/* Hibikobo — site styles
 * Designed for the chosen Layout A direction.
 * Static, minimal, accessible. No build step required.
 */

/* ── Reset / base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; }
a { color: inherit; }
button { font: inherit; cursor: pointer; }

/* ── Design tokens ────────────────────────────────────────────── */
:root {
  --bg: #f5f1ea;          /* off-white paper */
  --ink: #1a1a1a;         /* primary text */
  --muted: #7a7770;       /* secondary text */
  --rule: rgba(122, 119, 112, 0.22);

  --font-display: "Tenor Sans", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-serif-en: "Cormorant Garamond", "Georgia", serif;
  --font-serif-ja: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;

  --pad-x: 56px;
  --pad-x-narrow: 32px;
}

/* Theme variants — toggleable per Tweaks (white / off-white / dark) */
[data-theme="white"]    { --bg: #ffffff; --ink: #1a1a1a; --muted: #7a7770; --rule: rgba(122,119,112,0.22); }
[data-theme="offwhite"] { --bg: #f5f1ea; --ink: #1a1a1a; --muted: #7a7770; --rule: rgba(122,119,112,0.22); }
[data-theme="dark"]     { --bg: #141414; --ink: #ece7dd; --muted: #8a847a; --rule: rgba(236,231,221,0.18); }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif-en);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .25s ease, color .25s ease;
}

html[lang="ja"] body { font-family: var(--font-serif-ja); }

/* ── Layout shell ─────────────────────────────────────────────── */
.site {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header / Footer ──────────────────────────────────────────── */
.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  color: var(--ink);
}

.site-header {
  padding: 28px var(--pad-x);
  font-size: 11px;
  letter-spacing: 0.24em;
}

.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.site-header .brand .wordmark {
  letter-spacing: 0.32em;
  padding-left: 0.32em;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.site-header nav a {
  text-decoration: none;
  color: var(--ink);
  opacity: 0.55;
  transition: opacity .2s ease;
}
.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  opacity: 1;
}

.site-header .divider {
  width: 1px;
  height: 12px;
  background: var(--muted);
  opacity: 0.4;
}

.site-header .lang {
  background: none;
  border: none;
  padding: 0;
  color: var(--ink);
  opacity: 0.45;
  letter-spacing: inherit;
}
.site-header .lang.is-active { opacity: 1; }

/* ── Mobile menu toggle (hamburger) ───────────────────────────── */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  margin: -8px;
  color: var(--ink);
  z-index: 30;
}
.menu-toggle .bar {
  display: block;
  width: 22px;
  height: 1px;
  background: currentColor;
  margin: 5px 0;
  transition: transform .25s ease, opacity .25s ease;
}
.menu-toggle[aria-expanded="true"] .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .bar:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.site-footer {
  padding: 36px var(--pad-x);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--muted);
  border-top: 1px solid var(--rule);
}
.site-footer .links {
  display: flex;
  gap: 32px;
}
.site-footer a {
  text-decoration: none;
  color: var(--muted);
}
.site-footer a:hover { color: var(--ink); }

/* ── HOME (Layout A) ──────────────────────────────────────────── */
.home-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px var(--pad-x);
}

.home-main .icon { color: var(--ink); }

.home-main .wordmark {
  margin-top: 32px;
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.42em;
  padding-left: 0.42em;
}

.home-main .tagline {
  margin-top: 14px;
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.36em;
  color: var(--muted);
}

.home-main .lead {
  margin-top: 64px;
  max-width: 540px;
  font-weight: 300;
  font-family: var(--font-serif-en);
  font-size: 22px;
  line-height: 1.7;
  letter-spacing: 0.01em;
}
html[lang="ja"] .home-main .lead {
  font-family: var(--font-serif-ja);
  font-size: 18px;
  line-height: 2.2;
  letter-spacing: 0.08em;
}

