:root {
  /* Základní barvy */
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --third-color: #cccccc;
  --next-color:#e6e6e6;
  --bg-light: #f0f0f0;
  --text-color: #333;
  --border-color: #eaeaea;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 15px;
  --spacing-base: 20px;
  --spacing-lg: 25px;
  --spacing-xl: 30px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 8px rgba(0,0,0,0.1);
  
  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: all 0.2s ease;
  --transition-base: all 0.3s ease;
}

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

body {
  background-color: var(--bg-light);
  color: var(--text-color);
  font-family: 'Segoe UI', Arial, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-base);
  gap: var(--spacing-base);
}

.column {
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  background-color: #ffffff;
  transition: var(--transition-base);
}

.column:hover {
  box-shadow: var(--shadow-md);
}

.left {
  width: 30%;
}

.middle {
  width: 50%;
}

.right {
  width: 20%;
}

.main {
  width: 65%;
}

.sidebar {
  width: 35%;
}

footer {
  background-color: #808080;
  padding: var(--spacing-base) 0;
  margin-top: var(--spacing-base);
}

nav ul {
  max-width: 1200px;
  margin: 0 auto;
  list-style: none;
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
}

nav a {
  color: white;
  text-decoration: none;
  transition: var(--transition-fast);
}

nav a:hover {
  color: #e0e0e0;
}

h2 {
  margin-bottom: var(--spacing-sm);
}

.standard-form {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group,
.form-actions {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  background-color: #fafafa;
  transition: var(--transition-base);
}

.form-group:hover,
.form-actions:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.form-group h3 {
  margin-top: 0;
  color: var(--text-color);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: var(--spacing-sm);
}

.input-wrapper {
  margin-bottom: var(--spacing-base);
}

.input-wrapper label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--text-color);
  font-size: 0.95rem;
}

.input-wrapper input,
.input-wrapper textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: var(--transition-base);
}

.input-wrapper input:focus,
.input-wrapper textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.input-wrapper textarea {
  min-height: 100px;
  resize: vertical;
}

.form-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn {
  min-width: 100px;
  padding: var(--spacing-sm) var(--spacing-base);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
  background-color: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn[type="reset"] {
  background-color: var(--secondary-color);
}

.btn[type="reset"]:hover {
  background-color: #545b62;
}

.radio-group {
  margin: var(--spacing-base) 0;
}

.radio-labels {
  display: flex;
  justify-content: space-around;
  margin-bottom: var(--spacing-sm);
}

.radio-labels label {
  font-weight: 600;
  color: var(--text-color);
}

.radio-inputs {
  display: flex;
  justify-content: space-around;
}

.radio-inputs input[type="radio"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.fees-container {
  display: flex;
  gap: var(--spacing-base);
  margin-bottom: var(--spacing-base);
}

.fees-group {
  flex: 1;
  min-width: 250px;
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }
  
  .column,
  .left,
  .middle,
  .right,
  .main,
  .sidebar {
    width: 100%;
  }
  
  .fees-container {
    flex-direction: column;
  }
  
  .fees-group {
    width: 100%;
  }
}

/* Přidat na konec existujícího souboru */

.number-input {
  text-align: right;
  font-family: monospace;
}

.error-message {
  color: #dc3545;
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
  display: none;
}

.input-wrapper.has-error .error-message {
  display: block;
}

.input-wrapper.has-error input {
  border-color: #dc3545;
}

.form-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.form-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  margin: -12px;
  border: 2px solid var(--primary-color);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.btn-icon {
  margin-right: var(--spacing-xs);
}

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

.btn-secondary {
  background-color: var(--secondary-color);
}
/* Přidat na konec existujícího souboru */

.error-message {
  color: #dc3545;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-block;
  margin-left: 8px;
  animation: shake 0.3s ease-in-out;
}

.input-wrapper.error input {
  border-color: #dc3545;
  background-color: #fff8f8;
}

.radio-group.error {
  border-color: #dc3545;
  background-color: #fff8f8;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.form-group.invalid {
  border-left: 3px solid #dc3545;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.standard-form.valid {
  background-color: var(--next-color);
  transition: background-color 0.3s ease;
}
.standard-form.valid .form-group {
  background-color: var(--next-color);
}

.standard-form.valid input:not([type="radio"]) {
  background-color: var(--next-color);
  border-color: #28a745;
}

.standard-form.valid .radio-group {
  background-color: var(--next-color);
}

.standard-form.valid .form-actions {
  background-color: var(--next-color);
}