:root {
  --ink: #111827;
  --navy: #101829;
  --navy-soft: #1b263d;
  --paper: #f7f8fb;
  --white: #ffffff;
  --orange: #ff6b35;
  --orange-dark: #e84f19;
  --yellow: #ffc928;
  --mint: #36c6a5;
  --muted: #667085;
  --line: #e4e7ec;
  --shadow: 0 18px 50px rgba(16, 24, 41, 0.12);
}

* {
  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;
  line-height: 1.75;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(16, 24, 41, 0.96);
  color: var(--white);
  backdrop-filter: blur(16px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-size: 21px;
  font-weight: 800;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a:not(.button) {
  position: relative;
  color: #d8deea;
  font-size: 15px;
}

.site-nav a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 3px;
  background: var(--yellow);
  content: "";
  opacity: 0;
  transform: scaleX(0.4);
  transition: 0.2s ease;
}

.site-nav a[aria-current="page"]::after,
.site-nav a:not(.button):hover::after {
  opacity: 1;
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  color: var(--white);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 23px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  transition: 0.2s ease;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--orange);
  color: var(--white);
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 10px 25px rgba(255, 107, 53, 0.24);
  transition: transform 0.2s ease, background 0.2s ease;
}

.button:hover {
  background: var(--orange-dark);
  transform: translateY(-2px);
}

.button::after {
  content: "\2192";
  font-size: 19px;
}

.button-small {
  min-height: 40px;
  padding: 0 18px;
  font-size: 14px;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 670px;
  background: var(--navy);
  color: var(--white);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  content: "";
  mask-image: linear-gradient(to bottom, black, transparent 85%);
}

.hero-inner {
  position: relative;
  display: grid;
  min-height: 670px;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 70px;
  padding: 76px 0 96px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--yellow);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.eyebrow::before {
  width: 28px;
  height: 4px;
  background: var(--orange);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.28;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 620px;
  margin-bottom: 22px;
  font-size: clamp(40px, 6vw, 72px);
}

.hero-lead {
  max-width: 610px;
  margin: 0 0 30px;
  color: #c9d1df;
  font-size: 18px;
}

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

.hero-note {
  color: #9eabc0;
  font-size: 13px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.hero-badges li {
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  color: #d9dfeb;
  font-size: 13px;
}

.hero-stage {
  position: relative;
  min-height: 500px;
}

.phone {
  position: absolute;
  overflow: hidden;
  width: min(280px, 70vw);
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 34px;
  background: #070b13;
  box-shadow: 0 35px 80px rgba(0, 0, 0, 0.45);
}

.phone img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 26px;
}

.phone-main {
  z-index: 2;
  top: 0;
  right: 0;
  transform: rotate(2deg);
}

.phone-back {
  z-index: 1;
  top: 65px;
  right: 195px;
  width: 230px;
  opacity: 0.86;
  transform: rotate(-7deg);
}

.burst {
  position: absolute;
  z-index: 3;
  right: 245px;
  bottom: 25px;
  padding: 14px 18px;
  border: 4px solid var(--navy);
  background: var(--yellow);
  color: var(--navy);
  font-weight: 900;
  transform: rotate(-5deg);
  clip-path: polygon(8% 16%, 25% 20%, 34% 0, 48% 20%, 63% 6%, 70% 25%, 100% 24%, 82% 48%, 100% 66%, 72% 70%, 72% 100%, 50% 79%, 30% 96%, 28% 72%, 0 66%, 18% 48%);
}

.signal-strip {
  position: relative;
  z-index: 4;
  margin-top: -24px;
}

.signal-grid {
  display: grid;
  overflow: hidden;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}

.signal-item {
  min-height: 112px;
  padding: 23px 24px;
  border-right: 1px solid var(--line);
}

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

.signal-number {
  display: block;
  margin-bottom: 2px;
  color: var(--orange);
  font-size: 27px;
  font-weight: 900;
}

.signal-label {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 94px 0;
}

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

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 42px;
}

.section-head h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 46px);
}

.section-index {
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
}

.feature-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.feature-item {
  position: relative;
  padding: 34px 28px 8px 0;
}

.feature-item::before {
  position: absolute;
  top: -3px;
  left: 0;
  width: 58px;
  height: 5px;
  background: var(--orange);
  content: "";
}

.feature-item h3 {
  margin-bottom: 13px;
  font-size: 20px;
}

.feature-item p {
  margin: 0;
  color: #adb8c9;
  font-size: 15px;
}

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

.screen-shot {
  margin: 0;
}

.screen-shot:nth-child(even) {
  margin-top: 46px;
}

.screen-shot img {
  width: 100%;
  max-width: 390px;
  height: auto;
  border: 8px solid var(--navy);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.screen-shot figcaption {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 11px;
  padding: 17px 4px 0;
  color: var(--muted);
  font-size: 14px;
}

.caption-no {
  color: var(--orange);
  font-weight: 900;
}

.route-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 70px;
  align-items: start;
}

.route-copy h2 {
  margin-bottom: 23px;
  font-size: clamp(32px, 4vw, 48px);
}

.route-copy p {
  color: var(--muted);
}

.route-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.route-list li {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.route-list li:first-child {
  border-top: 1px solid var(--line);
}

.route-list strong {
  color: var(--orange);
  font-size: 25px;
}

.route-list h3 {
  margin-bottom: 7px;
  font-size: 19px;
}

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

.deep-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.deep-link {
  position: relative;
  min-height: 280px;
  padding: 38px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: var(--navy-soft);
}

