/**
 * Base Styles
 * Global styles using design system variables
 *
 * Note: reset.css and variables.css are loaded via separate <link> tags
 * in _renderer.tsx for parallel fetching (avoids @import waterfall).
 */

/* Root element styles */
html {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Body styles */
body {
  font-weight: var(--font-weight-normal);
}

/* Headings - Archivo Black, uppercase */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

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);
}

/* Paragraph */
p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

/* Message bubbles - ensure text color inheritance for nested elements */
.message__bubble p,
.message__bubble span,
.message__bubble a {
  color: inherit;
}

/* Lists - for markdown content */
ul,
ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
  color: var(--color-text);
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

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

/* Nested lists */
ul ul,
ol ul {
  list-style-type: circle;
  margin-top: var(--spacing-xs);
  margin-bottom: 0;
}

ul ul ul,
ol ul ul {
  list-style-type: square;
}

ol ol,
ul ol {
  list-style-type: lower-alpha;
  margin-top: var(--spacing-xs);
  margin-bottom: 0;
}

/* Blockquotes - for markdown content */
blockquote {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  border-left: 4px solid var(--color-border);
  background-color: var(--color-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

blockquote p {
  margin-bottom: 0;
}

blockquote p:not(:last-child) {
  margin-bottom: var(--spacing-sm);
}

/* Nested blockquotes */
blockquote blockquote {
  margin-top: var(--spacing-sm);
  border-left-color: var(--color-border-light);
}

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

th {
  background-color: var(--color-main);
  color: var(--color-text-inverse);
  font-family: var(--font-family);
  font-weight: var(--font-weight-bold);
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
}

td {
  background-color: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border-light);
}

tr:nth-child(even) td {
  background-color: var(--color-surface-hover);
}

tr:hover td {
  background-color: var(--color-selection);
}

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

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

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

/* Code */
code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  background-color: var(--color-surface);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  background-color: var(--color-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

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

/* Form elements */
input,
textarea,
select {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 2px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* Radio and checkbox - reset to allow custom styling */
input[type="radio"],
input[type="checkbox"] {
  padding: 0;
  border-radius: 0;
}

/* Course cards - equal height */
.course-card {
  height: 100%;
  border-color: var(--color-border-light) !important;
  padding: 24px !important;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-border) !important;
  background-color: var(--color-surface-hover) !important;
}

.course-description {
  flex: 1;
}

/* Lessons card on course detail page */
.lessons-card {
  border-color: var(--color-border-light) !important;
  border-width: 1px !important;
  padding: 24px !important;
}

/* Lesson link hover effect */
.lesson-link,
.quiz-link {
  cursor: pointer;
}

.lesson-link:hover,
.quiz-link:hover {
  border-color: var(--color-border) !important;
  background-color: var(--color-surface-hover) !important;
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* Flashcard practice link */
.flashcard-link {
  cursor: pointer;
}

.flashcard-link:hover {
  border-color: var(--color-border) !important;
  background-color: var(--color-surface-hover) !important;
}

/* Lesson info card on lesson detail page */
.lesson-info-card {
  border-color: var(--color-border-light) !important;
}

/* Quiz cards */
.quiz-card {
  border-color: var(--color-border-light) !important;
  border-width: 1px !important;
}

/* Survey cards */
.survey-card {
  border-color: var(--color-border-light) !important;
  border-width: 1px !important;
}

/* Login card */
.login-card {
  border-color: var(--color-border-light) !important;
  border-width: 1px !important;
  border-width: 1px !important;
}

/* Survey step indicator */
.step-indicator {
  font-size: var(--font-size-sm) !important;
  color: var(--color-main) !important;
}

/* Survey question title - responsive */
.survey-question-title {
  font-size: var(--font-size-xl) !important;
}

@media (max-width: 768px) {
  .survey-question-title {
    font-size: var(--font-size-lg) !important;
  }
}

@media (max-width: 480px) {
  .survey-question-title {
    font-size: var(--font-size-base) !important;
  }
}

/* Quiz slider track */
.slider input[type="range"]::-webkit-slider-runnable-track {
  height: 0.5rem;
  border-radius: 9999px;
}

.slider input[type="range"]::-moz-range-track {
  height: 0.5rem;
  border-radius: 9999px;
}

/* Quiz slider thumb - circle */
.slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background-color: white;
  border: 2px solid var(--color-main);
  cursor: grab;
  margin-top: -0.375rem;
}

