/**
 * PHOBOS LAB - Master Stylesheet
 * A design system for space-age laboratory aesthetics
 * Version: 1.0.0
 *
 * Table of Contents:
 * 1. CSS Custom Properties (Variables)
 * 2. CSS Reset & Base Styles
 * 3. Typography
 * 4. Layout & Grid
 * 5. Navigation
 * 6. Buttons
 * 7. Forms & Inputs
 * 8. Cards
 * 9. Modals & Overlays
 * 10. Media Components
 * 11. Data Display (Tables, Lists)
 * 12. Authentication Components
 * 13. Notifications & Alerts
 * 14. Loading States
 * 15. Decorative Elements
 * 16. Animations & Keyframes
 * 17. Utility Classes
 * 18. Responsive Adjustments
 * 19. Dark/Light Mode (Future)
 * 20. Print Styles
 */

/* =============================================================================
   1. CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================================================= */

:root {
  /* -------------------------------------------------------------------------
     Color Palette
     ------------------------------------------------------------------------- */

  /* Primary Colors */
  --color-void-black: #0a0a0b;
  --color-lab-white: #f5f5f7;
  --color-moon-grey: #8b8b8d;

  /* Extended Neutrals */
  --color-regolith: #2a2a2c;
  --color-crater: #1a1a1c;
  --color-dust: #4a4a4c;
  --color-nebula: #3a3a3c;

  /* Accent Colors */
  --color-signal: #00d4aa;
  --color-signal-dim: #00a888;
  --color-alert: #ff6b6b;
  --color-alert-dim: #cc5555;
  --color-data: #4a9eff;
  --color-data-dim: #3a7ecc;
  --color-warning: #ffb347;

  /* Semantic Colors */
  --color-bg-primary: var(--color-void-black);
  --color-bg-secondary: var(--color-crater);
  --color-bg-elevated: var(--color-regolith);
  --color-text-primary: var(--color-lab-white);
  --color-text-secondary: var(--color-moon-grey);
  --color-text-muted: var(--color-dust);
  --color-border: var(--color-dust);
  --color-border-subtle: rgba(139, 139, 141, 0.2);

  /* -------------------------------------------------------------------------
     Typography
     ------------------------------------------------------------------------- */

  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --font-display: 'Space Grotesk', var(--font-primary);

  /* Font Sizes */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 2rem;       /* 32px */
  --text-4xl: 3rem;       /* 48px */
  --text-5xl: 4.5rem;     /* 72px */

  /* Font Weights */
  --weight-light: 300;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter Spacing */
  --tracking-tighter: -0.03em;
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.01em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* -------------------------------------------------------------------------
     Spacing
     ------------------------------------------------------------------------- */

  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.5rem;    /* 24px */
  --space-6: 2rem;      /* 32px */
  --space-7: 3rem;      /* 48px */
  --space-8: 4rem;      /* 64px */
  --space-9: 6rem;      /* 96px */
  --space-10: 8rem;     /* 128px */

  /* -------------------------------------------------------------------------
     Borders & Radius
     ------------------------------------------------------------------------- */

  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 9999px;

  --border-width: 1px;
  --border-width-2: 2px;

  /* -------------------------------------------------------------------------
     Shadows & Effects
     ------------------------------------------------------------------------- */

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  --shadow-glow-signal: 0 0 20px rgba(0, 212, 170, 0.3);
  --shadow-glow-data: 0 0 20px rgba(74, 158, 255, 0.3);
  --shadow-glow-alert: 0 0 20px rgba(255, 107, 107, 0.3);

  /* -------------------------------------------------------------------------
     Transitions & Animation
     ------------------------------------------------------------------------- */

  --duration-instant: 100ms;
  --duration-fast: 150ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --duration-slower: 500ms;

  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* -------------------------------------------------------------------------
     Z-Index Scale
     ------------------------------------------------------------------------- */

  --z-below: -1;
  --z-base: 0;
  --z-above: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;

  /* -------------------------------------------------------------------------
     Layout
     ------------------------------------------------------------------------- */

