@charset "UTF-8";

:root {
  --paper: #F3E9D2;
  --paper-2: #EFE3C8;
  --page: #FBF5E4;
  --ink: #22201C;
  --muted: #6E6455;
  --line: #D8C9A8;
  --line-2: #C6B48D;
  --accent: #8C5B2F;
  --shell: 1180px;
  --header-height: 68px;
  --serif: "Songti SC", "SimSun", "Noto Serif SC", Georgia, serif;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

* { 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: 1.7;
}
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(140, 91, 47, .55); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: block;
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 2.4px;
  line-height: 1.5;
}
.eyebrow::before { margin-right: 8px; content: "▍"; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line-2);
  background: rgba(243, 233, 210, .97);
  backdrop-filter: blur(8px);
}
.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: 1px; }
.brand img { width: 34px; height: 34px; border: 1px solid var(--line-2); border-radius: 3px; object-fit: contain; background: var(--page); }
.brand-tag {
  padding: 1px 5px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 8.5px;
  font-style: normal;
  letter-spacing: .8px;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 2vw, 26px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; color: #5E5344; font-size: 13px; font-weight: 700; border-bottom: 1px solid transparent; }
.primary-nav a:hover { border-bottom-color: var(--accent); color: var(--ink); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 19px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  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: 40px; height: 40px; padding: 0; border: 1px solid var(--line-2); border-radius: 2px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 17px; height: 2px; margin: 5px auto; background: var(--ink); }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* hero */
.hero {
  position: relative;
  padding: 42px 0 56px;
  border-bottom: 1px solid var(--line-2);
  background:
    radial-gradient(600px 340px at 12% 0%, rgba(255, 255, 255, .55), transparent 70%),
    linear-gradient(180deg, #F6EDD8 0%, var(--paper) 82%);
}
.hero-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 246px;
  align-items: center;
  gap: clamp(22px, 4vw, 58px);
}
.hero-copy { min-width: 0; }
.hero-kicker { margin: 0 0 10px; color: var(--accent); font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: 1.8px; }
.hero h1 { margin: 0; font-family: var(--serif); font-size: clamp(54px, 7.6vw, 96px); font-weight: 700; letter-spacing: .02em; line-height: 1.04; }
.hero-subtitle {
  display: inline-block;
  margin: 16px 0 0;
  padding: 3px 12px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: var(--serif);
  font-size: clamp(17px, 1.9vw, 22px);
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.6;
}
.hero-lead { max-width: 560px; margin: 14px 0 0; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin-top: 24px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  gap: 12px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  transition: background .18s ease, color .18s ease;
}
.button svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.button-primary { background: var(--ink); color: var(--paper); }
.button-primary:hover { background: #3A362E; }
.button-large { min-height: 54px; padding: 0 30px; font-size: 15px; }
.text-link { color: var(--accent); border-bottom: 1px solid var(--line-2); font-size: 13px; font-weight: 700; }
.text-link span { margin-left: 4px; }

.hero-cover {
  position: relative;
  margin: 0;
  padding: 10px 10px 0 14px;
  border: 1px solid var(--line-2);
  background: var(--page);
  box-shadow: 10px 12px 0 rgba(140, 91, 47, .14);
  transform: rotate(-1.6deg);
}
.hero-cover::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 4px;
  width: 6px;
  content: "";
  background: linear-gradient(90deg, rgba(34, 32, 28, .16), transparent);
}
.hero-cover img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; }
.hero-cover figcaption { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding: 8px 2px 9px; }
.hero-cover figcaption b { font-family: var(--serif); font-size: 13px; }
.hero-cover figcaption span { color: var(--muted); font-family: var(--mono); font-size: 9.5px; }

