@charset "UTF-8";

:root {
  --paper: #F0E6D2;
  --paper-2: #E7DAC0;
  --sheet: #FBF6EA;
  --ink: #4A3B2A;
  --ink-2: #2F2519;
  --muted: #7C6A52;
  --rule: #C9B893;
  --rule-2: #A98F63;
  --shell: 1140px;
  --header-height: 70px;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
  --serif: "Songti SC", "Noto Serif SC", "SimSun", "Microsoft YaHei", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
svg { display: block; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid rgba(74, 59, 42, .45); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 11px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2.6px;
  line-height: 1.5;
}
.eyebrow::before, .eyebrow::after { height: 1px; width: 16px; content: ""; background: var(--rule-2); }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 3px double var(--rule-2);
  background: rgba(240, 230, 210, .97);
}
.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), var(--shell));
  min-height: var(--header-height);
  margin: 0 auto;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 9px; font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: 1.5px; }
.brand img { width: 34px; height: 34px; border: 1px solid var(--rule-2); border-radius: 2px; object-fit: contain; background: var(--sheet); }
.brand-tag {
  padding: 0 5px;
  border: 1px solid var(--rule-2);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 8.5px;
  font-style: normal;
  font-weight: 400;
  letter-spacing: 1px;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 2vw, 22px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; color: var(--muted); font-size: 12.5px; font-weight: 700; letter-spacing: .5px; }
.primary-nav a:hover { color: var(--ink-2); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--ink); }
.menu-toggle { display: none; width: 38px; height: 38px; padding: 0; border: 1px solid var(--rule-2); background: var(--sheet); cursor: pointer; }
.menu-toggle span { display: block; width: 16px; height: 1.5px; margin: 5px auto; background: var(--ink); }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* hero paper */
.hero { padding: 26px 0 40px; }
.paper {
  padding: clamp(16px, 3vw, 30px) clamp(16px, 3vw, 34px) 22px;
  border: 1px solid var(--rule-2);
  outline: 4px double var(--rule-2);
  outline-offset: 4px;
  background:
    repeating-linear-gradient(0deg, rgba(169, 143, 99, .05) 0 1px, transparent 1px 4px),
    var(--sheet);
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px 14px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .6px;
}
.paper h1 {
  padding: 8px 0 6px;
  margin: 0;
  border-bottom: 3px double var(--ink);
  font-family: var(--serif);
  font-size: clamp(44px, 7.4vw, 86px);
  font-weight: 700;
  letter-spacing: clamp(2px, .9vw, 14px);
  line-height: 1.12;
  text-align: center;
  text-indent: clamp(2px, .9vw, 14px);
}
.headline {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
  align-items: start;
  gap: clamp(18px, 3vw, 36px);
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--rule);
}
.headline-copy { min-width: 0; }
.kicker { margin: 0 0 8px; color: var(--muted); font-family: var(--mono); font-size: 9.5px; letter-spacing: 2px; }
.hero-subtitle {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(21px, 2.8vw, 33px);
  font-weight: 700;
  letter-spacing: 1.5px;
  line-height: 1.34;
}
.hero-lead { max-width: 520px; margin: 10px 0 18px; color: var(--muted); font-size: 13.5px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  gap: 11px;
  padding: 0 24px;
  border: 1px solid var(--ink);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .5px;
  transition: background .18s ease, color .18s ease;
}
.button svg { width: 17px; height: 17px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.button-primary { background: var(--ink); color: var(--sheet); }
.button-primary:hover { background: var(--ink-2); }
.button-large { min-height: 48px; padding: 0 30px; font-size: 14px; }
.lead-photo { margin: 0; padding: 6px; border: 1px solid var(--rule); background: #fff; }
.lead-photo img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; object-position: center 8%; filter: sepia(.28) contrast(.98); }
.lead-photo figcaption { padding: 6px 2px 2px; color: var(--muted); font-family: var(--mono); font-size: 9px; letter-spacing: .4px; }

