:root {
  --ink: #171a1c;
  --muted: #5e666c;
  --line: #d9dfe2;
  --paper: #ffffff;
  --soft: #f3f6f5;
  --soft-blue: #edf4ff;
  --soft-green: #eaf7f0;
  --soft-orange: #fff1e6;
  --blue: #1d5fd1;
  --blue-dark: #15499f;
  --green: #087a55;
  --green-dark: #065b40;
  --orange: #c85312;
  --danger: #b3261e;
  --shadow: 0 18px 44px rgba(23, 26, 28, 0.11);
  --font: Geist, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color-scheme: light;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

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

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

svg {
  width: 1em;
  height: 1em;
  stroke-width: 1.8;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  transform: translateY(-150%);
  padding: 10px 14px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--paper);
  color: var(--ink);
}

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

.copy-status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.shell {
  width: min(1240px, calc(100% - 40px));
  margin: 0 auto;
}

.narrow {
  width: min(860px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(23, 26, 28, 0.12);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 76px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 158px;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
  line-height: 1;
}

.brand-logo {
  display: block;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border: 1px solid #d9e4ef;
  border-radius: 50%;
  background: #fff;
  object-fit: cover;
  box-shadow: 0 6px 16px rgba(36, 86, 158, 0.14);
}

.brand-copy {
  display: grid;
  line-height: 1.2;
}

.brand-copy strong {
  font-size: 15px;
}

.brand-copy small {
  color: var(--muted);
  font-size: 11px;
}

.desktop-nav {
  display: flex;
  justify-content: center;
  gap: 28px;
}

.desktop-nav a {
  position: relative;
  padding: 25px 0 22px;
  color: #3b4247;
  font-size: 14px;
  font-weight: 650;
}

.desktop-nav a::after {
  position: absolute;
  right: 0;
  bottom: 17px;
  left: 0;
  height: 2px;
  transform: scaleX(0);
  background: var(--ink);
  content: "";
  transition: transform 180ms ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 17px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  font-weight: 760;
  line-height: 1.2;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
  background: #2b3033;
}

.btn.secondary {
  background: #fff;
  color: var(--ink);
}

.btn.secondary:hover {
  background: var(--soft);
}

.btn.ai {
  border-color: var(--green);
  background: var(--green);
}

.btn.ai:hover {
  background: var(--green-dark);
}

.btn.api {
  border-color: var(--blue);
  background: var(--blue);
}

.btn.api:hover {
  background: var(--blue-dark);
}

.btn.small {
  min-height: 40px;
  padding: 9px 13px;
  font-size: 13px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: #fff;
}

.mobile-nav-inner {
  display: grid;
  gap: 2px;
  padding: 12px 0 20px;
}

.mobile-nav a {
  padding: 12px 4px;
  border-bottom: 1px solid #edf0f1;
  font-weight: 650;
}

.mobile-nav .mobile-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 12px;
}

.mobile-nav .mobile-actions .btn {
  border-bottom: 1px solid currentColor;
  padding: 11px 10px;
}

.hero {
  position: relative;
  display: grid;
  min-height: clamp(630px, calc(100svh - 132px), 780px);
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #f7f9f8;
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-media img {
  position: absolute;
  width: min(52vw, 720px);
  height: min(68vh, 650px);
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.82) contrast(1.06);
}

.hero-media .media-left {
  top: 50%;
  left: -5vw;
  transform: translateY(-50%);
  object-position: center;
}

.hero-media .media-right {
  top: 50%;
  right: -5vw;
  transform: translateY(-50%);
  object-position: left center;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  background: rgba(247, 249, 248, 0.83);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 70px 0;
  text-align: center;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
}

.hero h1,
.product-hero h1 {
  width: min(1120px, 100%);
  margin: 0 auto;
  font-size: clamp(2.5rem, 5vw, 5.25rem);
  font-weight: 860;
  line-height: 1.03;
  text-wrap: balance;
}

.hero-lead,
.product-lead {
  width: min(820px, 100%);
  margin: 24px auto 0;
  color: #41494e;
  font-size: clamp(1rem, 1.4vw, 1.22rem);
  line-height: 1.8;
}

.hero-actions,
.product-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 30px;
}

.hero-note {
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 112px 0;
}

.section.compact {
  padding: 80px 0;
}

.section.soft {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

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

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  align-items: end;
  gap: 48px;
  margin-bottom: 42px;
}

.section-head h2,
.pin-title h2,
.article-content h2 {
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3.7rem);
  line-height: 1.08;
  text-wrap: balance;
}

