/* =====================================================
   QMF UI - Modern Homepage Styles
   Mandarin Quizz Framework
   ===================================================== */

/* Hide legacy sidebar when using QMF sidebar */
aside#sidebar.sidebar,
#sidebar.sidebar {
  display: none !important;
}

/* CSS Custom Properties */
:root {
  /* Colors - Light Theme - Soft Teal/Cyan */
  --qmf-bg-primary: #ffffff;
  --qmf-bg-secondary: #f8fafb;
  --qmf-bg-tertiary: #f0f4f8;
  --qmf-bg-glass: rgba(255, 255, 255, 0.75);
  --qmf-bg-glass-strong: rgba(255, 255, 255, 0.92);
  
  --qmf-text-primary: #1a2332;
  --qmf-text-secondary: #4a5568;
  --qmf-text-muted: #718096;
  --qmf-text-inverse: #ffffff;
  
  --qmf-accent-primary: #0891b2;
  --qmf-accent-secondary: #0284c7;
  --qmf-accent-gradient: linear-gradient(135deg, #0891b2 0%, #0284c7 50%, #0ea5e9 100%);
  --qmf-accent-glow: rgba(8, 145, 178, 0.25);
  
  --qmf-success: #10b981;
  --qmf-warning: #f59e0b;
  --qmf-error: #ef4444;
  --qmf-info: #3b82f6;
  
  --qmf-border: rgba(0, 0, 0, 0.08);
  --qmf-border-strong: rgba(0, 0, 0, 0.12);
  
  --qmf-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --qmf-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --qmf-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --qmf-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --qmf-shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --qmf-shadow-glow: 0 0 40px var(--qmf-accent-glow);
  
  /* Layout */
  --qmf-header-height: 72px;
  --qmf-sidebar-width: 280px;
  --qmf-container-max: 1280px;
  --qmf-border-radius: 16px;
  --qmf-border-radius-sm: 8px;
  --qmf-border-radius-lg: 24px;
  --qmf-border-radius-full: 9999px;
  
  /* Transitions */
  --qmf-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --qmf-transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --qmf-transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --qmf-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Dynamic Island */
  --island-width-collapsed: 220px;
  --island-width-expanded: 340px;
  --island-height-collapsed: 32px;
  --island-height-expanded: 140px;
  --island-top-offset: 80px;
}

/* Dark Theme */
[data-theme="dark"] {
  --qmf-bg-primary: #0f1419;
  --qmf-bg-secondary: #1a2332;
  --qmf-bg-tertiary: #2d3748;
  --qmf-bg-glass: rgba(15, 20, 25, 0.85);
  --qmf-bg-glass-strong: rgba(15, 20, 25, 0.95);
  
  --qmf-text-primary: #f7fafc;
  --qmf-text-secondary: #e2e8f0;
  --qmf-text-muted: #a0aec0;
  --qmf-text-inverse: #0f1419;
  
  --qmf-accent-glow: rgba(14, 165, 233, 0.35);
  
  --qmf-border: rgba(255, 255, 255, 0.08);
  --qmf-border-strong: rgba(255, 255, 255, 0.12);
  
  --qmf-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --qmf-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --qmf-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --qmf-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  --qmf-shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

/* =====================================================
   Base Styles
   ===================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--qmf-bg-primary);
  color: var(--qmf-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--qmf-transition), color var(--qmf-transition);
}

/* Accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  z-index: 100000;
  background: var(--qmf-accent-primary);
  color: white;
  padding: 12px 24px;
  border-radius: var(--qmf-border-radius-sm);
  outline: 3px solid var(--qmf-accent-secondary);
  text-decoration: none;
  font-weight: 600;
}

/* =====================================================
   Dynamic Island Banner - Below Header, Non-blocking
   ===================================================== */

.dynamic-island {
  position: fixed;
  top: var(--island-top-offset);
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  width: var(--island-width-collapsed);
  height: var(--island-height-collapsed);
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border-radius: var(--island-height-collapsed);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.dynamic-island::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  border-radius: inherit;
  pointer-events: none;
}

.dynamic-island:hover {
  width: var(--island-width-expanded);
  transform: translateX(-50%);
  box-shadow: 0 4px 20px rgba(8, 145, 178, 0.2);
}

