/* QuickQ 官方下载指南 — Editorial Handbook */
:root {
  --paper: #f6f1e8;
  --paper-deep: #efe6d6;
  --ink: #1a1a18;
  --ink-soft: #3d3a34;
  --navy: #1e3a6e;
  --navy-deep: #15284d;
  --gold: #9a7a3e;
  --gold-soft: #c4a36a;
  --rule: #c9b896;
  --spine-w: 56px;
  --col: 1080px;
  --measure: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Han Serif SC", "Noto Serif SC", "Source Han Serif CN", "Songti SC", SimSun, "STSong", serif;
  font-size: 18px;
  line-height: 1.85;
  padding-left: var(--spine-w);
}

a {
  color: var(--navy);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--gold);
}

img {
  max-width: 100%;
  height: auto;
}

/* Book spine */
.spine {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--spine-w);
  background: var(--navy);
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 0 22px;
}

.spine-cap,
.spine-foot {
  width: 18px;
  height: 6px;
  background: var(--gold);
  flex-shrink: 0;
}

.spine-title {
  writing-mode: vertical-rl;
  color: var(--paper);
  letter-spacing: 0.42em;
  font-size: 13px;
  font-weight: 600;
  margin: 28px 0 auto;
}

.spine-year {
  writing-mode: vertical-rl;
  color: var(--gold-soft);
  font-size: 11px;
  letter-spacing: 0.28em;
  margin-bottom: 16px;
}

/* Skip */
.skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip:focus {
  left: calc(var(--spine-w) + 16px);
  top: 12px;
  background: var(--navy);
  color: var(--paper);
  padding: 8px 14px;
  z-index: 50;
}

/* Shell */
.sheet {
  width: min(var(--col), calc(100% - 48px));
  margin: 0 auto;
}

/* Header / masthead */
.masthead {
  border-bottom: 3px double var(--navy);
  padding: 22px 0 16px;
  background: linear-gradient(180deg, var(--paper-deep) 0%, var(--paper) 70%);
}

.masthead-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: none;
  margin-bottom: 10px;
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand-mark {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--navy);
}

.brand-tag {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--navy);
  background: transparent;
  color: var(--navy);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 0.12em;
  cursor: pointer;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px 22px;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 15px;
  letter-spacing: 0.08em;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--navy);
  border-bottom-color: var(--gold);
}

/* Hero / chapter open */
.hero {
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--rule);
}

.kicker {
  display: inline-block;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.28em;
  font-weight: 600;
  margin: 0 0 12px;
}

.hero h1,
.article-head h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.35;
  color: var(--navy);
  margin: 0 0 22px;
  font-weight: 700;
}

.lede {
  font-size: 19px;
  color: var(--ink-soft);
  max-width: var(--measure);
}

.lede p:first-of-type::first-letter {
  float: left;
  font-size: 3.1em;
  line-height: 0.82;
  padding: 8px 10px 0 0;
  color: var(--navy);
  font-weight: 700;
}

.hero-actions,
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  margin-top: 26px;
}

.btn {
  display: inline-block;
  padding: 10px 22px;
  text-decoration: none;
  letter-spacing: 0.08em;
  font-size: 15px;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--paper);
}

.btn:hover {
  background: var(--navy-deep);
  color: var(--paper);
}

.btn-ghost {
  background: transparent;
  color: var(--navy);
}

.btn-ghost:hover {
  background: var(--paper-deep);
  color: var(--navy);
}

.btn-gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--paper);
}

.btn-gold:hover {
  background: #7f6430;
  color: var(--paper);
}

/* Chapters */
.chapter {
  padding: 42px 0 8px;
  border-bottom: 1px solid var(--rule);
}

.chapter:last-of-type {
  border-bottom: none;
}

.chapter h2 {
  font-size: 26px;
  line-height: 1.4;
  color: var(--navy);
  margin: 0 0 18px;
  max-width: 46rem;
}

