.page-content {
  --section-gap: var(--space-8);
}

.page-content {
  padding: var(--space-8) 0 var(--space-12);
}

.breadcrumb {
  padding: var(--space-4) 0;
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

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

.breadcrumb a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

.breadcrumb-sep {
  color: var(--color-text-muted);
  opacity: 0.7;
  user-select: none;
}

.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--section-gap);
  align-items: start;
}

.tree-plan-block {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.tree-plan-block:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.tree-plan-block h2 {
  color: var(--color-primary);
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 700;
  margin: 0 0 var(--space-4);
}

.tree-plan-block img {
  max-width: 100%;
  height: auto;
  margin: 0 auto var(--space-5);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.tree-plan-block .btn-download {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-base);
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
  border: none;
}

.tree-plan-block .btn-download:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
  color: white;
  transform: translateY(-2px);
}

.intro-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--section-gap);
  align-items: center;
  padding: var(--section-gap) 0;
}

.intro-text h2 {
  color: var(--color-primary);
  margin: 0 0 var(--space-3);
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 700;
}

.intro-text p {
  margin: 0;
  color: var(--color-text-muted);
  line-height: 1.75;
  font-size: var(--text-base);
}

.intro-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-border);
  min-height: 200px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.intro-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pdf-section {
  padding: var(--section-gap) 0;
}

.pdf-section h2 {
  color: var(--color-primary);
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 700;
  margin: 0 0 var(--space-4);
}

.pdf-viewer {
  width: 100%;
  min-height: 600px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.pdf-fallback {
  padding: var(--space-6);
  text-align: center;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-border);
}

.pdf-fallback a {
  display: inline-block;
  margin-top: var(--space-2);
  font-weight: 500;
}

.about-section {
  padding: var(--section-gap) 0;
}

.about-section-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  text-align: center;
}

.about-section-intro {
  margin: 0 0 var(--space-8);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 36rem;
  margin-inline: auto;
  line-height: var(--leading-relaxed);
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.about-card {
  position: relative;
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

.about-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.about-card-accent {
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-accent) 0%, rgba(201, 162, 39, 0.5) 100%);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(159, 29, 50, 0.28);
  border-color: rgba(255, 255, 255, 0.12);
}

.about-card:hover .about-card-icon {
  transform: scale(1.08);
}

.about-card-badge {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
}

.about-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  margin-bottom: var(--space-4);
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  color: white;
  transition: transform var(--transition);
}

.about-card-icon .material-symbols-outlined {
  font-size: 1.625rem;
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
}

.about-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.25rem;
  font-weight: 700;
}

.about-card p {
  margin: 0;
  opacity: 0.95;
  line-height: 1.75;
  font-size: 0.9375rem;
}

[data-theme="dark"] .about-card {
  border-color: rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-card);
}

[data-theme="dark"] .about-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.hero-image {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  display: block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.hero-placeholder {
  width: 100%;
  height: 320px;
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
}

.hero-about {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.hero-about-img {
  width: 100%;
  height: clamp(240px, 35vw, 420px);
  object-fit: cover;
  object-position: center;
  display: block;
  vertical-align: middle;
}

.hero-about-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 15, 15, 0.25) 0%, rgba(15, 15, 15, 0.5) 100%);
  pointer-events: none;
}

[data-theme="dark"] .hero-about-overlay {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.55) 100%);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  padding: var(--section-gap) 0;
}

.course-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.course-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.course-card h3 {
  margin: 0 0 var(--space-3);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
}

.course-card-icons {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.course-card-icons span {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.library-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-8);
  padding: var(--section-gap) 0;
  align-items: start;
}

.library-sidebar {
  position: sticky;
  top: calc(var(--header-height, 140px) + var(--space-4));
}

.library-sidebar h3 {
  margin: 0 0 var(--space-3);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.library-sidebar nav {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.library-sidebar a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: background var(--transition), color var(--transition);
}

.library-sidebar a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.library-course-block {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
}

.library-course-block:last-child {
  border-bottom: none;
}

.library-course-block h2 {
  margin: 0 0 var(--space-2);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.library-course-block p {
  margin: 0 0 var(--space-3);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.btn-share {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.btn-share:hover {
  background: var(--color-primary-dark);
  color: white;
  text-decoration: none;
  transform: translateY(-2px);
}

.video-section h2 {
  color: var(--color-primary);
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 700;
  margin: 0 0 var(--space-4);
  text-align: center;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: #000;
  box-shadow: var(--shadow-md);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
}