/* CSS Custom Properties (2025 Standard) */
:root {
  /* Colors */
  --color-primary: #1a1a1a;
  --color-error: #dc2626;
  --color-text-secondary: #666;
  --color-text-primary: #1a1a1a;
  --color-background: #ffffff;
  --color-border: #e5e5e5;
  --color-border-light: #e0e0e0;

  /* Spacing */
  --spacing-xs: 10px;
  --spacing-sm: 15px;
  --spacing-base: 20px;
  --spacing-md: 25px;
  --spacing-lg: 30px;
  --spacing-xl: 40px;

  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.85rem;
  --font-size-md: 0.9rem;
  --font-size-lg: 1rem;
  --font-size-xl: 1.1rem;
  --font-size-2xl: 1.25rem;
  --font-size-3xl: 1.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --line-height-base: 1.6;
  --line-height-tight: 1.4;

  /* Transitions */
  --transition-base: 0.3s ease-in-out;
  --transition-fast: 0.15s ease-in-out;

  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 0;

  /* Animation durations */
  --animation-duration-fast: 0.3s;
  --animation-duration-base: 0.4s;
  --animation-duration-slow: 0.6s;
  --animation-duration-slower: 0.9s;
}

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

[hidden] {
  display: none !important;
}

/* Screen reader only class for ARIA live regions */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  line-height: var(--line-height-base);
  font-weight: var(--font-weight-normal);
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-base);
}

header {
  background: transparent;
  padding: 0;
  margin-bottom: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-base);
}

.header-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-base);
}

.logo {
  height: 50px;
  width: auto;
}

h1 {
  color: var(--color-text-primary);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-medium);
  margin: 0;
}

h2 {
  color: var(--color-text-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  margin: 0;
  line-height: var(--line-height-tight);
}

.loading-state,
.success-state,
.error-state {
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-base);
}

.loading-text {
  margin-top: 1.5rem;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-border-light);
  border-top: 2px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

.checkmark {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: block;
  stroke-width: 2;
  stroke: var(--color-primary);
  stroke-miterlimit: 10;
  margin: 0 auto 1.25rem;
  box-shadow: inset 0 0 0 var(--color-primary);
  animation: fill var(--animation-duration-base) ease-in-out 0.4s forwards,
    scale var(--animation-duration-fast) ease-in-out var(--animation-duration-slower) both;
}

.checkmark__circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke-width: 2;
  stroke-miterlimit: 10;
  stroke: var(--color-primary);
  fill: none;
  animation: stroke var(--animation-duration-slow) cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark__check {
  transform-origin: 50% 50%;
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: stroke var(--animation-duration-fast) cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke {
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes scale {

  0%,
  100% {
    transform: none;
  }

  50% {
    transform: scale3d(1.1, 1.1, 1);
  }
}

@keyframes fill {
  100% {
    box-shadow: inset 0 0 0 30px var(--color-primary);
  }
}

.error-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: block;
  stroke-width: 2;
  stroke: var(--color-error);
  stroke-miterlimit: 10;
  margin: 0 auto 1.25rem;
  box-shadow: inset 0 0 0 var(--color-error);
  animation: fill-error var(--animation-duration-base) ease-in-out 0.4s forwards,
    scale var(--animation-duration-fast) ease-in-out var(--animation-duration-slower) both;
}

.error-icon__circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke-width: 2;
  stroke-miterlimit: 10;
  stroke: var(--color-error);
  fill: none;
  animation: stroke var(--animation-duration-slow) cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.error-icon__cross {
  transform-origin: 50% 50%;
  stroke-dasharray: 57;
  stroke-dashoffset: 57;
  stroke-linecap: round;
  animation: stroke var(--animation-duration-fast) cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

.error-text {
  margin-top: 1rem;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 500px;
}

@keyframes fill-error {
  100% {
    box-shadow: inset 0 0 0 30px var(--color-error);
  }
}

/* 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;
  }
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-base) var(--spacing-sm);
  }

  header {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
    width: 100%;
  }

  .logo {
    height: 40px;
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  .loading-state,
  .success-state,
  .error-state {
    padding: var(--spacing-lg) var(--spacing-sm);
    min-height: 150px;
  }

  .loading-text {
    font-size: var(--font-size-md);
  }

  .checkmark,
  .error-icon {
    width: 60px;
    height: 60px;
  }

  .error-text {
    font-size: var(--font-size-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: var(--spacing-sm) var(--spacing-xs);
  }

  header {
    margin-bottom: var(--spacing-md);
  }

  .logo {
    height: 35px;
  }

  h1 {
    font-size: var(--font-size-xl);
  }

  h2 {
    font-size: var(--font-size-base);
  }

  .loading-state,
  .success-state,
  .error-state {
    padding: var(--spacing-md) var(--spacing-xs);
    min-height: 120px;
  }

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

  .checkmark,
  .error-icon {
    width: 50px;
    height: 50px;
  }

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