@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Colors: The Palette of Vitality (Emerald Green & Ocean Teal) */
  --primary: #059669; /* Emerald 600 */
  --primary-dim: #047857; /* Emerald 700 */
  --primary-fixed: #065f46; /* Emerald 800 */
  --on-primary: #ffffff;
  
  --secondary: #0284c7; /* Sky / Ocean Teal 600 */
  --secondary-dim: #0369a1; /* Sky 700 */
  --on-secondary: #ffffff;
  
  --surface: #f4f9f6;
  --surface-container-low: #ebf4f0;
  --surface-container: #e2ede8;
  --surface-container-highest: #d1e0d9;
  --surface-container-lowest: #ffffff;
  
  --on-surface: #0f172a; /* Slate 900 */
  --on-surface-variant: #334155; /* Slate 700 */
  --tertiary: #64748b; /* Slate 500 */
  
  --error: #e11d48;
  --error-container: #ffe4e6;
  --on-error-container: #9f1239;
  
  --primary-container: #d1fae5;
  --on-primary-container: #065f46;

  --medium-container: #fef3c7;
  --on-medium-container: #92400e;
  
  --outline-variant: rgba(51, 65, 85, 0.2);
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-family);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

/* Typography Scales */
.display-lg { font-size: 3.5rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
.headline-md { font-size: 1.75rem; font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
.title-md { font-size: 1.125rem; font-weight: 600; line-height: 1.5; }
.body-md { font-size: 1rem; font-weight: 400; line-height: 1.5; color: var(--on-surface-variant); }
.label-md { font-size: 0.875rem; font-weight: 500; letter-spacing: 0.01em; }
.label-sm { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05rem; }

/* The Layering Principle */
.card-lowest {
  background-color: var(--surface-container-lowest);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.card-ambient {
  background-color: var(--surface-container-lowest);
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}

/* Form Primitives */
.clinical-input-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 1.5rem;
}

.clinical-label {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.clinical-input {
  background-color: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: 0.5rem;
  padding: 0.875rem 1.25rem;
  color: var(--on-surface);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.2s ease;
  width: 100%;
  box-sizing: border-box;
}

.clinical-input::placeholder {
  color: var(--tertiary);
  opacity: 0.7;
}

.clinical-input:focus {
  outline: none;
  background-color: var(--surface-container-lowest);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.15);
}

/* Gradients & Buttons */
.btn-primary-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #ffffff;
  border: none;
  border-radius: 0.5rem;
  padding: 1rem 2rem;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn-primary-gradient:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(5, 150, 105, 0.25);
}

.btn-secondary {
  background-color: var(--surface-container-low);
  color: var(--secondary);
  border: none;
  border-radius: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-family: var(--font-family);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background-color: var(--surface-container);
  color: var(--secondary-dim);
}

/* Layout Utilities */
.glass-header {
  background-color: rgba(244, 249, 246, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--outline-variant);
}

/* Tonal Chips */
.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
}

.chip.optimal { background-color: var(--primary-container); color: var(--on-primary-container); }
.chip.moderate { background-color: var(--medium-container); color: var(--on-medium-container); }
.chip.high { background-color: var(--error-container); color: var(--on-error-container); }

/* Utilities */
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.p-0 { padding: 0; }
.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.text-center { text-align: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }