:root {
  --bg: #0a131d;
  --screen: #102030;
  --panel: #0f1b28;
  --line: #1e3044;
  --fg: #dbe4ee;
  --dim: #7f93a8;
  --faint: #3d5266;
  --amber: #f2b13a;
  --green: #9fd36b;
  --pink: #e7799d;
  --blue: #79b8ff;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "D2Coding", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", sans-serif;
}
* { box-sizing: border-box; }
html { color-scheme: dark; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 16px; line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 34px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--mono); }
code { background: var(--panel); border: 1px solid var(--line); padding: 1px 6px; border-radius: 4px; font-size: 0.86em; }
kbd {
  font-family: var(--mono); font-size: 0.8em; white-space: nowrap;
  background: #16273a; color: var(--fg);
  border: 1px solid var(--line); border-bottom-width: 3px;
  border-radius: 5px; padding: 1px 7px;
}
.dim { color: var(--dim); }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* 배경 격자 — 화면 픽셀의 은유 */
.grid-bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(121,184,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(121,184,255,0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
}

nav {
  position: sticky; top: 0; z-index: 10;
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  background: rgba(10,19,29,0.72);
  border-bottom: 1px solid rgba(30,48,68,0.6);
}
nav .wrap { display: flex; align-items: center; gap: 22px; height: 54px; font-family: var(--mono); font-size: 13.5px; }
nav .logo { color: var(--fg); font-weight: 700; letter-spacing: 0.18em; }
nav .logo span { color: var(--amber); }
nav .links { display: flex; gap: 20px; margin-left: auto; }
nav .links a { color: var(--dim); }
nav .links a:hover { color: var(--fg); text-decoration: none; }
@media (max-width: 860px) { nav .links a:not(.gh) { display: none; } }

/* hero */
.hero { padding: 72px 0 40px; display: grid; grid-template-columns: 1fr 1.35fr; gap: 48px; align-items: center; }
@media (max-width: 960px) { .hero { grid-template-columns: 1fr; padding-top: 44px; } }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--dim); margin: 0 0 18px; }
.eyebrow .p { color: var(--green); }
.eyebrow .t { color: var(--pink); }
h1 {
  font-family: var(--mono); font-size: clamp(64px, 9vw, 112px); line-height: 0.95;
  margin: 0 0 18px; letter-spacing: 0.06em; font-weight: 800;
  background: linear-gradient(180deg, #ffffff 10%, #9fb6cc 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.acro { font-family: var(--mono); font-size: 15px; color: var(--dim); margin: 0 0 26px; min-height: 1.7em; }
.acro b { color: var(--amber); font-weight: 700; }
.caret { display: inline-block; width: 0.6em; height: 1.1em; vertical-align: -0.18em; background: var(--fg); margin-left: 2px; animation: blink 1.05s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.lead { font-size: 18px; margin: 0 0 14px; }
.lead em { font-style: normal; color: var(--amber); }
.sub { color: var(--dim); margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.asof { font-family: var(--mono); font-size: 12px; color: var(--faint); margin: 22px 0 0; }
.btn {
  font-family: var(--mono); font-size: 14px; padding: 10px 18px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); color: var(--fg); background: var(--panel);
  transition: border-color .2s, transform .2s;
}
.btn:hover { text-decoration: none; border-color: var(--dim); transform: translateY(-1px); }
.btn.primary { background: var(--amber); color: #1a1205; border-color: var(--amber); font-weight: 700; }

/* 모니터 */
.monitor {
  position: relative; border-radius: 14px; padding: 12px;
  background: linear-gradient(160deg, #1b2b3d, #0c1520);
  border: 1px solid #263a50;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.7), 0 0 120px -30px rgba(121,184,255,0.25);
}
.monitor .bar { display: flex; align-items: center; gap: 7px; padding: 0 4px 10px; font-family: var(--mono); font-size: 11.5px; color: var(--dim); }
.monitor .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--faint); }
.monitor .bar .title { margin-left: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.monitor .bar .rec { margin-left: auto; color: var(--pink); white-space: nowrap; }
.monitor .bar .rec::before { content: "● "; animation: blink 1.6s steps(1) infinite; }
.screen { position: relative; border-radius: 6px; overflow: hidden; background: var(--screen); aspect-ratio: 1024 / 640; }
.screen video { display: block; width: 100%; height: 100%; object-fit: cover; }
.screen::after { /* 아주 옅은 주사선 */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,0.10) 0 1px, transparent 1px 3px);
}

section { padding: 84px 0 0; scroll-margin-top: 40px; }
.sec-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 10px; }
.sec-num { font-family: var(--mono); color: var(--amber); font-size: 13px; }
h2 { font-size: clamp(26px, 3.2vw, 36px); margin: 0; letter-spacing: -0.01em; line-height: 1.25; }
.sec-lead { color: var(--dim); max-width: 780px; margin: 10px 0 36px; }

