/* ===================================
   MERIDIAN ENDODONTICS STYLE GUIDE
   Research-Based Design System
   =================================== */

/* ===================================
   1. COLOR SYSTEM (Trust & Professionalism)
   =================================== */
:root {
  /* Primary Colors - Trust & Professionalism */
  --color-primary: #1E3A8A;        /* Deep Blue - Trust, reliability */
  --color-primary-light: #3B82F6;   /* Light Blue - Interactive elements */
  --color-primary-dark: #1E40AF;    /* Darker Blue - Active states */

  /* Secondary Colors - Professional & Modern */
  --color-secondary: #0D9488;      /* Teal - Innovation, health */
  --color-secondary-light: #14B8A6; /* Light Teal - Highlights */
  --color-accent: #F59E0B;         /* Gold - Premium service, quality */

  /* Neutral Palette - Clean & Professional */
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;        /* Lightest background */
  --color-gray-100: #F3F4F6;       /* Light backgrounds */
  --color-gray-200: #E5E7EB;       /* Borders, dividers */
  --color-gray-300: #D1D5DB;       /* Light borders */
  --color-gray-500: #6B7280;       /* Muted text */
  --color-gray-700: #374151;       /* Body text */
  --color-gray-900: #111827;       /* Headings, important text */

  /* Medical/Semantic Colors */
  --color-success: #10B981;         /* Positive outcomes */
  --color-warning: #F59E0B;         /* Caution, attention */
  --color-error: #EF4444;           /* Emergency, critical */
  --color-info: #3B82F6;            /* Informational */

  /* Background Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
  --gradient-hero: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, var(--color-secondary) 100%);
  --gradient-trust: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
}

/* ===================================
   2. TYPOGRAPHY SYSTEM (Medical Standards)
   =================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Montserrat:wght@400;500;600;700&display=swap');

/* Font Stack */
:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', sans-serif;
  --font-secondary: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

/* Typography Scale & Line Heights */
:root {
  --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 */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */

  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
}

/* Responsive Typography */
h1 {
  font-family: var(--font-secondary);
  font-size: clamp(var(--text-2xl), 4vw, var(--text-5xl));
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-gray-900);
}

h2 {
  font-family: var(--font-secondary);
  font-size: clamp(var(--text-xl), 3vw, var(--text-4xl));
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-gray-900);
}

h3 {
  font-family: var(--font-primary);
  font-size: clamp(var(--text-lg), 2.5vw, var(--text-2xl));
  font-weight: var(--font-semibold);
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
}

h4 {
  font-family: var(--font-primary);
  font-size: clamp(var(--text-base), 2vw, var(--text-xl));
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  color: var(--color-gray-700);
}

p, body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-relaxed);
  color: var(--color-gray-700);
}

.small {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* ===================================
   3. SPACING SYSTEM (8pt Grid)
   =================================== */
:root {
  --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 */
}

/* ===================================
   4. RESPONSIVE BREAKPOINTS
   =================================== */
:root {
  --breakpoint-sm: 640px;    /* Mobile large */
  --breakpoint-md: 768px;    /* Tablet */
  --breakpoint-lg: 1024px;   /* Tablet large/Desktop small */
  --breakpoint-xl: 1280px;   /* Desktop */
  --breakpoint-2xl: 1536px;  /* Desktop large */
}

/* Container Widths */
.container {
  width: 100%;
  padding: 0 var(--space-4);
  margin: 0 auto;
}

@media (min-width: 640px) {
  .container {
    max-width: 640px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
    padding: 0 var(--space-6);
  }
}

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

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

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

/* ===================================
   5. COMPONENT SYSTEM
   =================================== */

/* Buttons - Medical Professional */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-decoration: none;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: 0 4px 6px rgba(30, 58, 138, 0.1);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 12px rgba(30, 58, 138, 0.15);
}

.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--color-white);
  box-shadow: 0 4px 6px rgba(13, 148, 136, 0.1);
}

.btn-secondary:hover {
  background: var(--color-secondary);
  transform: translateY(-1px);
  box-shadow: 0 6px 12px rgba(13, 148, 136, 0.15);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-gray-200);
}

.btn-ghost:hover {
  background: var(--color-gray-50);
  border-color: var(--color-primary);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* Cards - Professional Medical Cards */
.card {
  background: var(--color-white);
  border-radius: 0.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  padding: var(--space-6);
  transition: all 0.2s ease-in-out;
  border: 1px solid var(--color-gray-100);
}

