/* ==========================================================================
   04 — LAYOUT
   ==========================================================================
   The page shell: content width, sticky navigation, section rhythm, footer.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Content container. Everything sits inside one of these.
   -------------------------------------------------------------------------- */
.wrap {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 var(--wrap-pad);
}

/* --------------------------------------------------------------------------
   Section rhythm

   scroll-margin-top is what makes anchor links land correctly: without it,
   clicking "~/skills" would scroll the heading underneath the sticky nav.
   -------------------------------------------------------------------------- */
/* Sections deliberately cancel the horizontal padding they inherit from
   `.wrap`, so terminal windows span the full --wrap-max content width and sit
   slightly wider than the hero text column. On wide screens the max-width
   centring still leaves a generous gutter, so nothing touches the edges.

   Below --wrap-max there is no centring gutter left to rely on, and content
   WOULD run edge-to-edge. css/06-responsive.css restores the padding there.

   Vertical values use padding-top/padding-bottom rather than the `padding`
   shorthand, so this horizontal intent stays explicit instead of being an
   invisible side effect. */
.section {
  padding-top: 40px;
  padding-bottom: 20px;
  padding-left: 0;
  padding-right: 0;
  scroll-margin-top: calc(var(--nav-h) + 18px);
}
#top { scroll-margin-top: 0; }

.strip-section {
  padding-top: 4px;
  padding-bottom: 26px;
  padding-left: 0;
  padding-right: 0;
}

/* ==========================================================================
   NAVIGATION
   ==========================================================================
   Sticky, translucent, blurred. Desktop shows all links inline; below the
   mobile breakpoint (06-responsive.css) they collapse behind the hamburger.
   ========================================================================== */
nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line2);
}

/* Fallback for browsers without color-mix(): use a solid background so the
   nav never renders fully transparent over scrolling content. */
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  nav { background: var(--bg); }
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px var(--wrap-pad);
  max-width: var(--wrap-max);
  margin: 0 auto;
}

.nav-logo {
  font-weight: 700;
  color: var(--ink);
  flex: none;
}
.nav-logo:hover { color: var(--ink); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: clamp(11px, 2.4vw, 24px);
  flex-wrap: wrap;
}

.nav-links {
  display: flex;
  gap: clamp(11px, 2.4vw, 24px);
  font-size: 13px;
  color: var(--dim2);
  flex-wrap: wrap;
  align-items: center;
}
.nav-links a {
  color: inherit;
  position: relative;
  padding: 4px 0;
  transition: color var(--speed-fast) ease;
}
.nav-links a:hover { color: var(--green2); }

/* ---- Active link ---------------------------------------------------------
   js/nav.js adds .is-active to exactly one link as you scroll, driven by an
   IntersectionObserver. The underline slides in from the left.
   -------------------------------------------------------------------------- */
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1.5px;
  width: 100%;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--speed) var(--ease);
}
.nav-links a.is-active { color: var(--green); }
.nav-links a.is-active::after { transform: scaleX(1); }

.nav-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex: none;
}

/* ---- Hamburger -----------------------------------------------------------
   Hidden on desktop. Shown and wired up in 06-responsive.css.
   -------------------------------------------------------------------------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: var(--tap-min);
  height: var(--tap-min);
  padding: 0;
  background: var(--chipbg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex: none;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 0 auto;
  background: var(--green);
  transition: transform var(--speed) var(--ease), opacity var(--speed-fast) ease;
}

/* Bars morph into an X while the menu is open. */
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
footer {
  border-top: 1px solid var(--line2);
  margin-top: 20px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 24px;
  padding-bottom: 60px;
}

.footer-copy {
  font-size: 12px;
  color: var(--dim);
}

.footer-links {
  display: flex;
  gap: 20px;
  font-size: 12.5px;
  flex-wrap: wrap;
}
.footer-links a { color: var(--dim2); }
.footer-links a:hover { color: var(--green); }