:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5d687a;
  --line: #d9e0ea;
  --panel: #ffffff;
  --soft: #f3f6f9;
  --teal: #0f766e;
  --teal-dark: #115e59;
  --amber: #b7791f;
  --blue: #2563eb;
  --charcoal: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fbfcfe;
  font: 16px/1.55 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2,
h3 {
  margin: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  min-height: 68px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(217, 224, 234, 0.86);
  background: rgba(251, 252, 254, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 7px;
  color: white;
  background: var(--teal);
}

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

nav a:hover {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--teal);
  border-radius: 7px;
  color: white;
  background: var(--teal);
  font-weight: 700;
}

.hero {
  position: relative;
  min-height: calc(100vh - 68px);
  display: grid;
  align-items: center;
  padding: 72px max(24px, calc((100vw - 1180px) / 2));
  color: white;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("/assets/trainer-preview.png");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(12, 18, 30, 0.76);
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
}

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

.hero .eyebrow {
  color: #f8c36b;
}

h1 {
  width: min(900px, 100%);
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.06;
  letter-spacing: 0;
}

h3 {
  font-size: 22px;
  line-height: 1.18;
}

.hero-text {
  width: min(700px, 100%);
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.cta-note {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 7px;
  font-weight: 800;
}

.button.primary {
  background: var(--teal);
  color: white;
}

.button.primary:hover,
.nav-cta:hover {
  background: var(--teal-dark);
  color: white;
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.52);
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.strip div {
  display: grid;
  gap: 4px;
  padding: 22px max(24px, calc((100vw - 1180px) / 2));
  background: white;
}

.strip strong {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--teal);
}

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

.section {
  width: min(1180px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 86px 0;
}

#trade-packs,
#practice-loop,
#open-source {
  scroll-margin-top: 88px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1fr);
  gap: 54px;
  align-items: start;
}

.split.reverse {
  grid-template-columns: minmax(360px, 1fr) minmax(0, 0.9fr);
}

.split.reverse > div {
  order: 2;
}

.split p,
.section-heading p,
.preview-copy p,
.final-cta p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 18px;
}

.process-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.process-list li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.process-list li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  grid-row: 1 / span 2;
  border-radius: 7px;
  background: #e7f5f3;
  color: var(--teal-dark);
  font-weight: 900;
}

.process-list strong,
.process-list span {
  grid-column: 2;
}

.process-list strong {
  font-size: 18px;
}

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

.section-heading {
  width: min(760px, 100%);
  margin-bottom: 28px;
}

.pack-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.pack {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.pack.featured {
  border-color: #8bd2c8;
  background: #effaf8;
}

.pack span {
  width: max-content;
  padding: 4px 8px;
  border-radius: 7px;
  background: #edf2ff;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.pack.featured span {
  background: #d9f4ef;
  color: var(--teal-dark);
}

.pack p {
  color: var(--muted);
}

.trainer-preview {
  display: grid;
  grid-template-columns: minmax(280px, 0.65fr) minmax(420px, 1fr);
  gap: 36px;
  align-items: center;
  width: 100%;
  padding-inline: max(24px, calc((100vw - 1180px) / 2));
  background: var(--charcoal);
  color: white;
}

.trainer-preview .eyebrow {
  color: #f8c36b;
}

.trainer-preview p {
  color: rgba(255, 255, 255, 0.78);
}

.trainer-preview img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
}

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

.check-list li {
  position: relative;
  padding: 14px 16px 14px 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--teal);
}

.final-cta {
  width: min(900px, calc(100vw - 48px));
  text-align: center;
}

.final-cta .button {
  margin-top: 28px;
}

footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  padding: 28px 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer a {
  color: var(--teal-dark);
  font-weight: 700;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

@media (max-width: 920px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding-block: 16px;
  }

  nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 720px;
  }

  .hero::after {
    background: rgba(12, 18, 30, 0.82);
  }

  .strip,
  .split,
  .split.reverse,
  .trainer-preview,
  .pack-grid {
    grid-template-columns: 1fr;
  }

  .split.reverse > div {
    order: 0;
  }

  .section {
    width: min(100% - 32px, 720px);
    padding: 64px 0;
  }

  .trainer-preview {
    width: 100%;
    padding: 64px 16px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .brand {
    align-items: flex-start;
  }

  nav {
    gap: 12px;
    font-size: 13px;
  }

  .hero {
    min-height: 680px;
    padding: 54px 18px;
  }

  h1 {
    font-size: 42px;
  }

  .hero-text,
  .split p,
  .section-heading p,
  .preview-copy p,
  .final-cta p {
    font-size: 16px;
  }

  .hero-actions,
  footer {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }

  .strip div {
    padding: 18px;
  }

  .pack {
    min-height: 0;
  }
}