:root {
  --primary-color: #ffffff;
  --secondary-color: #ffffff;
  --accent-color: #e74c3c;
  --background-color: linear-gradient(180deg, #070707 0%, #e5e7eb 100%);
  --card-background: #000000;
  --text-color: #ffffff;
  --border-color: #4b5563;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --button-gradient: linear-gradient(90deg, #4a4343 0%, #e5e7eb 100%);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Arial", "Helvetica Neue", sans-serif;
}

body {
  min-height: 100vh;
  background: var(--background-color);
  padding: 20px;
  line-height: 1.6;
  color: var(--text-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--card-background);
  padding: 30px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

header.header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

header h1 {
  color: var(--primary-color);
  font-size: 2.2em;
  font-weight: 600;
  margin-bottom: 10px;
}
.header-link {
  color: #007bff; /* Blue color for the link */
  text-decoration: none; /* Remove default underline */
  font-weight: 500; /* Slightly bold for emphasis */
  transition: color 0.3s ease; /* Smooth hover transition */
}

.header-link:hover {
  color: #0056b3; /* Darker blue on hover */
  text-decoration: underline; /* Underline on hover for clarity */
}
.subtitle {
  color: #d1d5db;
  font-size: 1.1em;
  font-style: italic;
}

.input-section {
  margin-bottom: 30px;
}

.groups-container {
  margin-bottom: 20px;
}

.group-input {
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.group-input label {
  font-weight: 500;
  min-width: 100px;
  color: var(--primary-color);
}

.group-values {
  flex: 1;
  padding: 10px;
  border: 2px solid var(--border-color);
  border-radius: 5px;
  font-size: 16px;
  background: #1f2937;
  color: var(--text-color);
  transition: border-color 0.3s ease;
}

.group-values:focus {
  border-color: var(--secondary-color);
  outline: none;
  box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.significance-select {
  padding: 10px 15px;
  border: 2px solid var(--border-color);
  border-radius: 5px;
  font-size: 16px;
  background: #1f2937;
  color: var(--text-color);
  cursor: pointer;
  transition: border-color 0.3s ease;
}

.significance-select:focus {
  border-color: var(--secondary-color);
  outline: none;
  box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.significance-select option {
  background: #1f2937;
  color: var(--text-color);
}

.button-group {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.controls {
  justify-content: space-between;
}

button {
  padding: 12px 25px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.9s ease, background 0.9s ease;
  color: #333333;
  background: var(--button-gradient);
}

button:hover {
  transform: translateY(-2px);
  background: linear-gradient(90deg, #e5e7eb 0%, #ffffff 100%);
}

button:active {
  transform: scale(0.98);
}

button[disabled] {
  background: linear-gradient(90deg, #d1d5db 0%, #9ca3af 100%);
  cursor: not-allowed;
  opacity: 0.6;
}

.error {
  color: var(--accent-color);
  margin-top: 15px;
  padding: 10px;
  border-radius: 5px;
  display: none;
  background-color: #450a0a;
  text-align: center;
}

.results-section {
  margin-top: 40px;
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.results-section.active {
  display: block;
}

.stat-card {
  background: var(--card-background);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--secondary-color);
}

.stat-card h2,
.stat-card h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
  font-weight: 600;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
  background: var(--card-background);
}

th,
td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
}

th {
  background-color: #1f2937;
  color: var(--primary-color);
  font-weight: 600;
}

.significance {
  font-weight: 500;
  color: var(--accent-color);
  margin-top: 10px;
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 15px;
  }

  .group-input {
    flex-direction: column;
    align-items: flex-start;
  }

  .group-input label {
    min-width: auto;
  }

  .button-group {
    flex-direction: column;
    gap: 10px;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .significance-select,
  button {
    width: 100%;
  }
}
.navbar {
  background-color: #000;
  color: #fff;
  margin: 1rem; /* m-4 equivalent */
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: Arial, sans-serif;
  border-radius: 7px;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: bold;
}

.navbar-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: #fff;
  text-decoration: none;
  font-size: 1rem;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: #ddd;
}

.nav-link.active {
  color: #379f51; /* Gold color for active link */
  font-weight: bold;
}

/* Optional: Style for your calculator cards if you want to keep them consistent */
.calculator-selection {
  margin: 1rem;
}