/*
 * base.css - Reset & Foundation Styles
 * Shared across all modules
 */

/* =========================================================================
 * CSS RESET (Modern Minimal)
 * ========================================================================= */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-app);
  min-height: 100vh;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

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

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

a {
  color: var(--text-link);
  text-decoration: none;
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

p {
  margin-bottom: var(--space-4);
}

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

code, pre, kbd {
  font-family: var(--font-mono);
}

code {
  background: var(--bg-input);
  padding: 0.125em 0.375em;
  border-radius: var(--border-radius-sm);
  font-size: 0.9em;
}

pre {
    background: var(--bg-input);
    color: var(--text-primary);
    padding: var(--space-4);
    border-radius: var(--border-radius-md);
    overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5em;
  padding: 0.125em 0.375em;
  font-size: var(--text-xs);
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--border-radius-sm);
  box-shadow: 0 1px 0 var(--border-default);
  color: var(--text-primary);
}

::selection {
  background: var(--brand-primary-light);
  color: var(--brand-primary-hover);
}

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

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

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

::-webkit-scrollbar-track {
  background: var(--bg-input);
  border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--border-radius-full);
}

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

/* Dark mode scrollbar */
[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--gray-800);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--gray-600);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

/* =========================================================================
 * UTILITY CLASSES
 * ========================================================================= */

/* Display */
.hidden { display: none !important; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

/* Flexbox */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.flex-1 { flex: 1; }
.flex-auto { flex: auto; }
.flex-none { flex: none; }
.flex-grow { flex-grow: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Text alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Text colors */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-info { color: var(--color-info); }

/* Font weights */
.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

/* Font sizes */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }

/* Spacing - margin */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-4 { margin: var(--space-4); }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.ml-1 { margin-left: var(--space-1); }
.ml-2 { margin-left: var(--space-2); }
.ml-4 { margin-left: var(--space-4); }
.mr-1 { margin-right: var(--space-1); }
.mr-2 { margin-right: var(--space-2); }
.mr-4 { margin-right: var(--space-4); }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Spacing - padding */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

/* Width & Height */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* Overflow */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-y-auto { overflow-y: auto; }
.overflow-x-hidden { overflow-x: hidden; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }

/* Border radius */
.rounded { border-radius: var(--border-radius-md); }
.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }
.rounded-full { border-radius: var(--border-radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-none { box-shadow: none; }

/* Cursor */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }
.cursor-grab { cursor: grab; }

/* User select */
.select-none { user-select: none; }
.select-text { user-select: text; }
.select-all { user-select: all; }

/* Pointer events */
.pointer-events-none { pointer-events: none; }
.pointer-events-auto { pointer-events: auto; }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Transitions */
.transition { transition: all var(--duration-normal) var(--ease-out); }
.transition-fast { transition: all var(--duration-fast) var(--ease-out); }
.transition-slow { transition: all var(--duration-slow) var(--ease-out); }
.transition-none { transition: none; }

/* Truncate text */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 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: 0;
}

/* =========================================================================
 * BILINGUAL CONTENT
 * ========================================================================= */
.bilingual-content {
  position: relative;
}

.bilingual-content .primary {
  display: block;
  font-size: 1.1em;
  margin-bottom: var(--space-2);
  font-weight: var(--font-medium);
}

.bilingual-content .support {
  display: none;
  font-size: 0.95em;
  color: var(--text-secondary);
  padding-left: var(--space-4);
  border-left: 2px solid var(--border-light);
  margin-top: var(--space-2);
}

.bilingual-content[data-show-dual="true"] .support {
  display: block;
}

.bilingual-content .content.en {
  border-left-color: var(--lang-en-color);
}

.bilingual-content .content.vn {
  border-left-color: var(--lang-vn-color);
}

.bilingual-content .content {
  padding-left: var(--space-3);
}

.content-group {
  margin-bottom: var(--space-4);
}

/* Language indicators */
.lang-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--border-radius-sm);
}

.lang-indicator--en {
  background: var(--lang-en-light);
  color: var(--lang-en-color);
}

.lang-indicator--vn {
  background: var(--lang-vn-light);
  color: var(--lang-vn-color);
}

/* =========================================================================
 * ANIMATIONS
 * ========================================================================= */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

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

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

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

.animate-fade-in { animation: fadeIn var(--duration-normal) var(--ease-out); }
.animate-slide-up { animation: slideInUp var(--duration-normal) var(--ease-out); }
.animate-slide-down { animation: slideInDown var(--duration-normal) var(--ease-out); }
.animate-scale-in { animation: scaleIn var(--duration-normal) var(--ease-out); }
.animate-spin { animation: spin 1s linear infinite; }
.animate-pulse { animation: pulse 2s var(--ease-in-out) infinite; }
.animate-bounce { animation: bounce 1s var(--ease-in-out) infinite; }