/* QuickQ official download handbook — book-spine timeline */
:root {
  --paper: #f6f1e8;
  --paper-deep: #efe6d6;
  --paper-edge: #e4d7c0;
  --ink: #1c1914;
  --ink-soft: #3d382e;
  --navy: #1a365d;
  --navy-mid: #234574;
  --navy-soft: #2c5282;
  --gold: #b8860b;
  --gold-bright: #d4a017;
  --gold-pale: #f3e6c0;
  --rule: #c9b48a;
  --danger: #7a2e1b;
  --ok: #2d4a32;
  --spine-w: 56px;
  --folio-max: 920px;
  --header-h: 72px;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", "Georgia", "Times New Roman", serif;
  --sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    repeating-linear-gradient(
      90deg,
      rgba(26, 54, 93, 0.015) 0,
      rgba(26, 54, 93, 0.015) 1px,
      transparent 1px,
      transparent 28px
    ),
    radial-gradient(ellipse at 12% 0%, rgba(184, 134, 11, 0.08), transparent 42%),
    var(--paper);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.88;
  letter-spacing: 0.02em;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--navy);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip-link:focus {
  left: 16px;
  top: 12px;
  z-index: 40;
  background: var(--navy);
  color: var(--paper);
  padding: 8px 14px;
}

/* ----- book frame + navy spine ----- */
.book-frame {
  display: flex;
  min-height: 100vh;
}

.book-spine {
  position: sticky;
  top: 0;
  align-self: flex-start;
  width: var(--spine-w);
  min-height: 100vh;
  height: 100vh;
  background:
    linear-gradient(90deg, #12243f 0%, var(--navy) 38%, #23406b 100%);
  box-shadow: 4px 0 0 rgba(184, 134, 11, 0.45), 8px 0 18px rgba(26, 54, 93, 0.18);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 24px;
  z-index: 8;
}

.spine-rings {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.spine-ring {
  width: 14px;
  height: 14px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #f3e6c0, #8a6a12);
}

.spine-title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: #f6f1e8;
  font-size: 15px;
  letter-spacing: 0.42em;
  font-weight: 600;
}

.spine-gold-rule {
  width: 2px;
  height: 72px;
  background: linear-gradient(to bottom, transparent, var(--gold), transparent);
}

.spine-code {
  writing-mode: vertical-rl;
  color: var(--gold-bright);
  font-size: 11px;
  letter-spacing: 0.38em;
  font-family: var(--sans);
}

.folio {
  flex: 1;
  min-width: 0;
  padding: 0 28px 48px;
}

.folio-inner {
  max-width: var(--folio-max);
  margin: 0 auto;
}

/* ----- header ----- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--header-h);
  padding: 14px 0 12px;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: rgba(246, 241, 232, 0.94);
  z-index: 6;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
  text-decoration: none;
}

.brand:hover {
  color: var(--navy-mid);
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 4px;
}

.site-nav a {
  display: inline-block;
  padding: 6px 12px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  font-size: 15px;
}

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

.site-nav a.active {
  color: var(--navy);
  border-bottom-color: var(--gold);
  font-weight: 700;
}

/* ----- title page / hero ----- */
.title-page {
  padding: 42px 0 36px;
  border-bottom: 3px double var(--navy);
  margin-bottom: 8px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--gold);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.36em;
  text-transform: none;
}

.title-ornament {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 8px 0 18px;
  color: var(--gold);
}

.title-ornament span {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.title-ornament svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.title-page h1 {
  margin: 0 0 18px;
  color: var(--navy);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.35;
  font-weight: 700;
}

.lead,
.chapter-body p,
.faq-list dd,
.oral-card p,
.note p,
.colophon p,
.disclaimer {
  text-align: justify;
}

.lead {
  margin: 0 0 14px;
  color: var(--ink-soft);
}

.disclaimer {
  margin: 20px 0;
  padding: 14px 16px 14px 18px;
  border-left: 4px solid var(--gold);
  background: var(--gold-pale);
  color: var(--ink);
  font-size: 15px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: var(--navy);
  color: #f6f1e8;
  text-decoration: none;
  border: 1px solid var(--navy);
  box-shadow: 3px 3px 0 var(--gold);
  font-family: var(--serif);
  font-size: 16px;
}

