/* ===================== HERO ===================== */
.hero {
  --nav-h: 68px;
  background: var(--bg-hero);
  border-bottom: 1px solid var(--border-subtle);
  border-top: none;
  min-height: calc(100svh - var(--nav-h));
  min-height: calc(100dvh - var(--nav-h));
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(300px, 1.1fr) minmax(240px, 0.9fr);
  gap: clamp(20px, 3vw, 48px);
  align-items: center;
  padding: clamp(48px, 8vw, 80px) 0;
  width: 100%;
}

.hero-content {
  max-width: 560px;
}

.hero h1 {
  line-height: 1.3;
  margin-top: 0;
  color: var(--text);
}

.hero-sub {
  margin-top: 24px;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-actions {
  margin-top: 32px;
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-visual-bg {
  display: none;
}

.mesh-graphic {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  min-width: 280px;

  /* Light mode — unchanged */
  --hero-math-bg: #eef2f7;
  --hero-math-inner: #f8fafc;
  --hero-math-stroke: #1a365d;
  --hero-math-text: #1a365d;
  --hero-ai-bg: #f3f0f7;
  --hero-ai-stroke: #4a3d6b;
  --hero-ai-text: #4a3d6b;
  --hero-ai-node: #4a3d6b;
  --hero-ai-node-soft: #6b5b95;
  --hero-network-opacity: 0.45;
  --hero-line-muted: #a1a1aa;
  --hero-hub-bg: #ffffff;
  --hero-hub-core: #1a365d;
  --hero-hub-label: #52525b;
}

[data-theme="dark"] .mesh-graphic {
  --hero-math-bg: #1a2535;
  --hero-math-inner: #232f42;
  --hero-math-stroke: #7cb3e8;
  --hero-math-text: #b8d4f0;
  --hero-ai-bg: #221e30;
  --hero-ai-stroke: #b09fd4;
  --hero-ai-text: #d4c8eb;
  --hero-ai-node: #9b8ec4;
  --hero-ai-node-soft: #7a6ba8;
  --hero-network-opacity: 0.65;
  --hero-line-muted: #52525b;
  --hero-hub-bg: #2a2a32;
  --hero-hub-core: #7cb3e8;
  --hero-hub-label: #d4d4d8;
}

[data-theme="dark"] .hero-panel-math,
[data-theme="dark"] .hero-panel-ai {
  opacity: 1;
}

[data-theme="dark"] .hero-node-ai-hub {
  opacity: 0.22;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 48px 0;
  }

  .hero-content {
    max-width: none;
    text-align: center;
    order: 1;
  }

  .hero-visual {
    order: 0;
  }

  .hero-actions {
    display: flex;
    justify-content: center;
  }

  .mesh-graphic {
    max-width: min(420px, 90vw);
  }
}

@media (max-width: 480px) {
  .mesh-graphic {
    max-width: 100%;
  }
}

/* ===================== CTA DARK — single accent block ===================== */
.cta-dark {
  background: var(--cta-bg);
  color: var(--cta-text);
  text-align: center;
  border-top: none;
}

.cta-dark h2 {
  color: var(--cta-text);
}

.cta-dark .cta-inner > p {
  color: var(--cta-muted);
}

.cta-dark .cta-details {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.cta-dark .cta-detail-label {
  color: var(--cta-muted);
}

.cta-dark .cta-detail span:not(.cta-detail-label) {
  color: #d8e0e8;
}

.cta-dark .cta-detail a {
  color: #a8c4e0;
}

.cta-dark .icon-box {
  background: rgba(255, 255, 255, 0.07);
  color: #a8c4e0;
}

.cta-dark .btn-primary {
  background: #ffffff;
  color: var(--cta-bg);
  border-color: #ffffff;
}

.cta-dark .btn-primary:hover {
  background: #eef1f5;
  border-color: #eef1f5;
}

/* ===================== SECTION OVERRIDES ===================== */
.section.on-soft .service-card,
.section.on-soft .project-card,
.section.on-soft .about-feature {
  background: var(--surface);
}