.dynamic-island.expanded {
  width: var(--island-width-expanded);
  height: var(--island-height-expanded);
  border-radius: 16px;
}

.island-content {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  height: var(--island-height-collapsed);
}

.island-indicator {
  width: 6px;
  height: 6px;
  background: #10b981;
  border-radius: 50%;
  animation: pulse 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.island-main {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.island-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.island-icon svg {
  width: 100%;
  height: 100%;
  stroke: white;
}

.island-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.island-title {
  font-size: 11px;
  font-weight: 600;
  color: white;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.island-subtitle {
  font-size: 9px;
  color: rgba(255, 255, 255, 0.6);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.island-action {
  flex-shrink: 0;
}

.island-close {
  width: 24px;
  height: 24px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--qmf-transition-fast);
}

.island-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.island-close svg {
  width: 14px;
  height: 14px;
  stroke: white;
}

.island-expanded {
  display: none;
  padding: 50px 16px 16px;
}

.dynamic-island.expanded .island-expanded {
  display: block;
}

.island-expanded-content {
  color: white;
  font-size: 13px;
  line-height: 1.5;
}

.island-expanded-content h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.island-expanded-content p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 12px;
}

.island-expanded-content .island-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--qmf-accent-gradient);
  color: white;
  text-decoration: none;
  border-radius: var(--qmf-border-radius-full);
  font-size: 12px;
  font-weight: 600;
  transition: transform var(--qmf-transition-fast);
}

.island-expanded-content .island-cta:hover {
  transform: scale(1.05);
}

/* Island hidden state */
.dynamic-island.hidden {
  transform: translateX(-50%) translateY(-100px);
  opacity: 0;
  pointer-events: none;
}

/* =====================================================
   Background Effects - Modern Animated Gradient
   ===================================================== */

.qmf-background {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: var(--qmf-bg-primary);
}

/* Fallback solid color if animations don't load */
.qmf-background::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, 
    var(--qmf-bg-primary) 0%, 
    var(--qmf-bg-secondary) 50%, 
    var(--qmf-bg-tertiary) 100%);
  z-index: 0;
}

/* Chinese Cultural Pattern Background - Paper Cut Style */
.gradient-mesh {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.12;
  /* Great Wall silhouette pattern */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='200' viewBox='0 0 400 200'%3E%3Cg fill='none' stroke='%230891b2' stroke-width='1'%3E%3C!-- Great Wall towers --%3E%3Cpath d='M0 180 L20 180 L20 160 L30 160 L30 150 L40 150 L40 160 L50 160 L50 180 L80 180 L80 165 L90 165 L90 155 L100 155 L100 165 L110 165 L110 180 L140 180 L140 160 L150 160 L150 150 L160 150 L160 160 L170 160 L170 180 L200 180'/%3E%3Cpath d='M200 180 L220 180 L220 165 L230 165 L230 155 L240 155 L240 165 L250 165 L250 180 L280 180 L280 160 L290 160 L290 150 L300 150 L300 160 L310 160 L310 180 L340 180 L340 165 L350 165 L350 155 L360 155 L360 165 L370 165 L370 180 L400 180'/%3E%3C!-- Mountain silhouette --%3E%3Cpath d='M0 190 Q50 170 100 185 Q150 160 200 180 Q250 165 300 175 Q350 155 400 170' stroke-width='0.5'/%3E%3C/g%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-position: bottom;
  background-size: 400px 200px;
}

/* Chinese paper cutting decorative pattern */
.hex-pattern {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.08;
  /* Traditional Chinese window lattice */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill='none' stroke='%230891b2' stroke-width='0.5'%3E%3C!-- Lattice pattern --%3E%3Crect x='5' y='5' width='20' height='20' rx='2'/%3E%3Crect x='35' y='5' width='20' height='20' rx='2'/%3E%3Crect x='5' y='35' width='20' height='20' rx='2'/%3E%3Crect x='35' y='35' width='20' height='20' rx='2'/%3E%3C!-- Inner decorations --%3E%3Ccircle cx='15' cy='15' r='5'/%3E%3Ccircle cx='45' cy='15' r='5'/%3E%3Ccircle cx='15' cy='45' r='5'/%3E%3Ccircle cx='45' cy='45' r='5'/%3E%3C!-- Corner connectors --%3E%3Cpath d='M25 15 L35 15 M15 25 L15 35 M45 25 L45 35 M25 45 L35 45'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 60px 60px;
}

