:root {
  --bg: #0d0c0a;
  --bg-elev: #161410;
  --bg-soft: #1e1a15;
  --bg-hover: #26211b;
  --fg: #f6f1e8;
  --fg-dim: #b8aea0;
  --fg-mute: #8a8074;
  --line: rgba(246, 241, 232, 0.1);
  --line-strong: rgba(246, 241, 232, 0.18);
  --accent: #e4572e;
  --accent-soft: rgba(228, 87, 46, 0.14);
  --copper: #d4a574;
  --teal: #7eb8b2;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --radius-sm: 12px;
  --header-h: 72px;
  --pad: clamp(1.25rem, 4vw, 3rem);
  --max: 1180px;
  --font-sans: "Outfit", "Zen Kaku Gothic New", sans-serif;
  --font-serif: "Instrument Serif", "Shippori Mincho", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="light"] {
  --bg: #f4efe6;
  --bg-elev: #fffdf8;
  --bg-soft: #ece5d8;
  --bg-hover: #e5dccb;
  --fg: #161310;
  --fg-dim: #4d463d;
  --fg-mute: #6f675c;
  --line: rgba(22, 19, 16, 0.1);
  --line-strong: rgba(22, 19, 16, 0.18);
  --accent: #c2410c;
  --accent-soft: rgba(194, 65, 12, 0.1);
  --copper: #9a6b3a;
  --teal: #0f766e;
  --shadow: 0 20px 50px rgba(22, 19, 16, 0.08);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;
}

html[lang="ja"] {
  --font-sans: "Zen Kaku Gothic New", "Outfit", sans-serif;
  --font-serif: "Shippori Mincho", "Instrument Serif", serif;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(228, 87, 46, 0.12), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(126, 184, 178, 0.08), transparent 50%),
    var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 80;
  background: var(--fg);
  color: var(--bg);
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
}

.skip:focus {
  top: 1rem;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--accent);
}

button,
input,
textarea,
select {
  font: inherit;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0;
}

p { margin: 0; }

.wrap {
  width: min(var(--max), calc(100% - var(--pad) * 2));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(var(--max), calc(100% - var(--pad) * 2));
  margin-inline: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  font-weight: 560;
  letter-spacing: -0.02em;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.brand small {
  display: block;
  color: var(--fg-mute);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav a {
  text-decoration: none;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  color: var(--fg-dim);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--fg);
  background: var(--bg-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.icon-btn,
.lang-btn,
.theme-btn,
.menu-btn {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--fg);
  width: 40px;
  height: 40px;
  border-radius: 999px;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.lang-btn {
  width: auto;
  padding: 0 0.85rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
}

.menu-btn { display: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.btn:hover { transform: translateY(-1px); color: inherit; }

.btn-primary {
  background: var(--fg);
  color: var(--bg);
}

.btn-primary:hover { background: var(--copper); color: #14110e; }

.btn-ghost {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--fg);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

main { position: relative; z-index: 1; }

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2.5rem, 7vw, 6rem) 0 3.5rem;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--copper);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 1.1rem;
}

.kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 6.4rem);
  max-width: 9ch;
}

.lede {
  margin-top: 1.3rem;
  max-width: 38rem;
  color: var(--fg-dim);
  font-size: 1.12rem;
}

.graph-panel {
  position: relative;
  min-height: 420px;
  border: 1px solid var(--line-strong);
  border-radius: 28px;
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bg-elev) 80%, transparent), var(--bg-soft));
  box-shadow: var(--shadow);
}

.graph-panel canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.graph-meta {
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.meta-chip {
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.7rem 0.8rem;
}

.meta-chip span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0.5rem 0 4rem;
}

.stat {
  padding: 1.2rem 1.3rem;
  border-right: 1px solid var(--line);
}

.stat:last-child { border-right: 0; }

.stat b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 400;
}

.stat span {
  color: var(--fg-mute);
  font-size: 0.88rem;
}

.section {
  padding: 1.5rem 0 4.5rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 1.6rem;
}

.section-head h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.section-head p,
.muted {
  color: var(--fg-dim);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.45rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.card {
  grid-column: span 4;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem 1.45rem;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--bg-hover);
}

.card.wide { grid-column: span 8; }
.card.full { grid-column: span 12; }

.card .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}

.card h3 {
  font-size: 1.7rem;
  margin: 0.7rem 0 0.6rem;
}

.card p { color: var(--fg-dim); flex: 1; }

.card .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  margin-top: 1.1rem;
  font-size: 0.92rem;
}

.now-grid,
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.quote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.35;
}

.quote footer {
  margin-top: 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--fg-mute);
}

.timeline {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--line-strong);
  margin-left: 0.4rem;
}

.tl-item {
  position: relative;
  padding: 0 0 1.5rem 1.4rem;
}

.tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.45rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
}

.tl-item time {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
}

.page-hero {
  padding: 3.5rem 0 1.5rem;
}

.page-hero h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
}

.page-hero .lede { max-width: 42rem; }

.certs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
}

.cert {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1rem;
  background: var(--bg-elev);
}

.cert b { display: block; }
.cert span { color: var(--fg-mute); font-size: 0.88rem; }

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  color: var(--fg-dim);
}

.form {
  display: grid;
  gap: 0.85rem;
}

.form label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
}

.form input,
.form textarea,
.form select {
  width: 100%;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--fg);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
}

.form textarea { min-height: 140px; resize: vertical; }

.form input:focus,
.form textarea:focus,
.form select:focus {
  outline: 2px solid var(--copper);
  outline-offset: 1px;
}

.contact-list {
  display: grid;
  gap: 0.8rem;
}

.contact-list a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.95rem 1rem;
  background: var(--bg-elev);
}

.contact-list a:hover {
  border-color: var(--copper);
  color: var(--fg);
}

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 2.4rem 0 2.8rem;
  color: var(--fg-dim);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 1.5rem;
}

.footer-grid h2 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin-bottom: 0.7rem;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.footer-grid a { text-decoration: none; }

.legal {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
}

.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(18px);
  padding: 1.2rem var(--pad) 2rem;
}

.mobile-nav.open { display: grid; gap: 0.4rem; align-content: start; }

.mobile-nav a {
  text-decoration: none;
  font-size: 1.4rem;
  font-family: var(--font-serif);
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

html[lang="en"] .ja { display: none; }
html[lang="ja"] .en { display: none; }

body.nav-open { overflow: hidden; }

@media (max-width: 980px) {
  .hero,
  .now-grid,
  .split,
  .footer-grid,
  .certs {
    grid-template-columns: 1fr;
  }

  .nav { display: none; }
  .menu-btn { display: grid; }
  .card, .card.wide { grid-column: span 12; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1),
  .stat:nth-child(2) { border-bottom: 1px solid var(--line); }
  .graph-panel { min-height: 340px; }
}

@media (max-width: 640px) {
  .brand span b { display: none; }
  .header-actions .btn { display: none; }
  .graph-meta { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}