:root {
  --ink: #17202a;
  --paper: #fffaf0;
  --white: #ffffff;
  --coral: #ff5a5f;
  --mint: #9cebd5;
  --yellow: #ffd34e;
  --blue: #3977f6;
  --muted: #5d6670;
  --line: 2px solid var(--ink);
  --shadow: 5px 5px 0 var(--ink);
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 99; padding: 8px 14px; background: var(--ink); color: #fff; }
.skip-link:focus { top: 10px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 250, 240, .96);
  border-bottom: var(--line);
  backdrop-filter: blur(10px);
}
.nav-row { min-height: 74px; display: flex; align-items: center; gap: 26px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; font-size: 22px; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border: 2px solid var(--ink); border-radius: 8px; }
.nav-links { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.nav-links a { font-size: 15px; font-weight: 700; border-bottom: 3px solid transparent; }
.nav-links a:hover, .nav-links a.active { border-color: var(--coral); }
.nav-toggle { display: none; width: 44px; height: 44px; margin-left: auto; border: var(--line); background: var(--white); font-size: 23px; cursor: pointer; }
.download-btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: var(--line);
  border-radius: 5px;
  background: var(--coral);
  color: var(--ink);
  font-weight: 900;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform .15s ease, box-shadow .15s ease;
}
.download-btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }
.download-btn:focus-visible, .nav-toggle:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.download-btn.small { min-height: 42px; padding: 7px 17px; font-size: 14px; }

.hero { position: relative; overflow: hidden; border-bottom: var(--line); background: var(--mint); }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .22;
  background-image: radial-gradient(var(--ink) 1.2px, transparent 1.2px);
  background-size: 16px 16px;
}
.hero-grid { position: relative; min-height: 640px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 60px; padding-block: 72px; }
.eyebrow { display: inline-block; margin-bottom: 20px; padding: 5px 11px; border: var(--line); background: var(--yellow); font-size: 13px; font-weight: 900; }
h1, h2, h3 { margin-top: 0; line-height: 1.22; letter-spacing: 0; }
h1 { margin-bottom: 20px; font-size: clamp(42px, 7vw, 82px); font-weight: 950; }
.hero-copy { max-width: 650px; margin: 0 0 28px; font-size: 18px; font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.text-link { font-weight: 900; text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 5px; }
.hero-note { margin-top: 22px; font-size: 13px; color: #33404a; }
.hero-visual { position: relative; min-height: 490px; display: grid; place-items: center; }
.phone-frame { position: relative; width: min(320px, 78vw); padding: 14px; border: 4px solid var(--ink); border-radius: 28px; background: var(--ink); box-shadow: 12px 12px 0 rgba(255,255,255,.75); transform: rotate(2.5deg); }
.phone-frame::before { content: ""; position: absolute; top: 7px; left: 50%; width: 70px; height: 8px; transform: translateX(-50%); border-radius: 8px; background: var(--ink); z-index: 2; }
.phone-frame img { width: 100%; max-width: 400px; border-radius: 16px; }
.burst { position: absolute; display: grid; place-items: center; width: 112px; aspect-ratio: 1; padding: 14px; clip-path: polygon(50% 0,61% 26%,85% 15%,74% 39%,100% 50%,74% 61%,85% 85%,61% 74%,50% 100%,39% 74%,15% 85%,26% 61%,0 50%,26% 39%,15% 15%,39% 26%); background: var(--yellow); font-size: 14px; line-height: 1.2; font-weight: 950; text-align: center; }
.burst.left { left: 0; top: 30px; transform: rotate(-9deg); }
.burst.right { right: 0; bottom: 42px; transform: rotate(7deg); background: var(--coral); }

