:root {
  --ink: #17191f;
  --ink-soft: #2b2e37;
  --paper: #f7f8fb;
  --white: #ffffff;
  --lime: #b9f34a;
  --coral: #ff6b5f;
  --cyan: #58d5df;
  --muted: #686d79;
  --line: #dfe2e8;
  --shadow: 0 18px 45px rgba(23, 25, 31, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

[id] {
  scroll-margin-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

button {
  font: inherit;
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(23, 25, 31, 0.96);
  color: var(--white);
  backdrop-filter: blur(14px);
}

.nav-shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: max-content;
  font-size: 20px;
  font-weight: 800;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
  font-weight: 650;
}

.site-nav > a:not(.download-button) {
  position: relative;
  padding-block: 22px;
  color: #d8dbe2;
}

.site-nav > a:not(.download-button)::after {
  position: absolute;
  right: 0;
  bottom: 14px;
  left: 0;
  height: 2px;
  background: var(--lime);
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.site-nav > a:hover::after,
.site-nav > a[aria-current="page"]::after {
  transform: scaleX(1);
}

.download-button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--lime);
  border-radius: 6px;
  background: var(--lime);
  color: var(--ink);
  font-weight: 850;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.download-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(185, 243, 74, 0.24);
}

.download-button.dark {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  background: var(--white);
  transition: transform 180ms ease, opacity 180ms ease;
}

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

.hero-grid {
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.82fr);
  align-items: center;
  gap: 70px;
  padding-block: 54px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--lime);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 26px;
  height: 3px;
  background: currentColor;
  content: "";
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: 68px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero h1 + p {
  max-width: 660px;
  margin: 24px 0 0;
  color: #d5d8df;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
}

.text-link {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  border-bottom: 2px solid var(--coral);
  color: var(--white);
  font-weight: 750;
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 28px 0 0;
  padding: 0;
  color: #aeb3bd;
  font-size: 14px;
  list-style: none;
}

.hero-notes li::before {
  margin-right: 7px;
  color: var(--cyan);
  content: "●";
  font-size: 9px;
}

.hero-visual {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual::before,
.hero-visual::after {
  position: absolute;
  width: 64%;
  height: 74%;
  border: 1px solid rgba(255, 255, 255, 0.16);
  content: "";
}

.hero-visual::before {
  right: 0;
  top: 6%;
  background: var(--coral);
}

.hero-visual::after {
  bottom: 5%;
  left: 1%;
  background: var(--cyan);
}

.hero-visual img {
  position: relative;
  z-index: 2;
  width: auto;
  max-width: 260px;
  height: 520px;
  margin: auto 0;
  border: 7px solid #30333b;
  border-radius: 28px;
  object-fit: cover;
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.42);
}

.hero-visual img:last-child {
  width: auto;
  max-width: 205px;
  height: 456px;
  margin-left: -46px;
  transform: translateY(34px);
}

.stats-band {
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat {
  min-height: 126px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px 28px;
  border-right: 1px solid var(--line);
}

.stat:first-child {
  border-left: 1px solid var(--line);
}

.stat strong {
  font-size: 25px;
  line-height: 1.2;
}

.stat span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 92px 0;
}

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

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

.section-head {
  max-width: 740px;
  margin-bottom: 44px;
}

.section-head .kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0;
  font-size: 46px;
  line-height: 1.2;
  letter-spacing: 0;
}

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

.feature-item {
  min-height: 260px;
  padding: 30px;
  background: var(--white);
}

.feature-number {
  display: inline-grid;
  width: 44px;
  height: 44px;
  place-items: center;
  margin-bottom: 36px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--lime);
  font-weight: 850;
}

.feature-item:nth-child(2) .feature-number,
.feature-item:nth-child(5) .feature-number {
  background: var(--coral);
  color: var(--white);
}

.feature-item h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

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

.screen-row {
  display: grid;
  grid-auto-columns: minmax(220px, 282px);
  grid-auto-flow: column;
  gap: 24px;
  overflow-x: auto;
  padding: 4px 4px 28px;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--coral) rgba(255, 255, 255, 0.12);
}

.screen-figure {
  margin: 0;
  scroll-snap-align: start;
}

.screen-button {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.app-shot {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 6px solid #30333b;
  border-radius: 24px;
  box-shadow: 0 24px 44px rgba(0, 0, 0, 0.34);
}

.screen-figure figcaption {
  padding-top: 14px;
  color: #b8bdc7;
  font-size: 14px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 70px;
  align-items: start;
}

.path-list {
  border-top: 1px solid var(--line);
}

.path-item {
  display: grid;
  grid-template-columns: 70px 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.path-item span {
  color: var(--coral);
  font-weight: 850;
}

.path-item h3 {
  margin: 0 0 4px;
  font-size: 20px;
}

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

.path-item a {
  font-size: 24px;
  font-weight: 800;
}

.quote-panel {
  position: sticky;
  top: 104px;
  padding: 38px;
  border-left: 7px solid var(--lime);
  background: var(--ink);
  color: var(--white);
}

.quote-panel blockquote {
  margin: 0;
  font-size: 22px;
  line-height: 1.8;
}

.quote-panel cite {
  display: block;
  margin-top: 20px;
  color: var(--lime);
  font-size: 14px;
  font-style: normal;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  padding: 28px;
  border: 1px solid #383b44;
  border-radius: var(--radius);
  background: var(--ink-soft);
}

.review-card p {
  margin: 0 0 20px;
  color: #e4e6eb;
}

.review-card strong {
  color: var(--lime);
  font-size: 14px;
}

.cta-band {
  padding: 58px 0;
  background: var(--lime);
}

.cta-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.cta-shell h2 {
  margin: 0;
  font-size: 42px;
  line-height: 1.2;
}

