:root {
  --color-primary: #ffffff;
  --color-secondary: #f5f5f5;
  --color-text-primary: #111111;
  --color-text-secondary: #666666;
  --color-accent: #000000;
  --color-border: #e0e0e0;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  --border-radius: 8px;
  --max-width: 1150px;
  
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-heading: "Montserrat", system-ui, sans-serif;
}

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

html,
body {
  height: 100%;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background-color: var(--color-primary);
}

body {
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s ease-in-out;
}

a:hover {
  opacity: 0.7;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  border-radius: var(--border-radius);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
  transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

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

.btn-primary:hover {
  background-color: #333333;
}

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

.btn-secondary:hover {
  background-color: #eeeeee;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
}

/* BEM Naming Convention Examples */
.card {
  background-color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  transition: box-shadow 0.2s ease-in-out;
}

.card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.card__header {
  margin-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-md);
}

.card__title {
  margin-bottom: 0;
  font-size: 1.25rem;
}

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

.card__footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid--2-cols {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3-cols {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid--4-cols {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

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

  .container {
    padding: 0 var(--spacing-sm);
  }
}

/* Loading and state utilities */
.is-loading {
  opacity: 0.6;
  pointer-events: none;
}

.is-hidden {
  display: none;
}

.is-visible {
  display: block;
}

/* Typography utilities */
.text-center {
  text-align: center;
}

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

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

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

/* Spacing utilities */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

/* Blazor validation and error boundary styles */
.valid.modified:not([type=checkbox]) {
  outline: 1px solid #26b050;
}

.invalid {
  outline: 1px solid #e50000;
}

.validation-message {
  color: #e50000;
  font-size: 0.875rem;
  margin-top: 4px;
}

.blazor-error-boundary {
  background: #b32121;
  padding: 1rem 1rem 1rem 3.7rem;
  color: white;
}

.blazor-error-boundary::after {
  content: "Hiba történt.";
}

#blazor-error-ui {
  background: lightyellow;
  bottom: 0;
  box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
  display: none;
  left: 0;
  padding: 0.6rem 1.25rem 0.7rem 1.25rem;
  position: fixed;
  width: 100%;
  z-index: 1000;
}

#blazor-error-ui .dismiss {
  cursor: pointer;
  position: absolute;
  right: 0.75rem;
  top: 0.5rem;
}