/* ---------- tokens ---------- */
:root {
  --bg: #0b0d12;
  --bg-alt: #11141c;
  --surface: #161a24;
  --border: #232834;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --accent: #7c8cff;
  --accent-soft: rgba(124, 140, 255, 0.14);
  --accent-strong: #a5b1ff;
  --danger: #ff6b6b;
  --radius: 12px;
  --radius-lg: 18px;
  --max: 1080px;
  --font-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  --font-en: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-en), var(--font-ja);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html[lang="ja"] body { font-family: var(--font-ja); }

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

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

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 13, 18, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}
.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.wordmark:hover { text-decoration: none; color: var(--text); }
.wordmark-text { font-size: 18px; }
.wordmark-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  transform: translateY(-2px);
}
.wordmark-tag {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  font-weight: 500;
}

.site-nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}
.site-nav a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); text-decoration: none; }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  background: transparent;
  color: var(--text-muted);
  border: 0;
  padding: 6px 12px;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] {
  background: var(--accent);
  color: #0b0d12;
}
.lang-switch button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- sections ---------- */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border);
}
.section-alt { background: var(--bg-alt); }
.section-head { margin-bottom: 48px; max-width: 640px; }
.section-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.2;
  margin: 4px 0 12px;
  letter-spacing: -0.01em;
}
.section-lede { color: var(--text-muted); margin: 0; }
.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  margin: 0 0 12px;
}

/* ---------- hero ---------- */
.hero {
  padding: 128px 0 96px;
  background:
    radial-gradient(1000px 600px at 80% -10%, rgba(124, 140, 255, 0.18), transparent 60%),
    radial-gradient(700px 500px at 10% 30%, rgba(124, 140, 255, 0.08), transparent 60%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 820px; }
.hero-title {
  font-size: clamp(34px, 5.2vw, 60px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 8px 0 24px;
}
.hero-lede {
  font-size: clamp(16px, 1.4vw, 19px);
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 0 32px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- lead quote ---------- */
.lead-quote { padding: 64px 0; background: var(--bg-alt); }
.lead-quote blockquote {
  margin: 0 0 16px;
  border-left: 3px solid var(--accent);
  padding: 8px 0 8px 20px;
}
.lead-quote blockquote p {
  margin: 0;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  color: var(--text);
}
.quote-body { margin: 0; color: var(--text-muted); max-width: 720px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #0b0d12;
}
.btn-primary:hover { background: var(--accent-strong); color: #0b0d12; }
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-strong); }

/* ---------- cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  position: relative;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-index {
  position: absolute;
  top: 20px;
  right: 22px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 8px;
  border-radius: 999px;
}
.card h3 {
  margin: 8px 0 10px;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.card p { margin: 0; color: var(--text-muted); font-size: 15px; }

/* ---------- stack ---------- */
.stack-grid {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--border);
}
.stack-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.stack-row dt {
  color: var(--text);
  font-weight: 600;
}
.stack-row dd {
  margin: 0;
  color: var(--text-muted);
}

/* ---------- about ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin: 0;
}
.about-grid > div {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.about-grid dt {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.about-grid dd {
  margin: 0;
  color: var(--text);
  font-weight: 500;
}

/* ---------- contact ---------- */
.contact-inner { max-width: 720px; }
.contact-form {
  display: grid;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.field { display: grid; gap: 6px; }
.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}
.field input,
.field textarea {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.contact-form .btn { justify-self: start; }
.form-note { margin: 0; color: var(--text-muted); font-size: 13px; }
.honeypot {
  position: absolute !important;
  left: -10000px; top: auto;
  width: 1px; height: 1px; overflow: hidden;
}

/* ---------- footer ---------- */
.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-muted);
  font-size: 13px;
}
.footer-inner p { margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .site-nav { display: none; }
  .section { padding: 72px 0; }
  .hero { padding: 96px 0 72px; }
  .stack-row { grid-template-columns: 1fr; gap: 4px; }
  .header-inner { gap: 12px; }
}

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