/* ==========================================================================
   Morpheme UI — Error Pages Shared Styles
   Design tokens from DESIGN.md § 14
   ========================================================================== */

/* --- Morpheme Design Tokens --- */
:root {
  /* Brand */
  --color-primary:         #1D6EEB;
  --color-primary-25:      #F5F8FF;
  --color-primary-100:     #BFDBFE;
  --color-primary-600:     #1B69C2;
  --color-primary-700:     #1554A1;
  --color-primary-light:   #EFF8FF;
  --color-secondary:       #E55B05;
  --color-secondary-light: #FFF3EB;

  /* Foundation */
  --color-white:   #FFFFFF;
  --color-black:   #000000;
  --color-info:    #28A0F8;
  --color-warning: #F79009;
  --color-success: #12B76A;
  --color-error:   #F04438;

  /* Semantic light backgrounds */
  --color-error-light:   #FEF3F2;
  --color-warning-light: #FFFAEB;
  --color-success-light: #ECFDF3;
  --color-info-light:    #EFF8FF;

  /* Neutral */
  --color-gray-25:  #FCFCFD;
  --color-gray-50:  #F9FAFB;
  --color-gray-100: #F2F4F7;
  --color-gray-200: #EAECF0;
  --color-gray-300: #D0D5DD;
  --color-gray-400: #98A2B3;
  --color-gray-500: #667085;
  --color-gray-600: #475467;
  --color-gray-700: #344054;
  --color-gray-800: #1D2939;
  --color-gray-900: #101828;

  /* Typography */
  --font-family: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --text-xs:   12px;
  --text-sm:   14px;
  --text-md:   16px;
  --text-lg:   18px;
  --text-xl:   20px;
  --text-2xl:  24px;
  --text-3xl:  30px;
  --text-4xl:  36px;
  --text-5xl:  48px;
  --text-6xl:  60px;
  --text-7xl:  72px;

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Border Radius */
  --radius-sm:   4px;
  --radius-md:   6px;
  --radius-lg:   8px;
  --radius-xl:   12px;
  --radius-2xl:  16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(16,24,40,0.05);
  --shadow:     0 1px 3px rgba(16,24,40,0.10), 0 1px 2px rgba(16,24,40,0.06);
  --shadow-md:  0 4px 8px -2px rgba(16,24,40,0.10), 0 2px 4px -2px rgba(16,24,40,0.06);
  --shadow-lg:  0 12px 16px -4px rgba(16,24,40,0.08), 0 4px 6px -2px rgba(16,24,40,0.03);
  --shadow-xl:  0 20px 24px -4px rgba(16,24,40,0.08), 0 8px 8px -4px rgba(16,24,40,0.03);
  --shadow-2xl: 0 24px 48px -12px rgba(16,24,40,0.18);

  /* Motion */
  --duration-fast:   100ms;
  --duration-base:   150ms;
  --duration-slow:   200ms;
  --duration-slower: 300ms;
  --ease-out:    cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0.0, 0.2, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-md);
  line-height: 1.5;
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Error Page Layout --- */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.error-content {
  text-align: center;
  max-width: 540px;
  width: 100%;
  padding: var(--space-8);
}

/* --- Illustration --- */
.error-illustration {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

/* --- Error Code --- */
.error-code {
  font-size: var(--text-7xl);
  font-weight: 700;
  line-height: 90px;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}

/* --- Title --- */
.error-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 32px;
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}

/* --- Description --- */
.error-description {
  font-size: var(--text-md);
  font-weight: 400;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: var(--space-8);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 var(--space-5);
  font-family: var(--font-family);
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius-lg);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
  text-decoration: none;
  gap: var(--space-2);
}

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

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

.btn-primary:hover {
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-primary:active {
  background-color: var(--color-primary-700);
  border-color: var(--color-primary-700);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-25);
}

.btn-secondary:active {
  background-color: var(--color-primary-100);
}

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

.btn-ghost:hover {
  background-color: var(--color-primary-25);
}

.btn-ghost:active {
  background-color: var(--color-primary-100);
}

/* --- Actions Container --- */
.error-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* --- Footer --- */
.error-footer {
  margin-top: var(--space-12);
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

.error-footer a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.error-footer a:hover {
  color: var(--color-primary-600);
}

.error-footer a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --- Badge --- */
.error-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.error-badge--warning {
  background-color: var(--color-warning-light);
  color: #B54708;
}

/* --- Progress Bar --- */
.progress-container {
  max-width: 320px;
  margin: 0 auto var(--space-8);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.progress-bar__fill {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--duration-slower) var(--ease-in-out);
}

.progress-label {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  font-weight: 400;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .error-page {
    padding: var(--space-4);
  }

  .error-content {
    padding: var(--space-6);
  }

  .error-code {
    font-size: var(--text-5xl);
    line-height: 60px;
  }

  .error-title {
    font-size: var(--text-xl);
    line-height: 28px;
  }

  .error-illustration {
    width: 120px;
    height: 120px;
    margin-bottom: var(--space-6);
  }

  .error-illustration svg {
    width: 56px;
    height: 56px;
  }

  .error-actions {
    flex-direction: column;
  }

  .error-actions .btn {
    width: 100%;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .btn,
  .error-footer a,
  .progress-bar__fill {
    transition: none;
  }
}