:root {
  --brand-green: #00C853;
  --brand-green-dim: #00A844;
  --brand-gray: #D9D9D9;
  --brand-muted: #9CA3AF;
  --brand-black: #000000;
  --brand-panel: #0A0A0A;
  --brand-card: #111111;
  --brand-line: #222222;
}

.site-header {
  border-bottom: 1px solid var(--brand-line);
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
}

.logo-img {
  height: 42px;
  width: auto;
  display: block;
  object-fit: contain;
}
.logo-img-lg {
  height: 64px;
}
@media (min-width: 768px) {
  .logo-img { height: 52px; }
  .logo-img-lg { height: 80px; }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--brand-line);
  padding: .4rem .95rem;
  color: var(--brand-muted);
  font-weight: 600;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.nav-link:hover {
  border-color: rgba(0, 200, 83, .45);
  color: #fff;
}
.nav-link-active {
  border-color: rgba(0, 200, 83, .55);
  background: rgba(0, 200, 83, .12);
  color: var(--brand-green);
}
.nav-logout {
  border-color: transparent;
  color: var(--brand-muted);
}
.nav-logout:hover {
  color: #fff;
  border-color: var(--brand-line);
}

.hero-band {
  padding: 1.5rem 0 .25rem;
}

.field-input {
  width: 100%;
  border-radius: .85rem;
  border: 1px solid var(--brand-line);
  background: var(--brand-panel);
  padding: .7rem 1rem;
  font-size: .875rem;
  color: #fff;
  outline: none;
}
.field-input:focus {
  border-color: rgba(0, 200, 83, .55);
  box-shadow: 0 0 0 3px rgba(0, 200, 83, .18);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: .85rem;
  background: var(--brand-green);
  padding: .7rem 1.15rem;
  font-size: .875rem;
  font-weight: 800;
  color: #000;
  transition: background .15s ease, transform .15s ease;
}
.btn-primary:hover {
  background: var(--brand-green-dim);
}

.cat-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid var(--brand-line);
  background: var(--brand-card);
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.cat-card:hover {
  border-color: rgba(0, 200, 83, .45);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 200, 83, .08);
}
.cat-card-active {
  border-color: rgba(0, 200, 83, .7);
  box-shadow: 0 0 0 1px rgba(0, 200, 83, .35);
}
.cat-card-cover {
  aspect-ratio: 16 / 9;
  width: 100%;
  object-fit: cover;
  background: #0a0a0a;
}
.cat-card-cover-fallback {
  background:
    linear-gradient(135deg, rgba(0, 200, 83, .35), transparent 55%),
    linear-gradient(180deg, #151515, #050505);
}
.cat-card-body {
  padding: .85rem 1rem 1rem;
}

.card-course {
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid var(--brand-line);
  background: var(--brand-card);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.card-course:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 200, 83, .4);
  box-shadow: 0 16px 36px rgba(0, 0, 0, .45);
}
.cover {
  aspect-ratio: 16 / 9;
  width: 100%;
  object-fit: cover;
  background: #0a0a0a;
}
.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--brand-line);
  background: rgba(255, 255, 255, .03);
  padding: .15rem .65rem;
  font-size: 11px;
  color: var(--brand-muted);
}
.pill-green {
  border-color: rgba(0, 200, 83, .35);
  background: rgba(0, 200, 83, .1);
  color: var(--brand-green);
}
.lesson-row:hover {
  background: rgba(0, 200, 83, .06);
}

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

.header-search {
  position: relative;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.header-search-input {
  width: 100%;
  border-radius: 999px;
  border: 1px solid var(--brand-line);
  background: var(--brand-panel);
  color: #fff;
  padding: .65rem 1rem;
  font-size: .875rem;
  outline: none;
}
.header-search-input:focus {
  border-color: rgba(0, 200, 83, .55);
  box-shadow: 0 0 0 3px rgba(0, 200, 83, .16);
}
.header-search-btn {
  border-radius: 999px;
  border: 0;
  background: var(--brand-green);
  color: #000;
  font-weight: 800;
  font-size: .8rem;
  padding: .65rem 1rem;
  white-space: nowrap;
}
.header-search-btn:hover { background: var(--brand-green-dim); }

.search-panel {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid var(--brand-line);
  background: rgba(17, 17, 17, .85);
}
.search-panel-main {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.search-panel-input {
  font-size: 1rem !important;
  padding: .9rem 1.1rem !important;
}
.search-panel-filters {
  display: grid;
  grid-template-columns: 1fr;
  gap: .6rem;
}
@media (min-width: 768px) {
  .search-panel-main {
    flex-direction: row;
    align-items: center;
  }
  .search-panel-filters {
    grid-template-columns: 1fr 1fr;
  }
}

.lesson-result {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .9rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.05);
  background: rgba(0,0,0,.25);
  transition: background .15s ease;
}
.lesson-result:last-child { border-bottom: 0; }
.lesson-result:hover { background: rgba(0, 200, 83, .07); }

.path-tree {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem .45rem;
  padding: .85rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--brand-line);
  background: rgba(17, 17, 17, .9);
  font-size: .8rem;
  line-height: 1.35;
}
.path-tree-item {
  max-width: 100%;
  overflow-wrap: anywhere;
}
.path-tree-link {
  color: var(--brand-muted);
  font-weight: 600;
}
.path-tree-link:hover {
  color: var(--brand-green);
}
.path-tree-current {
  color: var(--brand-green);
  font-weight: 700;
}
.path-tree-sep {
  color: #444;
  user-select: none;
}

.nav-lesson-btn {
  display: inline-flex;
  align-items: center;
  max-width: min(100%, 280px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border-radius: .85rem;
  border: 1px solid var(--brand-line);
  background: var(--brand-card);
  padding: .55rem .9rem;
  font-size: .8rem;
  font-weight: 700;
  color: var(--brand-gray);
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}
.nav-lesson-btn:hover {
  border-color: rgba(0, 200, 83, .45);
  color: #fff;
}
.nav-lesson-btn-primary {
  border-color: rgba(0, 200, 83, .45);
  background: rgba(0, 200, 83, .12);
  color: var(--brand-green);
}
.nav-lesson-btn-primary:hover {
  background: rgba(0, 200, 83, .2);
  color: #fff;
}
.nav-lesson-btn-disabled {
  opacity: .35;
  pointer-events: none;
}