:root {
  --bg: #0a0a0a;
  --bg-2: #111;
  --fg: #e8e8e8;
  --muted: #888;
  --line: #1f1f1f;
  --accent: #00ff9c;
  --accent-dim: #00b86f;
  --link: #7cd1ff;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

/* topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  background: rgba(10,10,10,.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; font-family: var(--mono); color: var(--fg); }
.brand:hover { text-decoration: none; }
.prompt { color: var(--accent); font-weight: 700; }
.brand-name { font-weight: 500; }

.lang-btn {
  font-family: var(--mono);
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
}
.lang-btn:hover { border-color: var(--accent-dim); color: var(--accent); }

/* hero */
.hero { padding: 56px 0 32px; }
.hero h1 {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  margin: 32px 0 12px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.hero .lead { color: var(--muted); font-size: 17px; max-width: 60ch; margin: 0 0 28px; }

.terminal {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--mono);
  font-size: 13.5px;
  overflow: hidden;
}
.terminal-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px;
  background: #161616;
  border-bottom: 1px solid var(--line);
}
.terminal-bar span:nth-child(-n+3) {
  width: 11px; height: 11px; border-radius: 50%;
  background: #2a2a2a;
}
.terminal-title {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}
.terminal-body { padding: 16px 18px; }
.terminal-body p { margin: 2px 0; }
.terminal-body .muted { color: var(--accent-dim); margin-right: 6px; }
.terminal-body .accent { color: var(--accent); }
.cursor {
  display: inline-block;
  width: 8px; height: 14px;
  background: var(--accent);
  vertical-align: middle;
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* cta */
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 14px;
  padding: 11px 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--fg);
  background: var(--bg-2);
  transition: all .15s ease;
}
.btn:hover { border-color: var(--accent-dim); color: var(--accent); text-decoration: none; }
.btn.primary {
  background: var(--accent);
  color: #00210e;
  border-color: var(--accent);
  font-weight: 700;
}
.btn.primary:hover { background: #6affc1; color: #00210e; }

/* sections */
.section { padding: 40px 0; border-top: 1px solid var(--line); }
.section h2 {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 24px;
  letter-spacing: -0.01em;
}
.hash { color: var(--accent); }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 720px) {
  .grid-2 { grid-template-columns: 1.4fr 1fr; }
}
.kv {
  list-style: none; padding: 0; margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-2);
}
.kv li {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.kv li:last-child { border-bottom: 0; }
.kv .k { color: var(--muted); }

/* cards */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 600px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 18px 16px;
  background: var(--bg-2);
}
.card h3 {
  font-family: var(--mono);
  font-size: 15px;
  margin: 0 0 6px;
  color: var(--accent);
}
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* portfolio */
.portfolio { display: grid; gap: 14px; }
.proj {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
  background: var(--bg-2);
}
.proj-head {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px;
  margin-bottom: 6px;
}
.proj h3 { margin: 0; font-size: 16px; font-weight: 700; }
.proj .tag {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
}
.proj p { margin: 4px 0 8px; color: var(--fg); font-size: 14.5px; }
.proj a { font-family: var(--mono); font-size: 13px; }

/* timeline */
.timeline {
  list-style: none; padding: 0; margin: 0;
  display: grid;
  gap: 16px;
}
.timeline li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}
@media (min-width: 720px) {
  .timeline li {
    grid-template-columns: 180px 1fr;
    gap: 16px;
    padding-left: 0;
    border-left: 0;
  }
}
.timeline .period {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
}
.timeline strong { font-size: 15px; }
.timeline p { margin: 2px 0 0; color: var(--muted); font-size: 14px; }

/* contact */
.contact-list {
  list-style: none; padding: 0; margin: 16px 0;
  font-family: var(--mono);
  font-size: 14.5px;
}
.contact-list li {
  display: flex; gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.contact-list .k {
  color: var(--muted);
  width: 70px;
  flex-shrink: 0;
}

/* footer */
footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
}