/* Pulalu: Puzzle (Midnight) · Lattice (Cobalt) · Lucidity (Azure) */
:root {
  --pu: #0F2547;
  --la: #1F4FBF;
  --lu: #2B74D9;
  --edge-opacity: .5;

  --bg: #FFFFFF;
  --bg-tint: #F4F7FC;
  --surface: #FFFFFF;
  --ink: #0F2547;
  --muted: #55647D;
  --line: #E1E7F0;
  --header-bg: rgba(255, 255, 255, .82);
  --shadow: 0 1px 2px rgba(15, 37, 71, .06), 0 8px 24px rgba(15, 37, 71, .06);

  --radius: 18px;
  --wrap: 1120px;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-head: "Outfit", var(--font-body);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --pu: #EAF0FB;
    --la: #A7BDF1;
    --lu: #7DAAE8;
    --edge-opacity: .45;
    --bg: #0A1428;
    --bg-tint: #0D1A33;
    --surface: #10203D;
    --ink: #EAF0FB;
    --muted: #9AA9C4;
    --line: #1E3156;
    --header-bg: rgba(10, 20, 40, .8);
   
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}
:root[data-theme="dark"] {
  --pu: #EAF0FB; --la: #A7BDF1; --lu: #7DAAE8; --edge-opacity: .45;
  --bg: #0A1428; --bg-tint: #0D1A33; --surface: #10203D; --ink: #EAF0FB; --muted: #9AA9C4;
  --line: #1E3156; --header-bg: rgba(10, 20, 40, .8);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.1; letter-spacing: -.02em; margin: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* Logo colours */
.pu { fill: var(--pu); }
.la { fill: var(--la); }
.lu { fill: var(--lu); }
.edge { fill: none; stroke: var(--la); stroke-opacity: var(--edge-opacity); stroke-width: 13; stroke-linecap: round; }
.s-pu { stroke: var(--pu); }
.s-la { stroke: var(--la); }
.s-lu { stroke: var(--lu); }
.c-pu { color: var(--pu); }
.c-la { color: var(--la); }
.c-lu { color: var(--lu); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--header-bg);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 33px; height: 34px; }
.brand-word { width: 87px; height: 24px; }
.nav { display: flex; align-items: center; gap: 28px; font-size: 15px; font-weight: 500; }
.nav a { text-decoration: none; color: var(--muted); transition: color .15s; }
.nav a:hover { color: var(--ink); }
.nav .nav-cta { color: #fff; background: var(--la); padding: 8px 16px; border-radius: 999px; }
.nav .nav-cta:hover { color: #fff; background: var(--lu); }
:root[data-theme="dark"] .nav .nav-cta { color: #0A1428; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .nav .nav-cta { color: #0A1428; } }

/* Shared */
.eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--la); margin: 0 0 14px;
}
.section { padding: 104px 0; }
.section-tint { background: var(--bg-tint); }
.section h2 { font-size: clamp(32px, 4vw, 44px); margin-bottom: 16px; }
.section-lead { color: var(--muted); font-size: 19px; max-width: 640px; margin: 0; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.actions.center { justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 24px; border-radius: 999px;
  font-weight: 600; font-size: 16px; text-decoration: none;
  transition: transform .15s, background .15s, border-color .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--la); color: #fff; }
.btn-primary:hover { background: var(--lu); }
.btn-ghost { border: 1.5px solid var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--la); }
:root[data-theme="dark"] .btn-primary { color: #0A1428; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-primary { color: #0A1428; } }

