:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --secondary-color: #0f172a;
  --secondary-soft: #f8fafc;

  --gray-25: #fcfdff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-150: #e9eef5;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  --success-500: #22c55e;
  --success-600: #16a34a;
  --warning-500: #f59e0b;
  --warning-600: #d97706;
  --error-500: #ef4444;
  --error-600: #dc2626;
  --info-500: #0ea5e9;
  --info-600: #0284c7;

  --white: #ffffff;
  --black: #000000;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 28px;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 14px 34px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 22px 48px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 28px 64px rgba(15, 23, 42, 0.12);

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);

  --font-sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 24%),
    radial-gradient(circle at bottom right, rgba(14, 165, 233, 0.08), transparent 22%),
    linear-gradient(180deg, #f7faff 0%, #f8fafc 58%, #f4f7fb 100%);
  color: var(--gray-800);
  line-height: 1.6;
}

a {
  color: inherit;
}

svg {
  display: block;
}

.ui-icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ui-icon-lg {
  width: 22px;
  height: 22px;
}

.ui-icon-xl {
  width: 28px;
  height: 28px;
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-18px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

.animate-slide-in-left {
  animation: slideInLeft var(--transition-slow) ease-out;
}