/*
 * mod_showcase_timeline – Frontend Stylesheet
 * W3C-konform, barrierefrei (WCAG 2.1 AA)
 *
 * CSS Custom Properties (überschreibbar per Inline-Style vom Backend):
 *   --sctl-dot-color              Farbe des Zeitleisten-Kreises
 *   --sctl-line-color             Farbe der Verbindungslinie
 *   --sctl-date-color             Farbe der Datumsangabe
 *   --sctl-title-color            Farbe der Überschrift
 *   --sctl-card-bg                Hintergrundfarbe der Karte
 *   --sctl-card-border            Rahmenfarbe der Karte
 *   --sctl-button-bg              Button: Hintergrundfarbe
 *   --sctl-button-text            Button: Schriftfarbe
 *   --sctl-button-border          Button: Rahmenfarbe
 *   --sctl-button-bg-hover        Button Hover: Hintergrundfarbe
 *   --sctl-button-text-hover      Button Hover: Schriftfarbe
 *   --sctl-button-border-hover    Button Hover: Rahmenfarbe
 */

/* ============================================================
   1. CSS Custom Property Defaults
   ============================================================ */
.mod-showcase-timeline {
    --sctl-dot-color:      #0070c0;
    --sctl-line-color:     #c0c0c0;
    --sctl-date-color:     #555555;
    --sctl-title-color:    #222222;
    --sctl-card-bg:        #ffffff;
    --sctl-card-border:    #e0e0e0;

    /* Button (Normal) */
    --sctl-button-bg:      #0070c0;
    --sctl-button-text:    #ffffff;
    --sctl-button-border:  #0070c0;

    /* Button (Hover) */
    --sctl-button-bg-hover:     #005a9e;
    --sctl-button-text-hover:   #ffffff;
    --sctl-button-border-hover: #005a9e;

    /* Structural variables (not exposed to backend) */
    --sctl-dot-size:       1rem;
    --sctl-gap:            2rem;
    --sctl-text-color:     #333333;
    --sctl-radius:         0.5rem;
    --sctl-btn-radius:     0.375rem;
    --sctl-img-radius:     0.375rem;
    --sctl-focus-color:    var(--sctl-dot-color);

    color: var(--sctl-text-color);
    container-type: inline-size;
}

/* ============================================================
   2. Accessibility Utility
   ============================================================ */
.mod-showcase-timeline .sctl-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;
}

/* ============================================================
   3. Timeline List & Vertical Line
   ============================================================ */
.mod-showcase-timeline__list {
    list-style: none;
    margin: 0;
    padding: 0;
    position: relative;
}

/* Vertical connector line (decorative, aria-hidden via CSS only) */
.mod-showcase-timeline__list::before {
    content: "";
    position: absolute;
    top: 0.5rem;
    bottom: 0.5rem;
    left: calc(var(--sctl-dot-size) / 2 - 1px);
    width: 2px;
    background-color: var(--sctl-line-color);
    border-radius: 1px;
}

/* ============================================================
   4. List Item (mobile: single column)
   ============================================================ */
.mod-showcase-timeline__item {
    display: grid;
    grid-template-columns: var(--sctl-dot-size) 1fr;
    column-gap: var(--sctl-gap);
    margin-bottom: calc(var(--sctl-gap) * 1.5);
    position: relative;
}

/* ============================================================
   5. Dot / Marker
   ============================================================ */
.mod-showcase-timeline__marker {
    width: var(--sctl-dot-size);
    height: var(--sctl-dot-size);
    background-color: var(--sctl-dot-color);
    border-radius: 50%;
    margin-top: 0.3rem;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

/* ============================================================
   6. Article Card
   ============================================================ */
.mod-showcase-timeline__content {
    background-color: var(--sctl-card-bg);
    border: 1px solid var(--sctl-card-border);
    border-radius: var(--sctl-radius);
    padding: 1rem 1.25rem;
}

.mod-showcase-timeline__content:focus-visible {
    outline: 3px solid var(--sctl-focus-color);
    outline-offset: 2px;
}

/* ============================================================
   7. Header (Date + Title)
   ============================================================ */
.mod-showcase-timeline__header {
    margin-bottom: 0.75rem;
}

.mod-showcase-timeline__date {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--sctl-date-color);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.mod-showcase-timeline__title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0;
    color: var(--sctl-title-color);
    line-height: 1.4;
}

/* ============================================================
   8. Image
   ============================================================ */
.mod-showcase-timeline__figure {
    margin: 0.75rem 0 0;
}

.mod-showcase-timeline__image {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: var(--sctl-img-radius);
    object-fit: cover;
}

/* ============================================================
   9. Body Text
   ============================================================ */
.mod-showcase-timeline__text {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--sctl-text-color);
    margin-top: 0.75rem;
}

/* ============================================================
   10. Empty State
   ============================================================ */
.mod-showcase-timeline__empty {
    color: var(--sctl-date-color);
    font-style: italic;
}

/* ============================================================
   10b. Call-to-Action Button
   ============================================================ */
.mod-showcase-timeline__button-wrap {
    margin: 1rem 0 0;
}

.mod-showcase-timeline__button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    background-color: var(--sctl-button-bg);
    color: var(--sctl-button-text);
    border: 2px solid var(--sctl-button-border);
    border-radius: var(--sctl-btn-radius);
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease,
                border-color 0.15s ease, transform 0.1s ease;
    cursor: pointer;
}

.mod-showcase-timeline__button:hover {
    background-color: var(--sctl-button-bg-hover);
    color: var(--sctl-button-text-hover);
    border-color: var(--sctl-button-border-hover);
    text-decoration: underline;
}

.mod-showcase-timeline__button:focus-visible {
    outline: 3px solid var(--sctl-focus-color);
    outline-offset: 2px;
}

.mod-showcase-timeline__button:active {
    transform: translateY(1px);
}

/* ============================================================
   11. Reduced Motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    .mod-showcase-timeline *,
    .mod-showcase-timeline *::before,
    .mod-showcase-timeline *::after {
        transition-duration: 0.01ms !important;
        animation-duration:  0.01ms !important;
    }
}

/* ============================================================
   11. Dynamic Layout
   ============================================================ */

@supports (container-type: inline-size) {
@container (min-width: 48rem) {

    .mod-showcase-timeline__list::before {
        left: calc(50% - 1px);
    }

    .mod-showcase-timeline__item {
        grid-template-columns: 1fr var(--sctl-dot-size) 1fr;
        column-gap: calc(var(--sctl-gap) / 2);
        align-items: start;
    }

    /* Odd: content left, dot center, right column empty */
    .mod-showcase-timeline__item:nth-child(odd) .mod-showcase-timeline__content {
        grid-column: 1 / 2;
        grid-row: 1;
        text-align: right;
    }

    .mod-showcase-timeline__item:nth-child(odd) .mod-showcase-timeline__marker {
        grid-column: 2 / 3;
        grid-row: 1;
        justify-self: center;
    }

    /* Even: left column empty, dot center, content right */
    .mod-showcase-timeline__item:nth-child(even) .mod-showcase-timeline__marker {
        grid-column: 2 / 3;
        grid-row: 1;
        justify-self: center;
    }

    .mod-showcase-timeline__item:nth-child(even) .mod-showcase-timeline__content {
        grid-column: 3 / 4;
        grid-row: 1;
    }

    /* Right-align images for odd (left-side) cards */
    .mod-showcase-timeline__item:nth-child(odd) .mod-showcase-timeline__figure,
    .mod-showcase-timeline__item:nth-child(odd) .mod-showcase-timeline__image {
        margin-left: auto;
    }
}
}