  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;
  --container-2xl: 1400px;

  --content-width: 680px;
  --sidebar-width: 280px;
  --nav-height: 64px;
  --nav-height-mobile: 56px;
}

/* =============================================================================
   2. CSS RESET & BASE STYLES
   ============================================================================= */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Selection */
::selection {
  background-color: var(--color-signal);
  color: var(--color-void-black);
}

/* Focus Styles */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-signal);
  outline-offset: 2px;
}

/* Links */
a {
  color: var(--color-data);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--color-lab-white);
}

/* Images */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Lists */
ul,
ol {
  list-style: none;
}

/* Tables */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Forms */
button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

/* Hidden */
[hidden] {
  display: none !important;
}

/* Screen Reader Only */
.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;
}

/* =============================================================================
   3. TYPOGRAPHY
   ============================================================================= */

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: var(--weight-normal);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.display {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: var(--weight-light);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-tighter);
}

h1, .h1 {
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h2, .h2 {
  font-size: var(--text-3xl);
  line-height: 1.2;
  letter-spacing: var(--tracking-tight);
}

h3, .h3 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
}

h4, .h4 {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  line-height: 1.4;
  letter-spacing: var(--tracking-wide);
}

h5, .h5 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

h6, .h6 {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

/* Paragraphs */
p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.small {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.micro {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
}

/* Text Modifiers */
.text-muted {
  color: var(--color-text-muted);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-signal {
  color: var(--color-signal);
}

.text-alert {
  color: var(--color-alert);
}

.text-data {
  color: var(--color-data);
}

/* Code */
code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
}

code {
  font-size: 0.875em;
  background-color: var(--color-crater);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
  color: var(--color-signal);
}

pre {
  background-color: var(--color-crater);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  border: 1px solid var(--color-border-subtle);
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Blockquote */
blockquote {
  border-left: 2px solid var(--color-signal);
  padding-left: var(--space-5);
  margin: var(--space-6) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* Horizontal Rule */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-dust) 20%,
    var(--color-dust) 80%,
    transparent 100%
  );
  margin: var(--space-7) 0;
}

/* Mark */
mark {
  background-color: var(--color-signal);
  color: var(--color-void-black);
  padding: 0 0.25em;
}

/* =============================================================================
   4. LAYOUT & GRID
   ============================================================================= */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container--sm { max-width: var(--container-sm); }
.container--md { max-width: var(--container-md); }
.container--lg { max-width: var(--container-lg); }
.container--xl { max-width: var(--container-xl); }
.container--2xl { max-width: var(--container-2xl); }
.container--content { max-width: var(--content-width); }
.container--full { max-width: none; }

/* Page Layout */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page__header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.page__main {
  flex: 1;
  padding-top: var(--space-7);
  padding-bottom: var(--space-9);
}

.page__footer {
  margin-top: auto;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid--cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid--cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid--cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid--cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid--cols-6 { grid-template-columns: repeat(6, 1fr); }
.grid--cols-12 { grid-template-columns: repeat(12, 1fr); }

/* Auto-fit Grid */
.grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--auto-sm {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid--auto-lg {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* Flex Utilities */
.flex {
  display: flex;
}

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

.flex--wrap {
  flex-wrap: wrap;
}

.flex--col {
  flex-direction: column;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

.flex--between {
  justify-content: space-between;
}

.flex--start {
  align-items: flex-start;
}

.flex--end {
  align-items: flex-end;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

/* Section Spacing */
.section {
  padding-top: var(--space-9);
  padding-bottom: var(--space-9);
}

.section--sm {
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}

.section--lg {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: var(--z-above);
  max-width: 800px;
}

.hero__title {
  margin-bottom: var(--space-5);
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-7);
}

.hero__background {
  position: absolute;
  inset: 0;
  z-index: var(--z-below);
}

/* =============================================================================
   5. NAVIGATION
   ============================================================================= */

/* Main Navigation */
.nav {
  height: var(--nav-height);
  background-color: rgba(10, 10, 11, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
}

