/* =========================================================
   BKDev — one-page site. White / navy / cyan, high contrast.
   ========================================================= */

:root {
  --navy: #0E2A5E;
  --navy-deep: #081B3D;
  --cyan: #17AEC7;
  --cyan-light: #6FE0EE;
  --white: #FFFFFF;
  --bg-soft: #F3F7FC;
  --ink: #0B1B33;
  --ink-muted: #55647F;
  --line: #DDE6F2;
  --line-on-navy: rgba(255, 255, 255, 0.18);

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4.5rem;
  --space-6: 7rem;
  --radius: 10px;
  --maxw: 1180px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-3); }

.eyebrow {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
  display: inline-block;
  margin: 0 0 var(--space-2);
}
.section-navy .eyebrow { color: var(--cyan-light); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
  color: var(--navy-deep);
}
.section-navy h1, .section-navy h2, .section-navy h3, .section-navy h4 { color: var(--white); }

h1 { font-size: clamp(2.3rem, 5.4vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); }
h3 { font-size: 1.2rem; }

p { color: var(--ink-muted); margin: 0 0 var(--space-2); max-width: 62ch; }
p.lead { color: var(--ink); font-size: 1.15rem; }
.section-navy p { color: rgba(255, 255, 255, 0.72); }
.section-navy p.lead { color: var(--white); }

.section { padding: var(--space-6) 0; position: relative; }
.section-soft { background: var(--bg-soft); }
.section-navy { background: var(--navy-deep); }
.section-head { max-width: 640px; margin-bottom: var(--space-4); }
.center { text-align: center; margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.9em 1.6em;
  border-radius: var(--radius);
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
  cursor: pointer;
}
.btn-primary {
  background: var(--cyan);
  color: var(--navy-deep);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 24px -10px rgba(23, 174, 199, 0.55); }
.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}
.btn-outline:hover { transform: translateY(-3px); background: var(--navy); color: var(--white); }
.section-navy .btn-outline { color: var(--white); border-color: var(--line-on-navy); }
.section-navy .btn-outline:hover { background: var(--white); color: var(--navy-deep); }

.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled { box-shadow: 0 8px 24px -18px rgba(14, 42, 94, 0.35); }
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem var(--space-3);
  max-width: var(--maxw);
  margin: 0 auto;
}
.logo-mark { height: 34px; width: auto; }
.logo-link { display: inline-flex; align-items: center; }

.nav-links {
  list-style: none;
  display: none;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
}
@media (min-width: 760px) { .nav-links { display: flex; } }
.nav-links a {
  text-decoration: none;
  color: var(--ink-muted);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--navy); border-color: var(--cyan); }

.nav-cta { display: none; }
@media (min-width: 760px) { .nav-cta { display: inline-flex; } }

.nav-toggle {
  display: inline-flex;
  background: none;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  color: var(--navy);
  padding: 0.5em 0.7em;
  font-family: var(--font-display);
  font-weight: 600;
}
@media (min-width: 760px) { .nav-toggle { display: none; } }

body.nav-open .nav-links {
  display: flex;
  position: fixed;
  top: 64px; left: 0; right: 0;
  flex-direction: column;
  background: var(--white);
  padding: var(--space-2) var(--space-3) var(--space-3);
  gap: var(--space-2);
  border-bottom: 1px solid var(--line);
}

/* ---------- Hero ---------- */
.hero {
  padding: calc(var(--space-6) + 3rem) 0 var(--space-5);
  background:
    radial-gradient(1100px 480px at 78% -10%, rgba(23, 174, 199, 0.14), transparent 60%),
    var(--white);
}
.hero-grid { display: grid; gap: var(--space-5); }
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.05fr 0.95fr; align-items: center; } }

.hero-logo { height: 46px; width: auto; margin-bottom: var(--space-3); }

/* ---------- Pipeline signature diagram ---------- */
.pipeline { width: 100%; height: auto; overflow: visible; }
.pipeline .rail { stroke: var(--line); stroke-width: 2; fill: none; }
.pipeline .packet {
  stroke: var(--cyan);
  stroke-width: 3.5;
  stroke-linecap: round;
  fill: none;
  stroke-dasharray: 10 220;
}
@media (prefers-reduced-motion: no-preference) {
  .pipeline .packet { animation: flow 3.4s linear infinite; }
}
@keyframes flow { to { stroke-dashoffset: -460; } }
.pipeline .node circle { fill: var(--white); stroke: var(--navy); stroke-width: 2; }
.pipeline .node.active circle { stroke: var(--cyan); fill: var(--bg-soft); }
.pipeline .node text { font-family: var(--font-display); font-weight: 700; fill: var(--navy); font-size: 11px; }
.pipeline .node .sub { fill: var(--ink-muted); font-weight: 500; font-size: 9px; }

/* ---------- Cards ---------- */
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: 0 20px 40px -32px rgba(14, 42, 94, 0.25);
}
.card-code {
  font-family: var(--font-display);
  color: var(--cyan);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-1);
}

.grid-2 { display: grid; gap: var(--space-3); }
@media (min-width: 760px) { .grid-2 { grid-template-columns: 1fr 1fr; } }
.grid-4 { display: grid; gap: var(--space-3); }
@media (min-width: 900px) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }

.capability-list { list-style: none; margin: var(--space-2) 0 0; padding: 0; font-size: 0.92rem; }
.capability-list li {
  padding: 0.4em 0 0.4em 1.3em;
  position: relative;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
}
.capability-list li:first-child { border-top: none; }
.capability-list li::before { content: "▸"; color: var(--cyan); position: absolute; left: 0; font-weight: 700; }

