:root {
  --ink: #1a2230;
  --ink-soft: #566172;
  --paper: #fdfdfc;
  --paper-alt: #f4f6f8;
  --accent: #3d6bb3;
  --accent-soft: #eaf1fa;
  --accent-deep: #2b4d84;
  --line: #e4e7ec;
  --dash: #b9c5d4;
  --max: 1100px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--ink);
  line-height: 1.2;
}

a { color: var(--accent); }

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(253, 253, 252, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.nav-brand { display: flex; align-items: center; }
.nav-brand img { height: 34px; width: auto; }
.nav-links {
  display: flex;
  gap: 26px;
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 120ms ease;
}
.nav-links a:hover { color: var(--accent-deep); }

/* ---------- HERO ---------- */
.hero {
  padding: 88px 0 72px;
  background:
    radial-gradient(52% 65% at 82% 30%, var(--accent-soft) 0%, rgba(234, 241, 250, 0) 100%),
    var(--paper);
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  color: var(--accent);
  font-weight: 650;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  margin: 0 0 20px;
}
.hero .lede {
  font-size: 1.14rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 48ch;
}
.hero-media { display: flex; justify-content: center; }
.hero-media img {
  max-height: 400px;
  width: auto;
  filter: drop-shadow(0 24px 40px rgba(26, 34, 48, 0.14));
}

/* ---------- SECTIONS ---------- */
section { padding: 76px 0; }
section.alt { background: var(--paper-alt); }
.section-head { max-width: 660px; margin: 0 0 40px; }
.section-head .eyebrow { margin-bottom: 10px; }
.section-head h2 { font-size: 1.85rem; margin: 0 0 14px; }
.section-head p { color: var(--ink-soft); margin: 0; }

/* ---------- ABOUT / SETTING ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 52px;
  align-items: center;
}
.about-grid .section-head { margin-bottom: 28px; }

.stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
}
section:not(.alt) .stat { background: var(--paper-alt); border-color: transparent; }
.stat .num {
  display: block;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent-deep);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 6px;
}
.stat .cap { color: var(--ink-soft); font-size: 0.9rem; line-height: 1.5; display: block; }

a.src {
  font-size: 0.72rem;
  color: #9aa3af;
  text-decoration: none;
  white-space: nowrap;
}
a.src:hover { color: var(--accent); text-decoration: underline; }

.about-photo { margin: 0; }
.about-photo img {
  border-radius: 14px;
  width: 100%;
  box-shadow: 0 14px 36px rgba(26, 34, 48, 0.12);
}
.about-photo figcaption {
  font-size: 0.84rem;
  color: var(--ink-soft);
  margin-top: 12px;
}

/* ---------- How it works: diagram ---------- */

.diagram { margin: 48px 0; }
.dg-flow {
  display: grid;
  grid-template-columns: 150px 40px 1fr 40px 150px;
  align-items: center;
}
.dg-node { text-align: center; padding: 0 4px; }
.dg-node .dg-chip {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}
.dg-node svg { width: 26px; height: 26px; stroke: var(--accent); }
.dg-node p {
  margin: 0;
  font-size: 0.87rem;
  color: var(--ink);
  line-height: 1.4;
}
.dg-arrow { display: flex; justify-content: center; }
.dg-arrow svg { width: 26px; height: 26px; stroke: var(--dash); }

.dg-device {
  position: relative;
  border: 1.5px dashed var(--dash);
  border-radius: 14px;
  padding: 30px 22px 20px;
  background: rgba(61, 90, 128, 0.03);
}
.dg-tag {
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  padding: 0 12px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  white-space: nowrap;
}
.dg-steps {
  display: grid;
  grid-template-columns: 1fr 26px 1fr 26px 1fr;
  align-items: stretch;
  gap: 0;
}
.dg-step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 12px 14px;
  text-align: center;
}
.dg-step svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent);
  margin: 0 auto 8px;
  display: block;
}
.dg-step strong { display: block; font-size: 0.92rem; margin-bottom: 4px; }
.dg-step span { font-size: 0.78rem; color: var(--ink-soft); line-height: 1.4; display: block; }
.dg-mini-arrow { display: flex; align-items: center; justify-content: center; }
.dg-mini-arrow svg { width: 18px; height: 18px; stroke: var(--dash); }

