/* Persistent ambient AI-graphics background, visible behind every section (not just the hero) */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding-left: var(--side-padding);
  padding-right: var(--side-padding);
}

/* ---------- Nav ---------- */
#site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 500;
  display: flex;
  align-items: center;
  background: transparent;
  transition: background var(--duration-base) var(--ease-standard),
    backdrop-filter var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard);
  border-bottom: 1px solid transparent;
}

#site-nav.is-scrolled {
  background: rgba(247, 247, 248, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--color-border);
}

.nav-inner {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--side-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-brand span {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: var(--space-5);
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  position: relative;
  padding: var(--space-1) 0;
}

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

.nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--color-accent-glow);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.4rem;
  cursor: pointer;
  padding: var(--space-2);
}

@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    right: 0;
    bottom: 0;
    width: min(320px, 80vw);
    background: rgba(11, 13, 18, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: var(--space-5);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-standard);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.is-open {
    transform: translateX(0);
  }

  .nav-links a {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: block;
  }
}

/* ---------- Section scaffolding ---------- */
.section {
  position: relative;
  padding: var(--space-9) 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-8);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-head p {
  margin-top: var(--space-3);
}

/* ---------- Hero ---------- */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.hero-panel {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  box-shadow: 0 24px 60px rgba(20, 22, 28, 0.1);
}

.hero-role {
  font-family: var(--font-mono);
  color: var(--color-accent-soft);
  font-size: 1rem;
  margin-bottom: var(--space-3);
}

.hero-tagline {
  font-size: 1.1rem;
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.hero-portrait-wrap {
  position: relative;
  justify-self: center;
}

.hero-portrait-wrap img {
  width: min(320px, 70vw);
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-strong);
  box-shadow: 0 0 60px var(--color-accent-glow);
}

.scroll-cue {
  position: absolute;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-tagline {
    margin-inline: auto;
  }

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

/* ---------- Grids ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
}

@media (max-width: 800px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Footer ---------- */
#site-footer {
  padding: var(--space-7) 0;
  text-align: center;
  color: var(--color-text-faint);
  font-size: var(--fs-small);
}

#site-footer .footer-social {
  display: flex;
  justify-content: center;
  gap: var(--space-5);
  margin-bottom: var(--space-4);
  font-size: 1.25rem;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  color: var(--color-text-muted);
}

/* section color rhythm: alternate elevated background for depth */
.section.alt {
  background: linear-gradient(
    180deg,
    transparent,
    rgba(20, 22, 28, 0.02) 20%,
    rgba(20, 22, 28, 0.02) 80%,
    transparent
  );
}