:root {
  --green: #12b886;
  --green-dark: #087f5b;
  --green-soft: #e9fbf4;
  --coral: #ff6b4a;
  --coral-soft: #fff0ec;
  --ink: #17211f;
  --muted: #5f6f6b;
  --line: #dce8e4;
  --paper: #ffffff;
  --wash: #f6faf8;
  --yellow: #ffd66b;
  --shadow: 0 18px 50px rgba(23, 33, 31, 0.1);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
}

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

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

button,
input,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: #ffffff;
  background: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(220, 232, 228, 0.9);
  background: rgba(255, 255, 255, 0.96);
}

.nav-shell {
  width: min(1180px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  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: 26px;
  margin-left: auto;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a {
  position: relative;
  padding: 23px 0 20px;
  color: #40504c;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 16px;
  left: 0;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

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

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  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: #ffffff;
  cursor: pointer;
}

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

.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  line-height: 1;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #ffffff;
  background: var(--coral);
  box-shadow: 0 10px 24px rgba(255, 107, 74, 0.24);
}

.btn-primary:hover {
  background: #ea5738;
}

.btn-secondary {
  border-color: var(--green);
  color: var(--green-dark);
  background: #ffffff;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 86px 0;
}

.section-muted {
  background: var(--wash);
}

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.22;
}

h1 {
  margin-bottom: 22px;
  font-size: 52px;
}

h2 {
  margin-bottom: 0;
  font-size: 34px;
}

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

p {
  margin: 0 0 18px;
}

.hero {
  min-height: 650px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(18, 184, 134, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(18, 184, 134, 0.08) 1px, transparent 1px),
    #f7fffb;
  background-size: 36px 36px;
}

.hero-grid {
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 64px;
  padding: 58px 0;
}

.hero-copy > p {
  max-width: 660px;
  margin-bottom: 28px;
  color: #41514d;
  font-size: 18px;
}

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

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 28px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.hero-meta li::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--green);
}

.hero-media {
  min-height: 520px;
  display: grid;
  place-items: center;
  align-self: stretch;
  position: relative;
}

.hero-media::before,
.hero-media::after {
  content: "";
  position: absolute;
  border: 2px solid var(--ink);
  background: var(--yellow);
}

.hero-media::before {
  width: 112px;
  height: 112px;
  top: 42px;
  right: 18px;
  transform: rotate(8deg);
}

.hero-media::after {
  width: 70px;
  height: 70px;
  bottom: 56px;
  left: 18px;
  border-radius: 50%;
  background: var(--coral-soft);
}

.phone-frame {
  z-index: 1;
  width: min(320px, 100%);
  padding: 10px;
  border: 3px solid var(--ink);
  border-radius: 34px;
  background: var(--ink);
  box-shadow: 20px 22px 0 var(--green);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 22px;
}

.signal-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.signal-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 24px 0;
  list-style: none;
}

.signal-list li {
  padding: 2px 20px;
  border-right: 1px solid var(--line);
  text-align: center;
}

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

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

.signal-list strong {
  font-size: 20px;
}

.signal-list span {
  color: var(--muted);
  font-size: 13px;
}

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

.feature-card {
  min-height: 210px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.feature-card:nth-child(2),
.feature-card:nth-child(5) {
  background: var(--green-soft);
}

.feature-card:nth-child(3),
.feature-card:nth-child(6) {
  background: var(--coral-soft);
}

.feature-number {
  display: inline-flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
  border-radius: 50%;
  color: #ffffff;
  background: var(--ink);
  font-weight: 800;
}

.feature-card p,
.step-copy p,
.setting-row p {
  margin-bottom: 0;
  color: var(--muted);
}

.preview-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: center;
  gap: 58px;
}

.preview-copy ul,
.check-list {
  margin: 24px 0 30px;
  padding: 0;
  list-style: none;
}

.preview-copy li,
.check-list li {
  position: relative;
  margin-bottom: 13px;
  padding-left: 26px;
  color: #40504c;
}

