:root {
  --bg: #ffffff;
  --surface: #f7f8f9;
  --text: #202428;
  --text-soft: #454c52;
  --muted: #747c83;
  --line: #e2e5e7;
  --line-strong: #cbd0d4;
  --accent: #3d6f73;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "Inter", "Noto Sans KR", -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.container {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
}

.topnav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-social a {
  width: 23px;
  height: 23px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  text-decoration: none;
}

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

.nav-social svg {
  width: 21px;
  height: 21px;
  fill: currentColor;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  color: var(--text-soft);
  font-size: 14px;
  text-decoration: none;
}

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

.hero {
  padding: 64px 0 58px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 58px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
  align-items: center;
  gap: 52px;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(38px, 6vw, 50px);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

h1 .hangul {
  display: inline-block;
  margin-left: 12px;
  color: var(--muted);
  font-family: "Noto Sans KR", sans-serif;
  font-size: 0.46em;
  font-weight: 400;
  letter-spacing: -0.02em;
  vertical-align: 0.12em;
}

.subtitle {
  margin: 15px 0 24px;
  color: var(--muted);
  font-size: 16px;
}

.intro {
  max-width: 650px;
  margin-bottom: 14px;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.72;
}

.intro-secondary {
  margin-top: 0;
}

.intro em {
  color: var(--text);
  font-style: normal;
  font-weight: 600;
}

.intro a {
  color: var(--text);
  text-decoration-color: var(--line-strong);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  color: var(--text-soft);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  color: var(--text);
  background: var(--surface);
}

.button.primary {
  color: #ffffff;
  background: var(--text);
  border-color: var(--text);
}

.button.primary:hover {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

.profile-card {
  margin: 0;
}

.profile-card img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 16px 36px rgba(32, 36, 40, 0.12);
}

main {
  padding-bottom: 36px;
}

section {
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 58px;
}

section:last-child {
  border-bottom: 0;
}

h2 {
  margin-bottom: 24px;
  font-size: 28px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

h3 {
  margin-bottom: 5px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.012em;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 7px 12px;
  color: var(--text-soft);
  background: var(--surface);
  border-radius: 4px;
  font-size: 15px;
}

.publication-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.publication {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.venue {
  padding-top: 2px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.5;
  text-transform: uppercase;
}

.publication-title {
  color: var(--text);
  text-decoration-color: var(--line-strong);
}

.publication-title:hover {
  color: var(--accent);
}

.authors {
  margin: 7px 0 2px;
  color: var(--text-soft);
  font-size: 15px;
}

.authors strong {
  color: var(--text);
}

.meta {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

footer {
  border-top: 1px solid var(--line);
}

.not-found {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 30px;
  background: var(--surface);
}

.not-found > div {
  width: min(620px, 100%);
  text-align: center;
}

.not-found .eyebrow {
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.not-found h1 {
  margin-bottom: 14px;
}

.not-found > div > p:not(.eyebrow) {
  color: var(--muted);
}

.not-found .button {
  margin-top: 12px;
}

.footer-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}

.footer-inner p {
  margin-bottom: 0;
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 50px 0 46px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .profile-card {
    width: min(420px, 100%);
    margin: 0 auto;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 30px, 1040px);
  }

  h1 .hangul {
    display: block;
    margin: 10px 0 0;
    font-size: 0.5em;
  }

  section {
    padding: 40px 0;
  }

  .publication {
    grid-template-columns: 1fr;
    gap: 7px;
  }

}

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