/* ========================================================================
   layout.css — page scaffolding, nav, sections, grid
   ======================================================================== */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--sp-3);
}

/* ---------------------------------------------------------------- Nav -- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease);
}

.navbar.is-scrolled {
  background: var(--shell-bg);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom-color: var(--border);
}

.navbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.navbar__brand {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  font-size: 1.05rem;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.navbar__brand .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--sp-2);
}

.navbar__link {
  position: relative;
  padding: 8px 12px;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease);
}
.navbar__link:hover {
  color: var(--text);
  background: var(--hover);
}
.navbar__link.is-active {
  color: var(--text);
}
.navbar__link.is-active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
}

.navbar__status {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  font-size: var(--fs-xs);
  color: var(--success);
  background: var(--success-soft);
  border: 1px solid rgba(92, 203, 127, 0.28);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.navbar__toggle {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
}

/* ------------------------------------------------------------ Sections -- */
.section {
  padding-block: var(--sp-12);
}
.section--tight {
  padding-block: var(--sp-8);
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-6);
}
.section__head--spaced { margin-top: var(--sp-8); }
.section__title {
  font-size: var(--fs-h2);
}
.section__lead {
  color: var(--text-muted);
  max-width: 52ch;
  margin-top: 10px;
}

/* ---------------------------------------------------------------- Grid -- */
.grid {
  display: grid;
  gap: var(--sp-3);
}
.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--auto {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

/* ---------------------------------------------------------------- Foot -- */
.footer {
  border-top: 1px solid var(--border);
  padding-block: var(--sp-6);
  margin-top: var(--sp-8);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

/* ------------------------------------------------------------ Responsive -- */
@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .navbar__links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 0;
    padding: var(--sp-2);
    background: var(--shell-bg-solid);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  }
  .navbar__links.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .navbar__status { display: none; }
  .navbar__toggle { display: inline-flex; }
  .navbar__link.is-active::after { display: none; }
  .navbar__link.is-active { background: var(--primary-soft); }
}

@media (max-width: 760px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
  .section { padding-block: var(--sp-8); }
  .section__head { flex-direction: column; align-items: flex-start; }
}