.preview-copy li::before,
.check-list li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 3px solid var(--green);
  border-radius: 50%;
}

.shot-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: center;
}

.shot-item {
  margin: 0;
  text-align: center;
}

.shot-item img,
.app-shot {
  width: min(100%, 320px);
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.shot-item:nth-child(2) {
  transform: translateY(28px);
}

.shot-item figcaption {
  margin-top: 13px;
  color: var(--muted);
  font-size: 13px;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.path-item {
  min-height: 250px;
  padding: 36px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

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

.path-item b {
  display: block;
  margin-bottom: 30px;
  color: var(--yellow);
  font-size: 14px;
}

.path-item p {
  color: #cbd7d4;
}

.path-item a {
  color: #8ff0d0;
  font-weight: 800;
}

.quote-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.quote-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.quote-card blockquote {
  margin: 0 0 22px;
  font-size: 19px;
  line-height: 1.7;
}

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

.rating-panel {
  display: grid;
  align-content: center;
  padding: 34px;
  border-radius: 8px;
  color: #ffffff;
  background: var(--green-dark);
}

.rating-number {
  margin: 0;
  font-size: 58px;
  font-weight: 900;
  line-height: 1;
}

.rating-panel small {
  margin-top: 14px;
  color: #c8f7e8;
}

.faq-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 44px;
}

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

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

.download-band {
  padding: 62px 0;
  background: var(--yellow);
}

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

.download-band h2 {
  max-width: 720px;
  font-size: 32px;
}

.site-footer {
  padding: 46px 0 28px;
  color: #d8e3e0;
  background: #101816;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr;
  gap: 44px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: #ffffff;
  font-size: 20px;
  font-weight: 800;
}

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.site-footer h3 {
  margin-bottom: 14px;
  color: #ffffff;
  font-size: 15px;
}

.site-footer p,
.site-footer a {
  color: #aabbb6;
  font-size: 14px;
}

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

.disclaimer {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #8fa39d;
  font-size: 13px;
}

.copyright {
  margin: 12px 0 0;
  color: #778c86;
  font-size: 13px;
}

.subhero {
  padding: 88px 0 68px;
  border-bottom: 1px solid var(--line);
  background: var(--green-soft);
}

.subhero-coral {
  background: var(--coral-soft);
}

.subhero-grid {
  display: grid;
  grid-template-columns: 1fr 0.75fr;
  align-items: center;
  gap: 64px;
}

.subhero h1 {
  max-width: 760px;
  font-size: 46px;
}

.subhero p {
  max-width: 720px;
  color: #40504c;
  font-size: 18px;
}

.subhero-visual {
  display: grid;
  place-items: center;
  min-height: 360px;
}

.subhero-visual .app-shot {
  width: 220px;
  box-shadow: 18px 18px 0 var(--green);
}

.topic-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.topic-index a {
  padding: 8px 13px;
  border: 1px solid rgba(8, 127, 91, 0.25);
  border-radius: 5px;
  color: var(--green-dark);
  background: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  font-weight: 700;
}

.steps {
  display: grid;
  gap: 0;
  counter-reset: guide-step;
}

.step {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) minmax(220px, 0.5fr);
  gap: 28px;
  align-items: start;
  padding: 38px 0;
  border-top: 1px solid var(--line);
  counter-increment: guide-step;
}

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

.step::before {
  content: "0" counter(guide-step);
  color: var(--green);
  font-size: 36px;
  font-weight: 900;
  line-height: 1;
}

.step-note {
  padding: 18px;
  border-left: 4px solid var(--coral);
  background: var(--coral-soft);
  color: #6d3d32;
  font-size: 14px;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
}

.content-block {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

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

.notice {
  padding: 22px;
  border: 1px solid #f0ce74;
  border-radius: 6px;
  background: #fff9e8;
}

.feature-detail {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 58px;
  align-items: center;
}