.nav__container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.nav__logo:hover {
  opacity: 0.8;
  color: var(--color-text-primary);
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-moon-grey), var(--color-dust));
  position: relative;
}

.nav__logo-icon::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--color-crater);
  border-radius: var(--radius-full);
  top: 8px;
  left: 6px;
}

/* Nav Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
}

.nav__link--active::after,
.nav__link:hover::after {
  transform: scaleX(1);
}

/* Nav Actions */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
}

.nav__toggle-icon {
  width: 20px;
  height: 2px;
  background-color: currentColor;
  position: relative;
  transition: background-color var(--duration-fast);
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: currentColor;
  left: 0;
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__toggle-icon::before {
  top: -6px;
}

.nav__toggle-icon::after {
  top: 6px;
}

/* Mobile Menu */
.nav__mobile {
  position: fixed;
  top: var(--nav-height);
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 320px;
  background-color: var(--color-bg-primary);
  border-left: 1px solid var(--color-border-subtle);
  padding: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  z-index: var(--z-fixed);
  overflow-y: auto;
}

.nav__mobile--open {
  transform: translateX(0);
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav__mobile-link {
  display: block;
  padding: var(--space-4);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav__mobile-link:hover,
.nav__mobile-link--active {
  color: var(--color-text-primary);
  background-color: var(--color-crater);
}

/* Sidebar Navigation */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background-color: var(--color-crater);
  border-right: 1px solid var(--color-border-subtle);
  padding: var(--space-5);
  overflow-y: auto;
  z-index: var(--z-fixed);
}

.sidebar__header {
  padding-bottom: var(--space-5);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: all var(--duration-fast) var(--ease-out);
}

.sidebar__link:hover {
  color: var(--color-text-primary);
  background-color: var(--color-regolith);
}

.sidebar__link--active {
  color: var(--color-text-primary);
  background-color: var(--color-regolith);
}

.sidebar__link--active::before {
  content: '';
  width: 3px;
  height: 20px;
  background-color: var(--color-signal);
  border-radius: var(--radius-full);
  margin-left: calc(var(--space-4) * -1 + 2px);
  margin-right: calc(var(--space-3) - 5px);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.breadcrumbs__item {
  color: var(--color-text-secondary);
}

.breadcrumbs__link {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.breadcrumbs__link:hover {
  color: var(--color-text-primary);
}

.breadcrumbs__separator {
  color: var(--color-dust);
}

.breadcrumbs__current {
  color: var(--color-text-primary);
}

/* =============================================================================
   6. BUTTONS
   ============================================================================= */

/* Base Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  user-select: none;
}

.btn:disabled,
.btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Sizes */
.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn--lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

.btn--xl {
  padding: var(--space-5) var(--space-7);
  font-size: var(--text-lg);
}

/* Primary Button (Outlined) */
.btn--primary {
  background-color: transparent;
  border-color: var(--color-lab-white);
  color: var(--color-lab-white);
}

.btn--primary:hover {
  background-color: var(--color-lab-white);
  color: var(--color-void-black);
}

/* Secondary Button */
.btn--secondary {
  background-color: var(--color-regolith);
  border-color: var(--color-regolith);
  color: var(--color-lab-white);
}

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

/* Ghost Button */
.btn--ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  color: var(--color-text-primary);
  background-color: var(--color-crater);
}

/* Signal Button (CTA) */
.btn--signal {
  background-color: var(--color-signal);
  border-color: var(--color-signal);
  color: var(--color-void-black);
}

.btn--signal:hover {
  background-color: var(--color-signal-dim);
  border-color: var(--color-signal-dim);
}

/* Alert Button */
.btn--alert {
  background-color: transparent;
  border-color: var(--color-alert);
  color: var(--color-alert);
}

.btn--alert:hover {
  background-color: var(--color-alert);
  color: var(--color-void-black);
}

/* Data Button */
.btn--data {
  background-color: transparent;
  border-color: var(--color-data);
  color: var(--color-data);
}

.btn--data:hover {
  background-color: var(--color-data);
  color: var(--color-void-black);
}

