@charset "UTF-8";

:root {
  --paper: #FFFCF0;
  --paper-2: #FFF7D6;
  --card: #FFFFFF;
  --ink: #1F2937;
  --ink-soft: #4B5563;
  --muted: #6B7280;
  --line: #E9E2C6;
  --yellow: #FDE047;
  --yellow-deep: #EAB808;
  --shell: 1160px;
  --header-height: 72px;
  --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;
  overflow-wrap: anywhere;
}
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(--yellow-deep); outline-offset: 3px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1.4;
}
.eyebrow::before { width: 14px; height: 8px; border-radius: 2px; content: ""; background: var(--yellow); }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
}
.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-size: 20px; font-weight: 900; letter-spacing: -.3px; }
.brand img { width: 36px; height: 36px; border: 2px solid var(--ink); border-radius: 10px; object-fit: contain; background: var(--yellow); }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--yellow);
  font-size: 10px;
  font-style: normal;
  font-weight: 900;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.7vw, 24px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; border-bottom: 2px solid transparent; color: var(--ink-soft); font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--yellow-deep); 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: 7px;
  padding: 0 17px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--yellow);
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform .16s ease, box-shadow .16s ease;
}
.nav-download:hover { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.nav-download svg, .button svg { width: 17px; height: 17px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 0; border: 2px solid var(--ink); border-radius: 10px; background: var(--yellow); cursor: pointer; }
.menu-toggle span { display: block; width: 18px; height: 2px; margin: 5px auto; background: var(--ink); 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 */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  background:
    radial-gradient(620px 320px at 50% -6%, rgba(253, 224, 71, .85), transparent 70%),
    linear-gradient(180deg, #FFFBDF 0%, var(--paper) 100%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: radial-gradient(rgba(31, 41, 55, .12) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(180deg, #000 10%, transparent 62%);
  pointer-events: none;
}
.hero .page-shell { position: relative; z-index: 2; }
.hero-head { max-width: 720px; padding: 46px 0 6px; }
.hero-kicker {
  display: flex;
  width: max-content;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.2px;
}
.hero-kicker b {
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--yellow);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 1px;
}
.hero h1 {
  display: inline-block;
  margin: 0;
  padding: 0 10px 4px;
  font-size: clamp(46px, 7vw, 86px);
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.08;
}
.hero h1::after {
  display: block;
  height: 12px;
  margin-top: -10px;
  content: "";
  background: var(--yellow);
  border-radius: 2px;
}
.hero-subtitle { margin: 16px 0 0; color: var(--ink); font-size: clamp(17px, 2vw, 22px); font-weight: 800; line-height: 1.4; }
.hero-lead { max-width: 560px; margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.rail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 268px) minmax(0, 1fr);
  align-items: center;
  gap: clamp(16px, 2.6vw, 34px);
  padding: 34px 0 18px;
}
.rail {
  padding: 16px 16px 14px;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 5px 5px 0 rgba(31, 41, 55, .12);
}
.rail-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin: 0 0 8px; }
.rail-head b { font-size: 14px; font-weight: 900; }
.rail-head span { color: var(--muted); font-family: var(--mono); font-size: 10px; }
.rail ol { padding: 0; margin: 0; list-style: none; }
.rail li { display: flex; align-items: baseline; gap: 10px; padding: 6px 0; border-top: 1px dashed var(--line); }
.rail li:first-child { border-top: 0; }
.rail em { flex: none; padding: 1px 6px; border-radius: 4px; background: var(--paper-2); color: var(--ink); font-family: var(--mono); font-size: 10.5px; font-style: normal; }
.rail li span { color: var(--ink-soft); font-size: 12.5px; }
.rail-go { border-bottom-left-radius: 26px; }
.rail-back { border-bottom-right-radius: 26px; }

.phone {
  position: relative;
  margin: 0;
  padding: 9px 9px 0;
  border: 2px solid var(--ink);
  border-radius: 30px;
  background: var(--ink);
  box-shadow: 0 18px 40px rgba(31, 41, 55, .28);
}
.phone-speaker { display: block; width: 54px; height: 5px; margin: 2px auto 7px; border-radius: 999px; background: #556070; }
.phone img { width: 100%; height: auto; aspect-ratio: 3 / 5; object-fit: cover; object-position: top center; border-radius: 20px; }
.phone figcaption { padding: 8px 4px 11px; color: #E5E7EB; text-align: center; font-size: 11px; line-height: 1.5; }
.phone figcaption b { display: block; color: var(--yellow); font-size: 11.5px; letter-spacing: 1px; }

