@font-face {
  font-family: "InterVar";
  src: local("Inter"), local("Arial");
}

:root {
  --ink: #102235;
  --muted: #596778;
  --paper: #fbf7ee;
  --surface: #fffdf8;
  --line: #ded5c4;
  --moss: #386a55;
  --blue: #2a6784;
  --coral: #d96d55;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: InterVar, Arial, Helvetica, sans-serif;
}

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

main {
  overflow: hidden;
}

.site-nav {
  align-items: center;
  background: rgb(251 247 238 / 92%);
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  grid-template-columns: auto 1fr auto;
  left: 0;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  position: fixed;
  right: 0;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 0.7rem;
}

.brand img {
  display: block;
  height: 2.55rem;
  width: 12.8rem;
}

.brand span {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.nav-links {
  display: flex;
  gap: clamp(0.8rem, 2vw, 1.8rem);
  justify-content: center;
}

.nav-links a,
.nav-cta {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.nav-cta {
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  padding: 0.7rem 1rem;
}

.hero {
  display: grid;
  gap: clamp(2rem, 5vw, 5rem);
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1fr);
  min-height: 100vh;
  padding: clamp(7rem, 12vw, 10rem) clamp(1.1rem, 4vw, 4rem) 4rem;
}

.hero-copy {
  align-self: center;
  max-width: 690px;
}

.eyebrow {
  color: var(--moss);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.14em;
  margin: 0 0 0.9rem;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: 0;
  line-height: 0.96;
  margin: 0;
}

h1 {
  font-size: clamp(3.2rem, 8vw, 7.4rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(2.2rem, 4.8vw, 4.8rem);
  max-width: 12ch;
}

h3 {
  font-size: clamp(1.4rem, 2vw, 2rem);
  line-height: 1.04;
}

p {
  color: var(--muted);
  font-size: clamp(1rem, 1.25vw, 1.15rem);
  line-height: 1.75;
}

.hero-lede {
  color: var(--ink);
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  line-height: 1.35;
}

.hero-form,
.signup-card {
  margin-top: 2rem;
}

label {
  display: block;
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 0.45rem;
}

.inline-form {
  display: flex;
  max-width: 660px;
}

input {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px 0 0 999px;
  color: var(--ink);
  flex: 1;
  font: inherit;
  min-width: 0;
  padding: 1rem 1.1rem;
}

button {
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 0 999px 999px 0;
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 850;
  padding: 1rem 1.25rem;
}

.form-message {
  font-size: 0.92rem;
  line-height: 1.45;
  margin-top: 0.75rem;
}

.form-message.success {
  color: var(--moss);
  font-weight: 800;
}

.hero-image {
  align-self: center;
  aspect-ratio: 16 / 9;
  background: #f5efe4;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 30px 80px rgb(16 34 53 / 16%);
  margin: 0;
  overflow: hidden;
}

.hero-image img {
  display: block;
  height: 100%;
  object-fit: contain;
  width: 100%;
}

section {
  padding: clamp(4.5rem, 9vw, 8rem) clamp(1.1rem, 4vw, 4rem);
}

.definition {
  background: var(--surface);
}

.definition h2,
.topics h2,
.field-notes h2 {
  max-width: 850px;
}

.definition-grid {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2.5rem;
}

.method {
  background: #f2f7f4;
  display: grid;
  gap: 3rem;
  grid-template-columns: 0.65fr 1fr;
}

.method > div:first-child p {
  max-width: 540px;
}

.method-steps {
  display: grid;
  gap: 1rem;
}

.method-steps article,
.topic-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.method-steps span {
  color: var(--coral);
  display: block;
  font-weight: 900;
  margin-bottom: 1rem;
}

.topics {
  background: var(--paper);
}

.topic-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 2.5rem;
}

.topic-grid article p {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  margin-top: 0;
  text-transform: uppercase;
}

.topic-grid article span {
  color: var(--muted);
  display: block;
  line-height: 1.6;
  margin-top: 1rem;
}

.field-notes {
  background: var(--ink);
  color: white;
  display: grid;
  gap: 3rem;
  grid-template-columns: 0.72fr 1fr;
}

.field-notes h2,
.field-notes .eyebrow {
  color: white;
}

.note-list {
  display: grid;
  gap: 0.75rem;
}

.note-list a {
  align-items: center;
  border-bottom: 1px solid rgb(255 255 255 / 18%);
  color: white;
  display: flex;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.35rem, 2.5vw, 2.35rem);
  justify-content: space-between;
  line-height: 1.08;
  padding: 1rem 0;
}

.note-list span {
  color: #c8d7d7;
  font-family: InterVar, Arial, Helvetica, sans-serif;
  font-size: 0.8rem;
  font-weight: 800;
  margin-left: 1rem;
  white-space: nowrap;
}

.evidence {
  background: var(--surface);
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 0.72fr 1fr;
}

.evidence p {
  margin-top: 0;
}

.evidence ul {
  color: var(--ink);
  display: grid;
  gap: 0.75rem;
  font-size: 1.05rem;
  font-weight: 750;
  line-height: 1.45;
  list-style: none;
  margin: 0;
  padding: 0;
}

.evidence li {
  border-left: 4px solid var(--coral);
  padding-left: 1rem;
}

.about {
  background: #eef3f8;
}

.about p {
  max-width: 760px;
}

.newsletter {
  align-items: center;
  background: var(--paper);
  display: grid;
  gap: 3rem;
  grid-template-columns: 1fr minmax(320px, 520px);
}

.newsletter h2 {
  max-width: 680px;
}

.signup-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: 0 24px 70px rgb(16 34 53 / 11%);
}

.signup-card input,
.signup-card button {
  border-radius: 999px;
  display: block;
  width: 100%;
}

.signup-card button {
  margin-top: 0.8rem;
}

@media (max-width: 980px) {
  .site-nav {
    grid-template-columns: 1fr auto;
  }

  .nav-links {
    display: none;
  }

  .hero,
  .method,
  .field-notes,
  .evidence,
  .newsletter {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

@media (max-width: 640px) {
  .site-nav {
    padding: 0.75rem 1rem;
  }

  .nav-cta {
    padding: 0.65rem 0.75rem;
  }

  h1 {
    font-size: clamp(3rem, 16vw, 4.6rem);
  }

  .inline-form {
    display: grid;
    gap: 0.65rem;
  }

  input,
  button {
    border-radius: 999px;
    width: 100%;
  }

  .definition-grid,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .note-list a {
    align-items: flex-start;
    display: grid;
    gap: 0.55rem;
  }

  .note-list span {
    margin-left: 0;
  }
}