/* Investment Learning Hub - Main Stylesheet */
/* Mobile-first responsive design with Bootstrap 5-style grid system */

:root {
  /* Color Variables for Financial Platform */
  --primary-color: #2563eb;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --danger-color: #dc2626;
  --dark-color: #1f2937;
  --light-color: #f8fafc;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --success-color: #059669;
  
  /* Typography */
  --font-family-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-size-base: 1rem;
  --line-height-base: 1.5;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-primary);
  background-color: #ffffff;
  overflow-x: hidden;
}

/* Bootstrap 5-style Grid System */
.container {
  width: 100%;
  padding-right: var(--spacing-md);
  padding-left: var(--spacing-md);
  margin-right: auto;
  margin-left: auto;
}

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

/* Container max-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;
  }
}

/* Row and Column System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: calc(var(--spacing-md) * -0.5);
  margin-left: calc(var(--spacing-md) * -0.5);
}

.col {
  flex: 1 0 0%;
  padding-right: calc(var(--spacing-md) * 0.5);
  padding-left: calc(var(--spacing-md) * 0.5);
}

/* Column sizes */
.col-1 { flex: 0 0 auto; width: 8.33333333%; }
.col-2 { flex: 0 0 auto; width: 16.66666667%; }
.col-3 { flex: 0 0 auto; width: 25%; }
.col-4 { flex: 0 0 auto; width: 33.33333333%; }
.col-5 { flex: 0 0 auto; width: 41.66666667%; }
.col-6 { flex: 0 0 auto; width: 50%; }
.col-7 { flex: 0 0 auto; width: 58.33333333%; }
.col-8 { flex: 0 0 auto; width: 66.66666667%; }
.col-9 { flex: 0 0 auto; width: 75%; }
.col-10 { flex: 0 0 auto; width: 83.33333333%; }
.col-11 { flex: 0 0 auto; width: 91.66666667%; }
.col-12 { flex: 0 0 auto; width: 100%; }

/* Responsive column classes */
@media (min-width: 576px) {
  .col-sm-1 { flex: 0 0 auto; width: 8.33333333%; }
  .col-sm-2 { flex: 0 0 auto; width: 16.66666667%; }
  .col-sm-3 { flex: 0 0 auto; width: 25%; }
  .col-sm-4 { flex: 0 0 auto; width: 33.33333333%; }
  .col-sm-5 { flex: 0 0 auto; width: 41.66666667%; }
  .col-sm-6 { flex: 0 0 auto; width: 50%; }
  .col-sm-7 { flex: 0 0 auto; width: 58.33333333%; }
  .col-sm-8 { flex: 0 0 auto; width: 66.66666667%; }
  .col-sm-9 { flex: 0 0 auto; width: 75%; }
  .col-sm-10 { flex: 0 0 auto; width: 83.33333333%; }
  .col-sm-11 { flex: 0 0 auto; width: 91.66666667%; }
  .col-sm-12 { flex: 0 0 auto; width: 100%; }
}

@media (min-width: 768px) {
  .col-md-1 { flex: 0 0 auto; width: 8.33333333%; }
  .col-md-2 { flex: 0 0 auto; width: 16.66666667%; }
  .col-md-3 { flex: 0 0 auto; width: 25%; }
  .col-md-4 { flex: 0 0 auto; width: 33.33333333%; }
  .col-md-5 { flex: 0 0 auto; width: 41.66666667%; }
  .col-md-6 { flex: 0 0 auto; width: 50%; }
  .col-md-7 { flex: 0 0 auto; width: 58.33333333%; }
  .col-md-8 { flex: 0 0 auto; width: 66.66666667%; }
  .col-md-9 { flex: 0 0 auto; width: 75%; }
  .col-md-10 { flex: 0 0 auto; width: 83.33333333%; }
  .col-md-11 { flex: 0 0 auto; width: 91.66666667%; }
  .col-md-12 { flex: 0 0 auto; width: 100%; }
}

@media (min-width: 992px) {
  .col-lg-1 { flex: 0 0 auto; width: 8.33333333%; }
  .col-lg-2 { flex: 0 0 auto; width: 16.66666667%; }
  .col-lg-3 { flex: 0 0 auto; width: 25%; }
  .col-lg-4 { flex: 0 0 auto; width: 33.33333333%; }
  .col-lg-5 { flex: 0 0 auto; width: 41.66666667%; }
  .col-lg-6 { flex: 0 0 auto; width: 50%; }
  .col-lg-7 { flex: 0 0 auto; width: 58.33333333%; }
  .col-lg-8 { flex: 0 0 auto; width: 66.66666667%; }
  .col-lg-9 { flex: 0 0 auto; width: 75%; }
  .col-lg-10 { flex: 0 0 auto; width: 83.33333333%; }
  .col-lg-11 { flex: 0 0 auto; width: 91.66666667%; }
  .col-lg-12 { flex: 0 0 auto; width: 100%; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }
h5 { font-size: clamp(1rem, 2vw, 1.25rem); }
h6 { font-size: clamp(0.875rem, 1.5vw, 1rem); }

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

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* Header Styles - Bootstrap Integration */
.header {
  background: #ffffff !important;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1030; /* Bootstrap z-index */
  padding: 0;
}

/* Bootstrap Navbar Overrides */
.navbar {
  padding: var(--spacing-md) 0;
  min-height: 70px;
  background: #ffffff !important;
}

.navbar-brand {
  font-size: 1.5rem !important;
  font-weight: 700 !important;
  color: var(--primary-color) !important;
  text-decoration: none !important;
  margin-right: auto;
}

.navbar-brand:hover {
  color: var(--secondary-color) !important;
  text-decoration: none !important;
}

