/* ==========================================================================
   Layout Styles (Header, Footer, Navigation)
   ========================================================================== */

/* ── Header ─────────────────────────────────────────────── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background-color var(--transition-theme),
              border-color var(--transition-theme);
}

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

.header__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header__logo-text {
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── Desktop Navigation ──────────────────────────────────── */
.nav {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  text-decoration: none;
  position: relative;
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-accent-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-primary);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
  transform-origin: center;
}

.nav__link.is-active::after {
  transform: scaleX(1);
}

/* ── Header Actions ──────────────────────────────────────── */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header__action-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.header__action-btn:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-accent-primary);
}

.lang-toggle__label {
  font-size: var(--text-xs);
  font-weight: 600;
}

/* ── Hamburger Menu ──────────────────────────────────────── */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 24px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
}

.hamburger__line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
  transform-origin: 1px;
}

.header__hamburger[aria-expanded="true"] .hamburger__line:first-child {
  transform: rotate(45deg);
}

.header__hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
  transform: translateX(20px);
}

.header__hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: rotate(-45deg);
}

/* ── Mobile Navigation ───────────────────────────────────── */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background-color: var(--color-bg-primary);
  border-left: 1px solid var(--color-border);
  z-index: 95;
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transform: translateX(100%);
  transition: transform var(--transition-base), background-color var(--transition-theme);
  box-shadow: var(--shadow-lg);
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__link {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.is-active {
  color: var(--color-accent-primary);
}

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-primary);
  padding: var(--space-12) 0 var(--space-6);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

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

.footer__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.footer__description {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-accent-primary);
}

.footer__bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ── Main Content Offset ─────────────────────────────────── */
main {
  padding-top: var(--header-height);
  min-height: calc(100vh - var(--header-height) - var(--footer-height));
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 767px) {
  .nav {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }

  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}