/* Course index page styles - component vocabulary shared with the
   Rsquared Academy site family (tokens in tokens.css). */

/* ---------- Layout / helpers ---------- */

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 1.25rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 1080;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font-weight: 600;
}

.skip-link:focus { top: 1rem; }

/* ---------- Header ---------- */

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }

.site-header .wrap { display: flex; align-items: center; gap: 1.25rem; min-height: 3.5rem; flex-wrap: wrap; }

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 0;
  margin-right: 1.25rem;
}

.navbar-brand:hover { color: var(--accent); border-bottom: 0; }
.navbar-brand img { height: 26px; width: auto; border-radius: 3px; }

.main-nav ul { display: flex; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.main-nav a {
  display: block;
  color: var(--body);
  font-size: 0.9375rem;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  border-bottom: 0;
}
.main-nav a:hover { color: var(--accent); background: var(--line-soft); border-bottom: 0; }
.main-nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: 0.4rem; }

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.4rem;
  height: 2.4rem;
  border-radius: 8px;
  color: var(--ink);
  border-bottom: 0;
  font-size: 1.0625rem;
}

.icon-link:hover { color: var(--ink); background: var(--line-soft); border-bottom: 0; }
.icon-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Theme toggle */

.theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: none;
  color: var(--body);
  cursor: pointer;
  font-size: 1.0625rem;
}

:root[data-theme] .theme-toggle { display: inline-flex; }

.theme-toggle:hover { color: var(--accent); border-color: var(--line); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.theme-icon-light { display: none; }
:root[data-theme="dark"] .theme-icon-dark { display: none; }
:root[data-theme="dark"] .theme-icon-light { display: inline-block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-icon-dark { display: none; }
  :root:not([data-theme="light"]) .theme-icon-light { display: inline-block; }
}

/* Mobile nav */

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 1.15rem;
}

@media (max-width: 767.98px) {
  .nav-toggle { display: inline-flex; order: 2; }
  .site-header .wrap { gap: 0.5rem; }
  .header-actions { order: 1; margin-left: auto; }
  .main-nav { flex-basis: 100%; order: 3; }
  .main-nav.collapse { display: none; }
  .main-nav.collapse.show { display: block; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 0.5rem 0 0.75rem; }
  .main-nav a { padding: 0.55rem 0.5rem; }
}

/* ---------- Hero ---------- */

.hero { padding: 3.25rem 0 0; }

.hero-grid { display: flex; flex-wrap: wrap; gap: 2rem; align-items: flex-start; }
.hero-copy { flex: 1 1 24rem; min-width: 0; }
.hero .hero-art { flex: 0 0 260px; text-align: center; }
.hero .hero-art img { max-width: 260px; width: 100%; height: auto; }

.kicker {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

@media (max-width: 575.98px) {
  .hero .hero-art { flex: 1 1 100%; text-align: center; margin-top: 1rem; }
  .hero .hero-art img { max-width: 200px; }
}

.hero h1 { margin: 0.2rem 0 0.35rem; font-size: 2.5rem; font-weight: 700; letter-spacing: -0.022em; }
.hero .lead { color: var(--muted); font-size: 1.15rem; margin: 0 0 1rem; max-width: 60ch; }
.hero .hero-desc { max-width: 68ch; }

/* Stat strip */

.stats {
  display: flex;
  flex-wrap: wrap;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  gap: 0.35rem 1.1rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.stats li { display: inline-flex; align-items: center; gap: 0.45rem; margin: 0; }
.stats li + li::before { content: "\00b7"; color: var(--line-strong); margin-right: 0.4rem; }
.stats strong { color: var(--ink); font-weight: 600; }

/* CTA row */

.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 0; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.3;
  padding: 0.55rem 1.1rem;
  border-radius: 9px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}

.btn:hover { background: var(--line-soft); color: var(--ink); border-bottom: 1px solid var(--line-strong); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn-primary { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }
.btn-primary:hover { background: var(--ink-hover); border-color: var(--ink-hover); color: var(--on-ink); }

