:root {
  --primary: #0EA5E9;
  --primary-dark: #0284C7;
  --primary-light: rgba(14, 165, 233, 0.1);
  --secondary: #06B6D4;
  --accent: #22D3EE;

  --bg-primary: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-gradient-start: #0EA5E9;
  --bg-gradient-end: #06B6D4;

  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;

  --border: #E2E8F0;
  --border-light: rgba(255, 255, 255, 0.2);

  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;

  --glass-bg: rgba(255, 255, 255, 0.15);
  --glass-bg-dark: rgba(15, 23, 42, 0.15);
  --glass-border: rgba(255, 255, 255, 0.25);
  --glass-blur: 16px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  --transition-fast: 150ms ease-out;
  --transition-default: 200ms ease-out;
  --transition-slow: 300ms ease-out;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
}

.glass-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.glass-card-dark {
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
}

.gradient-bg {
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

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

.slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

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

.spin {
  animation: spin 1s linear infinite;
}

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

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

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

.hover-lift {
  transition: transform var(--transition-default), box-shadow var(--transition-default);
}

.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hover-scale {
  transition: transform var(--transition-default);
}

.hover-scale:hover {
  transform: scale(1.02);
}

.hover-scale:active {
  transform: scale(0.98);
}

.no-scrollbar::-webkit-scrollbar {
  display: none;
}

.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.pb-safe {
  padding-bottom: env(safe-area-inset-bottom);
}

.mb-safe {
  margin-bottom: env(safe-area-inset-bottom);
}

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

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

/* HTMX 加载指示器 */
.htmx-indicator {
  opacity: 0;
  transition: opacity 200ms ease-out;
}

.htmx-request .htmx-indicator {
  opacity: 1;
}

.htmx-request.htmx-indicator {
  opacity: 1;
}

/* 表单图标定位 */
.input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: #94A3B8;
  pointer-events: none;
}

/* 登录/注册页面背景 */
.login-bg {
  background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 50%, #22D3EE 100%);
}

/* 登录卡片 */
.login-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* 浮动动画 */
.floating {
  animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* 导航项样式（保留用于兼容） */
.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 100%;
  gap: 4px;
  cursor: pointer;
  transition: color 200ms ease-out;
  -webkit-tap-highlight-color: transparent;
}

.nav-item img {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.nav-item span {
  font-size: 10px;
  font-weight: 500;
  transition: color 200ms ease-out;
}

.nav-item.inactive {
  color: #94A3B8;
}

.nav-item.inactive:hover {
  color: #64748B;
}

.nav-item.active {
  color: #0EA5E9;
}

/* 现代导航项样式（浮动胶囊导航栏） */
.nav-item-modern {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 100%;
  gap: 4px;
  cursor: pointer;
  transition: all 250ms ease-out;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  border-radius: 1.5rem;
  padding: 0.5rem 1rem;
}

.nav-item-modern svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: all 250ms ease-out;
  color: #94A3B8;
}

.nav-item-modern span {
  font-size: 11px;
  font-weight: 500;
  transition: all 250ms ease-out;
  color: #94A3B8;
}

.nav-item-modern.inactive {
  background: transparent;
}

.nav-item-modern.inactive:hover {
  background: rgba(14, 165, 233, 0.05);
}

.nav-item-modern.inactive:hover svg {
  color: #64748B;
}

.nav-item-modern.inactive:hover span {
  color: #64748B;
}

.nav-item-modern.active {
  background: rgba(14, 165, 233, 0.08);
}

.nav-item-modern.active svg {
  transform: scale(1.15);
  color: #0EA5E9;
}

.nav-item-modern.active span {
  color: #0EA5E9;
  font-weight: 600;
}

/* 主按钮渐变背景 */
.btn-gradient {
  background: linear-gradient(135deg, #0EA5E9 0%, #0284C7 100%);
}

/* AI 消息气泡 */
.ai-avatar {
  background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
}

/* 用户消息气泡 */
.user-message-bubble {
  background: linear-gradient(135deg, #0EA5E9 0%, #06B6D4 100%);
}

/* Alpine x-cloak 支持 */
[x-cloak] {
  display: none !important;
}

/* 输入框字体大小（iOS 安全设置） */
input, textarea, select {
  font-size: 16px !important;
}

/* 图标着色 - 用于 <img> 标签的 SVG 图标 */
.icon-primary {
  filter: brightness(0) saturate(100%) invert(44%) sepia(77%) saturate(1603%) hue-rotate(167deg) brightness(98%) contrast(96%);
}

.icon-slate {
  filter: brightness(0) saturate(100%) invert(53%) sepia(6%) saturate(976%) hue-rotate(184deg) brightness(94%) contrast(86%);
}