:root {
  --paper: #f4f1ea;
  --ink: #1a1a1a;
  --ink-soft: #5a5750;
  --line: #d9d4c7;
  --card: #fbf9f4;
  --accent: #1a1a1a;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #16161a;
    --ink: #ecebe6;
    --ink-soft: #a7a49b;
    --line: #34343a;
    --card: #1e1e23;
    --accent: #ecebe6;
  }
}
:root[data-theme="dark"] {
  --paper: #16161a;
  --ink: #ecebe6;
  --ink-soft: #a7a49b;
  --line: #34343a;
  --card: #1e1e23;
  --accent: #ecebe6;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

header.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 0;
}
.brand { font-weight: 700; letter-spacing: .02em; text-decoration: none; font-size: 17px; }
.brand small { font-weight: 400; color: var(--ink-soft); margin-left: 8px; }
nav.links { display: flex; gap: 18px; font-size: 14px; }
nav.links a { text-decoration: none; color: var(--ink-soft); }
nav.links a:hover { color: var(--ink); }

.hero {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: center;
  padding: 36px 0 56px;
}
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -.01em; }
.hero p.lead { font-size: 18px; color: var(--ink-soft); margin: 0 0 28px; max-width: 32em; }
.screen {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
}
.screen img { border-radius: 6px; image-rendering: -webkit-optimize-contrast; }
.btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 18px; border-radius: 999px; text-decoration: none;
  font-weight: 600; font-size: 15px; border: 1.5px solid var(--accent);
}
.btn.primary { background: var(--accent); color: var(--paper); }
.btn.ghost { color: var(--ink); }

.strip { border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line); padding: 14px 0; overflow: hidden; }
.strip img { width: 100%; max-width: none; filter: var(--img-filter, none); }

section { padding: 56px 0; }
section h2 { font-size: 28px; margin: 0 0 8px; letter-spacing: -.01em; }
section p.sub { color: var(--ink-soft); margin: 0 0 32px; max-width: 40em; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.card .tag { display: inline-block; font-size: 12px; color: var(--ink-soft); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; margin-bottom: 12px; }

.shots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.shots figure { margin: 0; }
.shots figcaption { font-size: 13px; color: var(--ink-soft); margin-top: 8px; text-align: center; }

.how ol { padding-left: 1.2em; margin: 0; color: var(--ink-soft); }
.how li { margin: 8px 0; }
.how code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; color: var(--ink); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--ink-soft); font-size: 14px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
footer a { text-decoration: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .screen { background: #0f0f12; }
  :root:not([data-theme="light"]) .screen img, :root:not([data-theme="light"]) .strip img, :root:not([data-theme="light"]) .shots img { filter: invert(1); }
}
:root[data-theme="dark"] .screen { background: #0f0f12; }
:root[data-theme="dark"] .screen img, :root[data-theme="dark"] .strip img, :root[data-theme="dark"] .shots img { filter: invert(1); }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding: 16px 0 40px; }
  .hero .screen { order: -1; max-width: 360px; margin: 0 auto; }
  .grid3, .shots, .two { grid-template-columns: 1fr; }
  nav.links { gap: 12px; }
  section { padding: 40px 0; }
}