/* 부팅 사슬 */
.chain { display: grid; grid-template-columns: repeat(6, 1fr); position: relative; }
@media (max-width: 900px) { .chain { grid-template-columns: repeat(3, 1fr); row-gap: 18px; } }
@media (max-width: 520px) { .chain { grid-template-columns: repeat(2, 1fr); } }
.node { position: relative; padding: 0 8px; }
.node .box {
  border: 1px solid var(--line); border-radius: 10px; padding: 14px 14px 12px; background: var(--panel);
  min-height: 140px; transition: border-color .4s, box-shadow .4s, transform .4s;
}
.node .k { font-family: var(--mono); font-size: 11px; color: var(--dim); text-transform: uppercase; letter-spacing: 0.12em; }
.node .n { font-family: var(--mono); font-size: 17px; font-weight: 700; margin: 4px 0 6px; }
.node .d { font-size: 13px; color: var(--dim); line-height: 1.5; }
.node.ours .n { color: var(--amber); }
.node.ours.lit .box { border-color: var(--amber); box-shadow: 0 0 0 1px var(--amber), 0 0 34px -6px rgba(242,177,58,0.55); transform: translateY(-3px); }
.node:not(.ours).lit .box { border-color: var(--blue); box-shadow: 0 0 0 1px var(--blue), 0 0 34px -6px rgba(121,184,255,0.5); transform: translateY(-3px); }
.node + .node::before { content: ""; position: absolute; left: -6px; top: 70px; width: 12px; height: 2px; background: var(--faint); }
@media (max-width: 900px) { .node + .node::before { display: none; } }
.legend { display: flex; gap: 22px; margin-top: 18px; font-size: 13px; color: var(--dim); flex-wrap: wrap; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 7px; }
.legend .o i { background: var(--amber); }
.legend .b i { background: var(--blue); }
.serial {
  margin-top: 22px; font-family: var(--mono); font-size: 12.5px; color: var(--dim);
  background: #08111a; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px;
  height: 136px; overflow: hidden; line-height: 1.6;
}
.serial .ln { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; animation: lnin .3s ease; }
.serial .ln b { color: var(--green); font-weight: 500; margin-right: 8px; }
@keyframes lnin { from { opacity: 0; transform: translateX(-6px); } }

/* 기능 영상 — 게스트 글자를 읽을 수 있게 영상은 전체 폭이다 */
.feat { margin-bottom: 84px; }
.feat .media .monitor { padding: 8px; border-radius: 12px; }
.feat .text { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 40px; margin-top: 22px; }
@media (max-width: 860px) { .feat .text { grid-template-columns: 1fr; } }
.feat h3 { font-size: 23px; margin: 0 0 10px; }
.feat h3 .tag { font-family: var(--mono); font-size: 12px; color: var(--amber); display: block; margin-bottom: 6px; letter-spacing: 0.08em; }
.feat p { color: #b9c7d5; margin: 0; }
.feat ul { margin: 0; padding: 0; list-style: none; }
.feat li { padding: 6px 0; border-top: 1px dashed var(--line); font-size: 14.5px; color: var(--dim); }
.feat li:first-child { border-top: 0; }
.feat li b { color: var(--fg); font-weight: 600; }

/* 숫자 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--panel); padding: 26px 22px; }
.stat .v { font-family: var(--mono); font-size: clamp(32px, 4vw, 46px); font-weight: 800; line-height: 1.1; }
.stat .v small { font-size: 0.45em; color: var(--dim); font-weight: 500; margin-left: 4px; }
.stat .l { font-size: 13.5px; color: var(--dim); margin-top: 6px; }

/* 원칙 */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; counter-reset: s; }
@media (max-width: 860px) { .flow { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .flow { grid-template-columns: 1fr; } }
.flow div { border-top: 2px solid var(--amber); padding: 14px 4px 0; }
.flow div::before { counter-increment: s; content: "0" counter(s); font-family: var(--mono); font-size: 12px; color: var(--amber); }
.flow h4 { margin: 4px 0 6px; font-size: 17px; }
.flow p { margin: 0; font-size: 14px; color: var(--dim); }
blockquote {
  margin: 40px 0 0; padding: 20px 24px; border-left: 3px solid var(--amber);
  background: linear-gradient(90deg, rgba(242,177,58,0.08), transparent 70%);
  font-size: 18px; border-radius: 0 10px 10px 0;
}
blockquote small { display: block; font-size: 13px; color: var(--dim); margin-top: 8px; }