/* ---------- Learning path ---------- */

.lpath { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 1rem 0 1.25rem; }

.lstep { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 0.85rem; }
.lstep .num {
  display: block;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.lstep h3 { font-size: 1rem; margin: 0.25rem 0 0.35rem; }
.lstep p { font-size: 0.8125rem; color: var(--muted); margin: 0; max-width: none; }

.lshortcut {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--note-ink);
  background: var(--note-bg);
  border: 1px solid var(--note-line);
  border-radius: 8px;
  padding: 0.35rem 0.5rem;
}

@media (max-width: 991.98px) { .lpath { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 575.98px) { .lpath { grid-template-columns: 1fr; } }

/* ---------- Filter bar ---------- */

.filterbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.chip {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--body);
  cursor: pointer;
}

.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }

.search { position: relative; margin-left: auto; }
.search .bi { position: absolute; left: 0.7rem; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 0.95rem; pointer-events: none; }
.search input {
  font: inherit;
  font-size: 0.9375rem;
  padding: 0.4rem 0.8rem 0.4rem 2.1rem;
  width: 15rem;
  max-width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--body);
}
.search input::placeholder { color: var(--muted); }
.search input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.result-count { font-size: 0.8125rem; color: var(--muted); margin: 0 0 1rem; }

/* ---------- Course cards ---------- */

.lgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 0 0 2rem; }

@media (max-width: 991.98px) { .lgrid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 575.98px) { .lgrid { grid-template-columns: 1fr; } }

.lcard {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.lcard:hover { transform: translateY(-3px); box-shadow: 0 14px 34px var(--shadow-md); border-color: var(--line-strong); }

.lcover {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--line-soft);
  border-bottom: 1px solid var(--line);
}

.lbody { padding: 0.9rem 1rem 1rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.lbody > p { margin: 0; max-width: none; }

.ltrack {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.lpill {
  font-family: "Source Sans Pro", system-ui, sans-serif;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: none;
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
  background: var(--note-bg);
  color: var(--note-ink);
}

.lpill.beg { background: var(--beg-bg); color: var(--beg-ink); }
.lpill.int { background: var(--int-bg); color: var(--int-ink); }
.lpill.adv { background: var(--adv-bg); color: var(--adv-ink); }

.lbody h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
  margin: 0;
  line-height: 1.25;
  border: 0;
  padding: 0;
}

.lbody h2 a { color: var(--ink); border-bottom: 0; }
.lbody h2 a:hover { color: var(--accent); }

.lout { color: var(--muted); font-size: 0.875rem; line-height: 1.5; }

.lcard details {
  font-size: 0.8125rem;
  color: var(--body);
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 0.4rem 0.55rem;
}

.lcard details summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.lcard details summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.lcard details ul { margin: 0.5rem 0 0.25rem 1.1rem; padding: 0; max-height: 168px; overflow: auto; }
.lcard details li { font-size: 0.8125rem; }

.lactions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; padding-top: 0.35rem; }

.labtn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  color: var(--ink);
  background: var(--surface);
  border-bottom: 1px solid var(--line-strong);
}

.labtn:hover { color: var(--ink); background: var(--line-soft); }
.labtn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.labtn.primary { background: var(--ink); border-color: var(--ink); color: var(--on-ink); border-bottom: 1px solid var(--ink); }
.labtn.primary:hover { background: var(--ink-hover); border-color: var(--ink-hover); color: var(--on-ink); }

