:root {
  --ink: #171a1f;
  --muted: #60666f;
  --paper: #f7f8f6;
  --white: #ffffff;
  --yellow: #ffd338;
  --yellow-deep: #e7ad00;
  --teal: #087d72;
  --teal-soft: #dff4f0;
  --coral: #e85d4a;
  --line: #dfe2df;
  --shadow: 0 16px 40px rgba(23, 26, 31, 0.1);
  --radius: 8px;
  --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", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

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

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--white);
  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;
  border-bottom: 1px solid rgba(23, 26, 31, 0.1);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 900;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

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

.site-nav a {
  padding: 9px 14px;
  color: #454a52;
  font-size: 14px;
  font-weight: 700;
}

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

.button,
.site-nav .nav-download {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 15px;
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

.button-dark {
  color: var(--white);
  background: var(--ink);
  border-color: var(--white);
  box-shadow: 4px 4px 0 var(--yellow);
}

.button-dark:hover {
  color: var(--white);
  box-shadow: 2px 2px 0 var(--yellow);
}

.button-quiet {
  background: var(--white);
}

.hero {
  position: relative;
  min-height: 610px;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  content: "78";
  position: absolute;
  right: 2vw;
  bottom: -130px;
  color: rgba(255, 255, 255, 0.035);
  font-size: 430px;
  font-weight: 900;
  line-height: 1;
}

.hero-inner {
  position: relative;
  min-height: 610px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 430px;
  align-items: center;
  gap: 70px;
  padding-block: 68px 54px;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 660px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--yellow);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.eyebrow::before {
  content: "";
  width: 30px;
  height: 3px;
  background: currentColor;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(46px, 7vw, 82px);
  font-weight: 900;
}

.hero .lead {
  max-width: 690px;
  margin: 0 0 28px;
  color: #e7e9e8;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.platform-note {
  color: #bbc0c4;
  font-size: 13px;
}

.hero-visual {
  position: relative;
  z-index: 1;
  align-self: end;
  display: flex;
  justify-content: center;
}

.hero-visual::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  top: 100px;
  border-radius: 50%;
  background: var(--teal);
}

.hero-visual img {
  position: relative;
  width: min(330px, 100%);
  max-width: 400px;
  max-height: 530px;
  object-fit: cover;
  object-position: top;
  border: 7px solid #080a0d;
  border-bottom: 0;
  border-radius: 28px 28px 0 0;
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.45);
}

.hero-label {
  position: absolute;
  right: -10px;
  top: 100px;
  z-index: 3;
  padding: 9px 13px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--ink);
  font-size: 13px;
  font-weight: 900;
  transform: rotate(4deg);
}

.signal-strip {
  background: var(--yellow);
  border-bottom: 2px solid var(--ink);
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.signal-item {
  min-height: 112px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 32px;
  border-left: 1px solid rgba(23, 26, 31, 0.3);
}

.signal-item:last-child {
  border-right: 1px solid rgba(23, 26, 31, 0.3);
}

.signal-number {
  font-size: 31px;
  font-weight: 900;
}

.signal-copy strong,
.signal-copy span {
  display: block;
}

.signal-copy strong {
  font-size: 15px;
}

.signal-copy span {
  font-size: 12px;
}

.section {
  padding-block: 92px;
}

.section-white {
  background: var(--white);
}

.section-ink {
  color: var(--white);
  background: var(--ink);
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.section-ink .section-kicker {
  color: var(--yellow);
}

.section h2 {
  max-width: 760px;
  margin-bottom: 38px;
  font-size: clamp(30px, 4.3vw, 48px);
  font-weight: 900;
}

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

.feature-item {
  min-height: 250px;
  padding: 30px;
  background: var(--white);
}

.feature-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 34px;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--yellow);
  font-weight: 900;
}

.feature-item:nth-child(2n) .feature-mark {
  color: var(--white);
  background: var(--teal);
}

.feature-item:nth-child(3n) .feature-mark {
  color: var(--white);
  background: var(--coral);
}

.feature-item h3 {
  margin-bottom: 12px;
  font-size: 20px;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.screens-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: start;
  gap: 22px;
}

