/* SEO navigation / innehållsförteckning */
.math-toc {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 18px;

    margin: 30px 0 38px;
    padding: 18px 20px;

    background: rgba(15, 18, 28, 0.88);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 14px;

    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    backdrop-filter: blur(8px);
}

.math-toc strong {
    color: #fff;
    margin-right: 4px;
}

.math-toc a {
    color: #39e68a;
    text-decoration: none;
    font-weight: 600;

    padding: 7px 10px;
    border-radius: 8px;

    transition: background .2s ease, color .2s ease;
}

.math-toc a:hover {
    background: rgba(57,230,138,0.12);
    color: #65f3a5;
}

.siteicon {
    display: flex;
    align-items: flex-start;
    gap: 18px;
}

.siteicon h1 {
    margin: 0;
    max-width: 950px;

    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.siteicon i {
    margin-top: 9px;
    font-size: 2.1rem;
}

.hp-math-section {
    margin-top: 46px;
}

.hp-math-section h2 {
    margin: 0 0 20px;

    font-size: clamp(1.65rem, 3vw, 2.2rem);
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.accordion {
	    display: flex;
    align-items: center;
    justify-content: space-between;

    width: 100%;

    margin: 0 0 12px;
    padding: 20px 22px;

    background: rgba(17, 19, 27, 0.96);
    color: #fff;

    border: 1px solid rgba(255,255,255,0.04);
    border-radius: 14px;

    font-size: 1rem;
    font-weight: 700;
    text-align: left;

    cursor: pointer;

    transition:
        background .2s ease,
        border-color .2s ease,
        transform .15s ease;
}

.accordion:hover {
    background: rgba(24, 27, 37, 0.98);
    border-color: rgba(57,230,138,0.22);
}

.accordion:focus-visible {
    outline: 2px solid #39e68a;
    outline-offset: 3px;
}

.accordion::after {
    content: "+";

    flex: 0 0 24px;
    width: 24px;
    height: 24px;

    display: flex;
    align-items: center;
    justify-content: center;

    margin-left: 20px;

    color: #39e68a;
    font-size: 24px;
    font-weight: 700;
    line-height: 24px;

    float: none;

    transform: none !important;
    rotate: none !important;

    border: 0 !important;
    background: none !important;

    position: static !important;

    transition: none;
}

.accordion.active::after {
    content: "−";
    transform: none !important;
    rotate: none !important;
}

@media (max-width: 700px) {

    .math-toc {
        gap: 8px;
        padding: 16px;
    }

    .math-toc strong {
        width: 100%;
        margin-bottom: 4px;
    }

    .math-toc a {
        padding: 6px 8px;
    }

    .accordion {
        padding: 17px 18px;
    }
}


.topic-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;

    padding: 14px 16px;
    margin: 20px 0;

    background: rgba(255,255,255,.96);
    border: 1px solid rgba(0,0,0,.06);
    border-radius: 14px;

    box-shadow: 0 4px 18px rgba(0,0,0,.06);
}

.topic-nav-label {
    font-weight: 700;
    color: #344054;
    margin-right: 4px;
}

.topic-nav a {
    display: inline-flex;
    align-items: center;

    padding: 8px 13px;

    border-radius: 999px;
    background: #f3f5f7;

    color: #137a4b;
    font-weight: 600;
    text-decoration: none;

    transition:
        background .15s ease,
        transform .15s ease,
        box-shadow .15s ease;
}

.topic-nav a:hover {
    background: #e6f7ee;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0,0,0,.08);
}

@media (max-width: 700px) {

    .topic-nav {
        gap: 8px;
        padding: 12px;
    }

    .topic-nav-label {
        width: 100%;
        margin-bottom: 2px;
    }

    .topic-nav a {
        padding: 7px 11px;
        font-size: 14px;
    }
}