:root {
  --ink: #102b2a;
  --muted: #5f6f6d;
  --paper: #f7faf8;
  --white: #ffffff;
  --mint: #18b394;
  --mint-dark: #087b68;
  --sky: #2d8cff;
  --coral: #ff5c5c;
  --line: #dce8e4;
  --soft: #eaf7f3;
  --shadow: 0 18px 50px rgba(16, 43, 42, 0.12);
  --content: 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: absolute;
  top: -60px;
  left: 16px;
  z-index: 1000;
  padding: 10px 14px;
  color: var(--white);
  background: var(--ink);
}

.skip-link:focus {
  top: 16px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(220, 232, 228, 0.9);
  background: rgba(247, 250, 248, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
}

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

.site-nav a:not(.download-link) {
  position: relative;
  color: #344b49;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:not(.download-link)::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 2px;
  background: var(--mint);
  content: "";
  opacity: 0;
  transform: scaleX(0.5);
  transition: 180ms ease;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
  transition: 180ms ease;
}

.btn,
.download-link {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--mint-dark);
  border-radius: 6px;
  color: var(--white);
  background: var(--mint-dark);
  box-shadow: 0 8px 22px rgba(8, 123, 104, 0.2);
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn {
  min-width: 152px;
  padding: 12px 24px;
}

.download-link {
  min-width: 112px;
  padding: 9px 18px;
}

.btn:hover,
.download-link:hover {
  background: #076c5c;
  box-shadow: 0 12px 28px rgba(8, 123, 104, 0.26);
  transform: translateY(-2px);
}

.btn-secondary {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

.btn-secondary:hover {
  color: var(--white);
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 46px;
  background: linear-gradient(110deg, #f7faf8 0 57%, #dff6ef 57% 100%);
}

.hero::before {
  position: absolute;
  top: 38px;
  right: 0;
  width: 33%;
  height: 2px;
  background: var(--coral);
  content: "";
}

.hero-grid {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.82fr);
  gap: 56px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--mint-dark);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  width: 28px;
  height: 3px;
  background: var(--coral);
  content: "";
}

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

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

h1 {
  max-width: 700px;
  margin-bottom: 20px;
  font-size: clamp(42px, 6vw, 70px);
}

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

h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.hero-lead {
  max-width: 610px;
  margin-bottom: 26px;
  color: #3f5754;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.app-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.app-meta li::before {
  margin-right: 7px;
  color: var(--mint);
  content: "●";
  font-size: 10px;
}

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

.phone {
  position: absolute;
  width: min(52%, 246px);
  padding: 8px;
  border: 2px solid var(--ink);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  max-width: 358px;
  height: auto;
  border-radius: 20px;
}

.phone-main {
  top: 0;
  left: 9%;
  z-index: 2;
  transform: rotate(-3deg);
}

.phone-side {
  right: 3%;
  bottom: 0;
  transform: rotate(4deg);
}

.wind-mark {
  position: absolute;
  top: 48%;
  right: 0;
  left: 0;
  height: 44px;
  border-top: 5px solid var(--sky);
  border-bottom: 5px solid var(--coral);
  transform: rotate(-8deg);
}

.section {
  padding: 88px 0;
}

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

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

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

.section-head {
  display: flex;
  margin-bottom: 32px;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-head h2 {
  max-width: 690px;
  margin-bottom: 0;
}

.text-link {
  flex: 0 0 auto;
  color: var(--mint-dark);
  border-bottom: 2px solid var(--mint);
  font-weight: 800;
}

.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: 230px;
  padding: 30px 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.feature-no {
  display: block;
  margin-bottom: 28px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

.feature-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.route-list {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
}

.route-list li {
  position: relative;
  padding: 24px 30px 22px 0;
  border-top: 2px solid rgba(255, 255, 255, 0.24);
}

.route-list li:not(:last-child)::after {
  position: absolute;
  top: -9px;
  right: 22px;
  color: var(--coral);
  content: "→";
  font-size: 24px;
}

.route-list strong,
.route-list span {
  display: block;
}

.route-list strong {
  margin-bottom: 8px;
  font-size: 18px;
}

.route-list span {
  color: #b8cbc7;
  font-size: 14px;
}

.screens-grid {
  display: grid;
  align-items: start;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}

.screen-card {
  margin: 0;
}

.screen-card:nth-child(even) {
  margin-top: 40px;
}

.screen-shell {
  overflow: hidden;
  padding: 7px;
  border: 2px solid var(--ink);
  border-radius: 24px;
  background: var(--ink);
  box-shadow: 0 14px 34px rgba(16, 43, 42, 0.14);
}

.screen-shell img {
  width: 100%;
  max-width: 358px;
  height: auto;
  border-radius: 17px;
}

.screen-card figcaption {
  padding-top: 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 800;
}

.deep-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
}

.deep-panel {
  position: relative;
  min-height: 300px;
  padding: 38px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.deep-panel:first-child {
  color: var(--white);
  background: var(--sky);
  border-color: var(--sky);
}

.deep-panel h3 {
  max-width: 360px;
  font-size: 28px;
}

.deep-panel p {
  max-width: 500px;
  color: inherit;
}

.deep-panel ul {
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
}

.deep-panel li {
  margin: 8px 0;
}

.deep-panel li::before {
  margin-right: 8px;
  color: var(--coral);
  content: "◆";
  font-size: 10px;
}

.deep-panel:first-child .text-link {
  color: var(--white);
  border-color: var(--white);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.metric {
  padding: 34px;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.metric strong {
  display: block;
  margin-bottom: 5px;
  color: #7fe5d0;
  font-size: 36px;
}

