@charset "UTF-8";

:root {
  --paper: #f7f1e4;
  --paper-2: #efe5d2;
  --panel: #fffaf0;
  --brown: #6b4a2f;
  --brown-soft: #a07a54;
  --pine: #3e6b57;
  --ink: #2b2119;
  --muted: #7c6a56;
  --line: #dccdb4;
  --shell: 1160px;
  --header-height: 70px;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 18px); }
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 var(--pine); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 13px;
  color: var(--pine);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.2px;
  line-height: 1.4;
}
.eyebrow::before { width: 18px; height: 1px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 241, 228, .95);
  backdrop-filter: blur(12px);
}
.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: 20px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 10px; font-size: 21px; font-weight: 900; letter-spacing: -.3px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 6px; object-fit: contain; background: #fff; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 1px solid var(--pine);
  border-radius: 2px;
  color: var(--pine);
  font-size: 11px;
  font-style: normal;
  font-weight: 900;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.9vw, 26px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 1px solid transparent; color: var(--muted); font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--brown); color: var(--brown); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--brown);
  border-radius: 3px;
  background: var(--brown);
  color: #fdf6e6;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: var(--pine); border-color: var(--pine); }
.nav-download svg, .button svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 0; border: 1px solid var(--line); border-radius: 3px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 18px; height: 2px; margin: 5px auto; background: var(--brown); transition: transform .18s ease; }
.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: window lattice + three shelf rows */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(520px 340px at 82% 0%, rgba(62, 107, 87, .16), transparent 72%),
    linear-gradient(180deg, #fbf6ea 0%, var(--paper) 100%);
}
.lattice {
  position: absolute;
  inset: 0;
  opacity: .42;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 86px, rgba(107, 74, 47, .16) 86px 89px),
    repeating-linear-gradient(0deg, transparent 0 96px, rgba(107, 74, 47, .13) 96px 99px);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .72) 55%, rgba(0, 0, 0, .2) 100%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: clamp(24px, 4vw, 56px);
  padding: 58px 0 62px;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.4px;
}
.hero-kicker b {
  padding: 3px 8px;
  border: 1px solid var(--brown);
  border-radius: 2px;
  color: var(--brown);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1.6px;
}
.hero h1 {
  margin: 0;
  color: var(--brown);
  font-size: clamp(50px, 7.4vw, 92px);
  font-weight: 900;
  letter-spacing: clamp(-2px, -.4vw, -4px);
  line-height: 1;
}
.hero-subtitle {
  margin: 18px 0 0;
  color: var(--pine);
  font-size: clamp(18px, 2.05vw, 24px);
  font-weight: 800;
  letter-spacing: .5px;
  line-height: 1.4;
}
.hero-lead { max-width: 520px; 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: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 14px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--brown); color: #fdf6e6; box-shadow: 0 12px 24px rgba(107, 74, 47, .22); }
.button-primary:hover { background: var(--pine); transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: var(--brown); border-bottom: 1px dashed var(--brown-soft); font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--pine); }

.shelf {
  padding: 20px 20px 16px;
  border: 2px solid var(--brown);
  border-radius: 4px;
  background: linear-gradient(180deg, #fdf7ea, #f2e7d3);
  box-shadow: inset 0 0 0 6px #f9f2e2, 0 18px 34px rgba(107, 74, 47, .16);
}
.shelf-row {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 7px;
  padding: 0 0 9px;
  border-bottom: 6px solid #8a6544;
  box-shadow: 0 4px 0 -2px #63432a;
}
.shelf-row + .shelf-row { margin-top: 16px; }
.shelf-thumb {
  width: 96px;
  height: 128px;
  flex: none;
  border: 1px solid #c6b295;
  border-radius: 2px;
  object-fit: cover;
  object-position: top center;
}
.spine {
  display: block;
  width: 20px;
  min-width: 8px;
  max-width: 26px;
  flex: 1 1 14px;
  border-radius: 1px 1px 0 0;
}
.spine-a { height: 104px; background: var(--pine); }
.spine-b { height: 92px; background: var(--brown); }
.spine-c { height: 114px; background: #8f6f4d; }
.spine-d { height: 84px; background: #4f7a63; }
.spine-e { height: 98px; background: #b08b62; }
.shelf-no {
  position: absolute;
  top: 0;
  right: 0;
  color: var(--brown-soft);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2px;
}
.shelf-caption { margin: 16px 0 0; color: var(--muted); font-size: 12px; text-align: right; }

