/* Dark only. One accent (emerald) reserved for IDs, links, the active state and the logo's single point. */
:root {
  --bg: #070b11;
  --surface: #0c121a;
  --surface-2: #101822;
  --line: #1a2430;
  --line-2: #243142;
  --fg: #e6ebf0;
  --fg-2: #b4bfca;
  --muted: #7a8794;
  --accent: #34d399;
  --accent-dim: rgba(52, 211, 153, 0.12);
  --high: #f2846b;
  --mid: #e6b968;
  --sans: "Inter", "Noto Sans KR", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Noto Sans KR", monospace;
  --wrap: 1080px;
  color-scheme: dark;
}
html[lang="ko"] { --sans: "Noto Sans KR", "Inter", system-ui, sans-serif; }

* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg);
  /* faint grid, fades out toward the bottom of each screen */
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 48px 48px;
  background-attachment: fixed;
  overflow-x: hidden;
}
/* Korean wraps at spaces only; overflow-wrap still rescues a single string wider than its box. */
html[lang="ko"], html[lang="ko"] * { word-break: keep-all; overflow-wrap: break-word; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.mono { font-family: var(--mono); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ── pill navigation ───────────────────────────── */
.pill {
  position: fixed;
  top: 16px;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: fit-content;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: calc(100vw - 24px);
  padding: 5px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: rgba(10, 15, 22, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.pill .links { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; min-width: 0; }
.pill .links::-webkit-scrollbar { display: none; }
.pill a {
  flex: none;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--fg-2);
  font: 500 0.84rem var(--sans);
  white-space: nowrap;
  transition: color 0.2s, background-color 0.2s;
}
.pill a:hover { color: var(--fg); text-decoration: none; }
.pill a.on { color: var(--bg); background: var(--accent); }
.pill .lang { flex: none; display: flex; align-items: center; gap: 2px; padding: 0 6px 0 8px; margin-left: 2px; border-left: 1px solid var(--line-2); font: 500 0.75rem var(--mono); color: var(--muted); }
.pill .lang button { background: none; border: 0; padding: 4px 4px; font: inherit; color: var(--muted); cursor: pointer; border-radius: 4px; }
.pill .lang button:hover { color: var(--fg); }
.pill .lang button.on { color: var(--accent); font-weight: 600; }

/* ── home ──────────────────────────────────────── */
.home {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 96px 24px 72px;
}
.home .inner { display: flex; align-items: center; gap: clamp(28px, 6vw, 72px); }
.home .mark { height: clamp(220px, 46vh, 400px); width: auto; flex: none; filter: drop-shadow(0 12px 40px rgba(0, 0, 0, 0.55)); }
.home .name { margin: 0; font: 800 clamp(3.4rem, 10vw, 7.2rem)/0.95 "Inter", system-ui, sans-serif; letter-spacing: -0.045em; }
.home .kname { margin: 10px 0 0; font: 500 1.05rem var(--sans); color: var(--fg-2); letter-spacing: 0.02em; }
.home .line { margin: 18px 0 0; font-size: clamp(1rem, 1.6vw, 1.15rem); color: var(--fg-2); max-width: 34ch; }
.home .copy { margin: 22px 0 0; font: 0.75rem var(--mono); color: var(--muted); letter-spacing: 0.04em; }
.home .scroll { position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%); font: 0.72rem var(--mono); color: var(--muted); letter-spacing: 0.16em; text-transform: uppercase; }
.home .scroll:hover { color: var(--accent); text-decoration: none; }

/* ── stats ─────────────────────────────────────── */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 14px; background: rgba(12, 18, 26, 0.7); }
.stats > div { padding: 22px 24px; }
.stats > div + div { border-left: 1px solid var(--line); }
.stats .n { font: 600 2.2rem/1 var(--mono); color: var(--fg); letter-spacing: -0.02em; }
.stats .n.accent { color: var(--accent); }
.stats .l { margin-top: 8px; font: 0.72rem var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; }

.lead { margin: 64px 0 0; max-width: 46rem; font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.6; color: var(--fg-2); }
.lead p { margin: 0 0 10px; }
.lead p:first-child { color: var(--fg); }

