@layer layout {
  /* ─── Scroll behaviour ─── */
  html {
    scroll-behavior: smooth;
    scroll-padding-block-start: 90px;
  }

  /* ─── Container ─── */
  .container {
    width: min(100% - 2 * var(--space-lg), var(--container));
    margin-inline: auto;
  }

  /* ─── N5 Floating pill site header with glassmorphism & progress bar ─── */
  .site-header {
    position: sticky;
    inset-block-start: var(--space-md);
    z-index: 100;
    width: min(100% - 2 * var(--space-md), var(--container));
    margin-inline: auto;
    pointer-events: none;
    animation: header-slide-down 0.6s var(--ease-out) forwards;
  }

  .site-nav {
    position: relative;
    pointer-events: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    padding: 12px 36px;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-secondary);
    border-radius: var(--radius-pill);
    box-shadow: 0 4px 24px rgba(19, 18, 16, 0.08);
    min-height: 60px;
    overflow: hidden;
  }

  .site-header__progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background-color: var(--color-tertiary);
    transition: width 100ms linear;
  }

  .site-nav__brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.02em;
  }

  .site-nav__list {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .site-nav__list::-webkit-scrollbar {
    display: none;
  }

  .site-nav__list > li {
    flex-shrink: 0;
  }

  .site-nav__link {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    text-decoration: none;
    white-space: nowrap;
    padding: 4px 8px;
    transition: color var(--duration-fast) var(--ease-out);
  }

  .site-nav__link:hover {
    color: var(--color-tertiary);
  }

  .site-nav__cta {
    flex-shrink: 0;
    white-space: nowrap;
    padding: 8px 22px;
    font-size: 0.95rem;
  }

  /* ─── Section rhythm ─── */
  .section {
    margin-block-start: clamp(4rem, 10vh, 7rem);
    padding-block-start: clamp(4rem, 10vh, 7rem);
    padding-block-end: clamp(5rem, 12vh, 8rem);
    width: min(100% - 2 * var(--space-lg), var(--container));
    margin-inline: auto;
    border-top: 1px solid rgba(113, 110, 104, 0.2);
    min-height: 85vh;
    scroll-margin-top: 4rem;
  }

  .section:first-of-type {
    margin-block-start: 0;
    padding-block-start: clamp(3rem, 7vh, 5rem);
  }

  .section__head {
    margin-block-end: var(--space-xl);
    display: grid;
    gap: var(--space-2xs);
  }

  .section__eyebrow {
    font-family: var(--font-mono);
    font-size: var(--text-label);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-2xs);
  }

  .section__num {
    color: var(--color-tertiary);
    font-weight: 700;
  }

  .section__title {
    font-family: var(--font-display);
    font-size: var(--text-h1);
    color: var(--color-primary);
    letter-spacing: var(--tracking-display);
  }

  /* ─── Hero — Single Column Clean Reference Layout ─── */
  .hero {
    width: min(100% - 2 * var(--space-lg), var(--container));
    margin-inline: auto;
    min-height: calc(88vh - 70px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding-block: clamp(4rem, 10vh, 7rem);
  }

  .hero__left {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
    max-width: 900px;
  }

  .hero__subtitle {
    font-family: var(--font-mono);
    font-size: clamp(0.7rem, 1.2vw, 0.8rem);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-block-start: var(--space-xs);
  }

  .hero__heading {
    font-family: var(--font-display);
    line-height: 1.05;
    letter-spacing: var(--tracking-display);
    color: var(--color-primary);
    margin-block: var(--space-xs);
  }

  .hero__greeting {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    color: var(--color-tertiary);
    font-weight: 700;
  }

  .hero__name {
    font-family: var(--font-display);
    font-size: clamp(3rem, 7vw, 5.25rem);
    font-weight: 800;
    color: var(--color-primary);
    display: block;
    margin-block: 4px;
  }

  .hero__aka {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3.25rem);
    font-weight: 400;
    color: var(--color-primary);
  }

  .hero__aka strong {
    font-weight: 800;
  }

  .hero__description {
    font-size: clamp(1.05rem, 1.6vw, 1.25rem);
    line-height: 1.6;
    color: var(--color-text-muted);
    max-inline-size: 50ch;
    margin-block-end: var(--space-sm);
  }

  .hero__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-md);
    margin-block-start: var(--space-xs);
  }

  /* ─── About Section Layout ─── */
  .about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: start;
  }

  /* ─── Stack Section Layout ─── */
  .stack-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: start;
  }

  .stack-left {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-width: 0;
  }

  /* ─── Breakpoints ─── */

  @media (min-width: 58em) {
    .site-footer {
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
    }
  }

  @media (min-width: 62em) {
    .about-grid {
      grid-template-columns: max-content 360px;
      gap: 12rem;
    }

    .stack-layout {
      grid-template-columns: minmax(0, 1fr) 370px;
      gap: clamp(1.5rem, 2.5vw, 2.5rem);
      align-items: start;
    }
  }

  @media (min-width: 75em) {
    .project-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }
}