/* ==========================================================================
   Epheia UI v2 - CSS Framework
   玻璃拟态个性化框架 v2.0
   ========================================================================== */

/* 构建时间: 2026-03-24T18:24:17.907Z */

/* ==========================================================================
   1. CSS Variables (Design Tokens)
   ========================================================================== */

:root {
  /* ===== Color System - Chocolate Theme (Dark) ===== */
  --color-primary: #ff69b4;
  --color-primary-dark: #ff1493;
  --color-primary-rgb: 255, 105, 180;
  --color-text: rgba(255, 255, 255, 0.9);
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-bg: #121212;
  --color-bg-glass: rgba(255, 255, 255, 0.12);
  --color-bg-glass-hover: rgba(255, 255, 255, 0.22);
  --color-bg-glass-active: rgba(255, 255, 255, 0.30);
  --color-border: rgba(255, 255, 255, 0.15);
  --color-border-hover: rgba(255, 255, 255, 0.25);
  --color-shadow: rgba(0, 0, 0, 0.25);
  --color-code: #ffb6c1;
  --color-bg-code: rgba(0, 0, 0, 0.35);
  --color-overlay: rgba(0, 0, 0, 0.45);
  --color-success: #4ade80;
  --color-warning: #fbbf24;
  --color-error: #f87171;

  /* ===== Spacing System ===== */
  --space-unit: 1rem;
  --space-xs: calc(var(--space-unit) * 0.25);
  --space-sm: calc(var(--space-unit) * 0.5);
  --space-md: var(--space-unit);
  --space-lg: calc(var(--space-unit) * 1.5);
  --space-xl: calc(var(--space-unit) * 2);
  --space-2xl: calc(var(--space-unit) * 3);
  --space-3xl: calc(var(--space-unit) * 4);

  /* ===== Shadow System ===== */
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
  --shadow-xl: 0 12px 48px var(--color-shadow);

  /* ===== Border Radius System ===== */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* ===== Transition System ===== */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease-out;

  /* ===== Typography System ===== */
  --font-sans: 'Segoe UI', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* ===== Layout System ===== */
  --container-max-width: 1200px;
  --content-max-width: 800px;
  --card-max-width: 700px;
  --nav-height: 64px;
  --footer-height: 48px;

  /* ===== Z-Index Scale ===== */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;
}

/* ===== Milkshake Theme (Light Mode) ===== */
:root[data-theme="milkshake"] {
  --color-text: #2d2d2d;
  --color-text-secondary: #666666;
  --color-bg: #fef9f9;
  --color-bg-glass: rgba(255, 240, 245, 0.70);
  --color-bg-glass-hover: rgba(255, 230, 240, 0.85);
  --color-bg-glass-active: rgba(255, 220, 235, 0.95);
  --color-border: rgba(255, 105, 180, 0.25);
  --color-border-hover: rgba(255, 105, 180, 0.40);
  --color-shadow: rgba(255, 105, 180, 0.12);
  --color-code: #c7257a;
  --color-bg-code: rgba(255, 105, 180, 0.08);
  --color-overlay: rgba(255, 240, 245, 0.30);
}

/* ===== System Theme Preference ===== */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg-glass: rgba(0, 0, 0, 0.20);
    --color-bg-glass-hover: rgba(0, 0, 0, 0.30);
    --color-bg-glass-active: rgba(0, 0, 0, 0.40);
    --color-border: rgba(255, 255, 255, 0.12);
    --color-border-hover: rgba(255, 255, 255, 0.22);
    --color-shadow: rgba(0, 0, 0, 0.35);
    --color-overlay: rgba(0, 0, 0, 0.50);
  }
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  padding: var(--space-xl) var(--space-lg);
  padding-bottom: calc(var(--space-lg) + var(--footer-height));
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  background-color: var(--color-bg);
  background-image: 
    radial-gradient(ellipse at 20% 20%, rgba(var(--color-primary-rgb), 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(var(--color-primary-rgb), 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  opacity: 0;
  animation: epheia-fade-in 0.6s ease-out forwards;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  backdrop-filter: blur(0px);
  z-index: -1;
  pointer-events: none;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== 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;
  }
}

