:root {
  --ink: #2d241f;
  --ink-soft: #64584f;
  --cream: #fff7e8;
  --paper: #fffdf8;
  --yellow: #ffc928;
  --orange: #f28c52;
  --green: #6e9b45;
  --pink: #f3a9a1;
  --line: #2d241f;
  --shadow: 6px 6px 0 #2d241f;
  --container: 1160px;
}

* {
  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, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
input {
  font: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(2.5rem, 6vw, 5.4rem);
  font-weight: 900;
}

h2 {
  margin-bottom: 30px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 900;
}

h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
}

p {
  margin-bottom: 18px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 9px 14px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 248, 0.96);
  border-bottom: 2px solid var(--line);
  transition: box-shadow 180ms ease;
}

.site-header.is-scrolled {
  box-shadow: 0 4px 0 rgba(45, 36, 31, 0.08);
}

.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  font-size: 1.12rem;
  font-weight: 900;
}

.brand img {
  width: 44px;
  height: 44px;
  border: 2px solid var(--line);
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a:not(.button) {
  padding: 10px 14px;
  border-bottom: 3px solid transparent;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-bottom-color: var(--yellow);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: currentColor;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 21px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 6px;
  box-shadow: 3px 3px 0 var(--ink);
  font-weight: 900;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.button:hover {
  box-shadow: 1px 1px 0 var(--ink);
  transform: translate(2px, 2px);
}

.button:focus-visible,
.text-link:focus-visible,
.site-nav a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.button-dark {
  color: #fff;
  background: var(--ink);
  box-shadow: 3px 3px 0 var(--orange);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #355d22;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding: 5px 11px;
  background: var(--ink);
  color: #fff;
  border-radius: 3px;
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.hero {
  min-height: 680px;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: var(--cream);
  border-bottom: 2px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 80px;
  padding-block: 60px;
}

.hero-copy p {
  max-width: 650px;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.hero h1 {
  font-size: clamp(2.8rem, 5.3vw, 4.65rem);
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin: 30px 0 34px;
}

.quick-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: 0.92rem;
  font-weight: 800;
}

.quick-facts li::before {
  content: "";
  width: 9px;
  height: 9px;
  display: inline-block;
  margin-right: 8px;
  background: var(--green);
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.hero-visual {
  position: relative;
  min-height: 560px;
}

.phone-shell {
  position: absolute;
  top: 10px;
  left: 50%;
  width: min(300px, 72vw);
  padding: 12px;
  background: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 34px;
  box-shadow: 14px 14px 0 var(--orange);
  transform: translateX(-50%) rotate(2deg);
}

.phone-shell::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 50%;
  width: 78px;
  height: 15px;
  background: var(--ink);
  border-radius: 0 0 10px 10px;
  transform: translateX(-50%);
}

.phone-shell img {
  width: 100%;
  max-width: 400px;
  border-radius: 23px;
}

.sticky-note {
  position: absolute;
  z-index: 2;
  width: 176px;
  padding: 15px 17px;
  background: var(--yellow);
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  font-weight: 900;
}

.sticky-note.one {
  top: 72px;
  left: 0;
  transform: rotate(-5deg);
}

.sticky-note.two {
  right: -8px;
  bottom: 70px;
  background: var(--pink);
  transform: rotate(4deg);
}

.ticker {
  overflow: hidden;
  color: #fff;
  background: var(--ink);
  border-bottom: 2px solid var(--line);
}

.ticker-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-block: 17px;
  font-size: 0.95rem;
  font-weight: 900;
}

.ticker span {
  white-space: nowrap;
}

.ticker span::before {
  content: "#";
  margin-right: 6px;
  color: var(--yellow);
}

.section {
  padding-block: 92px;
}

.section-alt {
  background: var(--cream);
  border-block: 2px solid var(--line);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 34px;
}

.section-head h2 {
  max-width: 720px;
  margin-bottom: 0;
}

.feature-ledger {
  border-top: 2px solid var(--line);
}

.feature-row {
  display: grid;
  grid-template-columns: 72px minmax(180px, 0.7fr) minmax(0, 1.3fr);
  gap: 30px;
  align-items: start;
  padding-block: 30px;
  border-bottom: 2px solid var(--line);
}

.feature-index {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 50%;
  font-weight: 900;
}

.feature-row p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
  align-items: end;
}

.screen-item {
  margin: 0;
}

.screen-item:nth-child(even) {
  transform: translateY(24px);
}

.screen-frame {
  padding: 9px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.screen-frame img {
  width: 100%;
  max-width: 400px;
  margin-inline: auto;
  border-radius: 4px;
}

.screen-item figcaption {
  padding-top: 17px;
  font-size: 0.9rem;
  font-weight: 800;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 2px solid var(--line);
}

.path-step {
  min-height: 270px;
  padding: 32px;
  background: var(--paper);
  border-right: 2px solid var(--line);
}

.path-step:last-child {
  border-right: 0;
}

.path-number {
  display: block;
  margin-bottom: 40px;
  color: var(--orange);
  font-size: 2.6rem;
  font-weight: 900;
}

.path-step p {
  margin-bottom: 22px;
  color: var(--ink-soft);
}

.quote-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 18px;
}

.quote {
  min-height: 220px;
  margin: 0;
  padding: 30px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 6px;
}

.quote:first-child {
  background: var(--yellow);
}

.quote p {
  font-size: 1.04rem;
  font-weight: 700;
}

.quote cite {
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-style: normal;
  font-weight: 800;
}

.faq-list {
  border-top: 2px solid var(--line);
}

.faq-list details {
  border-bottom: 2px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 23px 56px 23px 0;
  cursor: pointer;
  list-style: none;
  font-size: 1.05rem;
  font-weight: 900;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  top: 17px;
  right: 4px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 50%;
  font-size: 1.4rem;
}

.faq-list details[open] summary::after {
  content: "-";
  background: var(--pink);
}

.faq-answer {
  max-width: 850px;
  padding: 0 56px 22px 0;
  color: var(--ink-soft);
}

.download-band {
  padding-block: 62px;
  background: var(--green);
  border-top: 2px solid var(--line);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.download-band h2 {
  max-width: 720px;
  margin-bottom: 8px;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.download-band .download-detail {
  margin-bottom: 0;
  color: #1e3514;
  font-weight: 700;
}

.site-footer {
  padding-block: 42px 28px;
  color: #eee9df;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 42px;
  align-items: start;
}

.footer-brand {
  color: #fff;
}

.footer-brand img {
  border-color: #fff;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-weight: 800;
}

.footer-note {
  max-width: 820px;
  margin: 28px 0 0;
  color: #cfc6ba;
  font-size: 0.86rem;
}

.copyright {
  margin: 12px 0 0;
  color: #afa397;
  font-size: 0.82rem;
}

.subhero {
  padding-block: 78px 64px;
  background: var(--yellow);
  border-bottom: 2px solid var(--line);
}

.subhero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 70px;
  align-items: end;
}

.subhero h1 {
  max-width: 860px;
  margin-bottom: 18px;
  font-size: clamp(2.3rem, 5vw, 4.5rem);
}

.subhero p {
  max-width: 700px;
  margin-bottom: 0;
  color: #4f3d1a;
  font-size: 1.05rem;
  font-weight: 700;
}

.crumbs {
  margin-bottom: 18px;
  font-size: 0.86rem;
  font-weight: 800;
}

.crumbs a {
  border-bottom: 1px solid currentColor;
}

.subhero-stamp {
  justify-self: end;
  width: 210px;
  padding: 30px 22px;
  background: var(--paper);
  border: 3px solid var(--line);
  border-radius: 50%;
  text-align: center;
  transform: rotate(5deg);
}

.subhero-stamp strong {
  display: block;
  font-size: 1.5rem;
}

.subhero-stamp span {
  font-size: 0.82rem;
  font-weight: 800;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 70px;
  align-items: start;
}

.article-content h2 {
  margin-top: 70px;
  margin-bottom: 24px;
  font-size: clamp(1.8rem, 3.5vw, 2.7rem);
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  margin-top: 30px;
}

.article-content p,
.article-content li {
  color: var(--ink-soft);
}

.article-content strong {
  color: var(--ink);
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: guide-step;
}

.guide-step {
  position: relative;
  padding: 0 0 42px 82px;
  border-left: 2px solid var(--line);
  counter-increment: guide-step;
}

.guide-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.guide-step::before {
  content: counter(guide-step, decimal-leading-zero);
  position: absolute;
  top: -4px;
  left: -28px;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 900;
}

