/* Critical CSS - Above-the-fold styles only */
/* Performance optimization: 2025 - Split from 107KB bundle */

@layer critical, above-fold, fonts;

@layer critical {
  /* Essential CSS Reset */
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  /* Root Variables - Only critical ones */
  :root {
    /* Critical Colors */
    --color-primary: oklch(55% 0.25 250);
    --color-text: #0a0a0a;
    --color-bg: oklch(99% 0 0);
    --color-bg-glass: color-mix(in oklch, white 70%, transparent);
    
    /* Critical Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --fs-base: clamp(1rem, 0.95rem + 0.5vw, 1.125rem);
    --fs-2xl: clamp(1.5rem, 1.35rem + 1.25vw, 2rem);
    --fs-5xl: clamp(2.25rem, 2rem + 5vw, 4rem);
    
    /* Critical Spacing */
    --space-lg: clamp(1rem, 0.8rem + 1vw, 1.5rem);
    --space-xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
    
    /* Critical Transitions */
    --transition-base: 250ms ease;
    
    /* Critical Z-Index */
    --z-sticky: 1020;
    --z-modal: 1050;
  }

  /* Dark theme essentials */
  [data-theme="dark"] {
    --color-primary: oklch(70% 0.15 250);
    --color-text: #e8e8e8;
    --color-bg: #0a0a0a;
    --color-bg-glass: color-mix(in oklch, black 85%, transparent);
  }

  /* Critical body styles */
  html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
  }
}

@layer above-fold {
  /* Header - Critical for navigation */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-bg-glass);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
  }

  .nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 60px;
  }

  .nav-logo {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
  }

  /* Hero - Above the fold */
  .hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
  }

  .hero-content {
    text-align: center;
    padding: var(--space-xl);
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
  }

  .hero-name {
    font-size: var(--fs-5xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), color-mix(in oklch, var(--color-primary) 80%, black));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
  }

  .hero-subtitle {
    font-size: var(--fs-2xl);
    color: var(--color-text);
    opacity: 0.8;
    margin-bottom: var(--space-xl);
    line-height: 1.4;
  }
}

@layer fonts {
  /* Font loading optimization with font-display */
  @font-face {
    font-family: 'Inter';
    src: url('/fonts/inter-variable.woff2') format('woff2-variations');
    font-weight: 100 900;
    font-style: normal;
    font-display: swap; /* Immediate text render with fallback */
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  }

  @font-face {
    font-family: 'Inter';
    src: url('/fonts/inter-variable-italic.woff2') format('woff2-variations');
    font-weight: 100 900;
    font-style: italic;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  }
}

/* Mobile optimizations */
@media (max-width: 768px) {
  .hero-name {
    font-size: clamp(1.75rem, 1.5rem + 2.5vw, 2.25rem);
  }
  
  .hero-subtitle {
    font-size: clamp(1.125rem, 1rem + 1vw, 1.25rem);
  }
  
  .nav-container {
    padding: 0 1rem;
    height: 56px;
  }
}

/* Prefers reduced motion */
@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;
  }
}/* Non-Critical CSS - Below-the-fold and secondary styles */
/* Performance optimization: Lazy-loaded after critical path */

@layer components, utilities, animations, print;

@layer components {
  /* Disable heavy hero intro animations to reduce FCP/LCP and CLS */
  .hero-impact,
  .hero-title,
  .hero-pronunciation,
  .hero-subtitle {
    opacity: 1 !important;
    animation: none !important;
    transform: none !important;
  }
  /* shadcn-style button aliases mapping existing .btn classes to unified naming */
  .ui-button,
  .btn { /* no Tailwind; map to existing tokens */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--fs-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 44px;
    touch-action: manipulation;
  }

  .ui-button--primary,
  .btn-primary { background: var(--color-primary); color: white; }
  .ui-button--primary:hover,
  .btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
  .ui-button--secondary,
  .btn-secondary { background: transparent; color: var(--color-primary); border: 2px solid var(--color-primary); }
  .ui-button--secondary:hover,
  .btn-secondary:hover { background: var(--color-primary); color: white; }
  .ui-button--ghost,
  .btn-ghost { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
  .ui-button--ghost:hover,
  .btn-ghost:hover { background: var(--color-bg-hover); border-color: var(--color-primary); }

