/* Course list cards and the course page (outline, aside, teaser previews). */
/* ---- Course card ---------------------------------------------------------------- */
.course-grid { display: grid; gap: var(--s-5); grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.ccard {
  position: relative; display: flex; flex-direction: column; min-width: 0;
  background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow-1);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur);
}
.ccard--available:hover { box-shadow: var(--shadow-3); transform: translateY(-3px); border-color: var(--c-line-strong); }
.ccard--available:has(.ccard__link:focus-visible) { outline: 3px solid var(--c-focus); outline-offset: 3px; }
.ccard__cover { position: relative; aspect-ratio: 16 / 9; background: var(--c-surface-2); overflow: hidden; }
.ccard__cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 600ms var(--ease); }
.ccard--available:hover .ccard__cover img { transform: scale(1.03); }
.ccard__badge { position: absolute; top: var(--s-3); left: var(--s-3); }
.ccard__body { display: flex; flex-direction: column; gap: var(--s-3); padding: var(--s-5); flex: 1; }
.ccard__title { font-size: var(--fs-md); line-height: 1.3; }
.ccard__link { color: inherit; text-decoration: none; }
.ccard__link:focus-visible { outline: none; }
.ccard__link::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.ccard__meta { font-size: var(--fs-sm); color: var(--c-text-muted); display: flex; gap: var(--s-2); align-items: center; flex-wrap: wrap; }
.ccard__foot { margin-top: auto; display: grid; gap: var(--s-3); padding-top: var(--s-2); }
.ccard__cta { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--c-accent-text); font-weight: var(--fw-medium); }
.ccard--available:hover .ccard__cta .i { transform: translateX(3px); }
.ccard__cta .i { transition: transform var(--dur) var(--ease); }
.ccard--locked .ccard__cover img { filter: saturate(0.6) brightness(0.98); }
.ccard--locked .ccard__cover::after {
  content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, var(--c-soon-veil-from));
}
.ccard__lock {
  position: absolute; right: var(--s-3); bottom: var(--s-3); z-index: 1;
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: var(--c-surface); color: var(--c-text-muted); box-shadow: var(--shadow-2);
}
.price-row { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.price { font-family: var(--font-display); font-size: var(--fs-md); font-weight: var(--fw-semibold); }
.fake-btn {
  display: inline-flex; align-items: center; gap: var(--s-2); min-height: 36px; padding: 0 var(--s-4);
  border-radius: var(--r-pill); border: 1px dashed var(--c-line-strong); color: var(--c-text-muted); font-size: var(--fs-sm); font-weight: var(--fw-medium);
}

/* Fallback cover (no image) */
.cover-fallback {
  position: absolute; inset: 0; display: grid; place-items: center;
  background:
    radial-gradient(circle at 30% 60%, var(--c-cover-a) 0 22%, transparent 22.5%),
    radial-gradient(circle at 58% 48%, var(--c-cover-b) 0 26%, transparent 26.5%),
    var(--c-cover-c);
}
.cover-fallback span {
  font-family: var(--font-display); font-size: 3.5rem; font-weight: var(--fw-semibold); color: var(--c-text);
  opacity: 0.85; transform: translateX(8%);
}

/* Featured (my course) card: horizontal at desktop */
@media (min-width: 900px) {
  .course-grid--featured { grid-template-columns: 1fr; }
  .course-grid--featured .ccard { flex-direction: row; }
  .course-grid--featured .ccard__cover { width: 46%; aspect-ratio: auto; min-height: 280px; }
  .course-grid--featured .ccard__body { padding: var(--s-6); justify-content: center; }
  .course-grid--featured .ccard__title { font-size: var(--fs-lg); }
}

