:root {
  --accent: #2d5a8b;
  --accent-dark: #1f4466;
  --accent-light: #eef4fa;
  --bg: #f6f8fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", Meiryo, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 1.25rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Header / Nav ---------- */
.site-header {
  background: var(--accent);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,.12);
}
.site-header .inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: .75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.brand {
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 28px; height: 28px;
  border-radius: 6px;
  background: #fff;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 800;
}
.nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.nav a {
  color: #e5eef7;
  padding: .35rem .6rem;
  border-radius: 6px;
  font-size: 1.1rem;
}
.nav a:hover { background: rgba(255,255,255,.15); color: #fff; text-decoration: none; }
.nav a.active { background: rgba(255,255,255,.22); color: #fff; font-weight: 700; }

/* ---------- Layout ---------- */
.wrap { max-width: 1100px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }

/* ---------- Hero (LP) ---------- */
.hero {
  text-align: center;
  padding: 3.5rem 1.25rem 2.5rem;
  background: linear-gradient(160deg, var(--accent-dark), var(--accent));
  color: #fff;
}
.hero h1 { font-size: 2.75rem; margin: 0 0 .75rem; }
.hero p { font-size: 1.25rem; margin: 0 auto 1.5rem; max-width: 640px; color: #dbe7f3; }
.hero .cta {
  display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: .65rem 1.4rem;
  border-radius: 8px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  font-size: 1.15rem;
}
.btn-primary { background: #fff; color: var(--accent-dark); }
.btn-primary:hover { background: #eef4fa; text-decoration: none; }
.btn-outline { background: transparent; color: #fff; border: 2px solid #fff; }
.btn-outline:hover { background: rgba(255,255,255,.12); text-decoration: none; }

/* ---------- Section ---------- */
.section { padding: 2.5rem 0 1rem; }
.section h2 {
  font-size: 1.9rem;
  text-align: center;
  margin: 0 0 .5rem;
}
.section .sub { text-align: center; color: var(--muted); margin: 0 0 1.5rem; }

/* ---------- Feature cards ---------- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,.05);
}
.card .icon { font-size: 1.6rem; }
.card h3 { margin: .5rem 0 .35rem; font-size: 1.3rem; }
.card p { margin: 0; font-size: 1.1rem; color: var(--muted); }

/* ---------- Comparison table ---------- */
.table-wrap { overflow-x: auto; }
table.compare {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,.05);
  font-size: 1.1rem;
}
.compare th, .compare td { border: 1px solid var(--border); padding: .7rem .8rem; text-align: left; vertical-align: top; }
.compare thead th { background: var(--accent); color: #fff; font-weight: 700; white-space: nowrap; }
.compare td.rowhead { font-weight: 700; white-space: nowrap; color: var(--accent-dark); background: var(--accent-light); }
.compare tbody tr:nth-child(even) td { background: #fbfcfe; }

.license-badge {
  display: inline-block;
  padding: .15rem .55rem;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: var(--accent-light);
  border: 1px solid var(--accent);
}

/* ---------- QA page ---------- */
.toolbar { display: flex; gap: .6rem; margin-bottom: 1rem; flex-wrap: wrap; align-items: center; }
#search {
  flex: 1 1 320px;
  padding: .7rem 1rem;
  font-size: 1.2rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  min-width: 0;
}
#search:focus { outline: none; border-color: var(--accent); }
select#catFilter {
  padding: .7rem .8rem;
  font-size: 1.15rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #fff;
}
.panels { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 820px) { .panels { grid-template-columns: 1fr; } }
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem;
  min-height: 320px;
}
.panel h2 { font-size: 1.35rem; margin: 0 0 .8rem; padding-bottom: .5rem; border-bottom: 1px solid var(--border); }

#results { list-style: none; margin: 0; padding: 0; }
#results li {
  margin-bottom: 1.1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px dashed var(--border);
}
#results li:last-child { border-bottom: none; }
#results .q { font-weight: 700; color: var(--accent-dark); }
#results .a { color: var(--text); }
#results .meta { margin-top: .3rem; font-size: .95rem; color: var(--muted); }
.empty { color: var(--muted); text-align: center; padding: 2rem 0; }

/* Mermaid */
#flowchart { overflow-x: auto; }
#flowchart .mermaid { font-size: .9rem; }

