/*!
 * Cool Digital API Tools - 2025 Design System Foundation
 * Primary design foundation implementing 2025 web design trends
 * Features: Modern typography, warm color palette, accessibility-first approach
 */

/* Import design tokens */
@import './tokens.css';

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,100..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400..900;1,400..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&display=swap');

/* ================================
   MODERN CSS FOUNDATION
   ================================ */

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

html {
  font-size: 100%; /* 16px base */
  scroll-behavior: smooth;
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-comfortable);
  color: var(--color-text-primary);
  background-color: var(--color-surface-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  body {
    color: var(--color-text-primary-dark);
    background-color: var(--color-surface-primary-dark);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-primary-6: #000000;
    --color-text-primary: #000000;
    --color-border: #000000;
  }
  
  [data-theme="dark"] {
    --color-primary-6: #ffffff;
    --color-text-primary: #ffffff;
    --color-border: #ffffff;
  }
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin: 0;
  color: var(--color-text-heading);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-2);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

p {
  margin-bottom: var(--space-4);
  max-width: 70ch; /* Optimal reading line length */
}

/* ================================
   LINK STYLES
   ================================ */

a {
  color: var(--color-primary-6);
  text-decoration: underline;
  text-decoration-color: var(--color-primary-3);
  text-underline-offset: 0.125em;
  transition: all var(--transition-fast) var(--transition-ease);
}

a:hover {
  color: var(--color-primary-7);
  text-decoration-color: var(--color-primary-6);
  transform: translateY(-1px);
}

a:focus-visible {
  outline: 2px solid var(--color-primary-6);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

a:active {
  transform: translateY(0);
}

/* ================================
   FORM ELEMENTS
   ================================ */

button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
  margin: 0;
}

button,
input {
  overflow: visible;
}

button,
select {
  text-transform: none;
}

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

button:disabled,
[type="button"]:disabled,
[type="reset"]:disabled,
[type="submit"]:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* Remove default button styles */
button {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

/* ================================
   INPUT STYLES
   ================================ */

input,
textarea,
select {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-comfortable);
  color: var(--color-text-primary);
  background-color: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: all var(--transition-fast) var(--transition-ease);
  width: 100%;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary-6);
  box-shadow: var(--shadow-focus);
  background-color: var(--color-surface-primary);
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--color-primary-4);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-secondary);
  opacity: 1;
}

/* ================================
   LIST STYLES
   ================================ */

ul, ol {
  margin: 0;
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-1);
  line-height: var(--line-height-comfortable);
}

/* ================================
   TABLE STYLES
   ================================ */

table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: var(--space-4);
  background-color: var(--color-surface-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

th, td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-surface-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-heading);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

tr:hover {
  background-color: var(--color-surface-tertiary);
}

/* ================================
   CODE STYLES
   ================================ */

code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  background-color: var(--color-surface-secondary);
  color: var(--color-primary-7);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

pre {
  background-color: var(--color-surface-secondary);
  color: var(--color-text-primary);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-4);
  border-left: 4px solid var(--color-primary-6);
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-weight: normal;
}

/* ================================
   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;
}

.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* Focus styles for accessibility */
.focus-visible:focus-visible {
  outline: 2px solid var(--color-primary-6);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary-6);
  color: var(--color-surface-primary);
  padding: var(--space-2) var(--space-3);
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: var(--z-index-tooltip);
  font-weight: var(--font-weight-semibold);
  transition: top var(--transition-fast) var(--transition-ease);
}

.skip-link:focus {
  top: 6px;
}

/* ================================
   RESPONSIVE IMAGES
   ================================ */

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

/* ================================
   PRINT STYLES
   ================================ */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  abbr[title]::after {
    content: " (" attr(title) ")";
  }

  img {
    page-break-inside: avoid;
  }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }
}

/* ================================
   COMPONENT FOUNDATIONS
   ================================ */

/* Card foundation */
.card-foundation {
  background: var(--color-surface-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-medium) var(--transition-ease);
  overflow: hidden;
}

.card-foundation:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Button foundation */
.btn-foundation {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast) var(--transition-ease);
  min-height: 44px; /* Accessibility - minimum touch target */
  position: relative;
  overflow: hidden;
}

.btn-foundation:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none !important;
}

.btn-foundation:not(:disabled):hover {
  transform: translateY(-2px);
}

.btn-foundation:not(:disabled):active {
  transform: translateY(0);
}

/* Container foundation */
.container-foundation {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container-foundation {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container-foundation {
    padding: 0 var(--space-8);
  }
}

/* Container class used by index.html */
.container {
  max-width: var(--container-max-width, 1200px);
  margin: 0 auto;
  padding: 0 var(--container-padding-mobile, 2rem);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--container-padding-tablet, 3rem);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--container-padding-desktop, 4rem);
  }
}

/* ================================
   ANIMATION FOUNDATIONS
   ================================ */

/* Fade in animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide in animation */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Pulse animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Loading spinner */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Gentle bounce for hover effects */
@keyframes gentleBounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-4px);
  }
  60% {
    transform: translateY(-2px);
  }
}


/* ================================
   FOCUS MANAGEMENT
   ================================ */

/* Enhanced focus styles */
:focus-visible {
  outline: 2px solid var(--color-primary-6);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Remove default focus outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* Focus ring for interactive elements */
.focus-ring:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-surface-primary), 
              0 0 0 4px var(--color-primary-6);
}