:root {
  --bg: #fafafa;
  --card: #ffffff;
  --text: #0f0f10;
  --muted: #6b6b73;
  --border: #e7e7ea;
  --primary: #0f0f10;
  --primary-text: #ffffff;
  --ok: #16a34a;
  --maybe: #d97706;
  --ng: #dc2626;
  --highlight: #f1f5ff;
  --decided: #fef9c3;
  --line: #06c755;
  --font: "Inter", "Noto Sans JP", system-ui, -apple-system, "Hiragino Sans", sans-serif;
  --font-heading: var(--font);
  --radius: 10px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  --card-border: 1px solid var(--border);
  --hero-bg: transparent;
  --hero-text: var(--text);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f10;
    --card: #18181b;
    --text: #f4f4f5;
    --muted: #a1a1aa;
    --border: #2e2e33;
    --primary: #f4f4f5;
    --primary-text: #0f0f10;
    --ok: #4ade80;
    --maybe: #fbbf24;
    --ng: #f87171;
    --highlight: #1e2433;
    --decided: #3a3416;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
}

.site-header, main, .site-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header { padding-top: 16px; padding-bottom: 8px; }
.logo { font-weight: 700; color: var(--text); text-decoration: none; }
.site-footer { color: var(--muted); font-size: 12px; padding-top: 24px; padding-bottom: 32px; }

.card {
  background: var(--card);
  border: var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 12px 0;
}

h1, h2, .logo { font-family: var(--font-heading); }
h1 { font-size: 22px; margin: 0 0 8px; }
h2 { font-size: 17px; margin: 0 0 12px; }
.lead, .hint, .description { color: var(--muted); }
.description { white-space: pre-wrap; }
.hint { font-size: 13px; font-weight: normal; }

label { display: flex; flex-direction: column; gap: 4px; margin: 14px 0; font-weight: 600; }
.field-label { font-weight: 600; margin: 14px 0 6px; }

input, textarea, select {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  width: 100%;
  min-width: 0;
}

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.row input, .row select { flex: 1 1 140px; width: auto; }

.btn {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }
.btn.small { padding: 6px 12px; font-size: 14px; }
.btn.danger { color: var(--ng); }
.btn.line { background: var(--line); border-color: var(--line); color: #fff; font-weight: 600; margin-top: 4px; }
.btn:disabled { opacity: 0.6; cursor: default; }

button.link { background: none; border: 0; padding: 0; font: inherit; color: var(--primary); cursor: pointer; text-decoration: underline; }

.error { color: var(--ng); min-height: 1em; margin: 8px 0; }

.share { margin-top: 12px; }
.share-label { font-size: 13px; color: var(--muted); }

.decided { background: var(--decided); border-radius: var(--radius); padding: 16px 20px; margin: 12px 0; }
.decided-label { font-size: 13px; font-weight: 700; }
.decided-value { font-size: 20px; font-weight: 700; }
.decided-value a { font-size: 13px; font-weight: normal; }

.best ul { margin: 0; padding-left: 20px; }
.best .count { color: var(--muted); margin-left: 8px; font-size: 14px; }

.section-head { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }

.table-wrap { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { border-bottom: 1px solid var(--border); padding: 6px 8px; text-align: center; white-space: nowrap; }
th.cand, td.cand { text-align: left; }
td.cand { white-space: normal; min-width: 120px; }
th.sum, td.sum { color: var(--muted); width: 2.5em; }
tr.top-row td { background: var(--highlight); }
tr.decided-row td { background: var(--decided); font-weight: 700; }
td.mark { font-weight: 700; }
.m2 { color: var(--ok); }
.m1 { color: var(--maybe); }
.m0 { color: var(--ng); }
a.map { font-size: 12px; }
td.comment { white-space: normal; font-size: 12px; color: var(--muted); max-width: 10em; }

.pick-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.pick-buttons { display: flex; gap: 6px; flex-shrink: 0; }
.mark-btn {
  font: inherit;
  font-weight: 700;
  width: 44px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
  opacity: 0.45;
}
.mark-btn[aria-pressed="true"] { opacity: 1; border-width: 2px; border-color: currentColor; }

.admin { border-style: dashed; }
.decide { margin-top: 12px; }

/* --- トップ --- */
.hero { padding: 24px 0 8px; background: var(--hero-bg); color: var(--hero-text); }
.hero h1 { font-size: 26px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.tool-card { display: block; color: var(--text); text-decoration: none; margin: 0; }
.tool-card:hover { border-color: var(--primary); }
.tool-icon { width: 40px; height: 40px; border: 1px solid var(--border); border-radius: var(--radius-sm); display: grid; place-items: center; margin-bottom: 12px; }
.icon { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.hero h1 { font-size: 34px; letter-spacing: -0.03em; line-height: 1.2; }
.logo { letter-spacing: -0.02em; display: inline-flex; align-items: center; gap: 8px; }

/* --- 割り勘 --- */
.row .grow { flex: 2 1 120px; }
.row input.short, .row .short { flex: 0 1 96px; width: 96px; }
.unit-input { display: inline-flex; align-items: center; gap: 4px; }
.preview { background: var(--bg); border-radius: 10px; padding: 12px 14px; }
.per-person { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; margin: 8px 0; }
.per-person-item { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
.pp-name { font-size: 13px; color: var(--muted); }
.pp-amount { font-size: 20px; font-weight: 700; }
.memo { white-space: pre-wrap; }
.progress { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; margin: 8px 0 4px; }
.progress-bar { height: 100%; background: var(--ok); }
.pay-list { list-style: none; padding: 0; margin: 8px 0; }
.pay-list li { display: flex; align-items: center; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.pay-name { flex: 1; }
.pay-amount { font-weight: 700; }
.pay-list li.paid .pay-name, .pay-list li.paid .pay-amount { color: var(--muted); text-decoration: line-through; }
.pay-toggle[aria-pressed="true"] { background: var(--ok); border-color: var(--ok); color: #fff; }
.decided .btn { margin-top: 8px; }
.category-row, .member-row { display: grid; grid-template-columns: minmax(0, 1fr) 84px 92px 32px; gap: 6px; }
.category-row > *, .member-row > * { width: 100%; min-width: 0; }
.category-row select, .member-row select { padding: 8px 4px; }
.category-row .unit-input input { width: 100%; }
.category-row .btn.small, .member-row .btn.small { padding: 6px 0; }
.icon-wrap { display: inline-flex; }
a { color: var(--text); text-underline-offset: 2px; }
a.map { color: var(--muted); }

/* --- ページ構成(検索から入るページ) --- */
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.site-nav { display: flex; gap: 16px; font-size: 14px; }
.site-nav a, .footer-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover, .footer-nav a:hover { color: var(--text); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 8px; font-size: 13px; }
.breadcrumb { font-size: 13px; color: var(--muted); margin-top: 8px; }
.breadcrumb a { color: var(--muted); }
.hero .lead { margin: 0; }
.content { margin: 32px 0; }
.content h2 { font-size: 18px; margin-bottom: 8px; }
.content p, .content li { color: var(--text); }
.content ol { padding-left: 20px; }
.link-list { padding-left: 20px; }
.faq details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { color: var(--muted); margin: 8px 0 0; }