:root {
  --paper: #f5f5f5;
  --ink: #171717;
  --muted: #6b6b6b;
  --line: rgba(23, 23, 23, 0.2);
  --accent-light: #dedede;
  --accent-dark: #454545;
  --on-dark: #f5f5f5;
  --dark-muted: #ababab;
  --dark-line: rgba(245, 245, 245, 0.28);
  --serif: "Instrument Serif", Georgia, serif;
  --ko-serif: "Noto Serif KR", "Instrument Serif", Georgia, serif;
  --sans: "Noto Sans KR", "Manrope", Arial, sans-serif;
  --mono: "DM Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

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

button,
input {
  font: inherit;
}

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

.site-header {
  position: relative;
  min-height: 126px;
  padding: 24px clamp(22px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: block;
}

.wordmark img {
  display: block;
  width: auto;
  height: 70px;
  mix-blend-mode: darken;
}

.lecture-page .wordmark img {
  filter: invert(1);
  mix-blend-mode: lighten;
}

.site-nav {
  position: absolute;
  /* left: 50%;
  transform: translateX(-50%); */
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  gap: 42px;
  /* font-family: var(--mono); */
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.site-nav a {
  position: relative;
  padding: 7px 10px;
  border-radius: 999px;
  transition: color 180ms ease, background 180ms ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 200ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav a[aria-current="page"] {
  background: var(--accent-dark);
  color: var(--on-dark);
}

.site-nav a[aria-current="page"]::after {
  display: none;
}

.menu-button {
  display: none;
}

.hero {
  min-height: calc(100vh - 126px);
  padding: clamp(34px, 5vw, 72px) clamp(22px, 4vw, 64px) 32px;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.hero-kicker,
.section-heading > p,
.newsletter-copy > p {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.hero-kicker::before {
  content: "✳";
  color: var(--accent-dark);
  margin-right: 9px;
}

.hero h1 {
  align-self: center;
  margin: 20px 0 56px;
  font-family: var(--ko-serif);
  font-size: clamp(67px, 11.4vw, 150px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.hero h1 em {
  display: inline-block;
  margin-left: 8vw;
  font-weight: 400;
}

.hero-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.hero-bottom p {
  max-width: 420px;
  margin: 0 0 5px;
  font-size: clamp(15px, 1.4vw, 19px);
  letter-spacing: -0.02em;
}

.round-link {
  width: 66px;
  height: 66px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  transition: background 180ms ease, transform 180ms ease;
}

.round-link:hover,
.round-link:focus-visible {
  background: var(--accent-light);
  transform: rotate(-8deg);
}

.round-link svg {
  width: 27px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
}

.essays-section {
  padding: 110px clamp(22px, 4vw, 64px) 130px;
  background: var(--ink);
  color: var(--paper);
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  align-items: end;
  margin-bottom: 72px;
}

.section-heading p,
.section-heading h2 {
  margin: 0;
}

.section-heading h2 {
  font-family: var(--ko-serif);
  font-size: clamp(43px, 5.3vw, 78px);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.035em;
}

.section-heading span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dark-muted);
}

.essay-card {
  border-top: 1px solid var(--dark-line);
}

.essay-card:last-child {
  border-bottom: 1px solid var(--dark-line);
}

.essay-card a {
  min-height: 270px;
  padding: 32px 0 28px;
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  align-items: start;
  transition: color 180ms ease;
}

.essay-number,
.essay-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dark-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.essay-copy h3 {
  max-width: 690px;
  margin: 20px 0 18px;
  font-family: var(--ko-serif);
  font-size: clamp(43px, 5.5vw, 82px);
  font-weight: 400;
  line-height: 0.94;
  letter-spacing: -0.035em;
  transition: transform 220ms ease;
}

.essay-excerpt {
  max-width: 520px;
  margin: 0;
  color: var(--dark-muted);
  font-size: 14px;
}

.essay-mark {
  font-family: var(--serif);
  font-size: 42px;
  line-height: 1;
  transition: transform 220ms ease;
}

.essay-card a:hover {
  color: var(--on-dark);
}

.essay-card a:hover .essay-copy h3 {
  transform: translateX(10px);
}

.essay-card a:hover .essay-mark {
  transform: rotate(45deg);
}

.about-section {
  padding: 130px clamp(22px, 4vw, 64px) 150px;
  display: grid;
  grid-template-columns: 1fr minmax(220px, 32vw) 1fr;
  gap: clamp(30px, 4vw, 64px);
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.about-profile {
  grid-column: 2;
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  justify-self: center;
  /* filter: grayscale(1); */
}

