/* ============================================================
   GLOBAL DESIGN SYSTEM - Unified across all pages
   ============================================================ */

/* ----- CSS VARIABLES: Design Tokens ----- */
:root {
  /* Color Palette */
  --primary: #3042E5;
  --primary-light: #5465ff;
  --primary-lighter: #7A85FF;
  --primary-dark: #2535b7;
  --secondary: #6c757d;
  --success: #28a745;
  --info: #17a2b8;
  --warning: #ffc107;
  --danger: #dc3545;
  
  /* Neutrals */
  --white: #ffffff;
  --light: #f8f9fa;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --dark: #343a40;
  
  /* Backgrounds */
  --body-bg: #f5f7ff;
  --card-bg: #ffffff;
  
  /* Spacing Scale (8px base) */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  
  /* Typography */
  --font-family: 'Poppins', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.7;
  
  /* Border Radius */
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-full: 50px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 15px 50px rgba(48, 66, 229, 0.15);
  --shadow-focus: 0 0 0 3px rgba(48, 66, 229, 0.2);
  
  /* Transitions */
  --transition-fast: all 0.2s ease;
  --transition-base: all 0.3s ease;
  --transition-slow: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  
  /* Breakpoints (for mobile-first approach) */
  --breakpoint-mobile: 480px;
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1024px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--gray-800);
  background-color: var(--body-bg);
  overflow-x: hidden;
}

/* ----- TYPOGRAPHY ----- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
}

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

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

/* ----- BUTTON STYLES ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.8rem 2rem;
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-800);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-200);
  transform: translateY(-3px);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-3px);
}

.btn-text {
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--primary);
}

.btn-text:hover:not(:disabled) {
  color: var(--primary-dark);
}

/* Button Sizes */
.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
}

/* ----- FORM STYLES ----- */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  font-size: 0.95rem;
  color: var(--gray-800);
}

.form-label.required::after {
  content: '*';
  color: var(--danger);
  margin-left: 0.25rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: var(--transition-base);
  background-color: var(--white);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-focus);
}

.form-control:disabled {
  background-color: var(--gray-100);
  color: var(--gray-500);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-control::placeholder {
  color: var(--gray-500);
  opacity: 0.7;
}

/* Input Error State */
.form-control.is-invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-control.is-valid {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

/* Form Helper Text */
.form-text {
  display: block;
  margin-top: 0.25rem;
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

.form-text.error {
  color: var(--danger);
  animation: slideDown 0.3s ease;
}

.form-text.success {
  color: var(--success);
  animation: slideDown 0.3s ease;
}

/* Select & Textarea */
select.form-control,
textarea.form-control {
  padding: 0.75rem 1rem;
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* ----- CARD COMPONENT ----- */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: var(--transition-base);
}

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

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

.card-body {
  margin-bottom: var(--spacing-md);
}

.card-footer {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-200);
}

/* ----- SECTION STYLES ----- */
.section {
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.section-title {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
  color: var(--gray-800);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

/* ----- CONTAINER & LAYOUT ----- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-sm {
  max-width: 600px;
}

.container-md {
  max-width: 900px;
}

.container-lg {
  max-width: 1200px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: calc(var(--spacing-md) * -1);
}

.col {
  flex: 1 1 0%;
  padding: var(--spacing-md);
}

.col-full {
  flex: 0 0 100%;
}

.col-half {
  flex: 0 0 50%;
}

.cols-center {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

/* ----- UTILITY CLASSES ----- */
.text-center {
  text-align: center;
}

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

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

.text-muted {
  color: var(--gray-600);
}

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

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

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

.font-weight-light {
  font-weight: var(--font-weight-normal);
}

.font-weight-normal {
  font-weight: var(--font-weight-normal);
}

.font-weight-medium {
  font-weight: var(--font-weight-medium);
}

.font-weight-semibold {
  font-weight: var(--font-weight-semibold);
}

.font-weight-bold {
  font-weight: var(--font-weight-bold);
}

/* Margin & Padding Utilities */
.m-0 { margin: 0; }
.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* Visibility */
.hidden {
  display: none !important;
}

