/* SayBack — sayback.jp 共通スタイル */
:root {
  --teal: #136156; --teal-2: #1b7d6f; --teal-soft: #e6f2ef;
  --rec: #c8322b;
  --bg: #fbfaf7; --panel: #ffffff; --fg: #16202b; --mute: #5b6875; --line: #e2e5e3;
  --shadow: 0 1px 2px rgba(16,32,43,.06), 0 8px 28px rgba(16,32,43,.08);
  --radius: 14px;
  --w: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --teal: #54c3b2; --teal-2: #6fd3c3; --teal-soft: #15302c;
    --rec: #e0554c;
    --bg: #0f1213; --panel: #171b1d; --fg: #eef1f0; --mute: #a1abb0; --line: #2a3033;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35);
  }
}
* { 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", "Hiragino Kaku Gothic ProN",
               "Noto Sans JP", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  font-size: 16px; line-height: 1.8; letter-spacing: .01em;
  font-feature-settings: "palt" 1;
}
a { color: var(--teal); }
a:hover { color: var(--teal-2); }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--w); margin: 0 auto; padding: 0 20px; }

/* ヘッダー */
.site-head { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--fg);
  font-weight: 800; font-size: 20px; letter-spacing: -.01em; }
.brand:hover { color: var(--fg); }
.brand b { font-weight: 800; }
.brand span { color: var(--teal); }
.mark { width: 26px; height: 26px; fill: var(--teal); stroke: var(--teal); flex: none; }
.site-head nav { margin-left: auto; display: flex; gap: 22px; font-size: 14.5px; }
.site-head nav a { color: var(--mute); text-decoration: none; }
.site-head nav a:hover { color: var(--fg); }
@media (max-width: 560px) { .site-head nav { gap: 14px; font-size: 13.5px; } .site-head nav .opt { display: none; } }

/* ボタン */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px; border-radius: 999px; font-weight: 700; font-size: 16px;
  text-decoration: none; border: 1px solid transparent; }
.btn-primary { background: var(--teal); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary { color: #06201c; } }
.btn-primary:hover { background: var(--teal-2); color: #fff; }
.btn-primary[aria-disabled="true"] { opacity: .55; pointer-events: none; }
.btn-ghost { border-color: var(--line); color: var(--fg); background: var(--panel); }
.btn-ghost:hover { border-color: var(--teal); color: var(--fg); }

/* ヒーロー */
.hero { padding: 72px 0 40px; text-align: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; color: var(--teal);
  background: var(--teal-soft); padding: 4px 12px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(30px, 5.4vw, 52px); line-height: 1.3; margin: 0 0 18px; letter-spacing: -.02em; font-weight: 800; }
.hero h1 em { font-style: normal; color: var(--teal); }
.hero .lead { font-size: clamp(16px, 2vw, 18.5px); color: var(--mute); max-width: 640px; margin: 0 auto 30px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.cta-note { font-size: 13.5px; color: var(--mute); margin-top: 14px; }
.shot { margin: 48px auto 0; max-width: 980px; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid var(--line); background: #0f0f0f; }
.shot img { width: 100%; }
figcaption { font-size: 13px; color: var(--mute); text-align: center; margin-top: 10px; }

/* セクション */
section { padding: 72px 0; }
section.alt { background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { text-align: center; margin-bottom: 40px; }
.sec-head h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 10px; letter-spacing: -.01em; line-height: 1.4; }
.sec-head p { color: var(--mute); margin: 0 auto; max-width: 620px; }

/* 3 ステップ */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px 24px; }
section:not(.alt) .step { background: var(--panel); }
.step .num { font-size: 12.5px; font-weight: 800; color: var(--teal); letter-spacing: .08em; }
.step h3 { font-size: 21px; margin: 4px 0 2px; letter-spacing: -.005em; }
.step .ja { font-size: 13.5px; color: var(--mute); margin-bottom: 12px; }
.step p { margin: 0; font-size: 15px; }
.step .ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: var(--teal-soft); color: var(--teal); margin-bottom: 14px; }
.step .ico svg { width: 24px; height: 24px; }
.step.rec .ico { background: color-mix(in srgb, var(--rec) 14%, transparent); color: var(--rec); }

/* 特長 */
.feats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 28px; max-width: 900px; margin: 0 auto; }
@media (max-width: 720px) { .feats { grid-template-columns: 1fr; } }
.feat { display: flex; gap: 14px; align-items: flex-start; padding: 6px 0; }
.feat .dot { flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--teal-soft); color: var(--teal);
  display: grid; place-items: center; margin-top: 2px; }
.feat .dot svg { width: 16px; height: 16px; }
.feat h3 { font-size: 16.5px; margin: 0 0 2px; }
.feat p { margin: 0; color: var(--mute); font-size: 15px; }