.section { padding: 88px 0; }
.section.alt { background: var(--white); border-block: var(--line); }
.section.dark { background: var(--ink); color: var(--white); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 38px; }
.section h2 { margin-bottom: 0; font-size: clamp(30px, 4vw, 48px); }
.section-kicker { padding: 4px 9px; border: var(--line); background: var(--yellow); color: var(--ink); font-weight: 900; font-size: 13px; }
.section.dark .section-kicker { border-color: var(--white); }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card, .review-card, .link-card {
  border: var(--line);
  border-radius: 6px;
  background: var(--white);
  box-shadow: var(--shadow);
}
.feature-card { min-height: 245px; padding: 25px; }
.feature-card:nth-child(2) { background: #fff3d1; }
.feature-card:nth-child(3) { background: #e6f0ff; }
.feature-card:nth-child(4) { background: #ddf8ef; }
.feature-no { display: block; margin-bottom: 28px; color: var(--coral); font-size: 30px; font-weight: 950; }
.feature-card h3 { margin-bottom: 10px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }

.preview-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: center; }
.preview-stage { display: flex; align-items: flex-end; justify-content: center; gap: 20px; min-height: 540px; }
.preview-shot { width: min(280px, 42vw); max-width: 400px; border: 4px solid var(--ink); border-radius: 20px; box-shadow: 9px 9px 0 var(--coral); }
.preview-shot.second { margin-bottom: 42px; box-shadow: 9px 9px 0 var(--blue); }
.check-list { list-style: none; padding: 0; margin: 32px 0; }
.check-list li { position: relative; padding: 14px 0 14px 38px; border-bottom: 1px dashed #8d969c; font-weight: 700; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 14px; width: 24px; height: 24px; display: grid; place-items: center; border: 2px solid var(--ink); background: var(--yellow); font-size: 13px; }

.path-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.link-card { position: relative; min-height: 240px; padding: 30px 32px; overflow: hidden; }
.link-card:first-child { background: var(--yellow); }
.link-card:last-child { background: var(--blue); color: var(--white); }
.link-card h3 { max-width: 370px; margin-bottom: 12px; font-size: 28px; }
.link-card p { max-width: 430px; margin: 0 0 28px; }
.link-card .arrow { position: absolute; right: 24px; bottom: 16px; font-size: 56px; font-weight: 900; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); border: var(--line); background: var(--white); color: var(--ink); }
.stat { min-height: 150px; display: grid; place-content: center; text-align: center; padding: 20px; }
.stat + .stat { border-left: var(--line); }
.stat strong { font-size: 34px; line-height: 1; }
.stat span { margin-top: 10px; font-size: 13px; color: var(--muted); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; color: var(--ink); }
.review-card { min-height: 190px; padding: 24px; }
.review-card blockquote { margin: 0 0 20px; font-weight: 700; }
.review-card cite { font-style: normal; font-size: 13px; color: var(--muted); }

.faq-list { display: grid; gap: 12px; }
details { border: var(--line); border-radius: 5px; background: var(--white); }
summary { position: relative; cursor: pointer; list-style: none; padding: 18px 54px 18px 20px; font-weight: 900; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 20px; top: 13px; font-size: 27px; }
details[open] summary::after { content: "−"; }
.answer { padding: 0 20px 20px; color: var(--muted); }
.answer p { margin: 0; }

.download-band { padding: 64px 0; background: var(--coral); border-top: var(--line); }
.download-band-row { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-band h2 { max-width: 690px; margin: 0; font-size: clamp(28px, 4vw, 46px); }
.download-band .download-btn { background: var(--yellow); }
.site-footer { padding: 48px 0 28px; background: var(--ink); color: #e7edf1; }
.footer-grid { display: grid; grid-template-columns: 1.3fr .7fr .7fr; gap: 40px; }
.site-footer .brand { color: var(--white); }
.site-footer h3 { margin-bottom: 12px; font-size: 15px; color: var(--yellow); }
.footer-links { display: grid; gap: 8px; }
.footer-links a:hover { color: var(--mint); }
.disclaimer { margin: 34px 0 0; padding-top: 22px; border-top: 1px solid #48515b; font-size: 12px; color: #aeb8c1; }
.copyright { margin-top: 8px; font-size: 12px; color: #7f8b95; }