.book-columns { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; padding: 16px 0 2px; }
.book-col { padding: 0 18px; border-left: 1px dotted var(--rule-2); }
.book-col:first-child { padding-left: 0; border-left: 0; }
.book-col:last-child { padding-right: 0; }
.col-title {
  padding-bottom: 5px;
  margin: 0 0 7px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
}
.book-col ul { padding: 0; margin: 0; list-style: none; }
.book-col li { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding: 3px 0; border-bottom: 1px dotted #DCCBA8; font-size: 12.5px; }
.book-col i { color: var(--muted); font-family: var(--mono); font-size: 9.5px; font-style: normal; }
.year-scale {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
  padding-top: 10px;
  margin-top: 14px;
  border-top: 3px double var(--ink);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .5px;
}
.year-scale span { position: relative; padding-top: 8px; }
.year-scale span::before { position: absolute; top: 0; left: 50%; width: 1px; height: 5px; content: ""; background: var(--rule-2); }

/* features: single column rows */
.features { padding: 56px 0 58px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: var(--sheet); }
.section-heading { margin-bottom: 24px; }
.section-heading h2, .download h2 { margin: 0; font-family: var(--serif); font-size: clamp(22px, 2.5vw, 30px); font-weight: 700; letter-spacing: 1px; line-height: 1.4; }
.section-heading > p:last-child { max-width: 640px; margin: 8px 0 0; color: var(--muted); font-size: 13px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 270px); align-items: end; gap: 22px; }
.section-heading-split > p:last-child { margin: 0 0 3px; }
.feature-list { padding: 0; margin: 0; border-top: 1px solid var(--ink); list-style: none; }
.feature-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 150px) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 13px 4px;
  border-bottom: 1px dotted var(--rule-2);
}
.feature-no { color: var(--rule-2); font-family: var(--mono); font-size: 13px; font-weight: 700; letter-spacing: 1px; }
.feature-list h3 { margin: 0; font-family: var(--serif); font-size: 16px; font-weight: 700; letter-spacing: 1px; }
.feature-list p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.85; }

/* shots: three proof columns */
.shots { padding: 56px 0 60px; background: var(--paper-2); }
.proof-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.proof { margin: 0; padding: 8px 8px 10px; border: 1px solid var(--rule-2); background: var(--sheet); }
.proof-no { padding: 0 2px 6px; margin: 0; border-bottom: 1px solid var(--rule); color: var(--muted); font-family: var(--mono); font-size: 9.5px; letter-spacing: 1.6px; }
.proof img { width: 100%; height: auto; aspect-ratio: 3 / 5; object-fit: cover; object-position: center 8%; margin: 8px 0 0; filter: sepia(.32) contrast(.96); }
.proof figcaption { padding-top: 7px; color: var(--muted); font-size: 11.5px; line-height: 1.7; }

/* faq: two columns */
.faq { padding: 56px 0 60px; }
.faq-layout { display: block; }
.faq-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 34px; }
.faq-list details { border-bottom: 1px dotted var(--rule-2); }
.faq-list summary { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; padding: 13px 0; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-family: var(--serif); font-size: 14.5px; font-weight: 700; line-height: 1.6; }
.faq-list summary i { position: relative; flex: none; width: 14px; height: 14px; margin-top: 4px; }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 10px; height: 1px; content: ""; background: var(--ink); transform: translate(-50%, -50%); }
.faq-list summary i::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .2s ease; }
.faq-list details[open] summary i::after { transform: translate(-50%, -50%) rotate(0deg); }
.faq-list details p { padding: 0 22px 13px 0; margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.9; }

/* reviews: three columns with rules */
.reviews { padding: 54px 0 58px; border-top: 1px solid var(--rule); background: var(--sheet); }
.review-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 28px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.review-card { padding: 12px 0 14px; border-bottom: 1px dotted var(--rule-2); break-inside: avoid; }
.review-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; margin-bottom: 4px; }
.review-meta b { font-family: var(--serif); font-size: 13.5px; font-weight: 700; letter-spacing: 1px; }
.review-meta time { color: var(--rule-2); font-family: var(--mono); font-size: 9px; }
.review-card p { margin: 0; color: #5E4E3A; font-size: 12.5px; line-height: 1.85; }

