/* ══════════════════════════════════════
   SiD Learning Platform Styles
   Extends the base ThinkSiD design system
   ══════════════════════════════════════ */

/* ── LAYOUT: Two-column (sidebar + content) ── */

.learn-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 60vh;
}

.learn-main {
  padding: 2.5rem 3rem 4rem;
  max-width: 860px;
  min-width: 0;
}

.learn-sidebar {
  border-right: 1px solid var(--earth-border);
  background: var(--earth-ivory);
  padding: 2rem 0;
}

.learn-sidebar-inner {
  position: sticky;
  top: 88px;
  padding: 0 1rem;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.learn-sidebar-header {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--magenta);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--earth-border);
}

.learn-sidebar-header a {
  color: var(--magenta);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.learn-sidebar-header a:hover {
  text-decoration: underline;
}

.learn-sidebar-toggle {
  display: none;
  align-items: center;
  gap: 0.4rem;
  background: var(--earth-linen);
  border: 1px solid var(--earth-border);
  border-radius: var(--radius);
  padding: 0.4rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--earth-muted);
  cursor: pointer;
  margin-bottom: 1rem;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.learn-sidebar-toggle:hover {
  color: var(--earth-dark);
  border-color: var(--earth-dark);
}


/* ── NAV PROGRESS ── */

.learn-nav-progress {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--earth-border);
}

.learn-nav-progress-track {
  height: 4px;
  background: var(--earth-border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.35rem;
}

.learn-nav-progress-fill {
  height: 100%;
  background: var(--magenta);
  border-radius: 2px;
  transition: width 0.5s ease;
  width: 0%;
}

.learn-nav-progress-text {
  font-size: 0.7rem;
  color: var(--earth-muted);
}


/* ── NAV GROUPS ── */

.learn-nav-group {
  margin-bottom: 0.75rem;
}

.learn-nav-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--earth-stone);
  padding: 0.4rem 0.5rem 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.learn-nav-item {
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--earth-body);
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  text-decoration: none;
  line-height: 1.35;
  transition: all 0.15s ease;
}

.learn-nav-item:hover {
  color: var(--magenta);
  background: var(--earth-linen);
  text-decoration: none;
}

.learn-nav-item.active {
  color: var(--magenta);
  background: var(--magenta-pale);
  font-weight: 600;
}

.learn-nav-check {
  display: inline-block;
  width: 14px;
  height: 14px;
  min-width: 14px;
  border: 1.5px solid var(--earth-border);
  border-radius: 50%;
  margin-top: 2px;
  position: relative;
  transition: all 0.2s ease;
}

.learn-nav-check.done {
  background: var(--magenta);
  border-color: var(--magenta);
}

.learn-nav-check.done::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 4px;
  width: 4px;
  height: 7px;
  border: solid white;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

.learn-nav-title {
  flex: 1;
}


/* ── BREADCRUMB ── */

.learn-breadcrumb {
  font-size: 0.78rem;
  color: var(--earth-stone);
  margin-bottom: 1.5rem;
}

.learn-breadcrumb a {
  color: var(--earth-muted);
  text-decoration: none;
}

.learn-breadcrumb a:hover {
  color: var(--magenta);
}

.learn-breadcrumb span {
  margin: 0 0.3rem;
}


/* ── LAYER BADGES ── */

.learn-layer-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  line-height: 1;
}

.learn-layer-foundation {
  background: #E8F5F3;
  color: #2A8B7A;
}

.learn-layer-theory {
  background: var(--magenta-pale);
  color: var(--magenta);
}

.learn-layer-method {
  background: #E8EEF5;
  color: #1B4F8A;
}

.learn-layer-tools {
  background: #F5F0EB;
  color: var(--earth-stone);
}

.learn-layer-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 0.4rem;
  flex-shrink: 0;
}

.learn-layer-dot.learn-layer-foundation { background: #2A8B7A; }
.learn-layer-dot.learn-layer-theory { background: var(--magenta); }
.learn-layer-dot.learn-layer-method { background: #1B4F8A; }
.learn-layer-dot.learn-layer-tools { background: var(--earth-stone); }


