:root {
  --bg-deep: #0a0f1a;
  --bg-surface: #111827;
  --bg-card: #1a2235;
  --fg: #e8edf5;
  --fg-muted: #8b95a8;
  --accent: #f5a623;
  --accent-glow: rgba(245, 166, 35, 0.15);
  --accent-secondary: #ff6b6b;
  --border: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

body {
  background: var(--bg-deep);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  padding: 120px 24px 100px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 20px;
  padding: 6px 14px;
  background: var(--accent-glow);
  border-radius: 100px;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 24px;
}

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

.hero-lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.7;
}

/* Stack Preview */
.stack-preview {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stack-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  transition: transform 0.2s, border-color 0.2s;
}

.stack-card:hover {
  border-color: var(--accent);
  transform: translateX(-4px);
}

.stack-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 1rem;
}

.stack-1 .stack-icon { background: rgba(59, 130, 246, 0.15); color: #3b82f6; }
.stack-2 .stack-icon { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.stack-3 .stack-icon { background: rgba(168, 85, 247, 0.15); color: #a855f7; }
.stack-4 .stack-icon { background: var(--accent-glow); color: var(--accent); }

.stack-price {
  margin-left: auto;
  color: var(--fg-muted);
  font-size: 0.85rem;
}

/* ===== PROBLEM ===== */
.problem {
  padding: 100px 24px;
  background: var(--bg-surface);
}

.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
}

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

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

.problem-card {
  padding: 36px 28px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.problem-number {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.problem-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--fg);
}

.problem-card p {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ===== STACK SECTION ===== */
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 16px;
}

.stack-section {
  padding: 100px 24px;
  background: var(--bg-deep);
}

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

.stack-inner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 12px;
}

.stack-subtitle {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin-bottom: 60px;
}

.stack-layers {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.stack-layers::before {
  content: '';
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-secondary));
}

.layer {
  display: flex;
  gap: 28px;
  padding: 32px 0;
  position: relative;
}

.layer-marker {
  width: 46px;
  height: 46px;
  min-width: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  border-radius: 50%;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--accent);
  z-index: 1;
}

.layer-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.layer-content p {
  color: var(--fg-muted);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 12px;
}

.layer-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 12px;
  background: var(--accent-glow);
  border-radius: 100px;
}

/* ===== VERTICALS ===== */
.verticals {
  padding: 100px 24px;
  background: var(--bg-surface);
}

.verticals-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.verticals-inner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 12px;
}

.verticals-subtitle {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin-bottom: 60px;
  max-width: 640px;
}

.verticals-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.vertical-card {
  padding: 32px 24px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s;
}

.vertical-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.vertical-emoji {
  font-size: 2rem;
  margin-bottom: 16px;
}

.vertical-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.vertical-card p {
  font-size: 0.85rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ===== PHILOSOPHY ===== */
.philosophy {
  padding: 100px 24px;
  background: var(--bg-deep);
  position: relative;
}

.philosophy::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.philosophy-inner {
  max-width: 780px;
  margin: 0 auto;
}

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

.philosophy-content > p {
  color: var(--fg-muted);
  font-size: 1.02rem;
  line-height: 1.7;
  margin-bottom: 40px;
}

.philosophy-points {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.point-marker {
  width: 8px;
  height: 8px;
  min-width: 8px;
  background: var(--accent);
  border-radius: 50%;
  margin-top: 8px;
}

.point p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.point strong {
  color: var(--fg);
}

/* ===== CLOSING ===== */
.closing {
  padding: 120px 24px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-deep) 100%);
  position: relative;
}

.closing::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.closing h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.35;
  margin-bottom: 16px;
  color: var(--fg);
}

.closing-sub {
  font-size: 1.05rem;
  color: var(--fg-muted);
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-deep);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--fg-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .verticals-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 80px 20px 60px;
  }

  .verticals-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .layer {
    gap: 16px;
  }
}