/* Full Width Button */
.btn--full {
  width: 100%;
}

/* Icon Button */
.btn--icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn--icon.btn--sm {
  width: 32px;
  height: 32px;
}

.btn--icon.btn--lg {
  width: 48px;
  height: 48px;
}

/* Button Group */
.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
}

.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.btn-group .btn + .btn {
  margin-left: -1px;
}

/* =============================================================================
   7. FORMS & INPUTS
   ============================================================================= */

/* Form Layout */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form__row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* Labels */
.label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}

.label--required::after {
  content: ' *';
  color: var(--color-alert);
}

/* Base Input */
.input {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-crater);
  border: 1px solid var(--color-dust);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.input::placeholder {
  color: var(--color-moon-grey);
  opacity: 0.6;
}

.input:hover {
  border-color: var(--color-moon-grey);
}

.input:focus {
  border-color: var(--color-moon-grey);
  box-shadow: 0 0 0 3px rgba(139, 139, 141, 0.15);
  outline: none;
}

/* Input States */
.input--error {
  border-color: var(--color-alert);
}

.input--error:focus {
  border-color: var(--color-alert);
  box-shadow: var(--shadow-glow-alert);
}

.input--success {
  border-color: var(--color-signal);
}

.input--success:focus {
  border-color: var(--color-signal);
  box-shadow: var(--shadow-glow-signal);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-regolith);
}

/* Input Sizes */
.input--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
}

.input--lg {
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-lg);
}

/* Textarea */
textarea.input {
  min-height: 120px;
  resize: vertical;
}

/* Select */
.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238b8b8d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-8);
  cursor: pointer;
}

/* Checkbox & Radio */
.checkbox,
.radio {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.checkbox__input,
.radio__input {
  appearance: none;
  width: 18px;
  height: 18px;
  background-color: var(--color-crater);
  border: 1px solid var(--color-dust);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.checkbox__input {
  border-radius: var(--radius-sm);
}

.radio__input {
  border-radius: var(--radius-full);
}

.checkbox__input:checked,
.radio__input:checked {
  background-color: var(--color-signal);
  border-color: var(--color-signal);
}

.checkbox__input:checked {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%230a0a0b' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.radio__input:checked {
  background-image: url("data:image/svg+xml,%3Ccircle xmlns='http://www.w3.org/2000/svg' cx='6' cy='6' r='3' fill='%230a0a0b'/%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.checkbox__input:focus-visible,
.radio__input:focus-visible {
  outline: 2px solid var(--color-signal);
  outline-offset: 2px;
}

/* Toggle Switch */
.toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
}

.toggle__input {
  appearance: none;
  width: 44px;
  height: 24px;
  background-color: var(--color-dust);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  transition: background-color var(--duration-normal) var(--ease-out);
}

.toggle__input::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background-color: var(--color-lab-white);
  border-radius: var(--radius-full);
  top: 3px;
  left: 3px;
  transition: transform var(--duration-normal) var(--ease-spring);
}

.toggle__input:checked {
  background-color: var(--color-signal);
}

.toggle__input:checked::before {
  transform: translateX(20px);
}

/* Input with Icon */
.input-icon {
  position: relative;
}

.input-icon .input {
  padding-left: var(--space-8);
}

.input-icon__icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-moon-grey);
  pointer-events: none;
}

.input-icon--right .input {
  padding-left: var(--space-4);
  padding-right: var(--space-8);
}

.input-icon--right .input-icon__icon {
  left: auto;
  right: var(--space-3);
}

/* Help Text */
.help-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.help-text--error {
  color: var(--color-alert);
}

.help-text--success {
  color: var(--color-signal);
}

/* =============================================================================
   8. CARDS
   ============================================================================= */

/* Base Card */
.card {
  background-color: var(--color-regolith);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: 0 0 0 1px var(--color-border-subtle);
}

.card--bordered {
  border: 1px solid var(--color-border-subtle);
}

.card--bordered:hover {
  border-color: var(--color-dust);
  box-shadow: none;
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Card Sections */
.card__header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.card__body {
  padding: var(--space-5);
}

