/* html2mp4 — docs / editor aesthetic (not SaaS poster) */
@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap");

:root {
  --bg: #EEF0F3;
  --paper: #FFFFFF;
  --ink: #14161C;
  --muted: #5B6472;
  --line: #D4D8E0;
  --mark: #0F766E;
  --mark-soft: #F0FDFA;
  --code-bg: #1C1F27;
  --code-fg: #E6EAF0;
  --code-dim: #8B93A7;
  --radius: 6px;
  --max: 960px;
  --font: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 1.02rem;
}
a { color: var(--mark); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: #115E59; }
a:focus-visible { outline: 2px solid var(--mark); outline-offset: 3px; }
code {
  font-family: var(--mono); font-size: .88em; color: #0F3D3A;
  background: var(--mark-soft); padding: .1em .35em; border-radius: 3px;
}

.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: #fff; padding: .5rem 1rem; z-index: 99;
}
.skip:focus { left: 1rem; top: 1rem; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .75rem 0;
}
.brand {
  display: flex; align-items: center; gap: .55rem;
  color: var(--ink); font-weight: 600; letter-spacing: -.02em;
  text-decoration: none; font-size: 1.05rem;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand img, .brand .logo-img {
  width: 28px; height: 28px; display: block;
}
.brand .tag {
  color: var(--muted); font-weight: 400; font-size: .88rem;
  margin-left: .15rem;
}
.nav-links { display: flex; gap: 1.15rem; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); font-size: .92rem; text-decoration: none; font-weight: 500;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid transparent; border-radius: var(--radius);
  padding: .6rem 1rem; font-weight: 600; cursor: pointer;
  font-size: .92rem; text-decoration: none; font-family: inherit;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  color: #fff; background: var(--mark); border-color: var(--mark);
}
.btn-primary:hover { background: #115E59; color: #fff; }
.btn-ghost {
  color: var(--ink); background: var(--paper);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--muted); color: var(--ink); }

/* Hero */
.hero {
  padding: 2.75rem 0 2rem;
  display: grid; grid-template-columns: 1fr; gap: 1.75rem;
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 2rem;
  align-items: start;
}
.notice {
  font-size: .88rem; color: var(--muted);
  border-left: 3px solid var(--mark); padding-left: .75rem; margin: 0 0 1.1rem;
}
h1 {
  font-size: clamp(1.85rem, 4vw, 2.55rem);
  line-height: 1.18; letter-spacing: -.03em; margin: 0 0 .9rem;
  font-weight: 700;
}
.lead {
  color: var(--muted); font-size: 1.08rem; max-width: 38rem;
  margin: 0 0 1.35rem;
}
.lead strong { color: var(--ink); font-weight: 600; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .65rem; margin-bottom: 1rem; }
.meta-row {
  display: flex; flex-wrap: wrap; gap: .5rem .9rem;
  color: var(--muted); font-size: .86rem; font-family: var(--mono);
}

.figure {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem; margin: 0;
}
.figure img, .figure svg { display: block; width: 100%; height: auto; }
.figure figcaption {
  margin-top: .75rem; font-size: .82rem; color: var(--muted);
}

/* Sections */
section { padding: 2.25rem 0; }
section.band {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.sec-head { margin-bottom: 1.25rem; max-width: 40rem; }
h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.55rem);
  letter-spacing: -.02em; margin: 0 0 .45rem; font-weight: 650;
}
h3 { font-size: 1.05rem; margin: 0 0 .35rem; letter-spacing: -.01em; font-weight: 600; }
.muted { color: var(--muted); }

/* Guide index — list rows, not identical card grid */
.guide-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.guide-list li { border-bottom: 1px solid var(--line); }
.guide-list a {
  display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem;
  padding: 1rem 0; text-decoration: none; color: inherit;
}
.guide-list a:hover h3 { color: var(--mark); }
.guide-list .k {
  font-family: var(--mono); font-size: .78rem; color: var(--mark);
  padding-top: .2rem; font-weight: 500;
}
.guide-list p { margin: .2rem 0 0; color: var(--muted); font-size: .95rem; }

/* Timeline steps (real sequence) */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.timeline li {
  display: grid; grid-template-columns: 2.5rem 1fr; gap: 1rem;
  padding: 1rem 0; border-bottom: 1px solid var(--line);
}
.timeline li:last-child { border-bottom: 0; }
.timeline .n {
  font-family: var(--mono); font-size: .85rem; color: var(--mark);
  font-weight: 500; padding-top: .15rem;
}
.timeline p { margin: .25rem 0 0; color: var(--muted); }

/* Code */
.panel {
  background: var(--code-bg); border-radius: var(--radius); overflow: hidden;
  border: 1px solid #2A2F3A;
}
.panel-top {
  padding: .55rem .9rem; border-bottom: 1px solid #2A2F3A;
  color: var(--code-dim); font-size: .75rem; font-family: var(--mono);
}
.code, pre.code {
  margin: 0; padding: 1rem 1.05rem 1.15rem;
  font-family: var(--mono); font-size: .84rem; line-height: 1.55;
  color: var(--code-fg); white-space: pre-wrap; word-break: break-word;
  background: var(--code-bg);
}
.code .c { color: #5EEAD4; }

/* FAQ */
details.faq {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper); margin-bottom: .55rem; overflow: hidden;
}
details.faq summary {
  cursor: pointer; padding: .9rem 1rem; font-weight: 600; list-style: none;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq[open] summary { border-bottom: 1px solid var(--line); }
details.faq p { margin: 0; padding: .9rem 1rem 1rem; color: var(--muted); }

/* Prose pages */
.prose { max-width: 42rem; }
.prose h2 { margin-top: 2rem; }
.prose p, .prose li { color: var(--muted); }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose pre {
  background: var(--code-bg); border: 1px solid #2A2F3A;
  border-radius: var(--radius); padding: 1rem; overflow-x: auto;
  font-family: var(--mono); font-size: .84rem; color: var(--code-fg);
}
.prose code {
  font-family: var(--mono); font-size: .88em; color: #0F3D3A;
  background: var(--mark-soft); padding: .1em .35em; border-radius: 3px;
}
.prose pre code { background: none; color: inherit; padding: 0; }
.crumb { font-size: .85rem; color: var(--muted); margin: 1.35rem 0 0; }
.crumb a { text-decoration: none; color: var(--muted); }
.crumb a:hover { color: var(--mark); }
.next {
  margin-top: 2.25rem; padding-top: 1.25rem; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: .65rem;
}
.page-hero { padding: 1.5rem 0 0; }
.page-hero .figure { margin: 1.25rem 0 0; max-width: 42rem; }

/* Compare table */
.compare {
  overflow-x: auto; background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.compare table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.compare th, .compare td {
  text-align: left; padding: .7rem .75rem; border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.compare th { color: var(--muted); font-weight: 600; font-size: .82rem; background: #F7F8FA; }
.compare tr:last-child td { border-bottom: 0; }
.note { font-size: .82rem; color: var(--muted); }

footer.site {
  border-top: 1px solid var(--line); padding: 1.75rem 0 2.25rem;
  color: var(--muted); font-size: .88rem; background: var(--paper); margin-top: 1rem;
}
footer.site .foot {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: start;
}
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--mark); }
footer.site strong { color: var(--ink); }

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .guide-list a { grid-template-columns: 1fr; gap: .25rem; }
  .nav-links { display: flex; gap: .65rem; font-size: .82rem; width: 100%; order: 3; }
  .nav { flex-wrap: wrap; }
  .nav .btn { padding: .45rem .75rem; }
  section { padding: 1.75rem 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}