/* ---- Course page ---------------------------------------------------------------- */
.course-hero { display: grid; gap: var(--s-5); align-items: center; margin-bottom: var(--s-7); }
.course-hero__cover { border-radius: var(--r-lg); overflow: hidden; aspect-ratio: 16 / 9; position: relative; background: var(--c-surface-2); box-shadow: var(--shadow-2); }
.course-hero__cover img { width: 100%; height: 100%; object-fit: cover; }
.course-hero__text { display: grid; gap: var(--s-4); }
.course-hero__desc { font-size: var(--fs-md); line-height: 1.6; color: var(--c-text-muted); max-width: 60ch; }
.teacher-line { display: flex; align-items: center; gap: var(--s-3); }
.teacher-line .avatar { width: 40px; height: 40px; }
@media (min-width: 900px) {
  .course-hero { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--s-7); }
  .course-hero__cover { order: 2; }
}

.continue {
  display: flex; align-items: center; gap: var(--s-4); flex-wrap: wrap;
  padding: var(--s-4) var(--s-5); border-radius: var(--r-lg);
  background: var(--c-accent-soft); border: 1px solid color-mix(in oklab, var(--c-accent) 25%, transparent);
}
.continue__text { flex: 1; min-width: 200px; display: grid; gap: 2px; }
.continue__text strong { font-family: var(--font-display); font-size: var(--fs-md); }

.course-layout { display: grid; gap: var(--s-7); }
@media (min-width: 900px) {
  .course-layout { grid-template-columns: minmax(0, 1fr) 340px; align-items: start; }
  .course-aside { position: sticky; top: calc(var(--header-h) + var(--s-4)); }
}
.course-aside { display: grid; gap: var(--s-4); }

.status-strip { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-4); align-items: center; padding: var(--s-3) var(--s-4); border-radius: var(--r-md); background: var(--c-surface-2); margin-bottom: var(--s-5); }
.status-strip__item { display: inline-flex; align-items: center; gap: var(--s-2); font-size: var(--fs-sm); }
.status-strip__item b { font-variant-numeric: tabular-nums; }

.outline { display: grid; gap: var(--s-4); }
.module { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-lg); overflow: hidden; }
.module > summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: 1fr auto; gap: var(--s-1) var(--s-3); align-items: center;
  padding: var(--s-4) var(--s-5); min-height: var(--tap);
}
.module > summary::-webkit-details-marker { display: none; }
.module > summary:hover { background: var(--c-surface-2); }
.module__title { font-size: var(--fs-md); }
.module__meta { grid-column: 1; font-size: var(--fs-sm); color: var(--c-text-muted); }
.module__chev { grid-row: 1 / span 2; grid-column: 2; color: var(--c-text-muted); transition: transform var(--dur) var(--ease); }
.module[open] .module__chev { transform: rotate(180deg); }
.lessons { list-style: none; padding: 0; }
.lrow { border-top: 1px solid var(--c-line); }
.lrow__link {
  display: grid; grid-template-columns: 32px minmax(0, 1fr) auto; gap: var(--s-1) var(--s-4); align-items: center;
  padding: var(--s-3) var(--s-5); min-height: 64px; color: var(--c-text); text-decoration: none;
  transition: background-color var(--dur-fast);
}
.lrow__link:hover { background: var(--c-surface-2); }
.lrow__link:focus-visible { outline-offset: -3px; border-radius: 0; }
.lrow__num {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; position: relative;
  border: 1px solid var(--c-line-strong); font-size: var(--fs-sm); color: var(--c-text-muted); font-variant-numeric: tabular-nums;
}
.lrow__watched { position: absolute; right: -5px; bottom: -5px; width: 16px; height: 16px; border-radius: 50%; display: grid; place-items: center; background: var(--c-ok-soft); color: var(--c-ok-text); opacity: 0.5; }
.lrow__watched .i { width: 11px; height: 11px; stroke-width: 3; }
.lrow__watched--legend { position: static; opacity: 1; }
.lrow__main { display: grid; gap: 2px; min-width: 0; }
.lrow__title { font-weight: var(--fw-medium); overflow-wrap: break-word; hyphens: auto; }
.lrow__meta { display: flex; align-items: center; gap: var(--s-2); font-size: var(--fs-sm); color: var(--c-text-muted); flex-wrap: wrap; }
.lrow__meta .i { width: 15px; height: 15px; }
.lrow--warn .lrow__link { box-shadow: inset 3px 0 0 var(--c-warn); }
.lrow--todo .lrow__num { border-color: var(--c-accent); color: var(--c-accent-text); font-weight: var(--fw-semibold); }
@media (max-width: 639px) {
  .lrow__link { grid-template-columns: 30px minmax(0, 1fr); padding: var(--s-3) var(--s-4); }
  .lrow__link .badge { grid-column: 2; justify-self: start; }
  .module > summary { padding: var(--s-4); }
}
.legend { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; font-size: var(--fs-sm); color: var(--c-text-muted); margin-top: var(--s-4); }