/* ── sections ──────────────────────────────────── */
.sec { padding-top: 112px; }
.sec .label { font: 500 0.74rem var(--mono); color: var(--accent); letter-spacing: 0.18em; text-transform: uppercase; }
.sec h2 { margin: 12px 0 0; font: 800 clamp(2rem, 4.6vw, 3rem)/1.1 var(--sans); letter-spacing: -0.03em; }
.sec .desc { margin: 14px 0 0; max-width: 44rem; color: var(--fg-2); }
.sec .body { margin-top: 40px; }
.sub { margin: 48px 0 14px; font: 500 0.74rem var(--mono); color: var(--muted); letter-spacing: 0.14em; text-transform: uppercase; }

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(16, 24, 34, 0.9), rgba(12, 18, 26, 0.9));
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: rgba(52, 211, 153, 0.55); }

/* featured findings */
.feat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feat .card { padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.feat .top { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.feat .top a { font: 600 0.88rem var(--mono); }
.feat dl { margin: 0; display: grid; gap: 12px; }
.feat dt { font: 500 0.66rem var(--mono); color: var(--muted); letter-spacing: 0.16em; }
.feat dd { margin: 3px 0 0; font-size: 0.93rem; color: var(--fg-2); }
.feat dd.target { font: 600 0.92rem var(--mono); color: var(--fg); }

.badges { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.badge { font: 500 0.68rem/1 var(--mono); padding: 5px 7px; border-radius: 6px; border: 1px solid var(--line-2); color: var(--fg-2); white-space: nowrap; }
.badge.high { color: var(--high); border-color: rgba(242, 132, 107, 0.4); background: rgba(242, 132, 107, 0.07); }
.badge.critical { color: #ff5c5c; border-color: rgba(255, 92, 92, 0.5); background: rgba(255, 92, 92, 0.1); font-weight: 600; }
.badge.medium, .badge.moderate { color: var(--mid); border-color: rgba(230, 185, 104, 0.4); }
.badge.low { color: #8aa0b4; border-color: rgba(138, 160, 180, 0.4); }
.badge.bounty { color: var(--accent); border-color: rgba(52, 211, 153, 0.4); background: var(--accent-dim); }

/* grouped table */
.groups { display: grid; gap: 28px; }
.group h3 { margin: 0 0 6px; font: 600 1rem var(--sans); }
.row { display: grid; grid-template-columns: 13rem 1fr auto; gap: 6px 20px; align-items: baseline; padding: 14px 0; border-top: 1px solid var(--line); }
.group .row:last-child { border-bottom: 1px solid var(--line); }
.row .id { font: 500 0.86rem var(--mono); overflow-wrap: anywhere; }
.row .repo { font-weight: 600; }
.row .what { color: var(--fg-2); }
.pending { margin: 22px 0 0; font: 0.82rem var(--mono); color: var(--muted); }
.pending b { color: var(--accent); font-weight: 600; }

/* projects */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.proj { padding: 22px; display: flex; flex-direction: column; gap: 10px; color: inherit; }
.proj:hover { text-decoration: none; }
.proj .h { display: flex; justify-content: space-between; gap: 10px; font-weight: 600; font-size: 1.05rem; }
.proj .h .arr { color: var(--accent); font-family: var(--mono); }
.proj p { margin: 0; color: var(--fg-2); font-size: 0.93rem; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font: 0.7rem var(--mono); padding: 3px 8px; border-radius: 999px; background: var(--accent-dim); color: var(--accent); }

/* experience */
.tl { position: relative; padding-left: 26px; }
.tl::before { content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 1px; background: var(--line-2); }
.tl .item { position: relative; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 20px; }
.tl .item::before { content: ""; position: absolute; left: -26px; top: 8px; width: 11px; height: 11px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); }
.tl .org { font-weight: 600; font-size: 1.1rem; }
.tl .role { color: var(--fg-2); }
.tl .period { font: 0.82rem var(--mono); color: var(--muted); }
.note { margin: 18px 0 0; color: var(--muted); font-size: 0.92rem; }

/* credentials */
.creds { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.creds .card { padding: 20px 22px; }
.creds h3 { margin: 0 0 8px; font: 500 0.72rem var(--mono); color: var(--muted); letter-spacing: 0.14em; text-transform: uppercase; }
.creds ul { list-style: none; margin: 0; padding: 0; }
.creds li { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; border-top: 1px solid var(--line); }
.creds li:first-child { border-top: 0; }
.creds .yr { font: 0.8rem var(--mono); color: var(--muted); }

