/* =============================================
   COMMON STYLES — squarewall
   全ページ共通のベーススタイル
   ============================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:  #111111;
  --gray1:  #444444;
  --gray2:  #888888;
  --gray3:  #cccccc;
  --gray4:  #eeeeee;
  --white:  #ffffff;
  --border: #e0e0e0;
  --pad-x:  64px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.8;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; }

/* ─── UTILITY ─── */
.inner { max-width: 1100px; margin: 0 auto; padding: 0 var(--pad-x); }

.label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray2);
  display: flex;
  align-items: center;
  gap: 10px;
}
.label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--gray2);
}

/* ─── HEADER ─── */
header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { text-decoration: none; display: flex; align-items: center; }
.logo-img { width: 200px; height: auto; display: block; }
.logo-dummy {
  height: 36px; padding: 0 14px;
  background: var(--gray4); border: 1px dashed var(--gray3);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gray2); font-weight: 600; white-space: nowrap;
}
.back-link {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gray2);
  text-decoration: none;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}
.back-link:hover { color: var(--black); }

/* ─── PAGE HEADER ─── */
.page-head {
  background: var(--black);
  border-bottom: 1px solid var(--border);
  padding: 56px var(--pad-x);
  color: var(--white);
}
.page-head-inner { max-width: 1100px; margin: 0 auto; }
.page-label {
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.page-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: rgba(255,255,255,0.4);
}
.page-head h1 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

/* ─── FOOTER ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 36px var(--pad-x);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo { text-decoration: none; display: flex; align-items: center; }
.footer-logo img { height: 28px; width: auto; display: block; }
.footer-logo .logo-dummy {
  height: 28px; padding: 0 12px;
  background: var(--gray4); border: 1px dashed var(--gray3);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gray2); font-weight: 600; white-space: nowrap;
}
.footer-copy { font-size: 11px; color: var(--gray2); letter-spacing: 0.04em; }

/* ─── SHARED COMPONENTS ─── */
.intro {
  font-size: 13.5px;
  color: var(--gray1);
  line-height: 2;
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.note {
  margin-top: 48px;
  padding: 24px 28px;
  background: var(--gray4);
  border: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--gray1);
  line-height: 2;
}

/* ─── RESPONSIVE (共通) ─── */
@media (max-width: 768px) {
  :root { --pad-x: 24px; }
  .page-head { padding: 40px var(--pad-x); }
}
@media (max-width: 480px) {
  :root { --pad-x: 20px; }
}