/* ============================================================
   layout.css — container, nav, footer, sections, grid
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.section { padding: clamp(80px, 12vw, 156px) 0; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
.section__head { margin-bottom: 60px; max-width: 640px; }
.section__head h2 { margin-top: 14px; }
.section__lead { margin-top: 14px; font-size: 1.05rem; }

main { display: block; }

/* ---------- Navigation ---------- */
.nav__skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: #fff; padding: 10px 16px; z-index: 200;
  border-radius: 0 0 8px 0;
}
.nav__skip:focus { left: 0; }

.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0);
  border-bottom: 1px solid transparent;
  transition: background .35s var(--ease), border-color .35s var(--ease), backdrop-filter .35s;
}
.nav.is-scrolled {
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav__brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); }
.nav__mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--ink); color: #fff;
  font-family: var(--font-display); font-weight: 700; font-size: .9rem;
  letter-spacing: -.02em;
}
.nav__name { font-family: var(--font-display); font-weight: 600; color: var(--ink); }

.nav__menu { display: flex; align-items: center; gap: 30px; }
.nav__menu a[data-nav] {
  position: relative; color: var(--ink-soft); font-weight: 500; font-size: .95rem;
  padding: 4px 0; transition: color .2s var(--ease);
}
.nav__menu a[data-nav]::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 2px; background: var(--accent);
  transform: scaleX(0); transform-origin: left; transition: transform .28s var(--ease);
}
.nav__menu a[data-nav]:hover { color: var(--ink); }
.nav__menu a[data-nav]:hover::after,
.nav__menu a[data-nav].is-active::after { transform: scaleX(1); }
.nav__menu a[data-nav].is-active { color: var(--ink); }

.nav__toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--border);
  background: #fff; border-radius: 10px; cursor: pointer; position: relative;
}
.nav__toggle span, .nav__toggle span::before, .nav__toggle span::after {
  content: ""; position: absolute; left: 50%; width: 18px; height: 2px;
  background: var(--ink); border-radius: 2px; transform: translateX(-50%); transition: .3s var(--ease);
}
.nav__toggle span { top: 50%; transform: translate(-50%,-50%); }
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top:  6px; }
.nav__toggle[aria-expanded="true"] span { background: transparent; }
.nav__toggle[aria-expanded="true"] span::before { top: 0; transform: translateX(-50%) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span::after  { top: 0; transform: translateX(-50%) rotate(-45deg); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-alt); padding-top: 56px; }
.footer__inner {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 28px; flex-wrap: wrap; padding-bottom: 36px;
}
.footer__name { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.2rem; }
.footer__tag { font-size: .95rem; margin-top: 2px; }
.footer__links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer__links a { color: var(--ink-soft); font-weight: 500; transition: color .2s; }
.footer__links a:hover { color: var(--accent); }
.footer__base {
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding-block: 22px; border-top: 1px solid var(--border);
  font-size: .85rem; color: var(--ink-muted);
}

/* ---------- Generic grids ---------- */
.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 860px) {
  .nav__toggle { display: block; }
  .nav__menu {
    position: fixed; inset: 68px 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 6px;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 18px 24px 26px; box-shadow: var(--shadow-md);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: .3s var(--ease);
  }
  .nav__menu.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__menu a[data-nav] { width: 100%; padding: 10px 0; font-size: 1.05rem; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
}