@charset "UTF-8";

:root {
  --paper: #EFE3CB;
  --paper-2: #E6D6B8;
  --ink: #1C1A17;
  --ink-soft: #4A443A;
  --ink-fade: #7C7261;
  --line: rgba(28, 26, 23, .22);
  --shell: 1180px;
  --header-height: 70px;
  --serif: "Songti SC", "SimSun", "STSong", Georgia, serif;
  --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(--ink); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  color: var(--ink-fade);
  font-family: var(--serif);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  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(--ink);
  background: rgba(239, 227, 203, .96);
  backdrop-filter: blur(10px);
}
.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-family: var(--serif); font-size: 21px; font-weight: 900; letter-spacing: 2px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--ink); object-fit: contain; background: #F6EDDC; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.9vw, 25px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 1px solid transparent; color: var(--ink-soft); font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--ink); 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: 42px;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--ink); }
.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(--ink); background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 18px; height: 1.5px; margin: 5px auto; background: var(--ink); transition: transform .18s ease; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.2px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.2px) rotate(-45deg); }

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--ink);
  background:
    radial-gradient(560px 340px at 86% -8%, rgba(28, 26, 23, .10), transparent 72%),
    linear-gradient(180deg, #F4EAD8 0%, var(--paper) 100%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: repeating-linear-gradient(180deg, rgba(28, 26, 23, .05) 0 1px, transparent 1px 34px);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(24px, 4vw, 56px);
  padding: 54px 0 30px;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--ink-fade);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.5px;
}
.hero-kicker b { padding: 2px 7px; border: 1px solid var(--ink); color: var(--ink); font-size: 9.5px; font-weight: 900; letter-spacing: 1.2px; }
.title-stand { display: flex; align-items: flex-start; gap: 16px; }
.hero h1 {
  margin: 0;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--serif);
  font-size: clamp(46px, 5.6vw, 76px);
  font-weight: 900;
  letter-spacing: .1em;
  line-height: 1.02;
}
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-top: 6px;
  border: 2px solid var(--ink);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}
.hero-subtitle {
  margin: 22px 0 0;
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1.5;
}
.hero-subtitle::after { display: block; width: 56px; height: 2px; margin-top: 12px; content: ""; background: var(--ink); }
.hero-lead { max-width: 520px; margin: 16px 0 0; color: var(--ink-soft); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 14px;
  padding: 0 28px;
  border: 1px solid var(--ink);
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--ink); color: var(--paper); }
.button-primary:hover { background: #3A342B; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 34px; font-size: 15px; }
.text-link { color: var(--ink-soft); border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--ink); }

.book-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  min-width: 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: rgba(255, 255, 255, .26);
}
.book-col { min-width: 0; padding: 18px 18px 20px; }
.book-col + .book-col { border-left: 1px solid var(--line); }
.book-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 9px;
  margin: 0 0 6px;
  border-bottom: 1px dashed var(--line);
  font-family: var(--serif);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 1px;
}
.book-head b { color: var(--ink-fade); font-family: var(--mono); font-size: 10px; font-weight: 700; }
.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: 9px 0; border-bottom: 1px dotted rgba(28, 26, 23, .2); }
.book-col li:last-child { border-bottom: 0; }
.book-col li span { font-size: 13px; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.book-col li small { flex: none; color: var(--ink-fade); font-family: var(--mono); font-size: 10px; }

.ink-divider { position: relative; z-index: 2; height: 34px; margin: 0 0 38px; overflow: hidden; }
.ink-divider::before {
  position: absolute;
  top: 15px;
  right: 0;
  left: 0;
  height: 2px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--ink) 10%, var(--ink) 90%, transparent);
}
.ink-divider span {
  position: absolute;
  top: 4px;
  left: 50%;
  width: 190px;
  height: 26px;
  content: "";
  background: radial-gradient(50% 62% at 50% 50%, rgba(28, 26, 23, .38), transparent 72%);
  transform: translateX(-50%);
}

/* features */
.features { padding: 70px 0 74px; border-bottom: 1px solid var(--ink); background: var(--paper-2); }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-family: var(--serif); font-size: clamp(24px, 2.7vw, 34px); font-weight: 900; letter-spacing: 1px; line-height: 1.35; }
.section-heading > p:last-child { max-width: 620px; margin: 11px 0 0; color: var(--ink-soft); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(190px, 280px); 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: 0 26px; }
.feature-card { padding: 20px 0 18px; border-top: 1px solid var(--ink); }
.feature-card h3 { margin: 0 0 6px; font-family: var(--serif); font-size: 17.5px; font-weight: 900; letter-spacing: 1px; }
.feature-card p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.85; }
.feature-no { float: right; color: var(--ink-fade); font-family: var(--serif); font-size: 13px; font-weight: 700; }

/* shots */
.shots { padding: 70px 0 76px; }
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.shot-card {
  display: grid;
  grid-template-columns: minmax(0, 42%) minmax(0, 1fr);
  align-items: stretch;
  margin: 0;
  border: 1px solid var(--ink);
  background: rgba(255, 255, 255, .28);
  overflow: hidden;
}
.shot-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; object-fit: cover; object-position: center 6%; }
.shot-card figcaption { display: flex; flex-direction: column; justify-content: center; gap: 6px; padding: 16px 18px; border-left: 1px solid var(--line); }
.shot-card figcaption b { color: var(--ink-fade); font-family: var(--serif); font-size: 12px; }
.shot-card figcaption span { display: flex; flex-direction: column; gap: 4px; font-family: var(--serif); font-size: 15px; font-weight: 900; letter-spacing: 1px; line-height: 1.4; }
.shot-card figcaption small { color: var(--ink-soft); font-family: "Microsoft YaHei", sans-serif; font-size: 11px; font-weight: 500; letter-spacing: 0; }