/* ── UNIT TITLE ── */

.learn-unit-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: var(--earth-dark);
  margin: 0.75rem 0 0.5rem;
}


/* ── TAGS ── */

.learn-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.learn-tag {
  font-size: 0.75rem;
  color: var(--earth-stone);
  background: var(--earth-linen);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}


/* ── VIDEO SECTION ── */

.learn-video-section {
  margin: 2rem 0 2.5rem;
}


/* ── BODY CONTENT ── */

.learn-body {
  margin-top: 2rem;
}

.learn-body-block + .learn-body-block {
  margin-top: 0;
}

.learn-body h2 {
  font-size: 1.5rem;
  color: var(--earth-dark);
  margin: 3rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--earth-border);
}

.learn-body h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.learn-body h3 {
  font-size: 1.15rem;
  color: var(--earth-dark);
  margin: 2rem 0 0.75rem;
}

.learn-body p {
  color: var(--earth-body);
  line-height: 1.85;
  margin-bottom: 1.2em;
}

.learn-body ul,
.learn-body ol {
  margin: 0 0 1.2em 1.5em;
  color: var(--earth-body);
}

.learn-body li {
  margin-bottom: 0.5em;
  line-height: 1.7;
}

.learn-body blockquote {
  border-left: 3px solid var(--magenta);
  margin: 2rem 0;
  padding: 1.2rem 1.5rem;
  background: var(--magenta-pale);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--earth-body);
  font-size: 1.05rem;
  line-height: 1.65;
}

.learn-body-img {
  max-width: 100%;
  margin: 2rem 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.learn-embed {
  margin: 2rem 0;
}

.learn-embed iframe {
  max-width: 100%;
  border-radius: var(--radius);
}


/* ── EXERCISE ── */

.learn-exercise {
  margin: 3rem 0 2rem;
  border: 1px solid var(--earth-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.learn-exercise-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--magenta-pale);
  border-bottom: 1px solid var(--earth-border);
}

.learn-exercise-header h2 {
  font-size: 1rem;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--magenta);
  margin: 0;
  border: none;
  padding: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.learn-exercise-body {
  padding: 1.5rem;
}

.learn-exercise-body p {
  color: var(--earth-body);
  line-height: 1.8;
  margin-bottom: 1em;
}

.learn-exercise-body ul,
.learn-exercise-body ol {
  margin: 0 0 1em 1.5em;
}

.learn-exercise-body li {
  margin-bottom: 0.4em;
  line-height: 1.7;
}


/* ── DONOR STRIP ── */

.learn-donor-strip {
  background: var(--earth-linen);
  border: 1px solid var(--earth-border);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  margin-top: 2.5rem;
  text-align: center;
}

.learn-donor-strip p {
  font-size: 0.82rem;
  color: var(--earth-muted);
  margin: 0;
}

.learn-donor-strip a {
  color: var(--magenta);
  text-decoration: none;
  font-weight: 600;
}

.learn-donor-strip a:hover {
  text-decoration: underline;
}


/* ── PREV/NEXT NAVIGATION ── */

.learn-prevnext {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--earth-border);
}

.learn-prevnext-link {
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--earth-border);
  text-decoration: none;
  max-width: 48%;
  transition: all 0.3s ease;
}

.learn-prevnext-link:hover {
  border-color: var(--magenta);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.learn-prev { text-align: left; }
.learn-next { text-align: right; margin-left: auto; }

.learn-prevnext-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--magenta);
  display: block;
  margin-bottom: 4px;
}

.learn-prevnext-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--earth-dark);
  line-height: 1.3;
}


/* ── UNIT CARD ── */

.learn-unit-card {
  background: white;
  border: 1px solid var(--earth-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), box-shadow 0.4s ease;
}

.learn-unit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.learn-unit-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.learn-unit-card-video {
  color: var(--earth-stone);
}

.learn-unit-card h3 {
  font-size: 1.02rem;
  color: var(--earth-dark);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.learn-unit-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 0.75rem;
}

