/* 色・余白・文字サイズのトークン。ライトを既定にし、OS の設定がダークなら差し替える。 */
:root {
  color-scheme: light dark;

  --color-bg: #f4f6f3;
  --color-surface: #ffffff;
  --color-surface-sunken: #eceff0;
  --color-text: #1d2521;
  --color-text-muted: #55605a;
  --color-border: #d6dcd7;
  --color-border-strong: #7a867f;
  --color-accent: #2d6a55;
  --color-accent-hover: #235544;
  --color-accent-text: #ffffff;
  --color-danger: #b3261e;
  --color-danger-hover: #8f1d17;
  --color-danger-soft: #fbe9e7;
  --color-warn: #8a5a00;
  --color-warn-soft: #fbf0d6;
  --color-ok: #1f6b3d;
  --color-ok-soft: #dff1e5;
  --color-focus: #1a5fb4;

  --font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Noto Sans JP", "Meiryo", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;

  --radius: 6px;
  --shadow-card: 0 1px 2px rgb(20 30 25 / 6%);
  --content-width: 56rem;
  --content-width-narrow: 30rem;
}

@media screen and (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121714;
    --color-surface: #1b221e;
    --color-surface-sunken: #151b17;
    --color-text: #e7ece8;
    --color-text-muted: #a0aba4;
    --color-border: #313a35;
    --color-border-strong: #6f7d75;
    --color-accent: #86cdb0;
    --color-accent-hover: #a2dcc4;
    --color-accent-text: #0e1b15;
    --color-danger: #f0877f;
    --color-danger-hover: #f6a8a2;
    --color-danger-soft: #3d2220;
    --color-warn: #e6c068;
    --color-warn-soft: #3a3016;
    --color-ok: #7fd49c;
    --color-ok-soft: #1d3626;
    --color-focus: #8fbcf5;
    --shadow-card: none;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-bottom: 5rem;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd,
fieldset {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.2em;
}

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

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

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -4rem;
  z-index: 10;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-3);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

/* ヘッダー */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
}

.site-header__brand {
  color: var(--color-text);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.site-header__brand:hover {
  color: var(--color-accent);
}

.site-header__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.site-header__email {
  min-width: 0;
  overflow: hidden;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-header form {
  margin: 0;
}

/* ページの枠 */
.page {
  display: grid;
  gap: var(--space-5);
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-7);
}

.page--narrow {
  max-width: calc(var(--content-width-narrow) + var(--space-4) * 2);
}

.page-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-4);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.page-lead {
  color: var(--color-text-muted);
  max-width: 40em;
}

.section-title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.4;
}

.back-link {
  font-size: var(--text-sm);
}

@media (max-width: 40rem) {
  .page {
    padding-top: var(--space-5);
  }

  .page-title {
    font-size: var(--text-xl);
  }

  .site-header__email {
    display: none;
  }
}

@media print {
  :root {
    color-scheme: light;
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-surface-sunken: #f1f1f1;
    --color-text: #000000;
    --color-text-muted: #444444;
    --color-border: #999999;
  }

  .site-header,
  .skip-link,
  .btn,
  .back-link {
    display: none;
  }

  .card {
    break-inside: avoid;
    box-shadow: none;
  }
}