/* =============================================================
   boards.solutions — Layout
   Header, footer, containers, section scaffolding, grid systems.
   Mobile-first: base styles target smallest screens.
   ============================================================= */

/* ============================================================
   Container System
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container--narrow {
  max-width: var(--container-md);
}

.container--wide {
  max-width: var(--container-2xl);
}


/* ============================================================
   Section Base
   ============================================================ */
.section {
  padding-block: var(--space-16);
}

.section--sm {
  padding-block: var(--space-12);
}

.section--lg {
  padding-block: var(--space-24);
}

.section-header {
  margin-bottom: var(--space-12);
}

.section-header--centered {
  text-align: center;
  max-width: 56ch;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.section-eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-brand-primary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.section-subline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-top: var(--space-4);
}


/* ============================================================
   Site Header
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface-base);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base),
              background var(--transition-base);
}

.site-header.header--scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border-default);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 64px;
  padding-inline: var(--space-5);
  max-width: var(--container-xl);
  margin-inline: auto;
}

/* Logo */
.nav__brand {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  margin-right: auto;
}

.nav__brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text-primary);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.nav__logo-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  line-height: 1;
}

.nav__logo-text .logo-accent {
  color: var(--color-brand-primary);
}

/* Desktop nav links — hidden on mobile */
.nav__links {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-1);
  align-items: center;
}

.nav__links a {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
  white-space: nowrap;
}

.nav__links a:hover,
.nav__links li.is-active a {
  color: var(--color-text-primary);
  background: var(--color-surface-subtle);
}

.nav__links a[aria-current="page"] {
  color: var(--color-brand-primary);
  font-weight: var(--font-weight-semibold);
}

/* Header action buttons — hidden on mobile */
.header__actions {
  display: none;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Hamburger toggle — visible on mobile */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  flex-shrink: 0;
  padding: 0;
}

.nav-toggle:hover {
  background: var(--color-surface-subtle);
}

.nav-toggle__icon {
  width: 22px;
  height: 22px;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.nav-toggle__icon--close {
  position: absolute;
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon--open {
  opacity: 0;
  transform: rotate(90deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon--close {
  opacity: 1;
  position: static;
  transform: rotate(0);
}

/* Body offset for fixed header */
body {
  padding-top: 64px;
}


/* ============================================================
   Mobile Menu — Full-screen overlay
   ============================================================ */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--color-surface-base);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transform: translateX(100%);
  transition: opacity var(--transition-base), transform var(--transition-base);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-5);
  min-height: 100%;
}

.mobile-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  margin-bottom: var(--space-6);
}

.mobile-menu__brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.mobile-menu__brand .logo-accent {
  color: var(--color-brand-primary);
}

.mobile-menu__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: var(--color-surface-subtle);
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.mobile-menu__close:hover {
  background: var(--color-border-default);
}

.mobile-menu__close svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.mobile-menu__links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}

.mobile-menu__links a {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-4);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast), color var(--transition-fast);
  min-height: 56px;
}

.mobile-menu__links a:hover {
  background: var(--color-surface-subtle);
  color: var(--color-brand-primary);
}

.mobile-menu__links a[aria-current="page"] {
  color: var(--color-brand-primary);
  font-weight: var(--font-weight-semibold);
  background: var(--color-brand-light);
}

.mobile-menu__ctas {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-default);
}


/* ============================================================
   Site Footer
   ============================================================ */
.site-footer {
  background: var(--color-slate-900);
  color: var(--color-text-inverse);
  padding-block: var(--space-16) var(--space-8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text-inverse);
}

.footer__logo-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
}

.footer__logo-text .logo-accent {
  color: var(--color-blue-500);
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-slate-400);
  line-height: var(--line-height-relaxed);
  max-width: 28ch;
}

.footer__nav-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.footer__col-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-inverse);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.footer__col-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__col-links a {
  font-size: var(--font-size-sm);
  color: var(--color-slate-400);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.footer__col-links a:hover {
  color: var(--color-text-inverse);
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--color-slate-400);
  line-height: var(--line-height-relaxed);
}

.footer__copyright a {
  color: var(--color-blue-500);
  text-decoration: none;
}

.footer__copyright a:hover {
  color: var(--color-text-inverse);
}


/* ============================================================
   Grid Utilities (used across sections)
   ============================================================ */

/* Auto-fit grid: 1 col → 2 col → 3 col via minmax */
.grid-auto {
  display: grid;
  gap: var(--space-6);
}

/* Explicit column grids */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}