/* "Learn about mangroves": a magazine-style feature in the bulletin (includes/viewer_learn.php).
   Uses the bulletin's tokens (--pub-*) so light and dark mode both work. */
.lrn { margin: 12px 0 44px; color: var(--pub-ink); }
.lrn-kicker { font-size: .74rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--pub-accent); margin: 0 0 6px; }

/* opener */
.lrn-cover { position: relative; min-height: 420px; display: flex; align-items: flex-end; border-radius: 4px; overflow: hidden; margin-bottom: 36px;
    background-color: #1d5c3f; background-size: cover; background-position: center; background-repeat: no-repeat; color: #fff; }
.lrn-cover-plain { background: radial-gradient(circle at 80% 10%, #2f7a55 0, #1d5c3f 45%, #0f2e20 100%); min-height: 320px; }
.lrn-cover-in { padding: 40px 44px 36px; max-width: 760px; }
.lrn-cover .lrn-kicker { color: #fcd9a8; }
.lrn-title { font-family: var(--pub-serif); font-size: clamp(2.3rem, 6vw, 4.2rem); line-height: 1.02; font-weight: 600; margin: 0 0 12px; letter-spacing: -.01em; color: #fff; }
.lrn-dek { font-family: var(--pub-serif); font-style: italic; font-size: clamp(1.08rem, 2.2vw, 1.35rem); line-height: 1.45; margin: 0 0 14px; color: rgba(255, 255, 255, .92); }
.lrn-by { font-size: .82rem; letter-spacing: .02em; color: rgba(255, 255, 255, .78); margin: 0 0 18px; }
.lrn-jump { display: flex; gap: 10px; flex-wrap: wrap; }
html.pub .lrn-jump a { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 999px; background: rgba(255, 255, 255, .14); color: #fff;
    border: 1px solid rgba(255, 255, 255, .35); text-decoration: none; font-weight: 700; font-size: .9rem; backdrop-filter: blur(4px); min-height: 44px; }
html.pub .lrn-jump a:first-child { background: #fff; color: #14382a; border-color: #fff; }
html.pub .lrn-jump a:hover { background: rgba(255, 255, 255, .26); color: #fff; } html.pub .lrn-jump a:first-child:hover { background: #eef6f0; color: #14382a; }
.lrn-cover-cap { position: absolute; right: 12px; bottom: 8px; margin: 0; font-size: .7rem; color: rgba(255, 255, 255, .7); }

/* essay with contents rail */
.lrn-body { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 48px; align-items: start; }
.lrn-toc { position: sticky; top: 84px; font-size: .9rem; min-width: 0; }
.lrn-toc-h { font-size: .74rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--pub-muted); margin: 0 0 10px;
    padding-bottom: 8px; border-bottom: 2px solid var(--pub-rule-strong); }
.lrn-toc ol { list-style: none; margin: 0 0 22px; padding: 0; }
.lrn-toc li a { display: flex; gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--pub-rule); color: var(--pub-ink-2); text-decoration: none; line-height: 1.3; }
.lrn-toc li a span { font-family: var(--pub-serif); color: var(--pub-accent); min-width: 22px; font-weight: 600; }
.lrn-toc li a:hover, .lrn-toc li a.on { color: var(--pub-green); font-weight: 700; }
.lrn-note { background: var(--pub-green-soft); border-left: 3px solid var(--pub-green); padding: 14px 16px; border-radius: 0 8px 8px 0; }
.lrn-note-h { font-weight: 800; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--pub-green); margin: 0 0 6px; }
.lrn-note p:not(.lrn-note-h) { font-family: var(--pub-serif); font-style: italic; font-size: 1.02rem; line-height: 1.45; margin: 0 0 8px; color: var(--pub-ink); }
.lrn-link { background: none; border: none; padding: 0; color: var(--pub-green); font: inherit; font-weight: 700; font-size: .85rem; cursor: pointer; }

