:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #cbd5e1;
  --focus-ring: rgba(37, 99, 235, 0.25);
  --error-color: #ef4444;
  --error-bg: #fef2f2;
  --success-color: #10b981;
  --success-bg: #ecfdf5;
  --radius: 8px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  padding: 40px 16px;
}

.container {
  max-width: 560px;
  margin: 0 auto;
}

.form-header {
  text-align: center;
  margin-bottom: 24px;
}

.form-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.form-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.form-card {
  background: var(--card-bg);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.required-asterisk {
  color: var(--error-color);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text-main);
  background-color: #ffffff;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

input:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
  resize: vertical;
}

.error-feedback {
  display: block;
  color: var(--error-color);
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 1rem;
}

.form-actions {
  margin-top: 24px;
}

.btn-submit {
  width: 100%;
  padding: 12px 20px;
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.btn-submit:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.btn-submit:active:not(:disabled) {
  transform: scale(0.99);
}

.btn-submit:disabled {
  background-color: #94a3b8;
  cursor: not-allowed;
}

.alert {
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin-bottom: 20px;
  display: block;
}

.alert.hidden {
  display: none;
}

.alert-success {
  background-color: var(--success-bg);
  color: var(--success-color);
  border: 1px solid #a7f3d0;
}

.alert-error {
  background-color: var(--error-bg);
  color: var(--error-color);
  border: 1px solid #fecaca;
}

.loader {
  width: 16px;
  height: 16px;
  border: 2px solid #ffffff;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader.hidden {
  display: none;
}

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