:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --border: rgba(0, 0, 0, 0.06);
  --accent: #0071e3;
  --accent-soft: rgba(0, 113, 227, 0.08);
  --green: #34c759;
  --radius-md: 16px;
  --maxw: 720px;
  --maxw-wide: 840px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --border: rgba(255, 255, 255, 0.08);
    --accent: #2997ff;
    --accent-soft: rgba(41, 151, 255, 0.12);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 0 80px;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.022em;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.content-nav {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

.content-nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.content-nav-brand:hover {
  text-decoration: none;
}

.content-nav-brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.content-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.content-nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.content-nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.content-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.content-wrap-wide {
  max-width: var(--maxw-wide);
}

.content-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 16px;
}

.lead {
  font-size: 19px;
  color: var(--text-secondary);
  margin: 0 0 32px;
  line-height: 1.5;
}

h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 48px 0 16px;
  color: var(--text);
}

h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 32px 0 12px;
  color: var(--text);
}

p {
  color: var(--text-secondary);
  margin: 0 0 16px;
}

ul,
ol {
  color: var(--text-secondary);
  padding-left: 1.35em;
  margin: 0 0 20px;
}

li {
  margin-bottom: 10px;
}

li strong {
  color: var(--text);
}

strong {
  color: var(--text);
  font-weight: 600;
}

.check-list {
  list-style: none;
  padding-left: 0;
}

.check-list li {
  position: relative;
  padding-left: 1.6em;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 600;
}

.faq-list {
  margin-top: 24px;
}

.faq-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.faq-item:first-child {
  border-top: 1px solid var(--border);
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.faq-item p {
  margin: 0;
  font-size: 16px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 0;
}

.related-links a {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
}

.related-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.cta-box {
  margin-top: 48px;
  padding: 32px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  text-align: center;
}

.cta-box h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.cta-box p {
  margin: 0 0 20px;
}

.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 980px;
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 500;
  text-decoration: none;
}

.btn-store:hover {
  opacity: 0.92;
  text-decoration: none;
}

.btn-store svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.content-footer {
  max-width: var(--maxw-wide);
  margin: 64px auto 0;
  padding: 32px 24px 0;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-tertiary);
}

.content-footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
}

.content-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.content-footer-links a {
  color: var(--text-tertiary);
  text-decoration: none;
}

.content-footer-links a:hover {
  color: var(--text-secondary);
  text-decoration: none;
}

.screenshot {
  margin: 32px 0;
  text-align: center;
}

.screenshot img {
  max-width: 240px;
  width: 100%;
  height: auto;
  border-radius: 24px;
  border: 1px solid var(--border);
}

.screenshot figcaption {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-tertiary);
}

.disclaimer {
  margin-top: 32px;
  padding: 16px 20px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.5;
}