/* ===== farman landing page ===== */
/* 依存ゼロ。light / dark は prefers-color-scheme で自動切替。 */

:root {
  --bg:        #ffffff;
  --bg-alt:    #f5f6f8;
  --fg:        #1d2127;
  --fg-muted:  #5b6470;
  --border:    #e2e5ea;
  --accent:    #5b8def;
  --accent-fg: #ffffff;
  --card:      #ffffff;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 8px 24px rgba(0,0,0,.06);
  --radius:    12px;
  --maxw:      1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0f1216;
    --bg-alt:    #161a20;
    --fg:        #e6e9ee;
    --fg-muted:  #9aa4b2;
    --border:    #262c35;
    --accent:    #6f9bf5;
    --accent-fg: #0f1216;
    --card:      #161a20;
    --shadow:    0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
               "Noto Sans JP", Meiryo, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: .88em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 20px; flex-wrap: wrap; }
.nav a { color: var(--fg-muted); font-size: .95rem; }
.nav a:hover { color: var(--fg); text-decoration: none; }
.lang-switch {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 12px;
}
.lang-switch:hover { background: var(--bg-alt); }

/* ===== Hero ===== */
.hero {
  padding: 64px 24px 32px;
  text-align: center;
  background: radial-gradient(ellipse at top,
              color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%);
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; }
.hero-logo { margin-bottom: 8px; }
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  margin: 0 0 12px;
  letter-spacing: -.02em;
}
.hero h1 .pron {
  font-size: .3em;
  font-weight: 400;
  color: var(--fg-muted);
  letter-spacing: 0;
  vertical-align: middle;
  margin-left: .4em;
  white-space: nowrap;
}
.tagline {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--fg-muted);
  margin: 0 auto 28px;
  max-width: 620px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-sub {
  color: var(--fg-muted);
  font-size: .9rem;
  margin: 14px 0 0;
}
.hero-shot {
  margin: 44px auto 0;
  max-width: 920px;
}
.hero-shot img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, #000); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-alt); }

/* ===== Sections ===== */
.section { padding: 64px 24px; max-width: var(--maxw); margin: 0 auto; }
.section-alt { max-width: none; background: var(--bg-alt); }
.section-alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section h2 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  text-align: center;
  margin: 0 auto 40px;
}

/* ===== Feature grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
}
.feature h3 { margin: 0 0 8px; font-size: 1.1rem; }
.feature p { margin: 0; color: var(--fg-muted); font-size: .95rem; }

/* ===== Screenshots ===== */
.shot-group {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--fg);
  margin: 48px auto 22px;
}
.shot-group:first-of-type { margin-top: 0; }
.shot-grid + .shot-group { margin-top: 52px; }
.shot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.shot-grid figure { margin: 0; }
.shot-grid img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: block;
}
.shot-grid figcaption {
  text-align: center;
  color: var(--fg-muted);
  font-size: .9rem;
  margin-top: 10px;
}

/* ===== Download ===== */
.download-version, .download-note, .fallback {
  text-align: center;
  color: var(--fg-muted);
}
.download-version { font-size: 1.05rem; margin: -20px 0 32px; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}
.dl-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.dl-card.is-current {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 24%, transparent);
}
.dl-os { font-size: 1.2rem; font-weight: 700; margin: 0 0 4px; }
.dl-arch { color: var(--fg-muted); font-size: .85rem; margin: 0 0 18px; }
.dl-card .btn { width: 100%; margin-bottom: 10px; }
.dl-secondary {
  display: block;
  font-size: .9rem;
  color: var(--fg-muted);
}
.dl-note {
  margin: 14px 0 0;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--fg-muted);
  text-align: left;
  opacity: .9;
}
.download-note { font-size: .9rem; margin-top: 8px; }

/* ===== About the name ===== */
.about-name {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  color: var(--fg-muted);
}
.about-name p { margin: 0 0 16px; }
.about-name p:last-child { margin-bottom: 0; }
.about-name strong { color: var(--fg); font-weight: 600; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  color: var(--fg-muted);
  font-size: .9rem;
}
.site-footer a { color: var(--fg-muted); }
.site-footer a:hover { color: var(--fg); }
.copyright { margin: 8px 0 0; opacity: .8; }
.disclaimer {
  max-width: 760px;
  margin: 0 auto 20px;
  font-size: .82rem;
  line-height: 1.7;
  opacity: .85;
}