:root {
  --paper: #ffffff;
  --ink: #191f28;
  --body: #4e5968;
  --muted: #8b95a1;
  --rule: #e5e8eb;
  --soft: #f4f5f7;
  --acc: #2b6ef2;

  --side: 240px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--acc); }

h1, h2, h3, p, ul, dl, dd { margin: 0; }
ul { padding: 0; list-style: none; }

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 1rem; top: 1rem; z-index: 20;
  background: var(--ink); color: var(--paper);
  padding: .5rem 1rem;
}

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

.label {
  font-size: 16px; font-weight: 700;
  color: var(--muted);
  letter-spacing: .06em;
}
.when { font-size: 12px; color: var(--muted); }

/* --- 레이아웃 --- */

.layout {
  display: grid;
  grid-template-columns: var(--side) minmax(0, 1fr);
  min-height: 100vh;
}

/* --- 회색 사이드 열 --- */

.side {
  position: sticky; top: 0;
  height: 100vh;
  padding: 50px 30px;
  background: var(--soft);
  display: flex; flex-direction: column;
  gap: 32px;
  overflow-y: auto;
}

.side-id { display: flex; flex-direction: column; gap: 4px; }
.mark {
  font-size: 28px; font-weight: 800;
  letter-spacing: -.03em; line-height: 1.2;
}
.mark:hover { color: var(--ink); }
.role { font-size: 13px; font-weight: 500; color: var(--acc); }

.side-lede { font-size: 13px; color: var(--body); }

.side-group { display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.side-group a { color: var(--ink); }
.side-group a:hover { color: var(--acc); }

.side-nav { display: flex; flex-direction: column; gap: 8px; }
.side-nav a {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 2px solid transparent;
  font-size: 14px; font-weight: 500;
  color: var(--muted);
  transition: color .15s, border-color .15s;
}
.side-nav a:hover { color: var(--ink); border-left-color: var(--ink); }

.side-contact { margin-top: auto; gap: 8px; }
.contact {
  display: flex; align-items: center; gap: 8px;
  min-height: 28px;
  color: var(--ink);
}
.contact:hover { color: var(--acc); }
.ico { display: block; flex: none; }

/* --- 본문 --- */

main { min-width: 0; padding-bottom: 80px; }

.hero {
  padding: 72px 72px 0;
}
.hero h1 {
  font-size: clamp(26px, 2.8vw, 34px);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.3;
}
.hl { color: var(--acc); }
.tagline {
  margin-top: 14px;
  font-size: 15px;
  color: var(--body);
  line-height: 1.6;
}
.intro {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.intro-col { display: flex; flex-direction: column; gap: 10px; }
.intro-col:first-child { padding-right: 36px; }
.intro-col + .intro-col { padding-left: 36px; border-left: 1px solid var(--rule); }
.intro-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 700;
}
.intro-title .ico { color: var(--acc); }
.intro-col p { color: var(--body); line-height: 1.7; }

.sec {
  padding: 64px 72px 0;
  display: flex; flex-direction: column; gap: 8px;
}
.sec-first { padding-top: 80px; }
.sec[id] { scroll-margin-top: 24px; }
.sec + .sec { padding-top: 52px; }

.projects { display: flex; flex-direction: column; }
.proj {
  padding: 28px 0 36px;
  border-top: 1px solid var(--rule);
  display: flex; flex-direction: column; gap: 14px;
}
.proj-head {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px; align-items: start;
  padding-left: 14px;
  border-left: 3px solid var(--acc);
}
.proj-title { display: flex; flex-direction: column; gap: 3px; }
.proj h3 { font-size: 16px; font-weight: 700; }
.proj-title p { color: var(--body); line-height: 1.6; }
.proj-head .when { white-space: nowrap; padding-top: 3px; }
.proj-detail { padding-left: 17px; display: flex; flex-direction: column; gap: 8px; }
.feats { padding: 0 0 0 18px; list-style: disc; color: var(--body); display: flex; flex-direction: column; gap: 2px; line-height: 1.7; }
.gains li { color: var(--ink); }
.gains .todo { color: var(--muted); font-style: italic; }
.stack { font-size: 12px; color: var(--muted); }
.proj-foot { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.proj-link { font-size: 13px; white-space: nowrap; }
.proj-link a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--rule); }
.proj-link a:hover { text-decoration-color: var(--acc); }

.exps { display: flex; flex-direction: column; }
.exp {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 24px;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
}
.exp .when { padding-top: 2px; }
.exp-body { display: flex; flex-direction: column; gap: 2px; }
.exp-role { color: var(--ink); }
.exp-body p { color: var(--body); }

.skill-rows { display: flex; flex-direction: column; }
.skill-row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 24px;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
}
.skill-row dt { font-weight: 700; }
.skill-row dd { color: var(--body); }


/* --- 모바일 --- */

@media (max-width: 48rem) {
  .layout { grid-template-columns: 1fr; }

  .side {
    position: static;
    height: auto;
    padding: 32px 20px;
    gap: 20px;
    overflow: visible;
  }
  .mark { font-size: 24px; }

  .hero, .sec { padding-left: 20px; padding-right: 20px; }
  .hero { padding-top: 40px; }
  .sec-first { padding-top: 48px; }
  .sec { padding-top: 40px; }


  .skill-row, .exp { grid-template-columns: 1fr; gap: 2px; }
  .proj-head { grid-template-columns: 1fr; gap: 4px; }
  .proj-head .when { padding-top: 0; }

  .intro { grid-template-columns: 1fr; gap: 20px; }
  .intro-col:first-child { padding-right: 0; }
  .intro-col + .intro-col { padding-left: 0; padding-top: 20px; border-left: 0; border-top: 1px solid var(--rule); }

}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}