/**
 * Base Styles - Reset and Typography
 * Provides foundation for privacy, AI, trust, and security themed sites
 */

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

html {
  line-height: var(--leading-normal);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Smooth theme transitions — applied to the root so dark/light switching feels polished */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
  transition-property: background-color, border-color, color, box-shadow;
  transition-duration: 0.25s;
  transition-timing-function: ease;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: var(--leading-normal);
}

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

h1 {
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-lg);
}

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

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

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

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

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

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--leading-relaxed);
}

/* === Links === */
a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

/* === Lists === */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-sm);
  line-height: var(--leading-relaxed);
}

ul ul, ol ol, ul ol, ol ul {
  margin-bottom: var(--spacing-sm);
}

/* === Code and Pre === */
code, pre, kbd, samp {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

code {
  padding: 0.125rem 0.25rem;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--security-primary);
}

pre {
  padding: var(--spacing-md);
  background-color: var(--neutral-900);
  color: var(--neutral-50);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

pre code {
  padding: 0;
  background-color: transparent;
  color: inherit;
}

kbd {
  padding: 0.125rem 0.375rem;
  background-color: var(--neutral-800);
  color: var(--neutral-50);
  border-radius: var(--radius-sm);
  border: 1px solid var(--neutral-700);
  box-shadow: var(--shadow-sm);
}

/* === Images and Media === */
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

img {
  border-style: none;
}

svg {
  overflow: hidden;
  vertical-align: middle;
}

/* === Tables === */
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  margin-bottom: var(--spacing-md);
}

th, td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-primary);
}

th {
  font-weight: var(--font-semibold);
  background-color: var(--bg-secondary);
}

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

button, input {
  overflow: visible;
}

button, select {
  text-transform: none;
}

button,
[type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer;
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

textarea {
  overflow: auto;
  resize: vertical;
}

[type="search"] {
  -webkit-appearance: textfield;
  outline-offset: -2px;
}

[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}

/* === Accessibility === */
[hidden] {
  display: none !important;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: var(--focus-ring-offset);
}

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

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

/* === Scrollbar Styling (Webkit) === */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

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

::-webkit-scrollbar-thumb {
  background-color: var(--neutral-400);
  border-radius: var(--radius-full);
  border: 3px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--neutral-500);
}

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

@media (min-width: 640px) {
  .container {
    max-width: 640px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 768px;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }
}

@media (min-width: 1536px) {
  .container {
    max-width: 1536px;
  }
}

@media (min-width: 1920px) {
  .container {
    max-width: 1800px;
  }
}