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

/* ── Design Tokens ── */
:root {
  --bg: #08080f;
  --surface: #0f1119;
  --grid: #1a1a2e;
  --text-primary: #e0e0e8;
  --text-secondary: #6b7094;
  --cyan: #00d4ff;
  --amber: #ffb800;
  --magenta: #ff2d6b;

  --font: 'JetBrains Mono', monospace;
  --max-w: 960px;
  --glow-cyan: 0 0 20px rgba(0, 212, 255, .35);
  --glow-amber: 0 0 20px rgba(255, 184, 0, .3);
  --glow-magenta: 0 0 20px rgba(255, 45, 107, .3);
}

/* ── Body & Background ── */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg);
  overflow-x: hidden;
}

/* Dot-grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(circle, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
}

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, .06) 2px,
    rgba(0, 0, 0, .06) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ── Layout ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  position: relative;
  z-index: 1;
  padding: 100px 0;
}

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(8, 8, 15, .85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grid);
  padding: 0 24px;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.nav-logo {
  font-weight: 700;
  font-size: 14px;
  color: var(--cyan);
  letter-spacing: .15em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  color: var(--text-secondary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: .1em;
  transition: color .2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
}

/* ── Typography ── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }

h2 {
  font-size: 28px;
  margin-bottom: 16px;
}

h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .2em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.highlight-cyan { color: var(--cyan); }
.highlight-amber { color: var(--amber); }
.highlight-magenta { color: var(--magenta); }

/* ── Hero ── */
.hero {
  padding: 180px 0 120px;
  text-align: center;
}

.hero-title {
  font-size: clamp(48px, 10vw, 96px);
  font-weight: 700;
  letter-spacing: .25em;
  color: var(--cyan);
  text-shadow: 0 0 40px rgba(0, 212, 255, .4), 0 0 80px rgba(0, 212, 255, .15);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 12px 28px;
  border-radius: 4px;
  text-decoration: none;
  letter-spacing: .05em;
  transition: all .2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--cyan);
  color: var(--bg);
}

.btn-primary:hover {
  box-shadow: var(--glow-cyan);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--grid);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ── Problem Section ── */
.problem {
  border-left: 3px solid var(--magenta);
  padding-left: 24px;
  max-width: 640px;
}

.problem p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* ── Cards Grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 24px;
  transition: all .25s;
}

.card:hover {
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.card h3 {
  color: var(--cyan);
  font-size: 15px;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-secondary);
  font-size: 13px;
}

/* ── Pipeline Section ── */
.pipeline-section { text-align: center; }

.pipeline-svg {
  display: block;
  margin: 40px auto 0;
  max-width: 500px;
  width: 100%;
  height: auto;
}

/* ── Principles Section ── */
.principle-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.principle-card {
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 24px;
  transition: all .25s;
}

.principle-card:hover {
  border-color: var(--amber);
  box-shadow: var(--glow-amber);
}

.principle-card h3 {
  color: var(--amber);
  font-size: 15px;
  margin-bottom: 8px;
}

.principle-card p {
  color: var(--text-secondary);
  font-size: 13px;
}

.upstream-svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

/* ── CTA Section ── */
.cta-section { text-align: center; }

.code-block {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 20px 24px;
  text-align: left;
  margin: 24px auto;
  max-width: 600px;
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font);
  font-size: 13px;
  color: var(--text-primary);
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--grid);
  color: var(--text-secondary);
  border: none;
  border-radius: 4px;
  padding: 4px 10px;
  font-family: var(--font);
  font-size: 11px;
  cursor: pointer;
  transition: all .2s;
}

.copy-btn:hover {
  background: var(--cyan);
  color: var(--bg);
}

.cta-link {
  display: inline-block;
  margin-top: 16px;
  color: var(--cyan);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}

.cta-link:hover { border-color: var(--cyan); }

/* ── Footer ── */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--grid);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 12px;
  text-decoration: none;
  transition: color .2s;
}

.footer-links a:hover { color: var(--cyan); }

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  section { padding: 72px 0; }
  .hero { padding: 140px 0 80px; }
  .hero-title { letter-spacing: .15em; }
  .cards-grid { grid-template-columns: 1fr; }
  .principle-cards { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 11px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  section { padding: 56px 0; }
  .hero { padding: 120px 0 60px; }
  .hero-subtitle { font-size: 14px; }
  .hero-ctas { flex-direction: column; align-items: center; }
  .nav-links { display: none; }
}