/*
 * shared.css — M-DEEP株式会社 全ページ共通スタイル
 * フォント: Noto Sans JP / DM Mono / Oswald (design-guidelines準拠)
 * 最終更新: 2026-04-16
 */

/* ── Design tokens ───────────────────────────────────────── */
:root {
  --bg:          #f6faff;
  --bg-alt:      #edf4fb;
  --surface:     #ffffff;
  --ink:         #333333;
  --ink-sub:     #666666;
  --ink-light:   #999999;
  --accent:      #333333;
  --accent-light:#666666;
  --border:      #d4e4f4;
  --white:       #ffffff;

  --font-sans:    "Noto Sans JP", sans-serif;
  --font-mono:    "DM Mono", monospace;
  --font-display: "Oswald", "Noto Sans JP", sans-serif;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 100%; scroll-behavior: smooth; }
body {
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── Language system (index_8.html: data-lang + body.lang-ja) ── */
[data-lang="en"] { display: block; }
[data-lang="ja"] { display: none; }
body.lang-ja [data-lang="en"] { display: none; }
body.lang-ja [data-lang="ja"] { display: block; }
span[data-lang="en"] { display: inline; }
span[data-lang="ja"] { display: none; }
body.lang-ja span[data-lang="en"] { display: none; }
body.lang-ja span[data-lang="ja"] { display: inline; }

/* ── Lang toggle button ──────────────────────────────────── */
.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-light);
  cursor: pointer;
  letter-spacing: 0.08em;
  transition: all 0.2s;
}
.lang-btn.active,
.lang-btn:hover {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  background: #1a2840;
  color: rgba(255,255,255,0.45);
  padding: 3rem 4rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-logo {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: #ffffff;
  margin-bottom: 0.5rem;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
}
.footer-lang {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}
.footer-legal {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}
.footer-legal a {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-legal a:hover { color: rgba(255,255,255,0.65); }
.footer-location {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-align: right;
}

/* ── Animations ──────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ── Mobile ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  footer {
    grid-template-columns: 1fr;
    padding: 2rem 1.5rem;
  }
  .footer-location { text-align: left; }
  .footer-lang { justify-content: flex-start; }
  .footer-legal { justify-content: flex-start; }
}