/* 타임라인 */
.tl { position: relative; margin-left: 8px; padding-left: 28px; border-left: 1px solid var(--line); }
.tl .it { position: relative; padding: 0 0 18px; display: grid; grid-template-columns: 96px 1fr; gap: 6px 18px; }
@media (max-width: 600px) { .tl .it { grid-template-columns: 1fr; } }
.tl .it::before {
  content: ""; position: absolute; left: -33px; top: 8px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--faint); transition: border-color .3s, background .3s;
}
.tl .it.in::before { border-color: var(--amber); background: var(--amber); }
.tl .date { font-family: var(--mono); font-size: 12.5px; color: var(--dim); padding-top: 3px; }
.tl .name { font-weight: 700; font-size: 15px; }
.tl .name .id { font-family: var(--mono); font-size: 11px; color: var(--dim); margin-left: 8px; font-weight: 400; }
.tl .what { color: var(--dim); font-size: 14px; }
.tl.collapsed .it:nth-child(n+13) { display: none; }
.more { margin: 6px 0 0 36px; }

/* 실행 */
pre {
  background: #08111a; border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; margin: 0 0 14px;
}
pre .c { color: var(--faint); }
pre .p { color: var(--green); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } }
.two h4 { font-family: var(--mono); font-size: 13px; color: var(--blue); margin: 0 0 8px; font-weight: 500; }

/* 전체 기능 */
.fbar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 20px; margin: 0 0 26px; font-size: 14px; }
.fbar input[type=search] {
  flex: 1 1 320px; font-family: var(--mono); font-size: 14px; color: var(--fg);
  background: #08111a; border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; outline: none;
}
.fbar input[type=search]:focus { border-color: var(--amber); }
.fbar label { color: var(--dim); cursor: pointer; user-select: none; }
.fgroup { margin: 0 0 34px; }
.fgroup h3 { font-size: 17px; margin: 0 0 4px; display: flex; align-items: baseline; gap: 10px; }
.fgroup h3 .n { font-family: var(--mono); font-size: 12px; color: var(--dim); font-weight: 400; }
.fgroup > p { margin: 0 0 12px; color: var(--dim); font-size: 14px; }
.ftable { width: 100%; border-collapse: collapse; font-size: 14px; }
.ftable td { padding: 8px 10px; border-top: 1px solid var(--line); vertical-align: top; }
.ftable tr:hover td { background: rgba(121,184,255,0.03); }
.ftable td.k { width: 34%; font-family: var(--mono); font-size: 13px; color: var(--fg); }
.ftable td.d { color: #b4c2d0; }
.ftable td.s { width: 92px; text-align: right; font-family: var(--mono); font-size: 11.5px; color: var(--faint); white-space: nowrap; }
@media (max-width: 680px) {
  .ftable td { display: block; border-top: 0; padding: 2px 6px; }
  .ftable tr { display: block; border-top: 1px solid var(--line); padding: 8px 0; }
  .ftable td.k, .ftable td.s { width: auto; text-align: left; }
}
.new { font-family: var(--mono); font-size: 10px; font-weight: 700; color: #1a1205; background: var(--amber); border-radius: 3px; padding: 0 5px; margin-left: 6px; vertical-align: 1px; }
mark { background: rgba(242,177,58,0.35); color: inherit; border-radius: 2px; }

footer { margin-top: 96px; padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--dim); font-size: 13.5px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; }

/* 바닥의 상태 줄 — TARS 화면 맨 아래 줄을 흉내낸다 */
.status {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; height: 30px;
  background: var(--screen); border-top: 1px solid #1a2d42;
  font-family: var(--mono); font-size: 12.5px; color: #b8c6d4;
  display: flex; align-items: center; gap: 16px; padding: 0 18px;
}
.status .off { color: var(--faint); }
.status .copy { color: #1a1205; background: var(--amber); padding: 0 6px; border-radius: 3px; display: none; }
.status .copy.on { display: inline; }
.status .right { margin-left: auto; display: flex; gap: 16px; }
.status .bat { color: var(--green); }
.status .sec { color: var(--dim); }

.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .caret, .monitor .bar .rec::before, .serial .ln { animation: none; }
  html { scroll-behavior: auto; }
}

/* grid 칸이 긴 한 줄(pre · nowrap 제목)에 밀려 화면보다 넓어지지 않게 */
.hero > *, .two > *, .feat .text > *, .chain > *, .flow > * { min-width: 0; }
.acro { overflow-wrap: anywhere; }
@media (max-width: 520px) {
  .wrap { padding: 0 16px; }
  .status span:nth-child(3), .status span:nth-child(4) { display: none; }
}

/* 한글을 띄어쓰기 자리에서만 줄바꿈한다. 띄어쓰기 없이 칸보다 긴 덩어리
   (긴 코드 · 경로)만 overflow-wrap이 마지막에 쪼갠다. */
body { word-break: keep-all; overflow-wrap: break-word; }

/* 작업 내역의 릴리스 줄 — 서브프로젝트(앰버)와 색으로 가른다 */
.new.rel { background: var(--green); }
.tl .it.rel.in::before { border-color: var(--green); background: var(--green); }
.tl .it.rel .name { color: var(--green); }