/* 基本スタイル。システムフォント・ダークモード対応・safe-area考慮。 */

:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --text: #1b2a3a;
  --muted: #5a6b7d;
  --border: #dbe3ec;
  --accent: #0f5aa0;
  --focus: #0f5aa0;

  --lv5-bg: #e3f4e6;
  --lv5-fg: #185c2a;
  --lv4-bg: #eaf3e0;
  --lv4-fg: #3d5c18;
  --lv3-bg: #fdf3d7;
  --lv3-fg: #7a5a10;
  --lv2-bg: #fde8d7;
  --lv2-fg: #8a4410;
  --lv1-bg: #fadfdf;
  --lv1-fg: #8f1f1f;
  --lvnone-bg: #eef1f5;
  --lvnone-fg: #4a5a6a;

  --alert-bg: #b3261e;
  --alert-fg: #ffffff;
  --caution-bg: #f6c445;
  --caution-fg: #4a3400;
  --none-bg: #e6efe7;
  --none-fg: #2c5236;
  --unavail-bg: #4b5563;
  --unavail-fg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10161d;
    --panel: #1a232e;
    --text: #e8eef4;
    --muted: #9fb0c0;
    --border: #2c3947;
    --accent: #6db3ee;
    --focus: #8fc5f5;

    --lv5-bg: #17351f;
    --lv5-fg: #9fdcae;
    --lv4-bg: #22331a;
    --lv4-fg: #bcd98f;
    --lv3-bg: #3a2f12;
    --lv3-fg: #ecd188;
    --lv2-bg: #402a14;
    --lv2-fg: #f0b988;
    --lv1-bg: #421c1c;
    --lv1-fg: #f2a3a3;
    --lvnone-bg: #232c36;
    --lvnone-fg: #a5b4c3;

    --none-bg: #1c2f22;
    --none-fg: #a8d5b3;
    --caution-bg: #6b5417;
    --caution-fg: #ffe8a8;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
}

h1, h2, h3 {
  margin: 0;
  font-weight: 650;
}

button {
  font: inherit;
}

a {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.82rem;
}