* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: Arial, "Helvetica Neue", sans-serif;
  background: #e9eef2;
  color: #173b5d;
}

body {
  margin: 0;
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 12px;
  z-index: 20;
  padding: 12px;
  background: #fff;
  color: #002f5e;
}

.skip-link:focus {
  top: 12px;
}

.exp-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #002f5e;
  color: #fff;
  box-shadow: 0 3px 16px rgba(0, 47, 94, 0.16);
}

.exp-header > div,
.exp-main,
.exp-footer > div {
  width: min(100% - 32px, 980px);
  margin: auto;
}

.exp-header > div {
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.exp-brand {
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.exp-label {
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.exp-main {
  padding: 30px 0 70px;
}

.exp-note {
  padding: 14px 16px;
  border-left: 4px solid #33cd56;
  background: #fff;
  color: #4a647b;
  font-size: 0.9rem;
}

.exp-hero {
  margin: 24px 0;
  padding: clamp(24px, 5vw, 52px);
  border-radius: 18px;
  background: linear-gradient(135deg, #002f5e, #007acc);
  box-shadow: 0 18px 48px rgba(0, 47, 94, 0.18);
  color: #fff;
}

.exp-kicker {
  margin: 0;
  color: #77e38f;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.exp-hero h1 {
  margin: 14px 0 18px;
  color: #fff;
}

.exp-hero .exp-lead {
  color: #e9eef2;
}

.hero-media {
  display: block;
  margin: 0 0 24px;
  overflow: hidden;
  border: 1px solid #c4d3de;
  border-radius: 10px;
  background: #fff;
}

.hero-media img,
.interface-media img {
  display: block;
  width: 100%;
  height: auto;
}

.interface-media {
  display: block;
  margin: 28px 0;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 47, 94, 0.14);
}

.exp-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 16px;
  padding: 17px 19px;
  border: 1px solid #c4d3de;
  border-radius: 10px;
  background: #fff;
}

.exp-toc a {
  color: #0068ad;
  font-weight: 700;
}

h1 {
  margin: 36px 0 18px;
  color: #002f5e;
  font-size: clamp(2rem, 7vw, 3.8rem);
  line-height: 1.06;
}

h2 {
  margin: 42px 0 12px;
  color: #007acc;
  font-size: 1.45rem;
}

p,
li {
  font-size: 1rem;
  line-height: 1.72;
}

.exp-lead {
  color: #4a647b;
  font-size: 1.15rem;
}

.exp-card {
  margin-top: 34px;
  padding: 22px;
  border: 1px solid #c4d3de;
  border-radius: 10px;
  background: #fff;
}

.exp-card h2 {
  margin-top: 0;
}

.exp-card ul {
  margin-bottom: 0;
  padding-left: 22px;
}

.exp-card li {
  margin: 7px 0;
}

.exp-cta {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  margin-top: 18px;
  padding: 12px 20px;
  border-radius: 6px;
  background: #33cd56;
  color: #002f5e;
  font-weight: 800;
  text-decoration: none;
}

.exp-cta:hover {
  filter: brightness(1.05);
}

.exp-cta:focus-visible,
.exp-toc a:focus-visible,
.exp-brand:focus-visible,
summary:focus-visible {
  outline: 3px solid #33cd56;
  outline-offset: 3px;
}

.discussion {
  margin-top: 42px;
}

.discussion-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.discussion-heading h2 {
  margin: 4px 0;
}

.discussion-heading > span {
  padding: 6px 10px;
  border-radius: 999px;
  background: #dbe7ef;
  color: #002f5e;
  font-size: 0.82rem;
  font-weight: 700;
}

.discussion-disclaimer {
  padding: 12px 14px;
  border-radius: 8px;
  background: #fff8dc;
  color: #66571c;
  font-size: 0.88rem;
}

.comment {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 13px;
  margin: 12px 0;
  padding: 16px;
  border: 1px solid #c4d3de;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 5px 18px rgba(0, 47, 94, 0.05);
}

.comment-avatar {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, #007acc, #002f5e);
  color: #fff;
  font-weight: 800;
}

.comment p {
  margin: 4px 0;
}

.comment-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px 10px;
}

.comment-meta span {
  color: #668097;
  font-size: 0.78rem;
}

.comment-reply {
  margin-left: 58px;
  background: #f8fbfd;
}

.faq-section details {
  margin: 10px 0;
  border: 1px solid #c4d3de;
  border-radius: 8px;
  background: #fff;
}

.faq-section summary {
  min-height: 52px;
  padding: 15px 42px 15px 17px;
  cursor: pointer;
  color: #002f5e;
  font-weight: 800;
}

.faq-section details p {
  margin: 0;
  padding: 0 17px 17px;
  color: #4a647b;
}

.exp-footer {
  padding: 25px 0;
  background: #002f5e;
  color: #bfd1e0;
  font-size: 0.85rem;
}

.exp-footer p {
  margin: 4px 0;
  font-size: 0.85rem;
}

@media (max-width: 540px) {
  .exp-main {
    padding-top: 18px;
  }

  .exp-header > div {
    min-height: 58px;
  }

  .exp-label {
    font-size: 0.65rem;
  }

  .exp-hero {
    border-radius: 12px;
  }

  h1 {
    font-size: 2rem;
  }

  .exp-toc {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .exp-toc strong {
    grid-column: 1 / -1;
  }

  .comment-reply {
    margin-left: 22px;
  }

  .discussion-heading {
    align-items: start;
  }

  .hero-media {
    border-radius: 8px;
  }
}