/* ==============================================
   NIXSEC LABS — Experience / Credentials Page
============================================== */

/* CTA Band (shared with about/methodology) */
.cta-band {
  background: var(--bg-card);
  border-top: 1px solid var(--bg-border);
  border-bottom: 1px solid var(--bg-border);
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--lime), transparent);
}
.cta-band-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.cta-band-eyebrow {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.cta-band-title {
  font-family: var(--mono);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 0.5rem;
}
.cta-band-sub { font-size: 0.84rem; color: var(--text-dim); }
.cta-band-btn {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  padding: 0.9rem 2rem;
  background: var(--lime);
  color: var(--nav-cta-text);
  text-decoration: none;
  text-transform: uppercase;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.cta-band-btn:hover {
  background: #6affaa;
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(50,255,126,0.35);
}

/* =============================================
   PAGE HERO
============================================= */
#page-hero {
  padding: 9rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--bg-border);
}

.hex-bg {
  position: absolute;
  inset: 0;
  font-family: var(--mono);
  font-size: 0.6rem;
  line-height: 1.4;
  color: var(--hex-color);
  word-break: break-all;
  overflow: hidden;
  user-select: none;
  pointer-events: none;
  padding: 1rem;
  letter-spacing: 0.05em;
}

.page-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--red);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.page-title {
  font-family: var(--mono);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 1.2rem;
  letter-spacing: -0.01em;
}
.page-title .accent-lime { color: var(--lime); }

.page-sub {
  max-width: 640px;
  margin: 0 auto;
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.75;
}

/* =============================================
   CREDENTIAL SUMMARY BAR
============================================= */
.cred-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--bg-border);
}
.cred-bar-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0;
}
@media (max-width: 640px) {
  .cred-bar-inner { grid-template-columns: repeat(2, 1fr); }
}

.cred-stat {
  padding: 2rem 1.5rem;
  text-align: center;
  border-right: 1px solid var(--bg-border);
  position: relative;
}
.cred-stat:last-child { border-right: none; }
.cred-stat::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.3s;
}
.cred-stat:hover::after { opacity: 1; }
.cred-stat:nth-child(1)::after { background: var(--red); }
.cred-stat:nth-child(2)::after { background: var(--blue); }
.cred-stat:nth-child(3)::after { background: var(--lime); }
.cred-stat:nth-child(4)::after { background: var(--amber); }

.cred-stat-num {
  font-family: var(--mono);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.4rem;
}
.cred-stat:nth-child(1) .cred-stat-num { color: var(--red); }
.cred-stat:nth-child(2) .cred-stat-num { color: var(--blue); }
.cred-stat:nth-child(3) .cred-stat-num { color: var(--lime); }
.cred-stat:nth-child(4) .cred-stat-num { color: var(--amber); }

.cred-stat-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* =============================================
   FILTER BAR
============================================= */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.filter-btn {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  padding: 0.4rem 0.9rem;
  background: transparent;
  border: 1px solid var(--bg-border);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover,
.filter-btn.active           { border-color: var(--lime);  color: var(--lime);  background: rgba(50,255,126,0.05); }
.filter-btn[data-filter="red"].active   { border-color: var(--red);   color: var(--red);   background: rgba(255,62,62,0.05); }
.filter-btn[data-filter="blue"].active  { border-color: var(--blue);  color: var(--blue);  background: rgba(24,220,255,0.05); }
.filter-btn[data-filter="amber"].active { border-color: var(--amber); color: var(--amber); background: rgba(255,165,0,0.05); }
.filter-btn[data-filter="purple"].active { border-color: #b44fff; color: #b44fff; background: rgba(180,79,255,0.05); }

/* =============================================
   MAIN LAYOUT
============================================= */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
}

/* Category section header */
.cat-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.8rem;
  margin-top: 4rem;
}
.cat-header:first-child { margin-top: 0; }
.cat-line { flex: 1; height: 1px; background: var(--bg-border); }
.cat-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border: 1px solid;
  white-space: nowrap;
}
.cat-label.red    { color: var(--red);   border-color: rgba(255,62,62,0.4);  background: rgba(255,62,62,0.05); }
.cat-label.blue   { color: var(--blue);  border-color: rgba(24,220,255,0.4); background: rgba(24,220,255,0.05); }
.cat-label.lime   { color: var(--lime);  border-color: rgba(50,255,126,0.4); background: rgba(50,255,126,0.05); }
.cat-label.amber  { color: var(--amber); border-color: rgba(255,165,0,0.4);  background: rgba(255,165,0,0.05); }
.cat-label.purple { color: #b44fff;      border-color: rgba(180,79,255,0.4); background: rgba(180,79,255,0.05); }
.cat-label.dim    { color: var(--text-dim); border-color: var(--bg-border);  background: transparent; }

/* =============================================
   CERT CARDS GRID
============================================= */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
@media (max-width: 480px) { .cert-grid { grid-template-columns: 1fr; } }

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s;
}
.cert-card:hover { transform: translateY(-3px); }