.screen-figure {
  margin: 0;
}

.screen-figure:nth-child(even) {
  margin-top: 52px;
}

.screen-figure img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 479 / 798;
  object-fit: cover;
  border: 5px solid #080a0d;
  border-radius: 22px;
  background: #f1f2f2;
}

.screen-figure figcaption {
  margin-top: 12px;
  color: #c8cccf;
  font-size: 13px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 22px;
}

.path-card {
  min-height: 330px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 36px;
  border: 2px solid var(--ink);
  background: var(--yellow);
}

.path-card:nth-child(2) {
  color: var(--white);
  background: var(--teal);
}

.path-index {
  align-self: flex-start;
  padding: 4px 9px;
  border: 1px solid currentColor;
  font-size: 12px;
  font-weight: 900;
}

.path-card h3 {
  max-width: 460px;
  margin: 50px 0 12px;
  font-size: 31px;
}

.path-card p {
  max-width: 530px;
  margin: 0 0 24px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 5px;
}

.review-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 56px;
  align-items: start;
}

.rating-block {
  position: sticky;
  top: 110px;
}

.rating-value {
  display: block;
  font-size: 76px;
  font-weight: 900;
  line-height: 1;
}

.rating-stars {
  color: var(--yellow-deep);
  font-size: 20px;
}

.rating-block small {
  display: block;
  margin-top: 10px;
  color: var(--muted);
}

.reviews {
  border-top: 2px solid var(--ink);
}

.review {
  margin: 0;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.review blockquote {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
}

.review cite {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

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

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 900;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  font-size: 22px;
  line-height: 1;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
  color: var(--white);
  background: var(--teal);
}

.faq-answer {
  max-width: 850px;
  padding: 0 54px 22px 0;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.download-band {
  padding-block: 70px;
  color: var(--white);
  background: var(--teal);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.download-band h2 {
  margin-bottom: 8px;
  font-size: clamp(30px, 4vw, 48px);
}

.download-band .band-note {
  display: block;
  margin: 0;
  color: #d9f2ee;
}

.site-footer {
  padding-block: 42px 26px;
  color: #c5c9cc;
  background: #101317;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 50px;
  align-items: start;
}

.footer-brand {
  color: var(--white);
}

.footer-brand p {
  max-width: 640px;
  margin: 16px 0 0;
  font-size: 13px;
}

.footer-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.footer-nav a:hover {
  color: var(--yellow);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid #30343a;
  font-size: 12px;
}

.page-hero {
  color: var(--white);
  background: var(--ink);
}

.page-hero-inner {
  min-height: 410px;
  display: grid;
  grid-template-columns: 1fr 280px;
  align-items: center;
  gap: 60px;
  padding-block: 70px;
}

.page-hero h1 {
  max-width: 820px;
  font-size: clamp(40px, 6vw, 68px);
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: #d8dcde;
  font-size: 17px;
}

.page-emblem {
  width: 230px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  justify-self: end;
  border: 3px solid var(--white);
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 14px 14px 0 var(--teal);
  font-size: 72px;
  font-weight: 900;
}

.steps {
  counter-reset: guide-step;
  border-top: 2px solid var(--ink);
}

.step {
  counter-increment: guide-step;
  display: grid;
  grid-template-columns: 90px 0.8fr 1.2fr;
  gap: 34px;
  padding: 42px 0;
  border-bottom: 1px solid var(--line);
}

.step::before {
  content: counter(guide-step, decimal-leading-zero);
  color: var(--teal);
  font-size: 34px;
  font-weight: 900;
}

.step h3 {
  margin: 6px 0 0;
  font-size: 24px;
}

.step-content p {
  margin: 0 0 12px;
  color: var(--muted);
}

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

.step-note {
  padding: 12px 14px;
  border-left: 4px solid var(--yellow-deep);
  background: #fff9dc;
  color: #494b45;
  font-size: 14px;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.check-item {
  position: relative;
  min-height: 96px;
  padding: 20px 20px 20px 58px;
  border: 1px solid var(--line);
  background: var(--white);
}

.check-item::before {
  content: "✓";
  position: absolute;
  top: 21px;
  left: 20px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--teal);
  font-size: 14px;
  font-weight: 900;
}

.check-item strong,
.check-item span {
  display: block;
}

.check-item span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 64px;
  align-items: start;
}

.guide-aside {
  position: sticky;
  top: 110px;
  padding: 26px;
  color: var(--white);
  background: var(--teal);
}

