@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+KR:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #14161c;
  --bg-surface: #191c23;
  --bg-surface-2: #20242c;
  --border: #33394a;
  --border-soft: #262b36;
  --text: #f2f3f5;
  --text-muted: #a9b0bb;
  --text-dim: #767e8c;
  --accent: #59c1f2;
  --accent-hover: #82d2f7;
  --accent-soft: rgba(89, 193, 242, 0.13);
  --on-accent: #0d1117;
  --sans: 'IBM Plex Sans KR', 'Pretendard', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;
  --pad: 120px;
  --container-max: 1200px;
}

@media (max-width: 1180px) {
  :root { --pad: 64px; }
}
@media (max-width: 720px) {
  :root { --pad: 24px; }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

img, svg { display: block; max-width: 100%; }

h1, h2, h3, p { margin: 0; }

/* ---------- layout helpers ---------- */
.section { padding: 100px var(--pad); }
.section--tight { padding: 44px var(--pad); }
.section--hero { padding: 120px var(--pad) 100px; }
.section-eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
}
.section-header { display: flex; flex-direction: column; gap: 16px; max-width: 620px; margin-bottom: 48px; }
.section-title { font-size: 34px; font-weight: 700; letter-spacing: -0.01em; }
.section-desc { font-size: 16px; line-height: 1.7; color: var(--text-muted); }
.border-top { border-top: 1px solid var(--border-soft); }
.border-bottom { border-bottom: 1px solid var(--border-soft); }
.bg-surface { background: var(--bg-surface); }

@media (max-width: 720px) {
  .section { padding: 64px var(--pad); }
  .section--hero { padding: 56px var(--pad) 48px; }
  .section-title { font-size: 26px; }
}

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--border-soft);
  background: rgba(20, 22, 28, 0.9);
  backdrop-filter: blur(12px);
}
.logo-link { display: flex; align-items: center; }
.logo-mark { height: 28px; width: auto; }
.logo-mark.logo-mark--sm { height: 22px; }

.nav-links { display: flex; align-items: center; gap: 48px; }
.nav-link { color: var(--text-muted); font-size: 15px; font-weight: 500; transition: color .15s; }
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); }
.lang-switch {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 9px;
}
.lang-switch:hover { border-color: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    /* .site-header uses backdrop-filter, which makes it the
       containing block for fixed-position descendants -- so `bottom:
       0` here would resolve against the header's own 84px box, not
       the viewport. Use an explicit viewport-relative height instead. */
    position: fixed;
    top: 84px;
    left: 0;
    right: 0;
    height: calc(100vh - 84px);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-soft);
    padding: 12px var(--pad) 20px;
    display: none;
    overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-link { padding: 12px 0; width: 100%; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .15s, border-color .15s, color .15s;
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- hero ---------- */
.hero { display: flex; align-items: center; gap: 64px; }
.hero-content { flex: 1 1 560px; display: flex; flex-direction: column; gap: 28px; }
.hero-eyebrow { display: flex; align-items: center; gap: 8px; }
.hero-eyebrow-dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }
.hero-title { font-size: 52px; line-height: 1.28; font-weight: 700; letter-spacing: -0.01em; }
.hero-desc { font-size: 17px; line-height: 1.75; color: var(--text-muted); max-width: 480px; }
.hero-actions { display: flex; gap: 16px; padding-top: 8px; flex-wrap: wrap; }
.hero-art { flex: 1 1 480px; display: flex; justify-content: center; }

@media (max-width: 1024px) {
  .hero { flex-direction: column; align-items: flex-start; gap: 40px; }
  .hero-content, .hero-art { flex: none; width: 100%; }
  .hero-art { align-self: center; }
}
@media (max-width: 720px) {
  .hero-title { font-size: 34px; }
  .hero-desc { font-size: 15.5px; }
  .hero-art svg { width: 280px; height: auto; }
}

/* ---------- page hero (subpages) ---------- */
.page-hero { display: flex; flex-direction: column; gap: 20px; max-width: 640px; }
.page-hero h1 { font-size: 44px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; }
@media (max-width: 720px) {
  .page-hero h1 { font-size: 30px; }
}