@media (prefers-contrast: high) {
  :root {
    --color-border: rgba(255, 255, 255, 0.50);
    --color-text: #ffffff;
  }
}

/* ==========================================================================
   3. Animations
   ========================================================================== */

@keyframes epheia-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes epheia-slide-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes epheia-spin {
  to { transform: rotate(360deg); }
}

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

/* ==========================================================================
   4. Semantic HTML Elements (Glass Morphism Defaults)
   ========================================================================== */

/* ----- Navigation ----- */
nav, .nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
  margin-bottom: var(--space-xl);
  transition: all var(--transition-normal);
}

nav:hover, .nav:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-border-hover);
}

nav h1, nav h2, .nav h1, .nav h2 {
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: 0;
}

nav ul, .nav ul {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

nav a, .nav a {
  color: var(--color-text);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

nav a:hover, nav a:focus,
.nav a:hover, .nav a:focus {
  color: var(--color-primary);
  background: var(--color-bg-glass-hover);
  outline: none;
}

/* ----- Article ----- */
article, .article {
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2xl);
  margin: 0 auto var(--space-xl);
  max-width: var(--content-max-width);
  line-height: 1.8;
  transition: all var(--transition-normal);
}

article:hover, .article:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-xl);
}

article h1, .article h1 {
  font-size: var(--font-size-4xl);
  color: var(--color-primary);
  margin: 0 0 var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid rgba(var(--color-primary-rgb), 0.3);
  line-height: 1.3;
}

article h2, .article h2 {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
  margin: var(--space-2xl) 0 var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.2);
}

article h3, .article h3 { font-size: var(--font-size-xl); color: var(--color-primary); margin: var(--space-xl) 0 var(--space-sm); }
article h4, .article h4 { font-size: var(--font-size-lg); color: var(--color-primary); margin: var(--space-lg) 0 var(--space-sm); }
article h5, .article h5 { font-size: var(--font-size-base); color: var(--color-text); margin: var(--space-md) 0 var(--space-xs); }
article h6, .article h6 { font-size: var(--font-size-sm); color: var(--color-text-secondary); margin: var(--space-md) 0 var(--space-xs); }

article p, .article p { margin-bottom: var(--space-md); }

article a, .article a {
  color: var(--color-primary);
  border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.3);
  transition: all var(--transition-fast);
}

article a:hover, .article a:hover {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

article ul, article ol, .article ul, .article ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

article ul, .article ul { list-style: none; }

article ul li, .article ul li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
}

article ul li::before, .article ul li::before {
  content: '•';
  color: var(--color-primary);
  position: absolute;
  left: 0;
  font-size: 1.2em;
}

article ol li, .article ol li { margin-bottom: var(--space-xs); }

article code, .article code {
  background: var(--color-bg-code);
  color: var(--color-code);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

article pre, .article pre {
  background: var(--color-bg-code);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-border);
}

article pre code, .article pre code {
  background: none;
  padding: 0;
  font-size: var(--font-size-sm);
}

article blockquote, .article blockquote {
  background: var(--color-bg-glass);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

article table, .article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  background: var(--color-bg-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
}

article th, article td, .article th, .article td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

article th, .article th {
  background: var(--color-bg-glass-hover);
  color: var(--color-primary);
  font-weight: 600;
}

article tr:last-child td, .article tr:last-child td {
  border-bottom: none;
}

article hr, .article hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xl) 0;
}

/* ----- Section ----- */
section, .section {
  background: var(--color-bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
  transition: all var(--transition-normal);
}

section:hover, .section:hover {
  background: var(--color-bg-glass-hover);
}

/* ----- Aside ----- */
aside, .aside {
  background: var(--color-bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border-left: 3px solid var(--color-primary);
}

