/* ---- Design tokens ---- */
:root {
  --bg: #050505;
  --surface: #0e0e0e;
  --surface-2: #111111;
  --border: rgba(255,255,255,.08);
  --accent: #4f8cff;
  --accent-dim: rgba(79,140,255,.14);
  --text: #f5f5f7;
  --text-dim: #9a9aa2;
  --radius-lg: 22px;
  --radius-md: 16px;
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
  --wrap: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  margin: 0 0 .5em;
  letter-spacing: -0.02em;
}

p { color: var(--text-dim); margin: 0 0 1em; }

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

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 32px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #000;
  padding: 12px 20px;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

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

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn-primary {
  background: var(--accent);
  color: #05070d;
}
.btn-primary:hover { transform: translateY(-1px); background: #6b9fff; }
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: rgba(255,255,255,.24); }

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5,5,5,.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.wordmark {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.primary-nav ul {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.primary-nav a {
  font-size: 14px;
  color: var(--text-dim);
  font-weight: 500;
}
.primary-nav a:hover { color: var(--text); }
.header-cta { margin-left: auto; }
.nav-toggle { display: none; }

.mobile-nav {
  display: none;
}

@media (max-width: 860px) {
  .primary-nav, .header-cta { display: none; }
  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
  }
  .nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text);
    display: block;
  }
  .mobile-nav {
    display: block;
    max-height: 0;
    overflow: hidden;
    border-bottom: 1px solid transparent;
    transition: max-height .25s ease;
  }
  .mobile-nav.open {
    max-height: 320px;
    border-bottom-color: var(--border);
  }
  .mobile-nav ul {
    list-style: none;
    margin: 0;
    padding: 8px 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
  }
  .mobile-nav a { font-size: 15px; color: var(--text-dim); }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  padding: 160px 0 120px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
#topology {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: .55;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
}
.eyebrow {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(40px, 6vw, 84px);
  margin-bottom: 28px;
}
.hero-sub {
  font-size: 19px;
  max-width: 620px;
  margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---- Trust strip ---- */
.trust-strip {
  border-bottom: 1px solid var(--border);
  padding: 28px 0;
}
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
  font-weight: 500;
  letter-spacing: .02em;
}

/* ---- Sections ---- */
.section { padding: 120px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 {
  font-size: clamp(28px, 4vw, 44px);
  max-width: 720px;
}
.section-lead {
  max-width: 620px;
  font-size: 17px;
}

/* ---- Cards ---- */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 56px;
}
.grid-cards-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.card h3 {
  font-size: 19px;
  margin-bottom: 12px;
}
.card p { margin-bottom: 0; font-size: 15px; }
.card-flat { background: transparent; }
.card-tag {
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.ecosystem-examples {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--text-dim);
  opacity: .75;
}

@media (max-width: 860px) {
  .grid-cards, .grid-cards-3 { grid-template-columns: 1fr; }
}

.grid-cards-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1020px) { .grid-cards-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-cards-4 { grid-template-columns: 1fr; } }

.trust-inner-pillars {
  justify-content: center;
  gap: 64px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ---- Pill grid ---- */
.pill-grid {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--surface-2);
}

/* ---- FAQ ---- */
.faq-list {
  margin-top: 48px;
  border-top: 1px solid var(--border);
}
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}
.faq-item summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-size: 20px;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p {
  margin: 16px 0 0;
  font-size: 15px;
  max-width: 640px;
}

/* ---- Final CTA ---- */
.cta-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.cta-inner {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.cta-inner .section-lead { max-width: 560px; }

.challenge-close {
  margin-top: 40px;
  color: var(--text);
  font-size: 18px;
  font-weight: 500;
  max-width: 640px;
}

/* ---- Platform diagram ---- */
.platform-diagram {
  margin-top: 56px;
  display: flex;
  justify-content: center;
}
.diagram-svg {
  width: 100%;
  max-width: 640px;
  height: auto;
}
.diagram-line {
  stroke: var(--border);
  stroke-width: 1.5;
}
.diagram-hub {
  fill: var(--accent);
}
.diagram-hub-text {
  fill: #05070d;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
}
.diagram-node circle {
  fill: var(--surface-2);
  stroke: var(--border);
  stroke-width: 1.5;
}
.diagram-node text {
  fill: var(--text-dim);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
}

/* ---- Philosophy ---- */
.philosophy-wrap { text-align: center; }
.philosophy-wrap h2 { max-width: 100%; }
.philosophy-lead {
  margin: 0 auto 56px;
  font-size: 18px;
}
.philosophy-wrap .stat-list {
  grid-template-columns: repeat(4, 1fr);
  text-align: left;
}
@media (max-width: 720px) {
  .philosophy-wrap .stat-list { grid-template-columns: 1fr 1fr; }
}

/* ---- Solutions ---- */
.solutions-list { margin-top: 56px; }
.solution-row {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--border);
}
.solution-row:last-child { border-bottom: 1px solid var(--border); }
.solution-row h3 { font-size: 20px; margin: 0; }
.solution-row p { margin: 0; max-width: 560px; }

@media (max-width: 720px) {
  .solution-row { grid-template-columns: 1fr; gap: 10px; }
}

/* ---- Company ---- */
.company-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: start;
}
.stat-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 0;
}
.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  background: var(--surface-2);
}
.stat dt {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 8px;
}
.stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
}

@media (max-width: 860px) {
  .company-grid { grid-template-columns: 1fr; }
}

/* ---- Contact ---- */
.section-contact { padding-bottom: 160px; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.contact-form {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row label { font-size: 13px; color: var(--text-dim); font-weight: 500; }
.form-row input, .form-row textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  resize: vertical;
}
.form-row input:focus, .form-row textarea:focus {
  border-color: var(--accent);
}
.contact-form .btn { align-self: flex-start; margin-top: 8px; }

@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 32px;
  align-items: flex-start;
}
.wordmark-footer { display: block; margin-bottom: 8px; }
.footer-inner p { font-size: 14px; margin: 0; }
.footer-inner nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 0;
  padding: 0;
}
.footer-inner nav a { font-size: 14px; color: var(--text-dim); }
.footer-inner nav a:hover { color: var(--text); }
.footer-legal { font-size: 13px; color: var(--text-dim); width: 100%; }