/* Floating lanterns and clouds */
.gradient-orb {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.orb-1 {
  /* Cloud pattern top */
  opacity: 0.1;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='100' viewBox='0 0 200 100'%3E%3Cg fill='none' stroke='%230891b2' stroke-width='1'%3E%3C!-- Chinese cloud motif --%3E%3Cpath d='M20 60 Q30 40 50 50 Q60 30 80 45 Q90 35 100 50 Q120 40 130 55 Q140 45 150 60'/%3E%3Cpath d='M40 70 Q50 60 60 65 Q70 55 80 65'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 200px 100px;
  background-repeat: repeat-x;
  background-position: top 80px center;
  animation: cloudFloat 60s linear infinite;
}

.orb-2 {
  /* Lantern pattern */
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='120' viewBox='0 0 80 120'%3E%3Cg fill='none' stroke='%23dc2626' stroke-width='0.8'%3E%3C!-- Lantern shape --%3E%3Cellipse cx='40' cy='60' rx='15' ry='25'/%3E%3Cpath d='M25 60 Q20 60 20 55 Q20 50 25 50'/%3E%3Cpath d='M55 60 Q60 60 60 55 Q60 50 55 50'/%3E%3C!-- Top cap --%3E%3Cpath d='M30 35 L50 35 L48 40 L32 40 Z'/%3E%3Cpath d='M35 30 L45 30 L45 35 L35 35 Z'/%3E%3C!-- Bottom tassel --%3E%3Cpath d='M38 85 L38 100 M40 85 L40 105 M42 85 L42 100'/%3E%3Crect x='35' y='82' width='10' height='5' rx='1'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 80px 120px;
  background-position: 90% 15%;
  background-repeat: no-repeat;
}

.orb-3 {
  /* Bamboo pattern side */
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='300' viewBox='0 0 60 300'%3E%3Cg fill='none' stroke='%2310b981' stroke-width='1'%3E%3C!-- Bamboo stalk --%3E%3Cpath d='M30 0 L30 300'/%3E%3C!-- Nodes --%3E%3Cellipse cx='30' cy='50' rx='8' ry='3'/%3E%3Cellipse cx='30' cy='120' rx='8' ry='3'/%3E%3Cellipse cx='30' cy='190' rx='8' ry='3'/%3E%3Cellipse cx='30' cy='260' rx='8' ry='3'/%3E%3C!-- Leaves --%3E%3Cpath d='M30 50 Q45 40 55 55 Q45 55 30 50'/%3E%3Cpath d='M30 120 Q15 110 5 125 Q15 125 30 120'/%3E%3Cpath d='M30 190 Q45 180 55 195 Q45 195 30 190'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 60px 300px;
  background-position: 5% center;
  background-repeat: repeat-y;
}

@keyframes cloudFloat {
  0% { background-position-x: 0; }
  100% { background-position-x: 200px; }
}

/* Chinese coin/seal watermark pattern */
.grid-pattern {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill='none' stroke='%23dc2626' stroke-width='0.5'%3E%3C!-- Chinese coin shape --%3E%3Ccircle cx='50' cy='50' r='35'/%3E%3Ccircle cx='50' cy='50' r='30'/%3E%3Crect x='42' y='42' width='16' height='16'/%3E%3C!-- 福 character simplified strokes --%3E%3Cpath d='M20 20 L20 35 M15 25 L25 25'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 150px 150px;
}

/* Noise texture overlay */
.noise-overlay {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.015;
  pointer-events: none;
  z-index: 3;
}

/* Dark theme - slightly more visible patterns */
[data-theme="dark"] .gradient-mesh,
[data-theme="dark"] .hex-pattern,
[data-theme="dark"] .gradient-orb,
[data-theme="dark"] .grid-pattern {
  opacity: 0.06;
}

[data-theme="dark"] .orb-1 { opacity: 0.04; }
[data-theme="dark"] .orb-2 { opacity: 0.035; }
[data-theme="dark"] .orb-3 { opacity: 0.03; }

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .orb-1 {
    animation: none;
  }
}

/* =====================================================
   Header
   ===================================================== */

