/* SwingNote の公開サイト。スマホ前提。色はアプリのアイコン（空の水色と紺）から取る */
:root {
  --bg: #F6FAFC; --fg: #0B1F3A; --muted: #55677A; --line: #D3E1EA; --card: #FFFFFF;
  --accent: #0A66C8; --accent-ink: #FFFFFF; --sky1: #D4EFF8; --sky2: #0A66C8; --navy: #0B1F3A;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0B131B; --fg: #E6EEF4; --muted: #9FB2C2; --line: #243441; --card: #121D27;
    --accent: #7CC4E6; --accent-ink: #061527; --sky1: #1E4A72; --sky2: #061527; color-scheme: dark; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  font-size: 17px; line-height: 1.75; overflow-x: hidden; }
a { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
main, header.site, footer.site { max-width: 760px; margin: 0 auto; padding-inline: 20px; }
h1 { font-size: clamp(1.9rem, 7vw, 2.6rem); line-height: 1.25; margin: 0 0 10px; text-wrap: balance; letter-spacing: -.01em; }
h2 { font-size: 1.3rem; margin: 0 0 10px; }
h3 { font-size: 1.05rem; margin: 0 0 4px; }
p { margin: 0 0 1rem; }
ul { padding-left: 1.3em; margin: 0 0 1rem; }
li { margin: .2rem 0; }
.muted { color: var(--muted); }
.eyebrow { font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin: 0 0 6px; }

/* ヘッダー */
header.site { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-block: 12px; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
header.site .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); font-weight: 700; }
header.site .brand img { width: 30px; height: 30px; border-radius: 8px; }
header.site nav { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; justify-content: flex-end; }
header.site nav a { color: var(--muted); text-decoration: none; }

/* 最初の画面 */
.hero { padding-block: 20px 0; display: grid; gap: 14px; text-align: center; justify-items: center; }
.hero .icon { width: 84px; height: 84px; border-radius: 20px; box-shadow: 0 10px 28px rgba(11,31,58,.22); }
.hero .lead { font-size: 1.08rem; color: var(--muted); margin: 0; max-width: 34em; }
.hero .phone { width: min(72vw, 300px); aspect-ratio: 9 / 16; object-fit: cover; background: #000; margin-top: 8px; border-radius: 34px; border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(11,31,58,.25); mask-image: linear-gradient(to bottom, #000 62%, transparent); -webkit-mask-image: linear-gradient(to bottom, #000 62%, transparent); }
.cta { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: var(--accent-ink); text-decoration: none;
  font-weight: 700; padding: 13px 22px; border-radius: 999px; font-size: 1rem; }
.cta.soon { background: var(--line); color: var(--muted); cursor: default; }
.hint { font-size: 13px; color: var(--muted); margin: 0; }

/* 横スワイプの紹介 */
section { padding-block: 28px; }
#features { padding-top: 18px; }
.swipe-wrap { margin-inline: -20px; }
.swipe { display: flex; gap: 14px; overflow-x: auto; padding: 6px 20px 14px; scroll-snap-type: x mandatory; scroll-padding-inline: 20px;
  -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.swipe::-webkit-scrollbar { display: none; }
.card { flex: 0 0 min(78vw, 300px); scroll-snap-align: start; background: var(--card); border: 1px solid var(--line); border-radius: 22px; overflow: hidden; display: grid; grid-template-rows: auto 1fr; }
/* ようこそ画面と同じ組み方: 黒地・9:16 の絵・下に見出しと 1 行 */
.card.wel { background: #000; color: #fff; border: 0; grid-template-rows: auto auto; padding: 14px 14px 18px; gap: 12px; }
.card.wel .pic { aspect-ratio: 9 / 16; border-radius: 14px; overflow: hidden; background: #111; }
.card.wel .pic img, .card.wel .pic video { width: 100%; height: 100%; object-fit: cover; object-position: top; aspect-ratio: auto; display: block; }
.card.wel .txt { padding: 0; }
.card.wel h3 { color: #fff; font-size: 1.15rem; margin: 0 0 4px; line-height: 1.35; }
.card.wel p { color: rgba(255,255,255,.72); font-size: 13.5px; line-height: 1.55; }
.card img, .card video { width: 100%; aspect-ratio: 603 / 1100; object-fit: cover; object-position: top; background: #000; }
.card .txt { padding: 14px 16px 16px; }
.card .txt p { margin: 0; font-size: 15px; color: var(--muted); }
.card.plain { background: linear-gradient(160deg, var(--sky1), var(--sky2)); color: #fff; border: 0; grid-template-rows: 1fr; }
.card.plain .txt { align-self: end; }
.card.plain h3, .card.plain p { color: #fff; }
.card.plain p { color: rgba(255,255,255,.9); }
.dots { display: flex; justify-content: center; gap: 6px; margin-top: 2px; }
.dots span { width: 6px; height: 6px; border-radius: 50%; background: var(--line); transition: background .2s, transform .2s; }
.dots span.on { background: var(--accent); transform: scale(1.3); }

/* 約束 */
.promise { background: linear-gradient(135deg, #1F7FB8, #0B1F3A); color: #fff; border-radius: 22px; padding: 22px 22px 18px; }
.promise h2, .promise p { color: #fff; }
.promise p { color: rgba(255,255,255,.9); }
.promise ul { color: rgba(255,255,255,.92); margin: 0; }

/* こんな人に・Q&A */
.who { display: grid; gap: 10px; }
.who div { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 14px 16px; font-size: 15.5px; }
details { border-top: 1px solid var(--line); padding: 10px 0; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 10px; }
summary::after { content: "+"; color: var(--muted); }
details[open] summary::after { content: "–"; }
details p { margin: 8px 0 0; font-size: 15.5px; color: var(--muted); }

/* 規約・サポートのページ */
.legal h1 { font-size: 1.7rem; }
.legal h2 { font-size: 1.1rem; margin-top: 2rem; }
.legal p, .legal li { font-size: 16px; }
.lang { font-size: 14px; }
footer.site { padding-block: 32px 56px; font-size: 14px; color: var(--muted); border-top: 1px solid var(--line); margin-top: 24px; }
footer.site nav { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 8px; }
.copy { user-select: all; font-family: ui-monospace, Menlo, monospace; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .dots span { transition: none; } }

/* ご意見のページ */
form.fb { display: grid; gap: 14px; }
form.fb label { display: grid; gap: 6px; font-weight: 600; font-size: 15px; }
form.fb textarea, form.fb input { font: inherit; font-size: 16px; padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--fg); width: 100%; }
form.fb textarea { min-height: 160px; resize: vertical; }
form.fb .row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
form.fb button { font: inherit; font-weight: 700; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 999px; padding: 13px 24px; cursor: pointer; }
form.fb button[disabled] { opacity: .6; cursor: default; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.status { padding: 12px 14px; border-radius: 12px; font-size: 15px; }
.status.ok { background: #E3F6EA; color: #0F5132; }
.status.ng { background: #FBE7E4; color: #7A2A1F; }
@media (prefers-color-scheme: dark) { .status.ok { background: #123A26; color: #BFEFD2; } .status.ng { background: #4A1F19; color: #F6C8C0; } }