.cta-shell .download-button {
  min-width: 150px;
}

.site-footer {
  padding: 46px 0 28px;
  background: #101116;
  color: #c5c8d0;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: start;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 14px;
}

.disclaimer {
  max-width: 780px;
  margin: 26px 0 0;
  color: #8f949f;
  font-size: 13px;
}

.copyright {
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid #292b33;
  color: #777c87;
  font-size: 13px;
}

.inner-hero {
  padding: 78px 0 66px;
  background: var(--ink);
  color: var(--white);
}

.inner-hero .eyebrow {
  margin-bottom: 14px;
}

.inner-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: 58px;
  line-height: 1.15;
}

.inner-hero p {
  max-width: 760px;
  margin: 20px 0 0;
  color: #c9cdd5;
  font-size: 17px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 62px;
  align-items: start;
}

.article-body h2 {
  margin: 64px 0 22px;
  font-size: 30px;
  line-height: 1.3;
}

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

.article-body p {
  margin: 0 0 18px;
  color: #454a55;
}

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

.steps {
  display: grid;
  gap: 22px;
}

.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.step-index {
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border-radius: 50%;
  background: var(--coral);
  color: var(--white);
  font-weight: 850;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.step p {
  margin: 0;
}

.inline-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 260px);
  gap: 28px;
  align-items: center;
  margin: 28px 0;
  padding: 28px;
  background: #eceff3;
}

.inline-visual img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 5px solid var(--ink);
  border-radius: 22px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 14px 16px 14px 44px;
  border-left: 4px solid var(--cyan);
  background: var(--white);
}

.check-list li::before {
  margin-left: -26px;
  margin-right: 10px;
  color: #17828b;
  content: "✓";
  font-weight: 900;
}

.article-aside {
  position: sticky;
  top: 98px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.article-aside strong {
  display: block;
  margin-bottom: 14px;
  font-size: 18px;
}

.article-aside a:not(.download-button) {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.article-aside .download-button {
  width: 100%;
  margin-top: 22px;
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.feature-detail {
  padding: 28px;
  border-top: 5px solid var(--lime);
  background: var(--white);
}

.feature-detail:nth-child(2n) {
  border-top-color: var(--coral);
}

.feature-detail h3 {
  margin: 0 0 10px;
}

.feature-detail p {
  margin: 0;
}

.faq-list {
  border-top: 1px solid var(--line);
}

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

.faq-question {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 32px;
  gap: 20px;
  align-items: center;
  padding: 22px 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
  text-align: left;
}

.faq-question span:last-child {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 240ms ease;
}

.faq-answer p {
  margin: 0;
  padding: 0 52px 24px 0;
}

.faq-item.open .faq-answer {
  max-height: 420px;
}

.faq-item.open .faq-question span:last-child {
  background: var(--coral);
}

.notice {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 5px solid var(--coral);
  background: #fff1ef;
  color: #5b322e;
}

.preview-dialog {
  width: min(92vw, 430px);
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: #24262d;
  box-shadow: var(--shadow);
}

.preview-dialog::backdrop {
  background: rgba(8, 9, 12, 0.82);
}

.preview-dialog img {
  width: 100%;
  max-width: 400px;
  height: auto;
  margin-inline: auto;
}

.dialog-close {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 14px 20px 22px;
    border-top: 1px solid #343741;
    background: var(--ink);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav > a:not(.download-button) {
    padding: 13px 0;
  }

  .site-nav > a:not(.download-button)::after {
    bottom: 7px;
  }

  .hero-grid {
    min-height: 0;
    grid-template-columns: 1fr 340px;
    gap: 30px;
  }

  .hero-visual {
    min-height: 450px;
  }

  .hero-visual img {
    height: 430px;
  }

  .hero-visual img:last-child {
    display: none;
  }

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

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

  .path-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .quote-panel,
  .article-aside {
    position: static;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .nav-shell {
    min-height: 64px;
  }

  .site-nav {
    top: 64px;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 38px 0 30px;
  }

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

  .hero h1 + p {
    margin-top: 16px;
    font-size: 16px;
    line-height: 1.75;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .hero-notes {
    margin-top: 18px;
  }

  .hero-visual {
    min-height: 280px;
  }

  .hero-visual::before,
  .hero-visual::after {
    width: 52%;
    height: 78%;
  }

  .hero-visual img {
    width: auto;
    height: 280px;
    border-width: 5px;
    border-radius: 20px;
  }

  .stats-grid,
  .feature-grid,
  .review-grid,
  .feature-detail-grid {
    grid-template-columns: 1fr;
  }

  .stat,
  .stat:first-child {
    min-height: 96px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }

  .section {
    padding: 66px 0;
  }

  .section-head {
    margin-bottom: 30px;
  }

  .feature-item {
    min-height: 0;
  }

  .feature-number {
    margin-bottom: 22px;
  }

  .path-item {
    grid-template-columns: 44px 1fr auto;
    gap: 12px;
  }

  .cta-shell,
  .footer-top {
    align-items: stretch;
    flex-direction: column;
    display: flex;
  }

  .cta-shell .download-button {
    width: 100%;
  }

  .inner-hero {
    padding: 56px 0 48px;
  }

  .inner-hero h1 {
    font-size: 38px;
  }

  .step {
    grid-template-columns: 1fr;
  }

  .inline-visual {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .inline-visual img {
    max-width: 260px;
    margin-inline: auto;
  }
}

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