/* ============================================================
   SSB — Секции: О системе, Возможности, Вопросы
   ============================================================ */

.section {
  max-width: 1100px;
  margin: 0 auto var(--space-4);
  padding: var(--space-5) clamp(24px, 4vw, 56px);
  scroll-margin-top: 40px;

  /* Плотная подложка: текст секций не лежит на фото */
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055) 0%, rgba(255, 255, 255, 0.015) 30%, rgba(255, 255, 255, 0) 60%),
    rgba(17, 15, 12, 0.72);
  -webkit-backdrop-filter: blur(26px) saturate(1.05);
  backdrop-filter: blur(26px) saturate(1.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 20px 60px rgba(0, 0, 0, 0.4);
}

.section__head {
  margin-bottom: var(--space-5);
}

.section__label {
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-amber);
  margin-bottom: var(--space-2);
}

.section__title {
  font-size: clamp(1.7rem, 2.6vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.section__sub {
  margin-top: var(--space-2);
  font-size: var(--fs-body);
  color: var(--color-text-muted);
  max-width: 640px;
}

/* ================= О СИСТЕМЕ ================= */

.about {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: var(--space-5);
  align-items: start;
}

.about__lead p {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--color-text);
}

.about__lead p + p {
  margin-top: var(--space-3);
}

.about__lead strong {
  color: var(--color-amber-light);
  font-weight: 700;
}

.about__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.about__card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07) 0%, rgba(255, 255, 255, 0.015) 50%),
    rgba(40, 35, 29, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-left: 3px solid var(--color-amber);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: 0 0 30px rgba(235, 156, 61, 0.08);
}

.about__principle {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.about__principle-label {
  margin-top: var(--space-2);
  font-size: var(--fs-small);
  color: var(--color-text-dim);
}

.about__made {
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ================= ВОЗМОЖНОСТИ ================= */

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.feature {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.012) 50%),
    rgba(40, 35, 29, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: border-color var(--t-mid), transform var(--t-mid), background-color var(--t-mid);
}

.feature:hover {
  border-color: rgba(209, 145, 60, 0.4);
  transform: translateY(-2px);
}

.feature__num {
  display: block;
  font-size: var(--fs-small);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-amber-light);
  margin-bottom: var(--space-2);
  text-shadow: 0 0 12px rgba(235, 156, 61, 0.4);
}

.feature__title {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
}

.feature__text {
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* Карточка роадмапа — слегка выделена */
.feature--roadmap {
  border-style: dashed;
  border-color: rgba(209, 145, 60, 0.3);
}

.feature--roadmap:hover {
  border-color: rgba(209, 145, 60, 0.55);
}

/* ================= FAQ ================= */

.faq {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 820px;
}

.faq__item {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055) 0%, rgba(255, 255, 255, 0.012) 60%),
    rgba(40, 35, 29, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  overflow: hidden;
  transition: border-color var(--t-mid);
}

.faq__item[open] {
  border-color: rgba(209, 145, 60, 0.35);
}

.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--t-fast);
}

.faq__q::-webkit-details-marker {
  display: none;
}

/* Плюс, поворачивающийся в крест */
.faq__q::after {
  content: "+";
  flex-shrink: 0;
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-amber);
  line-height: 1;
  transition: transform var(--t-mid);
}

.faq__item[open] .faq__q::after {
  transform: rotate(45deg);
}

.faq__q:hover {
  color: var(--color-amber-light);
}

.faq__a {
  padding: 0 var(--space-4) var(--space-3);
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 680px;
}

/* ================= Адаптив секций ================= */

@media (max-width: 1023px) {
  .section {
    padding: var(--space-5) 0;
  }

  .about {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .features {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1024px) and (max-width: 1439px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* ================= ФИНАЛЬНЫЙ CTA ================= */

.cta {
  max-width: 1100px;
  margin: var(--space-5) auto var(--space-6);
  padding: var(--space-6) clamp(24px, 4vw, 56px);
  text-align: center;

  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.015) 40%, rgba(255, 255, 255, 0) 70%),
    rgba(17, 15, 12, 0.72);
  -webkit-backdrop-filter: blur(26px) saturate(1.05);
  backdrop-filter: blur(26px) saturate(1.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 20px 60px rgba(0, 0, 0, 0.4);
}

.cta__title {
  font-size: clamp(1.7rem, 2.8vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  background: var(--grad-amber-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 18px rgba(235, 156, 61, 0.25));
}

.cta__sub {
  margin-top: var(--space-2);
  font-size: var(--fs-body);
  color: var(--color-text-muted);
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.cta__btn {
  min-width: 220px;
  min-height: 54px;
}

@media (max-width: 767px) {
  .cta {
    padding: var(--space-5) var(--space-3);
    margin-bottom: var(--space-5);
  }

  .cta__actions {
    flex-direction: column;
  }

  .cta__btn {
    width: 100%;
  }
}