.qmf-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--qmf-header-height);
  background: var(--qmf-bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--qmf-border);
  z-index: 99999;
  transition: all var(--qmf-transition);
}

.qmf-header.scrolled {
  background: var(--qmf-bg-glass-strong);
  box-shadow: var(--qmf-shadow-md);
}

.header-container {
  max-width: var(--qmf-container-max);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

/* Logo */
.qmf-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  position: relative;
}

.logo-glow {
  position: absolute;
  width: 60px;
  height: 60px;
  background: var(--qmf-accent-gradient);
  border-radius: 50%;
  filter: blur(20px);
  opacity: 0.3;
  left: -10px;
  top: 50%;
  transform: translateY(-50%);
  transition: opacity var(--qmf-transition);
}

.qmf-logo:hover .logo-glow {
  opacity: 0.5;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: contain;
  position: relative;
  z-index: 1;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--qmf-text-primary);
  position: relative;
  z-index: 1;
}

.logo-accent {
  background: var(--qmf-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Navigation */
.qmf-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  color: var(--qmf-text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--qmf-border-radius-sm);
  transition: all var(--qmf-transition-fast);
  position: relative;
}

.nav-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.nav-item:hover {
  color: var(--qmf-text-primary);
  background: var(--qmf-bg-tertiary);
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 24px;
  height: 2px;
  background: var(--qmf-accent-gradient);
  border-radius: 2px;
  transition: transform var(--qmf-transition);
}

.nav-item:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.qmf-btn-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--qmf-bg-tertiary);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius-sm);
  cursor: pointer;
  transition: all var(--qmf-transition-fast);
  position: relative;
}

.qmf-btn-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--qmf-text-secondary);
  transition: stroke var(--qmf-transition-fast);
}

.qmf-btn-icon:hover {
  background: var(--qmf-bg-secondary);
  border-color: var(--qmf-border-strong);
}

.qmf-btn-icon:hover svg {
  stroke: var(--qmf-text-primary);
}

/* Theme Toggle */
#themeToggle .icon-sun {
  display: block;
}

#themeToggle .icon-moon {
  display: none;
}

[data-theme="dark"] #themeToggle .icon-sun {
  display: none;
}

[data-theme="dark"] #themeToggle .icon-moon {
  display: block;
}

/* Notification Badge */
.notification-btn {
  position: relative;
}

.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 18px;
  height: 18px;
  background: var(--qmf-error);
  color: white;
  font-size: 10px;
  font-weight: 700;
  border-radius: var(--qmf-border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

/* Auth Buttons */
.auth-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qmf-btn-outline {
  padding: 10px 20px;
  background: transparent;
  border: 1px solid var(--qmf-border-strong);
  color: var(--qmf-text-primary);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--qmf-border-radius-sm);
  cursor: pointer;
  transition: all var(--qmf-transition-fast);
}

.qmf-btn-outline:hover {
  background: var(--qmf-bg-tertiary);
  border-color: var(--qmf-accent-primary);
}

.qmf-btn-primary {
  padding: 10px 20px;
  background: var(--qmf-accent-gradient);
  border: none;
  color: white;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--qmf-border-radius-sm);
  cursor: pointer;
  transition: all var(--qmf-transition-fast);
  box-shadow: 0 4px 15px var(--qmf-accent-glow);
}

.qmf-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--qmf-accent-glow);
}

/* User Menu */
.user-menu {
  position: relative;
}
.user-menu.hidden {
  display: none;
}

.user-avatar-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  background: var(--qmf-bg-tertiary);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius-full);
  cursor: pointer;
  transition: all var(--qmf-transition-fast);
}

.user-avatar-btn:hover {
  background: var(--qmf-bg-secondary);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.user-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--qmf-text-primary);
}

/* User Dropdown */
.user-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 200px;
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border);
  border-radius: 12px;
  box-shadow: 0 12px 28px rgba(0,0,0,.12);
  padding: 6px;
  display: none;
  z-index: 1200;
}
.user-dropdown.open {
  display: block;
}
.user-dropdown__item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  background: transparent;
  color: var(--qmf-text-primary);
  font-size: .85rem;
  border-radius: 8px;
  padding: 9px 10px;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
}
.user-dropdown__item:hover {
  background: var(--qmf-bg-tertiary);
}
.user-dropdown__item i {
  width: 16px;
  text-align: center;
  color: var(--qmf-text-muted);
}
.user-dropdown__divider {
  height: 1px;
  margin: 4px 2px;
  background: var(--qmf-border);
}
.user-dropdown__item--danger {
  color: #ef4444;
}
.user-dropdown__item--danger i {
  color: #ef4444;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  background: var(--qmf-bg-tertiary);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius-sm);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px;
}

