/* D2C Analytics 公開サイト。帳簿のような落ち着いた紙面に、利益の段（売上 → 限界利益）を一本の緑で通す */
:root {
  --bg: #f7f8f6;
  --surface: #ffffff;
  --fg: #18201c;
  --muted: #59645e;
  --line: #dce2de;
  --accent: #1d6b55;
  --accent-soft: #e3f0ea;
  --font-display: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121715; --surface: #1a201d; --fg: #e4eae6; --muted: #9ba7a0; --line: #2b3430;
    --accent: #62c2a4; --accent-soft: #1e3a31;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--font-body); font-size: 16px; line-height: 1.8;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}
a { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 920px; margin: 0 auto; }
.site-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-block: 22px; border-bottom: 1px solid var(--line); }
.logo { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 700; font-size: 20px; color: var(--fg); text-decoration: none; letter-spacing: .01em; }
.logo span { color: var(--accent); }
.site-head nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; }
.site-head nav a { color: var(--muted); text-decoration: none; }
.site-head nav a:hover { color: var(--fg); }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 9px 18px; border-radius: 6px; text-decoration: none; font-size: 14px; font-weight: 500; }
@media (prefers-color-scheme: dark) { .btn { color: #0f1a16; } }

.hero { padding-block: 64px 40px; display: grid; gap: 20px; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em; color: var(--muted); }
h1 { font-family: var(--font-display); font-size: clamp(30px, 5.4vw, 46px); line-height: 1.3; margin: 0; text-wrap: balance; }
.lede { font-size: 17px; color: var(--muted); max-width: 40em; margin: 0; }

.ladder { margin-block: 12px 56px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 20px 22px; overflow-x: auto; }
.ladder table { border-collapse: collapse; width: 100%; min-width: 520px; font-variant-numeric: tabular-nums; }
.ladder th, .ladder td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14.5px; }
.ladder td.num { text-align: right; font-family: var(--font-mono); }
.ladder tr.key td { font-weight: 700; color: var(--accent); border-bottom: 0; }
.ladder caption { caption-side: bottom; text-align: left; color: var(--muted); font-size: 12.5px; padding-top: 10px; }

h2 { font-family: var(--font-display); font-size: 24px; margin: 0 0 16px; text-wrap: balance; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px 32px; margin-bottom: 64px; }
.features h3 { font-size: 16.5px; margin: 0 0 6px; }
.features p { margin: 0; color: var(--muted); font-size: 15px; }
.channels { color: var(--muted); font-size: 14.5px; margin: 0 0 64px; }
.channels strong { color: var(--fg); font-weight: 500; }

.trust { border-top: 1px solid var(--line); padding-top: 40px; margin-bottom: 64px; display: grid; gap: 14px; }
.trust ul { margin: 0; padding-left: 1.2em; color: var(--muted); display: grid; gap: 6px; }

.company { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 22px; margin-bottom: 64px; }
.company dl { display: grid; grid-template-columns: 9em minmax(0, 1fr); gap: 8px 16px; margin: 0; font-size: 15px; }
.company dt { color: var(--muted); }
.company dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }

/* 規約・ポリシーの本文 */
.doc { max-width: 44em; margin: 0 auto; padding-block: 48px 72px; }
.doc h1 { font-size: clamp(26px, 4.4vw, 34px); margin-bottom: 8px; }
.doc .meta { color: var(--muted); font-size: 14px; margin: 0 0 32px; }
.doc h2 { font-size: 19px; margin: 40px 0 10px; padding-top: 12px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 16px; margin: 22px 0 6px; }
.doc p, .doc li { font-size: 15.5px; }
.doc ol, .doc ul { padding-left: 1.4em; display: grid; gap: 4px; }
.doc table { border-collapse: collapse; width: 100%; font-size: 14.5px; margin-block: 8px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
.doc th { background: var(--accent-soft); font-weight: 500; }
.table-scroll { overflow-x: auto; }

.site-foot { border-top: 1px solid var(--line); padding-block: 24px 40px; color: var(--muted); font-size: 13.5px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.site-foot nav { display: flex; gap: 16px; flex-wrap: wrap; }
.site-foot a { color: var(--muted); }