
    border-top: 2px solid var(--color-border);
    position: sticky;
    bottom: 0;
    z-index: var(--z-chat-form);
    flex: 0 0 auto;
}
.chat__form[hidden] {
    display: none;
}
.chat__field--actions {
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
}
.chat__input {
    padding: 0.75em 1em;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--chat-bg);
    color: inherit;
    min-width: 0;
    font-size: 0.95rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease;
}
.chat__input:focus,
.chat__input:focus-visible {
    box-shadow: var(--input-focus-shadow);
    outline: none;
}

.chat__input.is-loading {
    color: transparent;
    caret-color: transparent;
}

.input-loader {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

.chat__footer {
    padding: 0.75em 1.5em;
    display: grid;
    place-content: center;
    background: var(--chat-bg);
    flex: 0 0 auto;
}
.chat__nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0;
    font-size: 0.85rem;
    justify-content: center;
}
.chat__nav .chat__link:not(:last-child)::after {
    content: "|";
    margin-left: 0.5rem;
    opacity: 1;
    text-decoration: none;
}
.chat__disclaimer {
    font-size: 0.75rem;
    margin: 0;
    padding: 0.5em 1.5em;
    line-height: 1.4;
    font-style: italic;
    text-align: center;
    background: var(--chat-bg);
    flex: 0 0 auto;
}

.chat :focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

.chat__checkbox {
    accent-color: var(--color-primary);
}

.chat__field--tracking {
    margin-block: var(--space-2);
}

.chat__label--tracking {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    line-height: 1.4;
}

@media (prefers-contrast: more), (prefers-contrast: high) {
    .chat { border: 2px solid currentColor; }
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: var(--black);
        --color-fg: var(--white);
        --color-border: transparent;
        --color-shadow: rgba(0, 0, 0, 0.3);
        --btn-bg: var(--white);
        --btn-color: var(--black);

        --global-text-shadow: var(--text-outline-black);
        --btn-text-shadow: var(--text-outline-black);

        --gradient-start: var(--black);
        --gradient-text: var(--white);
        --gradient-text-shadow: var(--text-outline-black);
    }

    .chat {
        --chat-bg: var(--black);
        --message-bot-bg: var(--black);
        --consent-bg: var(--black);
        --input-focus-shadow: 0 0 0 3px var(--white);
        border: 2px solid #333;
    }

    .chat__input {
        background: var(--black);
    }

    .chat__text {
        color: var(--white);
    }
}

@media (prefers-reduced-motion: reduce) {
    :root {
        --duration-fast: 0s;
        --duration-normal: 0s;
        --duration-slide: 0s;
        --transform-hover-sm: none;
        --transform-hover-md: none;
        --anim-slide: none;
        --anim-spin: none;
        --anim-bounce: none;
    }
    
    html {
        scroll-behavior: auto;
    }
}

@supports (width: clamp(10px, 5vw, 100px)) {
    .chat { width: clamp(280px, 90vw, 720px); }
}
@container (min-width: 420px) {
    .chat__messages { gap: var(--space-3); }
}

@media (max-width: 480px) {
    body {
        padding: 0;
    }
    .chat {
        border-radius: 0;
        box-shadow: none;
        border: none;
        max-width: 100%;
    }
    .chat__consent {
        padding: 1.5em 1em;
    }
    .chat__footer {
        padding: 0.5em 1em;
    }
    .chat__messages {
        padding: 0.75em 1em;
    }
    .chat__message--user {
        padding-left: 5%;
    }
    .chat__message--bot {
        padding-right: 5%;
    }
}

.loader-circle {
    display: inline-block;
    width: 1.1rem;
    height: 1.1rem;
    border: 3px solid var(--color-primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: var(--anim-spin);
    vertical-align: middle;
}

.loader-dots {
    display: inline-flex;
    gap: 0.35rem;
    vertical-align: middle;
}

.loader-dots span {
    width: 0.45rem;
    height: 0.45rem;
    background: currentColor;
    border-radius: 50%;
    animation: var(--anim-bounce);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.4); opacity: 1; }
    40% { transform: scale(1); opacity: 1; }
}

.chat__field:focus-within {
    outline: none;
}

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

/* =====================================================
   FEEDBACK SYSTEM
   ===================================================== */

/* Feedback Button */
.feedback-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.75em 1em;
    background: transparent;
    color: var(--color-fg);
    border: 4px solid var(--color-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
    white-space: nowrap;
}

.feedback-btn:hover {
    transform: var(--transform-hover-sm);
    box-shadow: var(--shadow-md);
}

.feedback-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.feedback-btn:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

.feedback-btn:disabled,
.feedback-btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.feedback-btn__icon {
    font-size: 1.1rem;
}

