/* CounterAudit developer platform — Countersig / ProvenanceAI–grade technical marketing */

:root {
  --bg-0: #06080d;
  --bg-1: #0a0f1a;
  --bg-2: #111827;
  --surface: rgba(15, 23, 42, 0.75);
  --surface-border: rgba(148, 163, 184, 0.12);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --dim: #64748b;
  --accent: #06b6d4;
  --accent-bright: #22d3ee;
  --accent-soft: rgba(6, 182, 212, 0.12);
  --violet: #8b5cf6;
  --violet-soft: rgba(139, 92, 246, 0.12);
  --max: 1140px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", monospace;
  --display: "Space Grotesk", "Inter", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: radial-gradient(ellipse 100% 80% at 15% -20%, rgba(6, 182, 212, 0.12), transparent 50%),
    radial-gradient(ellipse 80% 60% at 95% 10%, rgba(139, 92, 246, 0.08), transparent 45%),
    linear-gradient(170deg, var(--bg-0) 0%, var(--bg-1) 45%, #0c1220 100%);
  background-attachment: fixed;
}

::selection {
  background: rgba(6, 182, 212, 0.28);
  color: var(--text);
}

a {
  color: var(--accent-bright);
  text-decoration: none;
}
a:hover {
  color: #67e8f9;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2rem);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(100, 116, 139, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(100, 116, 139, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 65% at 40% 15%, black 25%, transparent 70%);
}

.content {
  position: relative;
  z-index: 1;
}

header {
  border-bottom: 1px solid var(--surface-border);
  background: rgba(6, 8, 13, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.05rem 0;
  gap: 1.25rem;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  color: var(--text);
}
.wordmark .tld {
  color: var(--accent-bright);
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 1.15rem;
}
nav a {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}
nav a:hover {
  color: var(--text);
}
nav .btn-nav {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.45rem 0.95rem;
  border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.25);
}
nav .btn-nav:hover {
  opacity: 0.92;
  color: #fff !important;
}

.hero {
  padding: clamp(3rem, 8vw, 5rem) 0 clamp(2rem, 4vw, 3rem);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-bright);
  margin-bottom: 1rem;
}
.kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

h1 {
  font-family: var(--display);
  font-size: clamp(2.1rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin: 0 0 1.1rem;
  max-width: 17ch;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 2rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--dim);
}
.hero-meta span {
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--surface-border);
  background: rgba(6, 182, 212, 0.04);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.68rem 1.3rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
  color: #042f2e;
  box-shadow: 0 4px 28px rgba(6, 182, 212, 0.28);
  font-family: var(--font);
}
.btn-primary:hover {
  transform: translateY(-1px);
  text-decoration: none;
  color: #022c22;
}

.btn-secondary {
  background: transparent;
  border-color: var(--surface-border);
  color: var(--text);
}
.btn-secondary:hover {
  border-color: rgba(6, 182, 212, 0.35);
  text-decoration: none;
}

.section-title {
  font-family: var(--display);
  font-size: clamp(1.45rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
}
.section-lead {
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 1.75rem;
}

.panels {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  padding: 2rem 0 3rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 14px;
  padding: 1.45rem 1.35rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.panel:hover {
  border-color: rgba(6, 182, 212, 0.22);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
}

.panel h2 {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-bright);
  margin: 0 0 0.65rem;
  letter-spacing: -0.02em;
}

.panel p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--muted);
  line-height: 1.55;
}

.code-wrap {
  margin-top: 1rem;
  border-radius: 12px;
  border: 1px solid var(--surface-border);
  background: rgba(0, 0, 0, 0.35);
  overflow: hidden;
}
.code-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--surface-border);
  background: rgba(6, 182, 212, 0.05);
}
.code-header .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
}
pre {
  margin: 0;
  padding: 1rem 1.15rem 1.15rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: #cbd5e1;
  overflow-x: auto;
}
pre .k {
  color: var(--violet);
}
pre .s {
  color: var(--accent-bright);
}
pre .n {
  color: #fcd34d;
}

.trilogy {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--surface-border);
  border-bottom: 1px solid var(--surface-border);
}
.trilogy article {
  padding: 1rem 0;
}
.trilogy h3 {
  font-size: 0.95rem;
  margin: 0 0 0.4rem;
  color: var(--text);
}
.trilogy p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--dim);
  line-height: 1.5;
}

.sdk-band {
  padding: 2.75rem 0;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.06), transparent);
  border-bottom: 1px solid var(--surface-border);
}
.sdk-band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
.sdk-band p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 32rem;
}
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.pill {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--surface-border);
  color: var(--muted);
  background: var(--violet-soft);
}

footer {
  padding: 2.5rem 0 2rem;
  color: var(--dim);
  font-size: 0.8125rem;
}
.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-bottom: 2rem;
}
.footer-grid strong {
  display: block;
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.6rem;
  font-family: var(--mono);
}
.footer-grid a {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--dim);
}
.footer-grid a:hover {
  color: var(--text);
}
.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--surface-border);
}

@media (max-width: 640px) {
  nav a:not(.btn-nav) {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn-primary:hover {
    transform: none;
  }
}