:root {
  color-scheme: light;
  --paper: #faf8f3;
  --panel: #fffdf8;
  --ink: #1c1917;
  --body: #44403c;
  --muted: #79716b;
  --line: #e8e2d6;
  --line-soft: #efeade;
  --rust: #c2410c;
  --rust-deep: #9a3412;
  --rust-soft: #fbf0e7;
  --rust-tint: #fdf6f0;
  --serif: Georgia, "Times New Roman", "Songti SC", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Heiti SC", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--rust-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, p { margin-top: 0; }

.page {
  width: min(880px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 30px 0 64px;
}

/* ---- top bar ---- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}
.wordmark { font-weight: 800; letter-spacing: 0.01em; color: var(--ink); }
.wordmark:hover { text-decoration: none; color: var(--rust-deep); }
.issue {
  font-family: var(--serif);
  font-style: italic;
  color: var(--muted);
  font-size: 15px;
  white-space: nowrap;
}
.issue b { color: var(--rust); font-style: normal; }

/* ---- hero ---- */
.hero { display: grid; grid-template-columns: auto 1fr; gap: 26px; align-items: start; }
.hero-num {
  font-family: var(--serif);
  font-size: 76px;
  line-height: 0.9;
  font-weight: 700;
  color: var(--rust);
  letter-spacing: -0.02em;
}
.eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--rust);
  margin-bottom: 12px;
}
h1 {
  font-size: 44px;
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 800;
  margin-bottom: 16px;
}
.lead { max-width: 640px; color: var(--body); font-size: 19px; line-height: 1.7; margin-bottom: 0; }
.lead-line { display: block; }
.lead-line.accent { color: var(--ink); font-weight: 700; margin-top: 6px; }

/* ---- setup band ---- */
.setup { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 38px 0 18px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
}
.card.scene h2 { font-size: 17px; }
.card.scene p { margin: 0; color: var(--body); line-height: 1.72; }
.kicker {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 10px;
}
.card.method { background: var(--rust-tint); border-color: #f3ddca; }
.card.method .kicker { color: var(--rust); }
.method-row { display: grid; gap: 7px; }
.method-row p { margin: 0; color: var(--body); line-height: 1.6; }
.method-row .tag { font-weight: 800; color: var(--rust); }
.method-row .slogan {
  margin-top: 5px;
  padding-top: 10px;
  border-top: 1px solid #f3ddca;
  font-weight: 800;
  color: var(--ink);
}

/* ---- step compass ---- */
.compass {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 30px 0 6px;
  color: var(--muted);
  font-size: 14px;
  flex-wrap: wrap;
}
.compass .label { font-weight: 700; color: var(--ink); }
.compass .seq { display: inline-flex; align-items: center; gap: 8px; }
.compass .pip {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 999px;
  background: var(--rust); color: #fff; font-weight: 800; font-size: 14px;
}
.compass .arr { color: #d6cdbd; }

/* ---- story rail ---- */
.rail { margin-top: 18px; }
.station {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 20px;
  position: relative;
  padding-bottom: 36px;
}
.station:last-child { padding-bottom: 0; }
.rail-col { position: relative; display: flex; justify-content: center; }
.station:not(:last-child) .rail-col::after {
  content: "";
  position: absolute;
  top: 50px; bottom: -36px; left: 50%;
  transform: translateX(-50%);
  width: 2px;
  background: linear-gradient(var(--rust) 0 6px, transparent 6px 12px) repeat-y;
  background-size: 2px 12px;
  opacity: 0.45;
}
.mark {
  width: 46px; height: 46px; border-radius: 999px;
  background: var(--rust); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 21px; font-weight: 800;
  box-shadow: 0 2px 0 #b8390a;
  z-index: 1;
}
.station-body { padding-top: 3px; }
.station-head { margin-bottom: 12px; }
.station-head h2 { font-size: 22px; margin-bottom: 5px; }
.station-head .hint { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; }

.quote {
  margin: 0 0 16px;
  border-left: 3px solid var(--rust);
  background: var(--rust-soft);
  border-radius: 0 10px 10px 0;
  padding: 13px 16px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.66;
  overflow-wrap: anywhere;
}