.section-head p,
.pin-title p {
  margin: 0;
  color: var(--muted);
}

.section-head.spaced {
  margin-top: 72px;
}

.section.dark .section-head p,
.section.dark .pin-title p {
  color: #b8c0c5;
}

.path-grid,
.guide-grid,
.feature-grid,
.faq-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-flow: dense;
  gap: 16px;
}

.path-card {
  grid-column: span 6;
  min-height: 360px;
  padding: 34px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: transform 260ms ease, box-shadow 260ms ease;
}

.path-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.path-card.ai-path {
  border-top: 5px solid var(--green);
}

.path-card.api-path {
  border-top: 5px solid var(--blue);
}

.path-icon,
.feature-icon {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 6px;
  background: var(--soft);
  color: var(--ink);
  font-size: 22px;
}

.path-card.ai-path .path-icon {
  background: var(--soft-green);
  color: var(--green);
}

.path-card.api-path .path-icon {
  background: var(--soft-blue);
  color: var(--blue);
}

.path-card h3 {
  margin: 58px 0 12px;
  font-size: clamp(1.65rem, 2.4vw, 2.55rem);
  line-height: 1.12;
}

.path-card p {
  max-width: 540px;
  margin: 0;
  color: var(--muted);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 24px;
  border-bottom: 1px solid currentColor;
  color: var(--ink);
  font-weight: 760;
}

.text-link.ai-link {
  color: var(--green);
}

.text-link.api-link {
  color: var(--blue);
}

.task-marquee {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.task-track {
  display: flex;
  width: max-content;
  animation: task-marquee 34s linear infinite;
}

.task-track span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  border-right: 1px solid var(--line);
  color: #343a3e;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.task-track span::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  content: "";
}

@keyframes task-marquee {
  to {
    transform: translateX(-50%);
  }
}

.pin-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 72px;
  align-items: start;
}

.pin-title {
  padding-top: 10px;
}

.pin-title p {
  margin-top: 18px;
}

.story-stack {
  display: grid;
  gap: 70px;
}

.story-item {
  display: grid;
  gap: 18px;
}

.story-item img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.story-item h3 {
  margin: 0;
  font-size: clamp(1.45rem, 2.2vw, 2.2rem);
  line-height: 1.2;
}

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

.inline-image {
  display: inline-block;
  width: 96px;
  height: 42px;
  margin: 0 7px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  vertical-align: middle;
}

.inline-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.guide-card {
  grid-column: span 4;
  display: flex;
  min-height: 250px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: transform 220ms ease, border-color 220ms ease;
}

.guide-card:hover {
  transform: translateY(-4px);
  border-color: #98a3aa;
}

.guide-card .guide-type {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.guide-card h3 {
  margin: 30px 0 10px;
  font-size: 1.42rem;
  line-height: 1.28;
}

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

.guide-card .text-link {
  margin-top: auto;
  padding-top: 20px;
  align-self: flex-start;
}

.horizontal-accordion {
  display: flex;
  min-height: 470px;
  gap: 10px;
}

.accordion-panel {
  position: relative;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #22282b;
  color: #fff;
  transition: flex 500ms ease;
}

.accordion-panel:hover,
.accordion-panel:focus-within {
  flex: 1.75;
}

.accordion-panel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.58;
  transition: transform 700ms ease, opacity 500ms ease;
}

.accordion-panel:hover img,
.accordion-panel:focus-within img {
  transform: scale(1.05);
  opacity: 0.42;
}

.accordion-panel::after {
  position: absolute;
  inset: 0;
  background: rgba(13, 17, 19, 0.42);
  content: "";
}

.accordion-content {
  position: absolute;
  z-index: 2;
  right: 24px;
  bottom: 24px;
  left: 24px;
}

.accordion-content h3 {
  margin: 0 0 8px;
  font-size: clamp(1.35rem, 2vw, 2rem);
}

.accordion-content p {
  max-width: 520px;
  margin: 0;
  color: #e3e8ea;
  font-size: 14px;
}

.accordion-content a {
  display: inline-flex;
  margin-top: 16px;
  border-bottom: 1px solid #fff;
  font-weight: 760;
}

.cta-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid #3e4549;
  border-radius: 8px;
  background: #3e4549;
}

.cta-pane {
  display: flex;
  min-height: 320px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 42px;
  background: var(--ink);
}

.cta-pane h2 {
  margin: 0;
  font-size: clamp(2rem, 3.3vw, 3.45rem);
  line-height: 1.08;
}

