/* CSS Variables & Design Tokens */
:root {
  /* Colors */
  --color-primary: #059669;
  --color-primary-dark: #047857;
  --color-primary-light: #10b981;
  --color-secondary: #374151;
  --color-accent: #3b82f6;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Text Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  --color-text-inverse: var(--color-white);
  
  /* Background Colors */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
  
  /* Font Sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 1.875rem);
  --font-size-3xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.25rem);
  --font-size-4xl: clamp(2.25rem, 1.9rem + 1.75vw, 3rem);
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Spacing - Fluid Spacing */
  --space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.375rem);
  --space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
  --space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
  --space-lg: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem);
  --space-xl: clamp(2rem, 1.6rem + 2vw, 3rem);
  --space-2xl: clamp(3rem, 2.4rem + 3vw, 4.5rem);
  --space-3xl: clamp(4rem, 3.2rem + 4vw, 6rem);
  
  /* Layout */
  --max-width-xs: 20rem;
  --max-width-sm: 24rem;
  --max-width-md: 28rem;
  --max-width-lg: 32rem;
  --max-width-xl: 36rem;
  --max-width-2xl: 42rem;
  --max-width-3xl: 48rem;
  --max-width-4xl: 56rem;
  --max-width-5xl: 64rem;
  --max-width-6xl: 72rem;
  --max-width-7xl: 80rem;
  --max-width-full: 100%;
  --max-width-content: 65ch;
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --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-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* CSS Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

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

/* Remove default styling */
ul, ol {
  list-style: none;
}

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

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

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

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

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

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

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

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

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width-7xl);
  margin: 0 auto;
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

/* Component Styles */

/* Header */
.header {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header__nav {
  padding-block: var(--space-md);
}

.header__nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

/* Brand */
.nav__brand {
  flex-shrink: 0;
}

.brand__link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
}

.brand__link:hover {
  opacity: 0.8;
}

.brand__logo {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.brand__text {
  white-space: nowrap;
}

/* Navigation Menu */
.nav__menu {
  display: none;
  flex: 1;
  justify-content: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav__link--active {
  color: var(--color-primary);
  background: var(--color-gray-50);
}

/* Mobile Navigation Toggle */
.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--color-gray-50);
  transition: background var(--transition-fast);
}

.nav__toggle:hover {
  background: var(--color-gray-100);
}

.nav__toggle-line {
  width: 20px;
  height: 2px;
  background: var(--color-gray-600);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

@media (min-width: 768px) {
  .nav__menu {
    display: flex;
  }
  
  .nav__toggle {
    display: none;
  }
}

/* Hero Section */
.hero {
  padding-block: var(--space-3xl);
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
  overflow: hidden;
  position: relative;
}

.hero .container {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}

.hero__content {
  text-align: center;
}

.hero__title {
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
  max-width: 15ch;
  margin-inline: auto;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 50ch;
  margin-inline: auto;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

.hero__chart {
  display: flex;
  align-items: end;
  gap: var(--space-sm);
  height: 120px;
}

.chart__bar {
  width: 20px;
  background: linear-gradient(to top, var(--color-primary-dark), var(--color-primary));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  animation: growUp 1s ease-out;
  animation-delay: calc(var(--delay, 0) * 0.1s);
  animation-fill-mode: both;
}

.chart__bar:nth-child(1) { --delay: 1; }
.chart__bar:nth-child(2) { --delay: 2; }
.chart__bar:nth-child(3) { --delay: 3; }
.chart__bar:nth-child(4) { --delay: 4; }
.chart__bar:nth-child(5) { --delay: 5; }

@keyframes growUp {
  from {
    height: 0;
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (min-width: 768px) {
  .hero__actions {
    flex-direction: row;
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr 1fr;
    text-align: left;
  }
  
  .hero__content {
    text-align: left;
  }
  
  .hero__title {
    margin-inline: 0;
  }
  
  .hero__subtitle {
    margin-inline: 0;
  }
  
  .hero__actions {
    justify-content: flex-start;
  }
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  min-height: 44px; /* Touch target size */
  text-align: center;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--large {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-lg);
  min-height: 52px;
}

.btn--small {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  min-height: 36px;
}

/* Additional button variants */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-large {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-lg);
  min-height: 52px;
}

/* Section Styles */
.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 60ch;
  margin-inline: auto;
}

/* Calculators Section */
.calculators {
  padding-block: var(--space-3xl);
  background: var(--color-bg-secondary);
}

