/* Netvibra marketing site — self-contained, no external dependencies.
   Palette mirrors the product app: slate base, gap-red #b91c1c, cited-green #15803d. */

:root {
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --gap: #b91c1c;
  --cited: #15803d;
  --review: #b45309;
  --accent: #38bdf8;
  --radius: 12px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--slate-900);
  background: var(--slate-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.container.narrow {
  max-width: 820px;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: rgba(148, 163, 184, 0.2);
  padding: 0.1em 0.4em;
  border-radius: 6px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius);
  transition: transform 0.06s ease, background 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--accent);
  color: var(--slate-900);
}
.btn-primary:hover {
  background: #7dd3fc;
}
.btn-ghost {
  border-color: var(--slate-400);
  color: var(--slate-200);
}
.btn-ghost:hover {
  border-color: var(--slate-200);
  background: rgba(255, 255, 255, 0.06);
}
.section .btn-ghost {
  color: var(--slate-700);
  border-color: var(--slate-300);
}
.section .btn-ghost:hover {
  background: var(--slate-100);
}
.btn-lg {
  padding: 0.95rem 1.9rem;
  font-size: 1.05rem;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--slate-800);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}
.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: #fff;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  color: var(--slate-300);
  font-size: 0.95rem;
  font-weight: 500;
}
.nav-links a:hover {
  color: #fff;
}

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1200px 600px at 75% -10%, #1e3a5f 0%, var(--slate-900) 55%);
  color: #fff;
  padding: 88px 0 96px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  font-weight: 800;
  margin-bottom: 22px;
}
.hero .accent {
  color: var(--accent);
}
.lede {
  font-size: 1.15rem;
  color: var(--slate-300);
  max-width: 38ch;
  margin: 0 0 30px;
}
.lede strong {
  color: #fff;
}
.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.hero-badges {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 0;
  margin: 0;
}
.hero-badges li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9rem;
  color: var(--slate-300);
}
.hero-badges li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cited);
  box-shadow: 0 0 0 3px rgba(21, 128, 61, 0.25);
}

/* Hero panel mock */
.hero-panel {
  background: var(--slate-800);
  border: 1px solid var(--slate-700);
  border-radius: 16px;
  padding: 8px;
  box-shadow: 0 30px 60px -25px rgba(0, 0, 0, 0.6);
}
.panel-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 14px;
  align-items: center;
  padding: 13px 14px;
  border-radius: 10px;
  font-size: 0.82rem;
  color: var(--slate-200);
}
.panel-row + .panel-row {
  margin-top: 4px;
}
.panel-row b {
  color: #fff;
}
.panel-head {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.66rem;
  color: var(--slate-400);
  font-weight: 600;
}
.panel-row:not(.panel-head) {
  background: rgba(15, 23, 42, 0.55);
}
.panel-gap {
  color: var(--slate-400);
}
.src {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--slate-400);
  white-space: nowrap;
}
.pill {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.pill-cited {
  background: rgba(21, 128, 61, 0.18);
  color: #4ade80;
}
.pill-review {
  background: rgba(180, 83, 9, 0.2);
  color: #fbbf24;
}
.pill-gap {
  background: rgba(185, 28, 28, 0.2);
  color: #f87171;
}

/* ---------- Sections ---------- */
.section {
  padding: 84px 0;
}
.section-alt {
  background: #fff;
  border-top: 1px solid var(--slate-200);
  border-bottom: 1px solid var(--slate-200);
}
.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 800;
  margin-bottom: 18px;
}
.centered {
  text-align: center;
}
h2.centered {
  margin-left: auto;
  margin-right: auto;
  max-width: 22ch;
}
.section-lede {
  font-size: 1.12rem;
  color: var(--slate-600);
}
.narrow .section-lede {
  margin: 0 0 18px;
}
.kw {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--gap);
  font-size: 0.95em;
}

/* ---------- Steps ---------- */
.steps {
  list-style: none;
  padding: 0;
  margin: 48px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.steps li {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 26px 24px;
}
.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--slate-900);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 14px;
}
.steps h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}
.steps p {
  margin: 0;
  color: var(--slate-600);
  font-size: 0.98rem;
}

/* ---------- Dark security section ---------- */
.section-dark {
  background: var(--slate-900);
  color: #fff;
}
.light {
  color: #fff;
}
.light-muted {
  color: var(--slate-400);
}
.section-dark .centered {
  margin-left: auto;
  margin-right: auto;
}
.section-dark .section-lede {
  max-width: 60ch;
  margin: 0 auto 14px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 46px;
}
.card {
  background: var(--slate-800);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius);
  padding: 26px 24px;
}
.card h3 {
  font-size: 1.12rem;
  margin-bottom: 10px;
  color: #fff;
}
.card p {
  margin: 0;
  color: var(--slate-300);
  font-size: 0.96rem;
}
.card code {
  background: rgba(56, 189, 248, 0.15);
  color: #7dd3fc;
}

/* ---------- Invariants ---------- */
.invariants {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 44px;
}
.inv {
  border-top: 3px solid var(--cited);
  background: #fff;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 24px 22px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  border-left: 1px solid var(--slate-200);
  border-right: 1px solid var(--slate-200);
  border-bottom: 1px solid var(--slate-200);
}
.inv h3 {
  font-size: 1.08rem;
  margin-bottom: 8px;
}
.inv p {
  margin: 0;
  color: var(--slate-600);
  font-size: 0.96rem;
}

/* ---------- CTA ---------- */
.section-cta {
  background: radial-gradient(900px 500px at 50% -30%, #1e3a5f 0%, var(--slate-900) 60%);
  color: #fff;
}
.section-cta .section-lede {
  max-width: 56ch;
  margin: 14px auto 30px;
}
.contact-line {
  margin-top: 18px;
  color: var(--slate-400);
  font-size: 0.95rem;
}
.contact-line a {
  color: var(--accent);
  text-decoration: underline;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--slate-900);
  color: var(--slate-400);
  padding: 40px 0;
  border-top: 1px solid var(--slate-800);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  align-items: flex-start;
}
.footer-note {
  margin: 8px 0 0;
  max-width: 42ch;
  font-size: 0.9rem;
}
.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: right;
  font-size: 0.85rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }
  .lede {
    max-width: none;
  }
  .steps,
  .cards,
  .invariants {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 640px) {
  .nav-links a:not(.btn) {
    display: none;
  }
  .hero {
    padding: 60px 0 64px;
  }
  .section {
    padding: 60px 0;
  }
  .steps,
  .cards,
  .invariants {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    flex-direction: column;
  }
  .footer-meta {
    text-align: left;
  }
}