:root {
  --ink: #14211d;
  --muted: #5e6b64;
  --line: #d9e0dc;
  --paper: #f7f8f5;
  --white: #ffffff;
  --fern: #1f5f4b;
  --clay: #ad4f2f;
  --sky: #d8edf0;
  --gold: #c6923e;
  --shadow: 0 18px 44px rgba(18, 33, 29, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

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

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.65rem 0.9rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3.25rem);
  color: var(--white);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-scrolled {
  color: var(--ink);
  background: rgba(247, 248, 245, 0.94);
  box-shadow: 0 8px 28px rgba(18, 33, 29, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-weight: 800;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  color: var(--ink);
  background: var(--white);
  border-radius: 50%;
  font-size: 0.8rem;
  letter-spacing: 0;
}

.site-header.is-scrolled .brand-mark {
  color: var(--white);
  background: var(--fern);
}

nav {
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 2vw, 1.35rem);
  font-size: 0.95rem;
  font-weight: 700;
}

nav a {
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
}

.hero picture,
.hero img,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero img {
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(9, 24, 21, 0.86), rgba(9, 24, 21, 0.42), rgba(9, 24, 21, 0.08)),
    linear-gradient(0deg, rgba(9, 24, 21, 0.84), rgba(9, 24, 21, 0.05) 42%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(850px, calc(100% - clamp(2rem, 14vw, 13rem)));
  margin: 0 clamp(1rem, 7vw, 6.5rem) clamp(3rem, 10vh, 6.5rem);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--clay);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero .eyebrow,
.cta-section .eyebrow {
  color: #ffc66d;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4.2rem, 12vw, 10rem);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.1rem, 4.5vw, 4.15rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 0.8rem;
  font-size: 1.18rem;
  line-height: 1.2;
}

.hero-copy {
  width: min(690px, 100%);
  margin: 1.25rem 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.1rem;
  border: 1px solid transparent;
  border-radius: 0.45rem;
  font-weight: 850;
  text-decoration: none;
}

.button.primary {
  color: var(--ink);
  background: #ffc66d;
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.trust-strip {
  position: relative;
  z-index: 4;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  width: min(1180px, calc(100% - 2rem));
  margin: -2.2rem auto 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--line);
  box-shadow: var(--shadow);
}

.trust-strip div {
  min-height: 7.2rem;
  padding: 1.3rem;
  background: var(--white);
}

.trust-strip strong {
  display: block;
  color: var(--fern);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1;
}

.trust-strip span {
  display: block;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.93rem;
}

.section {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(4rem, 9vw, 7rem) 0;
}

.intro-grid,
.proof-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.78fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.section-copy p,
.route-content p,
.cta-section p {
  color: var(--muted);
  font-size: 1.08rem;
}

.entity-section {
  padding-bottom: 0;
}

.entity-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--line);
}

.entity-grid div {
  min-height: 13rem;
  padding: 1.2rem;
  background: var(--white);
}

.entity-grid dt {
  margin: 0 0 0.8rem;
  color: var(--fern);
  font-weight: 900;
  line-height: 1.2;
}

.entity-grid dd {
  margin: 0;
  color: var(--muted);
}

.authority-panel,
.experience-card,
.article-grid article {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
  box-shadow: 0 12px 28px rgba(18, 33, 29, 0.06);
}

.authority-panel {
  padding: 1.5rem;
}

.authority-panel ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.authority-panel li + li {
  margin-top: 0.75rem;
}

.route-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr);
  min-height: 620px;
  background: var(--sky);
}

.route-media img {
  width: 100%;
  height: 100%;
  min-height: 420px;
  object-fit: cover;
}

.route-content {
  display: grid;
  align-content: center;
  padding: clamp(2rem, 7vw, 6rem);
}

.route-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.5rem;
}

.route-list span {
  padding: 0.55rem 0.75rem;
  border: 1px solid rgba(31, 95, 75, 0.28);
  border-radius: 999px;
  color: var(--fern);
  background: rgba(255, 255, 255, 0.68);
  font-weight: 800;
  font-size: 0.92rem;
}

.section-heading {
  width: min(780px, 100%);
  margin-bottom: 2rem;
}

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

.article-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.research-library-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  margin-bottom: 1.4rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
}

.research-library-callout strong {
  display: block;
  color: var(--fern);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
  line-height: 1;
}

.research-library-callout p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.experience-card {
  min-height: 250px;
  padding: 1.45rem;
}

.card-kicker {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--clay);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.experience-card p,
.article-grid p {
  margin: 0;
  color: var(--muted);
}