.deep-link:first-child {
  border-top: 5px solid var(--yellow);
}

.deep-link:last-child {
  border-top: 5px solid var(--mint);
}

.deep-link h3 {
  margin: 22px 0 14px;
  font-size: 28px;
}

.deep-link p {
  color: #adb8c9;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--yellow);
  font-weight: 800;
}

.text-link::after {
  content: "\2192";
}

.download-band {
  background: var(--yellow);
}

.download-band .container {
  display: flex;
  min-height: 190px;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.download-band h2 {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 42px);
}

.download-band p {
  margin: 0;
  color: #4a3b00;
}

.page-hero {
  overflow: hidden;
  padding: 82px 0 78px;
  background: var(--navy);
  color: var(--white);
}

.page-hero .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: end;
}

.page-hero h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: clamp(38px, 5vw, 62px);
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: #b8c2d1;
  font-size: 17px;
}

.page-mark {
  color: var(--yellow);
  font-size: 96px;
  font-weight: 900;
  line-height: 0.8;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 60px;
  align-items: start;
}

.article-section {
  padding: 0 0 64px;
}

.article-section + .article-section {
  padding-top: 64px;
  border-top: 1px solid var(--line);
}

.article-section h2 {
  margin-bottom: 28px;
  font-size: 32px;
}

.article-section h3 {
  margin: 28px 0 10px;
  font-size: 21px;
}

.article-section p {
  margin: 0 0 18px;
  color: #475467;
}

.step-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-card {
  display: grid;
  grid-template-columns: 66px 1fr;
  gap: 22px;
  padding: 26px;
  border-left: 4px solid var(--orange);
  background: var(--white);
  box-shadow: 0 10px 30px rgba(16, 24, 41, 0.06);
}

.step-num {
  color: var(--orange);
  font-size: 30px;
  font-weight: 900;
}

.step-card h3 {
  margin: 0 0 8px;
}

.step-card p {
  margin: 0;
}

.notice {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 5px solid var(--yellow);
  background: #fff7d6;
  color: #5c4b00;
}

.side-nav {
  position: sticky;
  top: 100px;
  padding: 24px;
  border-top: 5px solid var(--orange);
  background: var(--white);
  box-shadow: 0 10px 30px rgba(16, 24, 41, 0.06);
}

.side-nav strong {
  display: block;
  margin-bottom: 14px;
}

.side-nav a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.side-nav a:hover {
  color: var(--orange);
}

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

.feature-detail {
  padding: 26px;
  border-top: 4px solid var(--orange);
  background: var(--white);
}

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

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

.faq-question span:last-child {
  color: var(--orange);
  font-size: 24px;
  text-align: center;
  transition: transform 0.2s ease;
}

.faq-item.open .faq-question span:last-child {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.faq-answer p {
  margin: 0;
  padding: 0 50px 22px 0;
  color: var(--muted);
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 0;
  list-style: none;
}

.related-links a {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--orange-dark);
  font-weight: 700;
}

.site-footer {
  padding: 55px 0 26px;
  background: #090e19;
  color: #aeb8c8;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 55px;
  padding-bottom: 38px;
}

.footer-grid h3 {
  margin-bottom: 15px;
  color: var(--white);
  font-size: 16px;
}

.footer-brand {
  margin-bottom: 16px;
}

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

.footer-grid p,
.footer-grid a {
  font-size: 13px;
}

.footer-links {
  display: grid;
  gap: 8px;
}

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

.disclaimer {
  margin: 0;
  color: #7e899b;
}

.copyright {
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #697386;
  font-size: 12px;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

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

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

@media (max-width: 960px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    height: calc(100vh - 72px);
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 26px 20px;
    background: var(--navy);
  }

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

  .site-nav a:not(.button) {
    padding: 16px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 17px;
  }

  .site-nav a::after {
    display: none;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    min-height: 520px;
  }

  .phone-main {
    right: 12%;
  }

  .phone-back {
    right: 48%;
  }

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

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

  .signal-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .screenshot-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .side-nav {
    position: static;
    order: -1;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, 1180px);
  }

  .brand {
    font-size: 18px;
  }

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

  .hero-inner {
    gap: 40px;
    padding: 58px 0 74px;
  }

  .hero h1 {
    font-size: 43px;
  }

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

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-note {
    text-align: center;
  }

  .hero-stage {
    min-height: 430px;
  }

  .phone-main {
    right: 0;
    width: 220px;
  }

  .phone-back {
    top: 55px;
    right: auto;
    left: 0;
    width: 180px;
  }

  .burst {
    right: auto;
    bottom: 8px;
    left: 4px;
    font-size: 13px;
  }

  .signal-grid,
  .feature-track,
  .screenshot-rail,
  .deep-links,
  .feature-detail-grid {
    grid-template-columns: 1fr;
  }

  .signal-item,
  .signal-item:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .section {
    padding: 70px 0;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
    gap: 10px;
  }

  .screen-shot,
  .screen-shot:nth-child(even) {
    margin: 0;
  }

  .screen-shot img {
    width: min(100%, 340px);
    margin: 0 auto;
  }

  .download-band .container {
    min-height: 240px;
    align-items: stretch;
    flex-direction: column;
    justify-content: center;
  }

  .page-hero .container {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .page-mark {
    font-size: 68px;
  }

  .step-card {
    grid-template-columns: 42px 1fr;
    padding: 22px 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}