/* =============================================
   SUKHUMVIT 21 — SOI 21 / ASOK
   s21.css — Dark editorial stylesheet
   ============================================= */

:root {
  --black:   #0a0a0a;
  --offblack: #111111;
  --card:    #161616;
  --border:  #222222;
  --cyan:    #00d4ff;
  --white:   #f0f0f0;
  --muted:   #888888;
  --label:   #555555;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: 'Helvetica Neue', Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-serif);
  line-height: 1.7;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── NETWORK NAV ─────────────────────────────── */
.network-nav {
  background: var(--offblack);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.network-hub {
  color: var(--cyan);
  font-weight: 700;
}

.nav-divider {
  color: var(--label);
}

.network-nav a { color: var(--muted); }
.network-nav a:hover { color: var(--white); text-decoration: none; }
.nav-active { color: var(--white) !important; font-weight: 600; }

/* ── MASTHEAD ────────────────────────────────── */
.masthead {
  background: var(--offblack);
  border-bottom: 2px solid var(--cyan);
  padding: 64px 24px 48px;
  text-align: center;
}

.masthead-inner {
  max-width: 700px;
  margin: 0 auto;
}

.soi-label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}

.soi-title {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 0.9;
  color: var(--white);
  margin-bottom: 20px;
}

.soi-sub {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 32px;
  font-style: italic;
}

/* ── SVG MAP BADGE ───────────────────────────── */
.map-badge {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px;
  background: var(--card);
}

.soi-map-svg {
  width: 260px;
  height: 104px;
  display: block;
}

/* ── QUICK FACTS ─────────────────────────────── */
.quick-facts {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.fact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border-left: 2px solid var(--cyan);
}

.fact-label {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.fact-value {
  font-size: 0.92rem;
  color: var(--white);
}

/* ── MAIN CONTENT ────────────────────────────── */
.main-content {
  padding: 60px 0;
}

.content-section {
  margin-bottom: 52px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--white);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.body-text {
  color: #c8c8c8;
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

/* ── TWO COLUMN ──────────────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 52px;
}

@media (max-width: 680px) {
  .two-col { grid-template-columns: 1fr; gap: 0; }
}

/* ── NETWORK SECTION ─────────────────────────── */
.network-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  padding: 32px;
  border-radius: 2px;
}

.network-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.network-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--offblack);
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: border-color 0.2s;
  color: inherit;
}

.network-link:hover {
  border-color: var(--cyan);
  text-decoration: none;
}

.nl-name {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 700;
}

.nl-desc {
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── FOOTER ──────────────────────────────────── */
.site-footer {
  background: var(--offblack);
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
}

.footer-network {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--label);
  font-family: var(--font-sans);
}

.footer-copy a,
.footer-network a {
  color: var(--cyan);
}

/* ── RESPONSIVE ──────────────────────────────── */
@media (max-width: 600px) {
  .masthead { padding: 40px 16px 32px; }
  .soi-title { font-size: 3.5rem; }
  .container { padding: 0 16px; }
  .network-links { grid-template-columns: 1fr; }
  .fact-grid { grid-template-columns: 1fr 1fr; }
}