:root {
  color-scheme: light dark;

  --brand: oklch(65% 0.19 230);
  --brand-hover: oklch(60% 0.21 230);

  --bg-primary: light-dark(oklch(97% 0.005 85), oklch(14% 0.015 260));
  --bg-secondary: light-dark(oklch(100% 0 0), oklch(18% 0.018 260));
  --bg-tertiary: light-dark(oklch(93% 0.008 85), oklch(23% 0.022 260));
  --bg-card: light-dark(oklch(99% 0.003 85), oklch(17% 0.018 260));
  --bg-card-hover: light-dark(oklch(96% 0.008 85), oklch(21% 0.022 260));

  --border-subtle: light-dark(oklch(88% 0.008 85), oklch(28% 0.02 260));
  --border-strong: light-dark(oklch(75% 0.015 85), oklch(40% 0.025 260));
  --border-glow: oklch(72% 0.17 220);

  --text-primary: light-dark(oklch(18% 0.02 260), oklch(96% 0.005 260));
  --text-secondary: light-dark(oklch(40% 0.02 260), oklch(78% 0.015 260));
  --text-muted: light-dark(oklch(55% 0.015 260), oklch(62% 0.012 260));

  --accent-cyan: oklch(72% 0.16 215);
  --accent-blue: oklch(62% 0.19 255);
  --accent-amber: oklch(76% 0.17 80);
  --accent-rose: oklch(64% 0.22 15);
  --accent-emerald: oklch(70% 0.18 145);
  --accent-purple: oklch(68% 0.21 310);

  --grid-dot: light-dark(oklch(85% 0.008 85 / 0.6), oklch(30% 0.02 260 / 0.5));

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.825rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.6rem, 1.4rem + 1vw, 2.125rem);
  --text-3xl: clamp(2rem, 1.7rem + 1.6vw, 3rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-hud: 0 0 16px oklch(72% 0.16 215 / 0.2);
  --shadow-card: 0 4px 18px rgba(0, 0, 0, 0.35);

  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 24px 24px;
  background-attachment: fixed;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--accent-cyan);
  color: oklch(10% 0.02 260);
  font-weight: 800;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-6);
  z-index: 10000;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-smooth);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 3px solid var(--text-primary);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
}

button, a, input, select {
  transition: 
    background-color var(--duration-fast) var(--ease-smooth),
    border-color var(--duration-fast) var(--ease-smooth),
    color var(--duration-fast) var(--ease-smooth),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-spring);
}

button:active {
  transform: scale(0.98);
}

.hud-header {
  background: color-mix(in oklch, var(--bg-primary) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.header-inner {
  max-width: 1560px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo-branding {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-svg {
  width: 24px;
  height: 24px;
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 6px color-mix(in oklch, var(--accent-cyan) 40%, transparent));
  flex-shrink: 0;
}

.app-title-wrap {
  display: flex;
  flex-direction: column;
}

.app-title {
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.app-subtitle {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 1px;
}

.hud-nav-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  background: color-mix(in oklch, var(--bg-primary) 60%, black);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.nav-tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 8px 16px;
  min-height: 44px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.nav-tab-btn:hover {
  color: var(--text-primary);
  background: color-mix(in oklch, var(--bg-tertiary) 60%, transparent);
}

.nav-tab-btn.active {
  color: #fff;
  background: color-mix(in oklch, var(--brand) 30%, var(--bg-secondary));
  border: 1px solid var(--accent-cyan);
  box-shadow: 0 0 10px color-mix(in oklch, var(--accent-cyan) 30%, transparent);
}

.tab-svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
}

.app-main-content {
  flex: 1;
  max-width: 1560px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6);
}

.tab-pane {
  animation: paneFadeIn var(--duration-normal) var(--ease-smooth);
}

@keyframes paneFadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}