:root {
  --bg: #ffffff;
  --surface: #f6f6fb;
  --surface-2: #eeeef6;
  --border: rgba(0,0,0,0.09);
  --border-soft: rgba(0,0,0,0.05);
  --rule: rgba(0,0,0,0.22);
  --accent: #5200FF;
  --accent-soft: rgba(82,0,255,0.10);
  --text: #1a1a1a;
  --text-muted: #5a5a5a;
  --text-dim: #757575;
  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --max: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* Shared portfolio navigation */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 48px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.logo {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.03em;
  color: var(--text);
  transition: color 0.2s ease;
}
.logo:hover { color: var(--accent); }
.nav-links { display: flex; gap: 36px; align-items: center; }
.nav-link {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-muted);
  position: relative;
  padding-bottom: 3px;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-cta {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 9px 18px;
  border-radius: 3px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav-cta:hover { background: var(--accent); color: #ffffff; border-color: var(--accent); }

/* Case-study page shell */
.cs-wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 142px 48px 96px;
}
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 56px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.cs-back:hover { color: var(--accent); border-color: var(--accent); }

.cs-eyebrow {
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.cs-title {
  font-family: var(--font-display);
  font-size: clamp(70px, 11vw, 126px);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: 0.01em;
  color: var(--text);
  margin-bottom: 26px;
}
.cs-lede {
  max-width: 760px;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 34px;
}

.cs-callout {
  position: relative;
  margin: 38px 0 10px;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
}
.cs-callout strong { color: var(--text); font-weight: 700; }
.cs p a {
  color: var(--accent);
  font-weight: 650;
  border-bottom: 1px solid rgba(82,0,255,0.28);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.cs p a:hover {
  color: var(--text);
  border-color: var(--accent);
}

.cs-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.cs-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 16px;
  border-radius: 4px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  line-height: 1;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.cs-button:hover {
  background: #3f00c9;
  border-color: #3f00c9;
  transform: translateY(-1px);
}
.cs-button.secondary {
  background: #ffffff;
  color: var(--text);
  border-color: var(--rule);
}
.cs-button.secondary:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--surface);
}
.cs-status {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 10px 14px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.cs h2 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 56px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 72px 0 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border-soft);
}
.cs h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 34px 0 10px;
  letter-spacing: -0.01em;
}
.cs p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 18px;
}
.cs strong { color: var(--text); font-weight: 700; }
.cs em { color: inherit; }
.cs code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2px 5px;
  border-radius: 4px;
}

.cs ul {
  list-style: none;
  margin: 8px 0 28px;
  padding: 0;
}
.cs li {
  position: relative;
  padding: 0 0 0 24px;
  margin-bottom: 13px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-muted);
}
.cs li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}
.cs li strong { color: var(--text); }

.cs table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 22px 0 12px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}
.cs th, .cs td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
.cs tr:last-child td { border-bottom: 0; }
.cs th {
  background: var(--surface);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.cs td { color: var(--text-muted); }
.cs td:first-child { color: var(--text); font-weight: 650; width: 28%; }

.cs-cap {
  margin: 32px 0 12px;
  font-size: 11px !important;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent) !important;
}

/* Architecture diagrams */
.arch {
  margin: 18px 0 28px;
  padding: 28px;
  background: linear-gradient(180deg, var(--surface) 0%, #fff 100%);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.arch-tier {
  width: 100%;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.arch-node {
  flex: 1 1 0;
  min-width: 150px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.035);
}
.arch-node.accent {
  border-color: rgba(82,0,255,0.35);
  box-shadow: inset 0 3px 0 var(--accent), 0 8px 24px rgba(82,0,255,0.06);
}
.arch-node b {
  display: block;
  font-size: 14px;
  font-weight: 750;
  color: var(--text);
  margin-bottom: 2px;
}
.arch-node span {
  display: block;
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.arch-arrow {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 0;
  color: var(--text-dim);
}
.arch-arrow::before {
  content: '↓';
  color: var(--accent);
  font-weight: 800;
}
.arch-arrow span {
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.arch-side {
  width: 100%;
  margin-top: 14px;
  padding: 10px 13px;
  background: var(--accent-soft);
  border: 1px solid rgba(82,0,255,0.13);
  border-radius: 5px;
  text-align: center;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.arch-side b { color: var(--accent); }

.arch-vpc {
  width: 100%;
  border: 1px dashed rgba(82,0,255,0.35);
  border-radius: 9px;
  padding: 14px;
  margin: 4px 0;
}
.arch-vpc-label,
.arch-zone-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  text-align: center;
}
.arch-vpc-label { color: var(--accent); margin-bottom: 10px; }
.arch-zone {
  border: 1px dashed var(--rule);
  border-radius: 7px;
  padding: 11px;
  margin: 8px 0;
}
.arch-zone-label { color: var(--text-dim); margin-bottom: 8px; }

/* Page footer */
.cs-foot {
  margin-top: 64px;
  padding: 28px 0 0;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.75;
}
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 38px 48px 46px;
}
.site-footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.footer-mark {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a {
  font-size: 12px;
  color: var(--text-dim);
  transition: color 0.2s ease;
}
.footer-links a:hover { color: var(--accent); }

@media (max-width: 800px) {
  .nav { padding: 16px 22px; }
  .nav-links { display: none; }
  .nav-cta { padding: 8px 13px; }
  .cs-wrap { padding: 120px 22px 72px; }
  .cs-back { margin-bottom: 42px; }
  .cs-title { font-size: clamp(60px, 19vw, 92px); }
  .cs-callout { padding: 20px; }
  .cs-actions { flex-direction: column; }
  .cs-button, .cs-status { width: 100%; }
  .arch { padding: 18px; }
  .arch-tier { flex-direction: column; }
  .arch-node { min-width: 0; width: 100%; }
  .cs table { font-size: 13px; display: block; overflow-x: auto; }
  .site-footer { padding: 34px 22px 42px; }
}