/* ======================================
   AI Product Engineering – Page Styles
   ====================================== */

:root {
  --ai-blue: #0663B3;
  --ai-deep: #1350A0;
  --ai-bright: #56ACF8;
  --ai-purple: #8D5CAC;
  --ai-magenta: #A944B4;
  --ai-ink: #16233A;
  --ai-body: #3A4453;
  --ai-muted: #6B7280;
  --ai-card: #F2F7FD;
  --ai-border: #DCE7F5;
}

/* ---------- layout container ---------- */
.ai-page-wrapper {
  font-family: 'Open Sans', 'Ubuntu', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ai-body);
}
.ai-page-wrapper *,
.ai-page-wrapper *::before,
.ai-page-wrapper *::after {
  box-sizing: border-box;
}
.ai-container {
  max-width: 1136px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- generic equal-height column rail ---------- */
.ai-rail {
  display: flex;
  gap: 24px;
  margin-top: 32px;
}
.ai-rail > .ai-cell {
  flex: 1;
  min-width: 0;
}

/* ---------- cover / hero ---------- */
.ai-cover {
  background: linear-gradient(128deg, #0A4E96 0%, #0C1550 26%, #070B30 56%, #0A0D36 74%, #661F6C 100%);
  color: #F4F8FF;
  padding: 80px 0 60px;
}
.ai-cover .ai-kicker {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2.6px;
  color: var(--ai-bright);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.ai-cover h1 {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.5px;
  color: #fff;
  margin: 0 0 24px;
}
.ai-cover .ai-lede {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.6;
  color: #C6D5EE;
  max-width: 680px;
  border-left: 3px solid var(--ai-bright);
  padding-left: 24px;
  margin: 0;
}
.ai-chiprail {
  display: flex;
  gap: 20px;
  margin-top: 48px;
}
.ai-chip {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(86, 172, 248, 0.40);
  border-radius: 12px;
  padding: 24px;
  flex: 1;
}
.ai-chip .ai-big {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.ai-chip .ai-lbl {
  font-size: 13px;
  color: #A8BCDB;
  margin-top: 8px;
  line-height: 1.4;
}
.ai-cover .ai-foot {
  font-size: 14px;
  color: #8FA3C4;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  padding-top: 20px;
  margin-top: 48px;
}
.ai-cover .ai-foot strong {
  color: #E8EFFA;
  font-weight: 600;
}

/* ---------- section furniture ---------- */
.ai-section {
  padding: 64px 0;
}
.ai-section:nth-child(even) {
  background: #FAFCFF;
}
.ai-sec-head {
  margin-bottom: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0;
}
.ai-sec-head .ai-sq {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  margin-right: 16px;
  margin-top: 2px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--ai-bright) 0%, var(--ai-blue) 48%, var(--ai-magenta) 100%);
}
.ai-sec-head .ai-text {
  flex: 1;
}
.ai-eyebrow {
  font-size: 16px;
  font-weight: 800;
  color: var(--ai-magenta);
  line-height: 1.2;
}
.ai-page-wrapper h2 {
  font-size: clamp(24px, 3.5vw, 32px);
  font-weight: 800;
  color: var(--ai-blue);
  line-height: 1.2;
  letter-spacing: -0.3px;
  margin: 4px 0 0;
}
.ai-intro {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ai-body);
  max-width: 900px;
}
.ai-sub {
  font-size: 17px;
  font-weight: 700;
  color: var(--ai-purple);
  margin: 40px 0 16px;
}

/* ---------- pillars ---------- */
.ai-pillar {
  background: var(--ai-card);
  border: 1px solid var(--ai-border);
  border-radius: 12px;
  padding: 24px;
  border-top: 4px solid var(--ai-blue);
}
.ai-pillar h3 {
  color: var(--ai-blue);
  font-size: 17px;
  margin: 0 0 8px;
}
.ai-pillar p {
  font-size: 14px;
  line-height: 1.55;
  margin: 0;
}

/* ---------- table ---------- */
.ai-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 16px;
}
.ai-grid th {
  background: var(--ai-deep);
  color: #fff;
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
}
.ai-grid td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--ai-border);
  vertical-align: top;
}
.ai-grid tr:nth-child(even) td {
  background: var(--ai-card);
}
.ai-grid td.ai-k {
  font-weight: 600;
  color: var(--ai-ink);
  width: 46%;
}

