/* Sdílené: reset, design tokeny, navigace, patička */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: hsl(0 0% 5%);
  --bg-card: hsl(0 0% 7%);
  --bg-charcoal: hsl(0 0% 4%);
  --fg: hsl(0 0% 98%);
  --muted: hsl(0 0% 65%);
  --border: hsl(0 0% 18%);
  --secondary: hsl(0 0% 12%);
  --card: hsl(0 0% 8%);
  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'Inter', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background 0.5s, border-color 0.5s, backdrop-filter 0.5s;
  border-bottom: 1px solid transparent;
}

nav.scrolled {
  background: hsla(0, 0%, 5%, 0.95);
  backdrop-filter: blur(12px);
  border-color: var(--border);
}

.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 48px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.08em;
  color: var(--fg);
  text-decoration: none;
  transition: color 0.3s;
}

.nav-logo:hover {
  color: var(--muted);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.3s;
}

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

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--fg);
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  transition: all 0.3s;
}

.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: hsla(0, 0%, 5%, 0.98);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 24px 48px;
  flex-direction: column;
  gap: 16px;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

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

.nav-mobile a {
  font-family: var(--font-body);
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 0;
  transition: color 0.3s;
  border-bottom: 1px solid var(--border);
}

.nav-mobile a:hover {
  color: var(--fg);
}

footer {
  background: var(--bg-charcoal);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 48px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.08em;
  color: var(--fg);
  text-decoration: none;
}

.footer-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.3s;
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--muted);
}

@media (max-width: 768px) {
  .nav-inner {
    padding: 0 24px;
  }

  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-mobile {
    display: flex;
    padding: 24px;
  }

  .footer-inner {
    justify-content: center;
    text-align: center;
    padding: 0 24px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px 18px;
  }
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
  }
}