/* base.css — Design tokens + reset + default element styles */
:root {
  /* Color — core */
  --color-primary-dark: #22326e;
  --color-primary: #1c64f2;
  --color-primary-light: #e8f0fe;
  --color-primary-light-2: #b9cffb;

  --color-accent: #df4661;
  --color-accent-dark: #bc2630;

  --color-text-primary: #424242;
  --color-text-secondary: #757575;
  --color-white: #ffffff;
  --color-bg: #ffffff;
  --color-border: #e0e0e0;

  /* Color — extended */
  --color-primary-medium: #1447ac;
  --color-primary-light-3: #ebf3ff;
  --color-primary-light-4: #97b8f9;
  --color-border-light: #d3d3d3;
  --color-border-muted: #c2c2c2;
  --color-bg-alt: #f5f5f5;

  /* Breakpoints (min-width values; mobile = below --breakpoint-sm) */
  --breakpoint-sm: 768px;
  --breakpoint-md: 1024px;

  /* Layout — widths */
  --layout-container: 1440px;
  --layout-content: 1280px;
  --layout-prose: 1120px;
  --layout-mobile: 375px;
  --layout-mobile-content: 335px;
  --layout-mobile-narrow: 280px;

  /* Layout — horizontal padding */
  --layout-padding-inline: 80px;
  --layout-padding-inline-mobile: 20px;

  /* Spacing scale (8px base) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 40px;
  --space-3xl: 48px;
  --space-4xl: 60px;
  --space-5xl: 64px;
  --space-6xl: 80px;

  /* Typography — families */
  --font-main: "Noto Sans JP", sans-serif;
  --font-secondary: Helvetica, Arial, sans-serif;

  /* Typography — scale (semantic sizes, responsive rules in components) */
  --font-size-3xs: 10px;
  --font-size-2xs: 13px;
  --font-size-xs: 14px;
  --font-size-sm: 16px;
  --font-size-md: 18px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 28px;
  --font-size-3xl: 32px;
  --font-size-4xl: 40px;

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

  --line-height-body: 1.6;
  --line-height-body-relaxed: 1.75;
  --line-height-heading: 1.3;
  --line-height-nav: 1.4;
  --line-height-small: 20px;
  --line-height-tight: 1.5;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  /* Shadow — semantic elevation only */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-focus-primary: 0 0 0 3px rgba(28, 100, 242, 0.4);
  --shadow-focus-secondary: 0 0 0 3px rgb(222, 223, 226);
  --shadow-text-primary-dark: 0 1px 2px rgba(34, 50, 110, 0.4);

  /* Z-index */
  --z-index-base: 0;
  --z-index-raised: 1;
  --z-index-dropdown: 100;
  --z-index-floating: 900;
  --z-index-sticky: 1000;
  --z-index-overlay: 1001;

  /* Transition */
  --duration-fast: 0.15s;
  --duration-normal: 0.2s;
  --duration-slow: 0.35s;
  --duration-float: 0.4s;
  --easing-default: ease;
  --easing-emphasized: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  color: var(--color-text-primary);
  line-height: var(--line-height-body);
  margin: 0;
  background-color: var(--color-bg);
}

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

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

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