.cta:hover {
  background: var(--navy-mid);
  color: #fff;
  box-shadow: 4px 4px 0 var(--gold-bright);
}

.cta-secondary {
  background: transparent;
  color: var(--navy);
  box-shadow: none;
}

.cta-secondary:hover {
  background: var(--paper-deep);
  color: var(--navy);
  box-shadow: 3px 3px 0 var(--gold);
}

.cta-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 260px;
  padding: 16px 36px;
  font-size: 18px;
  font-weight: 700;
}

.cta svg {
  width: 18px;
  height: 18px;
}

/* ----- timeline chapters ----- */
.timeline {
  position: relative;
  padding: 12px 0 8px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(to bottom, var(--navy), var(--gold), var(--navy));
}

.chapter {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 22px;
  padding: 28px 0 8px;
}

.chapter-mark {
  position: relative;
  z-index: 1;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--navy);
  background: var(--paper);
  color: var(--navy);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px var(--gold);
}

.chapter-body {
  min-width: 0;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--rule);
}

.chapter:last-child .chapter-body {
  border-bottom: none;
}

.chapter-body h2 {
  margin: 6px 0 14px;
  color: var(--navy);
  font-size: 22px;
  line-height: 1.4;
}

.chapter-body h3 {
  margin: 20px 0 10px;
  color: var(--navy-soft);
  font-size: 18px;
  font-weight: 700;
}

.chapter-body p {
  margin: 0 0 14px;
}

.chapter-body ul,
.chapter-body ol {
  margin: 0 0 16px;
  padding-left: 1.4em;
}

.chapter-body li {
  margin-bottom: 8px;
}

.pull {
  margin: 16px 0 20px;
  padding: 12px 18px;
  border-top: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  color: var(--navy);
  font-style: italic;
}

/* ----- oral review cards ----- */
.oral-grid {
  display: grid;
  gap: 14px;
  margin: 16px 0 20px;
}

.oral-card {
  background: var(--paper-deep);
  border: 1px solid var(--paper-edge);
  padding: 16px 18px 8px;
  position: relative;
}

.oral-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--navy);
}

.oral-label {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.oral-card p {
  margin: 0 0 12px;
  font-size: 16px;
}

/* ----- ledger table ----- */
.table-wrap {
  overflow-x: auto;
  margin: 16px 0 20px;
  border: 1px solid var(--navy);
}

.ledger {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  background: #fffdf8;
}

.ledger caption {
  caption-side: top;
  text-align: left;
  padding: 8px 10px;
  background: var(--navy);
  color: #f6f1e8;
  font-weight: 600;
}

.ledger th,
.ledger td {
  border: 1px solid var(--paper-edge);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.ledger th {
  background: #e8eef6;
  color: var(--navy);
  font-weight: 700;
}

.ledger tr:nth-child(even) td {
  background: #fbf7ef;
}

/* ----- notes / callouts ----- */
.note {
  margin: 16px 0 20px;
  padding: 14px 16px 4px;
  background: #fffdf8;
  border: 1px solid var(--rule);
}

.note-title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--danger);
}

.note p {
  margin: 0 0 12px;
  font-size: 15px;
}

.checklist {
  list-style: none;
  margin: 12px 0 18px;
  padding: 0;
}

.checklist li {
  position: relative;
  padding: 8px 10px 8px 36px;
  margin-bottom: 8px;
  background: #fffdf8;
  border: 1px solid var(--paper-edge);
}

.checklist li svg {
  position: absolute;
  left: 10px;
  top: 12px;
  width: 16px;
  height: 16px;
  color: var(--navy);
}

/* ----- FAQ ----- */
.faq-list {
  margin: 8px 0 0;
}

.faq-list dt {
  margin: 18px 0 8px;
  padding: 8px 12px;
  background: var(--navy);
  color: #f6f1e8;
  font-weight: 700;
}

.faq-list dd {
  margin: 0;
  padding: 12px 12px 4px;
  background: #fffdf8;
  border: 1px solid var(--paper-edge);
  border-top: none;
}

.faq-list dd p {
  margin: 0 0 12px;
}

/* ----- footer / colophon ----- */
.site-footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 3px double var(--navy);
}