/* External link affordance: any text link that opens a new tab carries
   class="ext" and gets the arrow icon via CSS (no markup per link). */
a.ext::after {
  content: "";
  display: inline-block;
  width: 0.85em;
  height: 0.85em;
  background-color: currentColor;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 16 16%22%3E%3Cpath d=%22M8.636 3.5a.5.5 0 0 0-.5-.5H1.5A1.5 1.5 0 0 0 0 4.5v10A1.5 1.5 0 0 0 1.5 16h10a1.5 1.5 0 0 0 1.5-1.5V7.864a.5.5 0 0 0-1 0V14.5a.5.5 0 0 1-.5.5h-10a.5.5 0 0 1-.5-.5v-10a.5.5 0 0 1 .5-.5h6.636a.5.5 0 0 0 .5-.5%22/%3E%3Cpath d=%22M16 .5a.5.5 0 0 0-.5-.5h-5a.5.5 0 0 0 0 1h3.793L6.146 9.146a.5.5 0 1 0 .708.708L15 1.707V5.5a.5.5 0 0 0 1 0z%22/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 16 16%22%3E%3Cpath d=%22M8.636 3.5a.5.5 0 0 0-.5-.5H1.5A1.5 1.5 0 0 0 0 4.5v10A1.5 1.5 0 0 0 1.5 16h10a1.5 1.5 0 0 0 1.5-1.5V7.864a.5.5 0 0 0-1 0V14.5a.5.5 0 0 1-.5.5h-10a.5.5 0 0 1-.5-.5v-10a.5.5 0 0 1 .5-.5h6.636a.5.5 0 0 0 .5-.5%22/%3E%3Cpath d=%22M16 .5a.5.5 0 0 0-.5-.5h-5a.5.5 0 0 0 0 1h3.793L6.146 9.146a.5.5 0 1 0 .708.708L15 1.707V5.5a.5.5 0 0 0 1 0z%22/%3E%3C/svg%3E");
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  margin-left: 0.35em;
  vertical-align: -0.05em;
  opacity: 0.75;
}

/* ---------- Shelf ---------- */

.lshelf { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 1rem 0 2rem; }
@media (max-width: 575.98px) { .lshelf { grid-template-columns: repeat(2, 1fr); } }

.lshelf-item { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 0.75rem; text-align: center; }
.lshelf-item a { border-bottom: 0; }
.lshelf-item .shelf-num {
  display: block;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-top: 0.4rem;
}
.lshelf-item .shelf-name { display: block; font-size: 0.8125rem; font-weight: 600; color: var(--ink); margin-top: 0.15rem; }
.lshelf-item .shelf-sub { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 0.15rem; }

/* ---------- Feedback ---------- */

.feedback {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.25rem 1.25rem 1.35rem;
  margin: 1rem 0 0;
}
.feedback h2 { margin-top: 0; }
.feedback p { max-width: 68ch; }

/* ---------- Footer ---------- */

.site-footer { border-top: 1px solid var(--line); margin-top: 2.5rem; padding: 1.25rem 0 1.75rem; background: var(--surface); font-size: 0.9375rem; color: var(--body); }
.site-footer p { margin: 0 0 0.35rem; }
.site-footer .footer-links { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; align-items: center; margin-top: 0.5rem; }
.site-footer .footer-links a { color: var(--muted); border-bottom: 0; }
.site-footer .footer-links a:hover { color: var(--accent); }
.site-footer .footer-icons { display: flex; gap: 0.3rem; margin-top: 0.75rem; }

/* ---------- Consent banner ---------- */

.consent {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: 1030;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 0.85rem 1.25rem;
  background: var(--surface);
  border-top: 1px solid var(--line);
  box-shadow: 0 -4px 16px var(--shadow-sm);
  font-size: 0.875rem;
  color: var(--body);
}

.consent:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.consent-text { flex: 1 1 24rem; margin: 0; max-width: none; }
.consent-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-left: auto; }

.consent-btn {
  font: inherit;
  font-weight: 600;
  line-height: 1.3;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}
.consent-btn:hover { background: var(--line-soft); }
.consent-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.consent-btn-primary { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }
.consent-btn-primary:hover { background: var(--ink-hover); color: var(--on-ink); }

@media (max-width: 575px) {
  .consent { padding: 0.9rem 1rem; }
  .consent-actions { margin-left: 0; width: 100%; }
  .consent-btn { flex: 1 1 auto; }
}

/* ---------- Print ---------- */

@media print {
  .site-header, .site-footer, .filterbar, .consent, .lactions { display: none !important; }
  .lcard { break-inside: avoid; border-color: var(--line); }
}