/* ==================== CSS Variables & Reset ==================== */
:root {
  --primary-color: #0052d9;
  --primary-hover: #003cab;
  --primary-light: #ecf2fe;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border-color: #e5e7eb;
  --bg-color: #ffffff;
  --sidebar-bg: #ffffff;
  --panel-bg: #f9fafb;
  --card-bg: #ffffff;
  --hover-bg: #f3f4f6;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.5;
}

/* ==================== SVG Icons ==================== */
.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.icon-outline {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.icon-solid {
  fill: currentColor;
  stroke: none;
}

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #9ca3af;
}

/* ==================== Focus Indicators ==================== */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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

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

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