/* open book */
.book {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 44px;
  border: 1px solid var(--line-2);
  border-radius: 3px 10px 10px 3px;
  background: var(--page);
  box-shadow: 0 22px 40px rgba(80, 62, 34, .18), inset 0 0 0 1px rgba(255, 255, 255, .6);
}
.book::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  z-index: 2;
  width: 64px;
  margin-left: -32px;
  content: "";
  background: linear-gradient(90deg, rgba(120, 96, 58, 0) 0%, rgba(120, 96, 58, .16) 44%, rgba(120, 96, 58, .3) 50%, rgba(120, 96, 58, .16) 56%, rgba(120, 96, 58, 0) 100%);
  pointer-events: none;
}
.book::after {
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 26px;
  content: "";
  background: linear-gradient(135deg, var(--paper) 50%, rgba(140, 91, 47, .16) 51%);
}
.book-page { position: relative; padding: 30px 34px 26px; min-width: 0; }
.book-left { padding-right: 44px; }
.book-right { padding-left: 44px; }
.page-label { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding-bottom: 9px; margin: 0 0 14px; border-bottom: 1px solid var(--line); font-family: var(--serif); font-size: 13px; font-weight: 700; letter-spacing: 1px; }
.page-label span { color: var(--muted); font-family: var(--mono); font-size: 9.5px; font-weight: 400; letter-spacing: .6px; }
.toc-list { padding: 0; margin: 0; list-style: none; counter-reset: toc; }
.toc-list li { padding: 6px 0 6px 2px; border-bottom: 1px dotted #DFD2B4; color: #3B362E; font-family: var(--serif); font-size: 13.5px; }
.toc-list li:last-child { border-bottom: 0; }
.toc-list .is-last { color: var(--accent); font-weight: 700; }
.page-foot { margin: 14px 0 0; color: var(--muted); font-family: var(--mono); font-size: 10px; }
.book-text { margin: 0 0 11px; color: #35312A; font-family: var(--serif); font-size: 14px; line-height: 2; text-align: justify; text-indent: 2em; }
.page-meta { margin: 16px 0 0; padding-top: 10px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 9.5px; }

/* features: 2x2 horizontal cards */
.features { padding: 64px 0 70px; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-family: var(--serif); font-size: clamp(23px, 2.6vw, 32px); font-weight: 700; letter-spacing: .5px; line-height: 1.4; }
.section-heading > p:last-child { max-width: 620px; margin: 9px 0 0; color: var(--muted); font-size: 13.5px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(190px, 300px); align-items: end; gap: 24px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.feature-item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
  background: var(--page);
}
.feature-item > span { color: #B9A57E; font-family: var(--serif); font-size: 30px; font-weight: 700; line-height: 1; }
.feature-item h3 { margin: 0 0 5px; font-size: 16.5px; font-weight: 700; }
.feature-item p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.85; }

/* shots: horizontal rows */
.shots { padding: 66px 0 72px; }
.shot-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.shot-row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 12px 14px 12px 12px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--page);
  transition: transform .2s ease, box-shadow .2s ease;
}
.shot-row:hover { transform: translateX(3px); box-shadow: -3px 3px 0 rgba(140, 91, 47, .12); }
.shot-row img { width: 100%; height: auto; aspect-ratio: 1 / 2; object-fit: cover; object-position: center 4%; border: 1px solid var(--line-2); border-radius: 2px; }
.shot-row figcaption { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.shot-row figcaption b { font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1px; color: var(--accent); }
.shot-row figcaption span { color: #4A443A; font-size: 13px; line-height: 1.85; }

/* faq: single column */
.faq { padding: 64px 0 70px; border-top: 1px solid var(--line); background: var(--paper-2); }
.faq .section-heading { max-width: 720px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line-2); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 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: 16px; font-weight: 700; }
.faq-list summary i { position: relative; flex: none; width: 22px; height: 22px; border: 1px solid var(--line-2); border-radius: 50%; background: var(--page); }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; height: 1px; content: ""; background: var(--accent); 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 { max-width: 900px; padding: 0 26px 16px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.9; }

/* reviews: three columns */
.reviews { padding: 66px 0 72px; }
.review-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 17px 18px; border: 1px solid var(--line); border-radius: 2px; background: var(--page); }
.review-meta { display: flex; flex-direction: column; gap: 1px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dotted var(--line-2); }
.review-meta b { font-size: 13px; font-weight: 700; }
.review-meta time { color: #94886F; font-family: var(--mono); font-size: 9.5px; }
.review-card p { margin: 0; color: #4A443A; font-size: 12.5px; line-height: 1.85; }

