/* =========================================================
   LAYOUT.CSS — Container, grid, header, footer, nav
   ========================================================= */

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

.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }
.section--dark { background: var(--dark); color: var(--dark-ink); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--dark-ink); }
.section--alt { background: var(--surface); }

.grid { display: grid; gap: clamp(1rem, 2vw, 2rem); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

@media (max-width: 960px) {
  .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  padding: 1.1rem 0;
  transition: background var(--t-med) var(--ease),
              padding var(--t-med) var(--ease),
              box-shadow var(--t-med) var(--ease);
}
.site-header.is-scrolled {
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  padding: 0.65rem 0;
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .65rem;
  font-family: var(--font-display);
  font-size: 1.35rem; color: var(--ink); letter-spacing: -0.01em;
}
.brand__mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--ink); color: var(--bg);
  display: grid; place-items: center;
  font-weight: 600; font-family: var(--font-sans); font-size: .95rem;
}

.nav { display: flex; align-items: center; gap: 2rem; }
.nav__list { display: flex; gap: 1.75rem; align-items: center; }
.nav__link {
  position: relative;
  font-size: 0.95rem; font-weight: 500; color: var(--ink-soft);
  transition: color var(--t-fast) var(--ease);
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 100%; height: 1.5px; background: var(--accent);
  transform: scaleX(0); transform-origin: right;
  transition: transform var(--t-med) var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: var(--ink); }
.nav__link:hover::after, .nav__link.is-active::after {
  transform: scaleX(1); transform-origin: left;
}

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border-radius: 8px;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--ink); position: relative;
  transition: transform var(--t-fast) var(--ease), background var(--t-fast);
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 22px; height: 2px; background: var(--ink);
  transition: transform var(--t-med) var(--ease), top var(--t-fast);
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after  { top:  7px; }

body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
body.nav-open .nav-toggle span::after  { top: 0; transform: rotate(-45deg); }
body.nav-open { overflow: hidden; }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: fixed; inset: 0; z-index: 40;
    background: var(--bg);
    flex-direction: column; justify-content: center; align-items: center;
    gap: 0;
    transform: translateX(100%);
    transition: transform var(--t-med) var(--ease);
  }
  .nav__list {
    flex-direction: column; gap: 1.5rem;
    text-align: center;
  }
  .nav__link { font-family: var(--font-display); font-size: 2rem; color: var(--ink); }
  .nav .btn { margin-top: 1.25rem; }
  body.nav-open .nav { transform: translateX(0); }
  body.nav-open .nav__list li {
    animation: navStagger var(--t-med) var(--ease) both;
  }
  body.nav-open .nav__list li:nth-child(1) { animation-delay: .08s; }
  body.nav-open .nav__list li:nth-child(2) { animation-delay: .14s; }
  body.nav-open .nav__list li:nth-child(3) { animation-delay: .20s; }
  body.nav-open .nav__list li:nth-child(4) { animation-delay: .26s; }
  body.nav-open .nav__list li:nth-child(5) { animation-delay: .32s; }
  body.nav-open .nav__list li:nth-child(6) { animation-delay: .38s; }
}
@keyframes navStagger {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* spacer for fixed header */
.header-spacer { height: 80px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark);
  color: var(--dark-ink);
  padding: clamp(3rem, 6vw, 5rem) 0 1.5rem;
}
.site-footer h4 { color: var(--dark-ink); margin-bottom: 1rem; }
.site-footer a { color: rgba(250,248,245,.7); transition: color var(--t-fast); }
.site-footer a:hover { color: var(--accent); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid p { color: rgba(250,248,245,.6); font-size: .95rem; }
.footer-grid ul li { padding: .35rem 0; font-size: .95rem; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.5rem; gap: 1rem; flex-wrap: wrap;
  font-size: .85rem; color: rgba(250,248,245,.5);
}