/* 公式サイト（otosazu.com）。色は docs/brand/README.md のロゴの色と、閲覧ページ（server/public/share.css）に合わせる */
:root {
  --bg: #fbf1ec;
  --card: #ffffff;
  --ink: #3a2a25;
  --muted: #8a6f66;
  --accent: #c8553d;
  --accent-ink: #ffffff;
  --track: #e8b9ac;
  --line: #e6d6cf;
  --shadow: 0 10px 30px rgba(58, 42, 37, 0.12);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f1715;
    --card: #2a211e;
    --ink: #f5ebe7;
    --muted: #b79c93;
    --accent: #e2735a;
    --accent-ink: #1f1715;
    --track: #6b3a2f;
    --line: #463a36;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Noto Sans JP", "Noto Sans CJK JP", "Segoe UI", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3 { line-height: 1.3; margin: 0; }
h2 { font-size: 1.5rem; margin-bottom: 20px; }
h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 1em;
  margin-right: 10px;
  vertical-align: -0.12em;
  border-radius: 3px;
  background: var(--accent);
}
section { padding: 48px 0; }
main, header.top, footer { width: min(1100px, 100% - 32px); margin: 0 auto; }

/* 上の帯 */
header.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}
header.top .brand { display: inline-flex; }
.logo.dark { display: none; }
@media (prefers-color-scheme: dark) {
  .logo.light { display: none; }
  .logo.dark { display: block; }
}
header.top nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.95rem; }
header.top nav a { color: var(--ink); text-decoration: none; }
header.top nav a:hover { color: var(--accent); }

/* 冒頭 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 36px;
  align-items: center;
  padding-top: 24px;
}
.kicker { color: var(--accent); font-weight: 700; margin: 0 0 8px; letter-spacing: 0.04em; }
.hero h1 { font-size: clamp(2rem, 4.2vw, 3rem); letter-spacing: 0.02em; }
.lead { font-size: 1.05rem; margin: 18px 0 24px; }
.hero-shot img, .shots img {
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.cta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.cta .note { color: var(--muted); font-size: 0.9rem; }
.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  background: var(--card);
}
.button.primary { background: var(--accent); color: var(--accent-ink); }
.button:hover { filter: brightness(1.06); }

/* できること */
.features .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.features article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px;
}
.features h3 { font-size: 1.05rem; margin-bottom: 8px; }
.features p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* 画面 */
.shots { display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); gap: 28px; }
.shots figure { margin: 0; }
.shots figcaption { color: var(--muted); font-size: 0.92rem; margin-top: 10px; }

/* 安心 */
.safe ul { margin: 0; padding-left: 1.3em; }
.safe li { margin: 6px 0; }

/* ダウンロード */
.download .req { display: grid; grid-template-columns: max-content 1fr; gap: 8px 18px; margin: 28px 0 0; font-size: 0.95rem; }
.download dt { color: var(--muted); }
.download dd { margin: 0; }

footer { padding: 32px 0 48px; color: var(--muted); border-top: 1px solid var(--line); margin-top: 24px; }
footer p { margin: 4px 0; }
.small { font-size: 0.85rem; }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; }
  .shots { grid-template-columns: 1fr; }
  .download .req { grid-template-columns: 1fr; gap: 2px; }
  .download dt { margin-top: 10px; }
  section { padding: 36px 0; }
}