/* ── Privacy ──────────────────────────────────────────────────── */
.doc-main {
  flex: 1;
  width: 100%;
  max-width: 880px;
  margin: 0 auto;
  padding: 48px var(--pad-x) 80px;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--muted);
  margin-bottom: 16px;
}

.doc-main h1 {
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: 48px;
  letter-spacing: 0.01em;
  line-height: 1.2;
  margin: 0;
}
html[lang="ja"] .doc-main h1 {
  font-family: var(--font-serif-ja);
  font-size: 36px;
  letter-spacing: 0.08em;
}

.doc-main .meta {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.rule {
  width: 48px;
  height: 1px;
  background: var(--ink);
  margin: 40px 0;
  border: 0;
}

.doc-main p {
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: 18px;
  line-height: 1.65;
  letter-spacing: 0.005em;
  margin: 0 0 12px;
}
html[lang="ja"] .doc-main p {
  font-family: var(--font-serif-ja);
  font-size: 14px;
  line-height: 2.0;
  letter-spacing: 0.04em;
}
.doc-main .intro {
  font-size: 18px;
}
html[lang="ja"] .doc-main .intro { font-size: 15px; }

.doc-main section { margin-top: 48px; }

.doc-main h2 {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--ink);
  margin: 0 0 16px;
  font-weight: 400;
}

/* ── Contact ──────────────────────────────────────────────────── */
.contact-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px var(--pad-x);
}

.contact-main h1 {
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: 56px;
  letter-spacing: 0.01em;
  line-height: 1.1;
  margin: 0;
}
html[lang="ja"] .contact-main h1 {
  font-family: var(--font-serif-ja);
  font-size: 40px;
  letter-spacing: 0.08em;
}

.contact-main .lead {
  max-width: 540px;
  margin: 0;
  font-family: var(--font-serif-en);
  font-weight: 300;
  font-size: 20px;
  line-height: 1.55;
  letter-spacing: 0.005em;
}
html[lang="ja"] .contact-main .lead {
  font-family: var(--font-serif-ja);
  font-size: 16px;
  line-height: 2.0;
  letter-spacing: 0.06em;
}

.contact-main .email-block { margin-top: 56px; }

.contact-main .email-label {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--muted);
  margin-bottom: 14px;
}

.contact-main .email {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 6px;
}

.contact-main .response {
  margin-top: 56px;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 720px) {
  :root { --pad-x: 24px; }
  .site-header { padding: 22px var(--pad-x); }

  .menu-toggle { display: block; }

  .site-header nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    padding: 96px var(--pad-x) 48px;
    background: var(--bg);
    transform: translateY(-100%);
    transition: transform .35s cubic-bezier(.4, 0, .2, 1);
    z-index: 20;
    overflow-y: auto;
  }
  .site-header nav.is-open { transform: translateY(0); }

  .site-header nav a {
    width: 100%;
    padding: 18px 0;
    font-size: 13px;
    letter-spacing: 0.3em;
    border-bottom: 1px solid var(--rule);
    opacity: 1;
  }
  .site-header nav a[aria-current="page"] { opacity: 1; }
  .site-header nav a:not([aria-current="page"]) { opacity: 0.7; }

  .site-header .divider { display: none; }
  .site-header nav .lang-group {
    display: flex;
    gap: 24px;
    margin-top: 32px;
  }
  .site-header .lang { font-size: 13px; letter-spacing: 0.3em; }

  body.menu-open { overflow: hidden; }

  .home-main .wordmark { font-size: 22px; }
  .home-main .lead { font-size: 18px; margin-top: 48px; }
  html[lang="ja"] .home-main .lead { font-size: 16px; }
  .doc-main h1 { font-size: 32px; }
  html[lang="ja"] .doc-main h1 { font-size: 26px; }
  .contact-main h1 { font-size: 36px; }
  html[lang="ja"] .contact-main h1 { font-size: 30px; }
  .contact-main .email { font-size: 20px; }
}