.method-section {
  color: var(--white);
  background: var(--fern);
}

.method-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(4rem, 9vw, 7rem) 0;
}

.method-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: method;
}

.method-list li {
  position: relative;
  padding: 1.2rem 1.2rem 1.2rem 4rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
}

.method-list li::before {
  position: absolute;
  left: 1.2rem;
  top: 1.2rem;
  counter-increment: method;
  content: counter(method);
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  color: var(--ink);
  background: #ffc66d;
  border-radius: 50%;
  font-weight: 900;
}

.method-list strong {
  display: block;
}

.article-grid article {
  overflow: hidden;
}

.article-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.article-grid h3,
.article-grid p {
  padding-inline: 1.1rem;
}

.article-grid a {
  color: inherit;
  text-decoration: none;
}

.article-grid a:hover {
  color: var(--fern);
  text-decoration: underline;
  text-underline-offset: 0.2rem;
}

.article-grid h3 {
  margin-top: 1.15rem;
}

.article-grid p {
  padding-bottom: 1.3rem;
}

.source-list {
  display: grid;
  gap: 0.7rem;
}

.faq-section {
  padding-top: 0;
}

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

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
  box-shadow: 0 12px 28px rgba(18, 33, 29, 0.05);
}

.faq-list summary {
  cursor: pointer;
  padding: 1rem 1.15rem;
  color: var(--fern);
  font-weight: 900;
}

.faq-list p {
  margin: 0;
  padding: 0 1.15rem 1.15rem;
  color: var(--muted);
}

.source-list a {
  display: flex;
  align-items: center;
  min-height: 3.2rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: var(--white);
  color: var(--fern);
  font-weight: 850;
  text-decoration: none;
}

.source-list a:hover {
  border-color: var(--fern);
}

.cta-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto clamp(4rem, 8vw, 6rem);
  padding: clamp(2rem, 5vw, 3.5rem);
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(20, 33, 29, 0.92), rgba(20, 33, 29, 0.58)),
    url("https://commons.wikimedia.org/wiki/Special:FilePath/Rice_Fields_-_Sapa,_Vietnam_-_Landscape_photography_-_Flickr_-_Giuseppe_Milo_(www.milo.photography).jpg?width=1600") center / cover;
  border-radius: 0.55rem;
}

.cta-section > div {
  width: min(760px, 100%);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

.article-body {
  background: var(--paper);
}

.article-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  min-height: 620px;
  color: var(--white);
  background: var(--ink);
}

.article-hero-text {
  display: grid;
  align-content: end;
  padding: 7rem clamp(1rem, 5vw, 4.5rem) clamp(2.5rem, 6vw, 5rem);
}

.article-hero-text h1 {
  font-size: clamp(3rem, 6vw, 6.4rem);
}

.article-hero-text p {
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.16rem;
}

.article-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.5rem;
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.9rem;
}

.article-main {
  width: min(860px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) 0;
}

.article-main h2 {
  margin-top: 2.8rem;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

.article-main h3 {
  margin-top: 1.8rem;
}

.article-main p,
.article-main li {
  color: var(--muted);
  font-size: 1.05rem;
}

.article-main a {
  color: var(--fern);
  font-weight: 800;
}

.answer-box,
.research-box,
.source-box {
  margin: 2rem 0;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--white);
}

.answer-box strong,
.research-box strong,
.source-box strong {
  color: var(--fern);
}

.checklist {
  display: grid;
  gap: 0.8rem;
  padding-left: 1.2rem;
}

.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  width: min(860px, calc(100% - 2rem));
  margin: 0 auto 4rem;
}

.article-nav a {
  color: var(--fern);
  font-weight: 850;
  text-decoration: none;
}

.article-nav a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2rem;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
  }

  nav {
    display: none;
  }

  .trust-strip,
  .entity-grid,
  .experience-grid,
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-grid,
  .proof-section,
  .route-section,
  .method-inner,
  .article-hero {
    grid-template-columns: 1fr;
  }

  .route-section {
    min-height: 0;
  }

  .cta-section,
  .research-library-callout,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .hero {
    min-height: 88vh;
  }

  h1 {
    font-size: clamp(3.15rem, 17vw, 4.4rem);
  }

  .hero-content {
    margin: 0 1rem 2.5rem;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .trust-strip,
  .entity-grid,
  .experience-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .trust-strip {
    margin-top: 0;
    width: 100%;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .route-content {
    padding: 2rem 1rem;
  }

  .method-list li {
    padding: 1rem 1rem 1rem 3.6rem;
  }
}