/* TF-EcoFlow 紹介ページ。業務画面(/app/)とは別に、軽量な1枚もののCSSで構成する。 */
:root {
  --fg: #22313f; --muted: #5d6d7e; --bg: #ffffff; --band: #eef3f7; --line: #d7dfe6;
  --accent: #1F4E79; --accent-strong: #173A5C; --on-accent: #ffffff; --card: #ffffff;
  --green: #2E8B57; --green-soft: #e6f3ec; --warn: #E67E22; --danger: #C0392B;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6ebf0; --muted: #a2b0bd; --bg: #14191f; --band: #1b222a; --line: #333e4a;
          --accent: #7fb3e3; --accent-strong: #a6ccf0; --on-accent: #0d1b2a; --card: #1f2730;
          --green: #6dc295; --green-soft: #1d2f27; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.8 "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Noto Sans", system-ui, -apple-system, "Segoe UI", sans-serif; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-strong); }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 820px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--bg); padding: 8px 12px; z-index: 10; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); font-weight: 800; font-size: 21px; white-space: nowrap; }
.brand svg { width: 34px; height: 34px; flex: none; }
.links { display: flex; gap: 20px; margin-right: auto; }
.links a { color: var(--fg); text-decoration: none; font-size: 15px; }
.links a:hover { color: var(--accent-strong); }
.actions { display: flex; align-items: center; gap: 12px; }
.lang select { font: inherit; font-size: 14px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--fg); min-height: 40px; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px;
  border-radius: 999px; font-weight: 700; text-decoration: none; font-size: 15px; border: 2px solid transparent; }
.btn.primary { background: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-strong); }
.btn.ghost { border-color: var(--accent); color: var(--accent-strong); }
.btn.big { min-height: 56px; padding: 0 28px; font-size: 17px; }
.btn:focus-visible, a:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

section { padding: 76px 0; }
.band { background: var(--band); }
h1, h2, h3, .lead, .eyebrow { word-break: auto-phrase; text-wrap: pretty; }
h1 { font-size: clamp(30px, 4.3vw, 46px); line-height: 1.32; margin: 10px 0 18px; letter-spacing: .01em; }
h2 { font-size: clamp(24px, 3vw, 32px); line-height: 1.4; margin: 0 0 14px; }
h2 + .lead { margin-bottom: 32px; }
h3 { font-size: 19px; margin: 0 0 12px; line-height: 1.5; }
.eyebrow { color: var(--accent-strong); font-weight: 700; margin: 0; font-size: 15px; letter-spacing: .04em; }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.cta .sub { color: var(--muted); font-size: 14px; }

.hero { padding-top: 56px; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: center; }
.split { display: grid; grid-template-columns: 1fr 1.1fr; gap: 52px; align-items: center; }
.split.rev > figure { order: -1; }
.checks { padding: 0; margin: 0 0 24px; list-style: none; }
.checks li { position: relative; padding-left: 30px; margin-bottom: 10px; }
.checks li::before { content: ""; position: absolute; left: 4px; top: .62em; width: 13px; height: 7px;
  border-left: 3px solid var(--green); border-bottom: 3px solid var(--green); transform: rotate(-45deg); }
.shot img { border-radius: 16px; border: 1px solid var(--line); box-shadow: 0 14px 44px rgba(16, 38, 60, .16); }
.shot.phone { max-width: 290px; margin: 0 auto; }
.shot.phone img { border-radius: 26px; }
figure { margin: 0; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 10px; text-align: center; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 8px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; text-align: center; }
.stat b { display: block; font-size: 30px; line-height: 1.3; color: var(--accent-strong); }
.stat span { color: var(--muted); font-size: 14px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.card ul { margin: 0; padding-left: 1.2em; }
.card li { margin-bottom: 8px; }
.card p { margin: 0; color: var(--muted); }
.card .tag { display: inline-block; font-size: 12px; font-weight: 700; color: var(--green);
  background: var(--green-soft); border-radius: 999px; padding: 3px 12px; margin-bottom: 10px; }

.pains { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 36px; }
.pain { border: 1px solid var(--line); border-left: 5px solid var(--danger); border-radius: 12px; padding: 18px 20px; background: var(--card); }
.pain strong { display: block; margin-bottom: 6px; }
.pain span { color: var(--muted); font-size: 15px; }

.steps { list-style: none; counter-reset: s; padding: 0; margin: 0 0 20px; }
.steps li { counter-increment: s; position: relative; padding: 0 0 22px 56px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 2px; width: 38px; height: 38px; border-radius: 50%;
  background: var(--accent); color: var(--on-accent); font-weight: 800; display: grid; place-items: center; }
.steps strong { display: block; font-size: 18px; }
.steps span { color: var(--muted); }
.note { color: var(--muted); font-size: 15px; }
.disclaimer { color: var(--muted); font-size: 14px; margin-top: 26px; }

.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 2px 22px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 700; padding: 16px 0; }
.faq details p { margin: 0 0 16px; color: var(--muted); }

.final { text-align: center; }
.final h2 { margin-bottom: 14px; }
.final .cta { justify-content: center; }

.foot { border-top: 1px solid var(--line); padding: 34px 0 44px; text-align: center; color: var(--muted); font-size: 14px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: center; margin-bottom: 12px; }
.foot p { margin: 4px 0; }
/* 著作権表記は会社サイトへのリンク。本文と同じ色で控えめに見せる */
.foot .copy a { color: inherit; text-decoration: none; }
.foot .copy a:hover { color: var(--accent-strong); text-decoration: underline; }

@media (max-width: 920px) {
  .links { display: none; }
  .bar { justify-content: space-between; gap: 12px; }
  .hero-grid, .split { grid-template-columns: 1fr; gap: 32px; }
  .split.rev > figure { order: 0; }
  .cards, .cards.two, .pains { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  section { padding: 54px 0; }
}
@media (max-width: 420px) {
  .wrap { padding: 0 16px; }
  .brand span { display: none; }
  .btn.big { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }