/* strassen.ai — shared design system ("operating room, not AI magic").
   Dark navy base, white typography, status accents used only with meaning:
   cyan = identity/route, lime = verified/complete, amber = policy/deployment,
   violet = context/research, red = liveness/risk. */

:root {
  --bg: #071019;
  --bg-2: #0a131e;
  --panel: rgba(15, 27, 40, .82);
  --panel-solid: #0f1b28;
  --ink: #f5f8fb;
  --ink-2: #c5cfda;
  --muted: #9eabb9;
  --dim: #7f8c9b;
  --line: rgba(156, 180, 204, .18);
  --line-strong: rgba(156, 180, 204, .34);
  --cyan: #4adeff;
  --lime: #9cff43;
  --amber: #ffbd45;
  --violet: #8b6cff;
  --red: #ff5158;
  --radius: 20px;
  --max: 1240px;
  --header-h: 72px;
  --sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Monaco, Consolas, monospace;
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 78% 6%, rgba(74, 222, 255, .09), transparent 27rem),
    radial-gradient(circle at 12% 38%, rgba(139, 108, 255, .08), transparent 30rem),
    linear-gradient(180deg, #071019 0%, #08111b 47%, #071019 100%);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .14;
  background-image:
    linear-gradient(rgba(255, 255, 255, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .025) 1px, transparent 1px);
  background-size: 42px 42px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 75%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 75%);
  z-index: -1;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--ink); }
button { font: inherit; cursor: pointer; }
img, svg { max-width: 100%; display: block; }
h1, h2, h3, h4, p { margin: 0; overflow-wrap: anywhere; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  padding: 10px 14px; border-radius: 10px; background: var(--lime); color: #071019; font-weight: 700;
}
.skip-link:focus { top: 12px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.shell { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.section { padding: 112px 0; position: relative; }
.section-tight { padding: 80px 0; }
.eyebrow {
  display: inline-flex; gap: 10px; align-items: center; margin: 0 0 18px;
  font-family: var(--mono); font-size: 12px; font-weight: 700; letter-spacing: .17em; text-transform: uppercase; color: var(--cyan);
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }
.eyebrow.lime { color: var(--lime); }
.eyebrow.amber { color: var(--amber); }
.eyebrow.violet { color: var(--violet); }
.eyebrow.red { color: var(--red); }
.headline { font-size: clamp(34px, 4.8vw, 66px); line-height: 1.12; letter-spacing: -.04em; font-weight: 900; }
.headline .nowrap { white-space: nowrap; }
.section-title { max-width: 900px; font-size: clamp(32px, 4.4vw, 60px); line-height: 1.14; letter-spacing: -.035em; font-weight: 800; }
.section-title.wide { max-width: 1120px; }
.lead { margin: 24px 0 0; max-width: 760px; color: var(--ink-2); font-size: clamp(16px, 1.5vw, 20px); line-height: 1.9; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }
.button-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.button {
  display: inline-flex; min-height: 50px; padding: 0 22px; align-items: center; justify-content: center; gap: 8px;
  border: 1px solid var(--line-strong); border-radius: 999px; background: rgba(255, 255, 255, .02);
  color: var(--ink); font-weight: 700; line-height: 1.3; text-align: center;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); border-color: var(--cyan); background: rgba(74, 222, 255, .06); color: var(--ink); }
.button.primary { background: var(--lime); border-color: var(--lime); color: #071019; }
.button.primary:hover { background: #afff6c; color: #071019; }
.button.small { min-height: 44px; padding-inline: 17px; font-size: 14px; }
.button[disabled] { opacity: .6; cursor: progress; transform: none; }
.tag {
  display: inline-flex; align-items: center; min-height: 30px; border: 1px solid var(--line-strong); border-radius: 999px; padding: 0 11px;
  color: var(--muted); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap;
}
.tag.lime { color: var(--lime); border-color: rgba(156, 255, 67, .45); }
.tag.cyan { color: var(--cyan); border-color: rgba(74, 222, 255, .45); }
.tag.amber { color: var(--amber); border-color: rgba(255, 189, 69, .45); }
.tag.violet { color: var(--violet); border-color: rgba(139, 108, 255, .45); }
.tag.red { color: var(--red); border-color: rgba(255, 81, 88, .45); }