/* contact */
.contact { display: flex; flex-wrap: wrap; gap: 12px; }
.contact a { display: inline-flex; align-items: center; gap: 10px; padding: 14px 18px; color: var(--fg); font: 500 0.92rem var(--mono); }
.contact a:hover { text-decoration: none; }
.contact svg { width: 18px; height: 18px; stroke: var(--accent); fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }

footer { margin: 120px 0 0; padding: 28px 0 40px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font: 0.75rem var(--mono); color: var(--muted); }

.proj .num { font: 500 0.72rem var(--mono); color: var(--muted); letter-spacing: 0.1em; }
.proj:hover .arr { transform: translateX(3px); }
.proj .arr { transition: transform 0.2s; }

/* project detail */
.detail { padding-top: 112px; }
.back { display: inline-block; font: 500 0.82rem var(--mono); color: var(--muted); }
.back:hover { color: var(--accent); text-decoration: none; }
.dhead { margin-top: 28px; }
.dhead .label { font: 500 0.74rem var(--mono); color: var(--accent); letter-spacing: 0.18em; }
.dhead h1 { margin: 12px 0 0; font: 800 clamp(2.2rem, 5.4vw, 3.6rem)/1.08 "Inter", var(--sans); letter-spacing: -0.035em; }
.lede { margin: 18px 0 0; max-width: 44rem; font-size: clamp(1.05rem, 1.8vw, 1.2rem); color: var(--fg-2); }
.dhead .tags { margin-top: 18px; }
.btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.btn { padding: 9px 16px; border: 1px solid var(--line-2); border-radius: 999px; font: 500 0.84rem var(--mono); color: var(--fg); transition: border-color 0.2s, color 0.2s; }
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.dsec { margin-top: 64px; }
.dsec .sub { margin-top: 0; }
.dsec > p { max-width: 46rem; color: var(--fg-2); font-size: 1.02rem; }
.fgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.feat-item { padding: 20px 22px; }
.feat-item h3 { margin: 0 0 6px; font: 600 1rem var(--sans); }
.feat-item p { margin: 0; color: var(--fg-2); font-size: 0.93rem; }
.flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; counter-reset: none; }
.flow li { display: flex; gap: 12px; align-items: baseline; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: rgba(12, 18, 26, 0.7); font-size: 0.93rem; }
.flow .k { font: 600 0.78rem var(--mono); color: var(--accent); flex: none; }
.principles { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.principles li { position: relative; padding-left: 22px; color: var(--fg-2); }
.principles li::before { content: ""; position: absolute; left: 4px; top: 0.7em; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 88px; }
.pager a { padding: 18px 20px; color: var(--fg); font-weight: 600; display: flex; flex-direction: column; gap: 4px; }
.pager a:hover { text-decoration: none; }
.pager .next { text-align: right; }
.pager .l { font: 500 0.72rem var(--mono); color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; }

/* reveal on scroll */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .card { transition: none; }
}

/* ── narrow screens ────────────────────────────── */
@media (max-width: 900px) {
  .feat, .grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats > div:nth-child(3) { border-left: 0; }
  .stats > div:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .row { grid-template-columns: 1fr auto; }
  .row .id { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .home { padding: 88px 16px 72px; }
  .home .inner { flex-direction: column; text-align: center; gap: 24px; }
  .home .line { margin-left: auto; margin-right: auto; }
  .home .mark { height: clamp(170px, 30vh, 230px); }
  .pill a { padding: 6px 10px; font-size: 0.8rem; }
  .stats > div { padding: 18px 16px; }
  .stats .n { font-size: 1.8rem; }
  .row { grid-template-columns: 1fr; }
  .creds { grid-template-columns: 1fr; }
  .fgrid { grid-template-columns: 1fr; }
  .detail { padding-top: 88px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .sec { padding-top: 88px; }
  .contact a { flex: 1 1 100%; }
}
/* Phones: every pill item stays visible without scrolling inside the pill. */
@media (max-width: 440px) {
  .pill { gap: 0; padding: 4px; }
  .pill .links { gap: 0; }
  .pill a { padding: 6px 6px; font-size: 0.72rem; }
  .pill .lang { padding: 0 3px 0 6px; font-size: 0.7rem; }
  .pill .lang button { padding: 4px 2px; }
}

/* reference links (GHSA ids, PR numbers) never split across lines */
.row a { white-space: nowrap; }

/* target repository stars in research rows and featured cards */
.stars { font: 500 0.72rem var(--mono); color: var(--mid); white-space: nowrap; letter-spacing: 0; }
.sub .asof { margin-left: 12px; text-transform: none; letter-spacing: 0; color: var(--muted); opacity: 0.8; }