  /* Extended color system */
  :root {
    --color-primary-dark: oklch(45% 0.25 250);
    --color-primary-light: oklch(65% 0.25 250);
    --color-secondary: oklch(50% 0.18 290);
    --color-accent: oklch(75% 0.35 160);
    --color-success: oklch(60% 0.25 160);
    --color-warning: oklch(75% 0.15 85);
    --color-error: oklch(55% 0.22 25);
    --color-nhs: #005eb8;
    --color-cambridge: #003e74;
    
    /* Missing token defaults */
    --color-border: color-mix(in oklch, var(--color-bg) 85%, var(--color-text) 15%);
    --color-bg-hover: color-mix(in oklch, var(--color-bg) 95%, var(--color-text) 5%);
    --font-size-sm: clamp(0.875rem, 0.825rem + 0.25vw, 0.9375rem);
    
    /* Extended spacing */
    --space-xs: clamp(0.375rem, 0.3rem + 0.375vw, 0.5rem);
    --space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
    --space-md: clamp(0.75rem, 0.6rem + 0.75vw, 1rem);
    --space-2xl: clamp(2rem, 1.6rem + 2vw, 3rem);
    --space-3xl: clamp(3rem, 2.4rem + 3vw, 4rem);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px 0 rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Extended z-index */
    --z-dropdown: 1000;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* shadcn token aliases (mapped to existing system vars) */
    --background: var(--color-bg);
    --foreground: var(--color-text);
    --card: var(--color-bg);
    --card-foreground: var(--color-text);
    --popover: var(--color-bg);
    --popover-foreground: var(--color-text);
    --muted: color-mix(in oklch, var(--color-bg) 92%, var(--color-text));
    --muted-foreground: color-mix(in oklch, var(--color-text) 75%, var(--color-bg));
    --accent: var(--color-accent);
    --accent-foreground: #08342a;
    --primary: var(--color-primary);
    --primary-foreground: #ffffff;
    --secondary: var(--color-secondary);
    --secondary-foreground: #ffffff;
    --destructive: var(--color-error);
    --destructive-foreground: #ffffff;
    --border: var(--color-border);
    --input: var(--color-border);
    --ring: var(--color-primary);
    --radius: var(--radius-md);
  }

  /* Card variants */
  .card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    border: 1px solid rgba(0, 0, 0, 0.05);
  }

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

  .card--glass {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
  }

  .card--solid {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .card--outlined {
    background: transparent;
    border: 2px solid var(--color-primary);
    box-shadow: none;
  }

  .card--outlined:hover {
    background: color-mix(in oklch, var(--color-primary) 5%, transparent);
    box-shadow: var(--shadow-sm);
  }

  /* Button system */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--fs-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 44px;
    touch-action: manipulation;
  }

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

  .btn--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
  }

  .btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
  }

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

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

  .btn--ghost:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-primary);
  }

  /* Form components */
  .form-group {
    margin-bottom: var(--space-lg);
  }

  .form-label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 600;
    color: var(--color-text);
  }

  .form-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--fs-base);
    background: var(--color-bg);
    color: var(--color-text);
    transition: all var(--transition-base);
    min-height: 44px;
  }

  .form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-primary) 20%, transparent);
  }

  .form-input--error {
    border-color: var(--color-error);
  }

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

  .form-error {
    color: var(--color-error);
    font-size: var(--fs-sm);
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }

  .form-success {
    color: var(--color-success);
    font-size: var(--fs-sm);
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }

  /* shadcn-style component aliases */
  .input,
  .select,
  .textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--input);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: var(--fs-base);
    background: var(--background);
    color: var(--foreground);
    transition: all var(--transition-base);
    min-height: 44px;
  }

  .input:focus,
  .select:focus,
  .textarea:focus {
    outline: none;
    border-color: var(--ring);
    box-shadow: 0 0 0 3px color-mix(in oklch, var(--ring) 20%, transparent);
  }

  .label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 600;
    color: var(--foreground);
  }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    background: var(--muted);
    color: var(--muted-foreground);
    font-weight: 600;
    font-size: 0.75rem;
    line-height: 1;
  }

  .badge--secondary {
    background: color-mix(in oklch, var(--secondary) 15%, var(--background));
    color: var(--secondary);
    border-color: color-mix(in oklch, var(--secondary) 40%, var(--border));
  }

