/**
 * PROFESSIONAL DESIGN SYSTEM - Dr. Naghme Bahrani Clinic
 * Modern CSS Architecture with Advanced Design Tokens
 * @version 3.0.0
 * @author Lead Technical Director
 */

/* ===== DESIGN TOKENS & CSS CUSTOM PROPERTIES ===== */
:root {
  /* Color System - Medical Professional Palette */
  --color-primary-50: #ecfdf5;
  --color-primary-100: #d1fae5;
  --color-primary-200: #a7f3d0;
  --color-primary-300: #6ee7b7;
  --color-primary-400: #34d399;
  --color-primary-500: #10b981;
  --color-primary-600: #059669;
  --color-primary-700: #047857;
  --color-primary-800: #065f46;
  --color-primary-900: #064e3b;
  --color-primary-950: #022c22;

  /* Secondary Color System - Professional Blues */
  --color-secondary-50: #eff6ff;
  --color-secondary-100: #dbeafe;
  --color-secondary-200: #bfdbfe;
  --color-secondary-300: #93c5fd;
  --color-secondary-400: #60a5fa;
  --color-secondary-500: #3b82f6;
  --color-secondary-600: #2563eb;
  --color-secondary-700: #1d4ed8;
  --color-secondary-800: #1e40af;
  --color-secondary-900: #1e3a8a;
  --color-secondary-950: #172554;

  /* Accent Color System - Warm Golds */
  --color-accent-50: #fffbeb;
  --color-accent-100: #fef3c7;
  --color-accent-200: #fde68a;
  --color-accent-300: #fcd34d;
  --color-accent-400: #fbbf24;
  --color-accent-500: #f59e0b;
  --color-accent-600: #d97706;
  --color-accent-700: #b45309;
  --color-accent-800: #92400e;
  --color-accent-900: #78350f;
  --color-accent-950: #451a03;

  /* Neutral Color System */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;

  /* Semantic Colors */
  --color-success: var(--color-primary-600);
  --color-warning: var(--color-accent-500);
  --color-error: #dc2626;
  --color-info: var(--color-secondary-500);

  /* Surface Colors */
  --color-surface: #ffffff;
  --color-surface-secondary: var(--color-neutral-50);
  --color-surface-tertiary: var(--color-neutral-100);
  --color-background: #ffffff;
  --color-background-secondary: var(--color-neutral-50);

  /* Text Colors */
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-700);
  --color-text-tertiary: var(--color-neutral-500);
  --color-text-inverse: #ffffff;

  /* Border Colors */
  --color-border-primary: var(--color-neutral-200);
  --color-border-secondary: var(--color-neutral-300);
  --color-border-focus: var(--color-primary-500);

  /* Typography Scale - Perfect Fourth (1.333) */
  --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 */
  --font-size-7xl: 4.5rem;      /* 72px */

  /* Font Weights */
  --font-weight-thin: 100;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  /* Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Letter Spacing */
  --letter-spacing-tighter: -0.05em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;

  /* Spacing Scale - Perfect Fourth (1.333) */
  --space-0: 0;
  --space-px: 1px;
  --space-0-5: 0.125rem;    /* 2px */
  --space-1: 0.25rem;       /* 4px */
  --space-1-5: 0.375rem;    /* 6px */
  --space-2: 0.5rem;        /* 8px */
  --space-2-5: 0.625rem;    /* 10px */
  --space-3: 0.75rem;       /* 12px */
  --space-3-5: 0.875rem;    /* 14px */
  --space-4: 1rem;          /* 16px */
  --space-5: 1.25rem;       /* 20px */
  --space-6: 1.5rem;        /* 24px */
  --space-7: 1.75rem;       /* 28px */
  --space-8: 2rem;          /* 32px */
  --space-9: 2.25rem;       /* 36px */
  --space-10: 2.5rem;       /* 40px */
  --space-11: 2.75rem;      /* 44px */
  --space-12: 3rem;         /* 48px */
  --space-14: 3.5rem;       /* 56px */
  --space-16: 4rem;         /* 64px */
  --space-20: 5rem;         /* 80px */
  --space-24: 6rem;         /* 96px */
  --space-28: 7rem;         /* 112px */
  --space-32: 8rem;         /* 128px */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;     /* 2px */
  --radius-base: 0.25rem;    /* 4px */
  --radius-md: 0.375rem;     /* 6px */
  --radius-lg: 0.5rem;       /* 8px */
  --radius-xl: 0.75rem;      /* 12px */
  --radius-2xl: 1rem;        /* 16px */
  --radius-3xl: 1.5rem;      /* 24px */
  --radius-full: 9999px;

  /* Shadows - Layered System */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-base: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-2xl: 0 50px 100px -20px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* Colored Shadows */
  --shadow-primary: 0 10px 15px -3px rgb(16 185 129 / 0.1), 0 4px 6px -4px rgb(16 185 129 / 0.1);
  --shadow-secondary: 0 10px 15px -3px rgb(59 130 246 / 0.1), 0 4px 6px -4px rgb(59 130 246 / 0.1);
  --shadow-accent: 0 10px 15px -3px rgb(245 158 11 / 0.1), 0 4px 6px -4px rgb(245 158 11 / 0.1);