.lrn-article { max-width: 720px; font-family: var(--pub-serif); font-size: 1.13rem; line-height: 1.7; color: var(--pub-ink); }
.lrn-ch { padding: 0 0 30px; margin: 0 0 30px; border-bottom: 1px solid var(--pub-rule); scroll-margin-top: 90px; }
.lrn-ch:last-child { border-bottom: none; }
.lrn-ch-n { font-family: 'Roboto', system-ui, sans-serif; font-size: .74rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--pub-accent); margin: 0 0 4px; }
.lrn-ch h3 { font-family: var(--pub-serif); font-size: clamp(1.6rem, 3.4vw, 2.1rem); line-height: 1.15; font-weight: 600; margin: 0 0 14px; color: var(--pub-ink); }
.lrn-ch p { margin: 0 0 14px; }
.lrn-drop::first-letter { float: left; font-size: 4.1em; line-height: .82; font-weight: 600; margin: .06em .1em 0 0; color: var(--pub-green); }
.lrn-points { margin: 6px 0 18px; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px 24px; }
.lrn-points dt { font-family: 'Roboto', system-ui, sans-serif; font-weight: 800; font-size: .95rem; color: var(--pub-green); }
.lrn-points dt i { width: 20px; } .lrn-points dd { margin: 2px 0 0; font-size: 1.02rem; line-height: 1.55; color: var(--pub-ink-2); }
.lrn-pull { margin: 22px 0 8px; padding: 18px 0 18px 24px; border-left: 4px solid var(--pub-accent); font-family: var(--pub-serif); font-style: italic;
    font-size: clamp(1.3rem, 2.8vw, 1.65rem); line-height: 1.35; color: var(--pub-ink); }
.lrn-roots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 8px 0 18px; }
.lrn-roots figure { margin: 0; text-align: center; color: var(--pub-green); }
.lrn-roots svg { width: 100%; max-width: 150px; height: auto; }
.lrn-roots figcaption { font-family: 'Roboto', system-ui, sans-serif; font-size: .85rem; line-height: 1.45; color: var(--pub-ink-2); }
.lrn-roots figcaption b { display: block; color: var(--pub-ink); font-size: .95rem; }
.lrn-fig { margin: 8px 0 18px; padding: 16px; background: var(--pub-surface); border: 1px solid var(--pub-rule); }
.lrn-zone { display: block; width: 100%; height: auto; color: var(--pub-ink); }
.lrn-fig figcaption { font-family: 'Roboto', system-ui, sans-serif; font-size: .84rem; color: var(--pub-muted); margin-top: 8px; }
.lrn-list, .lrn-steps { margin: 0 0 14px; padding-left: 22px; } .lrn-list li, .lrn-steps li { margin-bottom: 8px; }
.lrn-steps li::marker { font-weight: 700; color: var(--pub-accent); }
.lrn-aside { font-style: italic; color: var(--pub-ink-2); border-top: 1px solid var(--pub-rule); padding-top: 12px; }
.lrn-law { font-family: 'Roboto', system-ui, sans-serif; font-size: .9rem !important; line-height: 1.55; background: var(--pub-green-soft); padding: 12px 14px; border-radius: 6px; }

