:root{
  /* Primary */
  --color-primary: #0f62fe;
  --color-primary-hover: #0353e9;
  --color-primary-light: #d0e2ff;
  --color-primary-dark: #001d6c;
  --color-primary-dark-hover: #001450;

  /* Neutral */
  --color-bg: #ffffff;
  --color-bg-secondary: #f4f4f4;
  --color-surface: #ffffff;
  --color-border: #e0e0e0;
  --color-border-strong: #c6c6c6;
  --color-text-primary: #161616;
  --color-text-secondary: #525252;
  --color-text-placeholder: #8d8d8d;
  --color-text-inverse: #ffffff;

  /* Semantic */
  --color-success: #24a148;
  --color-warning: #f1c21b;
  --color-error: #da1e28;

  /* Typography */
  --font-stack: 'Noto Sans SC', 'IBM Plex Sans', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Cascadia Code', monospace;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Layout */
  --container-max: 1200px;
  --nav-height: 80px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

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


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

body {
  font-family: var(--font-stack);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul { list-style: none; }


@media (max-width: 1024px) {
  :root { --nav-height: 56px; }
}