/**
 * C4 Universe — Mobile Optimizations
 * P2: Full Polish — Touch, Responsive, Performance
 */

/* ========================================
   TOUCH GESTURES & INTERACTIONS
   ======================================== */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover effects on touch devices */
  .hover-lift:hover,
  .hover-glow:hover,
  .hover-scale:hover {
    transform: none;
    box-shadow: none;
  }
  
  /* Enable touch-active states */
  .hover-lift:active,
  .tilt-card:active {
    transform: scale(0.98);
  }
  
  /* Larger touch targets */
  .nav-link,
  .btn,
  .axis-btn,
  .app-link {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  
  /* Remove magnetic effect on touch */
  .magnetic-btn {
    transform: none !important;
  }
}

/* ========================================
   RESPONSIVE TYPOGRAPHY
   ======================================== */
:root {
  /* Fluid typography scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.65vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.8rem + 2.25vw, 3rem);
  --text-5xl: clamp(3rem, 2rem + 5vw, 4.5rem);
}

/* ========================================
   TABLET BREAKPOINT (768px - 1023px)
   ======================================== */
@media (max-width: 1023px) {
  .hero-container {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-title {
    font-size: var(--text-4xl);
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-ctas {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .applications-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .navigator-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .cube-preview {
    order: -1;
  }
  
  .nav-menu {
    gap: 1rem;
  }
}

/* ========================================
   MOBILE BREAKPOINT (< 768px)
   ======================================== */
@media (max-width: 767px) {
  /* Navigation */
  .nav-container {
    padding: 0.75rem 1rem;
  }
  
  .nav-logo .logo-text {
    display: none;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10,10,18,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 100;
  }
  
  .nav-menu.active {
    opacity: 1;
    pointer-events: all;
  }
  
  .nav-link {
    font-size: var(--text-xl);
    padding: 1rem 2rem;
  }
  
  .mobile-toggle {
    display: flex;
    z-index: 101;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
  }
  
  .mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
  }
  
  /* Hero */
  .hero-cosmic {
    min-height: auto;
    padding: 6rem 0 3rem;
  }
  
  .hero-badge {
    font-size: var(--text-xs);
    padding: 0.375rem 0.75rem;
  }
  
  .hero-title {
    font-size: var(--text-3xl);
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .stat-item {
    min-width: calc(50% - 0.5rem);
  }
  
  .stat-number {
    font-size: var(--text-2xl);
  }
  
  /* Applications */
  .applications-grid {
    grid-template-columns: 1fr;
  }
  
  .app-card {
    padding: 1.5rem;
  }
  
  .app-icon {
    width: 48px;
    height: 48px;
  }
  
  /* Navigator */
  .state-display {
    padding: 1.5rem;
  }
  
  .state-coordinates {
    font-size: var(--text-xl);
  }
  
  .axis-values {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .axis-val {
    padding: 0.5rem;
    font-size: var(--text-sm);
  }
  
  /* Cube */
  .c4-cube-container,
  #c4-cube-canvas,
  #nav-cube-canvas {
    max-width: 280px;
    max-height: 280px;
  }
  
  /* Footer */
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Cards */
  .fact-card,
  .functor-card,
  .kernel-card,
  .domain-card {
    padding: 1.25rem;
  }
  
  /* Typography */
  .section-title {
    font-size: var(--text-2xl);
  }
  
  .title-eyebrow {
    font-size: var(--text-sm);
  }
  
  /* Einstein Test specific */
  .cdi-diagram {
    flex-direction: column;
    gap: 1rem;
  }
  
  .cdi-arrow {
    transform: rotate(90deg);
  }
  
  .derivation-steps {
    padding-left: 1rem;
  }
  
  /* UCOS specific */
  .kernels-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* O-Axis specific */
  .level-card {
    flex-direction: column;
    text-align: center;
  }
  
  /* Search overlay */
  .search-container {
    width: 95%;
    padding: 1rem;
  }
  
  .search-result-item {
    padding: 0.625rem;
  }
  
  /* Toast */
  .toast-container {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
  
  .toast {
    min-width: auto;
    max-width: none;
  }
  
  /* Keyboard shortcuts hint */
  .keyboard-shortcuts {
    display: none;
  }
}

/* ========================================
   SMALL MOBILE (< 480px)
   ======================================== */
@media (max-width: 479px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero-title {
    font-size: var(--text-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-base);
  }
  
  .btn {
    padding: 0.75rem 1.25rem;
    font-size: var(--text-sm);
  }
  
  .applications-grid,
  .facts-grid,
  .theorems-grid,
  .kernels-grid {
    grid-template-columns: 1fr;
  }
  
  .cube-labels {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .state-metrics {
    flex-direction: column;
    gap: 1rem;
  }
  
  .state-actions {
    flex-direction: column;
  }
  
  .btn-small {
    width: 100%;
  }
}

/* ========================================
   LANDSCAPE ORIENTATION
   ======================================== */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-cosmic {
    min-height: auto;
    padding: 4rem 0 2rem;
  }
  
  .hero-visual {
    display: none;
  }
  
  .nav-menu {
    padding: 1rem;
  }
  
  .nav-link {
    padding: 0.5rem 1rem;
  }
}

/* ========================================
   HIGH-DPI SCREENS
   ======================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .starfield canvas {
    image-rendering: pixelated;
  }
}

/* ========================================
   DARK MODE (system preference)
   ======================================== */
@media (prefers-color-scheme: dark) {
  /* Already dark by default, but can add adjustments */
  :root {
    --glass-bg: rgba(20,20,35,0.7);
  }
}

/* ========================================
   SAFE AREA (notch devices)
   ======================================== */
@supports (padding: max(0px)) {
  .main-nav {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
    padding-top: max(0.75rem, env(safe-area-inset-top));
  }
  
  .container {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
  
  .toast-container {
    bottom: max(2rem, env(safe-area-inset-bottom));
  }
}

/* ========================================
   PRINT STYLES (mobile friendly)
   ======================================== */
@media print {
  @page {
    margin: 1cm;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
}