:root {
  --bg: #050505;
  --panel: #0c0c0c;
  --line: #2a2a2a;
  --text: #e8e8e8;
  --muted: #8a8a8a;
  --accent: #ffb000;
  --ink: #050505;
  --hero-fade: rgba(5, 5, 5, 0.55);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255, 176, 0, 0.08), transparent 60%),
    linear-gradient(180deg, #0a0a0a 0%, var(--bg) 28%, var(--bg) 100%);
  color: var(--text);
  font-family: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 15px;
  line-height: 1.55;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 3vw, 2rem);
  background: rgba(5, 5, 5, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.mark {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.mark:hover { color: var(--accent); text-decoration: none; }

.top nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.85rem;
}

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

.hero {
  position: relative;
  display: grid;
  align-items: end;
  min-height: calc(100vh - 52px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-stage {
  margin: 0;
  position: absolute;
  inset: 0;
  background: #000;
  animation: stage-in 1s ease both;
}

.hero-stage img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top left;
  opacity: 0.55;
}

.hero-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(105deg, rgba(5, 5, 5, 0.96) 0%, rgba(5, 5, 5, 0.88) 34%, rgba(5, 5, 5, 0.35) 58%, rgba(5, 5, 5, 0.55) 100%),
    linear-gradient(0deg, rgba(5, 5, 5, 0.7), transparent 42%);
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 38rem;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1rem, 3vw, 2rem) clamp(2.5rem, 7vw, 5rem);
}

.brand {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  animation: rise 0.7s ease both;
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 14ch;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: clamp(2.4rem, 5.5vw, 4.25rem);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.03em;
  animation: rise 0.7s ease 0.08s both;
}

.lede {
  margin: 0 0 1.5rem;
  max-width: 38ch;
  color: #b7b7b7;
  animation: rise 0.7s ease 0.16s both;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise 0.7s ease 0.24s both;
}

.meta {
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 1.1rem;
  border: 1px solid #444;
  border-radius: 2px;
  font: inherit;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease, transform 0.12s ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink);
}

.btn.primary:hover { filter: brightness(1.05); }

.btn.ghost {
  background: rgba(5, 5, 5, 0.45);
  color: var(--text);
  backdrop-filter: blur(4px);
}

.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
  transform: none;
}

.features {
  display: flex;
  flex-direction: column;
  gap: clamp(3rem, 8vw, 6rem);
  padding: clamp(2rem, 6vw, 5rem) clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}

.feature {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: center;
}

.feature.reverse { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }
.feature.reverse .feature-copy { order: 2; }
.feature.reverse figure { order: 1; }

.feature h2 {
  margin: 0 0 0.75rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.feature p {
  margin: 0;
  max-width: 42ch;
  color: var(--muted);
}

.feature figure {
  margin: 0;
  border: 1px solid var(--line);
  background: #000;
  overflow: hidden;
}

.feature img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top left;
}

.strip {
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
  background: var(--panel);
}

.strip h2 {
  margin: 0 0 1.25rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
}

.strip ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
}

.strip li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.75rem;
  border-top: 2px solid var(--accent);
}

.strip strong {
  color: var(--text);
  font-size: 0.95rem;
}

.strip span {
  color: var(--muted);
  font-size: 0.85rem;
}

.download {
  padding: clamp(2.5rem, 7vw, 5rem) clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
  max-width: 48rem;
}

.download h2 {
  margin: 0 0 0.75rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
}

.fine {
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  max-width: 52ch;
}

.fine code {
  color: var(--text);
  background: #141414;
  border: 1px solid var(--line);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
  font-size: 0.9em;
}

.status-note {
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
  max-width: 42rem;
}

.status-note h2 {
  margin: 0 0 0.75rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.status-note p {
  margin: 0;
  color: var(--muted);
  max-width: 48ch;
}

.status-inline {
  color: #b7b7b7 !important;
}

.foot {
  padding: 1.5rem clamp(1rem, 3vw, 2rem) 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.foot p { margin: 0 0 0.4rem; max-width: 70ch; }

.manual {
  max-width: 42rem;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem) clamp(3rem, 6vw, 4rem);
}

.manual-hero {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.manual-hero h1 {
  margin: 0 0 0.75rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.manual-toc {
  margin: 0 0 2.5rem;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
}

.manual-toc a { color: var(--muted); }
.manual-toc a:hover { color: var(--accent); }

.manual-section {
  margin: 0 0 2.25rem;
  padding-top: 0.25rem;
}

.manual-section h2 {
  margin: 0 0 0.75rem;
  font-family: Syne, "IBM Plex Mono", sans-serif;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.manual-section p,
.manual-section li {
  color: #b7b7b7;
}

.manual-section p { margin: 0 0 0.85rem; }

.manual-section ul,
.manual-section ol {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
}

.manual-section li { margin: 0 0 0.45rem; }

.manual-section strong { color: var(--text); font-weight: 700; }

.manual-section code,
.manual-section pre {
  font-family: inherit;
  font-size: 0.9em;
}

.manual-section code {
  color: var(--text);
  background: #141414;
  border: 1px solid var(--line);
  padding: 0.1rem 0.35rem;
  border-radius: 2px;
}

.manual-section pre {
  margin: 0.75rem 0 1rem;
  padding: 0.85rem 1rem;
  background: #0a0a0a;
  border: 1px solid var(--line);
  overflow-x: auto;
  color: var(--text);
}

.manual-section pre code {
  border: 0;
  background: transparent;
  padding: 0;
}

.top nav a[aria-current="page"] { color: var(--text); }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

@keyframes stage-in {
  from { opacity: 0; transform: translateY(18px) scale(0.985); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .hero { min-height: 78vh; }

  .feature,
  .feature.reverse {
    grid-template-columns: 1fr;
  }

  .feature.reverse .feature-copy,
  .feature.reverse figure { order: initial; }

  .hero h1 { max-width: none; }

  .hero-stage img { opacity: 0.4; }

  .strip ul { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .strip ul { grid-template-columns: 1fr; }
  .top nav { gap: 0.85rem; font-size: 0.78rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .brand, .hero h1, .lede, .cta, .hero-stage {
    animation: none;
  }
  .btn:hover { transform: none; }
}