.feature-detail + .feature-detail {
  margin-top: 72px;
}

.feature-detail:nth-child(even) {
  grid-template-columns: 1.2fr 0.8fr;
}

.feature-detail:nth-child(even) .detail-media {
  order: 2;
}

.detail-copy p {
  color: #40504c;
}

.setting-table {
  width: 100%;
  border-collapse: collapse;
}

.setting-table th,
.setting-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.setting-table th {
  color: var(--green-dark);
  background: var(--green-soft);
}

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

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

.faq-list summary {
  position: relative;
  padding: 22px 46px 22px 0;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  top: 16px;
  right: 4px;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--green-dark);
  text-align: center;
  font-size: 22px;
  line-height: 31px;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-answer {
  max-width: 900px;
  padding: 0 48px 22px 0;
  color: #4b5d58;
}

.diagnostic-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.diagnostic-flow article {
  position: relative;
  min-height: 170px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.diagnostic-flow article:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -21px;
  z-index: 1;
  color: var(--coral);
  font-size: 24px;
}

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

.related-link {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

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

.related-link strong {
  margin-bottom: 7px;
}

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

@media (max-width: 920px) {
  h1 {
    font-size: 42px;
  }

  .hero-grid,
  .subhero-grid,
  .preview-layout,
  .feature-detail,
  .feature-detail:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding-top: 18px;
  }

  .hero-media {
    min-height: 490px;
  }

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

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

  .path-item:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
  }

  .subhero-visual {
    min-height: 300px;
  }

  .step {
    grid-template-columns: 70px 1fr;
  }

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

  .feature-detail:nth-child(even) .detail-media {
    order: 0;
  }

  .diagnostic-flow article:nth-child(2)::after {
    display: none;
  }
}

@media (max-width: 720px) {
  .nav-shell,
  .container {
    width: min(100% - 28px, 1120px);
  }

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

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    right: 14px;
    left: 14px;
    display: none;
    padding: 10px 18px 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
    gap: 0;
  }

  .site-nav a {
    padding: 13px 0;
    border-bottom: 1px solid var(--line);
  }

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

  .nav-download {
    display: none;
  }

  .section {
    padding: 64px 0;
  }

  h1,
  .subhero h1 {
    font-size: 36px;
  }

  h2,
  .download-band h2 {
    font-size: 28px;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 22px 0 24px;
  }

  .hero-copy > p,
  .subhero p {
    font-size: 16px;
  }

  .hero-media {
    min-height: 310px;
  }

  .phone-frame {
    width: min(170px, calc(100% - 34px));
    box-shadow: 12px 14px 0 var(--green);
  }

  .hero-copy > p {
    margin-bottom: 18px;
  }

  .hero-meta {
    gap: 10px;
    margin-top: 16px;
  }

  .signal-list,
  .feature-grid,
  .quote-grid,
  .faq-preview,
  .two-column,
  .related-links,
  .footer-grid,
  .diagnostic-flow {
    grid-template-columns: 1fr;
  }

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

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

  .signal-list li:nth-child(-n + 2) {
    margin-bottom: 18px;
  }

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

  .path-item,
  .path-item:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .path-item:last-child {
    grid-column: auto;
    border-top: 0;
    border-bottom: 0;
  }

  .shot-pair {
    gap: 12px;
  }

  .shot-item:nth-child(2) {
    transform: none;
  }

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

  .subhero {
    padding: 30px 0 20px;
  }

  .subhero-grid {
    gap: 18px;
  }

  .subhero-visual {
    min-height: 235px;
  }

  .subhero-visual .app-shot {
    width: 130px;
    box-shadow: 10px 10px 0 var(--green);
  }

  .subhero + .section {
    padding-top: 0;
  }

  .step {
    grid-template-columns: 54px 1fr;
    gap: 16px;
  }

  .step::before {
    font-size: 27px;
  }

  .step-note {
    grid-column: 1 / -1;
  }

  .setting-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .diagnostic-flow article:not(:last-child)::after {
    display: none;
  }
}

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

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