.split { display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }
.split .shot { margin: 0; }
.split h2 { font-size: clamp(22px, 3vw, 30px); margin: 0 0 12px; line-height: 1.45; }
.split p { color: var(--mute); margin: 0 0 12px; }

/* 料金 */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; max-width: 960px; margin: 0 auto; }
@media (max-width: 820px) { .plans { grid-template-columns: 1fr; max-width: 460px; } }
.plan { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; display: flex; flex-direction: column; }
section:not(.alt) .plan { background: var(--panel); }
.plan.pro { border: 2px solid var(--teal); position: relative; }
.plan.pro .tag { position: absolute; top: -12px; left: 24px; background: var(--teal); color: #fff; font-size: 12px;
  font-weight: 800; padding: 2px 10px; border-radius: 999px; }
@media (prefers-color-scheme: dark) { .plan.pro .tag { color: #06201c; } }
.plan h3 { margin: 0; font-size: 17px; }
.plan .price { font-size: 34px; font-weight: 800; letter-spacing: -.02em; margin: 8px 0 2px; line-height: 1.2; }
.plan .price small { font-size: 14px; font-weight: 600; color: var(--mute); letter-spacing: 0; }
.plan .sub { font-size: 13.5px; color: var(--mute); margin-bottom: 14px; }
.plan ul { list-style: none; padding: 0; margin: 0; font-size: 15px; }
.plan li { padding: 7px 0 7px 26px; position: relative; border-top: 1px dashed var(--line); }
.plan li::before { content: ""; position: absolute; left: 4px; top: 15px; width: 10px; height: 6px;
  border-left: 2px solid var(--teal); border-bottom: 2px solid var(--teal); transform: rotate(-45deg); }
.plans-note { text-align: center; color: var(--mute); font-size: 14px; margin-top: 22px; }

/* FAQ */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; list-style: none; font-weight: 700; padding: 14px 32px 14px 0; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 10px; font-size: 22px; font-weight: 400; color: var(--teal); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 16px; color: var(--mute); font-size: 15px; }

/* フッター */
.site-foot { padding: 40px 0 48px; border-top: 1px solid var(--line); font-size: 14px; color: var(--mute); }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.site-foot nav a { color: var(--mute); }
.site-foot .copy { margin-left: auto; }
@media (max-width: 720px) { .site-foot .copy { margin-left: 0; width: 100%; } }

/* 規約ページ */
.doc { max-width: 780px; margin: 0 auto; padding: 48px 20px 72px; }
.doc h1 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 6px; line-height: 1.4; letter-spacing: -.01em; }
.doc .date { color: var(--mute); font-size: 14px; margin: 0 0 32px; }
.doc h2 { font-size: 20px; margin: 40px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 16.5px; margin: 26px 0 6px; }
.doc p, .doc li { font-size: 15.5px; }
.doc ol, .doc ul { padding-left: 1.4em; }
.doc li { margin: 4px 0; }
.doc .note { background: var(--teal-soft); border-radius: 10px; padding: 14px 18px; margin: 16px 0; font-size: 15px; }
.doc code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em;
  background: var(--panel); border: 1px solid var(--line); padding: 1px 5px; border-radius: 5px; }
.tbl { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
.tbl th, .tbl td { text-align: left; vertical-align: top; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.tbl th { color: var(--mute); font-weight: 700; white-space: nowrap; }
.tbl thead th { border-bottom: 2px solid var(--line); }
.tbl.kv th { width: 34%; white-space: normal; }
@media (max-width: 600px) {
  .tbl.kv, .tbl.kv tbody, .tbl.kv tr, .tbl.kv th, .tbl.kv td { display: block; width: 100%; }
  .tbl.kv th { border-bottom: 0; padding-bottom: 0; }
  .tbl.kv td { padding-top: 2px; }
  .scroll-x { overflow-x: auto; }
}
.back { display: inline-block; margin-bottom: 20px; font-size: 14px; text-decoration: none; }
br.pc{} @media (max-width:600px){ br.pc{display:none} }
.hero h1 { word-break: keep-all; overflow-wrap: anywhere; }
.plans.two { grid-template-columns: repeat(2, 1fr); max-width: 720px; }
@media (max-width: 820px) { .plans.two { grid-template-columns: 1fr; max-width: 460px; } }