:root {
  --primary-color: #1976d2;
  --primary-dark: #115293;
  --bg-color: #f5f5f5;
  --surface-color: #ffffff;
  --text-primary: rgba(0, 0, 0, 0.87);
  --text-secondary: rgba(0, 0, 0, 0.6);
  --divider: rgba(0, 0, 0, 0.12);
  --shadow-1: 0px 2px 1px -1px rgba(0,0,0,0.2),0px 1px 1px 0px rgba(0,0,0,0.14),0px 1px 3px 0px rgba(0,0,0,0.12);
  --shadow-2: 0px 3px 1px -2px rgba(0,0,0,0.2),0px 2px 2px 0px rgba(0,0,0,0.14),0px 1px 5px 0px rgba(0,0,0,0.12);
  --font-family: 'Roboto', 'Helvetica', 'Arial', sans-serif;
  --border-radius: 4px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.card {
  background: var(--surface-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-1);
  padding: 24px;
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-sizing: border-box;
  outline: 0;
  border: 0;
  margin: 0;
  border-radius: var(--border-radius);
  padding: 6px 16px;
  cursor: pointer;
  user-select: none;
  vertical-align: middle;
  text-decoration: none;
  color: #fff;
  background-color: var(--primary-color);
  box-shadow: var(--shadow-1);
  font-family: var(--font-family);
  font-weight: 500;
  font-size: 0.875rem;
  line-height: 1.75;
  letter-spacing: 0.02857em;
  text-transform: uppercase;
  transition: background-color 250ms cubic-bezier(0.4, 0, 0.2, 1) 0ms,box-shadow 250ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;
}

.btn:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-2);
}

.input-field {
  width: 100%;
  padding: 16.5px 14px;
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.4375em;
  color: var(--text-primary);
  background: var(--surface-color);
  border: 1px solid var(--divider);
  border-radius: var(--border-radius);
  outline: none;
  transition: border-color 200ms cubic-bezier(0.0, 0, 0.2, 1) 0ms;
}

.input-field:focus {
  border-color: var(--primary-color);
  border-width: 2px;
  padding: 15.5px 13px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-family: var(--font-family);
  font-weight: 400;
  line-height: 1.4375em;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.header {
  background-color: var(--primary-color);
  color: #fff;
  padding: 16px 24px;
  box-shadow: var(--shadow-1);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.0075em;
}

.header-nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.02857em;
}