:root {
  --bg: #f6f4ef;
  --surface: #fdfcf9;
  --sunk: #efece4;
  --ink: #1d2320;
  --muted: #646a65;
  --line: #dedacf;
  --accent: #2f5d50;
  --accent-ink: #ffffff;
  --accent-soft: rgba(47, 93, 80, 0.10);
  --hero: #17241f;
  --hero-ink: #eef1ec;
  --hero-muted: #a9b5ae;
  --hero-accent: #9fd0bd;
  --shadow: 0 1px 2px rgba(29, 35, 32, .04), 0 8px 24px rgba(29, 35, 32, .06);
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --wide: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121513; --surface: #1a1e1b; --sunk: #161a17;
    --ink: #e4e7e2; --muted: #959b94; --line: #2b302c;
    --accent: #8fc4b0; --accent-ink: #10201a; --accent-soft: rgba(143, 196, 176, .12);
    --hero: #0d1512;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"] {
  --bg: #121513; --surface: #1a1e1b; --sunk: #161a17;
  --ink: #e4e7e2; --muted: #959b94; --line: #2b302c;
  --accent: #8fc4b0; --accent-ink: #10201a; --accent-soft: rgba(143, 196, 176, .12);
  --hero: #0d1512;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  word-break: keep-all;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s, color .25s;
}
a { color: inherit; text-decoration-color: var(--line); text-underline-offset: 4px; }
a:hover { color: var(--accent); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { margin: 0; }
ul, ol { list-style: none; margin: 0; padding: 0; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--surface); padding: .4rem .8rem; z-index: 20; }

/* 상단 바: 첫 화면 위에서는 투명, 스크롤하면 배경이 생김 */
.topbar {
  position: fixed; inset: 0 0 auto; z-index: 10;
  color: var(--hero-ink);
  transition: background-color .25s, color .25s, box-shadow .25s;
}
.topbar.solid {
  color: var(--ink);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--line);
}
.topbar-in { display: flex; align-items: center; gap: 1.5rem; max-width: var(--wide); margin: 0 auto; padding: .9rem 1.5rem; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; text-decoration: none; }
.brand:hover { color: inherit; }
.mark { width: 10px; height: 10px; border-radius: 3px; background: var(--hero-accent); }
.topbar.solid .mark { background: var(--accent); }
.topbar nav { display: flex; gap: 1.4rem; margin-left: auto; font-size: .9rem; }
.topbar nav a { text-decoration: none; opacity: .72; }
.topbar nav a:hover, .topbar nav a.active { opacity: 1; color: inherit; }
.topbar nav a.active { box-shadow: 0 2px 0 currentColor; }
.theme-toggle {
  display: grid; place-items: center; width: 34px; height: 34px; padding: 0;
  border: 1px solid color-mix(in srgb, currentColor 30%, transparent); border-radius: 50%;
  background: transparent; color: inherit; cursor: pointer;
}
.theme-toggle:hover { border-color: currentColor; }
.i-sun { display: none; }
:root[data-theme="dark"] .i-sun { display: block; }
:root[data-theme="dark"] .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: block; }
  :root:not([data-theme="light"]) .i-moon { display: none; }
}

/* 첫 화면 */
.hero {
  position: relative; overflow: hidden;
  min-height: min(100svh, 52rem);
  display: flex; flex-direction: column; justify-content: center;
  padding: 7rem 1.5rem 0;
  background:
    radial-gradient(60rem 30rem at 85% 10%, rgba(159, 208, 189, .14), transparent 60%),
    radial-gradient(circle at 1px 1px, rgba(238, 241, 236, .07) 1px, transparent 0) 0 0 / 22px 22px,
    var(--hero);
  color: var(--hero-ink);
}
.hero-net { position: absolute; right: -6%; top: 8%; width: min(62vw, 46rem); height: auto; opacity: .55; pointer-events: none; }
.hero-net .links path { stroke: var(--hero-accent); stroke-opacity: .28; stroke-width: 1.2; fill: none; stroke-dasharray: 4 6; animation: flow 18s linear infinite; }
.hero-net .nodes circle { fill: var(--hero); stroke: var(--hero-accent); stroke-width: 1.5; }
.hero-net .core { fill: var(--hero-accent); }
.hero-net .pulse { fill: none; stroke: var(--hero-accent); stroke-width: 1.5; transform-origin: 300px 200px; animation: pulse 3.2s ease-out infinite; }
@keyframes flow { to { stroke-dashoffset: -200; } }
@keyframes pulse { from { transform: scale(1); opacity: .8; } to { transform: scale(5); opacity: 0; } }