.page-hero { padding: 90px 0 72px; border-bottom: var(--line); background: var(--yellow); }
.page-hero.blue { background: #dfeaff; }
.page-hero h1 { max-width: 860px; font-size: clamp(38px, 6vw, 68px); }
.page-hero p { max-width: 720px; margin: 0; font-size: 18px; font-weight: 650; }
.breadcrumb { margin-bottom: 18px; font-size: 13px; font-weight: 800; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 56px; align-items: start; }
.content-layout > *, .article { min-width: 0; }
.article section { margin-bottom: 62px; scroll-margin-top: 100px; }
.article h2 { margin-bottom: 24px; font-size: 32px; }
.article h3 { margin: 28px 0 10px; font-size: 21px; }
.article p { margin: 0 0 16px; color: #3f4a54; }
.steps { display: grid; gap: 20px; counter-reset: guide; }
.step { counter-increment: guide; display: grid; grid-template-columns: 68px 1fr; gap: 22px; padding: 24px; border: var(--line); background: var(--white); box-shadow: 4px 4px 0 var(--ink); }
.step::before { content: counter(guide); width: 58px; height: 58px; display: grid; place-items: center; border: var(--line); background: var(--coral); font-size: 24px; font-weight: 950; }
.step h3 { margin-top: 0; }
.step p:last-child { margin-bottom: 0; }
.notice { padding: 22px 24px; border-left: 7px solid var(--coral); background: #fff0f0; }
.notice strong { display: block; margin-bottom: 6px; }
.side-nav { position: sticky; top: 100px; padding: 22px; border: var(--line); background: var(--mint); box-shadow: var(--shadow); }
.side-nav strong { display: block; margin-bottom: 12px; }
.side-nav a { display: block; padding: 8px 0; border-bottom: 1px dashed #6c8b82; font-size: 14px; font-weight: 700; }
.table-wrap { width: 100%; max-width: 100%; overflow-x: auto; border: var(--line); }
table { width: 100%; min-width: 600px; border-collapse: collapse; background: var(--white); }
th, td { padding: 14px 16px; border-bottom: 1px solid #ccd2d6; text-align: left; vertical-align: top; }
th { background: var(--ink); color: var(--white); }
.quick-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.quick-links a { padding: 18px; border: var(--line); background: var(--yellow); font-weight: 900; box-shadow: 3px 3px 0 var(--ink); }

@media (max-width: 920px) {
  .hero-grid, .preview-grid, .content-layout { grid-template-columns: 1fr; }
  .hero-grid { gap: 30px; padding-block: 54px; }
  .hero-visual { min-height: 450px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .content-layout { gap: 28px; }
  .side-nav { position: static; order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .nav-row { min-height: 66px; gap: 12px; }
  .nav-toggle { display: block; }
  .nav-links { position: absolute; left: 0; right: 0; top: 66px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 14px 18px; border-bottom: var(--line); background: var(--paper); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 8px; }
  .nav-row > .download-btn { display: none; }
  h1 { font-size: 44px; }
  .hero-grid { min-height: auto; }
  .hero-copy { font-size: 16px; }
  .burst { width: 92px; font-size: 12px; }
  .burst.left { left: -8px; }
  .burst.right { right: -6px; }
  .section { padding: 62px 0; }
  .section-head { align-items: start; flex-direction: column; margin-bottom: 28px; }
  .feature-grid, .path-grid, .review-grid, .quick-links { grid-template-columns: 1fr; }
  .feature-card { min-height: 210px; }
  .preview-stage { min-height: 430px; gap: 10px; }
  .preview-shot { width: 44vw; }
  .stats { grid-template-columns: 1fr; }
  .stat { min-height: 116px; }
  .stat + .stat { border-left: 0; border-top: var(--line); }
  .download-band-row { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .page-hero { padding: 62px 0 50px; }
  .page-hero h1 { max-width: 100%; overflow-wrap: anywhere; word-break: break-word; font-size: 36px; }
  .step { grid-template-columns: 48px 1fr; gap: 14px; padding: 18px; }
  .step::before { width: 44px; height: 44px; font-size: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}