/* ==========================================================================
   Knowledge Pulp — Structural layout: container, header/nav, footer, grid
   ========================================================================== */

.container {
  max-width: var(--kp-page-max);
  margin: 0 auto;
  padding: 0 var(--kp-page-pad);
}

@media (max-width: 900px) {
  .container {
    padding: 0 var(--kp-page-pad-mobile);
  }
}

/* ---------- Site header / nav ---------- */
.site-header {
  background: var(--kp-surface-card);
  border-bottom: 1px solid var(--kp-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  max-width: var(--kp-page-max);
  margin: 0 auto;
  padding: 0 var(--kp-page-pad);
  display: flex;
  align-items: center;
  height: 68px;
  gap: 40px;
}

@media (max-width: 900px) {
  .site-header__inner {
    padding: 0 var(--kp-page-pad-mobile);
    gap: 16px;
  }
}

.logo {
  font-family: var(--kp-font-display);
  font-size: 22px;
  font-weight: 900;
  color: var(--kp-text-primary);
  letter-spacing: -.02em;
  flex: none;
  text-decoration: none;
}

.logo span {
  color: var(--kp-accent);
}

.main-nav {
  display: flex;
  gap: 28px;
  flex: 1;
  align-items: center;
}

.main-nav__link {
  font-size: 14px;
  text-decoration: none;
  font-weight: 500;
  color: #777;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.main-nav__link[aria-current="page"] {
  color: var(--kp-accent);
  font-weight: 700;
  border-bottom-color: var(--kp-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.nav-toggle {
  display: none;
  flex: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--kp-text-primary);
  position: relative;
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle__bar::before {
  content: '';
  position: absolute;
  top: -6px;
}

.nav-toggle__bar::after {
  content: '';
  position: absolute;
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--kp-surface-card);
    border-bottom: 1px solid var(--kp-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px var(--kp-page-pad-mobile) 24px;
    gap: 16px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .18s ease, transform .18s ease, visibility .18s;
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .header-actions .search-bar {
    display: none;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--kp-footer-bg);
  padding: 52px var(--kp-page-pad) 32px;
}

@media (max-width: 900px) {
  .site-footer {
    padding: 44px var(--kp-page-pad-mobile) 28px;
  }
}

.site-footer__grid {
  display: flex;
  gap: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--kp-footer-border);
  flex-wrap: wrap;
}

.site-footer__col {
  flex: 1;
  min-width: 160px;
}

.site-footer__col--brand {
  flex: 1.5;
  min-width: 220px;
}

.site-footer__col--updated {
  flex: 1.2;
  min-width: 220px;
}

.site-footer__logo {
  font-family: var(--kp-font-display);
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}

.site-footer__logo span {
  color: var(--kp-accent);
}

.site-footer__tagline {
  font-size: 13px;
  color: var(--kp-footer-text);
  line-height: 1.7;
  max-width: 260px;
}

.site-footer__heading {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--kp-footer-heading);
  margin-bottom: 16px;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.site-footer__links a {
  font-size: 13px;
  color: var(--kp-footer-text);
  text-decoration: none;
}

.site-footer__links a:hover,
.site-footer__links a[aria-current="page"] {
  color: var(--kp-accent);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer__copyright {
  font-size: 12px;
  color: var(--kp-footer-heading);
}

.site-footer__legal {
  display: flex;
  gap: 20px;
}

.site-footer__legal a {
  font-size: 12px;
  color: var(--kp-footer-heading);
  text-decoration: none;
}

.site-footer__legal a:hover {
  color: #777;
}

/* ---------- Section label (small caps + rule) ---------- */
.section-label-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--kp-text-faint);
  white-space: nowrap;
}

.section-label-row__rule {
  flex: 1;
  height: 1px;
  background: var(--kp-border);
}

.section-label-row__more {
  font-size: 12px;
  color: var(--kp-accent);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
}

/* ---------- Responsive grid helpers ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--kp-card-gap);
}

@media (max-width: 980px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
}