/* ============================================
   REEP — Design System
   The Continuity Layer for the Digital Age
   ============================================ */

:root {
  /* Continuity Blue palette */
  --ink:        #0E1320;   /* primary dark surface */
  --ink-soft:   #1A2235;   /* secondary dark surface */
  --ink-line:   #2A3349;   /* dark hairlines/borders */
  --sand:       #FAF6EF;   /* warm light surface */
  --sand-dim:   #F1EBDF;   /* light surface, secondary */
  --paper:      #FFFFFF;
  --continuity: #2BB389;   /* living-green accent */
  --continuity-deep: #1E8C6B;
  --brass:      #C9A86A;   /* sparing legacy accent */
  --slate:      #5B6B7F;   /* body text on light */
  --slate-dim:  #8C96A6;
  --mist:       #B9C2D0;   /* faint text on dark */
  --white-90:   rgba(248, 250, 252, 0.9);
  --white-60:   rgba(248, 250, 252, 0.6);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container: 1280px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 36px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--sand);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .display {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  font-weight: 600;
}

.font-mono { font-family: var(--font-mono); }

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

::selection { background: var(--continuity); color: var(--ink); }

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

/* ---------- Layout ---------- */
.shell {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}
@media (max-width: 768px) {
  .shell { padding-left: 1.25rem; padding-right: 1.25rem; }
}

.surface-dark { background: var(--ink); color: var(--white-90); }
.surface-sand { background: var(--sand); color: var(--ink); }
.surface-soft { background: var(--ink-soft); color: var(--white-90); }
.surface-white { background: var(--paper); color: var(--ink); }

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(14, 19, 32, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--ink-line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 2rem;
  max-width: var(--container);
  margin: 0 auto;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a {
  color: var(--mist);
  transition: color 0.2s ease;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--paper); }
.nav-links a.active { color: var(--continuity); }

@media (max-width: 920px) {
  .nav-links.desktop { display: none; }
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--paper);
  letter-spacing: -0.02em;
}
.logo-mark {
  width: 30px; height: 30px;
  flex-shrink: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.7rem;
  border-radius: 999px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--continuity);
  color: var(--ink);
}
.btn-primary:hover { background: #34C99A; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--ink-line);
  color: var(--white-90);
}
.btn-ghost:hover { border-color: var(--continuity); color: var(--continuity); }

.btn-dark {
  background: var(--ink);
  color: var(--paper);
}
.btn-dark:hover { background: var(--ink-soft); transform: translateY(-1px); }

.btn-lg { padding: 1.1rem 2.3rem; font-size: 1.05rem; }

/* ---------- Eyebrow / labels ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--continuity);
  margin-bottom: 1.1rem;
}
.eyebrow::before {
  content: '';
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--continuity);
}

/* ---------- Heartbeat signature element ---------- */
.heartbeat-line {
  width: 100%;
  height: 64px;
  overflow: hidden;
}
.heartbeat-line svg { width: 100%; height: 100%; display: block; }
.heartbeat-path {
  stroke: var(--continuity);
  stroke-width: 1.75;
  fill: none;
  stroke-dasharray: 1400;
  stroke-dashoffset: 1400;
  animation: heartbeat-draw 3.6s ease-in-out infinite;
}
@keyframes heartbeat-draw {
  0% { stroke-dashoffset: 1400; }
  55% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 0; opacity: 0.25; }
}
@media (prefers-reduced-motion: reduce) {
  .heartbeat-path { animation: none; stroke-dashoffset: 0; }
}

/* ---------- Cards ---------- */
.card {
  background: var(--paper);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  border: 1px solid rgba(14,19,32,0.06);
}
.card-dark {
  background: var(--ink-soft);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  border: 1px solid var(--ink-line);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: var(--mist);
  border-top: 1px solid var(--ink-line);
  padding: 4.5rem 0 2.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2.5rem; }
}
.footer-col h4 {
  color: var(--paper);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.1rem;
  font-weight: 500;
}
.footer-col a {
  display: block;
  color: var(--mist);
  font-size: 0.92rem;
  margin-bottom: 0.7rem;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--continuity); }
.footer-bottom {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--ink-line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--slate-dim);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- Section spacing ---------- */
.section { padding: 7rem 0; }
.section-sm { padding: 4.5rem 0; }
@media (max-width: 768px) {
  .section { padding: 4.5rem 0; }
  .section-sm { padding: 3rem 0; }
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Pill badges ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  font-family: var(--font-mono);
}
.pill-green { background: rgba(43,179,137,0.12); color: var(--continuity-deep); }
.pill-brass { background: rgba(201,168,106,0.15); color: #9C7B3E; }

/* ---------- Utility ---------- */
.text-balance { text-wrap: balance; }
.divider { height: 1px; background: var(--ink-line); border: none; }
.divider-light { height: 1px; background: rgba(14,19,32,0.08); border: none; }

/* ---------- Mobile nav toggle ---------- */
.mobile-toggle {
  display: none;
  background: none; border: none;
  color: var(--paper);
  font-size: 1.5rem;
  cursor: pointer;
}
@media (max-width: 920px) {
  .mobile-toggle { display: block; }
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px; left: 0; right: 0;
  background: var(--ink);
  border-bottom: 1px solid var(--ink-line);
  z-index: 99;
  padding: 1.5rem 2rem 2rem;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 0.85rem 0;
  color: var(--white-90);
  font-size: 1.05rem;
  border-bottom: 1px solid var(--ink-line);
}
.mobile-menu a:last-child { border-bottom: none; }