/* ---------- trust bar ---------- */
.trust-bar { display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.trust-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--text-dim); text-transform: uppercase; white-space: nowrap; }
.trust-list { display: flex; align-items: center; gap: 56px; flex-wrap: wrap; }
.trust-item { font-size: 17px; font-weight: 600; color: var(--text-muted); }

/* ---------- cert badges preview (home) ---------- */
.cert-badges { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.cert-badge { font-size: 13px; font-weight: 600; color: var(--text-muted); background: var(--bg-surface); border: 1px solid var(--border-soft); border-radius: 999px; padding: 6px 14px; white-space: nowrap; }
.cert-badges-more { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; color: var(--accent); white-space: nowrap; }
@media (min-width: 900px) { .cert-badges-more { margin-left: auto; } }
.cert-badges-more:hover { text-decoration: underline; }

/* ---------- solution / product cards ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

.card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  transition: border-color .15s;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow: hidden;
}
.card:hover { border-color: var(--border); }
.card-diagram {
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 128px;
  height: auto;
  z-index: -1;
  pointer-events: none;
}
.area-diagram {
  position: absolute;
  right: -12px;
  bottom: -10px;
  width: 150px;
  height: auto;
  z-index: -1;
  pointer-events: none;
  opacity: 0.9;
}
@media (max-width: 900px) {
  .area-diagram { display: none; }
}
.card-top { display: flex; align-items: center; justify-content: space-between; }
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-badge {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-transform: uppercase;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  padding: 4px 8px;
}
.card-title { font-size: 19px; font-weight: 600; }
.card-desc { font-size: 14.5px; line-height: 1.7; color: var(--text-muted); flex: 1; }
.card-link { font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }

.pill-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 5px 12px;
  border-radius: 4px;
  background: var(--accent-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}

/* ---------- business area rows ---------- */
.area-row { display: flex; gap: 64px; padding: 56px 0; border-bottom: 1px solid var(--border-soft); align-items: flex-start; }
.area-row:last-child { border-bottom: none; }
.area-main { position: relative; flex: 0 0 400px; display: flex; flex-direction: column; gap: 18px; }
.area-index { font-family: var(--mono); font-size: 13px; color: var(--text-dim); }
.area-title { font-size: 24px; font-weight: 700; letter-spacing: -0.01em; }
.area-desc { font-size: 15px; line-height: 1.75; color: var(--text-muted); }
.area-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.area-tags { flex: 1; display: flex; flex-wrap: wrap; gap: 12px; align-content: flex-start; padding-top: 6px; }

/* ---------- topic steps (process-stage breakdown) ---------- */
.topic-steps { flex: 1; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.topic-step { position: relative; display: flex; flex-direction: column; gap: 10px; padding: 20px 18px 18px; background: var(--bg-surface-2); border: 1px solid var(--border-soft); border-radius: 6px; }
.topic-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -16px;
  width: 8px;
  height: 8px;
  border-top: 1.5px solid var(--text-dim);
  border-right: 1.5px solid var(--text-dim);
  transform: translateY(-50%) rotate(45deg);
}
.topic-step-num { font-family: var(--mono); font-size: 12px; font-weight: 600; color: var(--on-accent); background: var(--accent); width: 22px; height: 22px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.topic-step-title { font-size: 14.5px; font-weight: 600; color: var(--text); }
.topic-step-desc { font-size: 12.5px; line-height: 1.6; color: var(--text-muted); }
@media (max-width: 1180px) {
  .topic-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .topic-step:not(:last-child)::after { display: none; }
}
@media (max-width: 900px) {
  .topic-steps { grid-template-columns: 1fr; }
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 4px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-soft);
  font-size: 13.5px;
  color: var(--text-muted);
  font-family: var(--mono);
}
@media (max-width: 900px) {
  .area-row { flex-direction: column; gap: 24px; }
  .area-main { flex: 1 1 auto; }
}

/* ---------- client cases ---------- */
.client-card {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.client-label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase; }
.client-name { font-size: 20px; font-weight: 700; }
.client-projects { display: flex; flex-direction: column; gap: 8px; font-size: 14px; line-height: 1.7; color: var(--text-muted); }