/* faq */
.faq { padding: 68px 0 74px; border-top: 1px solid var(--ink); background: var(--paper-2); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr); gap: clamp(24px, 4vw, 52px); }
.faq-heading { position: sticky; top: calc(var(--header-height) + 26px); align-self: start; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; 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: 15.5px; font-weight: 900; letter-spacing: .5px; }
.faq-list summary i { position: relative; flex: none; width: 24px; height: 1px; background: var(--ink); transition: transform .2s ease; }
.faq-list summary i::after { position: absolute; top: -4.5px; left: 50%; width: 1px; height: 10px; content: ""; background: var(--ink); transform: translateX(-50%); transition: transform .2s ease; }
.faq-list details[open] summary i::after { transform: translateX(-50%) rotate(90deg); }
.faq-list details p { padding: 0 26px 16px 0; margin: 0; color: var(--ink-soft); font-size: 13.5px; line-height: 1.9; }

/* reviews */
.reviews { padding: 70px 0 84px; }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; align-items: start; }
.review-card { padding: 18px 20px 18px 18px; border: 1px solid var(--line); border-left: 3px solid var(--ink); background: rgba(255, 255, 255, .3); }
.review-card:nth-child(2n) { margin-top: 24px; }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dashed var(--line); }
.review-meta b { font-family: var(--serif); font-size: 14px; font-weight: 900; letter-spacing: 1px; }
.review-meta time { color: var(--ink-fade); font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.8; }

/* steps */
.steps { padding: 66px 0 72px; border-top: 1px solid var(--ink); background: var(--paper-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; padding: 0; margin: 0; list-style: none; border-top: 1px solid var(--ink); }
.step-list li { padding: 22px 22px 20px 0; }
.step-list li + li { padding-left: 22px; border-left: 1px solid var(--line); }
.step-list span { display: block; margin-bottom: 8px; color: var(--ink-fade); font-family: var(--serif); font-size: 20px; font-weight: 700; line-height: 1; }
.step-list h3 { margin: 0 0 6px; font-family: var(--serif); font-size: 16.5px; font-weight: 900; letter-spacing: 1px; }
.step-list p { margin: 0; color: var(--ink-soft); font-size: 12.8px; line-height: 1.8; }

/* download */
.download { padding: 26px 0; }
.download-inner {
  padding: 48px clamp(24px, 5vw, 58px) 42px;
  background:
    radial-gradient(420px 240px at 92% 0%, rgba(239, 227, 203, .16), transparent 70%),
    var(--ink);
  color: var(--paper);
}
.download .eyebrow { color: rgba(239, 227, 203, .68); }
.download h2 { max-width: 600px; color: var(--paper); }
.download-inner > p { max-width: 520px; margin: 12px 0 22px; color: rgba(239, 227, 203, .78); font-size: 14px; }
.download .button-primary { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.download .button-primary:hover { background: #FBF3E2; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 20px 0 0; margin: 26px 0 0; border-top: 1px solid rgba(239, 227, 203, .28); list-style: none; }
.download-notes li { color: rgba(239, 227, 203, .8); font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 8px; content: "·"; }

/* footer */
.site-footer { padding: 42px 0 50px; border-top: 1px solid var(--ink); }
.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: 19px; font-weight: 900; letter-spacing: 2px; }
.footer-brand p { margin: 4px 0 0; color: var(--ink-fade); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer-nav a { color: var(--ink-soft); font-size: 12px; }
.footer-nav a:hover { color: var(--ink); }
.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(--ink-fade); font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: var(--ink-fade); }
.disclaimer { grid-column: 1 / -1; margin: 0; color: var(--ink-fade); font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .hero-grid { gap: 26px; }
  .shot-grid { 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: 8px 24px 16px;
    border-bottom: 1px solid var(--ink);
    background: var(--paper);
    box-shadow: 0 16px 26px rgba(28, 26, 23, .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: 42px 0 24px; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
  .review-list { grid-template-columns: 1fr; }
  .review-card:nth-child(2n) { margin-top: 0; }
  .step-list { grid-template-columns: 1fr; }
  .step-list li { padding: 16px 0; }
  .step-list li + li { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero h1 { font-size: clamp(40px, 12vw, 56px); }
  .hero-subtitle { font-size: 17px; letter-spacing: 1px; }
  .hero-lead { font-size: 14px; }
  .book-col { padding: 14px 12px 16px; }
  .book-head { font-size: 13.5px; }
  .book-col li span { font-size: 12.5px; }
  .feature-grid { grid-template-columns: 1fr; gap: 0; }
  .shot-card { grid-template-columns: 1fr; }
  .shot-card img { aspect-ratio: 4 / 3; object-position: center 8%; }
  .shot-card figcaption { border-left: 0; border-top: 1px solid var(--line); }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 17px; gap: 7px; letter-spacing: 1px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-actions { gap: 8px; }
  .nav-download { min-height: 34px; padding: 0 9px; font-size: 11px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 38px; }
  .hero-subtitle { font-size: 15px; }
  .seal { width: 32px; height: 32px; font-size: 16px; }
  .button { width: 100%; }
  .book-panel { grid-template-columns: 1fr; }
  .book-col + .book-col { border-left: 0; border-top: 1px solid var(--line); }
}