/* Physarum — design system + site styles */

:root{
  color-scheme: light dark;

  /* Neutrals (calm, Swiss-inspired) */
  --bg: #fbfbfa;
  --surface: #ffffff;
  --surface-2: #f4f4f2;
  --text: #101114;
  --muted: #4a4f5a;
  --border: rgba(16,17,20,.12);
  --shadow: 0 18px 50px rgba(16,17,20,.08);

  /* Accent: intelligent “engineering blue-green” */
  --accent: #0f766e;
  --accent-2: #0b4f4a;
  --accent-contrast: #ffffff;

  /* Type */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --fs-0: 0.875rem; /* small */
  --fs-1: 1rem;
  --fs-2: 1.125rem;
  --fs-3: 1.375rem;
  --fs-4: clamp(2rem, 2.5vw + 1.4rem, 3.2rem);
  --fs-5: clamp(2.6rem, 3.2vw + 1.8rem, 4rem);

  --lh-tight: 1.1;
  --lh: 1.45;

  /* Layout */
  --container: 1120px;
  --gutter: 1.25rem;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 26px;

  /* Motion */
  --ease: cubic-bezier(.2,.8,.2,1);
  --dur-1: 120ms;
  --dur-2: 220ms;
  --dur-3: 420ms;
}

[data-theme="dark"]{
  --bg: #0b0d10;
  --surface: #0f1318;
  --surface-2: #141a22;
  --text: #eef1f5;
  --muted: #b2bac7;
  --border: rgba(238,241,245,.12);
  --shadow: 0 18px 70px rgba(0,0,0,.35);

  --accent: #22c1b6;
  --accent-2: #117a72;
  --accent-contrast: #061111;
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family: var(--font-sans);
  font-size: var(--fs-1);
  line-height: var(--lh);
  color: var(--text);
  background: radial-gradient(1400px 900px at 15% -10%, rgba(15,118,110,.08), transparent 55%),
              radial-gradient(900px 700px at 90% 10%, rgba(15,118,110,.06), transparent 60%),
              var(--bg);
  text-rendering: optimizeLegibility;
}

img{ max-width:100%; height:auto; }
a{ color: inherit; text-decoration-color: rgba(15,118,110,.4); text-underline-offset: 3px; }
a:hover{ text-decoration-color: var(--accent); }
::selection{ background: rgba(15,118,110,.20); }

.skip-link{
  position:absolute;
  left:-999px;
  top:auto;
  width:1px; height:1px;
  overflow:hidden;
}
.skip-link:focus{
  left: var(--gutter);
  top: var(--gutter);
  width:auto; height:auto;
  padding:.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
  z-index: 9999;
}

.container{
  max-width: var(--container);
  margin-inline:auto;
  padding-inline: var(--gutter);
}

.grid{
  display:grid;
  gap: 1.1rem;
}
@media (min-width: 860px){
  .grid.cols-2{ grid-template-columns: 1.25fr 1fr; }
  .grid.cols-3{ grid-template-columns: repeat(3, 1fr); }
  .grid.cols-4{ grid-template-columns: repeat(4, 1fr); }
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.4rem .7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  color: var(--muted);
  font-size: var(--fs-0);
}
.pill .dot{
  width:.55rem; height:.55rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(15,118,110,.12);
}

/* Header */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in oklab, var(--bg) 74%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--border) 75%, transparent);
}
.nav{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 0;
}
.brand{
  display:flex;
  align-items:center;
  gap:.7rem;
  text-decoration:none;
}
.brand-mark{
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background:
    radial-gradient(12px 12px at 30% 35%, rgba(255,255,255,.85), transparent 55%),
    radial-gradient(20px 18px at 65% 65%, rgba(0,0,0,.12), transparent 60%),
    linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 55%, #1f2937));
  box-shadow: 0 10px 26px rgba(15,118,110,.22);
  position: relative;
  overflow: hidden;
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:-40%;
  background:
    radial-gradient(closest-side at 30% 30%, rgba(255,255,255,.45), transparent 60%),
    conic-gradient(from 180deg, rgba(255,255,255,.0), rgba(255,255,255,.2), rgba(255,255,255,.0));
  opacity:.75;
  transform: rotate(16deg);
}
.brand-name{
  font-weight: 650;
  letter-spacing: .2px;
}
.brand-tag{
  display:block;
  font-size: var(--fs-0);
  color: var(--muted);
  margin-top: .05rem;
}

