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

:root {
  /* Primary: Teal (Healthcare Trust) */
  --color-primary-50: #F0FDFA;
  --color-primary-100: #CCFBF1;
  --color-primary-200: #99F6E4;
  --color-primary-300: #5EEAD4;
  --color-primary-400: #2DD4BF;
  --color-primary-500: #14B8A6;
  --color-primary-600: #0D9488;
  --color-primary-700: #0F766E;
  --color-primary-800: #115E59;
  --color-primary-900: #134E4A;

  /* Secondary: Blue (Professionalism) */
  --color-secondary-50: #EFF6FF;
  --color-secondary-100: #DBEAFE;
  --color-secondary-500: #3B82F6;
  --color-secondary-600: #2563EB;
  --color-secondary-700: #1D4ED8;

  /* Accent: Warm Amber (Warmth/Energy) */
  --color-accent-50: #FFFBEB;
  --color-accent-100: #FEF3C7;
  --color-accent-500: #F59E0B;
  --color-accent-600: #D97706;

  /* Status Colors */
  --color-success-50: #ECFDF5;
  --color-success-500: #10B981;
  --color-success-600: #059669;
  
  --color-warning-50: #FFFBEB;
  --color-warning-500: #F59E0B;
  --color-warning-600: #D97706;
  
  --color-danger-50: #FEF2F2;
  --color-danger-500: #EF4444;
  --color-danger-600: #DC2626;
  
  --color-info-50: #EFF6FF;
  --color-info-500: #3B82F6;
  --color-info-600: #2563EB;

  /* Neutrals: Slate Scale */
  --color-neutral-50: #FAFAF9;
  --color-neutral-100: #F5F5F4;
  --color-neutral-200: #E7E5E4;
  --color-neutral-300: #D6D3D1;
  --color-neutral-400: #A8A29E;
  --color-neutral-500: #78716C;
  --color-neutral-600: #57534E;
  --color-neutral-700: #44403C;
  --color-neutral-800: #292524;
  --color-neutral-900: #0F172A; /* Text */

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary-600), var(--color-secondary-600));
  --gradient-brand: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-700));

  /* Typography */
  --font-family-base: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Font Sizes */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */

  /* Font Weights */
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
}

/* Reset / Normalize */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family-base);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-neutral-900);
  background-color: var(--color-neutral-50);
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Base Headings & Links */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: 1.2;
  margin-bottom: 0.5em;
  color: var(--color-neutral-900);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

/* Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Components */
/* Cards */
.card {
  background: #ffffff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  border: 1px solid var(--color-neutral-200);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--color-secondary-600);
  color: #ffffff;
}

.btn-secondary:hover {
  background-color: var(--color-secondary-700);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-primary-600);
  color: var(--color-primary-600);
}

.btn-outline:hover {
  background-color: var(--color-primary-50);
}

.btn-danger {
  background-color: var(--color-danger-500);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: var(--color-danger-600);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: 9999px;
  line-height: 1;
}

.badge-success { background: var(--color-success-50); color: var(--color-success-600); }
.badge-warning { background: var(--color-warning-50); color: var(--color-warning-600); }
.badge-danger { background: var(--color-danger-50); color: var(--color-danger-600); }
.badge-info { background: var(--color-info-50); color: var(--color-info-600); }

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--text-sm);
}

.alert-success { background: var(--color-success-50); color: var(--color-success-600); border: 1px solid var(--color-success-500); }
.alert-error { background: var(--color-danger-50); color: var(--color-danger-600); border: 1px solid var(--color-danger-500); }
.alert-warning { background: var(--color-warning-50); color: var(--color-warning-600); border: 1px solid var(--color-warning-500); }
.alert-info { background: var(--color-info-50); color: var(--color-info-600); border: 1px solid var(--color-info-500); }

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-neutral-200);
  padding: 1rem 0;
}

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

.nav-brand {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary-600);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Grid System */
.grid {
  display: grid;
  gap: 1.5rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: 0.5rem;
  color: var(--color-neutral-700);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: var(--text-sm);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--color-neutral-900);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  font-family: var(--font-family-base);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeSlideIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.animate-fade-in { animation: fadeIn var(--transition-normal) forwards; }
.animate-slide-up { animation: slideUp var(--transition-normal) forwards; }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

/* Responsive Breakpoints */
@media (min-width: 480px) {
  .grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .navbar { padding: 1.25rem 0; }
}

@media (min-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}