/* sentra deep-dive — Doctrine v6 · Dark theme #0f1419 bg · threat red #ff4444 + cyan #00d4ff */
/* Mirrors szl-anatomy quality bar */

:root {
  --bg:           #0f1419;
  --surface:      #141b22;
  --surface-alt:  #1a222c;
  --border:       #1e2d3d;
  --text:         #f0f4f8;
  --text-muted:   #8aa0b8;
  --text-faint:   #5a7090;
  --red:          #ff4444;
  --red-dim:      rgba(255, 68, 68, 0.12);
  --red-glow:     rgba(255, 68, 68, 0.25);
  --cyan:         #00d4ff;
  --cyan-dim:     rgba(0, 212, 255, 0.10);
  --cyan-glow:    rgba(0, 212, 255, 0.22);
  --green:        #22c55e;
  --gradient:     linear-gradient(135deg, #ff4444 0%, #00d4ff 100%);
  --radius:       12px;
  --radius-sm:    8px;
  --transition:   200ms ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Noise overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ── Skip link ── */
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: 1rem;
  z-index: 9999;
  padding: 0.5rem 1.25rem;
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: 4px;
  text-decoration: none;
  border: 2px solid var(--cyan);
}
.skip-to-content:focus { left: 1rem; }

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  background: rgba(15, 20, 25, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 12px 0;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.nav-brand {
  font-size: 14px;
  font-weight: 700;
  color: var(--red);
  text-decoration: none;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text); background: var(--surface); }

/* ── Hero ── */
.hero {
  padding: 100px 0 72px;
  text-align: center;
  position: relative;
}

.hero-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 55% at 50% 0%, rgba(255,68,68,0.07) 0%, transparent 65%),
              radial-gradient(ellipse 40% 30% at 80% 60%, rgba(0,212,255,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--red-dim);
  border: 1px solid var(--red-glow);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--red);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--red);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.6); }
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.8rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 20px;
}

.hero h1 .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 auto 40px;
  line-height: 1.75;
}

.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 56px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  background: var(--gradient);
  color: #0f1419;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), transform 0.2s;
}
.btn-secondary:hover { color: var(--text); border-color: var(--cyan); transform: translateY(-1px); }

.hero-image-wrap {
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 0 80px rgba(255,68,68,0.07), 0 24px 64px rgba(0,0,0,0.6);
}
.hero-image-wrap img { width: 100%; height: auto; display: block; }

/* ── Sections ── */
section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
  position: relative;
}

section h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 10px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 720px;
  line-height: 1.75;
  margin-bottom: 40px;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.card p, .card li {
  font-size: 14px;
  color: var(--text);
  line-height: 1.75;
}

.card ul { list-style: none; padding: 0; }
.card ul li { padding-left: 14px; position: relative; margin-bottom: 4px; }
.card ul li::before { content: '·'; position: absolute; left: 0; color: var(--red); }

/* ── What sentra is — 3 col grid ── */
.what-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.what-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  overflow: hidden;
}
.what-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
}

.what-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 10px;
}

.what-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

.stat-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  color: var(--text-muted);
}
.stat-chip strong { color: var(--text); }

/* ── Gates table ── */
.gates-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 32px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead tr {
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}

thead th {
  padding: 12px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--surface); }

tbody td {
  padding: 14px 16px;
  color: var(--text);
  vertical-align: top;
  line-height: 1.6;
}

.gate-id {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--red);
  white-space: nowrap;
}

.gate-name { font-weight: 600; color: var(--text); }
.gate-source {
  font-size: 12px;
  color: var(--text-faint);
}
.gate-source a {
  color: var(--cyan);
  text-decoration: none;
}
.gate-source a:hover { text-decoration: underline; }

.badge-szl {
  display: inline-block;
  padding: 2px 8px;
  background: var(--cyan-dim);
  border: 1px solid var(--cyan-glow);
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ── Architecture ── */
.arch-wrap {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 32px;
  background: var(--surface);
}
.arch-wrap svg { width: 100%; height: auto; display: block; }

.chart-wrap {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 24px;
  background: var(--surface);
}
.chart-wrap img { width: 100%; height: auto; display: block; }
.chart-caption {
  font-size: 12px;
  color: var(--text-faint);
  text-align: center;
  padding: 10px 16px;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  font-style: italic;
}

/* ── Live demo iframe ── */
.demo-section .iframe-wrap {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 16px;
  background: var(--surface);
  box-shadow: 0 0 40px rgba(255,68,68,0.05);
}

.iframe-wrap iframe {
  width: 100%;
  border: none;
  display: block;
  min-height: 650px;
}

.iframe-caption {
  font-size: 12px;
  color: var(--text-faint);
  text-align: center;
  padding: 10px 16px;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  font-style: italic;
}

/* ── Comparison table ── */
.comparison-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 32px;
}

.comparison-wrap table thead th:first-child { min-width: 200px; }

.yn-yes {
  color: var(--green);
  font-weight: 700;
  font-size: 13px;
}
.yn-no {
  color: var(--red);
  font-weight: 700;
  font-size: 13px;
}
.yn-partial {
  color: #f59e0b;
  font-weight: 600;
  font-size: 13px;
}
.vendor-sentra { color: var(--cyan); font-weight: 700; }

/* ── What sentra is NOT ── */
.not-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.not-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  border-left: 3px solid var(--red);
}

.not-card h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.not-card h3::before {
  content: '✕';
  font-size: 11px;
}

.not-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── Citations ── */
.citations-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.citation-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.citation-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: var(--red);
  min-width: 28px;
  padding-top: 2px;
}

.citation-body { flex: 1; }
.citation-body strong { color: var(--text); font-size: 14px; display: block; margin-bottom: 4px; }
.citation-body span { font-size: 12px; color: var(--text-faint); display: block; margin-bottom: 6px; }
.citation-body a {
  font-size: 12px;
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}
.citation-body a:hover { text-decoration: underline; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  background: var(--surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 14px;
}

.footer-col ul { list-style: none; padding: 0; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--cyan); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-faint);
}

.footer-doctrine {
  font-size: 11px;
  color: var(--text-faint);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero { padding: 80px 0 56px; }
  .hero h1 { font-size: 2.2rem; }
  .what-grid, .not-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  section { padding: 56px 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 3px;
}