.about-copy {
  grid-column: 3;
}

.about-copy h2 {
  max-width: 900px;
  margin: 0;
  font-family: var(--ko-serif);
  font-size: clamp(1px, 5.4vw, 30px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.about-aside {
  margin: 70px 0 0;
  font-family: var(--ko-serif);
  font-size: 14px;
  line-height: 1.7;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.about-aside h3 {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.about-aside ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Adds space before headings that follow a list */
.about-aside ul + h3 {
  margin-top: 24px;
}


.about-aside li + li {
  margin-top: 2px;
}

.newsletter {
  min-height: 560px;
  padding: 100px clamp(22px, 4vw, 64px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  background: var(--accent-dark);
  color: var(--on-dark);
}

.newsletter-copy h2 {
  margin: 24px 0 0;
  font-family: var(--ko-serif);
  font-size: clamp(53px, 6.4vw, 96px);
  font-weight: 400;
  line-height: 0.87;
  letter-spacing: -0.04em;
}

.newsletter-copy h2 em {
  font-weight: 400;
}

.subscribe-form {
  position: relative;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(245, 245, 245, 0.75);
}

.subscribe-form input {
  min-width: 0;
  flex: 1;
  padding: 18px 8px 18px 0;
  color: inherit;
  background: transparent;
  border: 0;
  outline: 0;
}

.subscribe-form input::placeholder {
  color: rgba(245, 245, 245, 0.68);
}

.subscribe-form button {
  padding: 12px 0 12px 18px;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.subscribe-form button span {
  display: inline-block;
  margin-left: 8px;
  transition: transform 180ms ease;
}

.subscribe-form button:hover span {
  transform: translateX(5px);
}

.form-message {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
}

.site-footer {
  padding: 54px clamp(22px, 4vw, 64px);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: end;
  background: var(--ink);
  color: var(--paper);
}

.footer-mark {
  font-family: var(--serif);
  font-size: 55px;
}

.footer-mark span {
  color: var(--on-dark);
  font-style: italic;
}

.site-footer p,
.footer-links {
  margin: 0;
  color: var(--dark-muted);
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
}

.footer-links {
  text-align: right;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 760px) {
  .site-header {
    min-height: 95px;
    align-items: flex-start;
  }

  .wordmark img {
    height: 46px;
  }

  .menu-button {
    position: relative;
    z-index: 3;
    width: 35px;
    height: 28px;
    padding: 5px 0;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    background: transparent;
    border: 0;
  }

  .menu-button span:not(.sr-only) {
    width: 100%;
    height: 1px;
    background: currentColor;
    transition: transform 180ms ease;
  }

  .menu-button[aria-expanded="true"] span:nth-child(2) {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-button[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
  }

  .menu-button[aria-expanded="true"] {
    color: var(--ink);
  }

  .site-nav {
    position: fixed;
    z-index: 2;
    inset: 0;
    padding: 130px 24px;
    display: flex;
    flex-direction: column;
    gap: 25px;
    background: var(--accent-light);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 52px;
    text-transform: none;
    transform: translateY(-100%);
    transition: transform 280ms ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
  }

  .hero {
    min-height: calc(100svh - 95px);
  }

  .hero h1 {
    font-size: clamp(40px, 21vw, 50px);
    line-height: 1.2;
  }

  .hero h1 em {
    margin-left: 0;
  }

  .hero-bottom p {
    max-width: 250px;
  }

  .round-link {
    width: 54px;
    height: 54px;
  }

  .essays-section {
    padding-top: 80px;
    padding-bottom: 90px;
  }

  .section-heading,
  .essay-card a,
  .about-section,
  .newsletter {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 24px;
    margin-bottom: 55px;
  }

  .section-heading span {
    display: none;
  }

  .essay-card a {
    min-height: 310px;
  }

  .essay-copy h3 {
    margin-top: 46px;
    font-size: 51px;
  }

  .essay-mark {
    position: absolute;
    right: 24px;
  }

  .about-section {
    padding-top: 90px;
    padding-bottom: 100px;
    gap: 38px;
  }

  .about-profile {
    grid-column: 1;
    width: min(100%, 360px);
  }

  .about-copy {
    grid-column: 1;
  }

  .about-copy h2 {
    font-size: 44px;
  }

  .about-aside {
    margin: 55px 0 0;
  }

  .newsletter {
    min-height: 620px;
    align-content: center;
    gap: 75px;
  }

  .site-footer {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer p {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}

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

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}