.dg-kb {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--dash);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: left;
}
.dg-kb svg { width: 24px; height: 24px; stroke: var(--accent); flex: 0 0 auto; }
.dg-kb strong { display: block; font-size: 0.88rem; }
.dg-kb span { font-size: 0.78rem; color: var(--ink-soft); line-height: 1.4; }

/* ---------- FEATURES ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature {
  background: var(--paper-alt);
  border-radius: 14px;
  padding: 26px 26px 22px;
}
.feature h3 { font-size: 1.06rem; margin: 0 0 10px; }
.feature p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- IMPACT ---------- */
.impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 56px;
}
.impact-grid figure {
  margin: 0;
  border-radius: 14px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
}
.impact-grid img { width: 100%; height: 230px; object-fit: cover; }
.impact-grid figcaption {
  padding: 12px 16px 14px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.5;
}

.impact-sub { margin-top: 56px; }
.impact-sub h3 {
  font-size: 1.3rem;
  margin: 0 0 12px;
}
.impact-sub > p {
  color: var(--ink-soft);
  max-width: 72ch;
  margin: 0 0 26px;
}

.stat-row-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 26px;
}
.chart {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.chart img { border-radius: 6px; }
.charts-note {
  font-size: 0.8rem;
  color: #9aa3af;
  margin: 12px 4px 0;
}

/* ---------- RESEARCH ---------- */
.pub-card {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  background: var(--paper-alt);
  border-radius: 14px;
  padding: 26px 28px;
}
.pub-card + .pub-card { margin-top: 16px; }
.pub-icon {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.pub-icon svg { width: 22px; height: 22px; stroke: currentColor; }
.pub-card h3 { margin: 2px 0 6px; font-size: 1.08rem; }
.pub-meta { color: var(--ink-soft); font-size: 0.88rem; margin: 0 0 8px; }
.pub-card a { font-size: 0.88rem; }

/* ---------- TEAM ---------- */
.team-photo { margin: 0 0 40px; }
.team-photo img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 16px 40px rgba(26, 34, 48, 0.12);
}

.team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px 32px;
}
.team-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.team-list strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 620;
}
.team-list span {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 1px;
}

/* ---------- PARTNERS ---------- */
.partners {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.partner {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px 26px;
  background: var(--paper);
}
.partner strong { display: block; font-size: 0.98rem; margin-bottom: 6px; }
.partner span { display: block; color: var(--ink-soft); font-size: 0.86rem; line-height: 1.55; }

/* ---------- CONTACT ---------- */
#contact { padding-bottom: 88px; }
.contact-box {
  text-align: center;
  padding: 64px 32px;
  background: linear-gradient(180deg, #1e2a3d 0%, #24334a 100%);
  border-radius: 20px;
}
.contact-box h2 { color: #fff; margin: 0 0 12px; font-size: 1.8rem; }
.contact-lede { color: #b7c2d4; max-width: 52ch; margin: 0 auto 30px; }
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 8px;
  background: #fff;
  color: var(--accent-deep);
  font-weight: 650;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

/* ---------- FOOTER ---------- */
footer {
  padding: 36px 0 52px;
  text-align: center;
  color: #9aa3af;
  font-size: 0.82rem;
  line-height: 1.8;
}
footer a { color: #9aa3af; }
footer a:hover { color: var(--accent); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 920px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
  .hero-media { order: -1; }
  .hero-media img { max-height: 280px; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .features { grid-template-columns: 1fr; }
  .impact-grid { grid-template-columns: 1fr; }
  .impact-grid img { height: auto; max-height: 340px; }
  .stat-row-3 { grid-template-columns: 1fr; }
  .charts { grid-template-columns: 1fr; }
  .team-list { grid-template-columns: 1fr 1fr; }
  .partners { grid-template-columns: 1fr; }

  .dg-flow { grid-template-columns: 1fr; gap: 14px; }
  .dg-arrow svg { transform: rotate(90deg); }
  .dg-steps { grid-template-columns: 1fr; gap: 10px; }
  .dg-mini-arrow svg { transform: rotate(90deg); }
}

@media (max-width: 600px) {
  section { padding: 56px 0; }
  .hero { padding: 56px 0 48px; }
  .nav-links { gap: 16px; font-size: 0.82rem; }
  .nav-links a:nth-child(1) { display: none; }
  .stat-row { grid-template-columns: 1fr; }
  .team-list { grid-template-columns: 1fr; }
  .pub-card { flex-direction: column; gap: 14px; }
}