/* ---------- Design tokens ---------- */
:root {
  --color-bg: #f7f4ef;
  --color-bg-alt: #f1ede5;
  --color-ink: #262320;
  --color-ink-soft: #58524a;
  --color-line: #d8d1c4;
  --color-accent: #8a6d4f;
  --color-active: #6b7a5e;
  --color-prep: #a8987e;

  --font-jp: "Shippori Mincho", serif;
  --font-en: "Cormorant Garamond", serif;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 140px;

  --max-width: 880px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-jp);
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.02em;
}

a {
  color: inherit;
  text-decoration: none;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.eyebrow {
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 500;
  margin-bottom: var(--space-4);
  letter-spacing: 0.05em;
}

.body-text {
  color: var(--color-ink-soft);
  font-size: 16px;
  max-width: 640px;
  margin-top: var(--space-2);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  z-index: 10;
  mix-blend-mode: difference;
}

.site-header .mark {
  display: block;
  color: #f7f4ef;
  line-height: 0;
}

.site-header .mark-icon {
  width: auto;
  height: 52px;
  display: block;
}

.site-header nav {
  display: flex;
  gap: var(--space-4);
}

.site-header nav a {
  font-family: var(--font-en);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: #f7f4ef;
  opacity: 0.85;
  transition: opacity 0.25s ease;
}

.site-header nav a:hover {
  opacity: 1;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-5) var(--space-3);
  position: relative;
}

.hero-kicker {
  font-family: var(--font-en);
  font-size: 15px;
  letter-spacing: 0.5em;
  color: var(--color-accent);
  margin-bottom: var(--space-5);
}

.hero-copy {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.5;
  max-width: 900px;
  color: var(--color-ink);
  letter-spacing: 0.01em;
}

.hero-rule {
  width: 1px;
  height: 64px;
  background: var(--color-line);
  margin: var(--space-5) 0 var(--space-3);
}

.hero-sub {
  font-family: var(--font-jp);
  font-size: 15px;
  letter-spacing: 0.4em;
  color: var(--color-ink-soft);
}

/* ---------- Philosophy ---------- */
.philosophy {
  padding: var(--space-7) 0;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.lead-jp {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: var(--space-2);
  color: var(--color-ink);
}

.lead-sub {
  font-family: var(--font-jp);
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.vision {
  margin-top: var(--space-4);
}

/* ---------- Business ---------- */
.business {
  padding: var(--space-6) 0;
}

.business-lead {
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 500;
  line-height: 1.85;
  max-width: 680px;
  color: var(--color-ink);
  margin-bottom: var(--space-5);
}

.business-subtitle {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  opacity: 0.7;
  margin-bottom: var(--space-3);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.business-item {
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-3);
}

.business-num {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--color-ink-soft);
  opacity: 0.7;
}

.business-item h3 {
  font-size: 16px;
  font-weight: 500;
  margin: var(--space-2) 0 var(--space-2);
  letter-spacing: 0.03em;
  color: var(--color-ink-soft);
}

.business-item p {
  font-size: 14px;
  color: var(--color-ink-soft);
  opacity: 0.85;
  line-height: 1.85;
}

/* ---------- Portfolio ---------- */
.portfolio {
  padding: var(--space-7) 0;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.portfolio-title {
  font-size: clamp(26px, 3.6vw, 36px);
}

.portfolio-lead {
  font-size: 17px;
  max-width: 560px;
  margin-bottom: var(--space-5);
}

.portfolio-list {
  list-style: none;
}

.portfolio-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-line);
}

.portfolio-item:last-child {
  border-bottom: 1px solid var(--color-line);
}

.portfolio-status {
  flex: 0 0 108px;
  font-family: var(--font-en);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 6px;
  text-align: center;
  border: 1px solid currentColor;
}

.status-active {
  color: var(--color-active);
}

.status-pilot {
  color: var(--color-ink-soft);
  border-style: dashed;
  opacity: 0.85;
}

.status-prep {
  color: var(--color-prep);
}

.portfolio-body h3 {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.portfolio-body h3 a {
  color: inherit;
  border-bottom: 1px solid var(--color-line);
  transition: border-color 0.25s ease, opacity 0.25s ease;
}

.portfolio-body h3 a:hover {
  border-color: currentColor;
  opacity: 0.7;
}

.portfolio-body p {
  color: var(--color-ink-soft);
  font-size: 14.5px;
  margin-top: 6px;
}

.portfolio-note {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-top: 8px;
  font-style: italic;
}

/* ---------- Founder ---------- */
.founder {
  padding: var(--space-7) 0;
}

.founder-inner {
  text-align: center;
}

.founder-name {
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
}

.founder-title {
  font-family: var(--font-en);
  font-size: 15px;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.founder .body-text {
  margin: 0 auto;
}

/* ---------- Contact ---------- */
.contact {
  padding: var(--space-7) 0 var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-line);
}

.contact .section-title {
  margin-bottom: var(--space-2);
}

.contact .body-text {
  margin: 0 auto var(--space-4);
}

.contact-link {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 20px;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-ink);
  padding-bottom: 4px;
  transition: opacity 0.25s ease;
}

.contact-link:hover {
  opacity: 0.6;
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: var(--space-5) var(--space-3) var(--space-4);
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
}

.footer-mark {
  width: min(260px, 70%);
  height: auto;
  display: block;
  margin: 0 auto var(--space-4);
  color: var(--color-ink);
}

/* ---------- Responsive ---------- */
.mobile-only {
  display: none;
}

@media (max-width: 720px) {
  .site-header {
    padding: var(--space-2);
  }

  .site-header nav {
    gap: var(--space-2);
  }

  .site-header nav a {
    font-size: 11px;
    letter-spacing: 0.06em;
  }

  .business-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .portfolio-item {
    flex-direction: column;
    gap: var(--space-2);
  }

  .portfolio-status {
    flex: none;
    display: inline-block;
    padding: 3px 10px;
  }

  .mobile-only {
    display: inline;
  }

  section {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }
}