.cta-pane p {
  margin: 16px 0 26px;
  color: #bbc3c7;
}

.product-hero {
  position: relative;
  display: grid;
  min-height: clamp(620px, calc(100svh - 126px), 760px);
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #f7f9f8;
}

.product-hero-media {
  position: absolute;
  inset: 0;
}

.product-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
}

.product-hero-media::after {
  position: absolute;
  inset: 0;
  background: rgba(247, 249, 248, 0.83);
  content: "";
}

.product-hero-content {
  position: relative;
  z-index: 2;
  padding: 70px 0;
  text-align: center;
}

.product-trust {
  width: min(880px, 100%);
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 13px;
}

.feature-card {
  grid-column: span 4;
  padding: 26px;
  border-top: 3px solid var(--ink);
  background: #fff;
}

.feature-card.blue-top {
  border-top-color: var(--blue);
}

.feature-card.orange-top {
  border-top-color: var(--orange);
}

.feature-card.green-top {
  border-top-color: var(--green);
}

.feature-icon.blue-icon {
  background: var(--soft-blue);
  color: var(--blue);
}

.feature-icon.orange-icon,
.path-icon.orange-icon {
  background: var(--soft-orange);
  color: var(--orange);
}

.feature-icon.green-icon {
  background: var(--soft-green);
  color: var(--green);
}

.feature-card h3 {
  margin: 20px 0 8px;
  font-size: 1.35rem;
}

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

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

.process-step {
  display: grid;
  grid-template-columns: 82px minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: 28px;
  align-items: start;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.process-step .number {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.process-step h3 {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1.25;
}

.process-step p {
  margin: 0;
  color: var(--muted);
}

.media-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.media-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 700ms ease;
}

.media-frame:hover img {
  transform: scale(1.04);
}

.media-caption {
  padding: 16px 18px 18px;
}

.media-caption strong {
  display: block;
}

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

.notice {
  padding: 22px 24px;
  border-left: 4px solid var(--orange);
  background: var(--soft-orange);
  color: #5d2b0c;
}

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

.path-card.orange-path {
  border-top: 5px solid var(--orange);
}

.text-link.orange-link {
  color: var(--orange);
}

.center-cta {
  text-align: center;
}

.center-cta h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4.1rem);
  line-height: 1.08;
}

.center-cta p {
  max-width: 720px;
  margin: 18px auto 28px;
  color: #bbc3c7;
}

.faq-grid details {
  grid-column: span 6;
  border-bottom: 1px solid var(--line);
}

.faq-grid summary {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  cursor: pointer;
  font-weight: 760;
  list-style: none;
}

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

.faq-grid summary::after {
  color: var(--muted);
  content: "+";
  font-size: 24px;
}

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

.faq-grid details p {
  margin: -4px 0 22px;
  color: var(--muted);
}

.article-hero {
  padding: 78px 0 62px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a:hover {
  color: var(--ink);
}

.article-hero h1 {
  max-width: 1060px;
  margin: 0;
  font-size: clamp(2.35rem, 4.7vw, 4.7rem);
  line-height: 1.06;
  text-wrap: balance;
}

.article-deck {
  max-width: 860px;
  margin: 22px 0 0;
  color: #444c51;
  font-size: clamp(1rem, 1.35vw, 1.18rem);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 13px;
}

.direct-answer {
  max-width: 980px;
  margin-top: 30px;
  padding: 24px 26px;
  border-left: 4px solid var(--green);
  background: #fff;
  box-shadow: 0 8px 24px rgba(23, 26, 28, 0.05);
}

.direct-answer.api-answer {
  border-left-color: var(--blue);
}

.direct-answer strong {
  display: block;
  margin-bottom: 7px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 820px) 240px;
  gap: 70px;
  align-items: start;
  justify-content: center;
  padding: 72px 0 110px;
}

.article-sidebar {
  position: sticky;
  top: 92px;
  display: grid;
  align-content: start;
  gap: 8px;
}

.article-sidebar > section {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

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

.article-toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
}

.article-toc nav {
  display: grid;
  border-top: 1px solid var(--line);
}

.article-toc a {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.article-toc a:hover {
  color: var(--ink);
}

.article-wechat-card {
  display: grid;
  justify-items: center;
  text-align: center;
}

.article-wechat-card h2 {
  width: 100%;
  margin: 0 0 4px;
  font-size: 17px;
}

.article-wechat-card p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.article-wechat-qr {
  display: block;
  width: 136px;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background: #fff;
}

.article-wechat-card small {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