/* ---------- value cards (about) ---------- */
.value-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.value-index { font-family: var(--mono); font-size: 12px; color: var(--accent); }
.value-title { font-size: 15.5px; font-weight: 600; line-height: 1.4; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 540px) { .grid-4 { grid-template-columns: 1fr; } }

/* ---------- certifications (about) ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.cert-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.cert-thumb {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top center;
  background: #fff;
  border-bottom: 1px solid var(--border-soft);
}
.cert-card-body { padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; }
.cert-title { font-size: 15.5px; font-weight: 600; line-height: 1.4; }
.cert-download { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; color: var(--accent); }
.cert-download:hover { text-decoration: underline; }

/* ---------- timeline (about) ---------- */
.timeline { display: flex; flex-direction: column; }
.tl-row { display: flex; gap: 40px; padding: 28px 0; border-bottom: 1px solid var(--border-soft); }
.tl-row:last-child { border-bottom: none; }
.tl-year { flex: 0 0 110px; font-family: var(--mono); font-size: 25px; font-weight: 600; color: var(--text-dim); }
.tl-row.recent .tl-year { color: var(--accent); }
.tl-items { flex: 1; display: flex; flex-direction: column; gap: 10px; }
.tl-item { font-size: 15px; color: var(--text-muted); line-height: 1.6; }
@media (max-width: 640px) {
  .tl-row { flex-direction: column; gap: 8px; }
}

/* ---------- history teaser (home) ---------- */
.history-teaser-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 48px; gap: 24px; flex-wrap: wrap; }
.history-item { border-left: 2px solid var(--border); padding-left: 20px; display: flex; flex-direction: column; gap: 8px; }
.history-item.recent { border-left-color: var(--accent); }
.history-year { font-family: var(--mono); font-size: 22px; font-weight: 600; color: var(--text-dim); }
.history-item.recent .history-year { color: var(--accent); }
.history-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

/* ---------- cta band ---------- */
.cta-band { padding: 90px var(--pad); text-align: center; }
.cta-inner { max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 24px; }
.cta-title { font-size: 30px; font-weight: 700; letter-spacing: -0.01em; }
@media (max-width: 720px) {
  .cta-title { font-size: 22px; }
}

/* ---------- contact ---------- */
.contact-layout { display: flex; gap: 48px; }
.contact-card {
  flex: 0 0 460px;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 44px;
}
.info-row { display: flex; flex-direction: column; gap: 6px; padding: 22px 0; border-bottom: 1px solid var(--border-soft); }
.info-row:last-child { border-bottom: none; }
.info-label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; color: var(--text-dim); text-transform: uppercase; }
.info-value { font-size: 17px; color: var(--text); line-height: 1.6; }
.map-panel {
  flex: 1;
  position: relative;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  overflow: hidden;
  min-height: 340px;
}
.map-embed {
  width: 100%;
  height: 100%;
  min-height: 340px;
  border: 0;
  display: block;
}
@media (max-width: 900px) {
  .contact-layout { flex-direction: column; }
  .contact-card { flex: 1 1 auto; }
}

/* ---------- footer ---------- */
.site-footer { padding: 72px var(--pad) 40px; border-top: 1px solid var(--border-soft); }
.footer-top { display: flex; justify-content: space-between; gap: 60px; padding-bottom: 48px; border-bottom: 1px solid var(--border-soft); flex-wrap: wrap; }
.footer-brand { display: flex; flex-direction: column; gap: 14px; max-width: 420px; }
.footer-brand-row { display: flex; align-items: center; gap: 10px; }
.footer-address { font-size: 14px; line-height: 1.7; color: var(--text-dim); }
.footer-cols { display: flex; gap: 80px; flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col-label { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--text-dim); text-transform: uppercase; }
.footer-col .nav-link { font-size: 14px; }
.footer-contact-line { font-size: 14px; color: var(--text-muted); }
.footer-bottom {
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
}
.footer-legal { font-size: 13px; color: var(--text-dim); font-family: var(--mono); line-height: 1.7; }
.footer-policy-links { display: flex; gap: 20px; }
.footer-policy-links a { font-size: 13px; color: var(--text-dim); font-family: var(--mono); }
.footer-policy-links a:hover { color: var(--text-muted); }

@media (max-width: 720px) {
  .footer-top { flex-direction: column; gap: 32px; }
}