:root {
  --bg: #f4f6f3;
  --surface: #ffffff;
  --ink: #132022;
  --muted: #5e6b6d;
  --dark: #0b1113;
  --dark-2: #121c1f;
  --green: #72bd36;
  --green-dark: #4e9222;
  --line: #dfe6df;
  --shadow: 0 18px 45px rgba(18, 37, 31, .12);
  --radius: 22px;
  --container: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--bg); color: var(--ink); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(var(--container), calc(100% - 2rem)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(8,14,16,.94); border-bottom: 1px solid rgba(255,255,255,.08); backdrop-filter: blur(14px); }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: flex; align-items: center; gap: .8rem; color: #fff; }
.brand img { width: 50px; height: 50px; border-radius: 14px; }
.brand strong { display: block; font-size: 1.18rem; letter-spacing: .02em; }
.brand small { display: block; color: #aab7b5; font-size: .8rem; }
nav { display: flex; flex-wrap: wrap; gap: 1.2rem; }
nav a { color: #e5ece9; font-size: .94rem; font-weight: 700; }
nav a:hover { color: var(--green); }
.hero { min-height: 720px; position: relative; display: grid; align-items: center; overflow: hidden; background: #101719; }
.hero-image, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-image { object-fit: cover; object-position: center; }
.hero-shade { background: linear-gradient(90deg, rgba(5,10,12,.94) 0%, rgba(5,10,12,.76) 42%, rgba(5,10,12,.15) 82%); }
.hero-content { position: relative; z-index: 2; color: #fff; padding-block: 7rem; }
.kicker { margin: 0 0 .7rem; color: #a7e572; text-transform: uppercase; letter-spacing: .13em; font-size: .78rem; font-weight: 900; }
.kicker.dark { color: var(--green-dark); }
.hero h1 { max-width: 730px; margin: 0; font-size: clamp(3rem, 6.5vw, 6.2rem); line-height: .98; letter-spacing: -.045em; }
.lead { max-width: 680px; color: #dbe4e1; font-size: 1.12rem; margin: 1.5rem 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; padding: .95rem 1.35rem; border-radius: 999px; font-weight: 850; transition: .2s ease; }
.button:hover { transform: translateY(-2px); }
.primary { background: var(--green); color: #0b1808; }
.ghost { color: #fff; border: 1px solid rgba(255,255,255,.38); background: rgba(255,255,255,.06); }
.benefits { background: var(--dark); color: #fff; border-top: 1px solid rgba(255,255,255,.06); }
.benefit-grid { display: grid; grid-template-columns: repeat(4,1fr); }
.benefit-grid article { padding: 2rem 1.5rem; border-right: 1px solid rgba(255,255,255,.1); }
.benefit-grid article:last-child { border-right: 0; }
.benefit-grid span { color: var(--green); font-size: .8rem; font-weight: 900; }
.benefit-grid h2 { margin: .35rem 0 .35rem; font-size: 1.1rem; }
.benefit-grid p { margin: 0; color: #acb9b6; font-size: .94rem; }
.section { padding: 6rem 0; }
.section-heading { max-width: 760px; margin: 0 auto 2.7rem; text-align: center; }
.section-heading.left { margin: 0; text-align: left; }
.section-heading h2, .science h2 { margin: 0; font-size: clamp(2.1rem, 4vw, 3.6rem); line-height: 1.08; letter-spacing: -.035em; }
.section-heading > p:last-child { color: var(--muted); }
.course-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.4rem; }
.course-card { overflow: hidden; border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.course-card img { width: 100%; aspect-ratio: 1.48; object-fit: cover; }
.course-body { padding: 1.45rem; }
.tag { display: inline-block; padding: .25rem .7rem; border-radius: 999px; background: #eaf6df; color: var(--green-dark); font-size: .78rem; font-weight: 900; text-transform: uppercase; }
.course-body h3 { margin: .8rem 0 .5rem; font-size: 1.35rem; line-height: 1.2; }
.course-body p { color: var(--muted); }
.course-body a { color: var(--green-dark); font-weight: 850; }
.science { padding: 6rem 0; background: var(--dark-2); color: #fff; }
.science-grid { display: grid; grid-template-columns: 1.25fr .85fr; gap: 4rem; align-items: center; }
.science p { color: #bdc8c6; }
.formula-cards { display: grid; gap: 1rem; }
.formula-cards article { padding: 1.35rem; border-radius: 18px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1); }
.formula-cards strong, .formula-cards span { display: block; }
.formula-cards strong { color: var(--green); text-transform: uppercase; font-size: .8rem; letter-spacing: .1em; }
.formula-cards span { margin: .3rem 0; font-size: 1.65rem; font-weight: 900; }
.formula-cards p { margin: 0; font-size: .92rem; }
.habits-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 4rem; align-items: start; }
.checklist { display: grid; gap: 1rem; }
.checklist div { display: grid; grid-template-columns: 42px 1fr; gap: 1rem; align-items: start; padding: 1.15rem; border-radius: 17px; background: #fff; border: 1px solid var(--line); }
.checklist span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--green); color: #0c1709; font-weight: 900; }
.checklist p { margin: 0; color: var(--muted); }
.checklist strong { color: var(--ink); }
.resources { padding: 6rem 0; background: #edf1ec; }
.resource-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 1rem; }
.resource-grid a { min-height: 230px; display: flex; flex-direction: column; padding: 1.35rem; border-radius: 18px; background: #fff; border: 1px solid var(--line); transition: .2s ease; }
.resource-grid a:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: #c1d8ae; }
.resource-grid strong { font-size: 1.05rem; }
.resource-grid span { margin-top: .65rem; color: var(--muted); font-size: .92rem; }
.resource-grid em { margin-top: auto; color: var(--green-dark); font-style: normal; font-weight: 850; }
footer { padding: 2.6rem 0; background: #070c0e; color: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 2rem; align-items: center; }
.footer-inner div strong, .footer-inner div span { display: block; }
.footer-inner div span { color: #95a4a1; font-size: .9rem; }
.footer-inner p { margin: 0; text-align: right; color: #c8d2d0; }
footer a { color: #a7e572; font-weight: 900; }
@media (max-width: 1020px) {
  .benefit-grid { grid-template-columns: repeat(2,1fr); }
  .course-grid { grid-template-columns: 1fr 1fr; }
  .course-card:last-child { grid-column: 1 / -1; }
  .resource-grid { grid-template-columns: repeat(3,1fr); }
}
@media (max-width: 760px) {
  .header-inner { align-items: flex-start; flex-direction: column; padding: .8rem 0; }
  nav { gap: .75rem 1rem; }
  .hero { min-height: 640px; }
  .hero-shade { background: linear-gradient(90deg, rgba(5,10,12,.94), rgba(5,10,12,.66)); }
  .benefit-grid, .course-grid, .science-grid, .habits-grid, .resource-grid { grid-template-columns: 1fr; }
  .course-card:last-child { grid-column: auto; }
  .science-grid, .habits-grid { gap: 2.5rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-inner p { text-align: left; }
}
@media (max-width: 520px) {
  .container { width: min(var(--container), calc(100% - 1.2rem)); }
  .hero h1 { font-size: 3rem; }
  .lead { font-size: 1rem; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
  .benefit-grid { grid-template-columns: 1fr; }
  .benefit-grid article { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.1); }
  .section, .science, .resources { padding: 4.5rem 0; }
}