/* ============================================================
   benri-apptools  — 共通スタイル（ライトテーマ基調）
   ============================================================ */

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

:root {
  --bg:      #f5f6f8;
  --white:   #ffffff;
  --surface: #ffffff;
  --border:  #e4e6eb;
  --border2: #d0d3db;
  --green:   #28a85f;
  --green-l: #3ddc84;
  --green-bg:#f0faf4;
  --text:    #111318;
  --muted:   #6b7280;
  --muted2:  #9ca3af;
  --mono: "JetBrains Mono", "Courier New", monospace;
  --sans: "Inter", "Noto Sans JP", sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── サイトヘッダー ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 52px;
}

.site-logo {
  font-family: var(--mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.site-logo:hover { opacity: 0.75; }

/* パンくず（サブページ用） */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.site-nav-sep {
  color: var(--border2);
  font-size: 1rem;
}

.site-nav-current {
  font-size: 0.83rem;
  color: var(--muted);
}

.site-back {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.site-back:hover { color: var(--text); }

/* ── サイトフッター ── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--white);
  padding: 2.5rem 2rem;
}

.footer-inner {
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.footer-site {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--green);
}

.footer-copy {
  font-size: 0.73rem;
  color: var(--muted2);
}

.footer-back {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-back:hover { color: var(--text); }

/* ── セクション共通 ── */
.section-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted2);
  margin-bottom: 2.5rem;
}

@media (max-width: 640px) {
  .site-header { padding: 0 1.2rem; }
  .section-inner { padding: 3rem 1.2rem; }
  .site-footer { padding: 2rem 1.2rem; }
}