/* Shared styles: mobile nav dropdown + abstract disclosures */

/* --- Mobile header: wordmark left, page switcher right --- */
.m-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
    .m-head { display: none; }
}

/* --- Page switcher (a <details>, not a hamburger) --- */
/* The header sits above the full-screen panel so the toggle still closes it. */
.m-head > a { position: relative; z-index: 60; }

.mnav { position: relative; }

.mnav > summary {
    position: relative;
    z-index: 60;
    list-style: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    color: #111827;
    -webkit-tap-highlight-color: transparent;
}

.mnav > summary::-webkit-details-marker { display: none; }
.mnav > summary::marker { content: ""; }

/* chevron */
.mnav > summary::after {
    content: "";
    width: .34em;
    height: .34em;
    border-right: 1.25px solid currentColor;
    border-bottom: 1.25px solid currentColor;
    transform: translateY(-.18em) rotate(45deg);
    transition: transform .25s ease;
}

.mnav[open] > summary::after {
    transform: translateY(.06em) rotate(-135deg);
}

.mnav > summary:hover { color: #4b5563; }

/* Full-screen menu */
.mnav-panel {
    position: fixed;
    inset: 0;
    z-index: 55;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
    padding: 0 1.5rem;
    text-align: right;
    background: #f9fafb;
    animation: mnav-in .22s ease-out;
}

@keyframes mnav-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.mnav-panel a {
    display: block;
    padding: .7rem 0;
    font-size: 2rem;
    line-height: 1.25;
    letter-spacing: -.01em;
    color: #111827;
    text-decoration: none;
}

.mnav-panel a:hover { color: #4b5563; }

/* current page */
.mnav-panel a[aria-current="page"] { color: #9ca3af; }

@media (prefers-reduced-motion: reduce) {
    .mnav > summary::after { transition: none; }
    .mnav-panel { animation: none; }
}

/* --- Research: abstract disclosure --- */
.paper + .paper { margin-top: 3.5rem; }

.paper-links {
    margin-top: .4rem;
    color: #6b7280;
}

.paper-links a {
    color: #6b7280;
    text-decoration: none;
    border-bottom: 1px solid rgba(17, 24, 39, .18);
}

.paper-links a:hover {
    color: #111827;
    border-bottom-color: currentColor;
}

.paper-links .sep {
    margin: 0 .55rem;
    color: #d1d5db;
}

.abs { margin-top: .85rem; }

.abs > summary {
    list-style: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: #6b7280;
    -webkit-tap-highlight-color: transparent;
}

.abs > summary::-webkit-details-marker { display: none; }
.abs > summary::marker { content: ""; }

.abs > summary::after {
    content: "";
    width: .3em;
    height: .3em;
    border-right: 1.25px solid currentColor;
    border-bottom: 1.25px solid currentColor;
    transform: translateY(-.16em) rotate(45deg);
    transition: transform .25s ease;
}

.abs[open] > summary::after {
    transform: translateY(.05em) rotate(-135deg);
}

.abs > summary:hover { color: #111827; }

.abs-body {
    margin-top: .85rem;
    padding-left: 1.1rem;
    border-left: 1px solid rgba(17, 24, 39, .12);
}

@media (prefers-reduced-motion: reduce) {
    .abs > summary::after { transition: none; }
}