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

:root {
  --color-bg: #f9f7f2;
  --color-text: #2d2d2d;
  --color-muted: #6b6b6b;
  --color-accent: #4a7c59;
  --color-accent-light: #d6e8da;
  --color-border: #e0ddd5;
  --font-main: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', Georgia, serif;
  --font-ui: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', system-ui, sans-serif;
  --content-width: 680px;
  --section-gap: 5rem;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

/* ─── Layout ─── */

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--wide {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Header / Nav ─── */

.site-header {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-logo {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

.site-nav a {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-left: 2rem;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* ─── Hero ─── */

.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: stretch;
  overflow: hidden;
}

.hero__image-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left bottom;
  display: block;
}

.hero__overlay {
  display: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-left: auto;
  width: 50%;
  padding: 4rem 3.5rem 4rem 3rem;
  background-color: rgba(249, 247, 242, 0.78);
}

.hero__eyebrow {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.hero__heading {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.hero__lead {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
  max-width: 36ch;
}

.hero__sub {
  font-size: 0.9rem;
  color: var(--color-muted);
  max-width: 38ch;
  margin-bottom: 2.5rem;
  line-height: 1.9;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ─── Buttons ─── */

.btn {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  padding: 0.65rem 1.5rem;
  border-radius: 2px;
  letter-spacing: 0.03em;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.75;
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  background: transparent;
}

/* ─── Sections ─── */

.section {
  padding: var(--section-gap) 0;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section__label {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.section__heading {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.section__body {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.section__body p + p {
  margin-top: 1em;
}

/* ─── Cards (5要素) ─── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 1.5rem 1.25rem;
}

.card__title {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.card__body {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ─── Lead text block (やわらかい語り) ─── */

.lead-text {
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 2;
}

.lead-text p {
  margin: 0 0 0.6em;
}

.lead-text p:last-child {
  margin-bottom: 0;
}

.lead-text .accent {
  color: var(--color-text);
}

.lead-text .gap {
  display: block;
  height: 0.8em;
}

/* ─── Steps (手順) ─── */

.steps {
  margin: 2.5rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 0 0 1.5rem 3rem;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.steps li:last-child {
  padding-bottom: 0;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.9rem;
  height: 1.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: #fff;
  background: var(--color-accent);
  border-radius: 50%;
}

.steps li:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 0.95rem;
  top: 2.2rem;
  bottom: 0.3rem;
  width: 1px;
  background: var(--color-accent-light);
}

.note {
  margin-top: 1.75rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ─── Philosophy page ─── */

.philosophy-intro {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.philosophy-intro__heading {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.philosophy-intro__lead {
  font-size: 0.95rem;
  color: var(--color-muted);
}

.philosophy-intro__lead p + p {
  margin-top: 0.85em;
}

.phil-section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.phil-section:last-of-type {
  border-bottom: none;
}

.phil-section__heading {
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.phil-section__body {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.9;
}

.phil-section__body p + p {
  margin-top: 0.85em;
}

/* ─── Back link ─── */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-ui);
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

.back-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.back-link::before {
  content: '←';
}

/* ─── Footer ─── */

.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--section-gap);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-footer__copy {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.site-footer__nav a {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-left: 1.5rem;
}

/* ─── Responsive ─── */

@media (max-width: 700px) {
  .hero {
    min-height: 0;
    flex-direction: column;
  }

  .hero__image-wrap {
    position: relative;
    height: 62vw;
    flex-shrink: 0;
  }

  .hero__content {
    width: 100%;
    margin-left: 0;
    padding: 2.5rem 1.5rem 3rem;
    background-color: var(--color-bg);
  }

  .cards {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__nav a:first-child {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 16px;
  }

  .cards {
    grid-template-columns: 1fr;
  }
}