/* ---- screenshot window ---- */
.shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 12px 30px -18px rgba(28, 25, 23, 0.35);
}
.shot-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 13px;
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
}
.shot-dots { display: flex; gap: 6px; }
.shot-dots i { width: 10px; height: 10px; border-radius: 999px; background: #e0d8c8; display: block; }
.shot-title { font-size: 13px; color: var(--muted); }
.shot img { width: 100%; display: block; }
.shot-cap {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--body);
  font-size: 14px;
  line-height: 1.6;
  background: var(--panel);
}
.shot-cap b { color: var(--rust-deep); }

.bridge {
  max-width: 620px;
  margin: 22px 0 22px 66px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
  font-style: italic;
  font-family: var(--serif);
}

/* ---- deliverable: dark tree variant (no preview image) ---- */
.deliver {
  margin-top: 44px;
  background: var(--ink);
  color: #f5f5f4;
  border-radius: 14px;
  padding: 26px 28px;
}
.deliver .kicker { color: #f0a17e; }
.deliver h2 { color: #fff; font-size: 22px; margin-bottom: 14px; }
.deliver-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.deliver ul { margin: 0; padding-left: 18px; }
.deliver li { color: #d6d3d1; line-height: 1.7; margin-bottom: 6px; }
.tree {
  margin: 0;
  background: #292524;
  border: 1px solid #44403c;
  color: #e7e5e4;
  border-radius: 10px;
  padding: 16px 18px;
  font-family: Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.85;
  overflow: auto;
}
.tree .f { color: #fbbf24; }
.tree .note { color: #a8a29e; }

/* ---- deliverable: light preview-card variant ---- */
.result { margin-top: 44px; }
.result-card {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 24px;
  align-items: start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
}
.frame {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 12px 30px -18px rgba(28, 25, 23, 0.35);
}
.frame img { width: 100%; display: block; }
.result-card h2 { font-size: 22px; margin-bottom: 6px; }
.result-card .sub { margin: 0 0 14px; color: var(--muted); font-size: 15px; line-height: 1.6; }
.done-list { margin: 0; padding-left: 20px; color: var(--body); }
.done-list li { line-height: 1.7; margin-bottom: 6px; }
.file-list { margin: 16px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.file-list li {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 9px;
  padding: 10px 12px;
  line-height: 1.5;
  font-size: 14px;
  color: var(--body);
}
.file-list code { color: var(--ink); font-family: Menlo, Consolas, monospace; font-size: 13px; }
.file-list a { color: var(--rust-deep); font-weight: 700; }

/* ---- takeaway ---- */
.takeaway {
  margin-top: 34px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 28px;
}
.takeaway .kicker { color: var(--rust); }
.takeaway h2 { font-size: 26px; line-height: 1.25; margin-bottom: 12px; }
.takeaway .sub { max-width: 680px; color: var(--body); line-height: 1.72; margin-bottom: 20px; }
.handoff {
  display: grid; gap: 10px;
  background: var(--rust-tint);
  border-left: 3px solid var(--rust);
  border-radius: 0 10px 10px 0;
  padding: 16px 18px;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.62;
}
.handoff b { color: var(--rust); }
.closing-line {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-weight: 700;
  line-height: 1.7;
}

/* ---- pager ---- */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 34px; }
.pager a {
  display: grid; gap: 4px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 12px;
  padding: 15px 18px;
  color: var(--ink);
}
.pager a:hover { border-color: #e0b79c; text-decoration: none; }
.pager .dir { font-size: 13px; color: var(--muted); }
.pager .ttl { font-weight: 700; }
.pager .next { text-align: right; }

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

@media (max-width: 720px) {
  .page { width: min(100vw - 28px, 620px); padding-top: 22px; }
  .hero { grid-template-columns: 1fr; gap: 8px; }
  .hero-num { font-size: 54px; }
  h1 { font-size: 32px; }
  .setup, .deliver-grid, .result-card, .pager { grid-template-columns: 1fr; }
  .station { grid-template-columns: 38px 1fr; gap: 14px; }
  .mark { width: 38px; height: 38px; font-size: 18px; }
  .station:not(:last-child) .rail-col::after { top: 42px; }
  .bridge { margin-left: 52px; }
  .pager .next { text-align: left; }
}