.mobile-menu-btn span {
  width: 100%;
  height: 2px;
  background: var(--qmf-text-primary);
  border-radius: 2px;
  transition: all var(--qmf-transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* =====================================================
   Sidebar (Mobile)
   ===================================================== */

.qmf-sidebar {
  position: fixed;
  top: 0;
  right: -100%;
  width: var(--qmf-sidebar-width);
  height: 100vh;
  background: var(--qmf-bg-primary);
  z-index: 100000;
  transition: right var(--qmf-transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--qmf-shadow-xl);
}

.qmf-sidebar.open {
  right: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  border-bottom: 1px solid var(--qmf-border);
}

.sidebar-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--qmf-text-primary);
}

.sidebar-close {
  width: 36px;
  height: 36px;
  background: var(--qmf-bg-tertiary);
  border: none;
  border-radius: var(--qmf-border-radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar-close svg {
  width: 20px;
  height: 20px;
  stroke: var(--qmf-text-secondary);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  color: var(--qmf-text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--qmf-border-radius-sm);
  transition: all var(--qmf-transition-fast);
  margin-bottom: 4px;
}

.sidebar-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-link:hover {
  color: var(--qmf-text-primary);
  background: var(--qmf-bg-tertiary);
}

.sidebar-link.hot {
  position: relative;
}

.hot-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  color: white;
  border-radius: var(--qmf-border-radius-full);
  margin-left: auto;
}

.sidebar-auth {
  padding: 16px;
  border-top: 1px solid var(--qmf-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.full-width {
  width: 100%;
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 99999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--qmf-transition);
}

.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* =====================================================
   Main Content
   ===================================================== */

.qmf-main {
  padding-top: var(--qmf-header-height);
  min-height: 100vh;
}

/* =====================================================
   Hero Section
   ===================================================== */

.qmf-hero {
  padding: 40px 0 30px;
  position: relative;
  overflow: hidden;
}

.hero-container {
  max-width: var(--qmf-container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--qmf-bg-glass);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius-full);
  margin-bottom: 12px;
  backdrop-filter: blur(10px);
}

.badge-icon {
  font-size: 16px;
}

.badge-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--qmf-text-secondary);
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 12px;
}

.title-line {
  display: block;
  color: var(--qmf-text-primary);
}

.title-gradient {
  display: block;
  background: var(--qmf-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-description {
  font-size: 14px;
  color: var(--qmf-text-secondary);
  margin-bottom: 16px;
  max-width: 450px;
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.qmf-btn-large {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--qmf-border-radius);
  text-decoration: none;
  transition: all var(--qmf-transition);
  cursor: pointer;
  border: none;
}

.qmf-btn-large svg {
  width: 16px;
  height: 16px;
}

.qmf-btn-large.primary {
  background: var(--qmf-accent-gradient);
  color: white;
  box-shadow: 0 8px 30px var(--qmf-accent-glow);
}

.qmf-btn-large.primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px var(--qmf-accent-glow);
}

.qmf-btn-large.secondary {
  background: var(--qmf-bg-glass);
  color: var(--qmf-text-primary);
  border: 1px solid var(--qmf-border);
  backdrop-filter: blur(10px);
}

.qmf-btn-large.secondary:hover {
  background: var(--qmf-bg-tertiary);
  border-color: var(--qmf-accent-primary);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--qmf-text-primary);
  line-height: 1;
}

.stat-suffix {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--qmf-accent-primary);
}

.stat-label {
  font-size: 13px;
  color: var(--qmf-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--qmf-border);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  height: 280px;
}

.visual-card {
  position: absolute;
  background: var(--qmf-bg-glass-strong);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius-lg);
  backdrop-filter: blur(20px);
  box-shadow: var(--qmf-shadow-lg);
}