.hero-foot { display: flex; align-items: center; flex-wrap: wrap; gap: 14px 20px; padding: 4px 0 42px; }
.speed-pill {
  padding: 7px 16px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--yellow);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 12px;
  padding: 0 26px;
  border: 2px solid var(--ink);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .16s ease, box-shadow .16s ease;
}
.button-primary { background: var(--yellow); color: var(--ink); box-shadow: 4px 4px 0 var(--ink); }
.button-primary:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: var(--ink-soft); border-bottom: 2px dotted var(--yellow-deep); font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 4px; color: var(--ink); }

/* features */
.features { padding: 62px 0 66px; background: var(--paper-2); border-bottom: 2px solid var(--ink); }
.section-heading { margin-bottom: 26px; }
.section-heading h2 { margin: 0; font-size: clamp(23px, 2.6vw, 33px); font-weight: 900; letter-spacing: -.6px; line-height: 1.3; }
.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(180px, 280px); align-items: end; gap: 22px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 1fr);
  gap: 12px;
  padding-bottom: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--yellow-deep) transparent;
}
.feature-card {
  padding: 20px 18px 18px;
  border: 2px solid var(--ink);
  border-radius: 12px;
  background: var(--card);
  scroll-snap-align: start;
}
.feature-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 20px;
  margin-bottom: 10px;
  border-radius: 4px;
  background: var(--yellow);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
}
.feature-card h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.8; }

/* shots */
.shots { padding: 64px 0 70px; }
.shot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; align-items: start; }
.shot-card { margin: 0; border: 2px solid var(--ink); border-radius: 12px; background: var(--card); overflow: hidden; }
.shot-card img { width: 100%; height: auto; object-fit: cover; object-position: top center; }
.shot-card:nth-child(1) img { aspect-ratio: 9 / 16; }
.shot-card:nth-child(2) img { aspect-ratio: 3 / 5; }
.shot-card:nth-child(3) img { aspect-ratio: 9 / 16; }
.shot-card:nth-child(4) img { aspect-ratio: 3 / 5; }
.shot-card:nth-child(2) { margin-top: 30px; }
.shot-card:nth-child(3) { margin-top: 12px; }
.shot-card:nth-child(4) { margin-top: 44px; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 10px 12px 11px; border-top: 2px solid var(--ink); }
.shot-card figcaption b { color: var(--ink); background: var(--yellow); border-radius: 4px; padding: 0 5px; font-family: var(--mono); font-size: 10px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 12.8px; font-weight: 800; line-height: 1.4; }
.shot-card figcaption small { color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq */
.faq { padding: 62px 0 68px; border-top: 2px solid var(--ink); background: var(--paper-2); }
.faq-layout { display: block; }
.faq-heading { max-width: 640px; }
.faq-list { max-width: 900px; margin-top: 8px; border-top: 2px 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-size: 15.5px; font-weight: 900; }
.faq-list summary h3::before { margin-right: 9px; content: "Q"; color: var(--yellow-deep); font-family: var(--mono); font-size: 12px; }
.faq-list summary i { position: relative; flex: none; width: 24px; height: 24px; border: 2px solid var(--ink); border-radius: 50%; background: var(--yellow); }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; height: 2px; 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(0); }
.faq-list details p { padding: 0 30px 16px 24px; margin: 0; color: var(--ink-soft); font-size: 13.5px; line-height: 1.85; }

/* reviews */
.reviews { padding: 64px 0 70px; }
.review-list { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: start;
  gap: 16px;
  padding: 18px 22px;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--card);
}
.avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--yellow);
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
  border: 2px solid var(--ink);
}
.review-body { min-width: 0; }
.review-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 4px; }
.review-meta b { font-size: 13.5px; font-weight: 900; }
.review-meta time { color: #9A9282; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.75; }

