/* ステップメール 案内サイト（dev-dialogue.com/stepmail/）。ロイヤルループとは別の見た目にする */
:root {
  --blue: #2d7ef7; --green: #20c997; --gray: #607d8b;
  --ink: #1f2937; --muted: #5b6474; --soft: #8a93a3;
  --bg: #f6f8fb; --line: #e5e9f0; --card: #fff;
  --radius: 14px; --shadow: 0 6px 20px rgba(20, 40, 80, .06);
  --maxw: 1040px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif; color: var(--ink); background: #fff; line-height: 1.8; }
a { color: var(--blue); }
img { max-width: 100%; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ヘッダー */
header.site { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.95); border-bottom: 1px solid var(--line); backdrop-filter: blur(6px); }
.nav { display: flex; align-items: center; gap: 18px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; }
.brand .mark { display: inline-flex; gap: 3px; }
.brand .mark i { display: block; width: 8px; height: 20px; border-radius: 3px; }
.sp { flex: 1; }
.nav .lk { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav .lk:hover { color: var(--ink); }
.btn { display: inline-block; background: var(--blue); color: #fff; text-decoration: none; font-weight: 700; padding: 12px 24px; border-radius: 999px; border: 2px solid var(--blue); }
.btn:hover { filter: brightness(1.05); }
.btn.ghost { background: #fff; color: var(--blue); }
.btn.sm { padding: 6px 16px; font-size: 14px; }

/* ヒーロー */
.hero { background: linear-gradient(160deg, #eef4ff 0%, #ecfaf5 60%, #fff 100%); padding: 72px 0 56px; }
.badge { display: inline-block; background: #fff; border: 1px solid var(--line); color: var(--muted); font-size: 13px; padding: 4px 12px; border-radius: 999px; }
.hero h1 { font-size: 40px; line-height: 1.4; margin: 18px 0 12px; letter-spacing: .02em; }
.hero h1 .u { background: linear-gradient(transparent 62%, rgba(32, 201, 151, .35) 62%); }
.hero .lead { font-size: 17px; color: var(--muted); max-width: 680px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.hero .note { font-size: 13px; color: var(--soft); margin-top: 10px; }

/* セクション */
section { padding: 64px 0; }
section.alt { background: var(--bg); }
h2 { font-size: 28px; line-height: 1.5; margin: 0 0 8px; }
h2 + .sub { color: var(--muted); margin: 0 0 28px; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .ico { font-size: 26px; margin-bottom: 6px; }

/* 3種類 */
.series .card { border-top: 6px solid var(--k); }
.series .no { display: inline-block; background: var(--k); color: #fff; font-weight: 700; border-radius: 8px; padding: 2px 10px; font-size: 13px; margin-bottom: 8px; }
.k1 { --k: var(--blue); } .k2 { --k: var(--green); } .k3 { --k: var(--gray); }
.series dl { margin: 12px 0 0; font-size: 14px; }
.series dt { font-weight: 700; color: var(--ink); }
.series dd { margin: 0 0 6px; color: var(--muted); }
.rule { margin-top: 18px; font-size: 14px; color: var(--muted); }
h3.tt { font-size: 18px; margin: 32px 0 10px; }
.tw { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: 10px; }
table.cmp { border-collapse: collapse; width: 100%; min-width: 860px; font-size: 14px; background: #fff; }
table.cmp th, table.cmp td { border-bottom: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
table.cmp th { background: var(--bg); white-space: nowrap; font-size: 13px; color: var(--muted); }
table.cmp tr td:first-child { border-left: 5px solid var(--k); white-space: nowrap; font-weight: 700; }
table.cmp .no { display: inline-block; background: var(--k); color: #fff; border-radius: 6px; padding: 0 8px; font-size: 12px; }

/* 効果測定の図 */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.compare div { border-radius: 10px; padding: 12px 14px; font-size: 14px; }
.compare .a { background: #eef4ff; border: 1px solid #cfe0fd; }
.compare .b { background: #f1f4f6; border: 1px solid #d5dee3; }
.compare b { display: block; font-size: 22px; }

/* 流れ */
ol.flow { list-style: none; padding: 0; margin: 0; counter-reset: s; display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
ol.flow li { counter-increment: s; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 18px 58px; position: relative; font-size: 15px; }
ol.flow li::before { content: counter(s); position: absolute; left: 16px; top: 16px; width: 30px; height: 30px; border-radius: 50%; background: var(--green); color: #fff; font-weight: 700; display: flex; align-items: center; justify-content: center; }
ol.flow b { display: block; }

/* 料金・リンク */
.price { font-size: 15px; }
.links { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.links a.card { text-decoration: none; color: var(--ink); }
.links a.card:hover { border-color: var(--blue); }

footer { background: #1f2937; color: #cbd5e1; padding: 32px 0; font-size: 14px; }
footer a { color: #e2e8f0; margin-right: 16px; }
footer .copy { margin-top: 12px; color: #94a3b8; font-size: 12px; }

@media (max-width: 720px) {
  .nav .lk { display: none; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  section { padding: 48px 0; }
  .compare { grid-template-columns: 1fr; }
}