/* ============================================================
   YummyMath — Activity detail page (Step 5)
   ------------------------------------------------------------
   Converted from "Activity page.html". Shared chrome (nav/footer,
   design tokens, buttons) lives in assets/theme.css — this file only
   holds the page-specific breadcrumb, activity layout, engagement
   buttons, related-activities sidebar, and closer band.
   ============================================================ */

/* BREADCRUMB — shared .crumbs/.crumbs__inner now lives in theme.css */

/* ---------- ACTIVITY (post / detail page) ---------- */
.activity-page { background: #FFFFFF; border-top: 1px solid var(--color-divider); }
.activity-layout { max-width: 1140px; margin: 0 auto; padding: 2.5rem 2.5rem 3.25rem; display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 4.5rem; align-items: start; }
.activity { min-width: 0; }
.activity__inner { max-width: 760px; margin: 0 auto; }
.activity__pills { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; }
.activity__pill { font-size: 0.75rem; font-weight: 600; background: #DCEEEA; color: var(--color-green); padding: 0.25rem 0.6rem; border-radius: 3px; }
.activity__pill--grade { background: #EFEDE7; color: var(--color-text-muted); }
.activity__pill--free { background: var(--color-accent-deep); color: #FFFFFF; }
.activity__title { font-family: var(--font-serif); font-size: 2.1rem; font-weight: 600; color: var(--color-text); line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 0.6rem; }
.activity__byline { font-size: 0.9rem; color: var(--color-text-muted); display: flex; gap: 0.6rem; align-items: center; margin-bottom: 0.9rem; }
.activity__engage { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.9rem; }
.engage-btn { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.4rem 0.9rem; border: 1px solid var(--color-divider); background: #FFFFFF; border-radius: 999px; font-family: inherit; font-size: 0.85rem; font-weight: 600; color: var(--color-text); cursor: pointer; transition: border-color 0.15s, color 0.15s, background 0.15s; }
.engage-btn:hover { border-color: var(--color-green); color: var(--color-green); }
.engage-btn svg { width: 16px; height: 16px; }
.engage-btn--active { border-color: var(--color-green); color: var(--color-green); background: #F3FAF8; }
.engage-btn--active svg { fill: currentColor; stroke: currentColor; }
.activity__dot { opacity: 0.6; }
.activity__body { font-size: 1.02rem; line-height: 1.7; color: var(--color-text); }
.activity__body p { margin: 0 0 1.1rem; }
.activity__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 2.25rem 0 0; }
.act-btn { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.85rem 1.4rem; border-radius: 10px; font-weight: 700; font-size: 1rem; line-height: 1; text-decoration: none; border: none; cursor: pointer; }
.act-btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.act-btn--activity { background: var(--color-green); color: #FFFFFF; }
.act-btn--activity:hover { background: var(--color-green-dark); }
.act-btn--solutions { background: var(--color-accent-deep); color: #FFFFFF; }
.act-btn--solutions:hover { background: #6E5619; }
.activity__meta { margin-top: 2.25rem; padding-top: 1.75rem; border-top: 1px solid var(--color-divider); display: flex; flex-direction: column; gap: 1.5rem; }
.activity__meta-title { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); margin: 0 0 0.7rem; }
.activity__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.activity__tag { font-size: 0.82rem; color: var(--color-text); background: #F3F1EA; border: 1px solid var(--color-divider); padding: 0.25rem 0.6rem; border-radius: 999px; text-decoration: none; }
.activity__tag:hover { border-color: var(--color-green); color: var(--color-green); }

/* ---------- COMMENTS (existing feature, restyled to match theme) ---------- */
.activity__comments { margin-top: 2.25rem; padding-top: 1.75rem; border-top: 1px solid var(--color-divider); }
.activity__comments-title { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 600; color: var(--color-text); margin: 0 0 1rem; }
.comment-form textarea { width: 100%; min-height: 90px; padding: 0.65rem 0.85rem; border: 1px solid var(--color-divider); border-radius: 8px; font-family: inherit; font-size: 0.95rem; color: var(--color-text); resize: vertical; }
.comment-form textarea:focus { outline: none; border-color: var(--color-green); }
.comment-item { display: flex; gap: 0.7rem; align-items: flex-start; padding: 0.85rem 0; border-bottom: 1px solid var(--color-divider); }
.comment-item__avatar { width: 40px; height: 40px; border-radius: 8px; flex-shrink: 0; object-fit: cover; }
.comment-item__name { font-weight: 600; font-size: 0.9rem; color: var(--color-text); }
.comment-item__date { font-size: 0.78rem; color: var(--color-text-muted); }

/* ---------- MORE ACTIVITIES (sidebar list) ---------- */
.related { position: sticky; top: 1.5rem; align-self: start; }
.related__title { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 600; color: var(--color-text); margin: 0 0 1rem; }
.related__list { display: flex; flex-direction: column; gap: 0.5rem; }
.rel-card { display: flex; gap: 0.7rem; align-items: center; text-decoration: none; padding: 0.5rem; border-radius: 8px; transition: background 0.15s; }
.rel-card:hover { background: var(--color-cream); }
.rel-card__thumb { width: 54px; height: 54px; border-radius: 6px; flex-shrink: 0; background-size: cover; background-position: center; }
.rel-card__body { display: flex; flex-direction: column; gap: 0.15rem; min-width: 0; }
.rel-card__title { font-size: 0.9rem; font-weight: 600; color: var(--color-text); line-height: 1.3; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rel-card__meta { font-size: 0.78rem; color: var(--color-text-muted); }
.related__all { display: inline-block; margin-top: 1.1rem; font-size: 0.88rem; font-weight: 600; color: var(--color-green); text-decoration: none; }
.related__all:hover { text-decoration: underline; }
.rel-thumb--a { background-color: #FFE7C2; background-image: linear-gradient(135deg, #FFE7C2, #FFD08A); }
.rel-thumb--b { background-color: #DDE7FF; background-image: linear-gradient(135deg, #DDE7FF, #AEC6F5); }
.rel-thumb--c { background-color: #E7F4E2; background-image: linear-gradient(135deg, #E7F4E2, #BFE3B4); }
.rel-thumb--d { background-color: #FCE2EC; background-image: linear-gradient(135deg, #FCE2EC, #F5B8CE); }

@media (max-width: 860px) {
  .activity-layout { grid-template-columns: 1fr; gap: 2.25rem; padding: 2rem 1.25rem 2.5rem; }
  .related { position: static; }
}

/* ---------- CLOSER ---------- */
.closer { background: var(--color-green); color: #FFFFFF; padding: 3rem 2.5rem; text-align: center; }
.closer__inner { max-width: 880px; margin: 0 auto; }
.closer__headline { font-family: var(--font-serif); font-size: 2rem; font-weight: 600; line-height: 1.15; margin-bottom: 0.9rem; }
.closer__sub { font-size: 1.02rem; line-height: 1.55; margin-bottom: 1.6rem; opacity: 0.95; max-width: 600px; margin-left: auto; margin-right: auto; }
.closer .ym-btn--light { background: #FFFFFF; color: var(--color-green); }
.closer .ym-btn--light:hover { background: var(--color-cream); }
.closer__note { margin-top: 1rem; font-size: 0.85rem; opacity: 0.85; }

@media (max-width: 720px) {
  .closer__headline { font-size: 1.7rem; }
}