.hero-in { position: relative; max-width: var(--wide); width: 100%; margin: 0 auto; }
.eyebrow { margin: 0 0 1.2rem; font-family: var(--mono); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--hero-accent); }
.hero h1 { font-size: clamp(2.4rem, 6.4vw, 4.4rem); font-weight: 700; line-height: 1.18; letter-spacing: -0.03em; }
.hero .name { color: var(--hero-accent); }
.lede { margin: 1.5rem 0 0; max-width: 36rem; font-size: 1.1rem; color: var(--hero-muted); }
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.2rem; }
.btn {
  display: inline-flex; align-items: center; min-height: 46px; padding: 0 1.3rem;
  border-radius: 999px; font-size: .95rem; font-weight: 600; text-decoration: none;
  transition: transform .15s, background-color .2s, border-color .2s;
}
.btn:hover { transform: translateY(-1px); }
.hero .btn.primary { background: var(--hero-accent); color: #10201a; }
.hero .btn.ghost { border: 1px solid rgba(238, 241, 236, .3); color: var(--hero-ink); }
.hero .btn.ghost:hover { border-color: var(--hero-ink); }

.stats {
  position: relative; display: grid; grid-template-columns: repeat(4, 1fr);
  max-width: var(--wide); width: 100%; margin: 4.5rem auto 0;
  border-top: 1px solid rgba(238, 241, 236, .12);
}
.stats div { padding: 1.4rem 0 1.8rem; }
.stats div + div { padding-left: 1.5rem; border-left: 1px solid rgba(238, 241, 236, .12); }
.stats dt { font-size: .82rem; color: var(--hero-muted); }
.stats dd { margin: .2rem 0 0; font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 700; letter-spacing: -0.02em; }

/* 섹션 공통 */
.block { max-width: var(--wide); margin: 0 auto; padding: 6rem 1.5rem 0; }
.head { display: flex; align-items: baseline; gap: .9rem; margin-bottom: 2.4rem; }
.head h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); font-weight: 700; letter-spacing: -0.02em; }
.num { font-family: var(--mono); font-size: .85rem; color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.chips li {
  padding: .1rem .65rem; border-radius: 999px; font-size: .8rem;
  background: var(--sunk); color: var(--muted); border: 1px solid var(--line);
}
.chips.strong li { background: var(--accent); color: var(--accent-ink); border-color: transparent; font-weight: 600; }

/* 소개 */
.about { display: grid; grid-template-columns: 1.2fr 1fr; gap: 3rem; align-items: start; }
.about-text { margin: 0; font-size: 1.12rem; line-height: 1.85; }
.facts { display: grid; gap: .2rem; padding: 1.2rem 1.4rem; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.facts li { display: grid; grid-template-columns: 22px 4rem 1fr; gap: .7rem; align-items: center; padding: .55rem 0; }
.facts li + li { border-top: 1px solid var(--line); }
.facts svg { width: 20px; height: 20px; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.facts .k { font-size: .85rem; color: var(--muted); }
.facts .v { font-size: .95rem; }

/* 기술 */
.skills { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.skill { padding: 1.4rem; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.skill h3 { margin-bottom: .9rem; font-family: var(--mono); font-size: .78rem; font-weight: 500; letter-spacing: .04em; color: var(--muted); }
.skill p { margin: .9rem 0 0; font-size: .9rem; color: var(--muted); line-height: 1.6; }

/* 경력 타임라인 */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before { content: ""; position: absolute; left: 6px; top: .6rem; bottom: .6rem; width: 2px; background: var(--line); }
.timeline li { position: relative; padding-bottom: 2.2rem; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: calc(-2rem + 1px); top: .45rem;
  width: 12px; height: 12px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.timeline li:first-child::before { background: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }
.when { margin: 0; font-family: var(--mono); font-size: .82rem; color: var(--muted); }
.timeline h3 { margin-top: .2rem; font-size: 1.2rem; font-weight: 700; display: flex; align-items: center; gap: .6rem; }
.now { font-size: .72rem; font-weight: 600; padding: .05rem .55rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.desc { margin: .3rem 0 0; color: var(--muted); }