  /* Transitions & Animations */
  --transition-none: none;
  --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-default: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-colors: color 150ms cubic-bezier(0.4, 0, 0.2, 1), background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), border-color 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-opacity: opacity 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-shadow: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-transform: transform 150ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Custom Easing Functions */
  --ease-linear: linear;
  --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);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Z-Index Scale */
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-auto: auto;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* Breakpoints (for JavaScript usage) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* Container Sizes */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* Grid System */
  --grid-columns: 12;
  --grid-gap: var(--space-6);
  --grid-gap-sm: var(--space-4);
  --grid-gap-lg: var(--space-8);
}

/* ===== ADVANCED GRADIENT SYSTEM ===== */
:root {
  /* Primary Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
  --gradient-primary-soft: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-primary-100) 100%);
  --gradient-primary-vibrant: linear-gradient(135deg, var(--color-primary-400) 0%, var(--color-primary-700) 100%);

  /* Secondary Gradients */
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary-500) 0%, var(--color-secondary-600) 100%);
  --gradient-secondary-soft: linear-gradient(135deg, var(--color-secondary-50) 0%, var(--color-secondary-100) 100%);

  /* Mixed Gradients */
  --gradient-primary-secondary: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 100%);
  --gradient-primary-accent: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-accent-500) 100%);

  /* Radial Gradients */
  --gradient-radial-primary: radial-gradient(circle at center, var(--color-primary-500) 0%, var(--color-primary-700) 100%);
  --gradient-radial-soft: radial-gradient(circle at center, var(--color-neutral-50) 0%, var(--color-neutral-100) 100%);

  /* Glass Morphism */
  --glass-background: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-backdrop: blur(20px);
}

/* ===== COMPONENT TOKENS ===== */
:root {
  /* Button Tokens */
  --button-height-sm: 2rem;
  --button-height-base: 2.5rem;
  --button-height-lg: 3rem;
  --button-height-xl: 3.5rem;
  --button-padding-x-sm: var(--space-3);
  --button-padding-x-base: var(--space-4);
  --button-padding-x-lg: var(--space-6);
  --button-padding-x-xl: var(--space-8);

  /* Card Tokens */
  --card-padding: var(--space-6);
  --card-padding-sm: var(--space-4);
  --card-padding-lg: var(--space-8);
  --card-radius: var(--radius-xl);
  --card-shadow: var(--shadow-md);

  /* Form Tokens */
  --form-element-height: 2.75rem;
  --form-element-padding-x: var(--space-3);
  --form-element-radius: var(--radius-md);
  --form-element-border-width: 1px;

  /* Navigation Tokens */
  --nav-height: 4rem;
  --nav-padding-x: var(--space-6);
  --nav-item-padding-x: var(--space-4);
  --nav-item-padding-y: var(--space-2);
}

/* ===== MODERN CSS RESET ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: 'Vazirmatn', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  direction: rtl;
  text-align: right;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
@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;
  }
}

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

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

/* ===== UTILITY CLASSES ===== */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

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

@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

@media (min-width: 1536px) {
  .container {
    max-width: var(--container-2xl);
  }
}

/* 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)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

/* Spacing Utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

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

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.font-extrabold { font-weight: var(--font-weight-extrabold); }

/* Color Utilities */
.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-secondary-600); }
.text-accent { color: var(--color-accent-600); }
.text-neutral { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-tertiary); }

.bg-primary { background-color: var(--color-primary-600); }
.bg-secondary { background-color: var(--color-secondary-600); }
.bg-accent { background-color: var(--color-accent-600); }
.bg-surface { background-color: var(--color-surface); }
.bg-surface-secondary { background-color: var(--color-surface-secondary); }

/* Border Utilities */
.border { border: 1px solid var(--color-border-primary); }
.border-2 { border: 2px solid var(--color-border-primary); }
.border-primary { border-color: var(--color-primary-600); }
.border-secondary { border-color: var(--color-secondary-600); }

.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow Utilities */
.shadow { box-shadow: var(--shadow-base); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }
.shadow-primary { box-shadow: var(--shadow-primary); }
.shadow-secondary { box-shadow: var(--shadow-secondary); }

/* Responsive Design Utilities */
@media (min-width: 640px) {
  .sm\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sm\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .sm\:text-lg { font-size: var(--font-size-lg); }
  .sm\:text-xl { font-size: var(--font-size-xl); }
  .sm\:text-2xl { font-size: var(--font-size-2xl); }
}

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

@media (min-width: 1024px) {
  .lg\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .lg\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .lg\:text-2xl { font-size: var(--font-size-2xl); }
  .lg\:text-3xl { font-size: var(--font-size-3xl); }
  .lg\:text-4xl { font-size: var(--font-size-4xl); }
}