/* =========================================================
   AI-инженерия и качество
   ========================================================= */

.section-ai {
  position: relative;
  overflow: hidden;
  border-block: 1px solid var(--border);
  background:
    radial-gradient(720px 340px at 82% -6%, rgba(0, 156, 255, 0.12), transparent 68%),
    radial-gradient(620px 320px at 8% 108%, rgba(56, 225, 176, 0.06), transparent 70%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0) 45%);
}
.section-ai::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.032) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}
.section-ai > .container { position: relative; }

/* ---------- pipeline ---------- */

.ai-flow {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.ai-flow li {
  position: relative;
  padding: 16px 15px 17px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(9, 14, 23, 0.66);
}
.ai-flow li span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--accent-2);
}
.ai-flow li strong { display: block; margin: 8px 0 5px; font-size: 13.5px; line-height: 1.3; }
.ai-flow li small { display: block; font-size: 11px; line-height: 1.45; color: var(--muted-2); }
.ai-flow li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -11px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.22);
}

/* ---------- method cards + metrics ---------- */

.ai-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
  gap: 22px;
  margin-top: 32px;
  align-items: start;
}
.ai-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.ai-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.006));
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.ai-card:hover { border-color: rgba(91, 140, 255, 0.4); transform: translateY(-2px); }
.ai-card .k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.6px;
  color: var(--accent-2);
}
.ai-card h3 { margin: 0 0 8px; font-size: 14.5px; }
.ai-card p { margin: 0; font-size: 12.8px; color: var(--muted); }

.ai-metrics {
  display: grid;
  gap: 2px;
  padding: 18px 20px;
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  background:
    radial-gradient(360px 220px at 100% 0%, rgba(0, 156, 255, 0.14), transparent 70%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
}
.ai-metric {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
}
.ai-metric:last-child { border-bottom: 0; }
.ai-metric b {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: 23px;
  font-weight: 750;
  letter-spacing: -0.6px;
  font-variant-numeric: tabular-nums;
}
.ai-metric span { font-size: 11.5px; color: var(--muted); line-height: 1.35; }

/* ---------- security ---------- */

.ai-security {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 26px;
  margin-top: 28px;
  padding: 24px 26px;
  border: 1px solid rgba(56, 225, 176, 0.24);
  border-radius: 18px;
  background: linear-gradient(160deg, rgba(56, 225, 176, 0.055), rgba(255, 255, 255, 0.008));
}
.ai-security h3 { margin: 0; font-size: 17px; letter-spacing: -0.2px; }
.ai-security .section-kicker { margin-bottom: 8px; }
.ai-security ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.ai-security li {
  position: relative;
  padding-left: 15px;
  font-size: 12.8px;
  color: var(--muted);
}
.ai-security li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-2);
}

/* ---------- traceability ---------- */

.ai-trace {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted-2);
}
.ai-trace ul { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.ai-trace li {
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
  letter-spacing: 0.8px;
  color: #b9c6de;
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .ai-flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ai-flow li::after { display: none; }
  .ai-grid { grid-template-columns: 1fr; }
  .ai-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 22px; }
  .ai-metric { border-bottom: 0; }
}
@media (max-width: 760px) {
  .ai-flow { grid-template-columns: 1fr; }
  .ai-cards { grid-template-columns: 1fr; }
  .ai-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ai-security { grid-template-columns: 1fr; gap: 16px; padding: 20px; }
  .ai-security ul { grid-template-columns: 1fr; }
}