/* ============================================================
   layout.css — Header, nav, footer, responsive grid
   Mobile-first: base → 768px → 1200px
   ============================================================ */

/* ---- Site header / nav ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 68px;
  display: flex;
  align-items: center;
  transition: background var(--transition-slow), box-shadow var(--transition-slow);
  background: transparent;
}

.site-header.is-solid,
.site-header--solid {
  background: rgba(22, 13, 56, 0.92);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
  box-shadow: var(--shadow-nav);
}

/* Inner pages always start solid */
.site-header--solid {
  background: var(--color-surface-dark) !important;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 100%;
}

/* ---- Logo lockup: badge + wordmark echoing the logo (CIO / Club Bulgaria) ---- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__img {
  height: 42px;
  width: 42px;
  border-radius: 5px;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  color: var(--color-text-on-dark);
}

.site-logo__main {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.14em;
}

.site-logo__sub {
  font-family: var(--font-logo);
  font-weight: 400;
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
  color: var(--color-text-on-dark);
}

.site-logo__sub b {
  font-weight: 700;
  color: var(--color-accent);
}

/* ---- Primary nav ---- */
.primary-nav {
  display: none;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.primary-nav__item a {
  position: relative;
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-on-dark-2);
  transition: color var(--transition);
  white-space: nowrap;
}

/* Gradient underline that grows in from the left */
.primary-nav__item a::after {
  content: '';
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: 2px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--gradient-rule);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.primary-nav__item a:hover,
.primary-nav__item a.is-active {
  color: var(--color-text-on-dark);
}

.primary-nav__item a:hover::after,
.primary-nav__item a.is-active::after {
  transform: scaleX(1);
}

.primary-nav__item a.is-active {
  font-weight: 600;
}

/* ---- Header right: lang + hamburger ---- */
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---- Language switcher ---- */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(203, 213, 225, 0.08);
  border: 1px solid rgba(203, 213, 225, 0.14);
  border-radius: var(--radius-full);
  padding: 2px;
}

.lang-switcher__btn {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text-on-dark-2);
  padding: 3px 9px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

.lang-switcher__btn:hover {
  color: var(--color-text-on-dark);
}

.lang-switcher__btn.is-active {
  background: var(--color-accent);
  color: var(--brand-deep-blue);
}

/* ---- Mobile hamburger ---- */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--color-text-on-dark);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition), width var(--transition);
  width: 100%;
}

.nav-toggle__bar:nth-child(2) { width: 70%; background: var(--color-accent); }

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  width: 0;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Mobile menu drawer ---- */
.mobile-menu {
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--color-surface-dark);
  border-top: 1px solid var(--color-border-dark);
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition-slow);
}

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

.mobile-menu__list {
  padding: var(--space-4) 0;
}

.mobile-menu__item a {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--color-text-on-dark-2);
  transition: color var(--transition), padding-left var(--transition), border-color var(--transition);
  border-left: 3px solid transparent;
}

.mobile-menu__item a:hover,
.mobile-menu__item a.is-active {
  color: var(--color-text-on-dark);
  padding-left: calc(var(--space-5) + 6px);
  border-left-color: var(--color-accent);
}

.mobile-menu__lang {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border-dark);
  display: flex;
  gap: var(--space-3);
}

/* ---- Site footer ----
   Tech-gradient band on top echoes the letterhead footer strip. */
.site-footer {
  color: var(--color-text-on-dark);
  padding: var(--space-16) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-tech);
}

.site-footer::after {
  content: '';
  position: absolute;
  right: -60px;
  bottom: -30px;
  width: 420px;
  height: 240px;
  background: var(--texture-pixels) no-repeat right bottom / contain;
  opacity: 0.35;
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  position: relative;
  z-index: 1;
}

/* Brand rule: keep clear space around the logo, no shadows or effects */
.footer-brand__logo {
  height: 72px;
  width: 72px;
  border-radius: 7px;
  margin-bottom: var(--space-6);
}

.footer-brand__desc {
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-2);
  opacity: 0.8;
  line-height: 1.75;
  max-width: 320px;
}

.footer-col__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-nav__list a {
  font-size: var(--text-sm);
  color: var(--color-text-on-dark-2);
  transition: color var(--transition);
}

.footer-nav__list a:hover {
  color: var(--color-text-on-dark);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.footer-social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: rgba(203, 213, 225, 0.08);
  color: var(--color-text-on-dark-2);
  transition: color var(--transition), background var(--transition);
}

.footer-social__link:hover {
  color: var(--color-text-on-dark);
  background: var(--gradient-tech);
}

.footer-social__link svg {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-8);
  margin-top: var(--space-10);
  border-top: 1px solid var(--color-border-dark);
  position: relative;
  z-index: 1;
}

.footer-copyright,
.footer-legal-link {
  font-size: var(--text-xs);
  color: var(--color-text-on-dark-2);
  opacity: 0.6;
}

.footer-legal-link {
  transition: opacity var(--transition);
}

.footer-legal-link:hover {
  opacity: 1;
}

@media (min-width: 768px) {
  .primary-nav { display: flex; align-items: center; }
  .nav-toggle  { display: none; }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-12);
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .footer-grid {
    grid-template-columns: 2.5fr 1fr 1fr 1fr;
  }
}

/* ---- Main content offset for fixed header ---- */
.main-content {
  padding-top: 68px;
}

.main-content--no-offset {
  padding-top: 0;
}

/* ---- Section spacing ---- */
.section {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-20) 0;
}

/* Background comes from the shared .atmosphere-dark rule in main.css */
.section--dark {
  color: var(--color-text-on-dark);
}

.section--alt {
  background: var(--color-surface-alt);
}

/* ---- Two-column grid ---- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

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

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

@media (min-width: 768px) {
  .section     { padding: var(--space-20) 0; }
  .section--lg { padding: var(--space-24) 0; }

  .grid-2 {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

@media (min-width: 1200px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---- Auto-fill card grid ---- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

/* ---- Asymmetric 60/40 split ---- */
.split-60-40 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.split-40-60 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .split-60-40 {
    grid-template-columns: 3fr 2fr;
    gap: var(--space-12);
    align-items: center;
  }

  .split-40-60 {
    grid-template-columns: 2fr 3fr;
    gap: var(--space-12);
    align-items: center;
  }
}