/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition-fast), background-color var(--transition-fast),
    border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background-color: rgba(10, 14, 20, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

[data-theme='light'] .nav {
  background-color: rgba(247, 249, 251, 0.78);
}

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

.nav-brand {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--color-text-primary);
}

.nav-brand span {
  color: var(--color-accent);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-5);
}

.nav-link {
  position: relative;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  padding-block: var(--space-1);
}

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

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-text-primary);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-cta {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }

  .nav-cta {
    display: inline-flex;
  }
}

/* Botón toggle de tema */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon {
  display: block;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme='light'] .theme-toggle .icon-moon {
  display: none;
}

[data-theme='light'] .theme-toggle .icon-sun {
  display: block;
}

/* Botón hamburguesa (mobile) */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  margin-inline: auto;
}

.nav-toggle[aria-expanded='true'] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded='true'] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

/* Menú mobile (overlay) */
.nav-mobile-menu {
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  z-index: 40;
  background-color: var(--color-bg);
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

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

.nav-mobile-menu .nav-link {
  font-size: 1.25rem;
}

@media (min-width: 768px) {
  .nav-mobile-menu {
    display: none;
  }
}

/* Tags / badges de tecnología */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}