:root {
  color-scheme: light;
  --paper: #f3f1eb;
  --paper-deep: #e9e6de;
  --white: #fffefa;
  --ink: #171715;
  --ink-soft: #3f3e3a;
  --muted: #74716a;
  --line: #c9c5bb;
  --line-dark: #363632;
  --accent: #a33b32;
  --accent-soft: #ead6d0;
  --dark: #191917;
  --dark-soft: #aaa69d;
  --radius: 6px;
  --wrap: min(1180px, calc(100% - 40px));
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 68px;
  padding: 0 max(20px, calc((100vw - 1180px) / 2));
  background: rgba(243, 241, 235, 0.92);
  border-bottom: 1px solid rgba(23, 23, 21, 0.14);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: max-content;
}

.brand strong {
  font-size: 18px;
  letter-spacing: -0.04em;
}

.brand span {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 30px;
  font-size: 13px;
}

.main-nav a,
.header-link {
  transition: color 160ms ease;
}

.main-nav a:hover,
.header-link:hover,
.text-link:hover {
  color: var(--accent);
}

.header-link {
  justify-self: end;
  font-size: 13px;
  font-weight: 650;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(340px, 0.65fr);
  gap: clamp(50px, 8vw, 120px);
  align-items: center;
  min-height: calc(100vh - 68px);
  padding: 96px 0;
}

.overline {
  margin: 0 0 26px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.14em;
  line-height: 1.5;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 28px;
  font-size: clamp(56px, 7vw, 104px);
  font-weight: 760;
  letter-spacing: -0.075em;
  line-height: 0.98;
}

h2 {
  margin-bottom: 28px;
  font-size: clamp(42px, 5vw, 70px);
  font-weight: 735;
  letter-spacing: -0.065em;
  line-height: 1.04;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(24px, 2.3vw, 34px);
  font-weight: 690;
  letter-spacing: -0.04em;
  line-height: 1.18;
}

p,
li {
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.78;
}

.hero-statement {
  margin-bottom: 34px;
  color: var(--accent);
  font-size: clamp(26px, 3vw, 42px);
  font-weight: 690;
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.hero-note {
  max-width: 610px;
  margin-bottom: 38px;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 660;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-dark {
  background: var(--ink);
  color: var(--white);
}

.button-quiet:hover {
  background: var(--white);
}

.signal-panel {
  position: relative;
  min-height: 520px;
  padding: 26px;
  overflow: hidden;
  background: var(--dark);
  border-radius: var(--radius);
  color: var(--white);
}

.signal-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.23;
  background-image:
    linear-gradient(var(--line-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-dark) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.signal-panel > * {
  position: relative;
}

.signal-topline {
  display: flex;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--dark-soft);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.signal-lead {
  max-width: 290px;
  margin: 48px 0 70px;
  color: var(--white);
  font-size: 30px;
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.25;
}

.signal-list {
  display: grid;
}

.signal-list > div {
  display: grid;
  grid-template-columns: 40px 1fr;
  align-items: baseline;
  padding: 13px 0;
  border-top: 1px solid var(--line-dark);
}

.signal-list span {
  color: var(--dark-soft);
  font-size: 11px;
}

.signal-list p {
  margin: 0;
  color: var(--white);
  font-size: 14px;
  line-height: 1.5;
}

.signal-foot {
  position: absolute;
  right: 26px;
  bottom: 21px;
  left: 26px;
  margin: 0;
  color: var(--dark-soft);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.truth-strip {
  background: var(--accent);
  color: var(--white);
}

.truth-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  padding: 31px 0;
}

.truth-grid p {
  margin: 0;
  color: var(--white);
  font-size: clamp(20px, 2.2vw, 30px);
  font-weight: 680;
  letter-spacing: -0.035em;
  line-height: 1.3;
}

.truth-grid p:last-child {
  text-align: right;
}

.section {
  padding-top: 150px;
  padding-bottom: 150px;
}

.method-section {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  gap: clamp(60px, 10vw, 140px);
  align-items: start;
}

.section-intro {
  position: sticky;
  top: 118px;
}

.section-intro > p:last-child {
  max-width: 500px;
  margin-bottom: 0;
}

.method-lines {
  border-top: 1px solid var(--line);
}

.method-lines article {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 18px;
  min-height: 180px;
  padding: 35px 0;
  border-bottom: 1px solid var(--line);
}