.quote-grid {
  display: grid;
  margin-top: 28px;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.quote {
  margin: 0;
  padding: 26px;
  border-left: 3px solid var(--coral);
  background: rgba(255, 255, 255, 0.06);
}

.quote p {
  margin-bottom: 16px;
}

.quote cite {
  color: #a9c4bf;
  font-size: 14px;
  font-style: normal;
}

.mini-faq {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 48px;
}

.mini-faq article {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.mini-faq p {
  margin-bottom: 0;
  color: var(--muted);
}

.download-band {
  padding: 58px 0;
  color: var(--white);
  background: var(--mint-dark);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.download-band h2 {
  max-width: 720px;
  margin-bottom: 8px;
}

.download-band p {
  margin-bottom: 0;
  color: #caeee6;
}

.download-band .btn {
  color: var(--ink);
  background: var(--white);
  border-color: var(--white);
  box-shadow: none;
}

.page-hero {
  padding: 74px 0 54px;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.page-hero h1 {
  max-width: 850px;
  font-size: clamp(38px, 6vw, 62px);
}

.page-hero p {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--mint-dark);
  font-size: 14px;
  font-weight: 800;
}

.guide-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 64px;
}

.guide-aside {
  align-self: start;
  position: sticky;
  top: 100px;
}

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

.guide-aside a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.guide-aside a:hover {
  color: var(--mint-dark);
}

.step {
  display: grid;
  padding: 42px 0;
  border-top: 1px solid var(--line);
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 28px;
}

.step:first-child {
  padding-top: 0;
  border-top: 0;
}

.step-no {
  color: var(--sky);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
}

.step h2 {
  margin-bottom: 16px;
  font-size: 30px;
}

.step ul,
.check-list {
  padding-left: 20px;
}

.step-media {
  display: grid;
  margin-top: 24px;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  align-items: center;
  gap: 28px;
}

.step-media img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border: 8px solid var(--ink);
  border-radius: 22px;
}

.note {
  padding: 20px 22px;
  border-left: 4px solid var(--coral);
  background: #fff5f5;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--white);
  font-weight: 700;
}

.guide-related {
  padding: 30px;
}

.guide-related h2 {
  font-size: 28px;
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 56px;
}

.faq-group {
  margin-bottom: 54px;
}

.faq-group h2 {
  margin-bottom: 22px;
  font-size: 30px;
}

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

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

.faq-question {
  display: flex;
  width: 100%;
  padding: 20px 0;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-family: inherit;
  font-size: 18px;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  flex: 0 0 auto;
  color: var(--mint-dark);
  content: "+";
  font-size: 26px;
  font-weight: 400;
}

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

.faq-answer {
  padding: 0 38px 22px 0;
  color: var(--muted);
}

.faq-answer[hidden] {
  display: none;
}

.faq-aside {
  align-self: start;
  position: sticky;
  top: 100px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.faq-aside h2 {
  margin-bottom: 14px;
  font-size: 23px;
}

.faq-aside .btn {
  width: 100%;
  margin-top: 10px;
}

.site-footer {
  padding: 52px 0 26px;
  color: #c7d7d4;
  background: #0b201f;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 1.4fr;
  gap: 44px;
}

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

.footer-brand img {
  width: 44px;
  height: 44px;
}

.site-footer h2 {
  margin-bottom: 14px;
  color: var(--white);
  font-size: 18px;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer a:hover {
  color: #7fe5d0;
}

.disclaimer {
  font-size: 13px;
}

.copyright {
  margin: 34px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #8ba39f;
  font-size: 13px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (max-width: 980px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    padding: 20px;
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: 0 18px 30px rgba(16, 43, 42, 0.12);
  }

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

  .site-nav a:not(.download-link) {
    padding: 9px 4px;
  }

  .hero-grid {
    grid-template-columns: 1fr 420px;
    gap: 20px;
  }

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

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

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

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

  .guide-aside,
  .faq-aside {
    position: static;
  }

  .guide-aside {
    display: none;
  }
}

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

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

  .site-nav {
    top: 64px;
  }

  .brand {
    font-size: 18px;
  }

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

  .hero {
    padding: 50px 0 32px;
    background: linear-gradient(180deg, #f7faf8 0 58%, #dff6ef 58% 100%);
  }

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

  h1 {
    font-size: 43px;
  }

  h2 {
    font-size: 31px;
  }

  .hero-visual {
    min-height: 510px;
    margin-top: 22px;
  }

  .phone {
    width: 51%;
  }

  .section {
    padding: 64px 0;
  }

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

  .feature-grid,
  .deep-grid,
  .metrics,
  .quote-grid,
  .mini-faq,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .route-list {
    grid-template-columns: 1fr;
  }

  .route-list li:not(:last-child)::after {
    top: auto;
    right: 0;
    bottom: -10px;
    transform: rotate(90deg);
  }

  .screens-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .screen-card:nth-child(even) {
    margin-top: 28px;
  }

  .step {
    grid-template-columns: 1fr;
    gap: 14px;
  }

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

  .step-media img {
    max-width: 280px;
  }

  .page-hero {
    padding: 52px 0 38px;
  }

  .page-hero h1 {
    font-size: 40px;
  }
}

@media (max-width: 420px) {
  .hero-actions .btn {
    width: 100%;
  }

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

  .phone {
    width: 54%;
    padding: 5px;
    border-radius: 22px;
  }

  .phone img {
    border-radius: 16px;
  }

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

  .screen-card,
  .screen-card:nth-child(even) {
    width: min(100%, 300px);
    margin: 0 auto 24px;
  }

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

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

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