/* Bootstrap Navbar Toggler (Hamburger) */
.navbar-toggler {
  border: 2px solid var(--primary-color) !important;
  border-radius: 0.375rem !important;
  padding: 0.375rem 0.5rem !important;
  font-size: 1.125rem !important;
  background: transparent !important;
  box-shadow: none !important;
  min-width: 44px;
  min-height: 44px;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25) !important;
  outline: none !important;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%232563eb' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
  width: 1.5em;
  height: 1.5em;
}

/* Navigation Links */
.navbar-nav {
  --bs-nav-link-padding-x: 1rem;
  --bs-nav-link-padding-y: 0.5rem;
  --bs-nav-link-color: var(--text-primary);
  --bs-nav-link-hover-color: var(--primary-color);
}

.nav-link {
  color: var(--text-primary) !important;
  font-weight: 500 !important;
  padding: var(--spacing-sm) var(--spacing-md) !important;
  border-radius: 0.375rem !important;
  transition: all 0.3s ease !important;
  margin: 0.125rem 0.25rem !important;
}

.nav-link:hover,
.nav-link:focus {
  background-color: var(--light-color) !important;
  color: var(--primary-color) !important;
  text-decoration: none !important;
}

.nav-link.active {
  background-color: var(--primary-color) !important;
  color: white !important;
}

/* Mobile Navigation Collapse */
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: #ffffff;
    border-radius: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
  }
  
  .navbar-nav {
    width: 100%;
  }
  
  .nav-item {
    width: 100%;
    margin-bottom: 0.25rem;
  }
  
  .nav-link {
    border-radius: 0.375rem !important;
    padding: var(--spacing-md) !important;
    margin: 0.125rem 0 !important;
    display: block !important;
    width: 100% !important;
    min-height: 48px !important;
    display: flex !important;
    align-items: center !important;
  }
}

/* Desktop Navigation */
@media (min-width: 992px) {
  .navbar-nav {
    margin-left: auto;
  }
  
  .nav-item {
    margin-left: 0.25rem;
  }
}


/* Mobile-First Responsive Enhancements */
@media (max-width: 575.98px) {
  .container {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero h1 {
    font-size: 1.75rem;
    line-height: 1.3;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
  }
  
  .card-body {
    padding: var(--spacing-md);
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .section-subtitle {
    font-size: 1rem;
  }
}

@media (max-width: 767.98px) {
  .hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
  }
  
  .hero-actions .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .footer-bottom .row {
    text-align: center;
  }
  
  .footer-bottom .col-md-6:last-child {
    margin-top: var(--spacing-md);
  }
  
  .footer-links[style*="inline-flex"] {
    flex-direction: column !important;
    gap: var(--spacing-sm) !important;
  }
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: var(--spacing-xxl) 0;
  text-align: center;
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.9);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  min-height: 44px;
  min-width: 120px;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #1d4ed8;
  color: white;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background-color: white;
  color: var(--primary-color);
  text-decoration: none;
}

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

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
}

/* Cards */
.card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: all 0.3s ease;
  height: 100%;
}

.card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--light-color);
}

.card-body {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  background-color: var(--light-color);
  margin-top: auto;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  flex: 1;
}

/* Sections */
.section {
  padding: var(--spacing-xxl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xxl);
}

/* Financial Disclaimer */
.financial-disclaimer {
  background-color: #fef3c7;
  border: 1px solid #f59e0b;
  border-radius: 0.5rem;
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.financial-disclaimer h4 {
  color: #92400e;
  margin-bottom: var(--spacing-md);
}

.financial-disclaimer p {
  color: #92400e;
  margin-bottom: 0;
  font-size: 0.875rem;
}

/* Footer */
.footer {
  background-color: var(--dark-color);
  color: white;
  padding: var(--spacing-xxl) 0 var(--spacing-xl) 0;
}

.footer h5 {
  color: white;
  margin-bottom: var(--spacing-lg);
}

.footer p, .footer a {
  color: #d1d5db;
  font-size: 0.875rem;
}

.footer a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  text-align: center;
}

.footer-links {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--dark-color);
  color: white;
  padding: var(--spacing-lg);
  z-index: 1000;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-banner.minimized .cookie-content {
  display: none;
}

.cookie-banner.minimized .cookie-toggle {
  display: block;
}

.cookie-content p {
  margin-bottom: var(--spacing-md);
  color: #d1d5db;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

.cookie-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--secondary-color);
  cursor: pointer;
  font-size: 0.875rem;
  text-decoration: underline;
}

.cookie-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  background-color: transparent;
  color: white;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.3s ease;
  min-height: 40px;
}

.cookie-btn.accept {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
}

.cookie-btn.decline {
  background-color: var(--danger-color);
  border-color: var(--danger-color);
}

.cookie-btn:hover {
  opacity: 0.8;
}

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

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  min-height: 44px;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

/* Responsive Utilities */
@media (min-width: 768px) {
  .d-md-none { display: none; }
  .d-md-block { display: block; }
  .d-md-flex { display: flex; }
  .text-md-left { text-align: left; }
  .text-md-center { text-align: center; }
  .text-md-right { text-align: right; }
}

@media (min-width: 992px) {
  .d-lg-none { display: none; }
  .d-lg-block { display: block; }
  .d-lg-flex { display: flex; }
}

/* Accessibility Improvements */
.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;
}

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

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* Loading Spinner */
.spinner {
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

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

/* Print Styles */
@media print {
  .navbar, .cookie-banner, .mobile-menu, .mobile-menu-overlay {
    display: none !important;
  }
  
  .container {
    max-width: none !important;
  }
  
  a {
    text-decoration: underline;
  }
  
  .hero {
    background: none !important;
    color: black !important;
  }
}