:root {
  --ink: #14110f;
  --muted: #6a5e55;
  --line: #e2d4c6;
  --paper: #f7f1ea;
  --card: #fffaf4;
  --accent: #d45212;
  --accent-dark: #b33f0b;
  --max: 1080px;
}

* { box-sizing: border-box; font-family: Arial, Helvetica, sans-serif; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}
a { color: var(--accent); }
img { max-width: 100%; }

.wrap {
  width: min(var(--max), calc(100% - 2.4rem));
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.78);
  border-bottom: 1px solid rgba(255, 176, 64, 0.22);
  backdrop-filter: blur(10px);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: #ffe7b8;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.12em;
}
.brand img {
  width: 36px;
  height: 36px;
  display: block;
  border-radius: 8px;
}
.nav-links {
  display: flex;
  gap: 1.1rem;
  align-items: center;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.nav-links a {
  color: #f3e4d2;
  text-decoration: none;
  font-size: 0.95rem;
}
.nav-links a:hover { color: #ffd27a; }

.btn {
  display: inline-block;
  padding: 0.72rem 1.15rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 650;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink); }
.btn-ghost-light {
  background: transparent;
  color: #fff6ea;
  border-color: rgba(255, 210, 122, 0.55);
}
.btn-ghost-light:hover { border-color: #ffd27a; color: #fff; }

.banner {
  position: relative;
  overflow: hidden;
  min-height: 34rem;
  padding: 5.2rem 0 4.4rem;
  color: #fff8ee;
  background: #000;
  border-bottom: 1px solid rgba(212, 82, 18, 0.35);
}
.banner-bg {
  position: absolute;
  inset: -28px;
  pointer-events: none;
  background: url("/banner.png?v=6") center / cover no-repeat;
  filter: blur(12px);
  transform: scale(1.08);
}
.banner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.38) 48%, rgba(0,0,0,0.2) 100%);
}
.banner-inner { position: relative; z-index: 1; }
.banner .kicker {
  color: #ffd27a;
  letter-spacing: 0.28em;
}
.banner h1 {
  color: #fff;
  max-width: 16ch;
  text-shadow:
    0 2px 3px rgba(0, 0, 0, 0.85),
    0 8px 22px rgba(0, 0, 0, 0.7),
    0 18px 42px rgba(0, 0, 0, 0.45);
}
.banner .lede {
  color: #f0dcc6;
  max-width: 44rem;
  text-shadow: 0 1px 10px rgba(0,0,0,0.45);
}
.banner .meta { color: #d7b99a; }
.banner-github {
  position: absolute;
  right: 1.5rem;
  bottom: 1.3rem;
  z-index: 2;
  display: inline-flex;
  color: #f3e4d2;
}
.banner-github svg {
  width: 28px;
  height: 28px;
  display: block;
  filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.65));
}
.banner-github:hover { color: #ffd27a; }

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  color: var(--muted);
  margin: 0 0 0.8rem;
}
h1, h2, h3 { font-family: Arial, Helvetica, sans-serif; line-height: 1.2; }
h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.3rem);
  margin: 0 0 0.8rem;
  font-weight: 600;
}
.lede {
  max-width: 42rem;
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0 0 1.6rem;
}
.actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.meta {
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.92rem;
}

section { padding: 3.2rem 0; }
.section-title {
  font-size: 1.7rem;
  margin: 0 0 0.4rem;
}
.section-sub {
  color: var(--muted);
  margin: 0 0 1.6rem;
  max-width: 40rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.25rem 1.3rem;
  border-top: 3px solid var(--accent);
}
.card h3 { margin: 0 0 0.45rem; font-size: 1.2rem; }
.card p { margin: 0; color: var(--muted); }

.feature-list { display: grid; gap: 1rem; }
.feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem 1.4rem;
  align-items: start;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.25rem 1.3rem;
  border-top: 3px solid var(--accent);
}
.feature h3 { margin: 0 0 0.45rem; font-size: 1.2rem; }
.feature p { margin: 0; color: var(--muted); }
.feature .doc-video { margin: 0; }
@media (min-width: 860px) {
  .feature.has-video {
    grid-template-columns: minmax(16rem, 0.9fr) minmax(18rem, 1.1fr);
    align-items: center;
  }
}

.steps { counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.9rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step::before {
  counter-increment: step;
  content: counter(step);
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-family: Arial, Helvetica, sans-serif;
}
.step h3 { margin: 0 0 0.2rem; font-size: 1.08rem; }
.step p { margin: 0; color: var(--muted); }
.step .doc-video { margin: 0.9rem 0 0; }

.cite {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.2rem 1.3rem;
}
.cite pre {
  white-space: pre-wrap;
  font-size: 0.86rem;
  margin: 0.7rem 0 0;
  color: var(--muted);
}
.cite-actions { margin-top: 0.9rem; display: flex; gap: 0.6rem; flex-wrap: wrap; }

.docs h2 { font-size: 1.45rem; margin: 2.2rem 0 0.6rem; }
.docs h3 { font-size: 1.12rem; margin: 1.3rem 0 0.4rem; }
.docs p, .docs li { color: var(--ink); }
.docs ul, .docs ol { padding-left: 1.2rem; }
.docs code {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92em;
  background: #ece7dc;
  padding: 0.05em 0.35em;
}
.toc {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0 2rem;
}
.toc a { text-decoration: none; }
.toc ol { margin: 0.4rem 0 0; }

.doc-video {
  margin: 1.1rem 0 1.4rem;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 0.7rem;
}
.doc-video video {
  display: block;
  width: 100%;
  max-height: 28rem;
  background: #120c08;
}
.doc-video figcaption {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  border-top: 1px solid var(--line);
  padding: 1.8rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}
footer a { color: var(--muted); }
.footer-inner p { margin: 0 0 0.45rem; }
.footer-name {
  color: var(--ink);
  font-weight: 700;
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.video-card {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 0.8rem;
}
.video-card video {
  display: block;
  width: 100%;
  max-height: 28rem;
  background: #120c08;
}
.video-card figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}
.upload-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin: 1.2rem 0 2rem;
}
.video-admin {
  list-style: none;
  padding: 0;
  margin: 0;
}
.video-admin li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
}
.video-admin li:last-child { border-bottom: 1px solid var(--line); }

@media (max-width: 760px) {
  .grid { grid-template-columns: 1fr; }
  .wrap { width: min(var(--max), calc(100% - 1.4rem)); }
  .nav { gap: 0.5rem; min-height: 56px; }
  .brand { gap: 0.35rem; letter-spacing: 0.06em; font-size: 0.9rem; }
  .brand img { width: 28px; height: 28px; }
  .nav-links { gap: 0.55rem; }
  .nav-links a { font-size: 0.8rem; }
}