/* ============================================
   Layout — Grid, sections, responsive, nav
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-base);
  overflow-x: hidden;
}

/* Blueprint grid hidden on desktop — city canvas is the background.
   Show grid only on mobile where canvas is hidden. */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: var(--z-canvas);
  display: none;
}

@media (max-width: 1023px) {
  body::before {
    display: block;
  }

  .city-canvas {
    display: none;
  }
}

/* --- Skip link (accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent);
  color: var(--color-base);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border-radius: var(--border-radius);
  z-index: var(--z-toast);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-smooth);
}

.skip-link:focus {
  top: var(--space-4);
}

/* --- Sections --- */
.section {
  position: relative;
  z-index: var(--z-content);
  padding: var(--space-section) var(--space-6);
}

.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: var(--content-narrow);
}

.section__title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-2xl);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-8);
}

.section__subtitle {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  text-transform: lowercase;
  margin-bottom: var(--space-3);
}

/* --- Persistent city canvas (fullscreen fixed background) --- */
.city-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-canvas);
}

/* --- Flight sections (transparent overlays over the city) --- */
.flight-section {
  position: relative;
  z-index: var(--z-flight);
}

.flight-section--intro {
  width: 100%;
  height: 100vh;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Content sections get semi-transparent card-style backgrounds */
.flight-section.section {
  background: rgba(8, 12, 20, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(0, 229, 208, 0.08);
  border-bottom: 1px solid rgba(0, 229, 208, 0.08);
}

/* --- Intro content --- */
.intro__content {
  text-align: center;
  z-index: var(--z-content);
}

.intro__name {
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: 0.15em;
  line-height: 1;
  margin-bottom: var(--space-3);
}

.intro__handle {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.intro__title {
  font-family: var(--font-body);
  font-size: var(--text-2xl);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tunnel-skip {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  z-index: var(--z-skip);
  transition: color var(--duration-normal) var(--ease-smooth);
}

.tunnel-skip:hover {
  color: var(--color-accent);
}

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  background: rgba(8, 12, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-card);
  z-index: var(--z-nav);
  transition: transform var(--duration-normal) var(--ease-smooth);
}

.nav--hidden {
  transform: translateY(-100%);
}

.nav__name {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  background: linear-gradient(135deg, var(--color-chrome-mid), var(--color-chrome-light), var(--color-chrome-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  text-decoration: none;
}

.nav__handle {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  cursor: pointer;
  text-decoration: none;
}

/* --- Section dot indicator --- */
.section-dots {
  position: fixed;
  right: var(--space-5);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: var(--z-dots);
}

.section-dots__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-dim);
  border: none;
  cursor: pointer;
  transition: background var(--duration-normal) var(--ease-smooth),
              transform var(--duration-normal) var(--ease-smooth);
  padding: 0;
}

.section-dots__dot--active {
  background: var(--color-accent);
  transform: scale(1.4);
}

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

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

/* --- Hero layout --- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-8);
  padding-top: calc(var(--nav-height) + var(--space-10));
  min-height: 80vh;
  justify-content: center;
}

.hero__photo {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: var(--border-hairline);
}

.hero__statement {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  max-width: 800px;
}

.hero__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-5);
}

/* --- Responsive --- */

/* Tablet (640px+) */
@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero__photo {
    width: 320px;
    height: 320px;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero {
    flex-direction: row;
    text-align: left;
    gap: var(--space-10);
  }

  .hero__photo {
    width: 380px;
    height: 380px;
    flex-shrink: 0;
  }
}

/* Wide (1440px+) */
@media (min-width: 1440px) {
  .section {
    padding-left: var(--space-10);
    padding-right: var(--space-10);
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Hide section dots on mobile --- */
@media (max-width: 1023px) {
  .section-dots {
    display: none;
  }
}