/* field guide plates */
.lrn-part { margin-top: 44px; padding-top: 22px; border-top: 3px double var(--pub-rule-strong); scroll-margin-top: 90px; }
.lrn-part-title { font-family: var(--pub-serif); font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 600; line-height: 1.15; margin: 0 0 6px; color: var(--pub-ink); }
.lrn-part-dek { font-family: var(--pub-serif); font-style: italic; font-size: 1.08rem; color: var(--pub-ink-2); margin: 0 0 16px; }
.lrn-filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.lrn-filters input[type="search"], .lrn-filters select { padding: 10px 12px; border: 1px solid var(--pub-rule); border-radius: 6px; font: inherit; background: var(--pub-surface); color: var(--pub-ink); min-height: 44px; }
.lrn-filters input[type="search"] { flex: 1 1 260px; }
.lrn-check { display: inline-flex; gap: 6px; align-items: center; font-size: .92rem; cursor: pointer; }
.lrn-plates { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; align-items: start; }
.lrn-plate { background: var(--pub-surface); border: 1px solid var(--pub-rule); box-shadow: var(--pub-shadow); transition: transform .15s, box-shadow .15s; }
.lrn-plate:hover { transform: translateY(-2px); }
.lrn-plate summary { list-style: none; cursor: pointer; display: flex; flex-direction: column; align-items: center; text-align: center; padding: 16px 16px 18px; gap: 4px; }
.lrn-plate summary::-webkit-details-marker { display: none; }
.lrn-plate summary:focus-visible { outline: 3px solid var(--pub-focus); outline-offset: 2px; }
.lrn-plate-n { align-self: stretch; font-size: .7rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--pub-accent);
    border-bottom: 1px solid var(--pub-rule); padding-bottom: 8px; margin-bottom: 10px; }
.lrn-plate-img, .lrn-plate-art { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; border: 3px solid var(--pub-green-soft); margin-bottom: 8px; }
.lrn-plate-art { display: flex; align-items: center; justify-content: center; background: var(--pub-green-soft); color: var(--pub-green); font-size: 2rem; }
.lrn-plate-name { font-family: var(--pub-serif); font-size: 1.35rem; font-weight: 600; line-height: 1.15; }
.lrn-plate-sci { font-family: var(--pub-serif); font-style: italic; color: var(--pub-ink-2); font-size: 1rem; }
.lrn-plate-meta { font-size: .8rem; color: var(--pub-muted); margin-top: 4px; }
.lrn-seen { margin-top: 6px; font-size: .78rem; font-weight: 700; color: var(--pub-green); }
.lrn-plate[open] summary { padding-bottom: 8px; }
.lrn-plate dl { margin: 0; padding: 4px 18px 18px; font-size: .93rem; line-height: 1.55; color: var(--pub-ink-2); }
.lrn-plate dt { font-size: .7rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--pub-accent); margin-top: 10px; }
.lrn-plate dd { margin: 2px 0 0; }

/* quiz + glossary */
.lrn-duo { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 40px; margin-top: 44px; padding-top: 22px; border-top: 3px double var(--pub-rule-strong); }
.lrn-quizwrap, .lrn-wordswrap { scroll-margin-top: 90px; }
.lrn-quiz { background: var(--pub-surface); border: 1px solid var(--pub-rule); padding: 22px; box-shadow: var(--pub-shadow); min-height: 120px; }
.lrn-qhead { display: flex; justify-content: space-between; font-size: .8rem; color: var(--pub-muted); font-weight: 700; letter-spacing: .04em; }
.lrn-qbar { height: 4px; background: var(--pub-rule); margin: 8px 0 16px; overflow: hidden; } .lrn-qbar > div { height: 100%; background: var(--pub-green); transition: width .3s; }
.lrn-q { font-family: var(--pub-serif); font-size: 1.35rem; font-weight: 600; margin: 0 0 14px; line-height: 1.3; }
.lrn-opts { display: grid; gap: 8px; }
.lrn-opt { display: flex; gap: 12px; align-items: center; text-align: left; border: 1px solid var(--pub-rule); background: var(--pub-paper); color: var(--pub-ink);
    border-radius: 6px; padding: 11px 14px; font: inherit; font-size: .97rem; cursor: pointer; min-height: 46px; }
.lrn-opt span { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--pub-rule); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: .8rem; }
.lrn-opt:hover:not(:disabled) { border-color: var(--pub-green); }
.lrn-opt:focus-visible { outline: 3px solid var(--pub-focus); outline-offset: 2px; }
.lrn-opt.ok { background: #dcfce7; border-color: #16a34a; color: #14532d; font-weight: 700; }
.lrn-opt.bad { background: #fee2e2; border-color: #dc2626; color: #7f1d1d; }
.lrn-opt:disabled { cursor: default; }
.lrn-expl { margin-top: 14px; line-height: 1.6; } .lrn-expl .pub-btn { margin-top: 10px; }
.lrn-done { text-align: center; } .lrn-done h4 { font-family: var(--pub-serif); font-size: 1.4rem; margin: 6px 0; }
.lrn-score { font-family: var(--pub-serif); font-size: 4rem; font-weight: 600; color: var(--pub-green); line-height: 1; } .lrn-score small { font-size: 1.6rem; color: var(--pub-muted); }
.lrn-words { margin: 0; columns: 2 240px; column-gap: 28px; }
.lrn-words > div { break-inside: avoid; padding: 10px 0; border-bottom: 1px solid var(--pub-rule); }
.lrn-words dt { font-family: var(--pub-serif); font-weight: 600; font-size: 1.12rem; color: var(--pub-ink); }
.lrn-words dd { margin: 2px 0 0; color: var(--pub-ink-2); line-height: 1.5; font-size: .93rem; }

