:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --ink: #1e2530;
  --ink-soft: #5b6472;
  --line: #e4e2dc;
  --accent: #0f766e;
  --accent-dark: #0b5d57;
  --accent-soft: #e6f2f1;
  --warn: #b45309;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(30, 37, 48, 0.06), 0 8px 24px rgba(30, 37, 48, 0.07);
}

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

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* ---- header ---- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.brand .dot { color: var(--accent); }
.site-nav { display: flex; gap: 20px; align-items: center; }
.site-nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; }
.site-nav a:hover { color: var(--accent); }

/* ---- buttons ---- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background 0.15s, transform 0.1s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-ghost:hover { background: var(--accent-soft); }
.btn-small { padding: 8px 18px; font-size: 0.88rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---- sections ---- */
.section { padding: 72px 0; }
.section-title { font-size: 1.7rem; text-align: center; margin-bottom: 8px; }
.section-lead { text-align: center; color: var(--ink-soft); margin-bottom: 44px; }

/* ---- cards ---- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 760px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
}

/* ---- forms ---- */
label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
input[type="text"], input[type="email"], input[type="number"], input[type="date"],
select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}
.field { margin-bottom: 16px; }
.field-row { display: flex; gap: 12px; }
.field-row > * { flex: 1; }

/* ---- tool page layout ---- */
.tool-header { padding: 40px 0 8px; }
.tool-header h1 { font-size: 1.5rem; }
.tool-header p { color: var(--ink-soft); }
.privacy-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.82rem;
  padding: 4px 12px;
  border-radius: 999px;
  margin-top: 10px;
}
.tool-body { padding: 24px 0 72px; }

/* ---- misc ---- */
.muted { color: var(--ink-soft); font-size: 0.88rem; }
.badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
}
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
  background: var(--surface);
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.site-footer a { color: var(--ink-soft); }
.site-footer a:hover { color: var(--accent); }