/* Juban Limited — quiet corporate minimalism.
   One stylesheet, two layouts:
     body.cover    — homepage (full-viewport centered wordmark)
     body.document — disclosure page (readable single-column document)
   No dependencies: system font stacks only, no images, no JS. */

:root {
  --ink: #1a1a1a;
  --ink-muted: #605c55;
  --paper: #fbfaf8;
  --hairline: #d9d5ce;
  --underline: #b8b3aa;
  --serif: ui-serif, "New York", Georgia, "Times New Roman",
    "Hiragino Mincho ProN", "Yu Mincho", YuMincho, "MS PMincho", serif;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  font-family: var(--serif);
  font-feature-settings: "palt";
  color: var(--ink);
  background: var(--paper);
  line-height: 1.8;
}

/* Links — understated: ink-colored, thin muted underline that darkens
   on hover. Rule is live now so the Phase-2 disclosure link needs no
   CSS work when uncommented. */
a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--underline);
  text-underline-offset: 0.3em;
}

a:hover {
  text-decoration-color: var(--ink);
}

a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: no-preference) {
  a {
    transition: text-decoration-color 150ms ease;
  }
}

/* Cover — homepage */
.cover main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
}

.cover h1 {
  margin: 0;
  font-size: clamp(1.75rem, 2.5vw + 1.25rem, 3rem);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

/* The one structural detail: a short hairline beneath the wordmark. */
.cover h1::after {
  content: "";
  display: block;
  width: 3.5rem;
  height: 1px;
  margin: 1.75rem auto 0;
  background: var(--ink);
}

.cover main p {
  margin: 2.25rem 0 0;
  font-size: 1rem;
}

/* Document — disclosure page */
.document main {
  flex: 1;
  width: 100%;
  max-width: 38rem;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 3rem;
  box-sizing: border-box;
}

.document h1 {
  margin: 0 0 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--hairline);
  font-size: clamp(1.375rem, 1.2vw + 1rem, 1.75rem);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.5;
}

.document h2 {
  margin: 2.75rem 0 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.5;
}

.document p {
  margin: 0 0 1.25em;
}

/* Optional EN section sits below the JA text behind its own hairline. */
.document [lang="en"] {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--hairline);
}

/* Footer — shared */
footer {
  padding: 2rem 1.5rem 2.5rem;
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}