.learn-unit-card-tags span {
  font-size: 0.7rem;
  color: var(--earth-stone);
  background: var(--earth-linen);
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
}

.learn-unit-card-cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--magenta);
  margin-top: auto;
  padding-top: 0.5rem;
}


/* ── DONOR REMINDER ── */

.donor-reminder {
  background: var(--earth-linen);
  border-top: 1px solid var(--earth-border);
  padding: 0.75rem 1.5rem;
  margin-top: 3rem;
}

.donor-reminder-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max-content);
  margin: 0 auto;
}

.donor-reminder-text {
  font-size: 0.82rem;
  color: var(--earth-muted);
}

.donor-reminder-text a {
  color: var(--earth-body);
  text-decoration: underline;
}

.donor-reminder-text a:hover {
  color: var(--magenta);
}

.donor-reminder-cta {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--magenta);
  text-decoration: none;
  white-space: nowrap;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--magenta);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.donor-reminder-cta:hover {
  background: var(--magenta);
  color: white;
  text-decoration: none;
}


/* ── SEARCH BAR ── */

.learn-search-form {
  max-width: 480px;
  margin: 0 auto;
}

.learn-search-wrapper {
  display: flex;
  align-items: center;
  background: white;
  border: 1px solid var(--earth-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.learn-search-wrapper:focus-within {
  border-color: var(--magenta);
  box-shadow: 0 0 0 3px rgba(230, 36, 122, 0.1);
}

.learn-search-icon {
  margin-left: 0.75rem;
  color: var(--earth-muted);
  flex-shrink: 0;
}

.learn-search-input {
  flex: 1;
  border: none;
  outline: none;
  padding: 0.65rem 0.75rem;
  font-size: 0.92rem;
  font-family: var(--font-sans);
  color: var(--earth-text);
  background: transparent;
}

.learn-search-input::placeholder {
  color: var(--earth-light);
}

.learn-search-btn {
  background: var(--magenta);
  color: white;
  border: none;
  padding: 0.65rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.learn-search-btn:hover {
  background: var(--magenta-dark);
}


/* ── PATH SIDEBAR PROGRESS ── */

.learn-path-sidebar-progress {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--earth-border);
}

.learn-path-sidebar-track {
  height: 4px;
  background: var(--earth-border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.learn-path-sidebar-fill {
  height: 100%;
  background: var(--magenta);
  border-radius: 2px;
  transition: width 0.5s ease;
}

.learn-path-sidebar-text {
  font-size: 0.75rem;
  color: var(--earth-muted);
  margin-bottom: 0.75rem;
}

.learn-path-sidebar-units {
  display: flex;
  flex-direction: column;
  gap: 2px;
}


/* ══════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════ */

@media (max-width: 1024px) {
  .learn-layout {
    grid-template-columns: 1fr;
  }

  .learn-sidebar {
    border-right: none;
    border-top: 1px solid var(--earth-border);
    padding: 1.5rem 0;
    display: none;
  }

  .learn-sidebar.open {
    display: block;
    position: fixed;
    top: 72px;
    left: 0;
    bottom: 0;
    width: 280px;
    z-index: 90;
    box-shadow: 4px 0 20px rgba(0,0,0,0.1);
    overflow-y: auto;
  }

  .learn-sidebar-inner {
    position: static;
    max-height: none;
  }

  .learn-sidebar-toggle {
    display: flex;
  }

  .learn-main {
    padding: 1.5rem 2rem 3rem;
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .learn-main {
    padding: 1.5rem;
  }

  .learn-prevnext {
    flex-direction: column;
  }

  .learn-prevnext-link {
    max-width: 100%;
  }

  .donor-reminder-inner {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .learn-search-wrapper {
    flex-direction: column;
    align-items: stretch;
  }

  .learn-search-icon {
    display: none;
  }

  .learn-search-input {
    padding: 0.75rem;
  }

  .learn-search-btn {
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  .learn-unit-title {
    font-size: 1.6rem;
  }
}