.feedback-btn[hidden] {
    display: none;
}

/* Feedback Dialog - covers entire chat area */
.feedback-dialog {
    position: absolute;
    inset: 0;
    margin: 0;
    padding: 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: var(--color-bg);
    color: var(--color-fg);
    width: 100%;
    height: 100%;
    max-width: none;
    max-height: none;
}

.feedback-dialog[open] {
    display: flex;
    align-items: center;
    justify-content: center;
}

.feedback-dialog::backdrop {
    background: transparent;
}

.feedback-dialog__form {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feedback-dialog__title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.feedback-dialog__description {
    margin: 0;
    font-size: 0.95rem;
    opacity: 0.8;
}

/* Star Rating */
.feedback-dialog__stars {
    border: none;
    padding: 0;
    margin: 0.5rem 0;
    display: flex;
    gap: 0.25rem;
}

.feedback-dialog__radio {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.feedback-dialog__star {
    cursor: pointer;
    font-size: 2rem;
    color: #ccc;
    transition: color var(--duration-fast) ease;
    line-height: 1;
}

/* Selected state - applied via JavaScript */
.feedback-dialog__star.selected {
    color: gold;
}

.feedback-dialog__radio:focus-visible + .feedback-dialog__star {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* Comment Textarea */
.feedback-dialog__comment-wrap {
    margin-top: 0.5rem;
}

.feedback-dialog__comment-wrap[hidden] {
    display: none;
}

.feedback-dialog__comment {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-fg);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    min-height: 80px;
}

.feedback-dialog__comment:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

/* Action Buttons */
.feedback-dialog__actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    margin-top: 0.5rem;
}

.feedback-dialog__cancel,
.feedback-dialog__submit {
    padding: 0.6rem 1.25rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.feedback-dialog__cancel {
    background: transparent;
    color: var(--color-fg);
}

.feedback-dialog__cancel:hover {
    background: rgba(0, 0, 0, 0.05);
}

.feedback-dialog__submit {
    background: var(--color-secondary);
    color: var(--color-secondary-text);
    box-shadow: var(--shadow-sm);
}

.feedback-dialog__submit:hover {
    transform: var(--transform-hover-sm);
    box-shadow: var(--shadow-md);
}

.feedback-dialog__submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Inactivity Prompt */
.feedback-prompt__buttons {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.feedback-prompt__btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.feedback-prompt__btn--yes {
    background: var(--color-secondary);
    color: var(--color-secondary-text);
    box-shadow: var(--shadow-sm);
}

.feedback-prompt__btn--yes:hover {
    transform: var(--transform-hover-sm);
    box-shadow: var(--shadow-md);
}

.feedback-prompt__btn--no {
    background: transparent;
    color: var(--color-fg);
}

.feedback-prompt__btn--no:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Visually Hidden (for accessibility) */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Dark Mode Adjustments for Feedback */
@media (prefers-color-scheme: dark) {
    .feedback-dialog {
        background: var(--black);
        border-color: var(--white);
    }

    .feedback-dialog__comment {
        background: var(--black);
        border-color: var(--white);
    }

    .feedback-dialog__comment:focus {
        box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
    }

    .feedback-dialog__star {
        color: #555;
    }

    .feedback-dialog__cancel:hover,
    .feedback-prompt__btn--no:hover {
        background: rgba(255, 255, 255, 0.1);
    }
}

/* Mobile Adjustments for Feedback */
@media (max-width: 480px) {
    .feedback-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .feedback-btn__label {
        display: none;
    }

    .feedback-dialog {
        width: 95vw;
        max-width: none;
    }

    .feedback-dialog__form {
        padding: 1rem;
    }

    .feedback-dialog__star {
        font-size: 1.75rem;
    }

    .feedback-dialog__actions {
        flex-direction: column;
    }

    .feedback-dialog__cancel,
    .feedback-dialog__submit {
        width: 100%;
        text-align: center;
    }
}

/* ===================================================================================================
   BARRIEREFREIHEIT / ACCESSIBILITY
   =================================================================================================== */

/* Schriftgröße anwenden */
.chat {
    font-size: var(--chat-font-size);
}

/* A11y Toggle Button im Header */
.chat__a11y-toggle {
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.25em;
    cursor: pointer;
    font-size: 1.5rem;
    color: inherit;
    transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
    line-height: 1;
}

.chat__a11y-toggle:hover {
    transform: var(--transform-hover-sm);
}

.chat__a11y-toggle:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* A11y Panel */
.chat__a11y-panel {
    display: flex;
    gap: 1.5rem;
    padding: 0.75em 1.5em;
    background: var(--chat-bg, var(--white));
    flex-wrap: wrap;
    align-items: center;
    flex: 0 0 auto;
}

.chat__a11y-panel[hidden] {
    display: none;
}

.chat__a11y-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat__a11y-label {
    font-size: 0.9rem;
    font-weight: 500;
}

.chat__a11y-buttons {
    display: flex;
    gap: 0.25rem;
}

.chat__a11y-btn {
    padding: 0.3em 0.6em;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: inherit;
    transition: background-color var(--duration-fast) ease;
}

.chat__a11y-btn:hover {
    background: var(--color-border);
    color: var(--color-bg);
}

.chat__a11y-btn[aria-pressed="true"] {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.chat__a11y-checkbox {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* Visually Hidden (für Screen Reader) */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===================================================================================================
   SPRACHAUSWAHL / LANGUAGE SELECTOR
   =================================================================================================== */

/* Header Actions Container */
.chat__header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* Lang Toggle Button */
.chat__lang-toggle {
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0.25em;
    cursor: pointer;
    font-size: 1.5rem;
    color: inherit;
    transition: transform var(--duration-fast) ease;
    line-height: 1;
}

.chat__lang-toggle:hover {
    transform: var(--transform-hover-sm);
}

.chat__lang-toggle:focus-visible {
    outline: 3px solid var(--focus-outline);
    outline-offset: 2px;
}

/* Lang Panel */
.chat__lang-panel {
    display: flex;
    gap: 0.5rem;
    padding: 0.75em 1.5em;
    background: var(--chat-bg, var(--white));
    flex-wrap: wrap;
    justify-content: center;
    flex: 0 0 auto;
}

.chat__lang-panel[hidden] {
    display: none;
}

/* Lang Buttons */
.chat__lang-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5em;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: var(--radius-sm);
    min-width: 60px;
    color: inherit;
    transition: background-color var(--duration-fast) ease;
}

.chat__lang-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.chat__lang-btn[aria-pressed="true"] {
    background: var(--color-primary);
    color: var(--color-bg);
}

.chat__lang-flag {
    font-size: 1.5rem;
    line-height: 1;
}

.chat__lang-name {
    font-size: 0.7rem;
    font-weight: 500;
}

/* ===================================================================================================
   HIGH CONTRAST MODE (WCAG AAA)
   Unabhängig von Dark Mode - funktioniert in beiden
   =================================================================================================== */

/* High Contrast: Light Theme Basis */
.high-contrast {
    --color-bg: #fff !important;
    --color-fg: #000 !important;
    --chat-bg: #fff !important;
    --color-primary: #000 !important;
    --color-secondary: #000 !important;
    --color-border: #000 !important;
    --color-shadow: #000 !important;
    --color-link: #0000EE !important;
    --shadow-sm: none !important;
    --shadow-md: none !important;
    --shadow-lg: none !important;
}

/* High Contrast + Dark Mode (System oder manuell) */
@media (prefers-color-scheme: dark) {
    .high-contrast {
        --color-bg: #000 !important;
        --color-fg: #fff !important;
        --chat-bg: #000 !important;
        --color-primary: #fff !important;
        --color-secondary: #fff !important;
        --color-border: #fff !important;
        --color-shadow: #fff !important;
        --color-link: #ffff00 !important;
    }
}

/* Verstärkte visuelle Elemente - explizite Borders */
.high-contrast .chat {
    border: 3px solid var(--color-border) !important;
}

.high-contrast .chat__header {
    border-bottom: 3px solid var(--color-border) !important;
}

.high-contrast .chat__a11y-panel,
.high-contrast .chat__lang-panel {
    border-bottom: 3px solid var(--color-border) !important;
}

.high-contrast .chat__message--bot .chat__message-article {
    border-left: 4px solid var(--color-border) !important;
}

.high-contrast .chat__message--user .chat__message-article {
    border: 3px solid var(--color-border) !important;
}

.high-contrast .chat__form {
    border-top: 3px solid var(--color-border) !important;
}

.high-contrast .chat__input {
    border: 3px solid var(--color-border) !important;
}

.high-contrast .chat__disclaimer {
    border-top: 3px solid var(--color-border) !important;
}

.high-contrast .chat__footer {
    border-top: 3px solid var(--color-border) !important;
}

.high-contrast .chat__link {
    color: var(--color-link) !important;
    text-decoration: underline !important;
    text-decoration-thickness: 2px !important;
    text-underline-offset: 0.2em !important;
}

.high-contrast :focus-visible {
    outline-width: 4px !important;
    outline-offset: 3px !important;
}

.high-contrast .chat__a11y-btn,
.high-contrast .chat__a11y-toggle,
.high-contrast .chat__lang-btn,
.high-contrast .chat__lang-toggle,
.high-contrast .chat__button,
.high-contrast .chat__send,
.high-contrast .chat__button--consent {
    border: 3px solid var(--color-border) !important;
}