/* Hero */
.hero { padding: 88px 0 104px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(44px, 6.4vw, 76px); font-weight: 700; }
.grad {
  background: linear-gradient(90deg, var(--pu), var(--la) 55%, var(--lu));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: 20px; color: var(--muted); max-width: 540px; margin: 24px 0 0; }
.hero-art { display: flex; justify-content: center; }
.network { width: min(420px, 100%); height: auto; overflow: visible; }
.network .edges path { stroke: var(--la); stroke-opacity: calc(var(--edge-opacity) * .7); stroke-width: 7; stroke-linecap: round; }
.network .pulses path {
  fill: none; stroke: var(--lu); stroke-width: 7; stroke-linecap: round;
  stroke-dasharray: 14 200; stroke-dashoffset: 14;
  animation: pulse 3.2s cubic-bezier(.45, 0, .55, 1) infinite;
}
.network .pulses path.late { animation-name: pulse-late; }
.network .answer { transform-origin: 100px 28px; animation: glow 3.2s ease-in-out infinite; }
@keyframes pulse {
  0% { stroke-dashoffset: 14; opacity: 0; }
  5% { opacity: 1; }
  45% { stroke-dashoffset: -100; opacity: 1; }
  50%, 100% { stroke-dashoffset: -100; opacity: 0; }
}
@keyframes pulse-late {
  0%, 40% { stroke-dashoffset: 14; opacity: 0; }
  45% { opacity: 1; }
  80% { stroke-dashoffset: -100; opacity: 1; }
  85%, 100% { stroke-dashoffset: -100; opacity: 0; }
}
@keyframes glow {
  0%, 74% { transform: scale(1); filter: none; }
  84% { transform: scale(1.25); filter: drop-shadow(0 0 10px var(--lu)); }
  100% { transform: scale(1); filter: none; }
}
@media (prefers-reduced-motion: reduce) {
  .network .pulses { display: none; }
  .network .answer { animation: none; }
  html { scroll-behavior: auto; }
}

/* Services */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
}
.card h3 { font-size: 22px; margin: 20px 0 10px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card strong { color: var(--ink); }
.card-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--bg-tint); border: 1px solid var(--line);
}
.card-icon svg { width: 28px; height: 28px; fill: var(--la); }
.card-icon .line { fill: none; stroke: var(--la); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* Selected work */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; }
.case {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.case .case-tag {
  align-self: flex-start; margin: 0 0 18px; padding: 4px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 600; color: var(--la); background: var(--bg-tint); border: 1px solid var(--line);
}
.case h3 { font-size: 22px; margin: 0 0 10px; }
.case p { margin: 0; color: var(--muted); font-size: 16px; }
.case .case-scope {
  margin-top: auto; padding-top: 20px; font-size: 13px; font-weight: 500; color: var(--lu);
}

/* Approach */
.steps { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step {
  position: relative; padding: 28px 28px 30px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line); border-top: 4px solid var(--c);
}
.step-pu { --c: var(--pu); }
.step-la { --c: var(--la); }
.step-lu { --c: var(--lu); }
.step-word { font-family: var(--font-head); font-size: 34px; font-weight: 600; letter-spacing: -.02em; color: var(--muted); }
.step-word b { color: var(--c); font-weight: 700; }
.step p { margin: 10px 0 0; color: var(--muted); font-size: 16px; }

/* About */
.about { display: grid; grid-template-columns: 1fr 1.4fr; gap: 56px; align-items: start; }
.about-body > p { font-size: 18px; margin: 0 0 18px; }
.about-body > p:first-child { font-size: 20px; }
.about-body blockquote {
  margin: 28px 0 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--lu);
  font-family: var(--font-head); font-size: 22px; line-height: 1.35; color: var(--ink);
}
.links { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 10px; }
.links a {
  display: flex; justify-content: space-between; gap: 16px; padding: 16px 20px;
  border: 1px solid var(--line); border-radius: 14px; text-decoration: none; font-weight: 600;
  transition: border-color .15s, transform .15s;
}
.links a:hover { border-color: var(--la); transform: translateX(2px); }
.links span { color: var(--muted); font-weight: 400; }

/* Podcast (a side project, kept low-key inside About) */
.side-card {
  margin-top: 36px; padding: 24px 24px 22px; border-radius: var(--radius);
  background: var(--bg-tint); border: 1px solid var(--line);
}
.side-label { margin: 0 0 6px; font-size: 12px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.side-card h3 { font-size: 20px; margin: 0 0 8px; }
.side-card p { margin: 0; color: var(--muted); font-size: 15px; }
.listen { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.listen a {
  font-size: 14px; font-weight: 600; text-decoration: none; color: var(--la);
  padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  transition: border-color .15s;
}
.listen a:hover { border-color: var(--la); }

/* Contact */
.contact { text-align: center; }
.contact .section-lead { margin: 0 auto; }
.contact-mark { width: 64px; height: 66px; margin-bottom: 20px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0; font-size: 14px; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid, .about { grid-template-columns: 1fr; gap: 40px; }
  .hero-art { order: -1; }
  .network { width: 240px; }
  .cards, .cases, .steps { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .hero { padding: 48px 0 72px; }
}
@media (max-width: 680px) {
  .wrap { padding: 0 16px; }
  .nav a:not(.nav-cta) { display: none; }
}