/* ===== CSS VARIABLES ===== */
:root {
  /* Color System */
  --primary-color: #2c3e50;
  --secondary-color: #34495e;
  --accent-color: #3498db;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --light-color: #ecf0f1;
  --dark-color: #2c3e50;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f2f6;
  --gray-200: #dfe4ea;
  --gray-300: #ced6e0;
  --gray-400: #a4b0be;
  --gray-500: #747d8c;
  --gray-600: #57606f;
  --gray-700: #2f3542;
  --gray-800: #1e272e;
  --gray-900: #0c0c0c;
  
  /* Typography */
  --font-primary: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-secondary: 'Poppins', 'Arial', sans-serif;
  --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 */
  
  /* Spacing Scale (8px base) */
  --space-0: 0;
  --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 */
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-pill: 50rem;
  
  /* Shadows */
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== TYPOGRAPHY SYSTEM ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-4);
  color: var(--dark-color);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  font-size: var(--font-size-3xl);
  line-height: 1.25;
}

h3 {
  font-size: var(--font-size-2xl);
  line-height: 1.3;
}

h4 {
  font-size: var(--font-size-xl);
  line-height: 1.4;
}

h5 {
  font-size: var(--font-size-lg);
  line-height: 1.5;
}

h6 {
  font-size: var(--font-size-base);
  line-height: 1.6;
}

p {
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: all var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--secondary-color);
}

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

/* Responsive Container Widths */
@media (min-width: 576px) {
  .container {
    max-width: 540px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}

@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
}

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

/* ===== HEADER COMPONENT ===== */
.header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--white);
  padding: var(--space-3) 0;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

/* Logo Component */
.logo {
  flex-shrink: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  transition: transform var(--transition-normal);
}

.logo-link:hover {
  transform: translateY(-1px);
}

.logo-icon {
  font-size: var(--font-size-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--white);
}

.logo-slogan {
  font-size: var(--font-size-xs);
  opacity: 0.9;
  font-weight: 400;
  color: var(--gray-300);
}

/* ===== NAVIGATION COMPONENT ===== */
.navigation {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-1);
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--white);
  text-decoration: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  font-weight: 500;
  opacity: 0.9;
  position: relative;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus {
  background: rgba(255, 255, 255, 0.1);
  opacity: 1;
  transform: translateY(-1px);
  color: var(--white);
}

.nav-item.active .nav-link {
  background: rgba(255, 255, 255, 0.15);
  opacity: 1;
  font-weight: 600;
}

/* ===== MAIN CONTENT LAYOUT ===== */
.main-content {
  flex: 1;
  min-height: 70vh;
  padding: var(--space-8) 0;
  background: var(--white);
}

/* ===== FOOTER COMPONENT ===== */
.footer {
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
  color: var(--white);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: auto;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
  align-items: start;
}

.footer-section h3 {
  color: var(--white);
  margin-bottom: var(--space-5);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--white);
}

.footer-description {
  opacity: 0.9;
  line-height: 1.6;
  margin-bottom: var(--space-5);
  color: var(--gray-300);
  font-size: var(--font-size-sm);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--gray-300);
  text-decoration: none;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  padding: var(--space-1) 0;
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--white);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-6);
  text-align: center;
  opacity: 0.8;
  color: var(--gray-300);
  font-size: var(--font-size-sm);
}

.footer-links-bottom {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.footer-links-bottom a {
  color: var(--gray-300);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-size: var(--font-size-sm);
}

.footer-links-bottom a:hover {
  color: var(--white);
}

/* ===== COMPREHENSIVE UTILITY CLASSES ===== */

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

/* Display */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }
.d-inline-grid { display: inline-grid !important; }

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

/* Spacing - Margin */
.m-0 { margin: var(--space-0) !important; }
.m-1 { margin: var(--space-1) !important; }
.m-2 { margin: var(--space-2) !important; }
.m-3 { margin: var(--space-3) !important; }
.m-4 { margin: var(--space-4) !important; }
.m-5 { margin: var(--space-5) !important; }
.m-6 { margin: var(--space-6) !important; }
.m-8 { margin: var(--space-8) !important; }

.mt-0 { margin-top: var(--space-0) !important; }
.mt-1 { margin-top: var(--space-1) !important; }
.mt-2 { margin-top: var(--space-2) !important; }
.mt-3 { margin-top: var(--space-3) !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-5 { margin-top: var(--space-5) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mt-8 { margin-top: var(--space-8) !important; }

