/* ========================================
   CSS Reset & Base Styles
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

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

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

p {
  margin: 0;
  line-height: var(--line-height-relaxed);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  cursor: pointer;
}

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

a:active {
  opacity: var(--opacity-focus);
}

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

/* Lists */
ul, ol {
  list-style: none;
}

/* Forms */
input,
textarea,
select,
button {
  font: inherit;
  color: inherit;
}

input,
textarea,
select {
  background: inherit;
  border: inherit;
  border-radius: inherit;
}

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

input:disabled,
textarea:disabled,
select:disabled,
button:disabled {
  opacity: var(--opacity-disabled);
  cursor: not-allowed;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Tables */
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

td, th {
  padding: 0;
  text-align: left;
  vertical-align: top;
}

/* Code */
code,
pre {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
}

code {
  background: var(--color-bg-tertiary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-accent-light);
}

pre {
  background: var(--color-bg-secondary);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  line-height: var(--line-height-normal);
}

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

/* Horizontal Rule */
hr {
  border: none;
  height: 1px;
  background: var(--color-border-strong);
  margin: var(--space-6) 0;
}

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

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

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

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

/* Placeholder text */
::placeholder {
  color: var(--color-text-muted);
  opacity: 1;
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  a {
    color: blue;
    text-decoration: underline;
  }
}