/* 45歳以上の方にも読みやすい、大きめの文字とやわらかい配色 */

:root {
  --color-bg: #faf7f0;
  --color-bg-alt: #eef3ee;
  --color-primary: #1f4e42;
  --color-primary-dark: #143830;
  --color-primary-bright: #2f8f6f;
  --color-primary-tint: #e1ede6;
  --color-accent: #c98a3a;
  --color-accent-tint: #f6ead9;
  --color-text: #2c2c2c;
  --color-text-soft: #4a4a4a;
  --color-border: #ddd6c5;
  --font-base: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.8;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background-color: var(--color-primary-dark);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.main-nav a {
  color: #f0ede3;
  text-decoration: none;
  font-size: 16px;
  padding: 6px 4px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus {
  border-bottom-color: var(--color-accent);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: 72px 0 0;
  overflow: hidden;
  position: relative;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: 24px;
  padding-bottom: 56px;
}

.hero-text {
  text-align: left;
}

.hero h1 {
  color: #fff;
  font-size: 36px;
  line-height: 1.5;
  margin: 0 0 20px;
}

.hero-sub {
  color: #e6e2d4;
  font-size: 19px;
  margin: 0 0 32px;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 380px;
  height: auto;
}

.hero-divider {
  display: block;
  width: 100%;
  height: 48px;
}

.hero-divider path {
  fill: var(--color-bg);
}

.cta-button {
  display: inline-block;
  background-color: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
  padding: 16px 36px;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.cta-button:hover,
.cta-button:focus {
  background-color: #b3782f;
  transform: translateY(-2px);
}

/* Ad slots */
.ad-slot {
  margin: 40px auto;
  text-align: center;
  min-height: 90px;
}

/* Content sections */
.content-section {
  padding: 64px 0;
}

.content-section.alt-bg {
  background-color: var(--color-bg-alt);
}

.content-section h2 {
  font-size: 28px;
  color: var(--color-primary-dark);
  text-align: center;
  margin: 0 0 40px;
  position: relative;
}

.content-section h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background-color: var(--color-accent);
  margin: 14px auto 0;
  border-radius: 2px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.card {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 28px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.card h3 {
  font-size: 20px;
  color: var(--color-primary);
  margin: 0 0 14px;
}

.card p {
  color: var(--color-text-soft);
  margin: 0;
  font-size: 17px;
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  background-color: var(--color-primary-tint);
  color: var(--color-primary);
}

.card-icon.accent {
  background-color: var(--color-accent-tint);
  color: var(--color-accent);
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.disclaimer-inline {
  margin-top: 32px;
  font-size: 14px;
  color: #7a7a7a;
  text-align: center;
  line-height: 1.7;
}

/* Strategy chart */
.chart-card {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px 28px 20px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  margin-bottom: 36px;
}

.chart-card h3 {
  font-size: 19px;
  color: var(--color-primary-dark);
  margin: 0 0 4px;
  text-align: center;
}

.chart-card .chart-sub {
  text-align: center;
  color: var(--color-text-soft);
  font-size: 15px;
  margin: 0 0 12px;
}

.chart-wrap {
  width: 100%;
  overflow: hidden;
}

.chart-wrap svg {
  width: 100%;
  height: auto;
  display: block;
}

.chart-grid-line {
  stroke: var(--color-border);
  stroke-width: 1;
}

.chart-axis-label {
  fill: #8a8577;
  font-size: 13px;
}

.chart-legend {
  display: flex;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  margin: 6px 0 4px;
  font-size: 14px;
  color: var(--color-text-soft);
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.chart-legend .swatch {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
}

.chart-caption {
  font-size: 13px;
  color: #8a8577;
  text-align: center;
  margin: 10px 0 0;
  line-height: 1.7;
}

/* FAQ */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-list details {
  background-color: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px 22px;
}

.faq-list summary {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary-dark);
  cursor: pointer;
}

.faq-list p {
  margin: 14px 0 0;
  color: var(--color-text-soft);
}

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: #cfc9b6;
  padding: 40px 0;
  font-size: 14px;
  text-align: center;
  line-height: 1.8;
}

.copyright {
  margin-top: 16px;
  color: #a9a290;
}

/* Responsive */
@media (max-width: 640px) {
  body {
    font-size: 17px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    padding-bottom: 40px;
  }

  .hero-text {
    text-align: center;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual svg {
    max-width: 240px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .main-nav {
    justify-content: center;
    width: 100%;
  }

  .content-section {
    padding: 48px 0;
  }

  .chart-card {
    padding: 24px 16px 16px;
  }
}