/* ==========================================================================
   Layout - Header, Footer, Grid, Navigation
   ========================================================================== */

/* ---- Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: #FFD600;
  transition: background var(--transition-base), box-shadow var(--transition-base), height var(--transition-base);
}

.site-header--transparent {
  background: #FFD600;
}

.site-header--scrolled {
  background: #FFD600;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-md);
  height: var(--header-height-scrolled);
}

.site-header--scrolled .header__logo img {
  height: 36px;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.header__logo a {
  display: flex;
  align-items: center;
}

.header__logo img {
  height: 44px;
  width: auto;
  transition: height var(--transition-base);
}

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.site-header--transparent .nav__link {
  color: #1A1A2E;
}

.site-header--scrolled .nav__link {
  color: #1A1A2E;
}

.nav__link:hover,
.nav__link--active {
  background: rgba(0, 0, 0, 0.1);
  color: #0D47A1;
}

.site-header--transparent .nav__link:hover,
.site-header--transparent .nav__link--active {
  background: rgba(0, 0, 0, 0.1);
  color: #0D47A1;
}

.nav__link .nav__arrow {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.nav__item:hover .nav__arrow {
  transform: rotate(180deg);
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 100;
}

.nav__item:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-small);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav__dropdown-link:hover {
  background: rgba(21, 101, 192, 0.06);
  color: var(--color-primary);
}

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

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  background: rgba(0,0,0,0.06);
  border-radius: 20px;
  padding: 2px;
  font-size: var(--text-small);
  font-weight: 600;
}

.site-header--transparent .lang-switch {
  background: rgba(0,0,0,0.08);
}

.lang-switch__btn {
  padding: 4px 12px;
  border-radius: 18px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-small);
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  display: inline-block;
}

.site-header--transparent .lang-switch__btn {
  color: #1A1A2E;
}

.lang-switch__btn--active {
  background: var(--color-primary);
  color: #fff !important;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-header--transparent .hamburger span {
  background: #1A1A2E;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: var(--color-surface);
  z-index: 999;
  transition: right var(--transition-slow);
  overflow-y: auto;
  padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
}

.mobile-nav.open {
  right: 0;
}

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

.mobile-nav__link {
  display: block;
  padding: var(--space-md);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.mobile-nav__link:hover {
  background: rgba(21, 101, 192, 0.06);
  color: var(--color-primary);
}

.mobile-nav__sub {
  padding-left: var(--space-lg);
  display: none;
}

.mobile-nav__sub.open {
  display: block;
}

.mobile-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-md);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.mobile-nav__toggle:hover {
  background: rgba(21, 101, 192, 0.06);
}

.mobile-nav__toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.mobile-nav__toggle.open svg {
  transform: rotate(180deg);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.85);
  padding: var(--space-3xl) 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__col h3 {
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__col p {
  font-size: var(--text-small);
  line-height: 1.8;
}

.footer__col a {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-small);
  transition: color var(--transition-fast);
}

.footer__col a:hover {
  color: #fff;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__cert {
  margin-top: var(--space-lg);
}

.footer__cert img {
  height: 60px;
  width: auto;
  opacity: 0.9;
}

.footer__cert-badge {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 var(--space-md);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm, 4px);
  font-size: var(--text-small);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(255,255,255,0.9);
}

.footer__social {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.7);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.footer__social a:hover {
  background: var(--color-accent);
  color: #fff;
}

.footer__social svg {
  width: 20px;
  height: 20px;
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-lg) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__legal {
  display: flex;
  gap: var(--space-lg);
}

.footer__legal a {
  color: rgba(255,255,255,0.5);
  font-size: var(--text-small);
}

.footer__legal a:hover {
  color: #fff;
}

.footer__copyright {
  font-size: var(--text-small);
  color: rgba(255,255,255,0.5);
}

/* ---- Grid Utilities ---- */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.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-fit, minmax(300px, 1fr));
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .header__nav {
    display: none;
  }

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

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer__legal {
    justify-content: center;
    flex-wrap: wrap;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

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