:root {
  --brand: #D96C47;
  --brand-dark: #B95536;
  --accent: #6F7F5E;
  --bg: #FAF7F2;
  --text: #33302B;
  --muted: #706A61;
  --surface: #FFFDF9;
  --button-text: #FFFFFF;
  --ring: rgba(217, 108, 71, 0.15);
  --border: rgba(51, 48, 43, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  color: var(--text);
  background: linear-gradient(180deg, var(--bg), #F4EFE7);
  font-family: ui-sans-serif, system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}
img { max-width: 100%; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.row { display: flex; gap: 16px; align-items: center; justify-content: space-between; min-height: 64px; }

header.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(160%) blur(10px);
  background: rgba(250, 247, 242, 0.86);
  border-bottom: 1px solid var(--border);
}
.logo { display: flex; gap: 10px; align-items: center; color: var(--text); text-decoration: none; }
.logo img { width: 34px; height: 34px; border-radius: 8px; }
.logo span { font-weight: 700; letter-spacing: .04em; }
.nav-actions a { color: var(--text); text-decoration: none; margin-left: 18px; opacity: .78; }
.nav-actions a:hover { opacity: 1; color: var(--brand-dark); }

.hero { position: relative; overflow: hidden; padding: 88px 0 72px; }
.hero::before { content: ""; position: absolute; width: 520px; height: 520px; right: -180px; top: -230px; border-radius: 50%; background: rgba(111, 127, 94, .09); }
.hero .grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 64px; align-items: center; }
.app-heading { display: flex; align-items: center; gap: 12px; color: var(--accent); font-weight: 700; letter-spacing: .06em; }
.app-heading img { width: 54px; height: 54px; border-radius: 13px; box-shadow: 0 10px 24px rgba(51, 48, 43, .12); }
.title { font-size: clamp(34px, 6vw, 58px); line-height: 1.22; margin: 22px 0 18px; letter-spacing: -.03em; }
.lead { font-size: clamp(16px, 2.8vw, 18px); color: var(--muted); margin-bottom: 28px; line-height: 1.9; }
.cta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn { appearance: none; border: 0; border-radius: 10px; padding: 13px 22px; font-weight: 600; text-decoration: none; display: inline-block; font-size: 15px; }
.btn.primary { background: var(--brand); color: var(--button-text); box-shadow: 0 10px 20px -10px var(--brand); }
.btn.is-disabled { cursor: default; opacity: .78; }
.shadow-ring { box-shadow: 0 0 0 8px var(--ring); }
.note { font-size: 12px; color: var(--muted); margin-top: 12px; }
.hero-visual { justify-self: center; width: min(100%, 350px); padding: 18px; border: 1px solid var(--border); border-radius: 32px; background: rgba(255, 253, 249, .72); box-shadow: 0 28px 70px rgba(51, 48, 43, .13); transform: rotate(1.5deg); }
.hero-visual img { display: block; border-radius: 20px; }

.section { padding: 72px 0; }
.section h2 { font-size: clamp(24px, 4vw, 32px); margin: 0 0 12px; }
.section p.desc { color: var(--muted); margin: 0 0 34px; line-height: 1.7; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { border: 1px solid var(--border); border-radius: 16px; padding: 22px; background: var(--surface); }
.card-mark { display: block; width: 10px; height: 10px; border-radius: 50%; background: var(--brand); }
.card-mark.moss { background: var(--accent); }
.card h3 { margin: 14px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); line-height: 1.8; }

.screenshots-section { overflow: hidden; background: rgba(111, 127, 94, .055); border-top: 1px solid var(--border); }
.screenshots { display: flex; gap: 20px; overflow-x: auto; padding: 6px 2px 26px; scroll-snap-type: x mandatory; scrollbar-color: var(--accent) transparent; }
.screenshots figure { flex: 0 0 min(74vw, 300px); margin: 0; scroll-snap-align: start; }
.screenshots img { display: block; width: 100%; border-radius: 22px; border: 1px solid var(--border); box-shadow: 0 14px 34px rgba(51, 48, 43, .11); }
.screenshots figcaption { margin-top: 12px; color: var(--muted); font-size: 14px; text-align: center; }

footer { padding: 34px 0; border-top: 1px solid var(--border); color: var(--muted); }
.footer-top { display: flex; gap: 24px; align-items: flex-start; justify-content: space-between; }
footer .links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: flex-end; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--brand-dark); }
.copyright { margin: 24px 0 0; font-size: 12px; }

.content { max-width: 840px; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
.content h1 { font-size: 2rem; margin-bottom: .5rem; }
.content .app-name, .content .update-date { color: var(--muted); }
.content .update-date { margin-bottom: 2rem; }
.content h2 { font-size: 1.45rem; margin-top: 2.5rem; margin-bottom: 1rem; color: var(--brand-dark); }
.content h3 { font-size: 1.15rem; margin-top: 2rem; margin-bottom: .75rem; }
.content p, .content ul, .content blockquote { line-height: 1.85; margin-bottom: 1rem; }
.content ul { padding-left: 1.5rem; }
.content li { margin-bottom: .55rem; }
.content strong { color: var(--text); }
.content hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }
.content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0 2rem; font-size: 14px; }
.content th, .content td { border: 1px solid var(--border); padding: 10px; text-align: left; vertical-align: top; line-height: 1.65; }
.content th { background: rgba(111, 127, 94, .09); }
.content blockquote { margin-left: 0; padding: 12px 18px; border-left: 3px solid var(--accent); background: rgba(111, 127, 94, .07); color: var(--muted); }
.back-link { display: inline-block; margin-bottom: 2rem; color: var(--brand-dark); text-decoration: none; }
.back-link.bottom { margin-top: 2rem; margin-bottom: 0; }
.back-link:hover { text-decoration: underline; }

.error-container { max-width: 600px; margin: 0 auto; padding: 16vh 1rem 4rem; text-align: center; }
.error-mark { width: 14px; height: 14px; margin: 0 auto 24px; border-radius: 50%; background: var(--accent); }
.error-code { font-size: 6rem; font-weight: 700; color: var(--brand); margin: 0; line-height: 1; }
.error-title { font-size: 1.5rem; margin: 1.25rem 0 2rem; }

[data-animate] { opacity: 0; transform: translateY(8px); animation: fadeIn .7s ease forwards; }
@keyframes fadeIn { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } [data-animate] { opacity: 1; transform: none; animation: none; } }
@media (max-width: 900px) { .hero { padding-top: 64px; } .hero .grid { grid-template-columns: 1fr; gap: 44px; } .features { grid-template-columns: 1fr 1fr; } .hero-visual { width: min(82%, 340px); } }
@media (max-width: 620px) { .nav-actions { display: none; } .features { grid-template-columns: 1fr; } .footer-top { flex-direction: column; } footer .links { flex-direction: column; gap: 12px; } .content table { display: block; overflow-x: auto; } }