:root {
  --chestnut: #5a2b22;
  --dark: #321a16;
  --orange: #e77732;
  --orange-soft: #ffd9bd;
  --moss: #43654b;
  --moss-soft: #dfeade;
  --paper: #fff9ef;
  --paper-deep: #f3e8d7;
  --ink: #211b18;
  --muted: #6f625b;
  --line: #d8c8b7;
  --white: #fff;
  --shadow: 0 18px 50px rgba(60, 35, 25, .13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; line-height: 1.75; }
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3 { margin-top: 0; color: var(--dark); line-height: 1.25; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(90,43,34,.15); background: rgba(255,249,239,.96); backdrop-filter: blur(12px); }
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--dark); font-size: 20px; font-weight: 900; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 8px; }
.site-nav { display: flex; align-items: center; gap: 24px; font-size: 15px; font-weight: 700; }
.site-nav > a:not(.download-button) { position: relative; padding: 8px 0; }
.site-nav > a:not(.download-button)::after { position: absolute; right: 100%; bottom: 2px; left: 0; height: 2px; content: ""; background: var(--orange); transition: right .18s ease; }
.site-nav > a:hover::after, .site-nav > a[aria-current="page"]::after { right: 0; }
.download-button, .guide-button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 10px 22px; border: 2px solid var(--dark); border-radius: 6px; color: var(--dark); font-weight: 900; box-shadow: 4px 4px 0 var(--dark); transition: transform .16s ease, box-shadow .16s ease; }
.download-button { background: var(--orange); }
.download-button.secondary, .guide-button { background: var(--paper); }
.download-button:hover, .guide-button:hover { transform: translate(2px,2px); box-shadow: 2px 2px 0 var(--dark); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); cursor: pointer; }
.menu-toggle span, .menu-toggle::before, .menu-toggle::after { display: block; width: 20px; height: 2px; margin: 4px auto; content: ""; background: var(--dark); }

.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); background: var(--paper-deep); }
.hero::before { position: absolute; inset: 34px 0 auto; height: 4px; content: ""; background: var(--orange); opacity: .35; }
.hero-grid { min-height: 650px; display: grid; grid-template-columns: minmax(0,1.02fr) minmax(400px,.98fr); align-items: center; gap: 64px; padding: 70px 0 58px; }
.eyebrow { margin: 0 0 16px; color: var(--moss); font-size: 14px; font-weight: 900; }
.eyebrow::before { display: inline-block; width: 28px; height: 4px; margin: 0 10px 3px 0; content: ""; background: var(--moss); }
h1 { max-width: 720px; margin-bottom: 20px; font-size: clamp(42px,6vw,72px); }
.hero-copy > p { max-width: 660px; margin: 0; color: #51443d; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero-notes { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 25px 0 0; padding: 0; color: var(--muted); font-size: 14px; list-style: none; }
.hero-notes li::before { margin-right: 7px; content: "\2713"; color: var(--moss); font-weight: 900; }
.hero-visual { position: relative; min-height: 530px; }
.phone-shot { position: absolute; width: min(270px,62%); max-width: 400px; margin: 0; overflow: hidden; border: 8px solid var(--dark); border-radius: 28px; background: var(--white); box-shadow: var(--shadow); }
.phone-shot img { width: 100%; height: auto; }
.phone-shot.primary { top: 0; right: 15%; z-index: 2; }
.phone-shot.secondary-shot { bottom: 0; left: 0; width: min(225px,52%); transform: rotate(-4deg); }
.hero-sticker { position: absolute; right: 0; bottom: 72px; z-index: 3; width: 138px; padding: 15px 14px; border: 2px solid var(--dark); background: var(--moss-soft); color: var(--dark); font-weight: 900; text-align: center; transform: rotate(3deg); }

.trust-strip { border-bottom: 1px solid var(--line); background: var(--dark); color: var(--paper); }
.trust-grid { display: grid; grid-template-columns: repeat(3,1fr); }
.trust-item { padding: 24px 28px; border-left: 1px solid rgba(255,255,255,.17); }
.trust-item:last-child { border-right: 1px solid rgba(255,255,255,.17); }
.trust-item strong { display: block; font-size: 19px; }
.trust-item span { color: #d8c8bd; font-size: 13px; }