.mb-0 { margin-bottom: var(--space-0) !important; }
.mb-1 { margin-bottom: var(--space-1) !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.mb-3 { margin-bottom: var(--space-3) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-5 { margin-bottom: var(--space-5) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }

/* Spacing - Padding */
.p-0 { padding: var(--space-0) !important; }
.p-1 { padding: var(--space-1) !important; }
.p-2 { padding: var(--space-2) !important; }
.p-3 { padding: var(--space-3) !important; }
.p-4 { padding: var(--space-4) !important; }
.p-5 { padding: var(--space-5) !important; }
.p-6 { padding: var(--space-6) !important; }
.p-8 { padding: var(--space-8) !important; }

.pt-0 { padding-top: var(--space-0) !important; }
.pt-1 { padding-top: var(--space-1) !important; }
.pt-2 { padding-top: var(--space-2) !important; }
.pt-3 { padding-top: var(--space-3) !important; }
.pt-4 { padding-top: var(--space-4) !important; }
.pt-5 { padding-top: var(--space-5) !important; }
.pt-6 { padding-top: var(--space-6) !important; }
.pt-8 { padding-top: var(--space-8) !important; }

.pb-0 { padding-bottom: var(--space-0) !important; }
.pb-1 { padding-bottom: var(--space-1) !important; }
.pb-2 { padding-bottom: var(--space-2) !important; }
.pb-3 { padding-bottom: var(--space-3) !important; }
.pb-4 { padding-bottom: var(--space-4) !important; }
.pb-5 { padding-bottom: var(--space-5) !important; }
.pb-6 { padding-bottom: var(--space-6) !important; }
.pb-8 { padding-bottom: var(--space-8) !important; }

/* Width & Height */
.w-25 { width: 25% !important; }
.w-50 { width: 50% !important; }
.w-75 { width: 75% !important; }
.w-100 { width: 100% !important; }
.w-auto { width: auto !important; }

.h-25 { height: 25% !important; }
.h-50 { height: 50% !important; }
.h-75 { height: 75% !important; }
.h-100 { height: 100% !important; }
.h-auto { height: auto !important; }

/* Colors */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-accent { color: var(--accent-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-light { color: var(--light-color) !important; }
.text-dark { color: var(--dark-color) !important; }
.text-white { color: var(--white) !important; }
.text-muted { color: var(--gray-600) !important; }

/* Backgrounds */
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-accent { background-color: var(--accent-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-light { background-color: var(--light-color) !important; }
.bg-dark { background-color: var(--dark-color) !important; }
.bg-white { background-color: var(--white) !important; }
.bg-transparent { background-color: transparent !important; }

/* ===== ACCESSIBILITY ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--space-4);
  background: var(--accent-color);
  color: var(--white);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-normal);
  font-weight: 500;
}

.skip-link:focus {
  top: var(--space-4);
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

/* Focus styles */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 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 support */
@media (prefers-contrast: high) {
  :root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --accent-color: #0066cc;
    --gray-50: #ffffff;
    --gray-100: #ffffff;
    --gray-200: #000000;
    --gray-300: #000000;
    --gray-400: #000000;
    --gray-500: #000000;
    --gray-600: #000000;
    --gray-700: #000000;
    --gray-800: #000000;
    --gray-900: #000000;
  }
}

/* ===== LOADING STATES ===== */
.loading {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--gray-300);
  border-top: 2px solid var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== RESPONSIVE BREAKPOINTS ===== */

/* Extra small devices (portrait phones) */
@media (max-width: 575.98px) {
  .header-inner {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .navigation {
    width: 100%;
    justify-content: center;
  }
  
  .nav-menu {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .footer-sections {
    grid-template-columns: 1fr;
  }
  
  .footer-links-bottom {
    flex-direction: column;
    gap: var(--space-3);
  }
}

/* Small devices (landscape phones) */
@media (max-width: 767.98px) {
  .main-content {
    padding: var(--space-6) 0;
  }
  
  .footer {
    padding: var(--space-8) 0 var(--space-6);
  }
}

/* Medium devices (tablets) */
@media (max-width: 991.98px) {
  .nav-menu {
    gap: var(--space-0);
  }
  
  .nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .header,
  .footer,
  .skip-link,
  .nav-menu {
    display: none !important;
  }
  
  .main-content {
    padding: 0 !important;
    margin: 0 !important;
  }
  
  body {
    background: white !important;
    color: black !important;
    font-size: 12pt;
    line-height: 1.4;
  }
  
  a {
    color: black !important;
    text-decoration: underline !important;
  }
  
  .container {
    max-width: none !important;
    padding: 0 !important;
  }
}