/* steps: vertical timeline */
.steps { padding: 54px 0 58px; background: var(--paper-2); }
.step-list { position: relative; padding: 0 0 0 26px; margin: 0; border-left: 1px solid var(--rule-2); list-style: none; }
.step-list li { position: relative; padding: 0 0 18px; }
.step-list li:last-child { padding-bottom: 0; }
.step-list li::before {
  position: absolute;
  top: 8px;
  left: -30px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--rule-2);
  border-radius: 50%;
  background: var(--sheet);
  content: "";
}
.step-list span { display: block; color: var(--rule-2); font-family: var(--mono); font-size: 10px; letter-spacing: 1.4px; }
.step-list h3 { margin: 1px 0 3px; font-family: var(--serif); font-size: 16px; font-weight: 700; letter-spacing: 1px; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.5px; }

/* download: double-rule frame */
.download { padding: 26px 0 46px; }
.download-inner {
  padding: clamp(26px, 4vw, 44px) clamp(20px, 4vw, 40px);
  border: 1px solid var(--rule-2);
  outline: 4px double var(--rule-2);
  outline-offset: 4px;
  background: var(--sheet);
  text-align: center;
}
.download .eyebrow { justify-content: center; }
.download-inner > p { max-width: 460px; margin: 9px auto 18px; color: var(--muted); font-size: 13px; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: center; gap: 5px 16px; padding: 0; margin: 18px 0 0; list-style: none; }
.download-notes li { color: var(--muted); font-family: var(--mono); font-size: 9.5px; letter-spacing: .4px; }
.download-notes li::before { margin-right: 5px; content: "§"; color: var(--rule-2); }

/* footer */
.site-footer { padding: 32px 0 42px; border-top: 3px double var(--rule-2); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 40px; align-items: start; }
.footer-brand strong { font-family: var(--serif); font-size: 17px; font-weight: 700; letter-spacing: 2px; }
.footer-brand p { margin: 2px 0 0; color: var(--muted); font-size: 11.5px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 7px 18px; }
.footer-nav a { color: var(--muted); font-size: 11.5px; }
.footer-nav a:hover { color: var(--ink); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 7px 16px; margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 11.5px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: var(--muted); }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #8B7B62; font-size: 11px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .faq-list { grid-template-columns: 1fr; }
  .review-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 6px 24px 14px;
    border-bottom: 3px double var(--rule-2);
    background: var(--paper);
    box-shadow: 0 12px 18px rgba(74, 59, 42, .16);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 10px 0; border-bottom: 1px dotted var(--rule); }
  .headline { grid-template-columns: 1fr; }
  .lead-photo { max-width: 260px; }
  .proof-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
  .feature-list li { grid-template-columns: 40px minmax(0, 1fr); }
  .feature-list p { grid-column: 2; }
}
@media (max-width: 720px) {
  .book-columns { grid-template-columns: 1fr; gap: 12px; padding-bottom: 0; }
  .book-col, .book-col:last-child { padding: 0 0 4px; border-left: 0; border-bottom: 1px dotted var(--rule-2); }
  .book-col:last-child { border-bottom: 0; }
  .year-scale { overflow-x: auto; justify-content: flex-start; gap: 26px; padding-bottom: 4px; }
  .proof-grid { grid-template-columns: 1fr; }
  .proof { display: grid; grid-template-columns: 96px minmax(0, 1fr); align-items: center; gap: 12px; }
  .proof-no { grid-column: 1; border-bottom: 0; padding: 0; }
  .proof img { grid-row: 2; grid-column: 1; margin: 0; aspect-ratio: 3 / 5; }
  .proof figcaption { grid-row: 2; grid-column: 2; padding: 0; }
  .review-list { grid-template-columns: 1fr; }
  .section-heading-split { grid-template-columns: 1fr; gap: 8px; }
  .section-heading-split > p:last-child { margin: 0; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .page-shell, .nav-shell { width: calc(100% - 28px); }
  .brand { font-size: 17px; letter-spacing: 1px; gap: 6px; }
  .brand img { width: 28px; height: 28px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 32px; padding: 0 10px; font-size: 11px; }
  .menu-toggle { width: 32px; height: 32px; }
  .paper h1 { font-size: 38px; letter-spacing: 4px; text-indent: 4px; }
  .masthead { font-size: 9px; }
  .button, .button-large { width: 100%; }
  .lead-photo { max-width: 100%; }
  .proof { grid-template-columns: 78px minmax(0, 1fr); }
  .download-notes { gap: 4px 10px; }
}