.section { padding: 84px 0; }
.section.alt { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--white); }
.section.dark { background: var(--dark); color: var(--paper); }
.section.dark h2, .section.dark h3 { color: var(--paper); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section h2 { max-width: 740px; margin-bottom: 0; font-size: clamp(30px,4vw,48px); }
.chapter-mark { min-width: 88px; padding: 8px 12px; border: 1px solid currentColor; color: var(--moss); font-size: 13px; font-weight: 900; text-align: center; }
.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-item { min-height: 260px; padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); }
.feature-number { display: inline-flex; width: 42px; height: 42px; align-items: center; justify-content: center; margin-bottom: 38px; border: 2px solid var(--dark); border-radius: 50%; background: var(--orange-soft); color: var(--dark); font-weight: 900; }
.feature-item h3 { margin-bottom: 10px; font-size: 21px; }
.feature-item p { margin: 0; color: var(--muted); font-size: 15px; }
.screens-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; align-items: start; }
.screen-figure { margin: 0; }
.screen-figure:nth-child(even) { margin-top: 44px; }
.screen-figure img { width: 100%; max-width: 400px; height: auto; border: 6px solid var(--dark); border-radius: 8px; box-shadow: 8px 8px 0 var(--orange-soft); }
.screen-figure figcaption { padding: 14px 4px 0; color: var(--muted); font-size: 14px; }
.screen-figure strong { display: block; color: var(--ink); font-size: 17px; }
.deep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.deep-card { min-height: 310px; padding: 36px; border: 2px solid var(--paper); border-radius: 8px; }
.deep-card:first-child { background: var(--moss); }
.deep-card:last-child { background: #7b3828; }
.deep-card .chapter-mark { color: var(--paper); }
.deep-card h3 { margin: 42px 0 14px; font-size: 30px; }
.deep-card p { max-width: 520px; margin-bottom: 24px; color: #f3e8df; }
.text-link { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 3px; border-bottom: 2px solid currentColor; font-weight: 900; }
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.review-card { padding: 28px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); }
.review-card blockquote { margin: 0 0 20px; font-size: 16px; }
.review-card cite { color: var(--moss); font-size: 14px; font-style: normal; font-weight: 800; }

.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 23px 0; border: 0; background: transparent; color: var(--dark); font-weight: 900; text-align: left; cursor: pointer; }
.faq-question::after { flex: 0 0 auto; width: 28px; height: 28px; content: "+"; border: 1px solid var(--line); border-radius: 50%; line-height: 25px; text-align: center; }
.faq-question[aria-expanded="true"]::after { content: "\2212"; }
.faq-answer { max-width: 850px; padding: 0 50px 22px 0; color: var(--muted); }
.faq-answer p { margin: 0; }
.final-cta { padding: 76px 0; background: var(--orange); color: var(--dark); }
.cta-wrap { display: flex; align-items: center; justify-content: space-between; gap: 36px; }
.final-cta h2 { margin-bottom: 10px; color: var(--dark); font-size: clamp(30px,4vw,48px); }
.final-cta p { max-width: 700px; margin: 0; }

.site-footer { padding: 46px 0 30px; background: #211a17; color: #d9cec7; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: start; }
.footer-brand { color: var(--paper); }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px 24px; }
.footer-links a:hover { color: var(--orange-soft); }
.disclaimer { margin: 28px 0 0; padding-top: 22px; border-top: 1px solid #4b403b; }
.copyright { margin: 8px 0 0; color: #a89d97; }