/* ---------- pricing tiers ---------- */
.ai-tier {
  border: 1px solid var(--ai-border);
  border-radius: 14px;
  padding: 28px 24px;
  background: #fff;
}
.ai-tier.ai-feat {
  background: linear-gradient(160deg, #0663B3 0%, #8D5CAC 100%);
  border: 1px solid #7A4E9B;
}
.ai-badge {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.3px;
  text-transform: uppercase;
  color: #0B2F63;
  background: var(--ai-bright);
  border-radius: 40px;
  padding: 4px 14px;
  display: inline-block;
  margin-bottom: 14px;
}
.ai-tier .ai-nm {
  font-size: 20px;
  font-weight: 800;
  color: var(--ai-blue);
}
.ai-tier.ai-feat .ai-nm { color: #fff; }
.ai-tier .ai-pr {
  font-size: 36px;
  font-weight: 800;
  color: var(--ai-ink);
  line-height: 1.2;
  margin-top: 8px;
  letter-spacing: -0.6px;
}
.ai-tier.ai-feat .ai-pr { color: #fff; }
.ai-ph {
  display: inline-block;
  width: 68px;
  border-bottom: 2.2px dashed var(--ai-magenta);
}
.ai-tier .ai-dur {
  font-size: 14px;
  font-weight: 700;
  color: var(--ai-purple);
  margin-top: 6px;
}
.ai-tier.ai-feat .ai-dur { color: #EBDAF5; }
.ai-tier .ai-pitch {
  font-size: 14px;
  line-height: 1.55;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--ai-border);
  color: var(--ai-body);
}
.ai-tier.ai-feat .ai-pitch {
  color: #F0E7F7;
  border-top: 1px solid rgba(255, 255, 255, 0.32);
}
.ai-tier ul {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.ai-tier li {
  font-size: 14px;
  line-height: 1.5;
  padding-left: 20px;
  margin-bottom: 10px;
  position: relative;
  color: var(--ai-body);
}
.ai-tier li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ai-bright);
}
.ai-tier.ai-feat li { color: #F5EFF9; }
.ai-tier.ai-feat li::before { background: #fff; }

.ai-note {
  background: var(--ai-card);
  border: 1px solid var(--ai-border);
  border-left: 4px solid var(--ai-bright);
  border-radius: 10px;
  padding: 24px;
  font-size: 15px;
  line-height: 1.6;
  margin-top: 40px;
}
.ai-note b { color: var(--ai-ink); }

/* ---------- approach columns ---------- */
.ai-col {
  border: 1px solid var(--ai-border);
  border-radius: 12px;
  background: #fff;
  overflow: hidden;
}
.ai-col .ai-hd {
  background: var(--ai-deep);
  color: #fff;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.35;
}
.ai-col .ai-bd { padding: 16px; }
.ai-col .ai-lab {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--ai-purple);
  margin-top: 14px;
}
.ai-col .ai-lab.ai-first { margin-top: 0; }
.ai-col .ai-val {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ai-body);
  margin-top: 2px;
}
.ai-col .ai-to {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ai-body);
  border-top: 1px solid var(--ai-border);
  margin: 0 16px;
  padding: 14px 0 16px;
}

/* ---------- cost blocks ---------- */
.ai-cost {
  border-left: 3px solid var(--ai-purple);
  padding-left: 16px;
  margin-bottom: 24px;
}
.ai-cost h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ai-ink);
  margin: 0 0 4px;
}
.ai-cost p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
}

/* ---------- stack boxes ---------- */
.ai-box {
  background: var(--ai-card);
  border: 1px solid var(--ai-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}
.ai-box:last-child { margin-bottom: 0; }
.ai-box h3 {
  color: var(--ai-blue);
  font-size: 17px;
  border-bottom: 1px solid var(--ai-border);
  padding-bottom: 10px;
  margin: 0 0 4px;
}
.ai-box dl { margin: 0; }
.ai-box dt {
  font-weight: 700;
  color: var(--ai-ink);
  font-size: 14px;
  margin-top: 12px;
}
.ai-box dd {
  margin: 2px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ai-body);
}

/* ---------- facts ---------- */
.ai-fact {
  margin-top: 28px;
  padding-left: 20px;
  border-left: 3px solid var(--ai-border);
}
.ai-fact h3 {
  color: var(--ai-blue);
  font-size: 17px;
  margin: 0 0 6px;
}
.ai-fact p {
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
}

/* ---------- CTA ---------- */
.ai-cta {
  margin-top: 48px;
  border-radius: 14px;
  padding: 40px 32px;
  background: linear-gradient(128deg, #0A4E96 0%, #0C1550 42%, #4A1A5E 100%);
  color: #fff;
}
.ai-cta h3 {
  color: #fff;
  font-size: 26px;
  font-weight: 800;
  line-height: 1.2;
  margin: 0;
}
.ai-cta p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: #C6D5EE;
  max-width: 680px;
}
.ai-cta .ai-line {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 14px;
  color: #E8EFFA;
}
.ai-cta .ai-line b { color: #fff; }

/* ---------- back link ---------- */
.ai-back-link {
  display: inline-block;
  margin-top: 24px;
  font-size: 15px;
  color: var(--ai-bright);
  text-decoration: none;
  font-weight: 600;
}
.ai-back-link:hover {
  text-decoration: underline;
}

/* ---------- responsive ---------- */
@media (max-width: 768px) {
  .ai-rail,
  .ai-chiprail {
    flex-direction: column;
  }
  .ai-cover {
    padding: 60px 0 40px;
  }
  .ai-section {
    padding: 40px 0;
  }
  .ai-sec-head .ai-sq {
    display: none;
  }
}