:root {
  --ink: #28272c;          /* logo charcoal */
  --ink-deep: #1d1c20;
  --paper: #f5f4f1;
  --paper-2: #ecebe7;
  --card: #ffffff;
  --text: #28272c;
  --muted: #6e6c74;
  --line: rgba(40, 39, 44, 0.12);
  --on-ink: #f5f4f1;
  --on-ink-muted: #a3a1aa;
  --on-ink-line: rgba(245, 244, 241, 0.14);
  --accent: #c8ff3d;       /* signal lime, used on dark only */
  --radius: 18px;
  --maxw: 1200px;
  --font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3, p, ol, ul, dl, dd { margin: 0; }
ol, ul { padding: 0; list-style: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--on-ink); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 52px; padding: 0 26px;
  border-radius: 999px; border: 1px solid transparent;
  background: var(--accent); color: var(--ink-deep);
  font-weight: 700; font-size: 16px; white-space: nowrap;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--sm { height: 40px; padding: 0 18px; font-size: 14px; background: var(--ink); color: var(--on-ink); }
.btn--ghost { background: transparent; color: var(--on-ink); border-color: var(--on-ink-line); }
.btn--ghost:hover { border-color: var(--on-ink); }
.btn--light { background: transparent; color: var(--on-ink); border-color: var(--on-ink-line); height: 48px; }
.btn--light:hover { border-color: var(--on-ink); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.logo { display: inline-flex; align-items: center; gap: 8px; }
.logo img { height: 34px; width: auto; border-radius: 3px; }
.logo__studio { font-weight: 700; font-size: 15px; letter-spacing: 0.02em; color: var(--muted); }
.nav__links { display: flex; gap: 32px; font-size: 15px; font-weight: 500; color: var(--muted); }
.nav__links a:hover { color: var(--text); }
.nav__right { display: flex; align-items: center; gap: 12px; }

.lang { display: inline-flex; padding: 3px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); }
.lang button {
  border: 0; background: transparent; padding: 5px 10px; border-radius: 999px;
  font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--muted);
}
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--on-ink); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: var(--ink);
  color: var(--on-ink);
  padding: 96px 0 0;
}
.hero::before {
  /* faint signal grid */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--on-ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--on-ink-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 10%, transparent 75%);
  opacity: .55;
}
.hero__grid { position: relative; display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 13px; color: var(--on-ink-muted);
  padding: 7px 14px; border: 1px solid var(--on-ink-line); border-radius: 999px;
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 rgba(200, 255, 61, .6); animation: ping 2s infinite; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(200, 255, 61, .55); } 80%, 100% { box-shadow: 0 0 0 10px rgba(200, 255, 61, 0); } }

.hero__title {
  margin-top: 28px;
  font-size: clamp(38px, 5.6vw, 72px);
  line-height: 1.12; font-weight: 800; letter-spacing: -0.035em;
}
.hero__title em { font-style: normal; color: var(--accent); }
.hero__lead { margin-top: 24px; max-width: 34em; font-size: 18px; color: var(--on-ink-muted); }
.hero__actions { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 12px; }

/* console */
.console {
  background: var(--ink-deep);
  border: 1px solid var(--on-ink-line);
  border-radius: var(--radius);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .6);
  overflow: hidden;
  min-width: 0;
}
.console__bar { display: flex; align-items: center; gap: 7px; padding: 14px 16px; border-bottom: 1px solid var(--on-ink-line); }
.console__bar span { width: 10px; height: 10px; border-radius: 50%; background: #45434b; }
.console__bar p { margin-left: 10px; font-family: var(--mono); font-size: 12px; color: var(--on-ink-muted); }
.console__body {
  margin: 0; padding: 20px 20px 24px;
  height: 320px; overflow: hidden;
  font-family: var(--mono); font-size: 13px; line-height: 1.85;
  color: #d6d4dc; white-space: pre-wrap; word-break: break-all;
}
.console__body .c-dim { color: #75737c; }
.console__body .c-ok { color: var(--accent); }
.console__body .c-key { color: #9ec5ff; }
.console__body .caret { display: inline-block; width: 8px; height: 15px; background: var(--accent); vertical-align: -2px; animation: blink 1s steps(2) infinite; }
@keyframes blink { to { opacity: 0; } }

/* stats */
.stats {
  position: relative;
  margin-top: 88px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--on-ink-line);
}
.stats > div { padding: 28px 0 40px; }
.stats > div + div { padding-left: 28px; border-left: 1px solid var(--on-ink-line); }
.stats dt { font-size: 14px; color: var(--on-ink-muted); }
.stats dd { margin-top: 8px; font-size: clamp(24px, 3vw, 36px); font-weight: 800; letter-spacing: -0.03em; }
.stats dd span { color: var(--accent); }