.safety-box {
  padding: 14px 16px;
  background: #f3e8e4;
  border: 1px solid #d7b8ae;
  color: var(--danger);
  margin-bottom: 16px;
  font-size: 15px;
}

.colophon {
  color: var(--ink-soft);
  font-size: 14px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}

.footer-nav a {
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.footer-nav a:hover {
  border-bottom-color: var(--gold);
}

/* ----- helpers ----- */
.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
}

.icon-inline {
  width: 16px;
  height: 16px;
  vertical-align: -2px;
}

.steps {
  counter-reset: step;
  list-style: none;
  margin: 12px 0 18px;
  padding: 0;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 10px 12px 10px 48px;
  margin-bottom: 10px;
  background: #fffdf8;
  border: 1px solid var(--paper-edge);
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 10px;
  top: 12px;
  color: var(--gold);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 14px 0 18px;
}

.panel {
  padding: 14px 16px 4px;
  background: #fffdf8;
  border: 1px solid var(--paper-edge);
}

.panel h3 {
  margin-top: 0;
}

/* ----- responsive ----- */
@media (max-width: 860px) {
  .book-spine {
    width: 36px;
  }

  .spine-title,
  .spine-code {
    font-size: 10px;
    letter-spacing: 0.28em;
  }

  .spine-ring {
    width: 10px;
    height: 10px;
  }

  .folio {
    padding: 0 16px 36px;
  }

  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 16px;
  }

  .book-spine {
    display: none;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    position: static;
    padding-bottom: 10px;
  }

  .title-page {
    padding-top: 24px;
  }

  .title-page h1 {
    font-size: 24px;
  }

  .timeline::before {
    left: 17px;
  }

  .chapter {
    grid-template-columns: 36px 1fr;
    gap: 14px;
  }

  .chapter-mark {
    width: 36px;
    height: 36px;
    font-size: 11px;
    box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px var(--gold);
  }

  .cta,
  .cta-seal {
    width: 100%;
    justify-content: center;
  }

  .ledger th,
  .ledger td {
    font-size: 13px;
    padding: 8px;
  }
}

@media (min-width: 1200px) {
  .folio {
    padding-right: 48px;
  }

  .chapter-body h2 {
    font-size: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cta,
  .site-nav a,
  .brand {
    transition: none;
  }
}

.cta,
.site-nav a,
.brand,
.footer-nav a {
  transition: color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

/* print: keep paper handbook feel */
@media print {
  .book-spine,
  .site-nav,
  .cta-row,
  .skip-link {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .folio {
    padding: 0;
  }

  a {
    text-decoration: none;
    color: #000;
  }
}

/* decorative page number feel */
.chapter-body {
  background-image: linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), rgba(26, 54, 93, 0.04) calc(100% - 1px));
}

.hero-meta {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 13px;
  color: var(--ink-soft);
  font-family: var(--sans);
}

.hero-meta li {
  position: relative;
}

.hero-meta li + li::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--gold);
}

.end-mark {
  text-align: center;
  margin: 28px 0 8px;
  color: var(--gold);
  letter-spacing: 0.4em;
  font-size: 13px;
}

.toc {
  margin: 18px 0 0;
  padding: 14px 16px 8px;
  background: #fffdf8;
  border: 1px solid var(--paper-edge);
}

.toc-title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.toc ol {
  margin: 0 0 10px;
  padding-left: 1.3em;
}

.toc a {
  text-decoration: none;
}

.toc a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* platform download row */
.dl-platforms {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0.85rem 0 0;
}
.dl-platforms a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.55rem;
  padding: 0.4rem 0.55rem;
  text-align: center;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.25;
  border: 1px solid currentColor;
}
.dl-platforms a:hover {
  filter: brightness(1.06);
}
@media (max-width: 800px) {
  .dl-platforms { grid-template-columns: 1fr 1fr; }
}

.dl-platforms a { background: #1a365d; color: #f6f1e8; border-color: #b8860b; box-shadow: 2px 2px 0 #b8860b; }
.dl-platforms a:hover { color: #fff; }

.is-loading {
  pointer-events: none;
  opacity: 0.72;
}