/* ---------- Licenses page ---------- */
.license-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 820px) { .license-grid { grid-template-columns: 1fr; } }
.license-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.25rem; box-shadow: 0 1px 3px rgba(0,0,0,.05); }
.license-card h2 { margin: 0 0 .5rem; display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; font-size: 1.45rem; }
.license-card .spdx { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .95rem; color: var(--muted); }
.license-card .summary { color: var(--muted); font-size: 1.1rem; margin: 0 0 .9rem; }
.license-card h3 { font-size: 1.05rem; margin: 1rem 0 .4rem; color: var(--accent-dark); text-transform: uppercase; letter-spacing: .03em; }
.license-card ul { margin: 0; padding-left: 1.1rem; font-size: 1.1rem; }
.license-card li { margin-bottom: .35rem; }
.license-card .term strong { display: inline-block; min-width: 7.5em; }
.license-card .sources { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 1.25rem 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
  background: var(--card);
}
.site-footer a { margin: 0 .35rem; }

/* ---------- Q&A: モードタブ ---------- */
.mode-tabs { display: flex; gap: .5rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.mode-tabs button {
  padding: .6rem 1.3rem;
  border-radius: 8px;
  border: 2px solid var(--border);
  background: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--muted);
}
.mode-tabs button.active { border-color: var(--accent); background: var(--accent); color: #fff; }

/* ---------- Q&A: カテゴリタブ ---------- */
.cat-tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .75rem; }
.cat-tabs button {
  padding: .35rem .8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 1rem;
  cursor: pointer;
  color: var(--muted);
}
.cat-tabs button.active { background: var(--accent-light); border-color: var(--accent); color: var(--accent-dark); font-weight: 700; }

/* ---------- Q&A: 結果情報 ---------- */
.result-info { margin-bottom: .5rem; font-size: 1rem; color: var(--muted); }

/* ---------- Q&A: アコーディオン ---------- */
.acc { border: 1px solid var(--border); border-radius: 8px; background: var(--card); margin-bottom: .5rem; overflow: hidden; }
.acc .acc-q {
  padding: .8rem 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}
.acc .acc-q:hover { background: var(--accent-light); }
.acc .acc-toggle { color: var(--muted); flex-shrink: 0; }
.acc .acc-a { padding: .6rem 1rem 1rem; border-top: 1px dashed var(--border); display: none; }
.acc.open .acc-a { display: block; }
.acc .acc-a .meta { margin-top: .5rem; }

/* ---------- Q&A: ベストアンサー ---------- */
.best-answer { border: 2px solid var(--accent); background: var(--accent-light); border-radius: 10px; padding: 1rem 1.2rem; margin-bottom: 1rem; }
.best-answer .label { font-size: .95rem; font-weight: 800; color: var(--accent-dark); letter-spacing: .05em; margin-bottom: .3rem; }
.best-answer .q { font-weight: 700; color: var(--accent-dark); }
.best-answer .meta { margin-top: .4rem; }

/* ---------- Q&A: キーワードハイライト ---------- */
mark { background: #ffe58f; padding: 0 .15em; border-radius: 3px; }

/* ---------- Q&A: 決定ガイド（ウィザード） ---------- */
.wizard { max-width: 760px; margin: 0 auto; }
.wprogress { display: flex; gap: .4rem; justify-content: center; margin-bottom: 1rem; }
.wprogress .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--border); transition: transform .15s; }
.wprogress .dot.done { background: var(--accent); }
.wprogress .dot.cur { background: var(--accent); transform: scale(1.35); }

.wstep { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.75rem 1.5rem; text-align: center; }
.wstep h3 { margin: 0 0 .5rem; font-size: 1.15rem; color: var(--muted); }
.wstep .help { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.25rem; }
.wstep .wq { font-size: 1.5rem; font-weight: 700; margin: 0 0 1.4rem; }
.wstep .btn-group { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }
.btn-yes { background: var(--accent); color: #fff; }
.btn-yes:hover { background: var(--accent-dark); text-decoration: none; }
.btn-no { background: #fff; color: var(--text); border: 2px solid var(--border); }
.btn-no:hover { border-color: var(--accent); color: var(--accent-dark); text-decoration: none; }
.wnav { margin-top: 1.25rem; }
.btn-back, .btn-restart { background: #fff; color: var(--muted); border: 2px solid var(--border); font-size: 1.05rem; }

/* ---------- Q&A: 判定結果 ---------- */
.wresult { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.75rem 1.5rem; }
.wresult h3 { margin: 0 0 1rem; }
.wresult .rec-label { font-size: .95rem; color: var(--muted); margin: 0; letter-spacing: .05em; }
.wresult .rec { font-size: 1.8rem; font-weight: 800; color: var(--accent-dark); margin: .1rem 0 .4rem; }
.wresult .summary { color: var(--muted); margin: 0 0 1rem; }
.wresult h4 { font-size: 1.1rem; margin: 1.25rem 0 .5rem; color: var(--accent-dark); }
.wresult ul { margin: 0; padding-left: 1.2rem; }
.wresult li { margin-bottom: .35rem; }
.flow-result { margin-top: 1.5rem; overflow-x: auto; }
.flow-result .mermaid { font-size: .9rem; }