/**
 * RunMe Base Styles - Reset & Typography
 * =======================================
 * Foundational styles that normalize browser defaults and establish typography.
 */

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

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

/* Prevent font size inflation */
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  scroll-behavior: smooth;
}

/* Set core body defaults */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
}

/* A elements that don't have a class get default styles */
a:not([class]) {
  text-decoration-skip-ink: auto;
  color: var(--color-primary);
}

/* Make images easier to work with */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* Remove all animations, transitions and smooth scroll for people that prefer not to see them */
@media (prefers-reduced-motion: reduce) {
  html:focus-within {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== TYPOGRAPHY ===== */

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: var(--tracking-tight);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tighter);
}

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

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

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

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

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

/* Paragraphs */
p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

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

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* Strong & Bold */
strong,
b {
  font-weight: var(--font-semibold);
}

/* Emphasis & Italic */
em,
i {
  font-style: italic;
}

/* Small text */
small {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Mark/Highlight */
mark {
  background-color: var(--color-warning-bg);
  color: var(--color-warning-dark);
  padding: var(--space-0-5) var(--space-1);
  border-radius: var(--radius-xs);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-gray-100);
  color: var(--color-danger);
  padding: var(--space-0-5) var(--space-1-5);
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-gray-900);
  color: var(--color-gray-100);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* Blockquote */
blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Horizontal Rule */
hr {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin: var(--space-6) 0;
}

/* Selection */
::selection {
  background-color: var(--color-primary);
  color: white;
}

/* ===== FOCUS STYLES ===== */
:focus {
  outline: none;
}

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

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-gray-300) transparent;
}

/* ===== PLACEHOLDER STYLES ===== */
::placeholder {
  color: var(--color-text-tertiary);
  opacity: 1;
}

/* ===== LAYOUT HELPERS ===== */
.container {
  width: 100%;
  max-width: var(--container-7xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* ===== VISUALLY HIDDEN (Accessibility) ===== */
.visually-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: 0;
}

/* ===== SKIP LINK (Accessibility) ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 100;
  transition: top var(--duration-fast) var(--ease-out);
}

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