/* Self-learning: a compact technology overview. */

/* Override the shared light-page text palette on this dark page. */
.self-learning-page main {
  color: #e6f4ff;
}
.self-learning-page .sl-hero h1,
.self-learning-page .sl-section h2,
.self-learning-page .sl-card h3,
.self-learning-page .sl-example h3 {
  color: #f4f9ff;
}
.self-learning-page main .eyebrow,
.self-learning-page main .text-link {
  color: #72c9eb;
}
.self-learning-page main .text-link:hover,
.self-learning-page main .text-link:focus-visible {
  color: #c5eeff;
}
.self-learning-page .sl-feedback strong {
  color: #e6f4ff;
}
.sl-skip {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 100;
  padding: 12px 18px;
  background: #fff;
  color: #071d30;
}
.sl-skip:focus { top: 12px; }
.sl-hero {
  position: relative;
  isolation: isolate;
  min-height: 650px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #061827;
}
.sl-hero-art {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.sl-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, #061827 0%, #061827ed 28%, #06182791 48%, #06182708 75%),
              linear-gradient(0deg, #061827 0%, transparent 24%);
}
.sl-hero-content { padding-top: 85px; padding-bottom: 85px; }
.sl-hero h1 {
  max-width: 660px;
  font-size: clamp(38px, 4.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 18px 0 26px;
}
.sl-lead {
  max-width: 520px;
  font-size: 22px;
  line-height: 1.45;
  color: #e6f4ff;
}
.sl-intro {
  max-width: 510px;
  line-height: 1.75;
  color: #b5c9d9;
  margin: 18px 0 25px;
}
.sl-section { padding: 78px 0; background: #061827; }
.sl-section h2 {
  max-width: 800px;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin: 16px 0 32px;
}
.sl-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.sl-card {
  padding: 30px;
  border: 1px solid #25465d;
  border-radius: 8px;
  background: linear-gradient(145deg, #102b40, #0a2031);
}
.sl-card-number { color: #72c9eb; font-size: 13px; letter-spacing: 0.12em; }
.sl-card h3 { font-size: 22px; line-height: 1.3; margin: 24px 0 16px; }
.sl-card p, .sl-vision p { color: #b5c9d9; line-height: 1.75; }
.sl-card p { margin-bottom: 0; }
.sl-vision { border-top: 1px solid #203d52; background: #091f30; }
.sl-vision-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.sl-vision .text-link { display: inline-block; margin-top: 20px; }
.sl-example { border-left: 2px solid #63c4e5; padding-left: 30px; }
.sl-example .sl-example-label { color: #72c9eb; font-size: 12px; letter-spacing: 0.08em; }
.sl-example h3 { font-size: 24px; line-height: 1.3; margin: 14px 0 24px; }
.sl-feedback { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.sl-feedback li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 26px 100px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid #294357;
  font-size: 14px;
}
.sl-feedback li::before { content: "0" counter(step); color: #72c9eb; }
.sl-feedback span { color: #b5c9d9; }
.sl-example .sl-status { font-size: 12px; margin: 20px 0 0; }
@media (max-width: 900px) {
  .sl-cards { gap: 14px; }
  .sl-card { padding: 22px; }
  .sl-vision-grid { gap: 35px; }
}
@media (max-width: 720px) {
  .sl-hero { min-height: 760px; align-items: flex-start; }
  .sl-hero-content { padding-top: 48px; padding-bottom: 300px; }
  .sl-hero-art { object-position: 68% bottom; }
  .sl-hero::after {
    background: linear-gradient(180deg, #061827 0%, #061827f5 35%, #06182780 60%, #06182718 80%, #061827 100%);
  }
  .sl-hero h1 { max-width: 520px; }
  .sl-lead { font-size: 19px; }
  .sl-intro { font-size: 15px; }
  .sl-section { padding: 52px 0; }
  .sl-cards, .sl-vision-grid { grid-template-columns: 1fr; }
  .sl-card { padding: 26px; }
  .sl-card h3 { margin-top: 16px; }
  .sl-example { padding-left: 20px; }
  .sl-feedback li { grid-template-columns: 22px 82px 1fr; gap: 8px; font-size: 13px; }
}