.method-number {
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
}

.method-lines p {
  margin-bottom: 0;
}

.answer-section,
.about-section {
  background: var(--white);
}

.section-heading-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 390px);
  gap: 60px;
  align-items: end;
  margin-bottom: 70px;
}

.section-heading-row h2 {
  margin-bottom: 0;
}

.section-side-note {
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.answer-list {
  border-top: 1px solid var(--ink);
}

.answer-row {
  display: grid;
  grid-template-columns: 64px 1fr 48px;
  gap: 24px;
  align-items: start;
  padding: 38px 8px 40px 0;
  border-bottom: 1px solid var(--line);
  transition: background 180ms ease, padding 180ms ease;
}

.answer-row:hover {
  padding-left: 18px;
  background: var(--paper);
}

.answer-index,
.answer-label,
.video-kicker {
  color: var(--accent);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.answer-label {
  margin-bottom: 10px;
}

.answer-row h3 {
  margin-bottom: 8px;
}

.answer-row p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.answer-arrow {
  justify-self: end;
  font-size: 24px;
  transition: transform 180ms ease;
}

.answer-row:hover .answer-arrow {
  transform: translate(3px, -3px);
}

.videos-section {
  padding-bottom: 120px;
}

.video-ledger {
  border-top: 1px solid var(--ink);
}

.video-row {
  display: grid;
  grid-template-columns: 115px minmax(0, 1fr) 130px;
  gap: 35px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.video-date {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
}

.video-date strong {
  color: var(--ink);
  font-size: 27px;
  letter-spacing: -0.04em;
}

.video-copy h3 {
  margin-bottom: 8px;
  font-size: 27px;
}

.video-kicker {
  margin-bottom: 8px;
}

.video-copy > p:not(.video-kicker):not(.video-data) {
  max-width: 680px;
  margin-bottom: 10px;
  font-size: 15px;
}

.video-data {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.video-link {
  justify-self: end;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 670;
}

.video-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(60px, 10vw, 150px);
}

.about-copy {
  max-width: 650px;
}

.about-lead {
  color: var(--ink);
  font-size: 24px;
  font-weight: 680;
  letter-spacing: -0.03em;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 58px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.about-facts div {
  display: grid;
  gap: 10px;
}

.about-facts strong {
  font-size: 22px;
  letter-spacing: -0.04em;
}

.about-facts span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.contact-section {
  padding-top: 150px;
  padding-bottom: 95px;
}

.contact-section h2 {
  max-width: 900px;
  font-size: clamp(52px, 7vw, 94px);
}

.contact-lead {
  max-width: 650px;
  font-size: 19px;
}

.contact-line {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin-top: 60px;
  padding: 23px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.contact-line span {
  color: var(--muted);
  font-size: 13px;
}

.contact-line strong {
  font-size: 17px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 30px 0 42px;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
}

.site-footer a {
  color: inherit;
  text-underline-offset: 3px;
}

.article-page {
  background: var(--white);
}

.article-header {
  min-height: 66vh;
  padding: 112px 0 80px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.article-header .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  gap: 80px;
  align-items: end;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 12px;
}

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

.article-header h1 {
  max-width: 850px;
  font-size: clamp(48px, 6vw, 84px);
}

.article-deck {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--accent);
  font-size: clamp(21px, 2.2vw, 30px);
  font-weight: 640;
  line-height: 1.45;
}

.article-meta {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.article-meta p {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 10px;
  font-size: 12px;
  line-height: 1.5;
}

.article-meta span {
  color: var(--muted);
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 720px);
  gap: clamp(60px, 10vw, 140px);
  justify-content: center;
  padding-top: 110px;
  padding-bottom: 130px;
}

.article-toc {
  position: sticky;
  top: 105px;
  align-self: start;
  display: grid;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--ink);
}

.article-toc a {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

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

.article-body > section {
  margin-bottom: 78px;
  scroll-margin-top: 110px;
}

.article-body h2 {
  margin-bottom: 24px;
  font-size: clamp(32px, 4vw, 48px);
}

.article-body h3 {
  margin-top: 34px;
  font-size: 22px;
}

.article-body p,
.article-body li {
  font-size: 18px;
  line-height: 1.9;
}

.article-body ul,
.article-body ol {
  padding-left: 1.25em;
}

.pullquote {
  margin: 50px 0;
  padding: 30px 0 30px 28px;
  border-left: 4px solid var(--accent);
  color: var(--ink);
  font-size: clamp(25px, 3vw, 36px);
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.4;
}

