.htb-archive-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4.5rem, 8vw, 7rem) 0 2.5rem;
}

.htb-archive-hero::before {
  content: "";
  position: absolute;
  inset: -10rem auto auto -12rem;
  width: 34rem;
  height: 34rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(159,239,0,.14), transparent 68%);
  pointer-events: none;
}

.htb-archive-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .72fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}

.htb-archive-hero h1 {
  margin: 0;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: .98;
  letter-spacing: -.055em;
}

.htb-archive-hero h1 span { color: #9fef00; }

.htb-archive-hero p {
  max-width: 760px;
  margin: 1.4rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.24rem);
}

.htb-archive-panel {
  padding: 1.6rem;
  border: 1px solid rgba(159,239,0,.3);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(145deg, rgba(159,239,0,.08), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
}

.htb-archive-stat {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--border);
}

.htb-archive-stat:last-child { border-bottom: 0; }
.htb-archive-stat span { color: var(--muted); }
.htb-archive-stat strong { color: #9fef00; }

.htb-notice {
  margin: 0;
  padding: 1.2rem 1.35rem;
  border: 1px solid rgba(159,239,0,.28);
  border-radius: var(--radius);
  background: rgba(159,239,0,.055);
  color: #d8e4c8;
}

.htb-notice code { color: #9fef00; }

.htb-library-toolbar {
  position: sticky;
  top: 1rem;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin: 0 0 1.5rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(8,11,16,.92);
  backdrop-filter: blur(18px);
  box-shadow: 0 14px 35px rgba(0,0,0,.24);
}

.htb-search-wrap {
  position: relative;
}

.htb-search-wrap i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: #9fef00;
}

.htb-library-search {
  width: 100%;
  min-height: 48px;
  padding: .8rem 1rem .8rem 2.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #090d13;
  color: var(--text);
  font: inherit;
}

.htb-library-search:focus {
  outline: 2px solid rgba(159,239,0,.4);
  border-color: #9fef00;
}

.htb-result-count {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: .82rem;
  white-space: nowrap;
}

.htb-machine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
}

.htb-machine-card {
  min-width: 0;
}

.htb-machine-card a {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  align-items: center;
  gap: .9rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(255,255,255,.045), rgba(255,255,255,.014));
  color: var(--text);
  text-align: center;
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.htb-machine-card a:hover,
.htb-machine-card a:focus-visible {
  transform: translateY(-5px);
  border-color: rgba(159,239,0,.62);
  box-shadow: 0 20px 40px rgba(0,0,0,.32);
}

.htb-machine-card img {
  width: 96px;
  height: 96px;
  border-radius: 14px;
  object-fit: cover;
  background: #0b1016;
}

.htb-machine-card span {
  overflow-wrap: anywhere;
  font-weight: 700;
}

.htb-machine-card[hidden] { display: none; }

.htb-section-heading {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: end;
  margin-bottom: 1.5rem;
}

.htb-section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -.04em;
}

.htb-section-heading p {
  max-width: 540px;
  margin: 0;
  color: var(--muted);
}

.htb-challenge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.htb-challenge-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,.025);
}

.htb-challenge-card h3 {
  margin: 0 0 .85rem;
  color: #9fef00;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.htb-challenge-card ul {
  display: grid;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.htb-challenge-card li {
  padding-bottom: .45rem;
  border-bottom: 1px solid rgba(255,255,255,.055);
  color: var(--muted);
}

.htb-challenge-card li:last-child { border-bottom: 0; }
.htb-challenge-card a { color: var(--text); }
.htb-challenge-card a:hover { color: #9fef00; }

.htb-empty-state {
  display: none;
  margin: 1.5rem 0 0;
  padding: 1.25rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  text-align: center;
}

.htb-empty-state.is-visible { display: block; }

@media (max-width: 900px) {
  .htb-archive-grid { grid-template-columns: 1fr; }
  .htb-section-heading { align-items: start; flex-direction: column; }
}

@media (max-width: 640px) {
  .htb-library-toolbar { grid-template-columns: 1fr; }
  .htb-result-count { white-space: normal; }
  .htb-machine-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}