:root {
  --about-bg: #ffffff;
  --about-text: #282a2f;
  --about-muted: #6f7580;
  --about-soft: #f6f7f8;
  --about-border: #e4e6ea;
  --about-accent: #2f6f5e;
  --about-accent-hover: #265b4d;
  --about-font-ui: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --about-font-body: Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--about-bg);
  color: var(--about-text);
  font-family: var(--about-font-body);
}

.about-shell {
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: 26px 28px 56px;
}

/* ── Nav ── */

.about-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
}

.about-brand {
  color: var(--about-text);
  font: 800 18px/1 var(--about-font-ui);
  text-decoration: none;
}

.about-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: flex-end;
}

.about-nav-links a,
.about-footer a {
  color: var(--about-muted);
  font: 650 14px/1.2 var(--about-font-ui);
  text-decoration: none;
}

.about-nav-links a:hover,
.about-footer a:hover {
  color: var(--about-text);
  text-decoration: underline;
}

/* ── Hero ── */

.about-hero {
  max-width: 760px;
  padding: 20px 0 48px;
}

.about-kicker {
  margin: 0 0 10px;
  font-family: var(--about-font-ui);
  color: var(--about-muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.about-hero h1 {
  margin: 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--about-text);
}

.about-lead {
  max-width: 640px;
  margin: 18px 0 0;
  color: var(--about-muted);
  font-size: 20px;
  line-height: 1.55;
}

.about-pills {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.about-pills li {
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--about-border);
  font-family: var(--about-font-ui);
  font-size: 12px;
  font-weight: 600;
  color: var(--about-muted);
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.about-button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--about-border);
  border-radius: 999px;
  padding: 0 18px;
  background: #fff;
  color: var(--about-text);
  font-family: var(--about-font-ui);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 0.12s;
}

.about-button:hover {
  border-color: #c8cad2;
}

.about-button--primary {
  border-color: var(--about-accent);
  background: var(--about-accent);
  color: #fff;
}

.about-button--primary:hover {
  background: var(--about-accent-hover);
  border-color: var(--about-accent-hover);
}

/* ── Intro (Что это) ── */

.about-intro {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: 52px;
  align-items: start;
  padding: 48px 0 56px;
  border-top: 1px solid var(--about-border);
}

.about-intro h2 {
  margin: 8px 0 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(26px, 2.8vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--about-text);
}

.about-intro-body {
  display: grid;
  gap: 16px;
}

.about-intro-body p {
  margin: 0;
  font-size: 18px;
  line-height: 1.65;
  color: var(--about-muted);
}

/* ── Strip (3 highlights) ── */

.about-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  padding: 28px 0 52px;
}

.about-strip div {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 20px 22px;
  background: var(--about-soft);
  border-radius: 8px;
}

.about-strip strong {
  margin: 0;
  font-family: var(--about-font-ui);
  color: var(--about-text);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
}

.about-strip span {
  font-family: var(--about-font-ui);
  color: var(--about-muted);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Steps (Как это работает) ── */

.about-steps-section {
  padding: 40px 0 52px;
  border-top: 1px solid var(--about-border);
}

.about-steps-section .about-kicker {
  margin-bottom: 20px;
}

.about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px 32px;
}

.about-steps li {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.step-n {
  font-family: var(--about-font-ui);
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: #d0d3da;
}

.step-t {
  font-family: var(--about-font-ui);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--about-text);
}

/* ── Generic full-width block ── */

.about-block {
  padding: 48px 0 52px;
  border-top: 1px solid var(--about-border);
}

.about-block-hd {
  margin-bottom: 32px;
}

.about-block-hd h2 {
  margin: 8px 0 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(26px, 2.8vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--about-text);
}

/* ── Audience cards (mosaic) ── */

.about-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-border);
  border: 1px solid var(--about-border);
  border-radius: 8px;
  overflow: hidden;
}

.about-cards article {
  background: var(--about-bg);
  padding: 26px 28px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.about-cards h3 {
  margin: 0;
  font-family: var(--about-font-ui);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--about-text);
}

.about-cards p {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: var(--about-muted);
}