.calculator-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .calculator-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .calculator-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Calculator Card */
.calculator-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.calculator-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

.card__title {
  margin-bottom: var(--space-md);
  font-size: var(--font-size-xl);
}

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

.card__link:hover {
  color: var(--color-primary);
}

.card__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: auto;
}

.card__tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.card__usage {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Features Section */
.features {
  padding-block: var(--space-3xl);
  background: var(--color-bg-primary);
}

.features__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature {
  text-align: center;
}

.feature__icon {
  width: 64px;
  height: 64px;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin: 0 auto var(--space-lg);
}

.feature__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.feature__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Footer */
.footer {
  background: var(--color-gray-900);
  color: var(--color-text-inverse);
  padding-block: var(--space-2xl);
  margin-top: auto;
}

.footer-content {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.footer-section h3 {
  color: var(--color-text-inverse);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
}

.footer-section h4 {
  color: var(--color-text-inverse);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-md);
}

.footer-section p {
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

.footer-section ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-section ul li {
  list-style: none;
}

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

.footer-section ul li a:hover {
  color: var(--color-text-inverse);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--space-lg);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

.footer-bottom .disclaimer {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  font-style: italic;
}

/* Utility Classes */
.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;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #000000;
    --color-text-primary: #000000;
    --color-text-secondary: #000000;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ================================================
   ETF CALCULATORS PAGE STYLES
   ================================================ */

/* Hero Section - ETF Specific */
.hero--etf-calculators {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  padding-block: var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.hero--etf-calculators::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.05"><circle cx="36" cy="36" r="1"/><circle cx="12" cy="12" r="1"/><circle cx="48" cy="24" r="1"/><circle cx="24" cy="48" r="1"/></g></svg>') repeat;
  opacity: 0.3;
}

.hero--etf-calculators .hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: var(--max-width-4xl);
  margin: 0 auto;
}

.hero--etf-calculators .hero__title {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero--etf-calculators .hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-xl);
  line-height: var(--line-height-relaxed);
  max-width: var(--max-width-3xl);
  margin-inline: auto;
}

/* Hero Stats */
.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  max-width: var(--max-width-2xl);
  margin-inline: auto;
}

.stat {
  text-align: center;
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat__value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Breadcrumb Navigation */
.breadcrumb {
  padding-block: var(--space-md);
  margin-bottom: var(--space-lg);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: var(--space-xs);
  color: var(--color-gray-400);
}

.breadcrumb a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

/* ETF Categories Section */
.etf-categories {
  padding-block: var(--space-3xl);
  background: var(--color-bg-secondary);
}

.etf-category {
  margin-bottom: var(--space-3xl);
}

.etf-category:last-child {
  margin-bottom: 0;
}

.category__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: var(--max-width-4xl);
  margin-inline: auto;
}

.category__title {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  position: relative;
}

.category__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-full);
}

.category__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* ETF Cards Grid */
.category__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

@media (min-width: 768px) {
  .category__grid {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-xl);
  }
}

/* ETF Card Component */
.etf-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.etf-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.etf-card:hover::before {
  opacity: 1;
}

/* Card Header */
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.card__symbol {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.card__link {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

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

.card__yield {
  background: linear-gradient(135deg, var(--color-success), #059669);
  color: var(--color-text-inverse);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
}

/* Card Content */
.card__name {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--line-height-snug);
}

.card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-relaxed);
}

/* Card Details */
.card__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  padding: var(--space-sm);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.detail__item {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.detail__item::before {
  content: '•';
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

/* Tags System */
.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: calc(var(--space-xs) * 0.75) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

/* Tag Variants */
.tag--quality {
  background: rgba(59, 130, 246, 0.1);
  color: #1d4ed8;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.tag--low-cost,
.tag--ultra-low-cost {
  background: rgba(16, 185, 129, 0.1);
  color: #047857;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.tag--high-yield {
  background: rgba(245, 158, 11, 0.1);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.tag--monthly {
  background: rgba(139, 92, 246, 0.1);
  color: #7c3aed;
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.tag--covered-call {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.tag--dividend-growth {
  background: rgba(34, 197, 94, 0.1);
  color: #15803d;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.tag--broad,
.tag--total-market {
  background: rgba(100, 116, 139, 0.1);
  color: #475569;
  border: 1px solid rgba(100, 116, 139, 0.2);
}

