/*
 * Cure Plus Pharmacy - Main Stylesheet
 * Modern, accessible, mobile-first design system
 */

/* ==========================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================== */

:root {
  /* Colors - Primary */
  --color-primary-blue: #0066CC;
  --color-primary-blue-dark: #0052A3;
  --color-primary-blue-light: #E6F2FF;
  
  /* Colors - Secondary */
  --color-secondary-green: #00B67A;
  --color-secondary-green-dark: #009460;
  --color-secondary-green-light: #E6F9F3;
  
  /* Colors - Accent */
  --color-accent-orange: #FF6B35;
  --color-accent-orange-dark: #E55A2B;
  --color-accent-orange-light: #FFE8E0;
  
  /* Colors - Neutral Palette */
  --color-gray-900: #1A202C;
  --color-gray-800: #2D3748;
  --color-gray-700: #4A5568;
  --color-gray-600: #718096;
  --color-gray-500: #A0AEC0;
  --color-gray-400: #CBD5E0;
  --color-gray-300: #E2E8F0;
  --color-gray-200: #EDF2F7;
  --color-gray-100: #F7FAFC;
  --color-white: #FFFFFF;
  
  /* Colors - Semantic */
  --color-success: #00B67A;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
  
  /* Typography - Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
  
  /* Typography - Font Sizes */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  
  /* Typography - Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Typography - Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Spacing Scale (8px base unit) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */
  
  /* Section Spacing */
  --section-padding-mobile: var(--space-12);
  --section-padding-tablet: var(--space-16);
  --section-padding-desktop: var(--space-20);
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  
  /* Grid */
  --grid-gap: var(--space-6);
  
  /* Border Radius */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-base: 0.5rem;   /* 8px */
  --radius-md: 0.75rem;    /* 12px */
  --radius-lg: 1rem;       /* 16px */
  --radius-xl: 1.5rem;     /* 24px */
  --radius-full: 9999px;   /* Pill shape */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;
  
  /* Easing Functions */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-Index Scale */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */

/* Box sizing reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Remove default margins and padding */
* {
  margin: 0;
  padding: 0;
}

/* HTML & Body */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

h6 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

@media (min-width: 768px) {
  h1 {
    font-size: var(--font-size-5xl);
  }
  
  h2 {
    font-size: var(--font-size-4xl);
  }
}

p {
  margin-bottom: var(--space-4);
}

.lead {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-700);
}

small, .small {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

strong, b {
  font-weight: var(--font-weight-semibold);
}

/* Links */
a {
  color: var(--color-primary-blue);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary-blue-dark);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary-blue);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Remove button default styles */
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ==========================================
   LAYOUT UTILITIES
   ========================================== */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

.container-sm {
  max-width: var(--container-sm);
}

.container-md {
  max-width: var(--container-md);
}

.container-lg {
  max-width: var(--container-lg);
}

.container-2xl {
  max-width: var(--container-2xl);
}

/* Section Spacing */
.section {
  padding-top: var(--section-padding-mobile);
  padding-bottom: var(--section-padding-mobile);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--section-padding-tablet);
    padding-bottom: var(--section-padding-tablet);
  }
}

@media (min-width: 1024px) {
  .section {
    padding-top: var(--section-padding-desktop);
    padding-bottom: var(--section-padding-desktop);
  }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (min-width: 768px) {
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .md\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

/* Text Utilities */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* Color Utilities */
.text-primary {
  color: var(--color-primary-blue);
}

.text-success {
  color: var(--color-success);
}

.text-error {
  color: var(--color-error);
}

.bg-gray-100 {
  background-color: var(--color-gray-100);
}

.bg-primary-light {
  background-color: var(--color-primary-blue-light);
}

/* Spacing Utilities */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ==========================================
   ACCESSIBILITY
   ========================================== */

/* Skip to main content link */
.skip-to-content {
  position: absolute;
  left: -9999px;
  z-index: var(--z-tooltip);
  padding: var(--space-4);
  background: var(--color-primary-blue);
  color: var(--color-white);
  text-decoration: none;
  border-radius: var(--radius-base);
}

.skip-to-content:focus {
  left: var(--space-4);
  top: var(--space-4);
}

/* Screen reader only */
.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;
}

/* Focus visible styles */
:focus-visible {
  outline: 2px solid var(--color-primary-blue);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-primary-blue: #0052A3;
    --color-gray-600: #4A5568;
  }
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in {
  animation: fadeIn 0.5s var(--ease-out);
}

.slide-up {
  animation: slideUp 0.5s var(--ease-out);
}

.slide-down {
  animation: slideDown 0.5s var(--ease-out);
}

.scale-in {
  animation: scaleIn 0.3s var(--ease-out);
}

/* ==========================================
   PRINT STYLES
   ========================================== */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  a,
  a:visited {
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
  }
  
  img {
    page-break-inside: avoid;
  }
  
  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }
  
  h2,
  h3 {
    page-break-after: avoid;
  }
  
  .no-print {
    display: none !important;
  }
}