/*
 * FFD – gemeinsames Lektionsschema
 * Datei: /assets/css/course-lesson.css
 *
 * Verbindlich für alle NEUEN Kurse ab 11.10.2026:
 *   .ffd-lesson
 *   .ffd-step
 *   .ffd-feedback
 *   <!-- FFD_PROGRESS_ACTION -->
 *
 * Kursbezogene Stylesheets dürfen Farben über die --ffd-course-* Variablen
 * ändern, aber keine eigene Navigations- oder Grundstruktur mehr erfinden.
 */

.ffd-lesson {
    --ffd-course-ink: #182d42;
    --ffd-course-muted: #6e6558;
    --ffd-course-accent: #a47b32;
    --ffd-course-accent-dark: #7f5e25;
    --ffd-course-border: #dfd2ba;
    --ffd-course-paper: #fffdf8;
    --ffd-course-soft: #f7f1e6;
    --ffd-course-success: #426b4b;
    --ffd-course-success-bg: #eaf3ec;
    --ffd-course-focus: #315e90;

    max-width: 880px;
    margin: 30px auto;
    padding: clamp(20px, 4vw, 40px);
    border: 1px solid var(--ffd-course-border);
    border-radius: 18px;
    background: var(--ffd-course-paper);
    color: var(--ffd-course-ink);
    font: 18px/1.68 Arial, sans-serif;
    text-align: left;
}

.ffd-lesson *,
.ffd-lesson *::before,
.ffd-lesson *::after {
    box-sizing: border-box;
}

.ffd-lesson > :first-child { margin-top: 0; }
.ffd-lesson > :last-child { margin-bottom: 0; }

.ffd-lesson p { margin: 14px 0; }
.ffd-lesson ul,
.ffd-lesson ol { padding-left: 26px; }
.ffd-lesson li { margin: 8px 0; }

.ffd-lesson h2,
.ffd-lesson h3 {
    color: var(--ffd-course-ink);
    font-family: Arial, sans-serif;
    line-height: 1.3;
}

.ffd-lesson h2 {
    margin: 22px 0 14px;
    font-size: clamp(24px, 4vw, 32px);
}

.ffd-lesson h3 {
    margin: 22px 0 10px;
    font-size: 21px;
}

/* Quellen-/Grundlagenboxen ohne eigene Klasse --------------------------- */
.ffd-lesson > details:not(.ffd-step):not(.ffd-feedback) {
    margin: 16px 0 22px;
    border: 1px solid var(--ffd-course-border);
    border-radius: 10px;
    background: #fff;
}

.ffd-lesson > details:not(.ffd-step):not(.ffd-feedback) > summary {
    padding: 14px 16px;
    color: var(--ffd-course-muted);
    font-weight: 700;
}

.ffd-lesson > details:not(.ffd-step):not(.ffd-feedback)[open] > summary {
    border-bottom: 1px solid var(--ffd-course-border);
}

.ffd-lesson > details:not(.ffd-step):not(.ffd-feedback) > :not(summary) {
    margin-left: 16px;
    margin-right: 16px;
}

/* Fünf Lernschritte ------------------------------------------------------ */
.ffd-step {
    margin: 14px 0;
    overflow: hidden;
    border: 1px solid var(--ffd-course-border);
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 3px 10px rgba(24,45,66,.035);
}

.ffd-step > summary {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 58px;
    padding: 15px 50px 15px 18px;
    cursor: pointer;
    color: var(--ffd-course-ink);
    font-weight: 700;
    line-height: 1.4;
    list-style: none;
}

.ffd-step > summary::-webkit-details-marker { display: none; }

.ffd-step > summary::after {
    content: '+';
    position: absolute;
    right: 18px;
    top: 50%;
    width: 26px;
    height: 26px;
    transform: translateY(-50%);
    display: grid;
    place-items: center;
    border: 1px solid var(--ffd-course-border);
    border-radius: 50%;
    color: var(--ffd-course-accent-dark);
    font-size: 20px;
    font-weight: 400;
    line-height: 1;
}