/* features: four across */
.features { padding: 74px 0 78px; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.section-heading { margin-bottom: 32px; }
.section-heading h2, .download h2 { margin: 0; color: var(--brown); font-size: clamp(24px, 2.8vw, 34px); font-weight: 900; letter-spacing: -.6px; line-height: 1.32; }
.section-heading > p:last-child { max-width: 620px; margin: 11px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(210px, 300px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 5px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.feature-card {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--pine);
  border-radius: 2px;
  background: var(--panel);
}
.feature-no {
  display: block;
  margin-bottom: 10px;
  color: var(--brown-soft);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.6px;
}
.feature-card h3 { margin: 0 0 7px; color: var(--brown); font-size: 17px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.82; }

/* shots: two by two */
.shots { padding: 74px 0 80px; }
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.shot-card { display: grid; grid-template-columns: 42% minmax(0, 1fr); align-items: stretch; margin: 0; border: 1px solid var(--line); border-radius: 2px; background: var(--panel); overflow: hidden; }
.shot-media {
  display: flex;
  align-items: stretch;
  justify-content: center;
  border-right: 1px solid var(--line);
  background: linear-gradient(160deg, #f4e9d6, #e9dcc4);
}
.shot-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
}
.shot-card figcaption {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 20px;
  background: linear-gradient(180deg, #fffdf7, #faf3e5);
  font-size: 20px;
  font-weight: 900;
  color: var(--brown);
  text-align: center;
}
.shot-card figcaption b {
  display: block;
  width: fit-content;
  color: #e3d3b7;
  font-family: var(--mono);
  font-size: 42px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1;
}
.shot-card figcaption small { color: var(--muted); font-size: 12.5px; font-weight: 500; line-height: 1.6; }

/* faq */
.faq { padding: 72px 0 78px; border-top: 1px solid var(--line); background: var(--paper-2); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .76fr) minmax(0, 1.24fr); gap: clamp(26px, 4vw, 54px); }
.faq-heading { position: sticky; top: calc(var(--header-height) + 26px); align-self: start; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; color: var(--brown); font-size: 15px; font-weight: 900; }
.faq-list summary i { position: relative; flex: none; width: 20px; height: 20px; border: 1px solid var(--brown-soft); border-radius: 50%; }
.faq-list summary i::before,
.faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1.5px;
  content: "";
  background: var(--pine);
  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(0); }
.faq-list details p { padding: 0 26px 17px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: three across */
.reviews { padding: 74px 0 80px; }
.review-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 18px 18px 18px 16px; border: 1px solid var(--line); border-left: 3px solid var(--pine); background: var(--panel); }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 5px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dashed var(--line); }
.review-meta b { color: var(--brown); font-size: 13px; font-weight: 900; }
.review-meta time { color: #a4937d; font-family: var(--mono); font-size: 9.5px; }
.review-card p { margin: 0; color: #6a5a48; font-size: 12.5px; line-height: 1.78; }