.main-card {
  width: 240px;
  height: 260px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  overflow: hidden;
}

.card-glow {
  position: absolute;
  inset: -50%;
  background: var(--qmf-accent-gradient);
  opacity: 0.1;
  filter: blur(60px);
  animation: rotate 10s linear infinite;
}

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

.flashcard-container {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
}

.flashcard {
  width: 200px;
  height: 220px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s;
  cursor: pointer;
}

.flashcard:hover {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  border-radius: var(--qmf-border-radius);
  background: var(--qmf-bg-secondary);
}

.flashcard-back {
  transform: rotateY(180deg);
  background: var(--qmf-accent-gradient);
  color: white;
}

.hanzi {
  font-size: 3.5rem;
  font-weight: 700;
  font-family: 'Ma Shan Zheng', cursive;
  background: var(--qmf-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
}

.pinyin {
  font-size: 1.2rem;
  color: var(--qmf-text-secondary);
}

.meaning {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.example {
  font-size: 1rem;
  opacity: 0.9;
  text-align: center;
}

/* Floating Cards */
.float-card {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: floatCard 6s ease-in-out infinite;
}

.float-emoji {
  font-size: 24px;
}

.float-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--qmf-text-primary);
  white-space: nowrap;
}

.card-1 {
  top: 10%;
  right: 10%;
  z-index: 2;
  animation-delay: 0s;
}

.card-2 {
  bottom: 25%;
  left: 5%;
  z-index: 2;
  animation-delay: -2s;
}

.card-3 {
  bottom: 10%;
  right: 15%;
  z-index: 2;
  animation-delay: -4s;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

/* =====================================================
   Sections
   ===================================================== */

.qmf-section {
  padding: 40px 0;
}

.section-container {
  max-width: var(--qmf-container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  margin-bottom: 20px;
}

.section-header.centered {
  text-align: center;
}

.section-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--qmf-text-primary);
  margin-bottom: 6px;
}

.section-subtitle {
  font-size: 13px;
  color: var(--qmf-text-secondary);
  max-width: 500px;
}

.section-header.centered .section-subtitle {
  margin: 0 auto;
}

.section-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--qmf-accent-primary);
  text-decoration: none;
  transition: color var(--qmf-transition-fast);
}

.section-link:hover {
  color: var(--qmf-accent-secondary);
}

.section-header:has(.section-link) {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* =====================================================
   Quick Grid - Minimal Compact Tags
   ===================================================== */

.quick-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.quick-card {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px 6px 8px;
  background: var(--qmf-bg-glass);
  border: 1px solid var(--qmf-border);
  border-radius: 20px;
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
  font-size: 12px;
}

.quick-card::before {
  display: none;
}

.quick-card:hover {
  border-color: var(--qmf-accent-primary);
  background: var(--qmf-bg-glass-strong);
}

.quick-card.featured {
  background: var(--qmf-accent-gradient);
  border: none;
  padding: 6px 14px 6px 8px;
}

.quick-card.featured:hover {
  opacity: 0.9;
}

.quick-card.featured .card-title,
.quick-card.featured .card-arrow {
  color: white;
}

.quick-card.featured .card-icon {
  background: rgba(255, 255, 255, 0.2);
  border: none;
}

.quick-card.featured .card-icon svg {
  stroke: white;
}

.quick-card.featured .card-desc {
  display: none;
}

.quick-card.hot {
  position: relative;
}

.hot-label {
  position: absolute;
  top: -3px;
  right: 6px;
  font-size: 6px;
  font-weight: 700;
  padding: 1px 4px;
  background: #ef4444;
  color: white;
  border-radius: 8px;
}

@keyframes hotPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.card-icon-wrapper {
  flex-shrink: 0;
}

.card-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 145, 178, 0.1);
  border-radius: 50%;
  border: none;
}

.card-icon svg {
  width: 11px;
  height: 11px;
  stroke: var(--qmf-accent-primary);
}

.quick-card:hover .card-icon {
  background: var(--qmf-accent-primary);
  border-color: var(--qmf-accent-primary);
  transform: rotate(5deg);
}

.quick-card:hover .card-icon svg {
  stroke: white;
}

.card-content {
  flex: 1;
  min-width: 0;
}

.card-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--qmf-text-primary);
  white-space: nowrap;
  line-height: 1;
}

