*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #020617;
  color: #e5e7eb;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1100px, 100% - 32px);
  margin: 0 auto;
}

/* Кнопки */

.btn {
  border-radius: 999px;
  padding: 11px 22px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.btn--primary {
  background: linear-gradient(to right, #22c55e, #3b82f6);
  color: #fff;
  box-shadow: 0 10px 26px rgba(59, 130, 246, 0.5);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(59, 130, 246, 0.7);
}

/* Шапка */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: linear-gradient(to bottom, rgba(2, 6, 23, 0.96), transparent);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
}

.logo {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Навигация */

.nav {
  display: flex;
  gap: 18px;
}

.nav__link {
  color: #cbd5f5;
  text-decoration: none;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  position: relative;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, #22c55e, #3b82f6);
  transition: width 0.2s ease;
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Бургер */

.burger {
  display: none;
  width: 30px;
  height: 22px;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

.burger span {
  display: block;
  height: 3px;
  border-radius: 999px;
  background-color: #e5e7eb;
  margin: 3px 0;
}

/* Hero */

.hero {
  padding: 80px 0 70px;
  background:
    radial-gradient(circle at 0% 0%, rgba(34, 197, 94, 0.35), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(59, 130, 246, 0.25), transparent 60%);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero__eyebrow {
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: #bbf7d0;
  margin-bottom: 10px;
}

.hero__title {
  margin: 0 0 14px;
  font-size: clamp(30px, 4vw, 40px);
}

.hero__subtitle {
  margin: 0 0 16px;
  color: #9ca3af;
  max-width: 430px;
}

.hero__bullets {
  margin: 0 0 18px;
  padding-left: 18px;
  color: #d1d5db;
  font-size: 14px;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.hero__note {
  font-size: 13px;
  color: #bbf7d0;
}

/* Hero side */

.hero__side {
  position: relative;
  padding: 18px 18px 16px;
  border-radius: 22px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.4), rgba(15, 23, 42, 0.95));
}

.hero__tag {
  position: absolute;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.7);
}

.hero__tag--green {
  top: -10px;
  left: 16px;
}

.hero__tag--blue {
  top: 24px;
  right: -6px;
}

.hero__tag--purple {
  bottom: -10px;
  left: 24px;
}

.hero__code {
  margin-top: 18px;
  background-color: rgba(15, 23, 42, 0.94);
  border-radius: 14px;
  padding: 12px 14px;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  line-height: 1.5;
  color: #e5e7eb;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.9);
}

/* Общие секции */

.section {
  padding: 60px 0;
  background-color: transparent;
}

.section--gray {
  background-color: #020617;
}

.section__title {
  margin: 0 0 12px;
  font-size: 24px;
  text-align: center;
}

.section__subtitle {
  margin: 0 0 30px;
  text-align: center;
  color: #9ca3af;
}

/* Для кого */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tile {
  border-radius: 18px;
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top, rgba(51, 65, 85, 0.9), rgba(15, 23, 42, 1));
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.tile h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.tile p {
  margin: 0;
  font-size: 14px;
  color: #d1d5db;
}

/* Программа */

.modules {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.module {
  border-radius: 16px;
  padding: 14px 14px 12px;
  background-color: #020617;
  border: 1px solid rgba(148, 163, 184, 0.45);
}

.module__week {
  font-size: 12px;
  color: #22c55e;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.module__title {
  margin: 0 0 6px;
  font-size: 15px;
}

.module p {
  margin: 0;
  font-size: 13px;
  color: #9ca3af;
}

/* Отзывы */

.reviews {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.review {
  border-radius: 18px;
  padding: 18px 18px 14px;
  background-color: #020617;
  border: 1px solid rgba(148, 163, 184, 0.45);
}

.review__text {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 14px;
  color: #e5e7eb;
}

.review__author {
  margin: 0;
  font-size: 13px;
  color: #9ca3af;
}

/* FAQ */

.accordion {
  max-width: 780px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.accordion__item {
  border-radius: 14px;
  background-color: #020617;
  border: 1px solid rgba(148, 163, 184, 0.45);
}

.accordion__header {
  width: 100%;
  border: none;
  background: none;
  color: inherit;
  font: inherit;
  padding: 11px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.accordion__icon {
  font-size: 18px;
  color: #22c55e;
  margin-left: 12px;
}

.accordion__body {
  display: none;
  padding: 0 14px 12px;
  font-size: 14px;
  color: #9ca3af;
}

.accordion__item--open .accordion__body {
  display: block;
}

.accordion__item--open .accordion__icon {
  transform: rotate(45deg);
}

/* Контакты */

.contact {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 22px;
  align-items: flex-start;
}

.contact__field {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
}

.contact__field input,
.contact__field textarea,
.contact__field select {
  width: 100%;
  margin-top: 4px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(55, 65, 81, 0.9);
  background-color: #020617;
  color: #e5e7eb;
  font-family: inherit;
  font-size: 14px;
}

.contact__field input:focus,
.contact__field textarea:focus,
.contact__field select:focus {
  outline: none;
  border-color: #3b82f6;
}

.contact__note {
  margin-top: 6px;
  font-size: 12px;
  color: #9ca3af;
}

.contact__info {
  border-radius: 18px;
  padding: 16px 16px 14px;
  background: radial-gradient(circle at top, rgba(51, 65, 85, 0.9), rgba(15, 23, 42, 1));
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.contact__info h3 {
  margin-top: 0;
}

/* Футер */

.footer {
  border-top: 1px solid rgba(15, 23, 42, 1);
  background-color: #020617;
  padding: 16px 0;
  font-size: 13px;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__link {
  color: #3b82f6;
  text-decoration: none;
}

/* Адаптив */

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 700px) {
  .burger {
    display: block;
  }

  .nav {
    position: fixed;
    inset: 56px 0 auto 0;
    background-color: #020617;
    flex-direction: column;
    padding: 16px;
    gap: 12px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .grid-3,
  .modules,
  .reviews {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 60px;
  }
}