:root {
  --ink: #183129;
  --muted: #627068;
  --line: #d7e2dc;
  --accent: #2f7d5b;
  --soft: #e8f3ed;
  --bg: #f6f8f6;
  --white: #fff;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  color: var(--ink);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  line-height: 1.75;
}
a {
  color: #226848;
}
.site-header, .site-footer {
  background: #fff;
  padding: 14px max(4vw, 16px);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-size: 1.35rem;
  font-weight: 900;
  text-decoration: none;
  color: var(--ink);
}
nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
main {
  width: min(1000px, calc(100% - 30px));
  margin: 30px auto 70px;
}
h1 {
  line-height: 1.3;
}
.lead, .muted, .checked {
  color: var(--muted);
}
.panel, .tool-card, .hero-result {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(17px, 4vw, 28px);
  margin: 20px 0;
  box-shadow: 0 8px 24px #1831290d;
}
.hero-result {
  border-top: 5px solid var(--accent);
}
.hero-result .result-label {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1.4;
}
.hero-result .money {
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 10px;
}
.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.chip, .tag {
  background: var(--soft);
  border-radius: 999px;
  padding: 4px 11px;
}
.slider-field {
  margin: 24px 0;
}
.slider-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.slider-head label {
  font-weight: 700;
}
.slider-value {
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 1.25rem;
  font-weight: 900;
  padding: 4px;
  cursor: pointer;
  border-bottom: 1px dotted currentColor;
  border-radius: 0;
}
.slider-value::after {
  content: " ✎";
  font-size: 0.75em;
  color: var(--muted);
}
.input-hint, .scenario-note, .slider-notice, .chart-legend {
  color: var(--muted);
  font-size: 0.85rem;
}
.slider-notice {
  display: block;
}
.chart-legend {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.reform-note {
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--soft);
  padding: 10px 14px;
  font-size: 0.9rem;
}
.reform-note ul {
  margin: 4px 0 0;
}
.month-field {
  display: block;
  font-weight: 700;
  margin: 14px 0;
}
.month-field input {
  display: block;
  width: 100%;
  height: 46px;
  margin-top: 6px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
}
.slider-field input[type="number"] {
  width: 9em;
  text-align: right;
  padding: 7px;
}
.slider-field input[type="range"] {
  width: 100%;
  height: 30px;
  appearance: none;
  background: linear-gradient(
    to right,
    var(--accent) var(--fill),
    #d7e2dc var(--fill)
  );
  height: 8px;
  border-radius: 9px;
}
.slider-field input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--accent);
  box-shadow: 0 2px 7px #0003;
}
.segments {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 14px 0;
}
.field-label {
  font-weight: 700;
  margin-top: 14px;
}
.segments label {
  position: relative;
}
.segments input {
  position: absolute;
  opacity: 0;
}
.segments span {
  display: block;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  font-weight: 700;
}
.segments input:checked + span {
  background: var(--accent);
  color: white;
}
.check {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 12px 0;
}
.check input {
  width: 20px;
  height: 20px;
}
.table-wrap {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}
table {
  border-collapse: collapse;
  width: 100%;
}
th, td {
  padding: 9px 7px;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}
select {
  display: block;
  width: 100%;
  height: 46px;
  margin-top: 6px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
}
th:first-child, td:first-child {
  text-align: left;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.tool-card {
  text-decoration: none;
  color: var(--ink);
  margin: 0;
}
.tool-card h3 {
  margin: 0;
}
.summary li {
  margin: 0.35em;
}
.related {
  display: block;
}
.related h2 {
  margin-top: 0;
}
.affiliate-slot, .ad-slot {
  min-height: 1px;
}
.explanation {
  font-size: 0.97rem;
}
.sources a {
  overflow-wrap: anywhere;
}

.howto {
  margin: 1rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--accent);
  background: #fff;
}

.howto ol {
  margin-bottom: 0;
}

.next-step {
  display: grid;
  gap: .25rem;
  margin: .75rem 0 1.5rem;
  padding: .9rem 1rem;
  border-radius: 10px;
  background: #eaf4ef;
}

.guide {
  max-width: 920px;
}

.guide-article {
  max-width: 760px;
  margin-inline: auto;
}

.guide-meta {
  color: var(--muted);
}

.guide-cta {
  display: grid;
  gap: .4rem;
  margin: 1.25rem 0;
}

.guide-body h2 {
  margin-top: 2.5rem;
}

.toc ol,
.top-guides ul {
  line-height: 1.9;
}

.guide-link a {
  display: inline-block;
  margin-top: .35rem;
}
.disclaimer {
  font-size: 0.83rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.site-footer {
  border-top: 1px solid var(--line);
  border-bottom: 0;
  align-items: center;
  font-size: 0.85rem;
}
.site-footer nav {
  gap: 12px;
}
.positive {
  color: #177245;
}
.negative {
  color: #b42318;
}
.chart {
  width: 100%;
  height: auto;
}
button, .button {
  border: 0;
  border-radius: 9px;
  padding: 10px 16px;
  background: var(--accent);
  color: white;
  font: inherit;
  font-weight: 700;
}
.secondary {
  background: #dfe9e3;
  color: var(--ink);
}
[hidden] {
  display: none !important;
}
@media (max-width: 767px) {
  main {
    margin-top: 18px;
  }
  .site-header {
    align-items: center;
  }
  .site-header nav {
    font-size: 0.82rem;
    gap: 10px;
  }
  .hero-result {
    position: relative;
  }
  .details {
    font-size: 0.82rem;
  }
  .hero-result .money {
    font-size: 2rem;
  }
  .site-footer {
    display: block;
  }
  .site-footer nav {
    margin-bottom: 10px;
  }
}