.slider input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.slider input[type="range"]::-moz-range-thumb {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background-color: white;
  border: 2px solid var(--color-main);
  cursor: grab;
}

.slider input[type="range"]::-moz-range-thumb:active {
  cursor: grabbing;
}

.lesson-title {
  margin-bottom: 0 !important;
}

.badge-duration {
  background-color: var(--color-border) !important;
  color: white !important;
  border: none !important;
}

/* Section heading - lighter style with Inter */
.heading--section {
  font-family: var(--font-family) !important;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-weight-bold) !important;
}

/* Extra top spacing on desktop for content pages */
@media (min-width: 768px) {
  .page-content {
    padding-top: 120px;
  }
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-selection);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
}

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

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

/* Toggle switch focus indicator */
.toggle-switch:focus {
  box-shadow: 0 0 0 3px var(--color-selection);
}

.toggle-switch:focus:not(:focus-visible) {
  box-shadow: none;
}

.toggle-switch[aria-disabled="true"]:focus {
  box-shadow: none;
}

/* Utility: visually hidden but accessible */
.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;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

/* Main content area */
main {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-lg) 0;
}

/* Button hover/active states */
.button--primary:not(:disabled):hover {
  background-color: var(--color-main-hover);
}

.button--primary:not(:disabled):active {
  background-color: var(--color-main-active);
}

.button--secondary:not(:disabled):hover {
  background-color: var(--color-surface-hover);
}

.button--ghost:not(:disabled):hover {
  background-color: var(--color-surface-hover);
}

.button--cta:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 90, 79, 0.45);
}

.button--cta:not(:disabled):active {
  transform: translateY(0);
  box-shadow: 0 2px 12px rgba(232, 90, 79, 0.3);
}

/* Survey question transitions */
@keyframes surveyFadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

@keyframes surveyFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.survey-step {
  animation: surveyFadeIn var(--transition-slow) ease forwards;
}

.survey-step--exiting {
  animation: surveyFadeOut var(--transition-slow) ease forwards;
  pointer-events: none;
}

/* Radio button selection animation */
@keyframes radioSelectPop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

.radio-select-animation {
  animation: radioSelectPop 200ms ease-out;
}

/* Card-style radio option selection animation */
@keyframes cardSelectPop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
  100% {
    transform: scale(1);
  }
}

.radio-card-select-animation {
  animation: cardSelectPop 200ms ease-out;
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .survey-step,
  .survey-step--exiting {
    animation: none;
  }

  .radio-select-animation,
  .radio-card-select-animation {
    animation: none;
  }
}

/* Survey option card hover */
.survey-option-card:hover {
  background-color: var(--color-surface-hover) !important;
  border-color: var(--color-border) !important;
}

.survey-option-card:hover .survey-option-radio,
.survey-option-card:hover input[type="checkbox"] {
  border-color: var(--color-border) !important;
}

/* ═══════════════════════════════════════
   MOBILE NAVIGATION
   ═══════════════════════════════════════ */

/* Desktop: show nav, hide hamburger */
@media (min-width: 769px) {
  .header__nav-desktop {
    display: flex !important;
  }

  .mobile-menu-button {
    display: none !important;
  }
}

/* Mobile: hide nav, show hamburger */
@media (max-width: 768px) {
  .header__nav-desktop {
    display: none !important;
  }

  .mobile-menu-button {
    display: flex !important;
  }

  /* Reduce header padding on mobile */
  .header {
    padding-left: var(--spacing-md) !important;
    padding-right: var(--spacing-md) !important;
  }
}

/* Mobile menu button hover state */
.mobile-menu-button:hover {
  background-color: var(--color-surface-hover);
}

/* Mobile menu link hover state */
[data-testid="mobile-menu-nav"] a:hover {
  background-color: var(--color-surface-hover);
}

/* Mobile menu close button hover state */
[data-testid="mobile-menu-close"]:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
}

/* ═══════════════════════════════════════
   SKELETON LOADING
   ═══════════════════════════════════════ */

@keyframes skeleton-shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border-light) 25%,
    var(--color-surface) 50%,
    var(--color-border-light) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* Respect reduced motion preference for skeleton */
@media (prefers-reduced-motion: reduce) {
  .skeleton {
    animation: none;
    background: var(--color-border-light);
  }
}