:root {
  --bg: #1A1A1A;
  --panel: #232323;
  --text: #EDEDED;
  --accent: #FF6B00;
  --line: #3A3A3A;
  --max: 920px;
}

* { box-sizing: border-box; }

html { font-display: swap; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Sans KR', sans-serif;
  font-weight: 400;
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

a { color: var(--accent); }

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

.section-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 48px 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 20;
}

.header-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.wordmark {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.hamburger {
  background: none;
  border: 1px solid var(--line);
  display: none;
  cursor: pointer;
  padding: 6px;
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 400;
  font-size: 0.9rem;
}

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

@media (max-width: 720px) {
  .hamburger { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding-top: 10px;
  }
  .main-nav ul li {
    border-top: 1px solid var(--line);
  }
  .main-nav ul li a {
    display: block;
    padding: 12px 4px;
  }
  .main-nav.is-open { display: block; }
}

/* Hero: full-bleed dark with grid pattern overlay */
.hero {
  background-color: #151515;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  padding: 80px 20px;
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  max-width: var(--max);
  margin-inline: auto;
}

.hero-tag {
  font-family: 'IBM Plex Mono', monospace;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin: 0 0 20px;
}

.hero-lead {
  margin: 0 0 30px;
  font-size: 1.02rem;
  color: #C4C4C4;
  max-width: 680px;
}

/* CTA buttons - angular */
.cta {
  display: inline-block;
  text-decoration: none;
  border: 2px solid var(--accent);
  color: var(--accent);
  background: transparent;
  border-radius: 0;
  padding: 13px 28px;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.cta:hover {
  background: var(--accent);
  color: #1A1A1A;
}

.cta--alt {
  border-color: var(--text);
  color: var(--text);
}

.cta--alt:hover {
  background: var(--accent);
  color: #1A1A1A;
  border-color: var(--accent);
}

/* Section numbering */
.content-section { border-top: 1px solid var(--line); }

.content-section--panel {
  background: var(--panel);
}

.section-num {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 700;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  border: 1px solid var(--accent);
  padding: 4px 10px;
}

.content-section h2 {
  font-size: 1.3rem;
  margin: 0 0 18px;
}

/* Table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 0.92rem;
}

.spec-table th, .spec-table td {
  border: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
}

.spec-table thead th {
  background: #2C2C2C;
  color: var(--accent);
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 500;
}

/* Branch / callout boxes */
.branch-box {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.branch-item {
  border: 1px solid var(--line);
  padding: 20px 22px;
  background: var(--panel);
}

.branch-item__label {
  font-size: 0.8rem;
  color: var(--accent);
  margin: 0 0 8px;
  letter-spacing: 0.1em;
}

.branch-item__title {
  font-family: 'IBM Plex Sans KR', sans-serif;
  font-weight: 500;
  font-size: 1.05rem;
  margin: 0 0 8px;
  color: var(--text);
}

.branch-item p:last-child { margin: 0; color: #C4C4C4; }

/* Checklist */
.checklist {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
}

.checklist li {
  padding-left: 30px;
  position: relative;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--accent);
}

/* FAQ */
.faq-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.faq-list details {
  border: 1px solid var(--line);
  padding: 14px 18px;
  background: var(--panel);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--accent);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.95rem;
}

.faq-list p {
  margin: 12px 0 0;
  color: #C4C4C4;
}

/* Images */
.shot {
  margin-inline: auto;
  max-width: 900px;
  padding: 0 20px;
}

.shot img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.shot figcaption {
  font-size: 0.88rem;
  color: #888;
  margin-top: 10px;
  text-align: center;
  font-family: 'IBM Plex Mono', monospace;
}

/* CTA block (bottom) */
.cta-block {
  background: #151515;
  border-top: 1px solid var(--line);
}

.cta-heading {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.3rem;
  margin: 0 0 14px;
  color: var(--text);
}

.cta-block p { color: #C4C4C4; }

/* Related links */
.related-heading {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.2rem;
  margin: 0 0 16px;
}

.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.related-list a {
  display: block;
  border: 1px solid var(--line);
  padding: 14px 18px;
  text-decoration: none;
  color: var(--text);
  font-weight: 400;
}

.related-list a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Footer */
footer {
  background: #101010;
  color: #B0B0B0;
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

footer address {
  font-style: normal;
  line-height: 1.8;
}

footer small {
  display: block;
  margin-top: 16px;
  opacity: 0.7;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}