/* Styling for the "What You Can Adjust and Explore" / FAQ block that sits below
   each mechanism simulator.

   Every simulator stylesheet opens with `* { margin: 0; padding: 0; }`, which
   strips the default spacing from headings, paragraphs and lists. That reset is
   right for the simulator chrome and wrong for a block of prose, so this file
   puts the spacing back for `.sim-about` only, and gives the FAQ entries a card
   treatment instead of the browser's bare <details> marker.

   Colours come from the variables each simulator page already defines, so the
   block follows the light and dark themes without any extra rules. */

.sim-about {
    max-width: 62rem;
    margin: 3rem auto 1.5rem;
    padding: 0 1.25rem;
    color: var(--sl-color-text, #1F2937);
    font-family: var(--sl-font, system-ui, sans-serif);
    line-height: 1.65;
    font-size: 1rem;
}

.sim-about h2 {
    font-size: 1.5rem;
    line-height: 1.3;
    font-weight: 700;
    margin: 0 0 0.75rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--sl-color-accent, #2A9D8F);
    color: var(--sl-color-text, #1F2937);
}

.sim-about h3 {
    font-size: 1.125rem;
    line-height: 1.35;
    font-weight: 650;
    margin: 1.75rem 0 0.6rem;
    color: var(--sl-color-accent, #2A9D8F);
}

.sim-about p {
    margin: 0 0 1rem;
}

.sim-about ul {
    margin: 0 0 1rem;
    padding-left: 1.35rem;
    list-style: disc;
}

.sim-about li {
    margin: 0 0 0.45rem;
    padding-left: 0.2rem;
}

.sim-about li::marker {
    color: var(--sl-color-accent, #2A9D8F);
}

.sim-about strong {
    font-weight: 650;
    color: var(--sl-color-text, #1F2937);
}

/* ---- FAQ entries as cards ------------------------------------------------ */

.sim-about details {
    margin: 0 0 0.6rem;
    border: 1px solid var(--sl-color-hairline, #e2e8f0);
    border-radius: 8px;
    background: var(--sl-color-gray-1, #f9fafb);
    overflow: hidden;
}

.sim-about details[open] {
    border-color: var(--sl-color-accent, #2A9D8F);
}

.sim-about summary {
    cursor: pointer;
    padding: 0.8rem 2.6rem 0.8rem 1rem;
    font-weight: 600;
    position: relative;
    list-style: none;
    /* a summary is a heading in practice, so give it a comfortable tap target */
    min-height: 2.75rem;
    display: flex;
    align-items: center;
}

.sim-about summary::-webkit-details-marker {
    display: none;
}

.sim-about summary::after {
    content: "";
    position: absolute;
    right: 1rem;
    top: 50%;
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid var(--sl-color-accent, #2A9D8F);
    border-bottom: 2px solid var(--sl-color-accent, #2A9D8F);
    transform: translateY(-70%) rotate(45deg);
    transition: transform 0.18s ease;
}

.sim-about details[open] > summary::after {
    transform: translateY(-30%) rotate(-135deg);
}

.sim-about summary:hover {
    color: var(--sl-color-accent, #2A9D8F);
}

.sim-about summary:focus-visible {
    outline: 2px solid var(--sl-color-accent, #2A9D8F);
    outline-offset: -2px;
}

.sim-about details > p {
    margin: 0;
    padding: 0 1rem 0.9rem;
    border-top: 1px solid var(--sl-color-hairline, #e2e8f0);
    padding-top: 0.8rem;
}

/* ---- small screens ------------------------------------------------------- */

@media (max-width: 640px) {
    .sim-about {
        margin: 2rem auto 1rem;
        padding: 0 1rem;
        font-size: 0.95rem;
    }

    .sim-about h2 {
        font-size: 1.3rem;
    }

    .sim-about h3 {
        font-size: 1.05rem;
        margin-top: 1.4rem;
    }

    .sim-about summary {
        padding: 0.75rem 2.3rem 0.75rem 0.85rem;
    }

    .sim-about details > p {
        padding-left: 0.85rem;
        padding-right: 0.85rem;
    }
}

/* Respect a reader who has asked for less motion. */
@media (prefers-reduced-motion: reduce) {
    .sim-about summary::after {
        transition: none;
    }
}