:root {
  --paper: #F7F6F3;
  --ink: #14202B;
  --signal: #2B6E68;
  --muted: #6B7680;
  --line: #D8D3C7;
  --tint: #EDF3F1;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'IBM Plex Sans', 'Noto Sans JP', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: 'Space Grotesk', 'Noto Sans JP', sans-serif;
  font-weight: 600;
  letter-spacing: -0.01em;
}

a { color: inherit; }

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 32px;
}

.mono {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---- signal line divider ---- */
.signal-divider {
  width: 100%;
  height: 32px;
  display: block;
}

/* ---- nav ---- */
nav {
  position: sticky;
  top: 0;
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}
nav .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
  gap: 16px;
}
nav .brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 17px;
  white-space: nowrap;
}
nav .links {
  display: flex;
  gap: 28px;
  list-style: none;
}
nav .links a {
  text-decoration: none;
  font-size: 14px;
  color: var(--muted);
  transition: color 0.15s ease;
}
nav .links a:hover { color: var(--ink); }
nav .right {
  display: flex;
  align-items: center;
  gap: 18px;
}
.lang-switch {
  display: flex;
  gap: 2px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.lang-switch a {
  display: block;
  background: transparent;
  border: none;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--muted);
  font-family: inherit;
  font-size: inherit;
  text-decoration: none;
}
.lang-switch a.active {
  background: var(--ink);
  color: var(--paper);
}
nav .cta {
  font-size: 14px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  border-radius: 4px;
  text-decoration: none;
  white-space: nowrap;
}

/* ---- hero ---- */
header.hero {
  padding: 96px 0 64px;
}
.eyebrow {
  color: var(--signal);
  text-transform: uppercase;
  margin-bottom: 20px;
  display: block;
}
h1.headline {
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.2;
  max-width: 760px;
  margin-bottom: 24px;
}
.lede {
  font-size: 18px;
  color: var(--muted);
  max-width: 580px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--signal);
  color: var(--paper);
  padding: 13px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  display: inline-block;
  transition: background 0.15s ease;
}
.btn-primary:hover { background: #235a55; }
.btn-secondary {
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

/* ---- hero photo ---- */
.hero-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
}
.hero-content {
  flex: 1;
  min-width: 0;
}
.hero-photo {
  flex-shrink: 0;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--paper);
  outline: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(20, 32, 43, 0.12);
}
@media (max-width: 720px) {
  .hero-grid { flex-direction: column-reverse; align-items: center; text-align: center; gap: 24px; }
  .hero-photo { width: 120px; height: 120px; }
  .hero-actions { justify-content: center; }
  .meta-strip { justify-content: center; text-align: left; }
}

/* ---- meta strip ---- */
.meta-strip {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 40px;
  margin-top: 40px;
  border-top: 1px solid var(--line);
}
.meta-item .k {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
  display: block;
}
.meta-item .v { font-size: 14px; }

/* ---- sections ---- */
section { padding: 64px 0; }
section.tinted { background: var(--tint); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 40px;
  gap: 24px;
  flex-wrap: wrap;
}
.section-head h2 { font-size: 28px; }
.section-head .desc {
  color: var(--muted);
  max-width: 360px;
  font-size: 15px;
}

/* ---- services grid ---- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service-card {
  background: var(--paper);
  padding: 32px;
}
.service-card .num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--signal);
  display: block;
  margin-bottom: 16px;
}
.service-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}
.service-card p {
  color: var(--muted);
  font-size: 14.5px;
}

/* ---- work / case studies ---- */
.case {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}
.case:last-child { border-bottom: none; }
.case .when {
  color: var(--muted);
  font-size: 13px;
  font-family: 'IBM Plex Mono', monospace;
}
.case .who {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}
.case h3 { font-size: 19px; margin-bottom: 10px; }
.case ul { list-style: none; }
.case li {
  font-size: 14.5px;
  color: var(--ink);
  padding-left: 18px;
  position: relative;
  margin-bottom: 6px;
}
.case li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--signal);
}
.case .tags {
  margin-top: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--signal);
  background: var(--tint);
  padding: 4px 10px;
  border-radius: 3px;
}

/* ---- portfolio ---- */
.portfolio-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px 32px;
  background: var(--paper);
}
.portfolio-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal);
  flex-shrink: 0;
}
.portfolio-card h3 {
  font-size: 19px;
  margin-bottom: 6px;
}
.portfolio-card p {
  color: var(--muted);
  font-size: 14.5px;
}
.portfolio-link {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13.5px;
  color: var(--signal);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 10px 18px;
  border-radius: 4px;
  white-space: nowrap;
  transition: border-color 0.15s ease;
}
.portfolio-link:hover { border-color: var(--signal); }
@media (max-width: 640px) {
  .portfolio-card { grid-template-columns: auto 1fr; }
  .portfolio-link { grid-column: 1 / -1; text-align: center; margin-top: 12px; }
}

/* ---- stack ---- */
.stack-groups {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.stack-group .k {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
  display: block;
}
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pill {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px;
  border: 1px solid var(--line);
  padding: 6px 11px;
  border-radius: 3px;
}

/* ---- about ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-grid p { color: var(--muted); margin-bottom: 16px; font-size: 15.5px; }
.lang-list { list-style: none; }
.lang-list li {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}
.lang-list li:last-child { border-bottom: none; }
.lang-list .level { color: var(--signal); font-family: 'IBM Plex Mono', monospace; font-size: 12.5px; }

/* ---- contact ---- */
footer.contact {
  padding: 72px 0 56px;
  text-align: center;
}
footer.contact h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  max-width: 560px;
  margin: 0 auto 20px;
}
footer.contact p.sub {
  color: var(--muted);
  margin-bottom: 32px;
}
.contact-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.contact-links a {
  text-decoration: none;
  font-size: 15px;
  font-family: 'IBM Plex Mono', monospace;
  border: 1px solid var(--line);
  padding: 10px 18px;
  border-radius: 4px;
}
.contact-links a:hover { border-color: var(--signal); color: var(--signal); }
.footnote {
  color: var(--muted);
  font-size: 12.5px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

@media (max-width: 720px) {
  .services-grid { grid-template-columns: 1fr; }
  .case { grid-template-columns: 1fr; gap: 8px; }
  .stack-groups { grid-template-columns: 1fr; gap: 24px; }
  .about-grid { grid-template-columns: 1fr; }
  nav .links { display: none; }
}