/* steps: watermark numbers */
.steps { padding: 62px 0 68px; border-top: 1px solid var(--line); background: var(--paper-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; padding: 0; margin: 0; list-style: none; }
.step-list li { position: relative; padding-top: 16px; border-top: 2px solid var(--ink); }
.step-list span {
  position: absolute;
  top: -8px;
  right: 0;
  color: rgba(140, 91, 47, .16);
  font-family: var(--serif);
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  pointer-events: none;
}
.step-list h3 { margin: 0 0 5px; font-family: var(--serif); font-size: 18px; font-weight: 700; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.85; }

/* download: framed card with fold */
.download { padding: 0 0 56px; }
.download-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 26px;
  max-width: 940px;
  padding: 38px clamp(22px, 4vw, 46px);
  margin: 0 auto;
  border: 1px solid var(--line-2);
  background:
    linear-gradient(135deg, transparent 46%, rgba(140, 91, 47, .1) 50%, transparent 54%) top right / 34px 34px no-repeat,
    var(--page);
  box-shadow: 8px 8px 0 rgba(140, 91, 47, .1);
}
.download-copy > p { max-width: 460px; margin: 9px 0 0; color: var(--muted); font-size: 13.5px; }
.download-side { display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px 14px; padding: 0; margin: 0; list-style: none; }
.download-notes li { color: var(--muted); font-family: var(--mono); font-size: 10px; }
.download-notes li::before { margin-right: 5px; content: "—"; }

/* footer */
.site-footer { padding: 38px 0 46px; border-top: 1px solid var(--line-2); background: var(--paper); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 40px; align-items: start; }
.footer-brand strong { font-family: var(--serif); font-size: 18px; font-weight: 700; letter-spacing: 1px; }
.footer-brand p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: #5E5344; font-size: 12px; }
.footer-nav a:hover { color: var(--accent); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: var(--muted); }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #8B7F68; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .hero-top { grid-template-columns: minmax(0, 1fr) 210px; }
  .book-page { padding: 24px 24px 22px; }
  .book-left { padding-right: 30px; }
  .book-right { padding-left: 30px; }
  .review-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-list { grid-template-columns: 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: 1px solid var(--line-2);
    background: var(--paper);
    box-shadow: 0 12px 20px rgba(80, 62, 34, .16);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 11px 0; border-bottom: 1px solid var(--line); }
  .hero-top { grid-template-columns: 1fr; gap: 24px; }
  .hero-cover { width: 200px; margin-left: 8px; }
  .book { grid-template-columns: 1fr; }
  .book::before { display: none; }
  .book-left { padding-bottom: 6px; border-bottom: 1px solid var(--line); }
  .book-right { padding-top: 22px; }
  .feature-grid { grid-template-columns: 1fr; }
  .download-inner { grid-template-columns: 1fr; }
  .download-side { align-items: flex-start; }
  .download-notes { justify-content: flex-start; }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 30px); }
  .hero { padding: 30px 0 44px; }
  .hero h1 { font-size: clamp(46px, 14vw, 62px); }
  .hero-subtitle { font-size: 16px; letter-spacing: .5px; }
  .hero-cover { width: 168px; }
  .book-page { padding: 20px 18px 18px; }
  .book-left { padding-right: 18px; }
  .book-right { padding-left: 18px; }
  .book-text { font-size: 13px; }
  .shot-row { grid-template-columns: 92px minmax(0, 1fr); gap: 12px; padding: 10px; }
  .shot-row figcaption span { font-size: 12px; }
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; gap: 22px; }
  .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: 380px) {
  .brand { font-size: 18px; gap: 6px; }
  .brand img { width: 26px; height: 26px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 33px; padding: 0 9px; font-size: 11px; }
  .menu-toggle { width: 33px; height: 33px; }
  .hero h1 { font-size: 42px; }
  .button { width: 100%; }
  .download-side { width: 100%; }
  .toc-list li { font-size: 12.5px; }
}