/* 프로젝트 */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin: -1rem 0 1.6rem; }
.filters button {
  min-height: 38px; padding: 0 1rem; border-radius: 999px; cursor: pointer;
  font: inherit; font-size: .88rem; color: var(--muted);
  background: transparent; border: 1px solid var(--line);
}
.filters button:hover { color: var(--ink); border-color: var(--muted); }
.filters button.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card {
  display: flex; flex-direction: column; gap: .5rem;
  padding: 1.4rem; background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.card[hidden] { display: none; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.client { font-size: .85rem; font-weight: 600; color: var(--accent); }
.field { font-family: var(--mono); font-size: .72rem; color: var(--muted); }
.card h3 { font-size: 1.08rem; font-weight: 700; line-height: 1.45; }
.period { margin: 0; display: flex; gap: .5rem; flex-wrap: wrap; font-family: var(--mono); font-size: .8rem; color: var(--muted); }
.dur:not(:empty)::before { content: "· "; }
.card .chips { margin-top: auto; padding-top: .6rem; }
.note { margin: 1.2rem 0 0; font-size: .82rem; color: var(--muted); }

/* 연락처 */
.contact { margin-top: 7rem; padding: 0 1.5rem; }
.contact-in {
  max-width: var(--wide); margin: 0 auto; padding: 3.5rem 3rem;
  border-radius: 24px; background: var(--hero); color: var(--hero-ink);
  background-image: radial-gradient(circle at 1px 1px, rgba(238, 241, 236, .07) 1px, transparent 0);
  background-size: 22px 22px;
}
.contact .num { color: var(--hero-accent); }
.contact h2 { margin-top: .8rem; font-size: clamp(1.5rem, 3.6vw, 2.2rem); font-weight: 700; line-height: 1.35; letter-spacing: -0.02em; }
.contact .btn.primary { background: var(--hero-accent); color: #10201a; }
.contact .btn.ghost { border: 1px solid rgba(238, 241, 236, .3); color: var(--hero-ink); }

.foot { max-width: var(--wide); margin: 0 auto; padding: 2.5rem 1.5rem 3rem; font-size: .85rem; color: var(--muted); }
.foot p { margin: 0; }

/* 스크롤 시 나타나기 */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-net .links path, .hero-net .pulse { animation: none; }
}

/* 태블릿 */
@media (max-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .skills { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; gap: 2rem; }
}
/* 모바일 */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .topbar-in { padding: .75rem 1rem; gap: .8rem; }
  .topbar nav { gap: .8rem; font-size: .82rem; }
  .brand { font-size: .95rem; }
  .hero { padding: 6rem 1rem 0; min-height: auto; }
  .hero-net { width: 120vw; right: -40%; top: 4%; opacity: .3; }
  .stats { grid-template-columns: repeat(2, 1fr); margin-top: 3.5rem; }
  .stats div { padding: 1.1rem 0; }
  .stats div + div { padding-left: 0; border-left: 0; }
  .stats div:nth-child(even) { padding-left: 1rem; border-left: 1px solid rgba(238, 241, 236, .12); }
  .stats div:nth-child(n+3) { border-top: 1px solid rgba(238, 241, 236, .12); }
  .block { padding: 4.5rem 1rem 0; }
  .cards, .skills { grid-template-columns: 1fr; }
  .contact { padding: 0 1rem; margin-top: 5rem; }
  .contact-in { padding: 2.5rem 1.5rem; border-radius: 18px; }
  .foot { padding: 2rem 1rem 2.5rem; }
}
@media (max-width: 400px) {
  .topbar nav a:nth-child(2) { display: none; }
}

/* 다크 모드에서 어두운 띠가 배경과 섞이지 않도록 경계선 */
:root[data-theme="dark"] .contact-in, :root[data-theme="dark"] .hero { box-shadow: inset 0 0 0 1px rgba(238, 241, 236, .08); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .contact-in, :root:not([data-theme="light"]) .hero { box-shadow: inset 0 0 0 1px rgba(238, 241, 236, .08); }
}