.invisible {
  visibility: hidden;
}

.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;
}

/* ----- ANIMATIONS ----- */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.fade-in-down {
  animation: fadeInDown 0.6s ease-out;
}

.fade-in-left {
  animation: fadeInLeft 0.6s ease-out;
}

.fade-in-right {
  animation: fadeInRight 0.6s ease-out;
}

.spin-loader {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.pulse-animation {
  animation: pulse 2s ease-in-out infinite;
}

/* ----- RESPONSIVE DESIGN ----- */

/* Tablet Breakpoint (768px) */
@media (max-width: 768px) {
  /* Typography adjustments */
  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.5rem;
  }
  h3 {
    font-size: 1.25rem;
  }
  
  /* Button adjustments */
  .btn {
    padding: 0.7rem 1.5rem;
    font-size: var(--font-size-base);
    min-height: 44px; /* Touch target */
  }
  
  .btn-sm {
    padding: 0.5rem 1rem;
    min-height: 40px;
  }
  
  .btn-lg {
    padding: 0.9rem 2rem;
    min-height: 48px;
  }
  
  .btn-block {
    width: 100%;
  }
  
  /* Form adjustments */
  .form-control {
    padding: 0.75rem 1rem;
    font-size: 16px; /* Prevents zoom on iOS */
    min-height: 44px;
  }
  
  .form-label {
    font-size: 0.9rem;
  }
  
  /* Section padding */
  .section {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  /* Grid adjustments */
  .col-half {
    flex: 0 0 100%;
  }
  
  .row {
    margin: calc(var(--spacing-sm) * -1);
  }
  
  .row > * {
    padding: var(--spacing-sm);
  }
  
  /* Card adjustments */
  .card {
    padding: var(--spacing-md);
  }
}

/* Mobile Breakpoint (480px) */
@media (max-width: 480px) {
  /* Root adjustments */
  :root {
    --font-size-base: 15px;
  }
  
  /* Typography fixes */
  h1 {
    font-size: 1.5rem;
  }
  h2 {
    font-size: 1.25rem;
  }
  h3 {
    font-size: 1.1rem;
  }
  h4 {
    font-size: 1rem;
  }
  
  /* Button adjustments */
  .btn {
    padding: 0.6rem 1.2rem;
    font-size: var(--font-size-sm);
    width: 100%;
  }
  
  .btn-sm {
    padding: 0.5rem 1rem;
  }
  
  .btn-lg {
    padding: 0.8rem 1.5rem;
  }
  
  /* Form adjustments */
  .form-control {
    padding: 0.7rem 0.9rem;
    font-size: 16px; /* Prevents zoom */
  }
  
  .form-label {
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
  }
  
  .form-group {
    margin-bottom: var(--spacing-md);
  }
  
  /* Section padding */
  .section {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .section-title {
    font-size: 1.4rem;
  }
  
  .section-subtitle {
    font-size: 0.95rem;
  }
  
  /* Container padding */
  .container {
    padding: 0 var(--spacing-md);
  }
  
  /* Card adjustments */
  .card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
  }
  
  /* Grid full width */
  .col {
    padding: var(--spacing-xs);
  }
  
  .cols-center {
    gap: var(--spacing-md);
  }
  
  /* Text utilities */
  .text-center {
    text-align: center;
  }
  
  p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
  }
}

/* Large Desktop (1024px+) */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
  
  .section {
    padding: var(--spacing-2xl) var(--spacing-xl);
  }
}

/* ----- ACCESSIBILITY ----- */

/* Focus Visible for keyboard navigation */
*:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  * {
    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: more) {
  :root {
    --primary: #0a1aa8;
    --primary-dark: #020a5c;
    --gray-800: #000000;
    --gray-100: #f5f5f5;
  }
}

/* Light mode (supports dark mode fallback) */
@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
  }
}

/* ----- PRINT STYLES ----- */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .btn, .btn-primary, .btn-secondary {
    border: 1px solid #000;
  }
  
  a {
    text-decoration: underline;
  }
  
  .hidden,
  .sr-only,
  .no-print {
    display: none !important;
  }
}