/* Base Styles: Reset, Typography, and Variables */

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

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
  display: block;
}

body {
  line-height: 1;
}

ol, ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* CSS Variables */
:root {
  --primary-color: #333;
  --secondary-color: #555;
  --accent-color: #777;
  --text-color: #222;
  --background-color: #fff;
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  --spacing-unit: 1rem;
  /* Additional spacing variables for utilities */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  /* Font size variables for headings */
  --font-size-h1: 2rem;
  --font-size-h2: 1.75rem;
  --font-size-h3: 1.5rem;
  --font-size-h4: 1.25rem;
  /* Larger screen sizes for headings */
  --font-size-h1-lg: 2.5rem;
  --font-size-h2-lg: 2rem;
  --font-size-h3-lg: 1.75rem;
  /* Section spacing */
  --section-padding: var(--spacing-xl);
}

/* Typography */
body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-color);
  background-color: var(--background-color);
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-sm);
  font-weight: bold;
}

h1 {
  font-size: var(--font-size-h1);
}

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

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

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

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  text-decoration: underline;
}

/* Mobile-first responsive typography */
@media (min-width: 768px) {
  h1 {
    font-size: var(--font-size-h1-lg);
  }

  h2 {
    font-size: var(--font-size-h2-lg);
  }

  h3 {
    font-size: var(--font-size-h3-lg);
  }
}