/* ---------- Marquee ---------- */
.marquee { overflow: hidden; background: var(--ink-deep); color: var(--on-ink-muted); border-top: 1px solid var(--on-ink-line); }
.marquee__track { display: flex; width: max-content; animation: marquee 40s linear infinite; }
.marquee__track span { padding: 18px 28px; font-family: var(--mono); font-size: 13px; letter-spacing: .04em; white-space: nowrap; }
.marquee__track span::before { content: "◦"; margin-right: 28px; color: var(--accent); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- Sections ---------- */
.section { padding: 128px 0; }
.section--alt { background: var(--paper-2); }
.section__head { max-width: 720px; margin-bottom: 64px; }
.section__head--row { max-width: none; display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; }
.kicker { font-family: var(--mono); font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.kicker--light { color: var(--on-ink-muted); }
.section h2, .contact h2 {
  font-size: clamp(30px, 4vw, 48px); line-height: 1.2; font-weight: 800; letter-spacing: -0.03em;
}
.section__lead { margin-top: 20px; font-size: 18px; color: var(--muted); }
.section__note { max-width: 300px; font-size: 14px; color: var(--muted); text-align: right; }

/* services */
.services { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.service {
  position: relative;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 36px 36px 32px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.service:hover { transform: translateY(-3px); box-shadow: 0 24px 48px -28px rgba(40, 39, 44, .35); }
.service__no { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.service__icon { position: absolute; top: 32px; right: 32px; width: 44px; height: 44px; border-radius: 12px; background: var(--ink); color: var(--accent); display: grid; place-items: center; }
.service__icon svg { width: 22px; height: 22px; }
.service h3 { margin-top: 48px; font-size: 24px; font-weight: 750; letter-spacing: -0.02em; }
.service p { margin-top: 10px; color: var(--muted); }
.service ul { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  font-family: var(--mono); font-size: 12px; line-height: 1.6;
  background: var(--paper); color: var(--text); border: 1px solid var(--line);
}

/* work */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.filters button {
  padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); background: transparent;
  font-size: 14px; font-weight: 600; color: var(--muted);
  transition: all .2s ease;
}
.filters button:hover { color: var(--text); border-color: var(--text); }
.filters button[aria-selected="true"] { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }

.projects { border-top: 1px solid var(--line); }
.project { border-bottom: 1px solid var(--line); }
.project[hidden] { display: none; }
.project__row {
  width: 100%; display: grid; align-items: center; gap: 24px;
  grid-template-columns: 56px 1.4fr 1fr 120px 28px;
  padding: 28px 4px; text-align: left;
  background: none; border: 0;
}
.project__no { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.project__name { font-size: 22px; font-weight: 750; letter-spacing: -0.02em; }
.project__summary { display: block; margin-top: 4px; font-size: 15px; font-weight: 400; color: var(--muted); }
.project__client { font-size: 14px; color: var(--muted); }
.project__meta { display: none; margin-top: 8px; font-family: var(--mono); font-size: 12px; font-weight: 400; color: var(--muted); }
.project__client b { display: block; font-weight: 600; color: var(--text); }
.project__year { font-family: var(--mono); font-size: 13px; color: var(--muted); text-align: right; }
.project__toggle {
  width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--line);
  display: grid; place-items: center; font-size: 16px; line-height: 1;
  transition: transform .3s ease, background-color .2s ease, color .2s ease;
}
.project__row:hover .project__name { text-decoration: underline; text-underline-offset: 5px; text-decoration-thickness: 1px; }
.project.is-open .project__toggle { transform: rotate(45deg); background: var(--ink); color: var(--on-ink); border-color: var(--ink); }

.project__detail { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .35s ease; }
.project.is-open .project__detail { grid-template-rows: 1fr; }
.project__detail > div { overflow: hidden; }
.project__body {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  margin: 0 4px 32px 84px; padding: 28px 32px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
}
.project__body h4 { margin: 0 0 12px; font-size: 13px; font-weight: 600; color: var(--muted); }
.project__body ul.scope li { position: relative; padding-left: 16px; margin: 4px 0; font-size: 15px; }
.project__body ul.scope li::before { content: ""; position: absolute; left: 0; top: .72em; width: 6px; height: 2px; background: var(--text); }
.project__body .highlight { font-size: 15px; }
.project__body .stack { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 6px; }
.project__body .platforms { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 6px; }

/* stack */
.stack__groups { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); }
.stack__group { padding: 28px 24px 8px 0; }
.stack__group + .stack__group { padding-left: 24px; border-left: 1px solid var(--line); }
.stack__group h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.stack__group ul { display: flex; flex-wrap: wrap; gap: 6px; }

