:root {
  --bg: #f6f2ff;
  --surface: #ffffff;
  --surface-soft: #fbf9ff;
  --text: #1d1a27;
  --muted: #716a82;
  --line: #e4dcf5;
  --accent: #6d5bd0;
  --accent-strong: #3f358f;
  --accent-soft: #ebe7ff;
  --shadow: 0 24px 70px rgba(48, 36, 92, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(128, 105, 220, 0.18), transparent 34rem),
    radial-gradient(circle at 85% 12%, rgba(207, 190, 255, 0.28), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: "Pretendard Variable", "Pretendard", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.72;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 22px 0;
  backdrop-filter: blur(20px);
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 6px;
  border: 1px solid rgba(228, 220, 245, 0.78);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 32px rgba(48, 36, 92, 0.06);
}

.nav a {
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 13px;
  transition:
    background 180ms ease,
    color 180ms ease;
}

.nav a:hover {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.section {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 80px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 56px;
  align-items: center;
  min-height: calc(100vh - 86px);
  padding-top: 54px;
}

.eyebrow,
.section-label {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(3.2rem, 8vw, 6.4rem);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.02;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.3rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.12rem;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.hero-lead {
  max-width: 680px;
  margin-bottom: 22px;
  color: #342f42;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.36;
}

.hero-text,
.section-body,
.contact p {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.82;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--accent-strong);
  font-weight: 600;
  padding: 0 18px;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(48, 36, 92, 0.1);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

.profile-card {
  display: grid;
  gap: 18px;
  border: 1px solid rgba(228, 220, 245, 0.9);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  padding: 18px;
}

.profile-photo {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 420px;
  border-radius: 22px;
  object-fit: cover;
  object-position: center;
}

.profile-card span {
  display: block;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 56px;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  gap: 14px;
  max-width: 720px;
  margin-bottom: 34px;
}

.interest-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.interest-card,
.paper-card,
.cv-block,
.contact {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 16px 44px rgba(48, 36, 92, 0.05);
}

.interest-card {
  min-height: 190px;
  padding: 22px;
}

.interest-card p,
.paper-card p,
.timeline-item p,
.clean-list p {
  color: var(--muted);
  line-height: 1.75;
}

.paper-list {
  display: grid;
  gap: 16px;
}

.paper-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: start;
  padding: 24px;
}

.muted {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.65;
}

.inline-links,
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.inline-links a,
.contact-links a {
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 12px;
}

.timeline-section {
  border-top: 1px solid var(--line);
}

.cv-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.cv-block {
  padding: 24px;
}

.cv-block.wide {
  grid-column: 1 / -1;
}

.timeline-item + .timeline-item {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.date,
.clean-list span {
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

.clean-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 36px;
  align-items: center;
  margin-bottom: 80px;
  padding: 34px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 28px 0 42px;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .nav {
    max-width: 100%;
    overflow-x: auto;
  }

  .hero,
  .split,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .profile-card {
    max-width: 520px;
  }

  .interest-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact {
    align-items: start;
  }
}

@media (max-width: 640px) {
  .site-header,
  .section,
  .footer {
    width: min(100% - 28px, var(--max-width));
  }

  .section {
    padding: 58px 0;
  }

  .hero-actions,
  .footer {
    flex-direction: column;
  }

  .button,
  .hero-actions a {
    width: 100%;
  }

  .profile-photo {
    min-height: 320px;
  }

  .interest-grid,
  .paper-card,
  .cv-grid {
    grid-template-columns: 1fr;
  }

  .paper-card {
    gap: 18px;
  }
}
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: #1f2937;
  background: #f8fafc;
  line-height: 1.6;
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(248, 250, 252, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e2e8f0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

.nav a {
  padding: 6px 8px;
  border-radius: 999px;
}

.nav a:hover {
  background: #e2e8f0;
}

.hero {
  padding: 84px 0 72px;
  background: linear-gradient(120deg, #eff6ff, #ffffff);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.8rem;
  color: #475569;
}

.hero h1 {
  font-size: clamp(2rem, 3vw + 1.2rem, 3.4rem);
  margin: 12px 0 18px;
}

.lead {
  max-width: 680px;
  font-size: 1.05rem;
  color: #475569;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.section {
  padding: 72px 0;
}

.section.alt {
  background: #f1f5f9;
}

.grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid.three {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: #ffffff;
  padding: 24px;
  border-radius: 16px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.04);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
}

.button.primary {
  background: #6d5bd0;
  color: #ffffff;
}

.button.primary:hover {
  background: #5b4bb8;
}

.button.ghost {
  border-color: #cbd5f5;
  color: #1e293b;
}

.button.ghost:hover {
  background: #e2e8f0;
}

.text-link {
  font-weight: 600;
  color: #2563eb;
}

.contact {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.social {
  display: flex;
  gap: 14px;
  font-size: 0.95rem;
  color: #475569;
}

.site-footer {
  border-top: 1px solid #e2e8f0;
  padding: 28px 0;
  text-align: center;
  color: #64748b;
  background: #ffffff;
}

@media (max-width: 720px) {
  .nav {
    display: none;
  }

  .hero {
    padding: 64px 0 56px;
  }
}

#contact.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 36px;
  align-items: center;
  margin-top: 0;
  margin-bottom: 80px;
  padding: 34px;
}

#contact .contact-links {
  justify-content: flex-end;
}

@media (max-width: 900px) {
  #contact.contact {
    grid-template-columns: 1fr;
    align-items: start;
  }

  #contact .contact-links {
    justify-content: flex-start;
  }
}