:root {
  --font-hero: "Space Grotesk", Inter, system-ui, sans-serif;
  --font-display: "IBM Plex Sans", Inter, system-ui, sans-serif;
  --font-body: "IBM Plex Sans", Inter, system-ui, sans-serif;
  --bg: #07110f;
  --bg-soft: #0d1c18;
  --panel: #122620;
  --panel-light: #18342c;
  --text: #f0f4ef;
  --muted: #b7c7be;
  --cream: #f5f0df;
  --accent: #9fe870;
  --accent-2: #67d6c5;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.65;
  background:
    radial-gradient(circle at 10% 0, rgba(103, 214, 197, 0.15), transparent 32rem),
    radial-gradient(circle at 92% 8%, rgba(159, 232, 112, 0.11), transparent 28rem),
    var(--bg);
}

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

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  background: rgba(7, 17, 15, 0.84);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand,
.site-nav,
.nav-toggle,
.eyebrow,
.button,
.section-label {
  font-family: var(--font-hero);
}

.brand {
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand span {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  background: transparent;
}

.shell {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(860px, calc(100vh - 65px));
  align-items: end;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-media,
.hero-media::after,
.hero-media img,
.hero-media video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media img,
.hero-media video {
  object-fit: cover;
}

.hero-media::after {
  content: "";
  background:
    linear-gradient(90deg, rgba(3, 10, 8, 0.94) 0%, rgba(3, 10, 8, 0.65) 48%, rgba(3, 10, 8, 0.22) 100%),
    linear-gradient(0deg, var(--bg), transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(5rem, 12vw, 9rem) 0;
}

.eyebrow,
.section-label {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: var(--font-hero);
  letter-spacing: -0.045em;
}

h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(3.4rem, 9vw, 7.5rem);
  line-height: 0.9;
}

.hero-copy {
  max-width: 700px;
  margin: 1.7rem 0 0;
  color: var(--cream);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.78rem 1.2rem;
  color: #0b1813;
  background: var(--accent);
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  color: var(--text);
  border-color: var(--line);
  background: rgba(7, 17, 15, 0.55);
}

.section {
  padding: clamp(4.5rem, 10vw, 8rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1.2fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
  margin-bottom: 3rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.3rem, 6vw, 5rem);
  line-height: 0.98;
}

.section-heading p,
.body-copy {
  margin-top: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  min-height: 250px;
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(24, 52, 44, 0.72), rgba(10, 25, 21, 0.88));
  box-shadow: var(--shadow);
}

.card-number {
  color: var(--accent-2);
  font-family: var(--font-hero);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.card h3 {
  margin: 2.5rem 0 0.8rem;
  font-size: 1.55rem;
}

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

.loop {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
  counter-reset: step;
}

.loop-step {
  position: relative;
  padding: 1.2rem;
  border-top: 2px solid var(--accent);
  background: rgba(18, 38, 32, 0.55);
}

.loop-step::after {
  content: "→";
  position: absolute;
  top: 1rem;
  right: -0.7rem;
  z-index: 2;
  color: var(--accent);
}

.loop-step:last-child::after {
  content: "";
}

.loop-step strong {
  display: block;
  font-family: var(--font-hero);
  font-size: 1.05rem;
}

.loop-step span {
  display: block;
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.video-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1rem;
}

.video-shell {
  position: relative;
  display: grid;
  min-height: 420px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.video-shell img,
.video-shell video {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-pending {
  position: relative;
  z-index: 2;
  max-width: 260px;
  padding: 1rem;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--cream);
  background: rgba(7, 17, 15, 0.78);
  backdrop-filter: blur(10px);
}

.quote {
  max-width: 940px;
  margin: 0;
  font-family: var(--font-hero);
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.page-hero {
  padding: clamp(6rem, 14vw, 11rem) 0 clamp(4rem, 10vw, 8rem);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  max-width: 960px;
}

.page-hero .lede {
  max-width: 760px;
  margin-top: 1.8rem;
  color: var(--muted);
  font-size: 1.25rem;
}

.principle-list {
  display: grid;
  gap: 1rem;
}

.principle {
  display: grid;
  grid-template-columns: 90px minmax(0, 0.8fr) minmax(320px, 1.2fr);
  gap: 2rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.principle-index {
  color: var(--accent);
  font-family: var(--font-hero);
  font-weight: 800;
}

.principle h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.principle p {
  margin: 0;
  color: var(--muted);
}

.evidence-note {
  padding: 2rem;
  border: 1px solid rgba(159, 232, 112, 0.35);
  border-radius: var(--radius);
  background: rgba(159, 232, 112, 0.08);
}

.references {
  margin: 0;
  padding: 0;
  list-style: none;
}

.references li {
  padding: 1.2rem 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.references a {
  color: var(--accent-2);
  text-underline-offset: 0.2em;
}

.site-footer {
  padding: 2.5rem 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    background: rgba(7, 17, 15, 0.97);
    border-bottom: 1px solid var(--line);
  }

  .site-nav[data-open] {
    display: flex;
  }

  .section-heading,
  .principle,
  .video-grid {
    grid-template-columns: 1fr;
  }

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

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

  .loop-step::after {
    content: "↓";
    top: auto;
    right: 1rem;
    bottom: -0.9rem;
  }

  .principle {
    gap: 0.8rem;
  }

  .footer-row {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}