/* ========== Container ========== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav.nav-scrolled {
  background: var(--bg-nav-scrolled);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.nav .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.nav-brand img {
  height: 40px;
  width: auto;
}

.nav-brand span {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-left: auto;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-base);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-cyan);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-lang {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: var(--space-lg);
  flex-shrink: 0;
}

.nav-lang button {
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-lang button:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.nav-lang button.active {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--bg-primary);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-base);
}

/* Mobile Nav */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
}

.nav-mobile-overlay a {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  font-weight: 600;
}

.nav-mobile-overlay a:hover,
.nav-mobile-overlay a.active {
  color: var(--accent-cyan);
}

body.nav-open .nav-mobile-overlay {
  display: flex;
}

body.nav-open .nav-hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

body.nav-open .nav-hamburger span:nth-child(2) {
  opacity: 0;
}

body.nav-open .nav-hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Main Content ========== */
main {
  padding-top: var(--nav-height);
}

/* ========== Section ========== */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-accent-line {
  width: 60px;
  height: 3px;
  background: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
  margin: var(--space-md) auto;
  border-radius: 2px;
}

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

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

/* ========== Footer ========== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-2xl) 0 var(--space-lg);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer-brand img {
  height: 32px;
}

.footer-brand span {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-heading);
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.footer h4 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
}

.footer-links a {
  display: block;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-lg);
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-xs);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-lang { margin-left: auto; }
  .nav-hamburger { display: flex; }

  .section { padding: var(--space-2xl) 0; }
  .section-header h2 { font-size: var(--font-size-2xl); }

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

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