.card__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border-subtle);
  background-color: var(--color-crater);
}

/* Card Content */
.card__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-2);
}

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

.card__text {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* Card Image */
.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--color-crater);
}

.card__image--square {
  aspect-ratio: 1;
}

.card__image--wide {
  aspect-ratio: 21 / 9;
}

/* Card Meta */
.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* Card Actions */
.card__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Feature Card */
.card--feature {
  text-align: center;
  padding: var(--space-7);
}

.card--feature .card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-5);
  color: var(--color-signal);
}

/* Stat Card */
.card--stat {
  padding: var(--space-5);
}

.card--stat .card__value {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-light);
  margin-bottom: var(--space-2);
}

.card--stat .card__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* =============================================================================
   9. MODALS & OVERLAYS
   ============================================================================= */

/* Backdrop */
.backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.backdrop--visible {
  opacity: 1;
  visibility: visible;
}

/* Modal */
.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  width: 100%;
  max-width: 500px;
  max-height: calc(100vh - var(--space-8));
  background-color: var(--color-regolith);
  border: 1px solid var(--color-dust);
  border-radius: var(--radius-xl);
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-slow) var(--ease-out);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal--visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal--sm { max-width: 400px; }
.modal--lg { max-width: 700px; }
.modal--xl { max-width: 900px; }
.modal--full { max-width: calc(100vw - var(--space-8)); }

/* Modal Sections */
.modal__header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  margin: 0;
}

.modal__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.modal__close:hover {
  color: var(--color-text-primary);
  background-color: var(--color-crater);
}

.modal__body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  background-color: var(--color-crater);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* Drawer */
.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 400px;
  background-color: var(--color-bg-primary);
  border-left: 1px solid var(--color-border-subtle);
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
}

.drawer--visible {
  transform: translateX(0);
}

.drawer--left {
  right: auto;
  left: 0;
  border-left: none;
  border-right: 1px solid var(--color-border-subtle);
  transform: translateX(-100%);
}

.drawer--left.drawer--visible {
  transform: translateX(0);
}

/* =============================================================================
   10. MEDIA COMPONENTS
   ============================================================================= */

/* Image Container */
.image {
  position: relative;
  overflow: hidden;
  background-color: var(--color-crater);
  border-radius: var(--radius-lg);
}

.image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image--bordered {
  border: 1px solid var(--color-border-subtle);
}

/* Image Caption */
.image__caption {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-crater);
}

/* Video Player */
.video {
  position: relative;
  background-color: var(--color-void-black);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video__controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-4);
  background: linear-gradient(transparent, rgba(10, 10, 11, 0.8));
  display: flex;
  align-items: center;
  gap: var(--space-4);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.video:hover .video__controls {
  opacity: 1;
}

.video__progress {
  flex: 1;
  height: 4px;
  background-color: var(--color-dust);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.video__progress-bar {
  height: 100%;
  background-color: var(--color-signal);
  width: 0%;
  transition: width 100ms linear;
}

.video__time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

/* Play Button Overlay */
.video__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(10, 10, 11, 0.6);
  border: 2px solid var(--color-lab-white);
  border-radius: var(--radius-full);
  color: var(--color-lab-white);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.video__play:hover {
  background-color: var(--color-lab-white);
  color: var(--color-void-black);
  transform: translate(-50%, -50%) scale(1.1);
}

/* Audio Player */
.audio {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-regolith);
  border-radius: var(--radius-lg);
}

.audio__play {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-signal);
  border-radius: var(--radius-full);
  color: var(--color-void-black);
  flex-shrink: 0;
  transition: all var(--duration-fast) var(--ease-out);
}

.audio__play:hover {
  transform: scale(1.05);
}

.audio__info {
  flex: 1;
  min-width: 0;
}

.audio__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio__progress {
  margin-top: var(--space-2);
  height: 4px;
  background-color: var(--color-crater);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.audio__progress-bar {
  height: 100%;
  background-color: var(--color-signal);
}

