:root {
  --bg: #f7f8f3;
  --surface: #ffffff;
  --ink: #162116;
  --muted: #667064;
  --line: #dfe5dc;
  --green: #5f9f2f;
  --green-dark: #315f1f;
  --amber: #d3922e;
  --blue: #2f6f8f;
  --shadow: 0 20px 50px rgba(22, 33, 22, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 52px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand img {
  width: 158px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--green-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 6px;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: clamp(48px, 8vw, 100px) clamp(18px, 5vw, 72px) 42px;
  background:
    linear-gradient(115deg, rgba(247, 248, 243, 0.94), rgba(247, 248, 243, 0.76)),
    url("assets/weight-loss.jpg") center / cover;
}

.hero__content {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(54px, 9vw, 112px);
}

h2 {
  font-size: clamp(30px, 4.4vw, 54px);
}

h3 {
  font-size: 21px;
}

.lead {
  max-width: 640px;
  margin: 22px 0 0;
  color: #2f392f;
  font-size: clamp(19px, 2.3vw, 26px);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button--primary {
  color: #fff;
  background: var(--green-dark);
}

.button--primary:hover {
  background: #264a18;
}

.button--secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border-color: var(--line);
}

.hero__media {
  justify-self: center;
  display: grid;
  gap: 16px;
  justify-items: center;
  width: min(100%, 360px);
  padding: 26px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  box-shadow: var(--shadow);
  text-align: center;
}

.hero__media img {
  width: 210px;
  border-radius: 8px;
}

.hero__media strong,
.hero__media span {
  display: block;
}

.hero__media span {
  color: var(--muted);
}

.section {
  padding: clamp(54px, 8vw, 96px) clamp(18px, 5vw, 72px);
  content-visibility: auto;
  contain-intrinsic-size: 720px;
}

.section__heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.intro {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(24px, 5vw, 72px);
  background: var(--surface);
}

.intro__text {
  max-width: 820px;
  color: #2f392f;
  font-size: 19px;
}

.check-list {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
}

.check-list li::before {
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 900;
  content: "✓";
}

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

.course-card {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 14px 34px rgba(22, 33, 22, 0.06);
}

.course-card img {
  width: 100%;
  aspect-ratio: 439 / 300;
  object-fit: cover;
}

.course-card div {
  padding: 22px;
}

.course-card p {
  margin: 12px 0 0;
  color: var(--muted);
}

.course-card__link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--green-dark);
  font-weight: 800;
  text-decoration: none;
}

.course-card__link:hover {
  text-decoration: underline;
}

.course-card--text {
  display: flex;
  align-items: center;
  min-height: 260px;
  background: #eef5ed;
}

.course-page {
  background: var(--surface);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px clamp(18px, 5vw, 72px) 0;
  color: #5f6f60;
  font-size: 15px;
  font-weight: 700;
}

.breadcrumbs a {
  color: var(--green-dark);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.course-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 480px);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding: clamp(48px, 8vw, 96px) clamp(18px, 5vw, 72px);
  background: #eef5ed;
}

.course-hero img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.course-hero .lead {
  font-size: clamp(18px, 2vw, 24px);
}

.course-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 360px);
  gap: clamp(28px, 5vw, 72px);
  padding: clamp(44px, 7vw, 84px) clamp(18px, 5vw, 72px);
}

.course-content h2 {
  margin-top: 32px;
  font-size: clamp(26px, 3vw, 38px);
}

.course-content p,
.course-content li {
  color: #2f392f;
  font-size: 18px;
}

.course-aside {
  align-self: start;
  display: grid;
  gap: 14px;
  padding: 24px;
  background: var(--ink);
  border-radius: 8px;
  color: #fff;
}

.course-aside p {
  margin: 0;
  color: #dbe8d7;
}

.author {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: clamp(26px, 5vw, 70px);
  align-items: start;
  background: var(--surface);
}

.author__photo {
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.author__photo img {
  width: 100%;
  border-radius: 6px;
}

.author__content p {
  max-width: 860px;
  color: #2f392f;
  font-size: 18px;
}

.offer-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.offer-list span {
  padding: 9px 12px;
  background: #e9f4e6;
  border: 1px solid #cfe3c9;
  border-radius: 6px;
  font-weight: 700;
}

.calculator {
  background: #eef5ed;
}

.bmi-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(160px, 240px)) auto;
  gap: 14px;
  align-items: end;
}

.bmi-form label {
  display: grid;
  gap: 8px;
  font-weight: 800;
}

.bmi-form input {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

.bmi-result {
  display: block;
  margin-top: 18px;
  color: var(--green-dark);
  font-size: 20px;
  font-weight: 800;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 900px;
}

details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  padding: 18px 20px;
  font-weight: 800;
  cursor: pointer;
}

details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.contacts {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  gap: 28px;
  background: var(--surface);
}

.contacts p {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

.contact-box {
  display: grid;
  gap: 12px;
  padding: 24px;
  background: var(--ink);
  border-radius: 8px;
  color: #fff;
  font-style: normal;
}

.contact-box a {
  color: #fff;
  text-decoration: none;
}

.contact-form {
  display: grid;
  gap: 14px;
  max-width: 680px;
  margin-top: 24px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 800;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  min-height: 46px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

.contact-form textarea {
  resize: vertical;
}

.form-hidden {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: var(--green-dark);
  font-weight: 800;
}

.form-status.is-error {
  color: #a33a2f;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  color: #fff;
  background: #162116;
}

.site-footer img {
  width: 145px;
  filter: brightness(0) invert(1);
}

.site-footer p {
  margin: 0;
  font-weight: 800;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a {
  color: #fff;
  text-decoration: none;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 10px;
  }

  .hero,
  .intro,
  .author,
  .contacts,
  .course-hero,
  .course-content {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero__media {
    justify-self: start;
  }

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

  .bmi-form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .brand img {
    width: 138px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

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

  .section {
    padding-top: 48px;
    padding-bottom: 48px;
  }
}