.card:hover {
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

.card-header {
  border-bottom: 1px solid var(--color-gray-200);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
}

/* Form Elements - Medical Professional */
.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-300);
  border-radius: 0.5rem;
  font-family: var(--font-primary);
  font-size: var(--text-base);
  transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-input:invalid {
  border-color: var(--color-error);
}

/* Alerts - Medical Communication */
.alert {
  padding: var(--space-4) var(--space-6);
  border-radius: 0.5rem;
  margin-bottom: var(--space-4);
  border-left: 4px solid;
}

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--color-info);
  color: var(--color-primary);
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: #065f46;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
  color: #92400e;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: #991b1b;
}

/* Navigation - Medical Professional */
.nav-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.95);
}

.nav-link {
  color: var(--color-gray-700);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: 0.375rem;
  transition: all 0.2s ease-in-out;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-gray-50);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: var(--font-medium);
}

/* ===================================
   6. MOBILE-FIRST RESPONSIVE UTILITIES
   =================================== */

/* Mobile Hidden (default visible on mobile) */
.mobile-hidden {
  display: none;
}

/* Tablet and up */
@media (min-width: 768px) {
  .mobile-hidden {
    display: block;
  }

  .mobile-only {
    display: none;
  }

  .tablet-hidden {
    display: none;
  }
}

/* Desktop and up */
@media (min-width: 1024px) {
  .tablet-only {
    display: none;
  }

  .desktop-hidden {
    display: none;
  }
}

/* Large Desktop and up */
@media (min-width: 1280px) {
  .desktop-only {
    display: none;
  }
}

/* ===================================
   7. ACCESSIBILITY (WCAG 2.1 AA)
   =================================== */

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

/* Skip Links */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 100;
}

.skip-link:focus {
  top: 6px;
}

/* 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: 0;
}

/* 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 */
@media (prefers-contrast: high) {
  :root {
    --color-gray-500: var(--color-gray-700);
    --color-gray-200: var(--color-gray-300);
  }
}

/* ===================================
   8. UTILITY CLASSES
   =================================== */

/* Spacing */
.m-0 { margin: 0; }
.p-0 { padding: 0; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-6 { margin-bottom: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-12 { margin-bottom: var(--space-12); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-700 { color: var(--color-gray-700); }
.text-white { color: var(--color-white); }

/* Font Weights */
.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

/* Display */
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.hidden { display: none; }

/* Flexbox */
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

/* Border */
.rounded { border-radius: 0.25rem; }
.rounded-md { border-radius: 0.375rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }

/* Shadow */
.shadow-sm { box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05); }
.shadow { box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06); }
.shadow-md { box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06); }
.shadow-lg { box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05); }
.shadow-xl { box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04); }

/* Background */
.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }

/* ===================================
   9. COMPONENT VARIANTS
   =================================== */

/* Hero Section */
.hero {
  background: var(--gradient-hero);
  color: var(--color-white);
  padding: var(--space-16) 0;
  text-align: center;
}

/* Service Cards */
.service-card {
  background: var(--color-white);
  border-radius: 1rem;
  padding: var(--space-8);
  text-align: center;
  transition: all 0.3s ease-in-out;
  border: 1px solid var(--color-gray-100);
  height: 100%;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.service-icon {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}

/* Testimonial Card */
.testimonial-card {
  background: var(--gradient-trust);
  border-radius: 1rem;
  padding: var(--space-8);
  position: relative;
}

.testimonial-card::before {
  content: """;
  position: absolute;
  top: -1rem;
  left: 2rem;
  font-size: var(--text-6xl);
  color: var(--color-secondary);
  opacity: 0.3;
}

/* CTA Section */
.cta {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--space-16) 0;
  text-align: center;
}

/* ===================================
   10. DARK MODE SUPPORT (Future Enhancement)
   =================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --color-white: #1F2937;
    --color-gray-50: #374151;
    --color-gray-100: #4B5563;
    --color-gray-200: #6B7280;
    --color-gray-700: #D1D5DB;
    --color-gray-900: #F9FAFB;
  }
}

/* ===================================
   11. PRINT STYLES
   =================================== */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  .no-print {
    display: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  .btn {
    border: 1px solid black;
  }
}