.tag--vanguard {
  background: rgba(220, 38, 127, 0.1);
  color: #be185d;
  border: 1px solid rgba(220, 38, 127, 0.2);
}

.tag--ishares {
  background: rgba(59, 130, 246, 0.1);
  color: #2563eb;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.tag--fidelity {
  background: rgba(249, 115, 22, 0.1);
  color: #ea580c;
  border: 1px solid rgba(249, 115, 22, 0.2);
}

.tag--wisdomtree {
  background: rgba(99, 102, 241, 0.1);
  color: #6366f1;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.tag--active {
  background: rgba(168, 85, 247, 0.1);
  color: #9333ea;
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.tag--nasdaq {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.tag--s-p {
  background: rgba(251, 146, 60, 0.1);
  color: #ea580c;
  border: 1px solid rgba(251, 146, 60, 0.2);
}

.tag--options {
  background: rgba(244, 63, 94, 0.1);
  color: #e11d48;
  border: 1px solid rgba(244, 63, 94, 0.2);
}

.tag--small-cap {
  background: rgba(156, 163, 175, 0.1);
  color: #6b7280;
  border: 1px solid rgba(156, 163, 175, 0.2);
}

.tag--aristocrats {
  background: rgba(251, 191, 36, 0.1);
  color: #d97706;
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.tag--value {
  background: rgba(20, 184, 166, 0.1);
  color: #0d9488;
  border: 1px solid rgba(20, 184, 166, 0.2);
}

.tag--buyback {
  background: rgba(168, 85, 247, 0.1);
  color: #a855f7;
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.tag--international {
  background: rgba(14, 165, 233, 0.1);
  color: #0284c7;
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.tag--liquid {
  background: rgba(6, 182, 212, 0.1);
  color: #0891b2;
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.tag--preferred {
  background: rgba(217, 70, 239, 0.1);
  color: #c026d3;
  border: 1px solid rgba(217, 70, 239, 0.2);
}

.tag--sector {
  background: rgba(75, 85, 99, 0.1);
  color: #374151;
  border: 1px solid rgba(75, 85, 99, 0.2);
}

.tag--interest-rate {
  background: rgba(244, 63, 94, 0.1);
  color: #f43f5e;
  border: 1px solid rgba(244, 63, 94, 0.2);
}

.tag--low-vol {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

/* Features Section */
.features-section {
  padding-block: var(--space-3xl);
  background: var(--color-bg-primary);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: var(--max-width-4xl);
  margin-inline: auto;
}

.section__title {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  max-width: var(--max-width-6xl);
  margin-inline: auto;
}

.feature {
  text-align: center;
  padding: var(--space-xl);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.feature:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.feature__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-xl);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

.feature__title {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.feature__description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* CTA Section */
.cta-section {
  padding-block: var(--space-3xl);
  background: linear-gradient(135deg, var(--color-gray-900) 0%, var(--color-gray-800) 100%);
  color: var(--color-text-inverse);
  text-align: center;
}

.cta-content {
  max-width: var(--max-width-4xl);
  margin: 0 auto;
}

.cta-content h2 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
}

.cta-content p {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
}

.cta__buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .cta__buttons {
    flex-direction: row;
    justify-content: center;
  }
}

/* Button Enhancements for ETF Page */
.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

.btn--secondary {
  background: transparent;
  color: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--color-text-inverse);
}

/* Responsive Enhancements */
@media (max-width: 640px) {
  .hero__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
  
  .category__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .etf-card {
    padding: var(--space-md);
  }
  
  .features__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .feature {
    padding: var(--space-lg);
  }
}

/* Loading States and Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.etf-card {
  animation: fadeInUp 0.6s ease-out;
}

.etf-card:nth-child(1) { animation-delay: 0.1s; }
.etf-card:nth-child(2) { animation-delay: 0.2s; }
.etf-card:nth-child(3) { animation-delay: 0.3s; }
.etf-card:nth-child(4) { animation-delay: 0.4s; }
.etf-card:nth-child(5) { animation-delay: 0.5s; }
.etf-card:nth-child(6) { animation-delay: 0.6s; }

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
  .etf-card,
  .feature,
  .btn {
    animation: none;
    transition: none;
  }
  
  .etf-card:hover,
  .feature:hover {
    transform: none;
  }
}

/* Print Styles */
@media print {
  .hero--etf-calculators,
  .cta-section {
    background: white !important;
    color: black !important;
  }
  
  .etf-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}