/* steps */
.steps { padding: 60px 0 66px; border-top: 2px solid var(--ink); background: var(--paper-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.step-list li {
  position: relative;
  padding: 20px 20px 18px;
  border: 2px solid var(--ink);
  border-radius: 12px 24px 12px 12px;
  background: var(--card);
}
.step-list li::after {
  position: absolute;
  top: 22px;
  right: -11px;
  width: 8px;
  height: 8px;
  border-top: 2px solid var(--ink);
  border-right: 2px solid var(--ink);
  content: "";
  transform: rotate(45deg);
}
.step-list li:last-child::after { display: none; }
.step-list span { display: inline-block; margin-bottom: 8px; padding: 1px 8px; border-radius: 4px; background: var(--yellow); font-family: var(--mono); font-size: 11px; font-weight: 700; }
.step-list h3 { margin: 0 0 5px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.75; }

/* download */
.download { padding: 26px 0 34px; }
.download-inner {
  padding: 40px clamp(22px, 4vw, 48px) 34px;
  border: 2px solid var(--ink);
  border-radius: 20px;
  background:
    radial-gradient(420px 220px at 80% 0%, rgba(253, 224, 71, .55), transparent 70%),
    var(--card);
  text-align: center;
}
.download h2 { margin: 0 0 18px; font-size: clamp(22px, 2.6vw, 32px); font-weight: 900; letter-spacing: -.5px; }
.download .button-large { display: inline-flex; }
.download-note { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 20px; padding: 16px 0 0; margin: 18px 0 0; border-top: 1px dashed var(--line); list-style: none; }
.download-notes li { color: var(--ink-soft); font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 6px; content: "·"; color: var(--yellow-deep); }

/* footer */
.site-footer { padding: 38px 0 46px; border-top: 2px solid var(--ink); background: var(--ink); color: #E5E7EB; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 36px; align-items: start; }
.footer-brand strong { font-size: 17px; font-weight: 900; color: var(--yellow); }
.footer-brand p { margin: 3px 0 0; color: #9CA3AF; font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: #D1D5DB; font-size: 12px; }
.footer-nav a:hover { color: var(--yellow); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 18px; padding-top: 15px; border-top: 1px solid #374151; color: #9CA3AF; font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: #9CA3AF; }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #8A94A3; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .rail-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 232px) minmax(0, 1fr); gap: 14px; }
  .hero-head { padding-top: 38px; }
  .shot-card:nth-child(2), .shot-card:nth-child(4) { margin-top: 18px; }
  .shot-card:nth-child(3) { margin-top: 0; }
  .feature-track { grid-auto-columns: minmax(220px, 1fr); }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 14px;
    border-bottom: 2px solid var(--ink);
    background: var(--paper);
  }
  .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 dashed var(--line); }
}
@media (max-width: 768px) {
  .page-shell, .nav-shell { width: calc(100% - 36px); }
  .rail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 26px 0 12px; }
  .phone { grid-column: 1 / -1; justify-self: center; width: min(100%, 260px); }
  .hero-head { padding: 32px 0 0; }
  .hero h1 { font-size: clamp(40px, 11vw, 58px); }
  .hero-foot { padding-bottom: 32px; }
  .features, .shots, .faq, .reviews, .steps { padding: 48px 0 52px; }
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .shot-card:nth-child(n) { margin-top: 0; }
  .step-list { grid-template-columns: 1fr; }
  .step-list li::after { top: auto; right: auto; bottom: -7px; left: 26px; transform: rotate(135deg); }
  .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: 560px) {
  .brand { font-size: 17px; gap: 7px; }
  .brand img { width: 31px; height: 31px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 36px; padding: 0 11px; font-size: 11.5px; gap: 5px; box-shadow: 2px 2px 0 var(--ink); }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 36px; height: 36px; }
  .rail-grid { grid-template-columns: 1fr; }
  .rail-go, .rail-back { border-radius: 14px; }
  .hero h1 { font-size: 40px; letter-spacing: -1px; }
  .hero-subtitle { font-size: 16px; }
  .hero-foot { gap: 10px 14px; }
  .button { width: 100%; }
  .speed-pill { font-size: 11px; }
  .review-card { grid-template-columns: 40px minmax(0, 1fr); gap: 12px; padding: 15px 16px; }
  .avatar { width: 40px; height: 40px; font-size: 15px; }
  .faq-list details p { padding-right: 6px; }
  .download-notes { flex-direction: column; align-items: center; gap: 4px; }
}