.toc { display: grid; gap: 2px; }
.toc a { display: flex; gap: var(--s-3); align-items: baseline; padding: 8px var(--s-3); min-height: var(--tap); align-items: center; border-radius: var(--r-md); color: var(--c-text); text-decoration: none; font-size: var(--fs-sm); }
.toc a:hover { background: var(--c-surface-2); }
.toc a span:first-child { color: var(--c-text-muted); font-variant-numeric: tabular-nums; min-width: 1.5em; }
.toc-mobile { margin-bottom: var(--s-4); }
.toc-mobile > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; min-height: var(--tap); padding: 0 var(--s-4); border: 1px solid var(--c-line); border-radius: var(--r-md); background: var(--c-surface); font-weight: var(--fw-medium); }
.toc-mobile > summary::-webkit-details-marker { display: none; }
.toc-mobile[open] > summary { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
.toc-mobile .toc { border: 1px solid var(--c-line); border-top: 0; border-radius: 0 0 var(--r-md) var(--r-md); background: var(--c-surface); padding: var(--s-2); }
@media (min-width: 900px) { .toc-mobile { display: none; } }
@media (max-width: 899px) { .aside-toc { display: none; } }

.aside-soon-toggle > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); min-height: var(--tap); padding: var(--s-2) var(--s-4); border: 1px dashed var(--c-soon-line); border-radius: var(--r-md); background: var(--c-surface); font-weight: var(--fw-medium); }
.aside-soon-toggle > summary::-webkit-details-marker { display: none; }
.aside-soon-toggle[open] > summary { margin-bottom: var(--s-4); }
.aside-soon-toggle .chev { transition: transform var(--dur) var(--ease); }
.aside-soon-toggle[open] .chev { transform: rotate(180deg); }
@media (min-width: 900px) { .aside-soon-toggle > summary { display: none; } }

/* Chat preview */
.chat { display: grid; gap: var(--s-3); }
.chat__msg { display: grid; grid-template-columns: 32px 1fr; gap: var(--s-2); font-size: var(--fs-sm); }
.chat__msg .avatar { width: 32px; height: 32px; font-size: var(--fs-xs); }
.chat__bubble { background: var(--c-surface-2); border-radius: 4px var(--r-md) var(--r-md) var(--r-md); padding: var(--s-2) var(--s-3); }
.chat__who { font-weight: var(--fw-semibold); font-size: var(--fs-xs); }

/* Certificate preview */
.cert {
  aspect-ratio: 1.414 / 1; border-radius: var(--r-sm); padding: var(--s-4);
  background: var(--c-surface); border: 1px solid var(--c-line); box-shadow: var(--shadow-1);
  display: grid; align-content: center; justify-items: center; text-align: center; gap: 6px; position: relative;
}
.cert::before { content: ""; position: absolute; inset: 6px; border: 1px solid var(--c-soon-line); border-radius: 3px; }
.cert__title { font-family: var(--font-display); font-weight: var(--fw-semibold); font-size: var(--fs-md); }
.cert__course { font-size: var(--fs-xs); color: var(--c-text-muted); max-width: 26ch; }
.cert__name { font-family: var(--font-display); font-style: italic; }
.cert .i { color: var(--c-soon-text); }