:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --bg-color: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-light: #64748b;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
}

nav a {
  color: var(--text-light);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--primary);
}

main {
  flex-grow: 1;
}

.hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.calculator-section {
  padding: 2rem 0;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .calculator-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s;
}

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

.result-display {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  min-height: 200px;
}

.placeholder-text {
  color: var(--text-light);
  font-style: italic;
}

.stat-box {
  background: var(--bg-color);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  font-weight: 600;
}

.ad-container {
  margin: 3rem 0;
  text-align: center;
  min-height: 120px;
  background: var(--surface);
  border: 1px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 0.875rem;
}

.content-section {
  padding: 4rem 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.article-body h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.article-body h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
}

.article-body p {
  margin-bottom: 1.25rem;
  color: var(--text);
  font-size: 1.125rem;
}

.site-footer {
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: auto;
  text-align: center;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

@media (min-width: 600px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
  }
}

.site-footer nav a {
  font-size: 0.875rem;
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}