/* ═══════════════════════════════════════════
   Base Styles - Reset, Typography, Body
   ═══════════════════════════════════════════ */

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

* {
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.5;
  padding: 24px;
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* 微細な背景グラデーション */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(124, 58, 237, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* カスタムスクロールバー */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-sub); }

::selection {
  background: rgba(37, 99, 235, 0.15);
  color: var(--text-main);
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}