:root {
  --green: #10b981;
  --green-dark: #059669;
  --green-glow: rgba(16, 185, 129, 0.15);
  --purple: #8b5cf6;
  --purple-dark: #7c3aed;
  --purple-glow: rgba(139, 92, 246, 0.15);
  --bg: #070709;
  --bg-surface: #0d0d10;
  --bg-card: #111115;
  --border: #1c1c22;
  --border-light: #242430;
  --text: #f0eff5;
  --text-muted: #6b6b80;
  --text-subtle: #3a3a50;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── Typography ── */
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 600; line-height: 1.15; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 600; letter-spacing: -0.02em; }
h3 { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; }
p  { color: var(--text-muted); font-size: 1rem; line-height: 1.75; }

.gradient-text {
  background: linear-gradient(135deg, var(--green) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Nav ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 4rem;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
}

nav.scrolled {
  background: rgba(7, 7, 9, 0.85);
  border-color: var(--border);
  backdrop-filter: blur(12px);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text);
}

.nav-logo-text {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

.nav-cta {
  background: linear-gradient(135deg, var(--green), var(--purple));
  color: #fff !important;
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  transition: opacity 0.2s !important;
}

.nav-cta:hover { opacity: 0.85; }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 8rem 4rem 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 40%, rgba(139, 92, 246, 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 30% 60%, rgba(16, 185, 129, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 1.5rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 100px;
  background: rgba(16, 185, 129, 0.06);
}

.hero-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero > .hero-content > p {
  font-size: 1.1rem;
  max-width: 540px;
  margin-bottom: 2.5rem;
  color: var(--text-muted);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  background: linear-gradient(135deg, var(--green), var(--purple));
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: opacity 0.2s, transform 0.2s;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  background: transparent;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid var(--border-light);
  transition: color 0.2s, border-color 0.2s;
}

.btn-ghost:hover { color: var(--text); border-color: var(--text-subtle); }

.hero-visual {
  position: absolute;
  right: 4rem;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  opacity: 0.6;
}

/* ── Pillars strip ── */
.pillars-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 4rem;
  display: flex;
  gap: 3rem;
  overflow-x: auto;
  background: var(--bg-surface);
}

.pillar-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  white-space: nowrap;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pillar-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pillar-dot.green { background: var(--green); }
.pillar-dot.purple { background: var(--purple); }

/* ── Section base ── */
section { padding: 6rem 4rem; }

.section-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--purple);
  margin-bottom: 1rem;
}

.section-header {
  max-width: 600px;
  margin-bottom: 3.5rem;
}

.section-header p {
  margin-top: 1rem;
  font-size: 1.05rem;
}

/* ── About ── */
.about {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
  max-width: 1200px;
  margin: 0 auto;
}

.about-left h2 { margin-bottom: 1.5rem; }
.about-left p { margin-bottom: 1rem; font-size: 1rem; }

.about-right {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-stat {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.about-stat:hover { border-color: var(--border-light); }

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── Capabilities ── */
.capabilities { max-width: 1200px; margin: 0 auto; }

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cap-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.25s, transform 0.25s;
  position: relative;
  overflow: hidden;
}

.cap-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--purple));
  opacity: 0;
  transition: opacity 0.25s;
}

.cap-card:hover { border-color: var(--border-light); transform: translateY(-3px); }
.cap-card:hover::before { opacity: 1; }

.cap-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.2rem;
}

.cap-icon.green { background: rgba(16, 185, 129, 0.1); }
.cap-icon.purple { background: rgba(139, 92, 246, 0.1); }

.cap-card h3 { margin-bottom: 0.6rem; font-size: 1rem; }
.cap-card p { font-size: 0.88rem; line-height: 1.65; }

/* ── Philosophy ── */
.philosophy {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.philosophy-inner {
  max-width: 800px;
  margin: 0 auto;
}

.philosophy-quote {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 2rem;
}

.philosophy-attribution {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.divider-line {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--green), var(--purple));
  margin: 0 auto 2.5rem;
}

/* ── Footer ── */
footer {
  padding: 3rem 4rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--text); }

/* ── Research Page ── */
.page-hero {
  padding: 10rem 4rem 5rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 80% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero-content { max-width: 700px; position: relative; }
.page-hero h1 { margin-bottom: 1.25rem; }
.page-hero p { font-size: 1.1rem; }

.research-areas { max-width: 1200px; margin: 0 auto; }

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.research-card {
  padding: 2.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.25s, transform 0.25s;
  position: relative;
  overflow: hidden;
}

.research-card:hover { border-color: var(--border-light); transform: translateY(-2px); }

.research-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  border-radius: 12px 0 0 12px;
}

.research-card-accent.green { background: var(--green); }
.research-card-accent.purple { background: var(--purple); }
.research-card-accent.gradient { background: linear-gradient(180deg, var(--green), var(--purple)); }

.research-card-inner { padding-left: 1rem; }

.research-number {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-subtle);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.research-card h3 { font-size: 1.05rem; margin-bottom: 0.75rem; }
.research-card p { font-size: 0.88rem; line-height: 1.7; }

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  border-radius: 100px;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
}

.tag.green { border-color: rgba(16, 185, 129, 0.3); color: var(--green); background: rgba(16, 185, 129, 0.06); }
.tag.purple { border-color: rgba(139, 92, 246, 0.3); color: var(--purple); background: rgba(139, 92, 246, 0.06); }

/* ── Methodology section ── */
.methodology {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.methodology-inner { max-width: 1200px; margin: 0 auto; }

.methodology-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.method-step {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.method-step:hover { border-color: var(--border-light); }

.method-number {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  margin-bottom: 0.75rem;
}

.method-step h3 { font-size: 0.95rem; margin-bottom: 0.6rem; }
.method-step p { font-size: 0.83rem; }

/* ── Vision banner ── */
.vision-banner {
  padding: 6rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.vision-banner-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 30% 50%, rgba(16, 185, 129, 0.05) 0%, transparent 70%),
    radial-gradient(ellipse 60% 60% at 70% 50%, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.vision-banner-inner { max-width: 700px; margin: 0 auto; position: relative; }
.vision-banner h2 { margin-bottom: 1.25rem; }
.vision-banner p { font-size: 1.05rem; margin-bottom: 2rem; }

/* ── Fade-in animation ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Canvas chart ── */
#hero-canvas {
  width: 100%;
  height: 100%;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
  .research-grid { grid-template-columns: 1fr; }
  .methodology-steps { grid-template-columns: repeat(2, 1fr); }
  .hero-visual { display: none; }
}

@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  section { padding: 4rem 1.5rem; }
  .hero { padding: 7rem 1.5rem 4rem; }
  .pillars-strip { padding: 1.25rem 1.5rem; }
  .capabilities-grid { grid-template-columns: 1fr; }
  .methodology-steps { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 1.5rem; text-align: center; }
  .page-hero { padding: 8rem 1.5rem 4rem; }
}