/* Announcement + header */
.announcement {
  position: relative; z-index: 12; min-height: 38px; display: grid; place-items: center; padding: 8px 16px;
  border-bottom: 1px solid rgba(156, 255, 67, .18); background: rgba(156, 255, 67, .07); color: #d9ffc3; text-align: center; font-size: 13px;
}
.announcement strong { color: var(--lime); letter-spacing: .08em; }
.announcement a { text-decoration: underline; text-underline-offset: 3px; }
.header { position: sticky; top: 0; z-index: 10; height: var(--header-h); border-bottom: 1px solid var(--line); background: rgba(7, 16, 25, .84); backdrop-filter: blur(18px); }
.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; letter-spacing: .08em; }
.brand-mark { width: 12px; height: 12px; border: 2px solid var(--cyan); transform: rotate(45deg); box-shadow: 0 0 18px rgba(74, 222, 255, .55); flex: none; }
.nav-links { display: flex; align-items: center; gap: 24px; color: #b9c5d1; font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--ink); }
.menu-button { display: none; background: none; color: var(--ink); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; min-height: 44px; }

/* Cards & grids */
.card {
  position: relative; min-height: 200px; padding: 25px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(20, 35, 50, .82), rgba(11, 21, 31, .76)); overflow: hidden;
}
.card::before { content: ""; position: absolute; top: 0; left: 0; width: 55px; height: 2px; background: var(--cyan); }
.card.amber::before { background: var(--amber); }
.card.violet::before { background: var(--violet); }
.card.lime::before { background: var(--lime); }
.card.red::before { background: var(--red); }
.card-num { color: var(--muted); font-family: var(--mono); font-size: 11px; letter-spacing: .08em; }
.card h3 { margin: 40px 0 8px; font-size: 22px; letter-spacing: -.02em; }
.card p { color: var(--muted); font-size: 14px; }
.cards-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.cards-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }

/* Footer */
footer.site-footer { padding: 58px 0 35px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.footer-brand p { margin-top: 14px; color: var(--muted); max-width: 350px; font-size: 14px; }
.footer-col strong { display: block; margin-bottom: 14px; font-size: 13px; }
.footer-col a { display: block; padding: 6px 0; color: var(--muted); font-size: 13px; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap; margin-top: 50px; padding-top: 22px; border-top: 1px solid var(--line); color: #8a98a8; font-size: 12px; }
.footer-bottom address { font-style: normal; }

/* Subpage article layout */
.article { padding: 72px 0 96px; }
.article-inner { width: min(760px, calc(100% - 48px)); margin-inline: auto; }
.article h1 { font-size: clamp(30px, 4vw, 48px); line-height: 1.2; letter-spacing: -.03em; font-weight: 800; margin: 12px 0 14px; }
.article h2 { font-size: clamp(20px, 2.4vw, 26px); letter-spacing: -.02em; margin: 44px 0 12px; padding-top: 24px; border-top: 1px solid var(--line); }
.article p, .article li { color: var(--ink-2); font-size: 16px; }
.article p + p { margin-top: 14px; }
.article ul { padding-left: 1.3em; margin: 10px 0; }
.article li { margin: 6px 0; }
.article a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.article .meta { color: var(--dim); font-family: var(--mono); font-size: 12px; letter-spacing: .06em; }
.article .address-block { margin: 18px 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255, 255, 255, .02); font-style: normal; line-height: 1.9; }
.article .address-block strong { color: var(--ink); }

@media (max-width: 1050px) {
  .cards-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 780px) {
  :root { --header-h: 64px; }
  .shell { width: min(100% - 28px, var(--max)); }
  .section { padding: 80px 0; }
  .section-tight { padding: 64px 0; }
  .announcement { font-size: 12px; line-height: 1.5; }
  .nav-links {
    display: none; position: absolute; top: calc(var(--header-h) + 8px); left: 14px; right: 14px; padding: 12px; flex-direction: column; align-items: stretch; gap: 0;
    border: 1px solid var(--line); border-radius: 16px; background: #0b1621; box-shadow: 0 25px 60px rgba(0, 0, 0, .38);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 10px; min-height: 44px; }
  .nav-links .button { margin: 6px 0; }
  .menu-button { display: block; }
  .cards-2, .cards-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
  .button-row .button { width: 100%; }
}
@media (max-width: 480px) {
  .headline { font-size: 42px; }
  .section-title { font-size: 33px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}