/* ==========================================================================
   84ttyy — minimal tech, dark
   ========================================================================== */

:root {
  color-scheme: dark;

  --bg: #0b0d12;
  --surface: #11141b;
  --surface-2: #151922;
  --fg: #e7eaf0;
  --muted: #868fa1;
  --dim: #5d6675;
  --line: #1d222c;
  --line-strong: #2a313d;
  --accent: #c9f558;
  --accent-dim: rgba(201, 245, 88, 0.14);

  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Menlo, monospace;
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Segoe UI", Roboto, sans-serif;

  --w: 60rem;
  --pad: 1.5rem;
}

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

/* Language toggle ------------------------------------------------------------
   <html data-lang="ko|en"> 기준으로 반대 언어 요소를 숨긴다.
   JS가 없으면 기본값(ko)이 그대로 적용된다. */

html[data-lang="ko"] body [lang="en"] { display: none; }
html[data-lang="en"] body [lang="ko"] { display: none; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  font-feature-settings: "ss01";
  word-break: keep-all;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}

/* Background grid + glow ---------------------------------------------------- */

.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(48rem 26rem at 50% -8%, rgba(201, 245, 88, 0.08), transparent 62%),
    radial-gradient(40rem 24rem at 88% 4%, rgba(94, 221, 245, 0.05), transparent 60%),
    repeating-linear-gradient(to right, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 5.5rem),
    repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 5.5rem);
}

/* Layout -------------------------------------------------------------------- */

.inner {
  width: 100%;
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* Header -------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 13, 18, 0.88);
  backdrop-filter: saturate(140%) blur(16px);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 4rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--fg);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.wordmark::before {
  content: "";
  width: 0.625rem;
  height: 0.625rem;
  background: var(--accent);
  border-radius: 2px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav a:hover { color: var(--fg); }

.lang-switch {
  display: flex;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  overflow: hidden;
}

.lang-switch button {
  padding: 0.3125rem 0.625rem;
  background: transparent;
  border: none;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.lang-switch button:hover { color: var(--fg); }

html[data-lang="ko"] .lang-switch [data-lang-btn="ko"],
html[data-lang="en"] .lang-switch [data-lang-btn="en"] {
  background: var(--accent-dim);
  color: var(--accent);
}

/* Hero ---------------------------------------------------------------------- */

.hero {
  padding: 6rem 0 5rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 1.75rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.035em;
}


/* Blocks -------------------------------------------------------------------- */

.block {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 2rem;
  padding: 4rem 0;
  border-bottom: 1px solid var(--line);
}

.block:last-of-type { border-bottom: none; }

.block-head { position: relative; }

.num {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.block-head h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.block-body > :first-child { margin-top: 0; }
.block-body > :last-child { margin-bottom: 0; }

/* Typography ---------------------------------------------------------------- */

p { margin: 0 0 0.875rem; }

ul { margin: 0 0 0.875rem; padding-left: 1.125rem; }

li { margin-bottom: 0.25rem; }

a {
  color: var(--accent);
  text-decoration-color: rgba(201, 245, 88, 0.4);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}

a:hover { text-decoration-color: var(--accent); }

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

/* Status card --------------------------------------------------------------- */

.card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.25rem 0.625rem;
  background: var(--accent-dim);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status .dot {
  width: 0.375rem;
  height: 0.375rem;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* Contact ------------------------------------------------------------------- */

.mail {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: clamp(1.125rem, 3.5vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 245, 88, 0.35);
  transition: border-color 0.15s ease;
}

.mail:hover { border-bottom-color: var(--accent); }

/* Footer -------------------------------------------------------------------- */

.site-footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--line);
}

.site-footer .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.site-footer nav a {
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-footer nav a:hover { color: var(--fg); }

.copyright {
  margin: 0;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.footer-org {
  flex-basis: 100%;
  margin-top: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.footer-org p {
  margin: 0;
  color: var(--dim);
  font-size: 0.75rem;
  line-height: 1.9;
}

.footer-org a {
  color: var(--dim);
  text-decoration-color: var(--line-strong);
}

.footer-org a:hover { color: var(--muted); }

/* Legal pages --------------------------------------------------------------- */

.page-head {
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.page-head h1 {
  margin: 0;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.page-head .meta {
  margin: 1.5rem 0 0;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.legal .block { padding: 2.75rem 0; }

.contact-lines {
  font-size: 0.9375rem;
  line-height: 1.9;
}

/* Responsive ---------------------------------------------------------------- */

@media (max-width: 48rem) {
  .block {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 3rem 0;
  }

  .hero { padding: 4rem 0 3.5rem; }

  .nav { display: none; }

  .site-footer .inner {
    flex-direction: column;
    align-items: flex-start;
  }
}