.guide-aside h3 {
  font-size: 22px;
}

.guide-aside ol {
  margin: 0;
  padding-left: 22px;
}

.guide-aside li {
  margin-bottom: 10px;
}

.guide-aside img {
  width: 100%;
  max-width: 400px;
  margin-top: 24px;
  border: 4px solid var(--ink);
  border-radius: 18px;
}

.function-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.function-nav a {
  padding: 8px 13px;
  border: 1px solid var(--ink);
  background: var(--white);
  font-size: 13px;
  font-weight: 800;
}

.function-nav a:hover {
  color: var(--white);
  background: var(--teal);
}

.function-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.function-card {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--white);
}

.function-card:nth-child(3n + 1) {
  border-top: 5px solid var(--yellow-deep);
}

.function-card:nth-child(3n + 2) {
  border-top: 5px solid var(--teal);
}

.function-card:nth-child(3n) {
  border-top: 5px solid var(--coral);
}

.function-card h3 {
  margin-bottom: 13px;
  font-size: 21px;
}

.function-card p {
  margin: 0;
  color: var(--muted);
}

.notice {
  padding: 26px;
  border: 2px solid var(--ink);
  background: var(--yellow);
}

.notice h3 {
  margin-bottom: 8px;
}

.notice p {
  margin: 0;
}

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

.related-link {
  min-height: 150px;
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--white);
}

.related-link strong,
.related-link span {
  display: block;
}

.related-link strong {
  margin-bottom: 10px;
  font-size: 19px;
}

.related-link span {
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 30px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screens-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screen-figure:nth-child(even) {
    margin-top: 30px;
  }

  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-aside {
    position: static;
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 24px;
  }

  .guide-aside img {
    margin-top: 0;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .header-inner {
    min-height: 64px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    padding: 14px;
    border-top: 1px solid var(--line);
    border-bottom: 2px solid var(--ink);
    background: var(--white);
  }

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

  .site-nav a {
    padding: 12px 10px;
  }

  .site-nav .nav-download {
    margin-top: 6px;
  }

  .hero,
  .hero-inner {
    min-height: auto;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    padding-block: 56px 0;
  }

  h1 {
    font-size: 46px;
  }

  .hero .lead {
    font-size: 16px;
  }

  .hero-visual {
    width: min(330px, 86vw);
    margin: 10px auto 0;
  }

  .hero-visual::before {
    width: 290px;
    height: 290px;
  }

  .hero-visual img {
    max-height: 440px;
  }

  .hero-label {
    right: -4px;
  }

  .signal-grid,
  .feature-grid,
  .path-grid,
  .review-grid,
  .function-list,
  .related-links,
  .check-grid,
  .footer-grid,
  .page-hero-inner {
    grid-template-columns: 1fr;
  }

  .signal-item {
    min-height: 88px;
    padding: 18px 16px;
    border-left: 0;
    border-bottom: 1px solid rgba(23, 26, 31, 0.25);
  }

  .signal-item:last-child {
    border-right: 0;
    border-bottom: 0;
  }

  .section {
    padding-block: 68px;
  }

  .section h2 {
    margin-bottom: 28px;
    font-size: 34px;
  }

  .feature-item {
    min-height: auto;
  }

  .screens-grid {
    gap: 14px;
  }

  .screen-figure:nth-child(even) {
    margin-top: 22px;
  }

  .screen-figure figcaption {
    font-size: 12px;
  }

  .path-card {
    min-height: 290px;
    padding: 26px;
  }

  .path-card h3 {
    margin-top: 36px;
    font-size: 26px;
  }

  .rating-block {
    position: static;
  }

  .download-band-inner,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-nav {
    flex-wrap: wrap;
  }

  .page-hero-inner {
    min-height: auto;
    padding-block: 58px;
  }

  .page-hero h1 {
    font-size: 42px;
  }

  .page-emblem {
    width: 150px;
    justify-self: start;
    font-size: 48px;
  }

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

  .step-content {
    grid-column: 2;
  }

  .guide-aside {
    display: block;
  }

  .guide-aside img {
    max-width: 250px;
    margin: 24px auto 0;
  }
}

@media (max-width: 420px) {
  .screens-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .platform-note {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}