/* ===== Layout ===== */

/* --- Navigation --- */
.top-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 2rem;
  background: rgba(10,14,23,.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.top-nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.5); }
.nav-brand {
  font-size: 1.1rem; font-weight: 700; color: var(--accent);
  display: flex; align-items: center; gap: .5rem;
}
.nav-brand svg { width: 26px; height: 26px; }
.nav-links {
  display: flex; gap: .25rem; list-style: none;
  overflow-x: auto; max-width: 70vw;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  padding: .4rem .85rem; border-radius: var(--radius-sm);
  font-size: .8rem; font-weight: 500; color: var(--text-secondary);
  white-space: nowrap; transition: all var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent); background: var(--accent-glow);
}

/* mobile hamburger */
.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); cursor: pointer; font-size: 1.4rem; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; top: 56px; left: 0; right: 0;
    flex-direction: column; background: var(--bg-secondary);
    padding: 1rem; gap: .25rem;
    transform: translateY(-120%); transition: transform .35s ease;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: .6rem 1rem; font-size: .95rem; }
}

/* --- Sections --- */
.section {
  min-height: 100vh;
  padding: 6rem 2rem 4rem;
  position: relative;
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

/* --- Hero --- */
.hero {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; min-height: 100vh;
  padding-top: 4rem;
  position: relative; overflow: hidden;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}
.hero .subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary); max-width: 600px;
  margin-bottom: 2rem;
}
.hero-canvas {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  z-index: -1; opacity: .35;
}

/* --- Section headers --- */
.section-header {
  text-align: center; margin-bottom: 3rem;
}
.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: .6rem;
}
.section-header .tagline {
  color: var(--text-secondary); font-size: 1.05rem;
}
.section-number {
  display: inline-block; font-size: .75rem; font-weight: 700;
  color: var(--accent); letter-spacing: 2px; text-transform: uppercase;
  margin-bottom: .5rem;
}

/* --- Cards grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}