:root {
  --primary-navy: #0F172A;
  --accent-cyan: #0EA5E9;
  --accent-cyan-hover: #0284C7;
  --bg-main: #FFFFFF;
  --bg-surface: #F8FAFC;
  --bg-card: #FFFFFF;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border-light: #E2E8F0;

  --status-normal-bg: #DCFCE7;
  --status-normal-text: #15803D;
  --status-warning-bg: #FEF3C7;
  --status-warning-text: #B45309;
  --status-critical-bg: #FFE4E6;
  --status-critical-text: #E11D48;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-width: 1100px;
  --radius-card: 12px;
  --radius-input: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-surface);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  background: var(--primary-navy);
  color: white;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.brand-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-logo span { color: var(--accent-cyan); }
nav a {
  color: #94A3B8;
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
nav a:hover, nav a.active { color: white; }

.search-wrapper {
  position: relative;
  max-width: var(--max-width);
  margin: 20px auto 0 auto;
  padding: 0 16px;
}
.search-input {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border-radius: var(--radius-input);
  border: 1px solid var(--border-light);
  font-size: 1rem;
  box-shadow: var(--shadow-sm);
}
.search-results {
  position: absolute;
  top: 52px;
  left: 16px;
  right: 16px;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-input);
  box-shadow: var(--shadow-md);
  z-index: 50;
  max-height: 300px;
  overflow-y: auto;
  display: none;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 24px 16px; }
.card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 24px; box-shadow: var(--shadow-md); margin-bottom: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 768px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 600; margin-bottom: 6px; color: var(--primary-navy); }
.input-wrapper { display: flex; align-items: center; gap: 8px; }
input[type="number"], input[type="text"], input[type="email"], input[type="date"], select {
  width: 100%; height: 48px; padding: 0 12px; font-size: 1rem;
  border: 1px solid var(--border-light); border-radius: var(--radius-input);
  background-color: var(--bg-main); color: var(--text-main); transition: border-color 0.15s ease;
}
input:focus, select:focus { outline: 2px solid var(--accent-cyan); border-color: transparent; }

.btn-primary {
  width: 100%; height: 48px; background-color: var(--primary-navy); color: #FFFFFF;
  border: none; border-radius: var(--radius-input); font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: background-color 0.15s ease; display: inline-flex; align-items: center; justify-content: center;
}
.btn-primary:hover { background-color: #1E293B; }

.badge { display: inline-block; padding: 4px 12px; border-radius: 9999px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; }
.badge-normal { background: var(--status-normal-bg); color: var(--status-normal-text); }
.badge-warning { background: var(--status-warning-bg); color: var(--status-warning-text); }
.badge-critical { background: var(--status-critical-bg); color: var(--status-critical-text); }

.gauge-track { width: 100%; height: 10px; background: #E2E8F0; border-radius: 5px; position: relative; margin: 12px 0; overflow: hidden; }
.gauge-fill { height: 100%; transition: width 0.3s ease, background-color 0.3s ease; }

.disclaimer-banner { background: #FFFBEB; border-left: 4px solid #F59E0B; padding: 16px; border-radius: 0 8px 8px 0; font-size: 0.875rem; margin: 24px 0; }
.citation-list { font-size: 0.85rem; color: var(--text-muted); padding-left: 20px; }
.citation-list li { margin-bottom: 6px; }

footer {
  background: var(--primary-navy);
  color: #94A3B8;
  padding: 40px 20px;
  margin-top: 60px;
  font-size: 0.875rem;
}
.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-links a {
  color: #CBD5E1;
  text-decoration: none;
  margin-right: 16px;
}
.footer-links a:hover { color: white; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.tool-card {
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 10px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-cyan);
}
.tool-card h3 {
  margin: 0 0 8px 0;
  color: var(--primary-navy);
  font-size: 1.1rem;
}
.tool-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  flex-grow: 1;
}