.cert-card.red:hover    { box-shadow: 0 8px 28px rgba(255,62,62,0.12); }
.cert-card.blue:hover   { box-shadow: 0 8px 28px rgba(24,220,255,0.12); }
.cert-card.lime:hover   { box-shadow: 0 8px 28px rgba(50,255,126,0.12); }
.cert-card.amber:hover  { box-shadow: 0 8px 28px rgba(255,165,0,0.12); }
.cert-card.purple:hover { box-shadow: 0 8px 28px rgba(180,79,255,0.12); }

.cert-card-accent { height: 2px; }
.cert-card.red    .cert-card-accent { background: var(--red); }
.cert-card.blue   .cert-card-accent { background: var(--blue); }
.cert-card.lime   .cert-card-accent { background: var(--lime); }
.cert-card.amber  .cert-card-accent { background: var(--amber); }
.cert-card.purple .cert-card-accent { background: #b44fff; }

.cert-card-body { padding: 1.6rem 1.8rem; display: flex; flex-direction: column; flex: 1; gap: 0.9rem; }

.cert-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.cert-acronym {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
}
.cert-card.red    .cert-acronym { color: var(--red); }
.cert-card.blue   .cert-acronym { color: var(--blue); }
.cert-card.lime   .cert-acronym { color: var(--lime); }
.cert-card.amber  .cert-acronym { color: var(--amber); }
.cert-card.purple .cert-acronym { color: #b44fff; }

.cert-issuer-badge {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.18rem 0.5rem;
  border: 1px solid var(--bg-border);
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: flex-start;
}

.cert-full-name {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-bright);
  line-height: 1.35;
}

.cert-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.75;
  flex: 1;
}

.cert-matters {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.75rem 0.9rem;
  border-left: 2px solid;
  background: var(--bg-card2);
  font-size: 0.78rem;
  line-height: 1.6;
}
.cert-card.red    .cert-matters { border-color: var(--red);   color: var(--text-dim); }
.cert-card.blue   .cert-matters { border-color: var(--blue);  color: var(--text-dim); }
.cert-card.lime   .cert-matters { border-color: var(--lime);  color: var(--text-dim); }
.cert-card.amber  .cert-matters { border-color: var(--amber); color: var(--text-dim); }
.cert-card.purple .cert-matters { border-color: #b44fff;      color: var(--text-dim); }

.cert-matters-label {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  flex-shrink: 0;
  margin-top: 0.05rem;
}
.cert-card.red    .cert-matters-label { color: var(--red); }
.cert-card.blue   .cert-matters-label { color: var(--blue); }
.cert-card.lime   .cert-matters-label { color: var(--lime); }
.cert-card.amber  .cert-matters-label { color: var(--amber); }
.cert-card.purple .cert-matters-label { color: #b44fff; }

.cert-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  border-top: 1px solid var(--bg-border);
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cert-operators {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.cert-op-label {
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.cert-op-dot {
  width: 20px; height: 20px;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
}
.cert-card.red    .cert-op-dot { background: rgba(255,62,62,0.1);   border: 1px solid rgba(255,62,62,0.3);   color: var(--red); }
.cert-card.blue   .cert-op-dot { background: rgba(24,220,255,0.1);  border: 1px solid rgba(24,220,255,0.3);  color: var(--blue); }
.cert-card.lime   .cert-op-dot { background: rgba(50,255,126,0.1);  border: 1px solid rgba(50,255,126,0.3);  color: var(--lime); }
.cert-card.amber  .cert-op-dot { background: rgba(255,165,0,0.1);   border: 1px solid rgba(255,165,0,0.3);   color: var(--amber); }
.cert-card.purple .cert-op-dot { background: rgba(180,79,255,0.1);  border: 1px solid rgba(180,79,255,0.3);  color: #b44fff; }

.cert-difficulty {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.cert-difficulty span {
  font-weight: 700;
}
.cert-card.red    .cert-difficulty span { color: var(--red); }
.cert-card.blue   .cert-difficulty span { color: var(--blue); }
.cert-card.lime   .cert-difficulty span { color: var(--lime); }
.cert-card.amber  .cert-difficulty span { color: var(--amber); }
.cert-card.purple .cert-difficulty span { color: #b44fff; }

/* Hidden state for filter */
.cert-card.hidden { display: none; }

/* =============================================
   FOOTER
============================================= */
footer {
  padding: 3rem 2rem;
  border-top: 1px solid var(--bg-border);
  text-align: center;
}
.footer-logo { font-family: var(--mono); font-size: 1.3rem; font-weight: 700; color: var(--lime); margin-bottom: 0.4rem; letter-spacing: 0.08em; }
.footer-tagline { font-size: 0.78rem; color: var(--text-dim); margin-bottom: 1.2rem; }
.footer-links { display: flex; gap: 1.5rem; justify-content: center; list-style: none; flex-wrap: wrap; margin-bottom: 1.5rem; }
.footer-links a { font-family: var(--mono); font-size: 0.7rem; color: var(--text-dim); text-decoration: none; letter-spacing: 0.07em; transition: color 0.2s; }
.footer-links a:hover { color: var(--lime); }
.footer-copy { font-family: var(--mono); font-size: 0.63rem; color: var(--footer-copy); letter-spacing: 0.07em; }

/* =============================================
   RESPONSIVE
============================================= */
@media (max-width: 768px) {
  .cred-bar-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  nav { padding: 0.85rem 1rem; }
  .nav-links { display: none; }
}