/* ----- Header ----- */
header, .header {
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ----- Footer (Page) ----- */
body > footer, .page-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: var(--color-bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-top: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-normal);
}

body > footer:hover, .page-footer:hover {
  background: var(--color-bg-glass-hover);
}

body > footer .footer-content, .page-footer .footer-content {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

/* ----- Article Footer ----- */
article > footer, .article-footer {
  background: var(--color-bg-glass);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-2xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

/* ----- Details & Summary ----- */
details, .details {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  transition: all var(--transition-fast);
}

details[open], .details[open] {
  background: var(--color-bg-glass-hover);
}

summary, .summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

summary:hover, .summary:hover {
  background: var(--color-bg-glass-hover);
}

/* ----- Figure & Figcaption ----- */
figure, .figure {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-md);
}

figcaption, .figcaption {
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-align: center;
}

/* ==========================================================================
   5. Component Classes
   ========================================================================== */

/* ----- Glass Effect ----- */
.glass {
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.glass:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-border-hover);
}

.glass-sm { backdrop-filter: blur(8px); border-radius: var(--radius-md); }
.glass-lg { backdrop-filter: blur(24px); border-radius: var(--radius-xl); }
.glass-dynamic:hover { backdrop-filter: blur(24px); }

/* ----- Card ----- */
.card {
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  max-width: var(--card-max-width);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--color-bg-glass-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-header { margin-bottom: var(--space-md); padding-bottom: var(--space-sm); border-bottom: 1px solid var(--color-border); }
.card-header h3 { color: var(--color-primary); margin: 0; font-size: var(--font-size-lg); }
.card-body { margin-bottom: var(--space-md); }
.card-footer { margin-top: var(--space-md); padding-top: var(--space-sm); border-top: 1px solid var(--color-border); display: flex; justify-content: space-between; align-items: center; }

.card-featured { position: relative; overflow: hidden; }
.card-featured::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark)); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-lg); margin-bottom: var(--space-lg); }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ----- Button ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  text-decoration: none;
  user-select: none;
}

.btn:hover, .btn:focus {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }

.btn-primary { background: rgba(var(--color-primary-rgb), 0.20); border-color: rgba(var(--color-primary-rgb), 0.40); color: var(--color-primary); }
.btn-primary:hover { background: rgba(var(--color-primary-rgb), 0.30); border-color: var(--color-primary); color: var(--color-primary-dark); }

.btn-secondary { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.15); }
.btn-secondary:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.25); }

.btn-success { background: rgba(74, 222, 128, 0.15); border-color: rgba(74, 222, 128, 0.3); color: var(--color-success); }
.btn-warning { background: rgba(251, 191, 36, 0.15); border-color: rgba(251, 191, 36, 0.3); color: var(--color-warning); }
.btn-error { background: rgba(248, 113, 113, 0.15); border-color: rgba(248, 113, 113, 0.3); color: var(--color-error); }

.btn-sm { padding: var(--space-xs) var(--space-sm); font-size: var(--font-size-xs); }
.btn-lg { padding: var(--space-md) var(--space-xl); font-size: var(--font-size-base); }
.btn-disabled, .btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--color-bg-glass); border-color: var(--color-border); }
.btn-outline { background: transparent; border-width: 2px; }

.btn-group { display: inline-flex; }
.btn-group .btn { border-radius: 0; margin-right: -1px; }
.btn-group .btn:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.btn-group .btn:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; margin-right: 0; }
.btn-group .btn:hover { z-index: 1; position: relative; }

/* ----- Theme Switcher ----- */
.theme-switcher, [data-theme-switcher] {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.theme-switcher:hover, [data-theme-switcher]:hover {
  background: var(--color-bg-glass-hover);
  transform: translateY(-1px);
}