.guide-step h3 {
  margin-top: 0;
}

.guide-step p:last-child {
  margin-bottom: 0;
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 16px 18px;
  background: var(--cream);
  border-left: 5px solid var(--green);
}

.article-aside {
  position: sticky;
  top: 104px;
}

.aside-panel {
  padding: 22px;
  background: var(--cream);
  border: 2px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.aside-panel + .aside-panel {
  margin-top: 26px;
}

.aside-panel h2,
.aside-panel h3 {
  margin-bottom: 16px;
  font-size: 1.12rem;
}

.aside-panel ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

.aside-panel li + li {
  margin-top: 10px;
}

.aside-panel a:not(.button) {
  border-bottom: 1px solid var(--ink);
  font-weight: 800;
}

.aside-screen {
  margin: 0 0 18px;
}

.aside-screen img {
  width: 100%;
  max-width: 400px;
  margin-inline: auto;
  border: 2px solid var(--line);
  border-radius: 5px;
}

.aside-screen figcaption {
  margin-top: 9px;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.tip-box {
  margin-block: 26px;
  padding: 20px 22px;
  background: var(--yellow);
  border: 2px solid var(--line);
  border-radius: 5px;
}

.tip-box p:last-child {
  margin-bottom: 0;
}

.feature-chapters {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.feature-chapter {
  padding: 25px;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 6px;
}

.feature-chapter:nth-child(2),
.feature-chapter:nth-child(5) {
  background: var(--cream);
}

.feature-chapter:nth-child(3) {
  background: var(--yellow);
}

.feature-chapter p:last-child {
  margin-bottom: 0;
}

.related-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 70px;
}

.related-item {
  padding: 24px;
  border: 2px solid var(--line);
  border-radius: 6px;
}

.related-item:first-child {
  background: var(--pink);
}

.related-item:last-child {
  background: var(--green);
}

.related-item p {
  margin-bottom: 14px;
  color: #2d241f;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 35px;
  }

  .sticky-note {
    display: none;
  }

  .screen-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 42px 22px;
  }

  .screen-item:nth-child(even) {
    transform: none;
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 35px;
  }
}

@media (max-width: 760px) {
  h1 {
    font-size: 2.7rem;
  }

  h2 {
    font-size: 2rem;
  }

  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 74px 0 auto 0;
    display: none;
    padding: 18px 20px 26px;
    background: var(--paper);
    border-bottom: 2px solid var(--line);
    box-shadow: 0 12px 0 rgba(45, 36, 31, 0.12);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a:not(.button) {
    padding: 12px 4px;
  }

  .site-nav .button {
    margin-top: 8px;
  }

  .hero {
    min-height: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-block: 42px 0;
  }

  .hero-visual {
    min-height: 250px;
    overflow: hidden;
  }

  .phone-shell {
    width: min(280px, 78vw);
  }

  .ticker-inner {
    justify-content: flex-start;
    overflow-x: auto;
  }

  .section {
    padding-block: 68px;
  }

  .section-head {
    display: block;
  }

  .section-head .text-link {
    margin-top: 16px;
  }

  .feature-row {
    grid-template-columns: 58px 1fr;
    gap: 18px;
  }

  .feature-row p {
    grid-column: 2;
  }

  .path-grid,
  .quote-grid,
  .download-band-inner,
  .footer-grid,
  .subhero-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .path-step {
    min-height: 0;
    border-right: 0;
    border-bottom: 2px solid var(--line);
  }

  .path-step:last-child {
    border-bottom: 0;
  }

  .download-band-inner {
    display: grid;
  }

  .subhero {
    padding-block: 58px 48px;
  }

  .subhero h1 {
    font-size: 2.55rem;
  }

  .subhero-stamp {
    display: none;
  }

  .article-aside {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .aside-panel + .aside-panel {
    margin-top: 0;
  }

  .feature-chapters {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .brand span {
    font-size: 1rem;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    margin-block: 22px;
  }

  .hero-actions .button,
  .download-band .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 225px;
  }

  .screen-grid,
  .check-list,
  .related-strip,
  .article-aside {
    grid-template-columns: 1fr;
  }

  .feature-row {
    grid-template-columns: 48px 1fr;
  }

  .feature-index {
    width: 42px;
    height: 42px;
  }

  .guide-step {
    padding-left: 56px;
  }

  .guide-step::before {
    left: -23px;
    width: 44px;
    height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}