:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #2b3140;
  --body: #4f5562;
  --mute: #6b7280;
  --line: #e4e7ec;
  --link: #0079ad;
  --hd-bg: #1d1f26;
  --shadow: 0 1px 2px rgba(29, 33, 41, 0.04), 0 4px 14px rgba(29, 33, 41, 0.06);
  --shadow-hover: 0 2px 4px rgba(29, 33, 41, 0.05), 0 12px 32px rgba(29, 33, 41, 0.12);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --panel: #1f2229;
    --ink: #eceef2;
    --body: #c4c8d0;
    --mute: #9aa0aa;
    --line: #2e323b;
    --link: #5cc3f0;
    --hd-bg: #0c0d10;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 28px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--link); }

.wrap {
  width: 100%;
  max-width: 880px;
  margin: 0 auto;
  padding: 72px 16px 48px;
  flex: 1;
}

.head { text-align: center; margin-bottom: 40px; }
.name {
  margin: 0 0 16px;
  color: var(--ink);
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.name-en {
  display: block;
  margin-top: 2px;
  color: var(--mute);
  font-size: 0.5em;
  font-weight: 500;
  letter-spacing: 0.08em;
}
.lead { margin: 0; }
.lead-en { margin-top: 6px; color: var(--mute); font-size: 14px; }

.brands {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 36px 24px 24px;
  border-radius: 16px;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.brand:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.brand:focus-visible { outline: 3px solid var(--link); outline-offset: 3px; }
.brand img { display: block; width: auto; height: 56px; max-width: 100%; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; align-items: center; text-align: center; }
.brand-desc { font-size: 15px; }
.brand-desc[lang="en"] { font-size: 13px; opacity: 0.75; }
.brand-url { font-size: 13px; font-weight: 600; letter-spacing: 0.02em; }

/* Eroge Japan は明るい背景用のロゴ、Henteko Doujin は暗い背景用のロゴ */
.brand-ej { background: #ffffff; color: #4f5562; border: 1px solid #e4e7ec; }
.brand-ej .brand-url { color: #d42f39; }
.brand-hd { background: var(--hd-bg); color: #d9dbe0; border: 1px solid #2a2d35; }
.brand-hd .brand-url { color: #f0864a; }


.foot {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 24px 16px 32px;
  color: var(--mute);
  font-size: 13px;
}
.foot a { color: var(--mute); }

/* プライバシーポリシー */
.doc { max-width: 760px; }
.doc h1 { color: var(--ink); font-size: 24px; margin: 0 0 24px; }
.doc h2 { color: var(--ink); font-size: 16px; margin: 28px 0 8px; }
.doc p, .doc ol { margin: 0 0 10px; }
.doc .back { display: inline-block; margin-bottom: 24px; font-size: 14px; }
.doc .h-en { margin-left: 6px; color: var(--mute); font-size: 14px; font-weight: 500; }
.doc .note { color: var(--mute); font-size: 14px; }

/* お問い合わせ */
.form { margin-top: 28px; display: grid; gap: 18px; }
.field { display: grid; gap: 6px; }
.field > span { color: var(--ink); font-size: 15px; font-weight: 600; }
.field > span [lang="en"] { margin-left: 4px; color: var(--mute); font-size: 13px; font-weight: 500; }
.req, .opt { margin-left: 8px; padding: 1px 6px; border-radius: 4px; font-size: 11px; font-weight: 600; vertical-align: 1px; }
.req { background: #fde8e8; color: #b42318; }
.opt { background: var(--line); color: var(--mute); }
.field input, .field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font: inherit;
}
.field textarea { resize: vertical; min-height: 10em; }
.field input:focus, .field textarea:focus { outline: 2px solid var(--link); outline-offset: 1px; border-color: transparent; }
.submit {
  justify-self: start;
  padding: 11px 28px;
  border: 0;
  border-radius: 8px;
  background: var(--ink);
  color: var(--bg);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.submit [lang="en"] { margin-left: 4px; font-size: 13px; opacity: 0.75; }
.submit:hover { opacity: 0.88; }
.form-error { margin: 20px 0 0; padding: 12px 14px; border-radius: 8px; background: #fde8e8; color: #b42318; }
.trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }