:root {
  --ink: #1d2330;
  --muted: #606979;
  --paper: #ffffff;
  --mist: #f4f6f8;
  --coral: #ff5c74;
  --coral-dark: #e94761;
  --aqua: #35c6d4;
  --gold: #ffc857;
  --line: #dfe4e8;
  --shadow: 0 18px 48px rgba(29, 35, 48, 0.12);
  --max: 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;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}

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

.container {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a:not(.button) {
  color: #444d5c;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:not(.button):hover,
.site-nav a[aria-current="page"]:not(.button) {
  color: var(--coral-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--ink);
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--coral);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(255, 92, 116, 0.25);
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  background: var(--coral-dark);
  box-shadow: 0 12px 28px rgba(255, 92, 116, 0.34);
  transform: translateY(-2px);
}

.button:focus-visible,
.menu-toggle:focus-visible,
.faq-question:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(53, 198, 212, 0.45);
  outline-offset: 3px;
}

.button-dark {
  background: var(--ink);
  box-shadow: none;
}

.button-dark:hover {
  background: #070b12;
  box-shadow: 0 12px 28px rgba(29, 35, 48, 0.22);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--coral-dark);
  font-weight: 800;
}

.text-link::after {
  content: "→";
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero {
  min-height: 650px;
  overflow: hidden;
  background: #fff;
}

.hero-grid {
  display: grid;
  min-height: 650px;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  align-items: center;
  gap: 64px;
  padding: 72px 0 58px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 620px;
  margin: 24px 0 28px;
  color: var(--muted);
  font-size: 19px;
}

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

.hero-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.hero-visual {
  position: relative;
  height: 520px;
}

.hero-visual::before {
  position: absolute;
  inset: 56px 0 32px 70px;
  content: "";
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--gold);
}

.phone-shot {
  position: absolute;
  width: min(46%, 230px);
  max-width: 400px;
  border: 7px solid var(--ink);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.phone-shot.primary {
  top: 4px;
  left: 34px;
  z-index: 2;
  transform: rotate(-4deg);
}

.phone-shot.secondary {
  right: 22px;
  bottom: 8px;
  z-index: 3;
  transform: rotate(5deg);
}

.mini-badge {
  position: absolute;
  right: 0;
  top: 62px;
  z-index: 4;
  width: 150px;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--aqua);
  color: #10272a;
  font-weight: 900;
  line-height: 1.35;
  box-shadow: 8px 8px 0 var(--ink);
}

.trust-strip {
  background: var(--ink);
  color: #fff;
}

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

.trust-item {
  min-height: 112px;
  padding: 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

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

.trust-item strong {
  display: block;
  color: var(--gold);
  font-size: 24px;
}

.trust-item span {
  color: #c8cdd5;
  font-size: 14px;
}

.section {
  padding: 88px 0;
}

.section-soft {
  background: var(--mist);
}

.section-aqua {
  background: #ddf7f8;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 42px;
}

.section-head h2,
.article-content h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-head .text-link {
  flex: 0 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-item {
  min-height: 270px;
  padding: 32px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.feature-number {
  display: block;
  margin-bottom: 42px;
  color: var(--coral-dark);
  font-weight: 900;
}

.feature-item h3,
.path-item h3,
.guide-step h2,
.topic-block h2 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: 0;
}

.feature-item p,
.path-item p,
.guide-step p,
.topic-block p {
  margin: 0;
  color: var(--muted);
}

.showcase-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.screen-figure {
  margin: 0;
}

.screen-figure img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 14px 34px rgba(29, 35, 48, 0.1);
}

.screen-figure figcaption {
  padding-top: 14px;
  color: var(--muted);
  font-size: 14px;
}

.screen-figure strong {
  display: block;
  color: var(--ink);
  font-size: 16px;
}

.content-paths {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}

.path-item {
  position: relative;
  min-height: 300px;
  padding: 38px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: #fff;
}

.path-item:first-child {
  background: var(--gold);
}

.path-item .path-index {
  display: block;
  margin-bottom: 76px;
  font-size: 14px;
  font-weight: 900;
}

.path-item .text-link {
  position: absolute;
  right: 38px;
  bottom: 34px;
}

.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.quote {
  margin: 0;
  padding: 30px;
  border-left: 4px solid var(--coral);
  background: #fff;
  box-shadow: 0 10px 30px rgba(29, 35, 48, 0.07);
}

.quote p {
  margin: 0 0 20px;
  font-size: 17px;
}

.quote cite {
  color: var(--muted);
  font-size: 14px;
  font-style: normal;
}

.download-band {
  padding: 64px 0;
  background: var(--coral);
  color: #fff;
}

.download-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.download-row h2 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
}

.download-row p {
  margin: 0;
  color: #ffe8ec;
}

.page-hero {
  padding: 86px 0 74px;
  border-bottom: 1px solid var(--line);
  background: var(--mist);
}

.page-hero p:last-child {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 70px;
  align-items: start;
}

.article-content {
  min-width: 0;
}

.article-content > p {
  color: #454e5b;
}

.article-content h2 {
  margin-top: 54px;
  font-size: 31px;
}

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

.article-content h3 {
  margin: 30px 0 8px;
  font-size: 21px;
}

.article-content ul,
.article-content ol {
  padding-left: 22px;
  color: #454e5b;
}

.article-aside {
  position: sticky;
  top: 98px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.article-aside strong {
  display: block;
  margin-bottom: 12px;
}

.article-aside a:not(.button) {
  display: block;
  padding: 9px 0;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.article-aside .button {
  width: 100%;
  margin-top: 20px;
}

.guide-step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  margin-top: 34px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.step-number {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-weight: 900;
}

.step-media {
  margin-top: 22px;
}

.step-media img {
  width: min(100%, 300px);
  max-width: 400px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.notice {
  margin: 32px 0;
  padding: 22px 24px;
  border-left: 5px solid var(--gold);
  background: #fff8df;
}

.notice strong {
  display: block;
  margin-bottom: 4px;
}

.topic-block {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.topic-block:first-child {
  padding-top: 0;
}

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

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

.faq-question {
  display: grid;
  width: 100%;
  grid-template-columns: 1fr 32px;
  align-items: center;
  gap: 18px;
  padding: 22px 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 17px;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  font-size: 25px;
  font-weight: 400;
  text-align: center;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  display: none;
  max-width: 760px;
  padding: 0 46px 24px 0;
  color: var(--muted);
}

.faq-answer.open {
  display: block;
}

.faq-answer p {
  margin: 0;
}

.site-footer {
  padding: 54px 0 26px;
  background: #11151d;
  color: #d7dbe2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 60px;
  padding-bottom: 34px;
}

.footer-grid .brand {
  color: #fff;
}

.footer-grid p {
  max-width: 480px;
  color: #9ca4b1;
  font-size: 14px;
}

.footer-links strong {
  display: block;
  margin-bottom: 10px;
  color: #fff;
}

.footer-links a {
  display: block;
  padding: 5px 0;
  color: #b9c0ca;
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #8f98a6;
  font-size: 13px;
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 920px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    padding: 20px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
  }

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

  .site-nav .button {
    width: 100%;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 56px;
  }

  .hero-visual {
    width: min(100%, 560px);
    margin: 0 auto;
  }

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

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

  .article-aside {
    position: static;
  }

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

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

  .hero-grid {
    padding: 44px 0 32px;
  }

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

  .hero-lead {
    font-size: 17px;
  }

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

  .hero-visual {
    height: 430px;
  }

  .hero-visual::before {
    inset: 55px 12px 24px 52px;
  }

  .phone-shot {
    width: 45%;
  }

  .phone-shot.primary {
    left: 20px;
  }

  .phone-shot.secondary {
    right: 14px;
  }

  .mini-badge {
    top: 36px;
    right: 6px;
    width: 124px;
    padding: 10px;
    font-size: 13px;
  }

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

  .trust-item:nth-child(2) {
    border-right: 0;
  }

  .trust-item:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .section {
    padding: 64px 0;
  }

  .section-head,
  .download-row,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-head {
    display: flex;
  }

  .feature-grid,
  .showcase-track,
  .content-paths,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-item {
    min-height: 220px;
  }

  .path-item {
    min-height: 280px;
    padding: 28px;
  }

  .path-item .text-link {
    right: 28px;
  }

  .download-row .button {
    width: 100%;
  }

  .page-hero {
    padding: 58px 0 50px;
  }

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

  .footer-brand {
    grid-column: auto;
  }
}

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

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