/* Base styles — proofindata.com v2 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--logo-blue);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

.wrap {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 24px;
}

.wrap--narrow {
  max-width: var(--wrap-narrow);
}

/* Header */
.site-header {
  background: var(--navy);
  padding: 18px 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-header__logo img {
  height: 40px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--on-navy);
  font-size: var(--fs-small);
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: #ffffff;
}

/* Sections */
.section {
  padding: var(--space-section) 0;
}

.section--navy {
  background: var(--navy-deep);
  color: #ffffff;
}

.section h2 {
  font-size: var(--fs-h2);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

/* Hero placeholder */
.hero {
  background: var(--navy-deep);
  color: #ffffff;
  padding: var(--space-section) 0;
}

.hero h1 {
  font-size: var(--fs-hero);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.4em;
}

.hero p {
  color: var(--on-navy);
  max-width: 34em;
  margin: 0;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 24px 26px;
}

/* Buttons */
.button {
  display: inline-block;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  font-size: var(--fs-small);
  padding: 13px 26px;
  border-radius: 999px;
}

.button:hover {
  color: #ffffff;
  filter: brightness(1.08);
}

.button--ghost {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* Footer */
.site-footer {
  background: var(--navy);
  color: var(--on-navy-soft);
  padding: 44px 0;
  font-size: var(--fs-small);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
}

.site-footer a {
  color: var(--on-navy);
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer__tagline {
  max-width: 34em;
}

/* ============ Homepage: hero ============ */
.hero--home {
  background: linear-gradient(180deg, var(--navy-deep) 0%, var(--navy) 100%);
  padding: calc(var(--space-section) * 1.2) 0;
}

.hero__kicker {
  color: var(--accent);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 1.2em;
}

.hero__thesis {
  font-size: 1.1rem;
  max-width: 38em;
}

.hero__scroll-hint {
  margin-top: 2.2em;
}

.hero__scroll-hint a {
  color: var(--accent);
  font-weight: 600;
}

/* ============ Timeline ============ */
.section--timeline {
  background: var(--page);
  overflow-x: hidden;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--rule) 0%, var(--accent) 100%);
}

.timeline__era {
  position: relative;
  padding: 0 0 2.6rem 44px;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline__era.is-visible {
  opacity: 1;
  transform: none;
}

.timeline__marker {
  position: absolute;
  left: 3px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--logo-blue);
}

.timeline__era--current .timeline__marker {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(0, 176, 228, 0.18);
}

.timeline__card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px 26px;
}

.timeline__era--current .timeline__card {
  border-color: var(--accent);
  border-width: 2px;
}

.timeline__years {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-small);
  margin: 0 0 0.3em;
}

.timeline__label {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

.timeline__body {
  margin: 0;
  color: var(--ink-soft);
}

.timeline__payoff {
  margin-top: 0.6rem;
  border-left: 4px solid var(--accent);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline__payoff.is-visible {
  opacity: 1;
  transform: none;
}

.timeline__payoff h2 {
  margin-top: 0;
}

.timeline__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 0;
}

@media (min-width: 760px) {
  .timeline::before {
    left: 50%;
    margin-left: -1px;
  }
  .timeline__era {
    width: 50%;
    padding: 0 40px 2.8rem 0;
  }
  .timeline__era .timeline__marker {
    left: auto;
    right: -9px;
  }
  .timeline__era:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 2.8rem 40px;
  }
  .timeline__era:nth-child(even) .timeline__marker {
    right: auto;
    left: -9px;
  }
}

/* ============ Writing / services / proof sections ============ */
.section__sub {
  color: var(--ink-faint);
  margin-top: -0.4em;
}

.writing-grid,
.services-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  margin: 1.4rem 0;
}

.writing-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--rule);
}

.writing-card:hover {
  border-color: var(--accent);
  color: inherit;
}

.writing-card h3 {
  margin: 0.3em 0;
  font-size: 1.05rem;
  line-height: 1.4;
}

.writing-card__source {
  color: var(--accent);
  font-size: var(--fs-small);
  font-weight: 600;
  margin: 0;
}

.writing-card__date {
  color: var(--ink-faint);
  font-size: var(--fs-small);
  margin: 0;
}

.service-card h3 {
  margin: 0 0 0.4em;
  font-size: 1.05rem;
}

.service-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.logo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 28px 36px;
  align-items: center;
  margin: 1.6rem 0 2rem;
}

.logo-row img {
  height: 30px;
  width: auto;
  opacity: 0.75;
}

.testimonial-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.testimonial-card {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.testimonial-card blockquote {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.testimonial-card figcaption {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: var(--fs-small);
}

.testimonial-card img {
  border-radius: 50%;
}

/* ============ Essay pages ============ */
.prose h2 {
  font-size: 1.4rem;
  margin: 1.6em 0 0.5em;
}

.prose p {
  margin: 0 0 1.1em;
}

.essay-kicker {
  margin: 0 0 0.4em;
}

.essay-kicker a {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.essay-standfirst {
  font-size: 1.1rem;
  color: var(--ink-soft);
}

.essay-date {
  color: var(--ink-faint);
  font-size: var(--fs-small);
}

.hero--compact {
  padding: calc(var(--space-section) * 0.7) 0;
}

/* ============ Writing index ============ */
.byline-feature {
  margin: 1.4rem 0;
  border-left: 4px solid var(--accent);
}

.byline-feature h3 {
  margin: 0.2em 0 0;
  font-size: 1.2rem;
}

.byline-feature a {
  color: var(--ink);
}

.byline-feature a:hover {
  color: var(--accent);
}

.byline-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.byline-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  justify-content: space-between;
  align-items: baseline;
}

.byline-list a {
  color: var(--ink);
  font-weight: 500;
  flex: 1 1 60%;
}

.byline-list a:hover {
  color: var(--accent);
}

.byline-list__meta {
  color: var(--ink-faint);
  font-size: var(--fs-small);
  white-space: nowrap;
}

/* ============ Research index ============ */
.research-list {
  display: grid;
  gap: 18px;
  margin-top: 1.6rem;
}

.research-item {
  display: block;
  color: inherit;
}

.research-item:hover {
  border-color: var(--accent);
  color: inherit;
}

.research-item h2 {
  margin: 0 0 0.35em;
  font-size: 1.25rem;
}

.research-item p {
  margin: 0 0 0.7em;
  color: var(--ink-soft);
}

.research-item__more {
  color: var(--accent);
  font-weight: 600;
  font-size: var(--fs-small);
}

.essay-footer {
  color: var(--ink-faint);
  font-size: 0.95rem;
}

/* ============ Shorts strip ============ */
.shorts-strip {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.shorts-strip li {
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  justify-content: space-between;
  align-items: baseline;
}

.shorts-strip a {
  color: var(--ink);
  font-weight: 500;
  flex: 1 1 60%;
}

.shorts-strip a:hover {
  color: var(--accent);
}