Portfolio/src/styles/layout.css

:root {
  --site-navigation-block-size: 53px;
}

.portfolio-shell {
  min-width: 0;
}

.site-header {
  min-block-size: 0;
}

.site-navigation {
  position: fixed;
  z-index: var(--z-navigation);
  inset: 0 0 auto;
  min-block-size: var(--site-navigation-block-size);
  border-block-end: 1px solid var(--line);
  background: var(--surface-strong);
}

.site-navigation__disclosure {
  max-inline-size: 96rem;
  margin-inline: auto;
}

.site-navigation summary {
  display: none;
}

.site-navigation ul {
  display: grid !important;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-auto-rows: 52px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-navigation a {
  display: inline-flex;
  inline-size: 100%;
  min-block-size: 44px;
  align-items: center;
  justify-content: center;
  padding-inline: 0.45rem;
  border-block-end: 2px solid transparent;
  color: var(--text-muted);
  font: 520 0.78rem/1 var(--mono);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition:
    color var(--transition),
    background-color var(--transition),
    border-color var(--transition);
}

.site-navigation a:hover,
.site-navigation a:focus-visible {
  background: rgb(120 216 229 / 8%);
  color: var(--text);
}

.site-navigation a[aria-current="page"] {
  border-block-end-color: var(--cyan);
  color: var(--cyan);
}

.site-navigation a:focus-visible {
  outline-offset: -3px;
}

.portfolio-main {
  min-width: 0;
  padding-block: var(--site-navigation-block-size) 18vh;
}

.hero-journey {
  display: grid;
  min-block-size: calc(100svh - var(--site-navigation-block-size));
  align-items: start;
  padding: clamp(3.5rem, 12vh, 8rem) 4vw 16vh;
  scroll-margin-block-start: var(--site-navigation-block-size);
}

.hero-journey__content {
  display: grid;
  inline-size: min(34rem, 39vw);
  gap: 1rem;
  padding: clamp(1.4rem, 2.2vw, 2.1rem);
  border: 1px solid var(--line);
  border-inline-start: 3px solid var(--cyan);
  border-inline-end: 0;
  border-radius: 3px 0 0 3px;
  background: linear-gradient(
    90deg,
    rgb(5 12 23 / 96%) 0 72%,
    rgb(5 12 23 / 74%) 88%,
    rgb(5 12 23 / 0%) 100%
  );
  box-shadow: -1.4rem 2rem 4rem rgb(0 5 15 / 24%);
}

.portfolio-section {
  position: relative;
  min-width: 0;
  margin-block: clamp(6rem, 16vh, 11rem);
  padding: clamp(1.5rem, 2.6vw, 2.7rem);
  scroll-margin-block-start: calc(
    var(--site-navigation-block-size) + var(--space-3)
  );
  border: var(--panel-border);
  border-radius: var(--radius-surface);
  background: var(--surface);
  box-shadow: var(--panel-shadow);
}

.portfolio-section[data-layout="right-rail"] {
  inline-size: 42%;
  margin-inline: 54% 4%;
}

.portfolio-section[data-layout="left-timeline"] {
  inline-size: 46%;
  margin-inline: 4% 50%;
}

.portfolio-section[data-layout="full-diagram"] {
  inline-size: 68%;
  margin-inline: 16%;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.portfolio-section[data-layout="project-stage"] {
  inline-size: 92%;
  margin-inline: 4%;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.portfolio-section[data-layout="project-stage"] > h2,
.portfolio-section[data-layout="project-stage"] > .section-eyebrow {
  inline-size: fit-content;
  padding: 0.55rem 0.8rem;
  border-inline-start: 2px solid var(--cyan);
  background: var(--surface-strong);
}

.portfolio-section[data-layout="compact-rail"] {
  inline-size: 42%;
  margin-inline: 54% 4%;
}

.portfolio-section[data-layout="toolkit-field"] {
  inline-size: 68%;
  margin-inline: 16%;
}

.portfolio-section[data-layout="destination"] {
  inline-size: min(42rem, 46%);
  margin-inline: 4% auto;
}

.portfolio-section footer {
  min-width: 0;
}

@media (min-width: 768px) and (max-width: 1279px) {
  .hero-journey {
    padding-inline: 4vw;
  }

  .hero-journey__content {
    inline-size: min(31rem, 58vw);
  }

  .portfolio-section[data-layout="right-rail"] {
    inline-size: 60%;
    margin-inline: 36% 4%;
  }

  .portfolio-section[data-layout="left-timeline"] {
    inline-size: 60%;
    margin-inline: 4% 36%;
  }

  .portfolio-section[data-layout="full-diagram"],
  .portfolio-section[data-layout="toolkit-field"] {
    inline-size: 84%;
    margin-inline: 8%;
  }

  .portfolio-section[data-layout="project-stage"] {
    inline-size: 92%;
    margin-inline: 4%;
  }

  .portfolio-section[data-layout="compact-rail"] {
    inline-size: 62%;
    margin-inline: 34% 4%;
  }

  .portfolio-section[data-layout="destination"] {
    inline-size: 70%;
  }
}

@media (max-width: 767px) {
  :root {
    --site-navigation-block-size: 53px;
  }

  .site-navigation__disclosure {
    position: relative;
  }

  .site-navigation summary {
    display: flex;
    min-block-size: 52px;
    align-items: center;
    justify-content: space-between;
    padding-inline: 1rem;
    color: var(--text);
    cursor: pointer;
    font: 560 0.76rem/1 var(--mono);
    letter-spacing: 0.08em;
    list-style: none;
  }

  .site-navigation summary::after {
    color: var(--cyan);
    content: "+";
    font-size: 1.1rem;
  }

  .site-navigation details[open] summary::after {
    content: "−";
  }

  .site-navigation summary::-webkit-details-marker {
    display: none;
  }

  .site-navigation summary:focus-visible {
    outline: none;
    box-shadow: inset 0 0 0 2px var(--focus);
  }

  .site-navigation ul {
    position: absolute;
    inset: 100% 0 auto;
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: 48px;
    border-block: 1px solid var(--line);
    background: var(--surface-strong);
    box-shadow: var(--panel-shadow);
  }

  .site-navigation details:not([open]) ul {
    display: none !important;
  }

  .portfolio-main {
    padding-block-end: 8rem;
  }

  .hero-journey {
    min-block-size: calc(100svh - var(--site-navigation-block-size));
    align-items: start;
    padding: clamp(2rem, 9vh, 4.5rem) 1rem 8rem;
  }

  .hero-journey__content {
    inline-size: 100%;
    gap: 0.9rem;
    padding: 1.25rem 1.15rem 1.35rem;
    background: linear-gradient(
      90deg,
      rgb(5 12 23 / 97%) 0 82%,
      rgb(5 12 23 / 58%) 94%,
      rgb(5 12 23 / 0%) 100%
    );
  }

  .portfolio-section,
  .portfolio-section[data-layout] {
    inline-size: calc(100% - 2rem);
    margin: 6rem 1rem;
    padding: 1.4rem;
    background: var(--surface-strong);
  }

  .portfolio-section[data-layout="project-stage"] {
    padding: 0;
    border: 0;
    background: transparent;
  }

  .portfolio-section[data-layout="project-stage"] > h2,
  .portfolio-section[data-layout="project-stage"] > .section-eyebrow {
    margin-inline-start: 0;
    background: var(--surface-strong);
  }

  .project-link,
  .contact-link,
  .contact-social-link {
    min-inline-size: 44px;
    min-block-size: 44px;
  }
}

@media (max-height: 420px) {
  .hero-journey {
    min-block-size: auto;
    padding-block: 4rem 3rem;
  }

  .portfolio-section,
  .portfolio-section[data-layout] {
    margin-block: 4rem;
  }
}