/* ============================================
   办公协同平台 - 设计系统 (Design System)
   ============================================ */

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

/* ---- CSS Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif; line-height: 1.5; color: var(--text-primary); background: var(--bg-main); overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; outline: none; border: none; }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-quaternary); }

/* ---- Color System (Light Theme) ---- */
:root {
  /* Primary */
  --primary-50: #EEF2FF;
  --primary-100: #D8E2FE;
  --primary-200: #B3C7FD;
  --primary-300: #7FA0FB;
  --primary-400: #4D7BF7;
  --primary-500: #2B5CE6;
  --primary-600: #1E45C4;
  --primary-700: #17369E;
  --primary-800: #122B7A;
  --primary-900: #0D1F5A;

  /* Success (Green) */
  --success-50: #ECFDF5;
  --success-100: #D1FAE5;
  --success-500: #10B981;
  --success-600: #059669;
  --success-700: #047857;

  /* Warning (Amber) */
  --warning-50: #FFFBEB;
  --warning-100: #FEF3C7;
  --warning-500: #F59E0B;
  --warning-600: #D97706;
  --warning-700: #B45309;

  /* Error (Red) */
  --error-50: #FEF2F2;
  --error-100: #FEE2E2;
  --error-500: #EF4444;
  --error-600: #DC2626;
  --error-700: #B91C1C;

  /* Info (Cyan) */
  --info-50: #ECFEFF;
  --info-100: #CFFAFE;
  --info-500: #06B6D4;
  --info-600: #0891B2;

  /* Neutral */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --gray-950: #030712;

  /* Semantic Aliases */
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-tertiary: #6B7280;
  --text-quaternary: #9CA3AF;
  --text-inverse: #FFFFFF;
  --text-link: var(--primary-500);

  --bg-main: #F5F6FA;
  --bg-surface: #FFFFFF;
  --bg-elevated: #FFFFFF;
  --bg-sidebar: #1E2235;
  --bg-sidebar-hover: #282D45;
  --bg-sidebar-active: #2B5CE6;
  --bg-hover: #F3F4F6;
  --bg-active: #EEF2FF;
  --bg-mask: rgba(0, 0, 0, 0.5);

  --border-color: #E5E7EB;
  --border-light: #F3F4F6;
  --border-focus: var(--primary-500);
  --divider: #E5E7EB;

  /* Specific */
  --online-color: #10B981;
  --offline-color: #9CA3AF;
  --busy-color: #EF4444;
  --away-color: #F59E0B;
  --msg-bubble-self: #2B5CE6;
  --msg-bubble-other: #F3F4F6;
  --msg-text-self: #FFFFFF;
  --msg-text-other: #1F2937;
  --call-bg: #111827;
  --call-btn-danger: #EF4444;
  --call-btn-active: rgba(255,255,255,0.15);
  --badge-bg: #EF4444;
  --badge-text: #FFF;

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

  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 0.875rem;  /* 14px */
  --text-md: 1rem;        /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.375rem;    /* 22px */
  --text-2xl: 1.75rem;    /* 28px */
  --text-3xl: 2.25rem;    /* 36px */

  --weight-light: 300;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* ---- Spacing ---- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* ---- Border Radius ---- */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* ---- Shadows ---- */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --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);
  --shadow-focus: 0 0 0 3px rgba(43, 92, 230, 0.15);

  /* ---- Transitions ---- */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.35s ease;
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ---- Z-Index ---- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;
  --z-call: 700;

  /* ---- Sizes ---- */
  --sidebar-width: 64px;
  --sidebar-expanded: 220px;
  --panel-width: 320px;
  --topbar-height: 56px;
  --avatar-xs: 24px;
  --avatar-sm: 32px;
  --avatar-md: 40px;
  --avatar-lg: 48px;
  --avatar-xl: 64px;
  --avatar-2xl: 96px;
}

/* ---- Dark Theme ---- */
[data-theme="dark"] {
  --text-primary: #F3F4F6;
  --text-secondary: #D1D5DB;
  --text-tertiary: #9CA3AF;
  --text-quaternary: #6B7280;
  --text-inverse: #111827;

  --bg-main: #0F1117;
  --bg-surface: #1A1D2E;
  --bg-elevated: #242840;
  --bg-sidebar: #0D0F1A;
  --bg-sidebar-hover: #1A1D2E;
  --bg-hover: #242840;
  --bg-active: #1E2A5A;

  --border-color: #2D3348;
  --border-light: #1F2440;
  --divider: #2D3348;

  --msg-bubble-other: #242840;
  --msg-text-other: #F3F4F6;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
}

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

.font-medium { font-weight: var(--weight-medium); }
.font-semibold { font-weight: var(--weight-semibold); }
.font-bold { font-weight: var(--weight-bold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-link { color: var(--text-link); }
.text-success { color: var(--success-500); }
.text-error { color: var(--error-500); }
.text-warning { color: var(--warning-500); }

.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; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-wrap { flex-wrap: wrap; }
.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); }

.grid { display: grid; }

.relative { position: relative; }
.absolute { position: absolute; }
.hidden { display: none !important; }
.visible { display: block; }
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.cursor-pointer { cursor: pointer; }
.select-none { user-select: none; }
.w-full { width: 100%; }
.h-full { height: 100%; }

.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }

.m-0 { margin: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.ml-auto { margin-left: auto; }
.mr-2 { margin-right: var(--space-2); }
.mr-3 { margin-right: var(--space-3); }

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

.border { border: 1px solid var(--border-color); }
.border-b { border-bottom: 1px solid var(--border-color); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.transition { transition: all var(--transition-normal); }

/* ---- Animations ---- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}
@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes ring {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.5; }
  100% { transform: scale(1.6); opacity: 0; }
}
@keyframes waveform {
  0%, 100% { height: 4px; }
  50% { height: 20px; }
}

.animate-fadeIn { animation: fadeIn var(--transition-normal) ease; }
.animate-fadeInUp { animation: fadeInUp var(--transition-normal) ease; }
.animate-scaleIn { animation: scaleIn var(--transition-normal) ease; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-spin { animation: spin 1s linear infinite; }