.card-desc {
  display: none;
}

.card-arrow {
  display: none;
}

/* =====================================================
   HSK Levels
   ===================================================== */

.hsk-section {
  background: var(--qmf-bg-secondary);
}

.hsk-levels {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}

.hsk-card {
  display: flex;
  flex-direction: column;
  padding: 14px 12px;
  background: var(--qmf-bg-primary);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius);
  text-decoration: none;
  transition: all var(--qmf-transition);
  text-align: center;
}

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

.hsk-badge {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 6px;
  background: var(--qmf-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hsk-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.hsk-words {
  font-size: 14px;
  font-weight: 600;
  color: var(--qmf-text-primary);
}

.hsk-desc {
  font-size: 12px;
  color: var(--qmf-text-muted);
}

.hsk-progress {
  height: 4px;
  background: var(--qmf-bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: var(--progress, 0%);
  background: var(--qmf-accent-gradient);
  border-radius: 2px;
  transition: width 0.5s ease;
}

/* Level colors */
.level-1:hover { border-color: #10b981; }
.level-2:hover { border-color: #3b82f6; }
.level-3:hover { border-color: #8b5cf6; }
.level-4:hover { border-color: #f59e0b; }
.level-5:hover { border-color: #ef4444; }
.level-6:hover { border-color: #ec4899; }

/* =====================================================
   News Section
   ===================================================== */

.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.news-card {
  background: var(--qmf-bg-glass);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius);
  overflow: hidden;
  transition: all var(--qmf-transition);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--qmf-shadow-lg);
}

.news-card.featured-news {
  grid-column: span 1;
}

.news-image {
  position: relative;
  height: 180px;
  overflow: hidden;
}

.news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--qmf-transition);
}

.news-card:hover .news-image img {
  transform: scale(1.05);
}

.news-category {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  background: var(--qmf-accent-gradient);
  color: white;
  border-radius: var(--qmf-border-radius-full);
}

.news-content {
  padding: 20px;
}

.news-date {
  font-size: 12px;
  color: var(--qmf-text-muted);
  display: block;
  margin-bottom: 8px;
}

.news-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--qmf-text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.news-excerpt {
  font-size: 14px;
  color: var(--qmf-text-secondary);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--qmf-accent-primary);
  text-decoration: none;
}

.news-link:hover {
  text-decoration: underline;
}

/* =====================================================
   Features Section
   ===================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--qmf-bg-glass);
  border: 1px solid var(--qmf-border);
  border-radius: var(--qmf-border-radius);
  transition: all var(--qmf-transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--qmf-accent-primary);
  box-shadow: var(--qmf-shadow-md);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--qmf-accent-gradient);
  border-radius: var(--qmf-border-radius);
  box-shadow: 0 8px 20px var(--qmf-accent-glow);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke: white;
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--qmf-text-primary);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--qmf-text-secondary);
}

/* =====================================================
   CTA Section
   ===================================================== */

.cta-section {
  padding: 30px 0 50px;
}

.cta-card {
  background: var(--qmf-accent-gradient);
  border-radius: var(--qmf-border-radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 500px;
}

.cta-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}

.cta-desc {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 16px;
}

.cta-buttons {
  display: flex;
  gap: 10px;
}

.cta-buttons .qmf-btn-large.primary {
  background: white;
  color: var(--qmf-accent-primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta-buttons .qmf-btn-large.secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta-decoration {
  position: relative;
  z-index: 1;
  text-align: center;
}

.cta-hanzi {
  display: block;
  font-size: 5rem;
  font-weight: 800;
  font-family: 'Ma Shan Zheng', cursive;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1;
}

.cta-meaning {
  display: block;
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
}

/* =====================================================
   Footer - QMF UI Style
   ===================================================== */

.qmf-footer {
  background: linear-gradient(180deg, var(--qmf-bg-secondary) 0%, var(--qmf-bg-tertiary) 100%);
  border-top: 1px solid var(--qmf-border);
  position: relative;
  overflow: hidden;
}

.footer-wave {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  color: var(--qmf-bg-primary);
  transform: translateY(-99%);
}

.footer-wave svg {
  width: 100%;
  height: 100%;
}

.footer-container {
  max-width: var(--qmf-container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.footer-main {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  padding: 28px 0 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  margin-bottom: 8px;
}