.audio__time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

/* Gallery */
.gallery {
  display: grid;
  gap: var(--space-3);
}

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

.gallery__item {
  position: relative;
  aspect-ratio: 1;
  cursor: pointer;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.gallery__item:hover img {
  transform: scale(1.05);
}

/* Avatar */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--color-regolith);
  overflow: hidden;
  flex-shrink: 0;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar--sm { width: 32px; height: 32px; }
.avatar--lg { width: 56px; height: 56px; }
.avatar--xl { width: 80px; height: 80px; }

.avatar--bordered {
  border: 2px solid var(--color-signal);
}

/* Avatar Placeholder */
.avatar__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

/* =============================================================================
   11. DATA DISPLAY (TABLES, LISTS)
   ============================================================================= */

/* Table */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border-subtle);
}

.table th {
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-crater);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: var(--z-above);
}

.table tbody tr {
  transition: background-color var(--duration-fast) var(--ease-out);
}

.table tbody tr:hover {
  background-color: var(--color-crater);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* Table Modifiers */
.table--striped tbody tr:nth-child(even) {
  background-color: var(--color-crater);
}

.table--compact th,
.table--compact td {
  padding: var(--space-2) var(--space-3);
}

/* Data List */
.data-list {
  display: flex;
  flex-direction: column;
}

.data-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
}

.data-list__item:last-child {
  border-bottom: none;
}

.data-list__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.data-list__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* Key-Value Display */
.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.kv__key {
  color: var(--color-text-secondary);
}

.kv__value {
  font-family: var(--font-mono);
}

/* List */
.list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.list--bordered .list__item {
  padding: var(--space-4);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

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

.list__item--interactive {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.list__item--interactive:hover {
  background-color: var(--color-crater);
}

/* =============================================================================
   12. AUTHENTICATION COMPONENTS
   ============================================================================= */

/* Auth Container */
.auth {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  position: relative;
}

.auth__background {
  position: absolute;
  inset: 0;
  z-index: var(--z-below);
  overflow: hidden;
}

/* Auth Card */
.auth__card {
  width: 100%;
  max-width: 400px;
  background-color: var(--color-regolith);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  position: relative;
  z-index: var(--z-base);
}

.auth__header {
  text-align: center;
  margin-bottom: var(--space-7);
}

.auth__logo {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
}

.auth__title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-2);
}

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

.auth__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.auth__footer {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-subtle);
  text-align: center;
}

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

.auth__link a {
  color: var(--color-signal);
}

/* Divider with Text */
.auth__divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-5) 0;
}

.auth__divider::before,
.auth__divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border-subtle);
}

.auth__divider-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* Social Login Buttons */
.auth__social {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.auth__social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-crater);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  transition: all var(--duration-fast) var(--ease-out);
}

.auth__social-btn:hover {
  background-color: var(--color-dust);
  border-color: var(--color-dust);
}

/* =============================================================================
   13. NOTIFICATIONS & ALERTS
   ============================================================================= */

/* Alert */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.alert--info {
  background-color: rgba(74, 158, 255, 0.1);
  border-color: var(--color-data);
}

.alert--success {
  background-color: rgba(0, 212, 170, 0.1);
  border-color: var(--color-signal);
}

.alert--warning {
  background-color: rgba(255, 179, 71, 0.1);
  border-color: var(--color-warning);
}

.alert--error {
  background-color: rgba(255, 107, 107, 0.1);
  border-color: var(--color-alert);
}

.alert__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert__content {
  flex: 1;
  min-width: 0;
}

.alert__title {
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-1);
}

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

.alert__close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.alert__close:hover {
  color: var(--color-text-primary);
  background-color: rgba(255, 255, 255, 0.1);
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-regolith);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toastSlideIn var(--duration-slow) var(--ease-out);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast--success {
  border-left: 4px solid var(--color-signal);
}

.toast--error {
  border-left: 4px solid var(--color-alert);
}

.toast__message {
  font-size: var(--text-sm);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  background-color: var(--color-regolith);
  color: var(--color-text-secondary);
}

.badge--signal {
  background-color: var(--color-signal);
  color: var(--color-void-black);
}

