:root {
  --ink: #14171a;
  --ink-soft: #5a6169;
  --ink-muted: #7d858e;
  --paper: #faf7f5;
  --card: #ffffff;
  --brand: #c4342a;
  --brand-dark: #a52a21;
  --brand-soft: #fbedeb;
  --gold: #b5701f;
  --gold-soft: #fdf3e6;
  --green: #2f7d5b;
  --green-soft: #eaf4ef;
  --line: #e4e7eb;
  --shadow: 0 16px 40px rgba(20, 23, 26, 0.08);
  --radius: 18px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Roboto Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible {
  outline: 3px solid rgba(196, 52, 42, 0.35);
  outline-offset: 3px;
}
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 20;
  padding: 10px 14px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.welfare-banner {
  background: linear-gradient(90deg, var(--gold-soft), #fff8ec 60%, var(--gold-soft));
  border-bottom: 1px solid #f0e2c8;
}
.welfare-banner-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--ink-soft);
}
.welfare-banner strong { color: var(--gold); letter-spacing: 0.04em; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(228, 231, 235, 0.9);
  background: rgba(250, 247, 245, 0.92);
  backdrop-filter: blur(14px);
}
.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--brand);
  border-radius: 10px;
  font-size: 14px;
}
.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
  color: var(--ink-soft);
  font-size: 14px;
}
.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--brand); }
.nav-cta, .button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease, transform 180ms ease, border-color 180ms ease;
  touch-action: manipulation;
}
.nav-cta:hover, .button:hover { background: var(--brand-dark); }
.nav-cta:active, .button:active { transform: translateY(1px); }
.button.secondary {
  border-color: var(--line);
  background: var(--card);
  color: var(--ink);
}
.button.secondary:hover { border-color: var(--brand); color: var(--brand); background: #fff; }
.button.quiet {
  border-color: var(--line);
  background: transparent;
  color: var(--ink-soft);
}

.hero { padding: 64px 0 76px; overflow: hidden; }
.hero-grid {
  display: grid;
  gap: 44px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--brand);
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 700px;
  margin-bottom: 20px;
  font-size: clamp(40px, 9vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}
h1 span { color: var(--brand); }
.hero-copy {
  max-width: 620px;
  color: var(--ink-soft);
  font-size: 18px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-note { margin: 16px 0 0; color: var(--ink-muted); font-size: 13px; }

.device-stage {
  position: relative;
  min-height: 420px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--brand-soft);
  overflow: hidden;
}
.device-stage::before, .device-stage::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(196, 52, 42, 0.2);
  border-radius: 50%;
}
.device-stage::before { width: 360px; height: 360px; }
.device-stage::after { width: 520px; height: 520px; }
.phone {
  position: relative;
  z-index: 1;
  width: min(252px, 72%);
  padding: 10px;
  border: 1px solid #272b31;
  border-radius: 32px;
  background: #181a1f;
  box-shadow: 18px 22px 0 rgba(20, 23, 26, 0.08);
  transform: rotate(3deg);
}
.phone-screen {
  min-height: 450px;
  padding: 18px 14px;
  overflow: hidden;
  border-radius: 24px;
  background: #f6f7f9;
}
.phone-top { display: flex; justify-content: space-between; color: var(--ink-muted); font: 11px var(--mono); }
.phone-title { margin: 28px 0 18px; font-size: 24px; font-weight: 800; }
.phone-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
}
.phone-card + .phone-card { margin-top: 10px; }
.phone-card strong { display: block; font-size: 15px; }
.phone-card small { display: block; margin-top: 4px; color: var(--ink-muted); font-size: 11px; }
.phone-bar { height: 7px; margin-top: 14px; border-radius: 99px; background: #f1d8d5; }
.phone-bar i { display: block; width: 68%; height: 100%; border-radius: inherit; background: var(--brand); }
.phone-chip {
  display: inline-flex;
  margin-top: 12px;
  padding: 4px 8px;
  border-radius: 99px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 11px;
  font-weight: 700;
}

.section { padding: 80px 0; }
.section.soft { background: var(--brand-soft); }
.section-head { max-width: 680px; margin-bottom: 28px; }
.section-kicker { margin-bottom: 8px; color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: 0.08em; }
h2 { margin-bottom: 12px; font-size: clamp(28px, 5vw, 44px); line-height: 1.14; letter-spacing: -0.03em; }
.section-head p { color: var(--ink-soft); }
.feature-grid { display: grid; gap: 12px; }
.feature {
  min-height: 184px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}
.feature-index { color: var(--brand); font: 700 13px var(--mono); }
.feature h3 { margin: 18px 0 8px; font-size: 18px; }
.feature p { margin-bottom: 0; color: var(--ink-soft); font-size: 14px; }

.price-layout { display: grid; gap: 20px; align-items: start; }
.price-card {
  padding: 28px;
  border: 1px solid var(--brand);
  border-radius: var(--radius);
  background: #fff;
}
.price-label { color: var(--ink-soft); font-size: 14px; }
.price { margin: 8px 0 8px; color: var(--brand); font: 800 54px/1 var(--mono); letter-spacing: -0.06em; }
.price.free { color: var(--green); }
.price small { color: var(--ink-soft); font: 400 15px var(--font); letter-spacing: 0; }
.check-list { display: grid; gap: 10px; padding: 0; margin: 22px 0; list-style: none; }
.check-list li { display: flex; gap: 9px; align-items: flex-start; color: var(--ink-soft); }
.check-list svg { flex: 0 0 18px; margin-top: 4px; color: var(--green); }
.price-aside { padding: 4px 0; color: var(--ink-soft); }
.price-aside strong { color: var(--ink); }
.notice {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
  background: var(--gold-soft);
  color: #76501d;
  font-size: 14px;
}

.faq { display: grid; gap: 10px; }
details {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
}
summary { cursor: pointer; font-weight: 700; }
details p { margin: 12px 0 0; color: var(--ink-soft); font-size: 14px; }

.closing {
  padding: 60px 0;
  background: var(--ink);
  color: #fff;
}
.closing p { max-width: 580px; color: #c4c9cf; }
.closing .button.secondary { border-color: #555b63; background: transparent; color: #fff; }
.footer { padding: 30px 0 42px; color: var(--ink-muted); font-size: 13px; }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer a { color: var(--ink-soft); text-decoration: none; }
.footer a:hover { color: var(--brand); }
.footer-note { margin-top: 18px; color: var(--ink-muted); font-size: 12px; }

.article-wrap { max-width: 780px; padding: 64px 0 90px; }
.article-wrap h1 { max-width: none; font-size: clamp(34px, 7vw, 56px); }
.article-meta { color: var(--ink-muted); font-size: 13px; }
.article-wrap h2 { margin-top: 42px; font-size: 26px; }
.article-wrap h3 { margin-top: 28px; font-size: 19px; }
.article-wrap p, .article-wrap li { color: var(--ink-soft); }
.article-wrap ul { padding-left: 22px; }
.article-wrap li + li { margin-top: 8px; }
.article-callout {
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}
.article-callout strong { color: var(--ink); }

@media (min-width: 700px) {
  .nav-links { display: flex; }
  .hero { padding-top: 88px; }
  .hero-grid { grid-template-columns: 1.05fr 0.95fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .price-layout { grid-template-columns: 0.9fr 1.1fr; }
}
@media (min-width: 960px) {
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .section { padding: 104px 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}