/* ==========================================================================
   Site navigation
   Two behavior modes, set via [data-nav-behavior] on <nav class="site-nav">:
   - "reveal"        (home page): hidden over the hero, slides in once the
                       hero scrolls out of view, then stays pinned.
   - "hide-on-scroll" (case study pages): visible from the top, hides on
                       scroll-down, reveals on scroll-up.
   See scripts/nav.js for the behavior logic.
   ========================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-hairline);
  transform: translateY(-100%);
  transition: transform 0.25s ease;
}

.site-nav[data-nav-behavior="hide-on-scroll"] {
  transform: translateY(0);
}

.site-nav--visible {
  transform: translateY(0);
}

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

.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.site-nav-wordmark {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-nav-wordmark);
  letter-spacing: 0.06em;
  color: var(--color-nav-wordmark);
  text-decoration: none;
}

.site-nav-wordmark-short {
  display: none;
}

.site-nav-link-short {
  display: none;
}

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.site-nav-link {
  position: relative;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: var(--text-nav);
  color: var(--color-body);
  text-decoration: none;
  padding-bottom: 6px;
}

.site-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--color-underline);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.15s ease;
}

.site-nav-link:hover::after {
  transform: scaleX(1);
}

.site-nav-link.is-active::after {
  background: var(--color-underline-active);
  transform: scaleX(1);
}

/* ==========================================================================
   Responsive — Tablet (≤ 900px)
   ========================================================================== */

@media (max-width: 900px) {
  .site-nav-links {
    gap: 24px;
  }

  .site-nav-wordmark {
    font-size: 13px;
  }

  .site-nav-link {
    font-size: 14px;
  }
}

/* ==========================================================================
   Responsive — Mobile (≤ 600px)
   ========================================================================== */

@media (max-width: 600px) {
  .site-nav-links {
    gap: 16px;
  }

  .site-nav-wordmark {
    font-size: 12.5px;
  }

  .site-nav-wordmark-full {
    display: none;
  }

  .site-nav-wordmark-short {
    display: inline;
  }

  .site-nav-link {
    font-size: 13px;
  }

  .site-nav-link-full {
    display: none;
  }

  .site-nav-link-short {
    display: inline;
  }
}