/* ===== AIFlow Design System ===== */
/* 设计方向：融合QwenPaw温暖科技感 + 极简主义 */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* CSS Custom Properties - Design Tokens */
:root {
  /* Colors - Light Theme */
  --color-bg-primary: #F8F9FB;
  --color-bg-secondary: #FFFFFF;
  --color-bg-tertiary: #F1F3F7;
  --color-bg-hover: #EBEEF3;
  --color-bg-active: #E3E7F0;

  --color-text-primary: #101214;
  --color-text-secondary: #545A65;
  --color-text-tertiary: #8B919E;
  --color-text-disabled: #BFC4CE;
  --color-text-inverse: #FFFFFF;

  --color-accent: #5B5FED;
  --color-accent-hover: #4A4ECC;
  --color-accent-light: #EEEDFF;
  --color-accent-subtle: #F6F5FF;

  --color-success: #219B5E;
  --color-success-light: #E6F7EE;
  --color-warning: #E8922C;
  --color-warning-light: #FEF4E8;
  --color-error: #D9383A;
  --color-error-light: #FDEBEB;
  --color-info: #3B82F6;
  --color-info-light: #EBF2FE;

  --color-border: #E3E6EB;
  --color-border-light: #EEF0F4;
  --color-border-hover: #CDD2DA;

  --color-sidebar-bg: #F5F6F9;
  --color-sidebar-hover: #EAECF2;
  --color-sidebar-active: #E1E3F0;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 48px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.06);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-4xl: 40px;
  --space-5xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 18px;
  --text-xl: 22px;
  --text-2xl: 28px;
  --text-3xl: 36px;

  /* Layout */
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;
  --header-height: 56px;
  --admin-sidebar-width: 220px;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
}

#root {
  height: 100vh;
  overflow: hidden;
}

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

a:hover {
  color: var(--color-accent-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-text-disabled);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Utility Classes */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.w-full { width: 100%; }
.h-full { height: 100%; }
.relative { position: relative; }
.absolute { position: absolute; }
.hidden { display: none; }
.pointer { cursor: pointer; }
.select-none { user-select: none; }

/* Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes slideLeft {
  from { opacity: 0; transform: translateX(8px); }
  to { opacity: 1; transform: translateX(0); }
}

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

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

.animate-fadeIn { animation: fadeIn var(--transition-normal); }
.animate-slideUp { animation: slideUp var(--transition-normal); }
.animate-slideDown { animation: slideDown var(--transition-normal); }
.animate-pulse { animation: pulse 2s ease infinite; }

/* Skeleton loading */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-hover) 50%, var(--color-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* Responsive breakpoints utility */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --sidebar-width: 64px;
  }
}

.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  font-size: 18px;
  color: var(--color-text-secondary);
  background: var(--color-bg-primary);
}