:root {
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e5e5e5;
  --accent: #2563eb;
  --bg: #ffffff;
  --card: #fafafa;
}

* { box-sizing: border-box; }

html, body {
  /* clip (not hidden) so position: sticky on the header keeps working */
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-wrap: break-word;
  -webkit-text-size-adjust: 100%;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & nav */
header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  padding: 0.9rem 0;
}

nav .logo { font-weight: 700; }

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

/* Hero */
.hero { padding: 4.5rem 0 3rem; }

.hero h1 {
  font-size: clamp(2rem, 9vw, 2.4rem);
  margin: 0 0 0.25rem;
  letter-spacing: -0.02em;
}

.hero .korean {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1rem;
}

.hero .tagline {
  font-size: 1.15rem;
  max-width: 34em;
  margin: 0;
}

/* Sections */
section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  scroll-margin-top: 5rem;
}

section h2 {
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

/* Skills */
.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.skills li {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
  font-size: 0.9rem;
}

/* Projects */
.project {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
  margin-bottom: 1rem;
}

.project h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }

.project p {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.project a,
.contact-links a {
  color: var(--accent);
  text-decoration: none;
}

.project a { font-size: 0.9rem; }

.project a:hover,
.contact-links a:hover { text-decoration: underline; }

/* Experience */
.job { margin-bottom: 1.5rem; }

.job h3 { margin: 0; font-size: 1.05rem; }

.job .meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.1rem 0 0.4rem;
}

.job p { margin: 0; font-size: 0.95rem; }

/* Contact */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Mobile: name on its own row, menu links on the row below */
@media (max-width: 640px) {
  .container { padding: 0 1rem; }

  nav {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 0;
  }

  nav ul { gap: 0.25rem 1rem; }

  nav a,
  .contact-links a {
    display: inline-block;
    padding: 0.2rem 0;
  }

  .hero { padding: 2.75rem 0 2rem; }
  .hero .tagline { font-size: 1.05rem; }

  section { padding: 2rem 0; }

  .project { padding: 1rem; }

  .contact-links { gap: 0.25rem 1.25rem; }
}