/* steps: vertical rail */
.steps { padding: 70px 0 76px; border-top: 1px solid var(--line); background: var(--paper-2); }
.step-list { padding: 0; margin: 0; list-style: none; border-left: 2px solid var(--line); }
.step-list li { display: grid; grid-template-columns: 64px minmax(0, 1fr); align-items: start; gap: 18px; padding: 0 0 22px 22px; margin-bottom: 22px; border-bottom: 1px dashed var(--line); }
.step-list li:last-child { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }
.step-list span { color: var(--pine); font-family: var(--mono); font-size: 26px; font-weight: 700; line-height: 1.1; }
.step-list h3 { margin: 0 0 5px; color: var(--brown); font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download */
.download { padding: 30px 0; }
.download-inner {
  padding: 48px clamp(24px, 5vw, 58px) 42px;
  border-radius: 4px;
  background:
    radial-gradient(420px 240px at 94% 0%, rgba(255, 255, 255, .18), transparent 70%),
    linear-gradient(116deg, #6b4a2f, #3e6b57 92%);
  color: #f7f1e4;
}
.download .eyebrow { color: #cfe0d2; }
.download h2 { max-width: 620px; color: #fdf6e6; }
.download-inner > p { max-width: 520px; margin: 12px 0 22px; color: #e2d9c6; font-size: 14px; }
.download .button-primary { background: #fdf6e6; color: #4a3220; box-shadow: 0 12px 24px rgba(0, 0, 0, .18); }
.download .button-primary:hover { background: #fff; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 20px 0 0; margin: 26px 0 0; border-top: 1px solid rgba(247, 241, 228, .26); list-style: none; }
.download-notes li { color: #ddd2bd; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 7px; content: "◈"; color: #a9c6b4; }

/* footer */
.site-footer { padding: 42px 0 50px; border-top: 1px solid var(--line); background: var(--paper); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 40px; align-items: start; }
.footer-brand strong { color: var(--brown); font-size: 18px; font-weight: 900; }
.footer-brand p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer-nav a { color: var(--muted); font-size: 12px; }
.footer-nav a:hover { color: var(--pine); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 22px; padding-top: 16px; 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: #9a8a74; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .review-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-card { grid-template-columns: 44% minmax(0, 1fr); }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 16px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 14px 24px rgba(107, 74, 47, .18);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .hero-grid { grid-template-columns: 1fr; padding: 44px 0 50px; }
  .shelf { justify-self: start; width: min(100%, 420px); }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .nav-shell { gap: 8px; }
  .brand { font-size: 18px; gap: 7px; }
  .brand img { width: 32px; height: 32px; }
  .nav-download { min-height: 38px; padding: 0 11px; font-size: 11.5px; gap: 5px; }
  .nav-download svg { width: 15px; height: 15px; }
  .menu-toggle { width: 38px; height: 38px; }
  .hero h1 { font-size: clamp(44px, 14vw, 62px); }
  .hero-lead { font-size: 14px; }
  .feature-grid { grid-template-columns: 1fr; }
  .review-list { grid-template-columns: 1fr; }
  .shot-grid { grid-template-columns: 1fr; }
  .shot-card { grid-template-columns: 128px minmax(0, 1fr); }
  .shot-card figcaption { padding: 14px; font-size: 17px; }
  .section-heading-split { grid-template-columns: 1fr; gap: 8px; }
  .section-heading-split > p:last-child { margin: 0; }
  .step-list li { grid-template-columns: 48px minmax(0, 1fr); gap: 12px; }
  .step-list span { font-size: 21px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 17px; gap: 7px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-actions { gap: 8px; }
  .nav-download { min-height: 34px; padding: 0 10px; font-size: 11px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 42px; }
  .hero-subtitle { font-size: 16px; }
  .button { width: 100%; }
  .shelf { padding: 14px 14px 12px; }
  .shelf-thumb { width: 76px; height: 102px; }
  .spine-a, .spine-c { height: 86px; }
  .spine-b, .spine-e { height: 76px; }
  .spine-d { height: 70px; }
  .shot-card { grid-template-columns: 108px minmax(0, 1fr); }
  .shot-card figcaption { padding: 12px; font-size: 15px; gap: 5px; }
  .shot-card figcaption small { font-size: 11px; }
}