/* ----- Nav Component ----- */
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: var(--container-max-width); margin: 0 auto; gap: var(--space-xl); }
.nav-brand { font-size: var(--font-size-xl); color: var(--color-primary); font-weight: 600; text-decoration: none; transition: color var(--transition-fast); }
.nav-brand:hover { color: var(--color-primary-dark); }
.nav-menu { display: flex; gap: var(--space-md); list-style: none; align-items: center; margin: 0; padding: 0; }
.nav-link { color: var(--color-text); padding: var(--space-xs) var(--space-sm); border-radius: var(--radius-sm); transition: all var(--transition-fast); font-weight: 500; }
.nav-link:hover, .nav-link.active { color: var(--color-primary); background: var(--color-bg-glass-hover); }

/* ----- Footer Component ----- */
.footer-content { display: flex; justify-content: space-between; align-items: center; width: 100%; max-width: var(--container-max-width); margin: 0 auto; gap: var(--space-lg); flex-wrap: wrap; }
.footer-text { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin: 0; }
.footer-links { display: flex; gap: var(--space-md); list-style: none; margin: 0; padding: 0; }
.footer-link { color: var(--color-text-secondary); font-size: var(--font-size-sm); transition: color var(--transition-fast); }
.footer-link:hover { color: var(--color-primary); }

/* ----- CC License ----- */
.cc-license { text-decoration: none; color: var(--color-text-secondary); font-size: var(--font-size-sm); transition: color var(--transition-fast); }
.cc-license:hover { color: var(--color-primary); }

/* ==========================================================================
   6. Utility Classes
   ========================================================================== */

/* Spacing */
.m-0 { margin: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.ml-0 { margin-left: 0 !important; }
.mr-0 { margin-right: 0 !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }

.mt-xs { margin-top: var(--space-xs) !important; }
.mt-sm { margin-top: var(--space-sm) !important; }
.mt-md { margin-top: var(--space-md) !important; }
.mt-lg { margin-top: var(--space-lg) !important; }
.mt-xl { margin-top: var(--space-xl) !important; }
.mt-2xl { margin-top: var(--space-2xl) !important; }

.mb-xs { margin-bottom: var(--space-xs) !important; }
.mb-sm { margin-bottom: var(--space-sm) !important; }
.mb-md { margin-bottom: var(--space-md) !important; }
.mb-lg { margin-bottom: var(--space-lg) !important; }
.mb-xl { margin-bottom: var(--space-xl) !important; }
.mb-2xl { margin-bottom: var(--space-2xl) !important; }

.p-0 { padding: 0 !important; }
.p-xs { padding: var(--space-xs) !important; }
.p-sm { padding: var(--space-sm) !important; }
.p-md { padding: var(--space-md) !important; }
.p-lg { padding: var(--space-lg) !important; }
.p-xl { padding: var(--space-xl) !important; }
.p-2xl { padding: var(--space-2xl) !important; }

.px-xs { padding-left: var(--space-xs) !important; padding-right: var(--space-xs) !important; }
.px-sm { padding-left: var(--space-sm) !important; padding-right: var(--space-sm) !important; }
.px-md { padding-left: var(--space-md) !important; padding-right: var(--space-md) !important; }
.px-lg { padding-left: var(--space-lg) !important; padding-right: var(--space-lg) !important; }
.px-xl { padding-left: var(--space-xl) !important; padding-right: var(--space-xl) !important; }

.py-xs { padding-top: var(--space-xs) !important; padding-bottom: var(--space-xs) !important; }
.py-sm { padding-top: var(--space-sm) !important; padding-bottom: var(--space-sm) !important; }
.py-md { padding-top: var(--space-md) !important; padding-bottom: var(--space-md) !important; }
.py-lg { padding-top: var(--space-lg) !important; padding-bottom: var(--space-lg) !important; }
.py-xl { padding-top: var(--space-xl) !important; padding-bottom: var(--space-xl) !important; }