.decision-list {
  margin: 36px 0;
  border-top: 1px solid var(--line);
}

.decision-list > div {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 18px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.decision-list span {
  color: var(--accent);
  font-size: 11px;
  font-weight: 750;
}

.decision-list h3 {
  margin: 0 0 7px;
}

.decision-list p {
  margin: 0;
  font-size: 16px;
}

.video-source {
  padding: 30px;
  background: var(--dark);
  border-radius: var(--radius);
  color: var(--white);
}

.video-source p,
.video-source h3 {
  color: var(--white);
}

.video-source .video-kicker {
  color: #d98679;
}

.video-source .button {
  margin-top: 10px;
  border-color: var(--white);
  color: var(--white);
}

.video-source .button:hover {
  background: var(--white);
  color: var(--ink);
}

.article-next {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 25px;
  align-items: center;
  padding: 30px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.article-next span {
  color: var(--muted);
  font-size: 11px;
}

.article-next strong {
  font-size: 18px;
}

.article-next:hover strong,
.article-next:hover > span:last-child {
  color: var(--accent);
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .main-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 80px 0;
  }

  .signal-panel {
    min-height: 460px;
  }

  .method-section,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .section-intro {
    position: static;
  }

  .section-heading-row {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .video-row {
    grid-template-columns: 90px minmax(0, 1fr);
  }

  .video-link {
    grid-column: 2;
    justify-self: start;
  }

  .article-header .wrap {
    grid-template-columns: 1fr;
  }

  .article-layout {
    grid-template-columns: minmax(0, 720px);
  }

  .article-toc {
    display: none;
  }
}

@media (max-width: 620px) {
  :root {
    --wrap: min(100% - 28px, 1180px);
  }

  .site-header {
    min-height: 60px;
    padding-inline: 14px;
  }

  .brand span {
    display: none;
  }

  .header-link {
    font-size: 12px;
  }

  .hero {
    gap: 54px;
    padding: 62px 0 70px;
  }

  h1 {
    font-size: clamp(50px, 15vw, 68px);
    letter-spacing: -0.07em;
  }

  h2 {
    font-size: 42px;
  }

  p,
  li {
    font-size: 16px;
  }

  .hero-statement {
    font-size: 26px;
  }

  .hero-note {
    font-size: 16px;
  }

  .signal-panel {
    min-height: 470px;
    padding: 22px;
  }

  .signal-lead {
    margin-top: 42px;
    font-size: 27px;
  }

  .truth-grid {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 23px 0;
  }

  .truth-grid p:last-child {
    text-align: left;
  }

  .section {
    padding-top: 100px;
    padding-bottom: 100px;
  }

  .method-lines article {
    grid-template-columns: 42px 1fr;
    min-height: 0;
  }

  .answer-row {
    grid-template-columns: 34px 1fr 24px;
    gap: 10px;
    padding: 28px 0;
  }

  .answer-row:hover {
    padding-left: 0;
    background: transparent;
  }

  .answer-row h3 {
    font-size: 24px;
  }

  .section-heading-row {
    margin-bottom: 45px;
  }

  .video-row {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .video-link {
    grid-column: 1;
  }

  .video-date {
    display: flex;
    align-items: baseline;
    gap: 7px;
  }

  .video-date strong {
    font-size: 19px;
  }

  .about-facts {
    grid-template-columns: 1fr;
  }

  .contact-section h2 {
    font-size: 50px;
  }

  .contact-line,
  .site-footer {
    flex-direction: column;
  }

  .article-header {
    min-height: auto;
    padding: 70px 0 65px;
  }

  .article-header h1 {
    font-size: 48px;
  }

  .article-layout {
    padding-top: 75px;
    padding-bottom: 90px;
  }

  .article-body p,
  .article-body li {
    font-size: 17px;
  }

  .video-source {
    padding: 24px;
  }

  .article-next {
    grid-template-columns: 1fr auto;
  }

  .article-next > span:first-child {
    grid-column: 1 / -1;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}