/* ── Feature cards ── */

.about-feats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.about-feats > div:nth-child(odd):last-child {
  grid-column: 1 / -1;
}

.about-feats > div {
  padding: 22px 24px;
  background: var(--about-soft);
  border-radius: 8px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.about-feats h3 {
  margin: 0;
  font-family: var(--about-font-ui);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--about-text);
}

.about-feats p {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: var(--about-muted);
}

/* ── Compare ── */

.about-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.about-compare-item {
  display: grid;
  gap: 10px;
  padding: 20px 22px;
  border: 1px solid var(--about-border);
  border-radius: 8px;
}

.about-compare-label {
  display: block;
  font-family: var(--about-font-ui);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--about-text);
}

.about-compare-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: var(--about-muted);
}

/* ── Values ── */

.about-values-block {
  padding: 40px 36px 48px;
  border-radius: 8px;
  background: var(--about-soft);
}

.about-values-hd {
  margin-bottom: 26px;
}

.about-values-hd h2 {
  margin: 8px 0 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(26px, 2.8vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--about-text);
}

.about-values-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 32px;
}

.about-value-item {
  display: grid;
  gap: 7px;
}

.about-value-item h3 {
  margin: 0;
  font-family: var(--about-font-ui);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--about-text);
}

.about-value-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: var(--about-muted);
}

/* ── FAQ (2-col sidebar — intentional here) ── */

.about-section {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
  gap: 36px;
  padding: 48px 0;
  border-top: 1px solid var(--about-border);
}

.about-section h2 {
  margin: 8px 0 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(22px, 2.2vw, 30px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--about-text);
}

.about-faq {
  max-width: 680px;
}

.about-faq details {
  border-top: 1px solid var(--about-border);
  padding: 14px 0;
}

.about-faq details:last-child {
  border-bottom: 1px solid var(--about-border);
}

.about-faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--about-font-ui);
  color: var(--about-text);
  font-size: 16px;
  font-weight: 700;
}

.about-faq summary::-webkit-details-marker {
  display: none;
}

.about-faq summary::after {
  content: '+';
  font-family: var(--about-font-ui);
  font-size: 20px;
  font-weight: 300;
  color: var(--about-muted);
  flex-shrink: 0;
  line-height: 1;
}

details[open] > summary::after {
  content: '−';
}

.about-faq p {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.62;
  color: var(--about-muted);
}

/* ── CTA ── */

.about-cta {
  padding: 48px 0 52px;
  border-top: 1px solid var(--about-border);
}

.about-cta h2 {
  margin: 0;
  font-family: var(--about-font-ui);
  font-weight: 800;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--about-text);
}

.about-cta p {
  max-width: 580px;
  margin: 14px 0 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--about-muted);
}

.about-cta .about-actions {
  margin-top: 24px;
}

/* ── Footer ── */

.about-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding-top: 20px;
  border-top: 1px solid var(--about-border);
  font-family: var(--about-font-ui);
}

/* ── Responsive 820px ── */

@media (max-width: 820px) {
  .about-shell {
    padding: 24px 20px 48px;
  }

  .about-nav {
    align-items: flex-start;
    margin-bottom: 24px;
  }

  .about-hero {
    padding-bottom: 36px;
  }

  .about-lead {
    font-size: 18px;
  }

  .about-intro {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 28px 0 36px;
  }

  .about-strip {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-block {
    padding: 28px 0 32px;
  }

  .about-cards,
  .about-feats,
  .about-compare {
    grid-template-columns: 1fr;
  }

  .about-values-block {
    padding: 26px 22px 30px;
  }

  .about-values-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .about-section {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 28px 0;
  }
}

/* ── Responsive 520px ── */

@media (max-width: 520px) {
  .about-shell {
    padding-inline: 16px;
  }

  .about-nav {
    display: grid;
  }

  .about-nav-links {
    justify-content: flex-start;
  }

  .about-hero h1 {
    font-size: 34px;
  }

  .about-actions {
    display: grid;
  }

  .about-steps {
    grid-template-columns: 1fr;
  }

  .about-values-grid {
    grid-template-columns: 1fr;
  }

  .about-values-block {
    padding: 20px 16px 24px;
  }
}