/* ==========================================================================
   Byzentra — Design Tokens
   ========================================================================== */
:root {
  --color-bg: #0E2A3D;
  --color-bg-deep: #081B28;
  --color-card: #123A4F;
  --color-card-hover: #16465E;
  --color-line: rgba(159, 179, 200, 0.16);
  --color-line-strong: rgba(159, 179, 200, 0.35);
  --color-cyan: #5FA8C7;
  --color-amber: #E8A33D;
  --color-amber-soft: #F4C77A;
  --color-text: #F2F6FA;
  --color-text-muted: #9FB3C8;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --radius-sm: 4px;
  --radius-md: 12px;
  --container: 1180px;
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.2rem, 4.2vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; color: var(--color-text-muted); }

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-amber);
  margin-bottom: 1em;
  text-transform: uppercase;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-amber);
  color: #0E2A3D;
  padding: 10px 16px;
  z-index: 999;
}
.skip-link:focus { left: 12px; top: 12px; }

:focus-visible {
  outline: 2px solid var(--color-amber);
  outline-offset: 3px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--color-amber);
  color: #0E2A3D;
}
.btn-primary:hover { background: var(--color-amber-soft); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  border-color: var(--color-line-strong);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-amber); color: var(--color-amber); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 42, 61, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 24px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}
.nav {
  display: flex;
  gap: 28px;
  font-size: 0.92rem;
  margin-left: auto;
  margin-right: 24px;
}
.nav a { color: var(--color-text-muted); transition: color 0.2s ease; }
.nav a:hover { color: var(--color-text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: 88px 0 64px;
  position: relative;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-copy .lead {
  font-size: 1.08rem;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.pipeline-svg { width: 100%; height: auto; }
.node circle, .node polygon {
  fill: var(--color-card);
  stroke: var(--color-cyan);
  stroke-width: 1.6;
}
.node-core polygon {
  fill: var(--color-bg-deep);
  stroke: var(--color-amber);
  stroke-width: 2;
}
.node text {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--color-text);
  text-anchor: middle;
  dominant-baseline: middle;
}
.node-core-label { font-size: 10px; fill: var(--color-amber-soft); }

.flow-line {
  stroke: var(--color-cyan);
  stroke-dasharray: 6 8;
  opacity: 0.7;
  animation: flow 2.6s linear infinite;
}
@keyframes flow {
  to { stroke-dashoffset: -140; }
}

/* ==========================================================================
   Stats
   ========================================================================== */
.stats {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 36px 0;
  background: var(--color-bg-deep);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--color-amber);
}
.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   Features
   ========================================================================== */
.features, .how-it-works, .about, .testimonials, .contact {
  padding: 88px 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  transition: background 0.2s ease, transform 0.2s ease;
}
.feature-card:hover { background: var(--color-card-hover); transform: translateY(-3px); }
.feature-icon {
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  color: var(--color-amber);
}
.feature-card h3 { margin-bottom: 0.4em; }
.feature-card p { font-size: 0.93rem; margin-bottom: 0; }

/* ==========================================================================
   How it works
   ========================================================================== */
.how-it-works { background: var(--color-bg-deep); }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 36px;
  counter-reset: step;
}
.steps li {
  border-top: 2px solid var(--color-amber);
  padding-top: 20px;
  position: relative;
}
.step-num {
  display: block;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  font-size: 0.85rem;
  margin-bottom: 10px;
}
.steps p { font-size: 0.93rem; }

/* ==========================================================================
   About
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
}
.values { display: flex; flex-direction: column; gap: 22px; }
.value-item {
  border-left: 2px solid var(--color-amber);
  padding-left: 18px;
}
.value-item p { font-size: 0.92rem; margin-bottom: 0; }

/* ==========================================================================
   Testimonials
   ========================================================================== */
.testimonials { background: var(--color-bg-deep); }
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.testimonial-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  margin: 0;
}
.testimonial-card p {
  color: var(--color-text);
  font-size: 0.98rem;
  margin-bottom: 16px;
}
.testimonial-card footer {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}
.testimonial-note {
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.75;
}

/* ==========================================================================
   CTA banner
   ========================================================================== */
.cta-banner {
  padding: 72px 0;
  background: linear-gradient(135deg, var(--color-bg-deep), var(--color-bg));
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}
.cta-inner { text-align: center; max-width: 560px; margin: 0 auto; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
.contact-info { margin-top: 24px; display: flex; flex-direction: column; gap: 14px; }
.contact-info li { display: flex; align-items: center; gap: 12px; color: var(--color-text-muted); }
.contact-info svg { width: 20px; height: 20px; color: var(--color-amber); flex-shrink: 0; }

.contact-form {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
}
.form-row { margin-bottom: 18px; display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 0.85rem; color: var(--color-text-muted); }
.form-row input, .form-row textarea {
  background: var(--color-bg-deep);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus { border-color: var(--color-amber); outline: none; }
.form-note { font-size: 0.88rem; color: var(--color-amber-soft); margin: 14px 0 0; min-height: 1.2em; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-line);
  padding-top: 56px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}
.footer-brand p:last-child { font-size: 0.9rem; max-width: 280px; }
.footer-col h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}
.footer-col { display: flex; flex-direction: column; }
.footer-col a {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  padding: 5px 0;
  transition: color 0.2s ease;
}
.footer-col a:hover { color: var(--color-amber); }
.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding: 20px 0;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .flow-line { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition: none !important; }
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .hero-inner, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-diagram { order: -1; }
}

@media (max-width: 720px) {
  .nav { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .site-header.nav-open .nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: 16px 24px 24px;
    gap: 16px;
    margin: 0;
  }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}