.badge--alert {
  background-color: var(--color-alert);
  color: var(--color-void-black);
}

.badge--data {
  background-color: var(--color-data);
  color: var(--color-void-black);
}

.badge--outline {
  background-color: transparent;
  border: 1px solid currentColor;
}

/* Tag */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-md);
  background-color: var(--color-crater);
  color: var(--color-text-secondary);
}

.tag__remove {
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  margin-left: var(--space-1);
  opacity: 0.6;
  transition: opacity var(--duration-fast);
}

.tag__remove:hover {
  opacity: 1;
}

/* =============================================================================
   14. LOADING STATES
   ============================================================================= */

/* Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-dust);
  border-top-color: var(--color-signal);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

.spinner--sm { width: 16px; height: 16px; border-width: 2px; }
.spinner--lg { width: 40px; height: 40px; border-width: 3px; }
.spinner--xl { width: 56px; height: 56px; border-width: 4px; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Skeleton */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-crater) 25%,
    var(--color-regolith) 50%,
    var(--color-crater) 75%
  );
  background-size: 200% 100%;
  animation: skeleton 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton--text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton--title {
  height: 2em;
  width: 60%;
}

.skeleton--avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

.skeleton--image {
  width: 100%;
  aspect-ratio: 16 / 9;
}

/* Progress Bar */
.progress {
  height: 8px;
  background-color: var(--color-crater);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  background-color: var(--color-signal);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--ease-out);
}

.progress--indeterminate .progress__bar {
  width: 30%;
  animation: progressIndeterminate 1.5s ease-in-out infinite;
}

@keyframes progressIndeterminate {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(10, 10, 11, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-above);
}

/* =============================================================================
   15. DECORATIVE ELEMENTS
   ============================================================================= */

/* Divider */
.divider {
  height: 1px;
  background-color: var(--color-border-subtle);
  margin: var(--space-6) 0;
}

.divider--vertical {
  width: 1px;
  height: auto;
  margin: 0 var(--space-4);
}

.divider--fade {
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-dust),
    transparent
  );
}

/* Scan Line Effect */
.scan-line {
  position: absolute;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-signal),
    transparent
  );
  opacity: 0.5;
  animation: scanLine 4s linear infinite;
}

@keyframes scanLine {
  0% { top: 0; }
  100% { top: 100%; }
}

/* Glow Effect */
.glow {
  box-shadow: var(--shadow-glow-signal);
}

.glow--data {
  box-shadow: var(--shadow-glow-data);
}

.glow--alert {
  box-shadow: var(--shadow-glow-alert);
}

/* Pulse Indicator */
.pulse {
  position: relative;
}

.pulse::before {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--color-signal);
  border-radius: var(--radius-full);
  top: 0;
  right: 0;
}

.pulse::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background-color: var(--color-signal);
  border-radius: var(--radius-full);
  top: 0;
  right: 0;
  animation: pulse 2s ease-out infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(3);
    opacity: 0;
  }
}

/* Grid Pattern Background */
.bg-grid {
  background-image:
    linear-gradient(rgba(139, 139, 141, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 139, 141, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* Stars Background */
.bg-stars {
  background-image:
    radial-gradient(1px 1px at 20px 30px, var(--color-lab-white), transparent),
    radial-gradient(1px 1px at 40px 70px, var(--color-moon-grey), transparent),
    radial-gradient(1px 1px at 50px 160px, var(--color-lab-white), transparent),
    radial-gradient(1px 1px at 90px 40px, var(--color-moon-grey), transparent),
    radial-gradient(1px 1px at 130px 80px, var(--color-lab-white), transparent),
    radial-gradient(1px 1px at 160px 120px, var(--color-moon-grey), transparent);
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* =============================================================================
   16. ANIMATIONS & KEYFRAMES
   ============================================================================= */

