/* Ketcher beginner guide — pure static */
:root {
  --kg-ink: #15231f;
  --kg-muted: #5c6f69;
  --kg-line: #d5e2dd;
  --kg-card: #ffffff;
  --kg-bg: #f3f8f6;
  --kg-accent: #0f766e;
  --kg-accent-soft: #d9f3ef;
  --kg-warn: #b45309;
  --kg-radius: 14px;
  --kg-shadow: 0 10px 28px rgba(15, 40, 35, 0.07);
  font-family: "Source Sans 3", "Noto Sans SC", "PingFang SC", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body.ketcher-guide {
  background: var(--kg-bg);
  color: var(--kg-ink);
  line-height: 1.55;
  min-height: 100%;
}
body.ketcher-guide.embed {
  background: #fff;
}

.kg-page {
  max-width: 920px;
  margin: 0 auto;
  padding: 20px 16px 56px;
}
body.embed .kg-page { padding: 12px 14px 28px; max-width: none; }

.kg-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  font-weight: 650;
  font-size: 0.92rem;
  color: var(--kg-accent);
  text-decoration: none;
}
.kg-back:hover { text-decoration: underline; }
body.embed .kg-back { display: none; }

.kg-hero {
  padding: 20px 20px 16px;
  border: 1px solid var(--kg-line);
  border-radius: var(--kg-radius);
  background: var(--kg-card);
  box-shadow: var(--kg-shadow);
  margin-bottom: 14px;
}
.kg-hero__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}
.kg-hero h1 {
  margin: 0 0 8px;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}
.kg-hero p {
  margin: 0;
  color: var(--kg-muted);
  font-size: 0.96rem;
  max-width: 52rem;
}
.kg-lang {
  display: inline-flex;
  border: 1px solid var(--kg-line);
  border-radius: 999px;
  overflow: hidden;
  background: #fff;
}
.kg-lang button {
  border: 0;
  background: transparent;
  padding: 7px 12px;
  font: inherit;
  font-weight: 650;
  font-size: 0.82rem;
  color: var(--kg-muted);
  cursor: pointer;
}
.kg-lang button[aria-pressed="true"] {
  background: var(--kg-accent);
  color: #fff;
}

.kg-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  margin-bottom: 14px;
  padding: 10px 12px;
  border: 1px solid var(--kg-line);
  border-radius: 12px;
  background: var(--kg-card);
  position: sticky;
  top: 0;
  z-index: 3;
  box-shadow: 0 6px 16px rgba(15, 40, 35, 0.04);
}
.kg-toc strong { font-size: 0.88rem; }
.kg-toc a {
  font-size: 0.86rem;
  font-weight: 650;
  color: var(--kg-accent);
  text-decoration: none;
  cursor: pointer;
}
.kg-toc a:hover { text-decoration: underline; }

.kg-step {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.1fr);
  gap: 18px;
  align-items: start;
  margin-bottom: 12px;
  padding: 16px;
  border: 1px solid var(--kg-line);
  border-radius: var(--kg-radius);
  background: var(--kg-card);
  scroll-margin-top: 64px;
}
.kg-step--flip .kg-step__fig { order: -1; }
.kg-step__num {
  margin: 0 0 4px;
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kg-accent);
}
.kg-step h2 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  letter-spacing: -0.015em;
}
.kg-step ol, .kg-step ul {
  margin: 0 0 10px;
  padding-left: 1.2em;
  display: grid;
  gap: 7px;
}
.kg-step li { color: var(--kg-ink); }
.kg-muted {
  margin: 0;
  color: var(--kg-muted);
  font-size: 0.88rem;
}
.kg-callout {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--kg-accent-soft);
  color: #0b4f49;
  font-size: 0.9rem;
}
.kg-callout--warn {
  background: #fff7ed;
  color: #9a3412;
}

.kg-step__fig { margin: 0; }
.kg-step__fig svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--kg-line);
  background: #eef6f4;
  box-shadow: 0 8px 18px rgba(15, 40, 35, 0.05);
}
.kg-step__fig figcaption {
  margin-top: 7px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--kg-muted);
}

.kg-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 0;
}
.kg-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--kg-line);
  background: #f8fbfa;
  font-size: 0.82rem;
  font-weight: 600;
}
.kg-chip span {
  display: inline-grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 6px;
  background: #fff;
  border: 1px solid var(--kg-line);
  font-size: 0.78rem;
}

.kg-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}
.kg-cta a, .kg-cta button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 10px;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
}
.kg-cta .primary {
  background: var(--kg-accent);
  color: #fff;
}
.kg-cta .secondary {
  background: transparent;
  color: var(--kg-ink);
  border-color: var(--kg-line);
}

.kg-hotkeys {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 6px 0 0;
}
.kg-hotkeys th, .kg-hotkeys td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--kg-line);
  vertical-align: top;
}
.kg-hotkeys th { color: var(--kg-muted); font-weight: 650; width: 38%; }
.kg-hotkeys kbd,
.kg-step kbd {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--kg-line);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8rem;
}
.kg-step code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86em;
  padding: 1px 5px;
  border-radius: 5px;
  background: rgba(15, 40, 35, 0.06);
}

[data-lang-panel] { display: none; }
html[lang="zh"] [data-lang-panel="zh"],
html[lang="en"] [data-lang-panel="en"] { display: block; }
html[lang="zh"] .kg-step[data-lang-panel="zh"],
html[lang="en"] .kg-step[data-lang-panel="en"] { display: grid; }

@media (max-width: 860px) {
  .kg-step { grid-template-columns: 1fr; }
  .kg-step--flip .kg-step__fig { order: 0; }
  .kg-hero h1 { font-size: 1.28rem; }
}