.footer-logo img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(8, 145, 178, 0.15);
}

.footer-logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.footer-logo-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--qmf-text-primary);
  line-height: 1.2;
}

.footer-logo-badge {
  font-size: 9px;
  font-weight: 700;
  color: white;
  background: var(--qmf-accent-gradient);
  padding: 2px 6px;
  border-radius: 4px;
  width: fit-content;
  letter-spacing: 0.5px;
}

.footer-tagline {
  font-size: 11px;
  color: var(--qmf-text-muted);
  margin-bottom: 10px;
  line-height: 1.4;
}

.footer-social {
  display: flex;
  gap: 6px;
}

.social-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--qmf-bg-glass);
  border: 1px solid var(--qmf-border);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.social-btn:hover {
  background: var(--qmf-accent-primary);
  border-color: var(--qmf-accent-primary);
}

.social-btn svg {
  width: 12px;
  height: 12px;
  fill: var(--qmf-text-secondary);
  transition: fill 0.2s ease;
}

.social-btn:hover svg {
  fill: white;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.footer-column h4 {
  font-size: 10px;
  font-weight: 700;
  color: var(--qmf-accent-primary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-column a {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--qmf-text-secondary);
  text-decoration: none;
  padding: 3px 0;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--qmf-accent-primary);
}

.footer-column .link-icon {
  font-size: 10px;
  opacity: 0.7;
}

.footer-column a:hover .link-icon {
  opacity: 1;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-top: 1px solid var(--qmf-border);
  font-size: 12px;
  color: var(--qmf-text-muted);
}

.footer-bottom-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-separator {
  opacity: 0.4;
}

.footer-tech strong {
  color: var(--qmf-accent-primary);
  font-weight: 600;
}

.footer-bottom-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* =====================================================
   Responsive Design
   ===================================================== */

@media (max-width: 1200px) {
  .quick-grid {
    gap: 6px;
  }
  
  .hsk-levels {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  .qmf-nav {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-visual {
    height: 400px;
    order: -1;
  }
  
  .footer-main {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --island-width-collapsed: 200px;
    --island-width-expanded: calc(100vw - 32px);
    --island-height-expanded: 160px;
  }
  
  .dynamic-island {
    max-width: calc(100vw - 32px);
    top: calc(var(--qmf-header-height) + 8px);
  }
  
  .qmf-hero {
    padding: 60px 0 40px;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .stat-divider {
    display: none;
  }
  
  .quick-grid {
    gap: 6px;
  }
  
  .quick-card {
    padding: 6px 12px 6px 8px;
  }
  
  .quick-card.featured {
    padding: 8px 16px 8px 10px;
  }
  
  .card-icon {
    width: 24px;
    height: 24px;
  }
  
  .card-icon svg {
    width: 12px;
    height: 12px;
  }
  
  .card-title {
    font-size: 11px;
  }
  
  .hsk-levels {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-card {
    flex-direction: column;
    text-align: center;
    padding: 40px 24px;
  }
  
  .cta-decoration {
    margin-top: 32px;
  }
  
  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  
  .auth-buttons {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0 16px;
  }
  
  .section-container {
    padding: 0 16px;
  }
  
  .qmf-section {
    padding: 60px 0;
  }
  
  .hsk-levels {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  
  .hsk-card {
    padding: 16px 12px;
  }
  
  .hsk-badge {
    font-size: 1.25rem;
  }
  
  .main-card {
    width: 280px;
    height: 360px;
  }
  
  .flashcard {
    width: 240px;
    height: 300px;
  }
  
  .hanzi {
    font-size: 4rem;
  }
}

/* =====================================================
   Animations
   ===================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.qmf-hero .hero-content > * {
  animation: fadeInUp 0.6s ease backwards;
}

.qmf-hero .hero-badge { animation-delay: 0.1s; }
.qmf-hero .hero-title { animation-delay: 0.2s; }
.qmf-hero .hero-description { animation-delay: 0.3s; }
.qmf-hero .hero-cta { animation-delay: 0.4s; }
.qmf-hero .hero-stats { animation-delay: 0.5s; }

.hero-visual {
  animation: fadeIn 0.8s ease 0.3s backwards;
}

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