  .badge--outline {
    background: transparent;
    color: var(--foreground);
  }

  .badge--destructive {
    background: color-mix(in oklch, var(--destructive) 15%, var(--background));
    color: var(--destructive);
    border-color: color-mix(in oklch, var(--destructive) 40%, var(--border));
  }

  /* Navigation enhancements */
  .nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-md);
  }

  .nav-link {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
  }

  /* Accessibility: enforce adequate contrast for muted/subtle text */
  .lead,
  .cert-issuer,
  .stat-label,
  .toggle-text,
  .muted,
  .text-subtle {
    color: #5a5a5a;
  }

  .nav-link:hover {
    color: var(--color-primary);
    background: color-mix(in oklch, var(--color-primary) 10%, transparent);
  }

  .nav-link--active {
    color: var(--color-primary);
    font-weight: 600;
  }

  .nav-link--active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
    transform: translateX(-50%);
  }

  /* Mobile navigation */
  .nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    position: relative;
    width: 44px;
    height: 44px;
  }

  .nav-toggle-icon {
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
  }

  .nav-toggle-icon::before,
  .nav-toggle-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
  }

  .nav-toggle-icon::before {
    top: -8px;
  }

  .nav-toggle-icon::after {
    bottom: -8px;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon {
    background: transparent;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    transform: rotate(45deg);
    top: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
  }

  @media (max-width: 768px) and (prefers-reduced-motion: reduce) {
    .nav-menu { transition: none; }
    body.menu-open::after { transition: none; }
  }

  @media (max-width: 768px) {
    .nav-toggle {
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .nav-menu {
      position: fixed;
      top: 4rem;
      right: 0;
      bottom: 0;
      width: min(85vw, 360px);
      background: var(--color-bg-glass);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-left: 1px solid var(--color-border);
      display: flex;
      flex-direction: column;
      padding: var(--space-lg);
      transform: translateX(100%);
      opacity: 0;
      pointer-events: none;
      transition: transform var(--transition-base), opacity var(--transition-base);
      overflow-y: auto;
      z-index: var(--z-popover);
      /* Prevent offscreen menu from being focusable until opened */
      visibility: hidden;
    }

    .nav-menu.active {
      transform: translateX(0);
      opacity: 1;
      pointer-events: all;
      visibility: visible;
    }

    body.menu-open::after {
      content: '';
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.25);
      backdrop-filter: blur(2px);
      -webkit-backdrop-filter: blur(2px);
      z-index: var(--z-modal-backdrop);
      opacity: 1;
      transition: opacity var(--transition-base);
    }

    .nav-link {
      padding: var(--space-md);
      width: 100%;
      text-align: center;
    }
  }
}

@layer utilities {
  /* Utility classes */
  .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;
  }

  .sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
  }

  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .text-center {
    text-align: center;
  }

  .text-left {
    text-align: left;
  }

  .text-right {
    text-align: right;
  }

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

@layer animations {
  /* Micro-interactions */
  @keyframes fade-in {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  @keyframes slide-in-up {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

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

  @keyframes pulse {
    0%, 100% {
      opacity: 1;
    }
    50% {
      opacity: 0.5;
    }
  }

  .animate-fade-in {
    animation: fade-in 0.5s ease-out;
  }

  .animate-slide-in-up {
    animation: slide-in-up 0.6s ease-out;
  }

  .animate-scale-in {
    animation: scale-in 0.4s ease-out;
  }

  .animate-pulse {
    animation: pulse 2s ease-in-out infinite;
  }

  /* Loading states */
  .skeleton {
    background: linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.1) 25%,
      rgba(0, 0, 0, 0.05) 50%,
      rgba(0, 0, 0, 0.1) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
  }

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

@layer print {
  /* Print styles */
  @media print {
    :root {
      --color-text: #000;
      --color-bg: #fff;
      --color-primary: #000;
    }

    * {
      background: transparent !important;
      box-shadow: none !important;
      text-shadow: none !important;
    }

    body {
      font-size: 12pt;
      line-height: 1.5;
    }

    .nav,
    .hero-background,
    .btn,
    [aria-hidden="true"] {
      display: none !important;
    }

    .card {
      border: 1px solid #000;
      box-shadow: none;
      break-inside: avoid;
    }

    h1, h2, h3, h4, h5, h6 {
      break-after: avoid;
    }

    p {
      orphans: 3;
      widows: 3;
    }

    a {
      text-decoration: underline;
    }

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

    .page-break {
      page-break-before: always;
    }
  }
}