/* ---------- Process steps ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-3); }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.step { border-top: 3px solid var(--cyan); padding-top: var(--space-2); }
.step-index {
  font-family: var(--font-display);
  color: var(--cyan-light);
  font-weight: 700;
  font-size: 0.8rem;
  display: block;
  margin-bottom: 0.4em;
}

/* ---------- Founders ---------- */
.founders-grid { display: grid; gap: var(--space-3); }
@media (min-width: 760px) { .founders-grid { grid-template-columns: 1fr 1fr; } }
.founder-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-on-navy);
  border-radius: var(--radius);
  padding: var(--space-3);
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}
.founder-avatar {
  flex: none;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--navy));
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.founder-name { color: var(--white); margin-bottom: 0.15em; }
.founder-role {
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--cyan-light);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.6em;
}
.founder-bio { color: rgba(255, 255, 255, 0.72); font-size: 0.94rem; margin-bottom: 0.8em; }
.founder-link {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.founder-link:hover { color: var(--cyan-light); }
.founder-note {
  margin-top: var(--space-3);
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.55);
}

/* ---------- CTA ---------- */
.cta-banner {
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--navy), var(--navy-deep));
  padding: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.cta-banner h2, .cta-banner p { color: var(--white); }
.cta-banner p { color: rgba(255, 255, 255, 0.75); margin: 0; }

/* ---------- Forms ---------- */
.contact-grid { display: grid; gap: var(--space-4); }
@media (min-width: 860px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.form-field { margin-bottom: var(--space-2); }
.form-field label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--ink-muted);
  margin-bottom: 0.4em;
}
.form-field input, .form-field textarea {
  width: 100%;
  background: var(--white);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.98rem;
  padding: 0.85em 0.95em;
  transition: border-color 0.15s ease;
}
.form-field input:focus, .form-field textarea:focus { border-color: var(--cyan); }
.form-field textarea { resize: vertical; min-height: 130px; }
.form-note { font-size: 0.82rem; color: var(--ink-muted); margin-top: var(--space-2); }
.form-status { font-family: var(--font-display); font-weight: 600; font-size: 0.85rem; color: var(--navy); margin-top: var(--space-2); }

.channel-list { list-style: none; padding: 0; margin: 0; }
.channel-list li { padding: var(--space-2) 0; border-top: 1px solid var(--line); }
.channel-list li:first-child { border-top: none; padding-top: 0; }
.channel-list .label {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--cyan);
  margin-bottom: 0.3em;
}
.channel-list a { text-decoration: none; font-size: 1.05rem; color: var(--navy-deep); font-weight: 600; }
.channel-list a:hover { color: var(--cyan); }
.channel-list span { color: var(--ink-muted); }

/* ---------- Footer ---------- */
.site-footer { padding: var(--space-4) 0 var(--space-3); font-size: 0.88rem; color: rgba(255,255,255,0.6); }
.footer-grid {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3);
}
.footer-logo { height: 26px; filter: brightness(0) invert(1); }
.footer-links { list-style: none; display: flex; gap: var(--space-3); padding: 0; margin: 0; font-family: var(--font-display); font-size: 0.82rem; }
.footer-links a { text-decoration: none; color: rgba(255,255,255,0.65); }
.footer-links a:hover { color: var(--cyan-light); }
.footer-fine { border-top: 1px solid var(--line-on-navy); padding-top: var(--space-2); }

/* =========================================================
   Scroll-triggered reveal system — distinct per section
   ========================================================= */
[data-anim] { will-change: transform, opacity, clip-path; }

@media (prefers-reduced-motion: no-preference) {
  [data-anim="fade-up"] {
    opacity: 0; transform: translateY(36px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  }
  [data-anim="fade-up"].is-visible { opacity: 1; transform: translateY(0); }

  [data-anim="scale-in"] {
    opacity: 0; transform: scale(0.9);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  }
  [data-anim="scale-in"].is-visible { opacity: 1; transform: scale(1); }

  [data-anim="slide-left"] {
    opacity: 0; transform: translateX(-56px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  }
  [data-anim="slide-left"].is-visible { opacity: 1; transform: translateX(0); }

  [data-anim="slide-right"] {
    opacity: 0; transform: translateX(56px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  }
  [data-anim="slide-right"].is-visible { opacity: 1; transform: translateX(0); }

  [data-anim="clip-reveal"] {
    clip-path: inset(0 0 100% 0);
    transition: clip-path 0.9s var(--ease);
  }
  [data-anim="clip-reveal"].is-visible { clip-path: inset(0 0 0% 0); }

  [data-stagger] > * {
    opacity: 0; transform: translateY(28px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  }
  [data-stagger].is-visible > * { opacity: 1; transform: translateY(0); }
  [data-stagger].is-visible > *:nth-child(1) { transition-delay: 0.02s; }
  [data-stagger].is-visible > *:nth-child(2) { transition-delay: 0.14s; }
  [data-stagger].is-visible > *:nth-child(3) { transition-delay: 0.26s; }
  [data-stagger].is-visible > *:nth-child(4) { transition-delay: 0.38s; }
}

/* Hero plays on load, not on scroll */
.hero-anim { opacity: 0; transform: translateY(20px); }
@media (prefers-reduced-motion: no-preference) {
  .hero-anim { animation: heroIn 0.9s var(--ease) forwards; }
  .hero-anim.d1 { animation-delay: 0.05s; }
  .hero-anim.d2 { animation-delay: 0.2s; }
  .hero-anim.d3 { animation-delay: 0.35s; }
  .hero-anim.d4 { animation-delay: 0.5s; }
}
@keyframes heroIn { to { opacity: 1; transform: translateY(0); } }

.page-hero { padding: calc(var(--space-5) + 3rem) 0 var(--space-3); }