.gap-xs { gap: var(--space-xs) !important; }
.gap-sm { gap: var(--space-sm) !important; }
.gap-md { gap: var(--space-md) !important; }
.gap-lg { gap: var(--space-lg) !important; }
.gap-xl { gap: var(--space-xl) !important; }

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

.font-light { font-weight: 300 !important; }
.font-normal { font-weight: 400 !important; }
.font-medium { font-weight: 500 !important; }
.font-semibold { font-weight: 600 !important; }
.font-bold { font-weight: 700 !important; }

.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-base { font-size: var(--font-size-base) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }
.text-2xl { font-size: var(--font-size-2xl) !important; }
.text-3xl { font-size: var(--font-size-3xl) !important; }
.text-4xl { font-size: var(--font-size-4xl) !important; }

.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-muted { color: var(--color-text-secondary) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-error { color: var(--color-error) !important; }

.underline { text-decoration: underline !important; }
.no-underline { text-decoration: none !important; }
.line-through { text-decoration: line-through !important; }

.uppercase { text-transform: uppercase !important; }
.lowercase { text-transform: lowercase !important; }
.capitalize { text-transform: capitalize !important; }

.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.break-words { word-wrap: break-word; word-break: break-word; }

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

.flex-row { flex-direction: row !important; }
.flex-col { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }

.items-start { align-items: flex-start !important; }
.items-center { align-items: center !important; }
.items-end { align-items: flex-end !important; }
.items-stretch { align-items: stretch !important; }

.justify-start { justify-content: flex-start !important; }
.justify-center { justify-content: center !important; }
.justify-end { justify-content: flex-end !important; }
.justify-between { justify-content: space-between !important; }
.justify-around { justify-content: space-around !important; }

.grid-cols-1 { grid-template-columns: repeat(1, 1fr) !important; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr) !important; }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr) !important; }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr) !important; }
.grid-cols-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)) !important; }

.relative { position: relative !important; }
.absolute { position: absolute !important; }
.fixed { position: fixed !important; }
.sticky { position: sticky !important; }

.z-10 { z-index: 10 !important; }
.z-50 { z-index: 50 !important; }
.z-100 { z-index: 100 !important; }
.z-200 { z-index: 200 !important; }

.w-full { width: 100% !important; }
.h-full { height: 100% !important; }

/* Layout */
.container { max-width: var(--container-max-width); margin: 0 auto; padding: 0 var(--space-lg); }
.content { max-width: var(--content-max-width); margin: 0 auto; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-glass); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* Selection */
::selection { background: rgba(var(--color-primary-rgb), 0.3); color: var(--color-text); }

/* ==========================================================================
   7. Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
  body { padding: var(--space-lg) var(--space-md); padding-bottom: calc(var(--space-md) + var(--footer-height)); }
  
  nav, .nav { padding: var(--space-sm) var(--space-md); flex-direction: column; gap: var(--space-sm); }
  nav ul, .nav ul { gap: var(--space-sm); }
  
  article, .article { padding: var(--space-lg); }
  article h1, .article h1 { font-size: var(--font-size-3xl); }
  article h2, .article h2 { font-size: var(--font-size-2xl); }
  article h3, .article h3 { font-size: var(--font-size-xl); }
  
  .card-grid { grid-template-columns: 1fr; }
  .card-grid-2, .card-grid-3, .card-grid-4 { grid-template-columns: 1fr; }
  
  .footer-content { flex-direction: column; text-align: center; gap: var(--space-sm); }
  
  .hidden-md { display: none !important; }
}

@media (max-width: 480px) {
  body { padding: var(--space-md) var(--space-sm); padding-bottom: calc(var(--space-sm) + var(--footer-height)); }
  
  article, .article { padding: var(--space-md); border-radius: var(--radius-lg); }
  article h1, .article h1 { font-size: var(--font-size-2xl); }
  
  .btn-lg { padding: var(--space-sm) var(--space-md); }
  
  .hidden-sm { display: none !important; }
}