:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --fg-dim: #55556a;
  --accent: #6c5ce7;
  --accent-bright: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.15);
  --border: #22223a;
  --border-accent: #3a3a5c;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
}

/* ---- HERO ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 60px 80px;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(162, 155, 254, 0.05) 0%, transparent 50%),
    var(--bg);
}

.hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 80px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.75rem;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-bright);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  margin-bottom: 28px;
  background: var(--accent-glow);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  color: var(--fg);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero h1 .accent {
  color: var(--accent-bright);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.8;
}

.hero-cta {
  display: inline-block;
  margin-top: 36px;
  padding: 16px 32px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
}
.hero-cta:hover {
  background: var(--accent-bright);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(108, 92, 231, 0.35);
}

/* Arch diagram visual */
.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.arch-layer {
  padding: 20px 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all 0.3s ease;
}

.arch-layer:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.layer-1 {
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.12), transparent);
  border-color: var(--accent);
  color: var(--accent-bright);
}

.layer-2 {
  background: var(--bg-card);
  color: var(--fg);
  margin-left: 20px;
}

.layer-3 {
  background: var(--bg-card);
  color: var(--fg-muted);
  margin-left: 40px;
}

.layer-4 {
  background: var(--bg-elevated);
  color: var(--fg-dim);
  margin-left: 60px;
}

/* ---- PROBLEM ---- */
.problem {
  padding: 120px 60px;
  border-top: 1px solid var(--border);
}

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

.section-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-bright);
  margin-bottom: 20px;
}

.problem h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--fg);
  margin-bottom: 60px;
  max-width: 700px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  padding: 40px 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.problem-number {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--accent-bright);
  margin-bottom: 16px;
}

.problem-card p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---- APPROACH ---- */
.approach {
  padding: 120px 60px;
  background:
    radial-gradient(ellipse at 70% 50%, rgba(108, 92, 231, 0.06) 0%, transparent 50%),
    var(--bg);
  border-top: 1px solid var(--border);
}

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

.approach h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 20px;
}

.approach-desc {
  color: var(--fg-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 64px;
  line-height: 1.8;
}

.approach-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.step {
  padding: 32px 24px;
  border-left: 2px solid var(--border);
  transition: border-color 0.3s ease;
}

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

.step-num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-dim);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--fg);
}

.step p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ---- CAPABILITIES ---- */
.capabilities {
  padding: 120px 60px;
  border-top: 1px solid var(--border);
}

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

.capabilities h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 60px;
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.cap-item {
  padding: 40px 36px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  transition: all 0.3s ease;
}

.cap-item:hover {
  border-color: var(--border-accent);
  background: var(--bg-card);
}

.cap-icon {
  color: var(--accent-bright);
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.cap-item h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--fg);
}

.cap-item p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ---- CLOSING ---- */
.closing {
  padding: 140px 60px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 60%, rgba(108, 92, 231, 0.1) 0%, transparent 55%),
    var(--bg);
  border-top: 1px solid var(--border);
}

.closing-inner {
  max-width: 750px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 24px;
  line-height: 1.35;
}

.closing h2 em {
  font-style: italic;
  color: var(--accent-bright);
}

.closing-sub {
  color: var(--fg-muted);
  font-size: 1.1rem;
  line-height: 1.8;
}

/* ---- FOOTER ---- */
.site-footer {
  padding: 48px 60px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--fg);
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--fg-dim);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .hero { padding: 80px 24px 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .problem, .approach, .capabilities, .closing { padding: 80px 24px; }
  .problem-grid { grid-template-columns: 1fr; }
  .approach-steps { grid-template-columns: repeat(2, 1fr); }
  .cap-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .hero { padding: 60px 16px 40px; }
  .problem, .approach, .capabilities, .closing { padding: 60px 16px; }
  .approach-steps { grid-template-columns: 1fr; }
  .site-footer { padding: 32px 16px; }
}