/* Fade In */
.fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Fade In Up */
.fade-in-up {
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In Down */
.fade-in-down {
  animation: fadeInDown var(--duration-slow) var(--ease-out);
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scale In */
.scale-in {
  animation: scaleIn var(--duration-normal) var(--ease-spring);
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Slide In Right */
.slide-in-right {
  animation: slideInRight var(--duration-slow) var(--ease-out);
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* Stagger Animation Helper */
.stagger > * {
  opacity: 0;
  animation: fadeInUp var(--duration-slow) var(--ease-out) forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 50ms; }
.stagger > *:nth-child(3) { animation-delay: 100ms; }
.stagger > *:nth-child(4) { animation-delay: 150ms; }
.stagger > *:nth-child(5) { animation-delay: 200ms; }
.stagger > *:nth-child(6) { animation-delay: 250ms; }
.stagger > *:nth-child(7) { animation-delay: 300ms; }
.stagger > *:nth-child(8) { animation-delay: 350ms; }

/* =============================================================================
   17. UTILITY CLASSES
   ============================================================================= */

/* Display */
.hidden { display: none !important; }
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Overflow */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-scroll { overflow: scroll; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Visibility */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

/* Cursor */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* User Select */
.select-none { user-select: none; }
.select-all { user-select: all; }

/* Pointer Events */
.pointer-events-none { pointer-events: none; }
.pointer-events-auto { pointer-events: auto; }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-screen { width: 100vw; }

/* Height */
.h-full { height: 100%; }
.h-auto { height: auto; }
.h-screen { height: 100vh; }
.min-h-screen { min-height: 100vh; }

/* Margin */
.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Padding */
.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Border Radius */
.rounded-none { border-radius: 0; }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Background */
.bg-transparent { background-color: transparent; }
.bg-primary { background-color: var(--color-bg-primary); }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-elevated { background-color: var(--color-bg-elevated); }

/* Font Family */
.font-mono { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }

/* Font Weight */
.font-light { font-weight: var(--weight-light); }
.font-normal { font-weight: var(--weight-normal); }
.font-medium { font-weight: var(--weight-medium); }
.font-semibold { font-weight: var(--weight-semibold); }
.font-bold { font-weight: var(--weight-bold); }

/* Truncate */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* =============================================================================
   18. RESPONSIVE ADJUSTMENTS
   ============================================================================= */

/* Mobile First Breakpoints */
@media (max-width: 639px) {
  :root {
    --text-5xl: 3rem;
    --text-4xl: 2.25rem;
    --text-3xl: 1.75rem;
  }

  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .hero {
    min-height: auto;
    padding: var(--space-9) var(--space-4);
  }

  .nav__links {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }

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

  .form__row {
    grid-template-columns: 1fr;
  }

  .modal {
    max-width: calc(100vw - var(--space-4));
    max-height: calc(100vh - var(--space-4));
  }

  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
  }

  /* Hide on mobile */
  .hide-mobile { display: none !important; }
}

/* Tablet */
@media (min-width: 640px) and (max-width: 1023px) {
  .grid--cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Hide on tablet */
  .hide-tablet { display: none !important; }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  /* Show on desktop only */
  .show-desktop { display: block; }

  /* Hide on desktop */
  .hide-desktop { display: none !important; }
}

/* Large Desktop */
@media (min-width: 1280px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* =============================================================================
   19. DARK/LIGHT MODE (Future Enhancement)
   ============================================================================= */

/*
   This design system is dark-mode first.
   Light mode can be added by overriding CSS variables:

   @media (prefers-color-scheme: light) {
     :root {
       --color-bg-primary: #f5f5f7;
       --color-bg-secondary: #e5e5e7;
       --color-text-primary: #0a0a0b;
       // ... etc
     }
   }

   Or with a class toggle:

   .light-mode {
     --color-bg-primary: #f5f5f7;
     // ... etc
   }
*/

/* =============================================================================
   20. PRINT STYLES
   ============================================================================= */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  img {
    max-width: 100% !important;
  }

  @page {
    margin: 2cm;
  }

  h2, h3 {
    page-break-after: avoid;
  }

  .nav,
  .sidebar,
  .modal,
  .toast-container,
  .no-print {
    display: none !important;
  }
}

/* =============================================================================
   END OF STYLESHEET
   ============================================================================= */