.nav-actions{ display:flex; align-items:center; gap:.65rem; }

.nav-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  cursor:pointer;
}
.nav-toggle svg{ width: 18px; height: 18px; }

.nav-links{
  display:none;
  flex-direction: column;
  gap: .25rem;
  padding: .6rem;
  margin: .6rem 0 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--surface) 96%, transparent);
  box-shadow: var(--shadow);
}
.nav-links a{
  padding: .75rem .85rem;
  border-radius: 14px;
  text-decoration:none;
  color: color-mix(in oklab, var(--text) 90%, var(--muted));
}
.nav-links a[aria-current="page"]{
  background: color-mix(in oklab, var(--accent) 10%, var(--surface));
  color: var(--text);
  border: 1px solid color-mix(in oklab, var(--accent) 24%, var(--border));
}
.nav-links a:hover{
  background: color-mix(in oklab, var(--surface-2) 75%, transparent);
}

@media (min-width: 980px){
  .nav-toggle{ display:none; }
  .nav-links{
    display:flex !important;
    flex-direction: row;
    align-items: center;
    gap: .2rem;
    padding: 0;
    margin: 0;
    border: none;
    background: transparent;
    box-shadow: none;
  }
  .nav-links a{
    padding: .55rem .7rem;
    border-radius: 999px;
  }
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.78rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  color: var(--text);
  font-weight: 620;
  letter-spacing:.15px;
  text-decoration:none;
  transition: transform var(--dur-2) var(--ease), background var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
  will-change: transform;
}
.btn:hover{ transform: translateY(-1px); border-color: color-mix(in oklab, var(--accent) 30%, var(--border)); }
.btn:active{ transform: translateY(0); }
.btn.primary{
  background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 55%, #1f2937));
  color: var(--accent-contrast);
  border-color: color-mix(in oklab, var(--accent) 44%, transparent);
}
.btn.primary:hover{
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 90%, white), color-mix(in oklab, var(--accent) 60%, #111827));
}
.btn.ghost{
  background: transparent;
}
.btn.small{ padding: .62rem .85rem; font-size: var(--fs-0); }

.icon-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  cursor: pointer;
  transition: transform var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}
.icon-btn:hover{ transform: translateY(-1px); }
.icon-btn svg{ width: 18px; height: 18px; }

/* Sections */
.section{ padding: 3.2rem 0; }
@media (min-width: 860px){
  .section{ padding: 5rem 0; }
}
.section-title{
  font-size: var(--fs-4);
  line-height: var(--lh-tight);
  margin: 0 0 .7rem;
  letter-spacing: -.02em;
}
.section-kicker{
  color: var(--muted);
  max-width: 68ch;
  margin: 0 0 1.6rem;
  font-size: var(--fs-2);
}

/* Hero */
.hero{
  padding: 2.2rem 0 2.4rem;
}
@media (min-width: 860px){
  .hero{ padding: 4.2rem 0 3.5rem; }
}
.hero-card{
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background:
    radial-gradient(1100px 460px at 30% 0%, rgba(15,118,110,.12), transparent 58%),
    radial-gradient(720px 420px at 94% 20%, rgba(15,118,110,.10), transparent 55%),
    color-mix(in oklab, var(--surface) 96%, transparent);
  box-shadow: var(--shadow);
  overflow: clip;
}
.hero-inner{ padding: 1.6rem; }
@media (min-width: 860px){
  .hero-inner{ padding: 2.4rem 2.6rem; }
}
.hero h1{
  font-size: var(--fs-5);
  line-height: var(--lh-tight);
  margin: .7rem 0 .8rem;
  letter-spacing: -.03em;
}
.lede{
  font-size: var(--fs-3);
  color: color-mix(in oklab, var(--text) 82%, var(--muted));
  max-width: 62ch;
  margin: 0 0 1.3rem;
}
.hero-actions{ display:flex; flex-wrap:wrap; gap:.7rem; margin: 0 0 1.4rem; }
.cred-strip{
  display:grid;
  gap:.7rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in oklab, var(--border) 85%, transparent);
  color: var(--muted);
  font-size: var(--fs-0);
}
@media (min-width: 860px){
  .cred-strip{ grid-template-columns: repeat(3, 1fr); }
}
.cred-item{
  display:flex;
  align-items:flex-start;
  gap:.7rem;
}
.cred-item svg{ flex: 0 0 auto; margin-top:.1rem; }

