/* Skip navigation link (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 10000;
  background: var(--c-accent);
  color: #000;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 0;
  outline: 2px solid #000;
  outline-offset: 2px;
}

/* Screen-reader only utility (WCAG 1.3.1) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

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

.btn:active {
  transform: translateY(0);
}

/* Shimmer overlay on all buttons */
.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 35%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
}

.btn:hover::after {
  animation: shimmer 0.6s ease forwards;
}

.btn-accent {
  background: var(--c-accent);
  color: #0A0A0A;
  font-weight: 800;
  box-shadow: var(--glow-sm);
}

.btn-accent:hover {
  background: #d4ff1a;
  box-shadow: var(--glow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1.5px solid var(--c-card-border);
}

.btn-ghost:hover {
  border-color: rgba(200, 255, 0, 0.5);
  color: var(--c-accent);
  box-shadow: var(--glow-sm);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1rem;
  letter-spacing: 0.04em;
}

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

.card:hover {
  border-color: rgba(200, 255, 0, 0.3);
  box-shadow: var(--glow-sm);
  transform: translateY(-4px);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.badge-accent {
  background: rgba(200, 255, 0, 0.12);
  color: var(--c-accent);
  border: 1px solid rgba(200, 255, 0, 0.25);
}

.badge-success {
  background: rgba(0, 200, 81, 0.12);
  color: var(--c-success);
  border: 1px solid rgba(0, 200, 81, 0.25);
}

.badge-danger {
  background: rgba(255, 68, 68, 0.12);
  color: var(--c-danger);
  border: 1px solid rgba(255, 68, 68, 0.25);
}

.badge-muted {
  background: rgba(255, 255, 255, 0.05);
  color: var(--c-text-sec);
  border: 1px solid var(--c-card-border);
}

.badge-popular {
  background: var(--c-accent);
  color: #0A0A0A;
  font-size: 0.65rem;
  font-weight: 800;
}

/* Nav */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), background var(--transition-base);
}

#navbar.scrolled {
  background: rgba(10, 10, 10, 0.94);
  border-bottom-color: var(--c-card-border);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

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

.nav-logo-icon {
  width: 34px;
  height: 34px;
  position: relative;
  flex-shrink: 0;
}

/* Concentric circle CSS art */
.nav-logo-icon::before,
.nav-logo-icon::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid var(--c-accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.nav-logo-icon::before {
  width: 34px;
  height: 34px;
  opacity: 0.3;
}

.nav-logo-icon::after {
  width: 20px;
  height: 20px;
  opacity: 0.55;
}

.nav-logo-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: var(--glow-sm);
}

.nav-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

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

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

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text-sec);
  transition: color var(--transition-fast);
  position: relative;
  letter-spacing: 0.01em;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--c-accent);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

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

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  padding: 4px;
}

@media (min-width: 1024px) {
  .hamburger {
    display: none;
  }
}

.hamburger span {
  display: block;
  height: 1.5px;
  background: var(--c-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

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

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

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

/* Mobile menu overlay */
#mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 10, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

#mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

#mobile-menu a {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--c-text-sec);
  transition: color var(--transition-fast);
  letter-spacing: 0.05em;
}

#mobile-menu a:hover {
  color: var(--c-accent);
}

/* Feature icon — numbered instead of emoji */
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(200, 255, 0, 0.06);
  border: 1px solid rgba(200, 255, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover .feature-icon {
  background: rgba(200, 255, 0, 0.1);
  border-color: rgba(200, 255, 0, 0.3);
  box-shadow: var(--glow-sm);
}

/* Divider */
.divider {
  width: 40px;
  height: 2px;
  background: var(--c-accent);
  border-radius: var(--radius-full);
  box-shadow: var(--glow-sm);
}

/* Check list */
.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.check-list li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--c-text-sec);
}

.check-list li .check {
  color: var(--c-success);
  font-weight: 700;
  flex-shrink: 0;
}

.check-list li .dash {
  color: var(--c-text-muted);
  flex-shrink: 0;
}