/* Fcam pro · project site · dark viewfinder aesthetic · anchor hue: amber */
:root {
  --ink: #0d0d0d;
  --panel: #161616;
  --panel-2: #1f1f1f;
  --line: #333;
  --fg: #f3f3f3;
  --fg-soft: #b9b9b9;
  --accent: #ffc845;
  --accent-ink: #1a1300;
  --danger: #ff6b6b;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --wrap: 68rem;
  --radius: 0.9rem;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.35; letter-spacing: 0.01em; font-weight: 700; }
h1 { font-size: clamp(2rem, 6vw, 3.25rem); margin: 0 0 0.6em; }
h2 { font-size: clamp(1.5rem, 4vw, 2.1rem); margin: 0 0 0.6em; }
h3 { font-size: 1.15rem; margin: 0 0 0.3em; }
p { margin: 0 0 1em; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: var(--accent-ink); padding: 0.6em 1em; z-index: 10;
}
.skip-link:focus { left: 0; }

.page-width { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 5;
  background: rgba(13, 13, 13, 0.86);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto;
  display: flex; align-items: center; gap: 1rem;
  min-height: 60px;
}
.brand { display: flex; align-items: center; gap: 0.55rem; color: var(--fg); font-weight: 700; }
.brand:hover { text-decoration: none; }
.main-nav { margin-left: auto; display: flex; gap: 1.1rem; flex-wrap: wrap; }
.main-nav a { color: var(--fg-soft); font-size: 0.95rem; }
.main-nav a:hover { color: var(--fg); }
.nav-download { color: var(--accent) !important; }
.header-release { color: var(--fg-soft); font-family: var(--mono); font-size: 0.85rem; }

.hero { padding: clamp(2.5rem, 8vw, 5rem) 0 clamp(2rem, 6vw, 3.5rem); }
.hero-grid { display: grid; gap: 2.5rem; }
@media (min-width: 52rem) { .hero-grid { grid-template-columns: 1.15fr 0.85fr; align-items: center; } }
.release-line { color: var(--accent); font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.8rem; }
.hero-lead { color: var(--fg-soft); font-size: 1.1rem; max-width: 34ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.6rem; }
.button {
  display: inline-block; padding: 0.7em 1.3em; border-radius: var(--radius);
  background: var(--accent); color: var(--accent-ink); font-weight: 700;
}
.button:hover { text-decoration: none; filter: brightness(1.05); }
.button-secondary { background: transparent; color: var(--fg); border: 1px solid var(--line); }

.hero-aside { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; }
.hero-icon { display: grid; place-items: center; margin-bottom: 1rem; }
.aside-note { color: var(--fg-soft); font-size: 0.95rem; }
.aside-facts { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: 0.5rem; }
.aside-facts li { display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--line); padding-top: 0.5rem; font-size: 0.9rem; }
.aside-facts span { color: var(--fg-soft); }

.section { padding: clamp(2.5rem, 7vw, 4.5rem) 0; border-top: 1px solid var(--line); }
.section-dark { background: var(--panel); }
.section-heading { max-width: 52ch; margin-bottom: 2rem; }
.section-heading p { color: var(--fg-soft); }

.page-index { border-top: 1px solid var(--line); background: var(--panel-2); }
.page-index-inner { display: flex; flex-wrap: wrap; gap: 0.6rem 1.2rem; align-items: baseline; padding: 0.9rem 0; }
.page-index-label { color: var(--fg-soft); font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; }
.page-index ol { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; }
.page-index a { color: var(--fg-soft); font-size: 0.9rem; }

.feature-ledger { display: grid; gap: 0; margin: 0; }
.feature-row { display: grid; gap: 0.3rem 1.5rem; padding: 1.3rem 0; border-top: 1px solid var(--line); }
@media (min-width: 44rem) { .feature-row { grid-template-columns: 8.5rem 1fr; } }
.feature-number { color: var(--accent); font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; padding-top: 0.2rem; }
.feature-row dt { font-weight: 700; }
.feature-row dd { margin: 0; color: var(--fg-soft); }

.lang-chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.6rem; }
.lang-chips li { border: 1px solid var(--line); border-radius: 999px; padding: 0.35em 0.9em; font-size: 0.9rem; }

.step-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.8rem; }
.step-list li { display: grid; grid-template-columns: 1.8rem 1fr; gap: 0.8rem; align-items: start; }
.step-number { display: grid; place-items: center; width: 1.8rem; height: 1.8rem; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--line); font-family: var(--mono); font-size: 0.85rem; }
code { font-family: var(--mono); background: var(--panel-2); border: 1px solid var(--line); border-radius: 0.4rem; padding: 0.1em 0.4em; font-size: 0.92em; }
.hash { font-family: var(--mono); font-size: 0.8rem; color: var(--fg-soft); word-break: break-all; }
.release-warning { color: var(--fg-soft); font-size: 0.9rem; border-left: 2px solid var(--accent); padding-left: 1rem; margin-top: 1.5rem; }

.project-note { display: grid; gap: 1.5rem; }
@media (min-width: 44rem) { .project-note { grid-template-columns: 1fr 1fr; align-items: start; } }
.link-columns { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; }
.link-columns a { color: var(--fg); border-bottom: 1px solid var(--line); padding-bottom: 0.15rem; }

.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--fg-soft); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 0.6rem 1.5rem; justify-content: space-between; font-size: 0.9rem; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }