:root {
  --color-primary: #20B2AA;
  --color-accent: #059669;
  --color-bg: #F9FAFB;
  --color-text: #1F2937;
  --color-border: #D1D5DB;
  --color-button: #20B2AA;
  --color-button-text: #FFFFFF;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
}

.site-header {
  background-color: var(--color-primary);
  color: white;
  padding: 0.5rem 0;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header .logo a {
  color: white;
  font-size: 1.25rem;
  text-decoration: none;
  font-weight: bold;
}

.site-header .nav-links a {
  color: white;
  margin-left: 1rem;
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header .nav-links a:hover {
  text-decoration: underline;
}

.tool-container {
  max-width: 900px;
  margin: 2rem auto;
  background: white;
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.tool-container h2 {
  margin-top: 0;
  font-size: 1.5rem;
  color: var(--color-primary);
}

textarea, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 0.75rem;
  margin: 0.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
}

button {
  background-color: var(--color-button);
  color: var(--color-button-text);
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  margin-top: 0.5rem;
}

button:hover {
  background-color: #1E40AF;
}

.site-footer {
  background-color: var(--color-primary);
  color: white;
  text-align: center;
  padding: 0.75rem 0;
  margin-top: 2rem;
  font-size: 0.85rem;
}