* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #222;
  background: #fff;
  line-height: 1.55;
}

a {
  color: #04306C;
  text-decoration: none;
}

a:hover {
  color: #8B0000;
}

.site-header {
  background: #0d2f5f;
  color: #fff;
}

.site-header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-header a {
  color: #fff;
}

.author-link {
  font-weight: 700;
}

.personal-link {
  font-size: 0.92rem;
  opacity: 0.9;
}

.hero {
  background: #eef2f6;
  border-bottom: 1px solid #d5dce3;
}

.hero-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px 24px 42px;
}

.eyebrow {
  margin: 0 0 8px;
  color: #5f6f82;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  color: #04306C;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.08;
}

.subtitle {
  margin: 12px 0 0;
  font-size: 1.25rem;
  color: #44576b;
}

.author {
  margin: 24px 0 0;
  font-weight: 700;
}

.affiliation {
  margin: 2px 0 0;
  color: #667788;
  font-size: 0.95rem;
}

.page-nav {
  border-bottom: 1px solid #d9dee4;
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.page-nav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.page-nav a {
  display: block;
  padding: 11px 18px 10px 0;
  margin-right: 24px;
  font-size: 0.94rem;
  font-weight: 700;
}

.content {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 24px 48px;
}

section {
  margin-bottom: 34px;
  scroll-margin-top: 80px;
}

h2 {
  margin: 0 0 12px;
  color: #04306C;
  font-size: 1.45rem;
}

h3 {
  margin: 0 0 8px;
  color: #04306C;
  font-size: 1.05rem;
}

p {
  margin: 0 0 12px;
}

.intro {
  max-width: 850px;
}

.video-box {
  max-width: 760px;
  margin: 16px auto 8px;
}

.video-placeholder {
  min-height: 360px;
  border: 1px solid #b9c3cd;
  background: #eef2f6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.video-title {
  font-weight: 700;
  color: #04306C;
  font-size: 1.15rem;
}

.video-responsive {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}

.video-responsive iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.center {
  text-align: center;
}

.small {
  font-size: 0.9rem;
  color: #5c6772;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.step-card {
  position: relative;
  border: 1px solid #d0d6dc;
  background: #fafbfc;
  padding: 18px 18px 16px 54px;
}

.step-number {
  position: absolute;
  left: 16px;
  top: 16px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: #04306C;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  font-weight: 700;
}

.step-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.resource-card {
  display: block;
  border: 1px solid #cbd3da;
  background: #fff;
  padding: 18px;
  color: #222;
}

.resource-card:hover {
  border-color: #04306C;
  color: #222;
}

.resource-label {
  margin: 0 0 4px;
  color: #6b7785;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card-link {
  display: inline-block;
  margin-top: 6px;
  color: #04306C;
  font-weight: 700;
}

.evidence {
  padding: 20px;
  background: #f4f6f8;
  border-left: 5px solid #04306C;
}

.result-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 18px 0;
}

.result-strip > div {
  background: #fff;
  border: 1px solid #d0d6dc;
  padding: 14px;
  text-align: center;
}

.result-number {
  display: block;
  color: #04306C;
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.1;
}

.result-label {
  display: block;
  margin-top: 4px;
  color: #5e6a76;
  font-size: 0.82rem;
}

.takeaway {
  margin-top: 16px;
  padding: 14px 16px;
  background: #04306C;
  color: #fff;
  font-weight: 700;
}

.citation-box {
  padding-top: 18px;
  border-top: 1px solid #d3d8dd;
}

footer {
  border-top: 1px solid #d5dce3;
  background: #f6f7f8;
}

.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px 24px 24px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 0.88rem;
  color: #66727e;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 760px) {
  .site-header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .steps-grid,
  .resource-grid,
  .result-strip {
    grid-template-columns: 1fr;
  }

  .page-nav-inner {
    padding-top: 4px;
    padding-bottom: 4px;
  }

  .page-nav a {
    padding-top: 7px;
    padding-bottom: 7px;
    margin-right: 14px;
  }

  .video-placeholder {
    min-height: 240px;
  }
}