/* process */
.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.process li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.process__no { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.process h3 { margin-top: 36px; font-size: 20px; font-weight: 750; letter-spacing: -0.02em; }
.process p { margin-top: 8px; font-size: 15px; color: var(--muted); }

/* contact */
.contact { background: var(--ink); color: var(--on-ink); padding: 128px 0; position: relative; overflow: hidden; }
.contact::after {
  content: ""; position: absolute; right: -180px; bottom: -180px; width: 560px; height: 560px; border-radius: 50%;
  background: repeating-radial-gradient(circle, transparent 0 38px, var(--on-ink-line) 38px 39px);
  pointer-events: none;
}
.contact__inner { position: relative; z-index: 1; }
.contact h2 { max-width: 14em; font-size: clamp(34px, 5vw, 60px); }
.contact h2 em { font-style: normal; color: var(--accent); }
.contact__lead { margin-top: 20px; max-width: 34em; font-size: 18px; color: var(--on-ink-muted); }
.contact__actions { margin-top: 44px; display: flex; flex-wrap: wrap; align-items: center; gap: 16px 24px; }
.mail {
  font-size: clamp(22px, 3.4vw, 40px); font-weight: 750; letter-spacing: -0.02em;
  border-bottom: 2px solid var(--accent); padding-bottom: 2px;
  overflow-wrap: anywhere;
}
.mail:hover { color: var(--accent); }
.contact__hints { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 8px; }
.contact__hints li { padding: 8px 14px; border: 1px solid var(--on-ink-line); border-radius: 999px; font-size: 14px; color: var(--on-ink-muted); }

/* footer */
.footer { background: var(--ink-deep); color: var(--on-ink-muted); font-size: 13px; }
.footer__inner { padding-top: 40px; padding-bottom: 40px; display: grid; gap: 24px; }
.footer__brand { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.footer__logo { height: 16px; width: auto; opacity: .9; }
.footer__brand a:hover, .footer__biz a:hover { color: var(--on-ink); }
.footer__biz { margin: 0; display: flex; flex-wrap: wrap; gap: 8px 28px; padding-top: 24px; border-top: 1px solid var(--on-ink-line); }
.footer__biz div { display: flex; gap: 8px; }
.footer__biz dt { color: #75737c; }
.footer__biz dd { margin: 0; color: var(--on-ink-muted); }
.footer__copy { color: #75737c; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px);
  padding: 12px 20px; border-radius: 999px; background: var(--card); color: var(--ink);
  font-size: 14px; font-weight: 600; box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
  opacity: 0; pointer-events: none; transition: all .25s ease; z-index: 200;
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero__grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats > div:nth-child(3) { padding-left: 0; border-left: 0; }
  .stats > div:nth-child(n+3) { border-top: 1px solid var(--on-ink-line); }
  .stack__groups { grid-template-columns: repeat(2, 1fr); }
  .stack__group:nth-child(3) { padding-left: 0; border-left: 0; }
  .process { grid-template-columns: repeat(2, 1fr); }
  .project__row { grid-template-columns: 40px 1fr 80px 28px; }
  .project__client { display: none; }
  .project__meta { display: block; }
  .project__body { margin-left: 4px; }
}

@media (max-width: 760px) {
  .wrap { padding: 0 16px; }
  .nav__links, .nav__right .btn { display: none; }
  .hero { padding-top: 56px; }
  .hero__lead { font-size: 16px; }
  .console__body { height: 240px; font-size: 12px; }
  .stats { margin-top: 56px; }
  .stats > div { padding: 20px 0 24px; }
  .stats > div + div { padding-left: 16px; }
  .section, .contact { padding: 88px 0; }
  .section__head { margin-bottom: 40px; }
  .section__head--row { flex-direction: column; align-items: flex-start; }
  .section__note { text-align: left; }
  .services { grid-template-columns: 1fr; }
  .service { padding: 28px 24px; }
  .service__icon { top: 24px; right: 24px; }
  .project__row { grid-template-columns: 1fr 28px; gap: 12px; padding: 22px 0; }
  .project__no, .project__year { display: none; }
  .project__name { font-size: 19px; }
  .project__body { grid-template-columns: 1fr; gap: 24px; padding: 22px; margin: 0 0 22px; }
  .stack__groups { grid-template-columns: 1fr; }
  .stack__group, .stack__group + .stack__group { padding: 24px 0 8px; border-left: 0; }
  .stack__group + .stack__group { border-top: 1px solid var(--line); }
  .process { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}