:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --text: #1a1a1a;
  --text-muted: #5a5f66;
  --accent: #2952e3;
  --accent-tint: rgba(41, 82, 227, 0.08);
  --accent-border: rgba(41, 82, 227, 0.25);
  --border: #e5e7eb;
  --max-width: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --bg-alt: #1b1e24;
    --text: #eef0f2;
    --text-muted: #a3a9b3;
    --accent: #7c9bff;
    --accent-tint: rgba(124, 155, 255, 0.14);
    --accent-border: rgba(124, 155, 255, 0.35);
    --border: #2a2d33;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", "Noto Sans KR", Roboto, sans-serif;
  line-height: 1.6;
}

.hero {
  position: relative;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 3rem 1.5rem 2.5rem;
  --accent: #3d8bd0;
  --accent-tint: rgba(61, 139, 208, 0.12);
  --accent-border: rgba(61, 139, 208, 0.35);
  --on-accent: #ffffff;
  font-family: Manrope, "Noto Sans KR", sans-serif;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.hero-text {
  flex: 1;
  min-width: 0;
}

.hero-text h1 {
  margin: 0 0 0.3rem;
  font-family: "Space Grotesk", "Noto Sans KR", Manrope, sans-serif;
  font-size: 1.9rem;
  letter-spacing: -0.02em;
}

.hangul-name {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1.15rem;
}

.role {
  margin: 0 0 0.6rem;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.92rem;
}

.intro {
  margin: 0 0 0.9rem;
  color: var(--text);
  font-size: 0.94rem;
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1rem;
}

.interest-tag {
  padding: 0.15rem 0.65rem;
  background: var(--accent-tint);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-links a {
  display: inline-flex;
  padding: 0.35rem 0.75rem;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.contact-links a:hover {
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
}

#lang-toggle {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  cursor: pointer;
}

#lang-toggle:hover { border-color: #2952e3; color: #2952e3; }

@media (prefers-color-scheme: dark) {
  #lang-toggle:hover { border-color: #7c9bff; color: #7c9bff; }
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.block {
  margin: 0;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.block:first-child {
  padding-top: 0;
  border-top: 0;
}

.block h2 {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  color: var(--accent);
  margin: 0 0 0.55rem;
}

.section-intro {
  max-width: 62ch;
  margin: 0 0 1.1rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.entry {
  margin: 0;
  padding: 1.15rem 0;
}

.entry:last-child { padding-bottom: 0; }

.rail .entry {
  border-left: 3px solid rgba(61, 139, 208, 0.3);
  padding: 1.15rem 0 1.15rem 1rem;
  margin-bottom: 0.6rem;
}

.rail .entry:last-child { margin-bottom: 0; }

.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry-head h3 { margin: 0; font-size: 1rem; }

.date {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.date.status,
.entry-sub.award {
  display: inline-flex;
  width: fit-content;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.entry-sub.award { margin-top: 0.45rem; }

.badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.45rem;
}

.badge-row .entry-sub.award { margin-top: 0; }

.repo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  width: fit-content;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.08rem 0.4rem;
  font-size: 0.62rem;
  font-weight: 400;
  text-decoration: none;
}

.repo-badge:hover { border-color: var(--accent); }

.entry-sub {
  margin: 0.1rem 0 0.4rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.project-links {
  margin: 0.6rem 0 0;
  font-size: 0.85rem;
  font-weight: 700;
}

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

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

ul { margin: 0.4rem 0 0; padding-left: 1.2rem; }
li { margin-bottom: 0.25rem; }

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-groups {
  display: grid;
  gap: 1rem;
}

.skill-group h3 {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.skill-tags span {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.7rem;
  font-size: 0.85rem;
}

footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
  }
  .intro { margin-inline: auto; }
  .interest-tags, .contact-links { justify-content: center; }
  .hero-text h1 { font-size: 1.6rem; }
  #lang-toggle {
    position: static;
    display: block;
    margin: 1rem auto 0;
  }
}