.chapter h3 {
  font-size: 19px;
  color: var(--navy-deep);
  margin: 28px 0 10px;
}

.chapter p,
.chapter li {
  color: var(--ink);
  max-width: var(--measure);
}

.chapter p + p {
  margin-top: 0.9em;
}

.chapter ul,
.chapter ol {
  max-width: var(--measure);
  padding-left: 1.4em;
}

.chapter li + li {
  margin-top: 0.45em;
}

.folio {
  margin: 28px 0 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

/* Platform lines — not a card grid */
.platform-list {
  list-style: none;
  padding: 0;
  margin: 20px 0;
  max-width: var(--measure);
  border-top: 1px solid var(--rule);
}

.platform-list li {
  display: grid;
  grid-template-columns: 7.5em 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  max-width: none;
}

.platform-list strong {
  color: var(--navy);
  letter-spacing: 0.06em;
}

.note {
  border-left: 3px solid var(--gold);
  padding: 4px 0 4px 16px;
  color: var(--ink-soft);
  max-width: var(--measure);
}

/* Reviews as journal notes */
.notes {
  margin: 18px 0 8px;
}

.note-block {
  margin: 0 0 22px;
  padding: 0 0 18px 20px;
  border-left: 2px solid var(--navy);
  max-width: var(--measure);
}

.note-block h3 {
  margin-top: 0;
  font-size: 17px;
}

.note-meta {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.12em;
  margin: 0 0 8px;
}

/* FAQ */
.faq-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  max-width: 48rem;
}

.faq-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
  max-width: none;
}

.faq-list h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

/* Long article */
.article {
  padding: 36px 0 48px;
}

.article-head {
  padding-bottom: 20px;
  margin-bottom: 8px;
  border-bottom: 3px double var(--gold);
}

.mid-cta {
  margin: 32px 0;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

/* Footer */
.site-footer {
  margin-top: 48px;
  background: var(--navy);
  color: var(--paper);
  padding: 36px 0 28px;
}

.site-footer a {
  color: var(--gold-soft);
}

.site-footer a:hover {
  color: var(--paper);
}

.footer-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 0;
  margin: 0 0 18px;
}

.footer-nav a {
  text-decoration: none;
  letter-spacing: 0.08em;
}

.footer-nav a.active {
  border-bottom: 1px solid var(--gold);
}

.footer-warn,
.footer-copy {
  max-width: 52rem;
  font-size: 14px;
  line-height: 1.75;
  color: #e4dccb;
}

.footer-copy {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(154, 122, 62, 0.45);
}

@media (max-width: 800px) {
  :root {
    --spine-w: 36px;
  }

  body {
    font-size: 16px;
  }

  .spine-title,
  .spine-year {
    font-size: 10px;
  }

  .brand-row {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    width: 100%;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    padding: 8px 0 4px;
  }

  .platform-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .lede p:first-of-type::first-letter {
    font-size: 2.4em;
  }
}

/* four official platform downloads */
.plat-dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 1rem 0 0.4rem;
  max-width: 36rem;
}
.plat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.72rem 0.9rem;
  text-decoration: none;
  font-weight: 650;
  line-height: 1.3;
  border-radius: 8px;
}
.plat-win { background: #1e3a6e; color: #fff; }
.plat-mac { background: #2c3338; color: #fff; }
.plat-and { background: #2e7d4f; color: #fff; }
.plat-ios { background: #4c3bb5; color: #fff; }
.plat-btn:hover { filter: brightness(1.08); color: #fff; }
.plat-btn.is-loading,
a.is-loading {
  opacity: 0.62;
  pointer-events: none;
}
.plat-more {
  display: inline-flex;
  align-items: center;
  margin: 0.35rem 0.4rem 0.35rem 0;
  font-weight: 650;
}
@media (max-width: 560px) {
  .plat-dl { grid-template-columns: 1fr; }
}