@media (max-width: 960px) {
    .lrn-body { grid-template-columns: minmax(0, 1fr); gap: 20px; }
    .lrn-toc { position: static; min-width: 0; }
    .lrn-toc ol { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 14px; scrollbar-width: thin; }
    .lrn-toc li a { white-space: nowrap; border: 1px solid var(--pub-rule); border-radius: 999px; padding: 8px 14px; }
    .lrn-duo { grid-template-columns: minmax(0, 1fr); gap: 32px; }
}
@media (max-width: 640px) {
    .lrn-cover { min-height: 460px; } .lrn-cover-in { padding: 28px 20px 26px; }
    .lrn-article { font-size: 1.06rem; }
    .lrn-roots { grid-template-columns: 1fr; } .lrn-roots figure { display: grid; grid-template-columns: 96px 1fr; gap: 12px; text-align: left; align-items: center; }
    .lrn-plates { grid-template-columns: 1fr 1fr; gap: 12px; }
    .lrn-plate summary { padding: 12px 10px 14px; } .lrn-plate-img, .lrn-plate-art { width: 72px; height: 72px; }
    .lrn-plate-name { font-size: 1.12rem; }
}
@media (prefers-reduced-motion: reduce) { .lrn-plate, .lrn-qbar > div { transition: none; } .lrn-plate:hover { transform: none; } }

/* front-page teaser card (VIEWER.php) and the standalone page (learn.php) */
.lrn-teaser { margin: 8px 0 40px; }
html.pub .lrn-teaser-in { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); background: var(--pub-surface); border: 1px solid var(--pub-rule);
    box-shadow: var(--pub-shadow); color: var(--pub-ink); text-decoration: none; overflow: hidden; transition: box-shadow .2s; }
html.pub .lrn-teaser-in:hover { box-shadow: 0 10px 28px rgba(22, 32, 27, .14); }
html.pub .lrn-teaser-in:focus-visible { outline: 3px solid var(--pub-focus); outline-offset: 3px; }
.lrn-teaser-img { min-height: 240px; background: radial-gradient(circle at 70% 20%, #2f7a55 0, #1d5c3f 50%, #0f2e20 100%); background-size: cover; background-position: center; }
.lrn-teaser-txt { display: flex; flex-direction: column; gap: 8px; padding: 26px 30px; justify-content: center; }
.lrn-teaser-title { font-family: var(--pub-serif); font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 600; line-height: 1.1; color: var(--pub-ink); }
.lrn-teaser-dek { font-family: var(--pub-serif); font-style: italic; font-size: 1.08rem; line-height: 1.5; color: var(--pub-ink-2); }
.lrn-teaser-meta { display: flex; gap: 16px; flex-wrap: wrap; font-size: .85rem; color: var(--pub-muted); }
.lrn-teaser-meta i { color: var(--pub-green); margin-right: 4px; }
.lrn-teaser-cta { margin-top: 6px; font-weight: 700; color: var(--pub-green); }
.pub-learn-page { padding-top: 24px; }
.pub-learn-page .lrn { margin-top: 0; }
.lrn-back { margin: 0 0 40px; text-align: center; }
@media (max-width: 640px) { html.pub .lrn-teaser-in { grid-template-columns: 1fr; } .lrn-teaser-img { min-height: 170px; } .lrn-teaser-txt { padding: 20px; } }