/* Cards */
.card{
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 96%, transparent);
  box-shadow: 0 12px 40px rgba(16,17,20,.06);
  padding: 1.15rem;
}
.card h3{
  margin: .2rem 0 .45rem;
  font-size: 1.15rem;
  letter-spacing: -.01em;
}
.card p{ margin: 0; color: color-mix(in oklab, var(--text) 82%, var(--muted)); }
.card .meta{
  margin-top: .85rem;
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
}

.list{
  margin: .9rem 0 0;
  padding: 0 0 0 1.05rem;
  color: color-mix(in oklab, var(--text) 84%, var(--muted));
}
.list li{ margin: .35rem 0; }

/* Pathfinding motif (subtle background) */
.flow{
  position:relative;
}
.flow::before{
  content:"";
  position:absolute;
  inset:-1px;
  pointer-events:none;
  background:
    radial-gradient(800px 340px at 15% 30%, rgba(15,118,110,.10), transparent 60%),
    radial-gradient(520px 320px at 70% 15%, rgba(15,118,110,.08), transparent 60%),
    linear-gradient(90deg, transparent, rgba(15,118,110,.06), transparent);
  mask-image:
    radial-gradient(closest-side at 20% 35%, rgba(0,0,0,.9), transparent 70%),
    linear-gradient(0deg, rgba(0,0,0,.6), rgba(0,0,0,0));
  opacity: .9;
  border-radius: inherit;
}

/* Steps */
.steps{ counter-reset: step; }
.step{
  position:relative;
  padding-left: 3.1rem;
}
.step::before{
  counter-increment: step;
  content: counter(step);
  position:absolute;
  left: 1rem;
  top: 1rem;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display:grid;
  place-items:center;
  font-family: var(--font-mono);
  font-size: .9rem;
  color: color-mix(in oklab, var(--text) 88%, var(--muted));
  background: color-mix(in oklab, var(--surface-2) 75%, transparent);
  border: 1px solid var(--border);
}

/* Testimonials */
.quote{
  display:flex;
  flex-direction: column;
  gap:.75rem;
}
.quote p{
  margin:0;
  font-size: 1.05rem;
  color: color-mix(in oklab, var(--text) 90%, var(--muted));
}
.quote footer{
  font-size: var(--fs-0);
  color: var(--muted);
}
.quote .tag{
  display:inline-block;
  margin-left:.35rem;
  padding:.2rem .5rem;
  border-radius: 999px;
  border:1px solid var(--border);
  background: color-mix(in oklab, var(--surface-2) 70%, transparent);
}

/* Forms */
label{ display:block; font-weight: 600; margin: .8rem 0 .35rem; }
input, textarea, select{
  width:100%;
  padding:.85rem .9rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 94%, transparent);
  color: var(--text);
  font: inherit;
}
textarea{ min-height: 140px; resize: vertical; }
input:focus, textarea:focus, select:focus, button:focus, a:focus{
  outline: 3px solid color-mix(in oklab, var(--accent) 35%, transparent);
  outline-offset: 2px;
}
.form-row{
  display:grid;
  gap: .9rem;
}
@media (min-width: 860px){
  .form-row.cols-2{ grid-template-columns: 1fr 1fr; }
}
.form-help{ margin:.5rem 0 0; color: var(--muted); font-size: var(--fs-0); }
.form-actions{ display:flex; gap:.7rem; flex-wrap: wrap; margin-top: 1rem; }

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  padding: 2.2rem 0;
}
.footer-grid{
  display:grid;
  gap: 1.1rem;
}
@media (min-width: 860px){
  .footer-grid{ grid-template-columns: 1.4fr 1fr 1fr; }
}
.footer-title{ font-weight: 700; margin: 0 0 .4rem; }
.footer-links{ display:grid; gap:.35rem; margin: .4rem 0 0; }
.footer-links a{ text-decoration:none; color: color-mix(in oklab, var(--text) 86%, var(--muted)); }
.footer-links a:hover{ color: var(--text); text-decoration: underline; text-decoration-color: rgba(15,118,110,.35); }
.fineprint{
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in oklab, var(--border) 85%, transparent);
  color: var(--muted);
  font-size: var(--fs-0);
  display:flex;
  flex-wrap:wrap;
  gap:.8rem;
  justify-content: space-between;
}

/* Reveal motion */
.reveal{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--dur-3) var(--ease), transform var(--dur-3) var(--ease);
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; transition:none; }
  .btn, .icon-btn{ transition:none; }
}