.ffd-step[open] {
    border-color: color-mix(in srgb, var(--ffd-course-accent) 55%, var(--ffd-course-border));
    box-shadow: 0 8px 22px rgba(24,45,66,.06);
}

.ffd-step[open] > summary {
    border-bottom: 1px solid var(--ffd-course-border);
    background: var(--ffd-course-soft);
    color: var(--ffd-course-accent-dark);
}

.ffd-step[open] > summary::after { content: '−'; }

.ffd-step > :not(summary) {
    margin-left: 18px;
    margin-right: 18px;
}

.ffd-step > :last-child { margin-bottom: 20px; }

.ffd-step summary:hover,
.ffd-feedback summary:hover {
    color: var(--ffd-course-accent-dark);
}

.ffd-step summary:focus-visible,
.ffd-feedback summary:focus-visible {
    outline: 3px solid var(--ffd-course-focus);
    outline-offset: -3px;
}

/* Rückmeldungen ---------------------------------------------------------- */
.ffd-feedback {
    margin: 18px 0 20px;
    overflow: hidden;
    border: 1px solid #d5ded7;
    border-left: 4px solid var(--ffd-course-success);
    border-radius: 9px;
    background: var(--ffd-course-success-bg);
}

.ffd-feedback > summary {
    padding: 13px 15px;
    cursor: pointer;
    color: #274b30;
    font-weight: 700;
}

.ffd-feedback > :not(summary) {
    margin-left: 16px;
    margin-right: 16px;
}

.ffd-feedback > :last-child { margin-bottom: 16px; }

/* Zitate ----------------------------------------------------------------- */
.ffd-lesson blockquote {
    margin: 24px 0;
    padding: 18px 22px;
    border-left: 4px solid var(--ffd-course-accent);
    background: var(--ffd-course-soft);
    color: var(--ffd-course-ink);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: clamp(20px, 3vw, 27px);
    font-style: italic;
    line-height: 1.45;
}

.ffd-lesson blockquote p {
    margin: 0;
    font: inherit;
}

.ffd-lesson strong { color: inherit; }

/* Abschluss-/Weiter-Aktion, durch lektion.php am Marker eingesetzt ------- */
.ffd-progress-inline {
    display: flex;
    justify-content: flex-end;
    margin: 30px 0 4px;
    padding-top: 22px;
    border-top: 1px solid var(--ffd-course-border);
}

.ffd-nav-button {
    min-height: 50px;
    padding: 13px 22px;
    border: 1px solid var(--ffd-course-ink);
    border-radius: 9px;
    background: var(--ffd-course-ink);
    color: #fff;
    cursor: pointer;
    font: 700 16px/1.35 Arial, sans-serif;
}

.ffd-nav-button:hover {
    background: #2f455c;
}

.ffd-complete-button {
    border-color: var(--ffd-course-accent-dark);
    background: var(--ffd-course-accent-dark);
}

.ffd-complete-button:hover {
    background: color-mix(in srgb, var(--ffd-course-accent-dark) 82%, #000);
}

.ffd-lesson a {
    color: #284f79;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

@media (max-width: 650px) {
    .ffd-lesson {
        margin: 14px auto;
        padding: 18px;
        font-size: 17px;
    }

    .ffd-step > summary {
        padding: 14px 46px 14px 14px;
        min-height: 54px;
    }

    .ffd-step > :not(summary),
    .ffd-feedback > :not(summary) {
        margin-left: 14px;
        margin-right: 14px;
    }

    .ffd-lesson blockquote {
        padding: 15px 17px;
        font-size: 21px;
    }

    .ffd-progress-inline,
    .ffd-progress-inline .ffd-nav-button {
        width: 100%;
    }

    .ffd-progress-inline .ffd-nav-button {
        text-align: center;
    }
}