.page-hero { border-bottom: 1px solid var(--line); background: var(--paper-deep); }
.page-hero .container { min-height: 390px; display: grid; grid-template-columns: 1fr 300px; align-items: center; gap: 60px; padding-top: 60px; padding-bottom: 60px; }
.page-hero h1 { margin-bottom: 18px; font-size: clamp(38px,5vw,62px); }
.page-hero p { max-width: 720px; margin: 0; color: var(--muted); font-size: 18px; }
.page-index { align-self: stretch; display: flex; flex-direction: column; justify-content: center; padding: 28px; border-left: 5px solid var(--orange); background: var(--white); }
.page-index strong { font-size: 44px; line-height: 1; }
.page-index span { margin-top: 10px; color: var(--muted); }
.article-layout { display: grid; grid-template-columns: minmax(0,1fr) 260px; gap: 64px; align-items: start; }
.article h2 { margin: 54px 0 18px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 32px; }
.article h2:first-child { margin-top: 0; }
.article h3 { margin: 28px 0 10px; font-size: 21px; }
.article p { margin: 0 0 18px; }
.article ul, .article ol { margin: 0 0 24px; padding-left: 22px; }
.article li { margin-bottom: 10px; }
.article-media { display: grid; grid-template-columns: repeat(2,minmax(0,280px)); gap: 18px; margin: 28px 0; }
.article-media figure { margin: 0; }
.article-media img { width: 100%; max-width: 400px; height: auto; border: 5px solid var(--dark); border-radius: 8px; }
.article-media figcaption { padding-top: 8px; color: var(--muted); font-size: 13px; }
.step-list { display: grid; gap: 20px; counter-reset: guide-step; }
.step { position: relative; padding: 28px 28px 28px 82px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); counter-increment: guide-step; }
.step::before { position: absolute; top: 27px; left: 24px; width: 38px; height: 38px; content: counter(guide-step); border-radius: 50%; background: var(--orange); color: var(--dark); font-weight: 900; line-height: 38px; text-align: center; }
.step h3 { margin-top: 0; }
.step p:last-child { margin-bottom: 0; }
.callout { margin: 26px 0; padding: 22px 24px; border-left: 5px solid var(--moss); background: var(--moss-soft); }
.article-nav { position: sticky; top: 100px; padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); }
.article-nav strong { display: block; margin-bottom: 13px; }
.article-nav a { display: block; padding: 8px 0; border-bottom: 1px dashed var(--line); color: var(--muted); font-size: 14px; }
.settings-panel { display: grid; grid-template-columns: 1fr minmax(240px,320px); gap: 30px; align-items: center; margin: 26px 0; padding: 28px; border: 1px solid var(--line); background: var(--white); }
.settings-panel img { width: 100%; max-width: 400px; height: auto; border: 4px solid var(--dark); }
.related-links { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
.related-link { padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--white); }
.related-link strong { display: block; margin-bottom: 8px; color: var(--dark); }
.related-link span { color: var(--muted); font-size: 14px; }

@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .site-nav { position: fixed; inset: 73px 0 auto; display: none; flex-direction: column; align-items: stretch; gap: 2px; padding: 24px 20px 30px; border-bottom: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
  .nav-open .site-nav { display: flex; }
  .site-nav > a:not(.download-button) { padding: 13px 4px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { width: min(560px,100%); margin: 0 auto; }
  .feature-grid { grid-template-columns: repeat(2,1fr); }
  .screens-grid { grid-template-columns: repeat(2,1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .page-hero .container, .article-layout { grid-template-columns: 1fr; }
  .page-index { min-height: 130px; }
  .article-nav { position: static; order: -1; }
}

@media (max-width: 640px) {
  .container { width: min(100% - 28px,1120px); }
  .nav-wrap { min-height: 64px; }
  .brand { font-size: 18px; }
  .brand img { width: 38px; height: 38px; }
  .site-nav { top: 65px; }
  .hero-grid { min-height: auto; padding-top: 58px; }
  h1 { font-size: 42px; }
  .hero-copy > p, .page-hero p { font-size: 16px; }
  .hero-visual { min-height: 435px; }
  .phone-shot.primary { right: 5%; }
  .phone-shot.secondary-shot { left: 1%; }
  .hero-sticker { right: 0; bottom: 24px; width: 116px; font-size: 13px; }
  .trust-grid, .feature-grid, .deep-grid, .screens-grid, .footer-grid, .related-links { grid-template-columns: 1fr; }
  .trust-item, .trust-item:last-child { border: 0; border-bottom: 1px solid rgba(255,255,255,.17); }
  .section { padding: 62px 0; }
  .section-heading { align-items: start; flex-direction: column; gap: 16px; }
  .screens-grid { width: min(320px,100%); margin: 0 auto; }
  .screen-figure:nth-child(even) { margin-top: 0; }
  .cta-wrap { align-items: flex-start; flex-direction: column; }
  .footer-links { justify-content: flex-start; }
  .page-hero .container { min-height: 340px; gap: 28px; padding-top: 48px; padding-bottom: 48px; }
  .page-hero h1 { font-size: 40px; }
  .article-media { grid-template-columns: 1fr; width: min(320px,100%); }
  .settings-panel { grid-template-columns: 1fr; padding: 20px; }
  .step { padding: 74px 22px 24px; }
  .step::before { top: 20px; left: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}