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

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

.article-content h2 {
  margin: 78px 0 22px;
  font-size: clamp(1.9rem, 3.1vw, 3rem);
  scroll-margin-top: 110px;
}

.article-content h3 {
  margin: 38px 0 12px;
  font-size: 1.42rem;
  line-height: 1.3;
}

.article-content p,
.article-content li {
  color: #353c40;
}

.article-content ul,
.article-content ol {
  padding-left: 1.35em;
}

.article-content li + li {
  margin-top: 8px;
}

.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.audience-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

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

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

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

.article-step {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 22px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.article-step .step-number {
  color: var(--blue);
  font-size: 14px;
  font-weight: 850;
}

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

.article-step p {
  margin: 0;
}

.code-block {
  position: relative;
  margin: 22px 0;
  overflow: hidden;
  border: 1px solid #32383c;
  border-radius: 8px;
  background: #15191b;
}

.code-head {
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 12px 0 18px;
  border-bottom: 1px solid #32383c;
  color: #c6cdd1;
  font-size: 12px;
}

.copy-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  border: 1px solid #4a5358;
  border-radius: 5px;
  background: #22282b;
  color: #fff;
  cursor: pointer;
}

.copy-button:hover {
  background: #30373b;
}

pre {
  margin: 0;
  overflow-x: auto;
  padding: 22px;
  color: #e9eef0;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px;
  line-height: 1.75;
  tab-size: 2;
  white-space: pre;
}

code {
  font-family: "Cascadia Code", Consolas, monospace;
}

:not(pre) > code {
  padding: 2px 5px;
  border: 1px solid #d8dde0;
  border-radius: 4px;
  background: #f4f6f7;
  font-size: 0.9em;
}

.example-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.example-compare > div {
  padding: 22px;
  background: #fff;
}

.example-compare strong {
  display: block;
  margin-bottom: 10px;
}

.example-compare p {
  margin: 0;
}

.checklist {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  margin: 0;
  padding: 13px 14px 13px 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.checklist li::before {
  position: absolute;
  top: 14px;
  left: 15px;
  color: var(--green);
  content: "✓";
  font-weight: 900;
}

.article-cta {
  margin-top: 70px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.article-cta h2 {
  margin: 0;
  font-size: clamp(1.65rem, 2.5vw, 2.4rem);
}

.article-cta p {
  margin: 12px 0 22px;
}

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

.article-faq summary {
  padding: 18px 0;
  cursor: pointer;
  font-weight: 760;
}

.article-faq p {
  margin: -5px 0 18px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.related-links a {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
}

.related-links a:hover {
  border-color: #8e999f;
}

.site-footer {
  padding: 64px 0 28px;
  border-top: 1px solid #353b3f;
  background: #171a1c;
  color: #fff;
}

.site-footer .brand-logo {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.1fr) repeat(3, minmax(120px, 0.72fr)) minmax(88px, 0.52fr);
  gap: 32px;
}

.footer-intro p {
  max-width: 460px;
  margin: 18px 0 0;
  color: #adb6ba;
}

.footer-contacts {
  max-width: 250px;
  margin-top: 18px;
}

.footer-contact-copy {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.footer-contact-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  color: #c8d0d4;
  font-size: 12px;
  line-height: 1.45;
}

.footer-contact-item b {
  color: #86949b;
  font-size: 11px;
  font-weight: 600;
}

.footer-contact-item strong {
  min-width: 0;
  color: #fff;
  font-weight: 600;
  overflow-wrap: anywhere;
}

a.footer-contact-item:hover strong {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-official-account {
  justify-items: start;
  gap: 8px;
}

.footer-official-account > strong {
  margin-bottom: 0;
}

.footer-official-account img {
  display: block;
  width: 78px;
  height: 78px;
  padding: 3px;
  border-radius: 4px;
  background: #fff;
}

.footer-official-account small {
  width: 78px;
  color: #adb6ba;
  font-size: 10px;
  line-height: 1.35;
  text-align: center;
}

.footer-col {
  display: grid;
  align-content: start;
  gap: 8px;
}

.footer-col strong {
  margin-bottom: 8px;
  font-size: 13px;
}

.footer-col a {
  color: #bfc7ca;
  font-size: 13px;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  margin-top: 52px;
  padding-top: 22px;
  border-top: 1px solid #353b3f;
  color: #939da2;
  font-size: 12px;
}

.footer-bottom > span:first-child {
  flex: 0 0 auto;
  white-space: nowrap;
}

.footer-bottom > span:last-child {
  max-width: 980px;
  line-height: 1.7;
}

.mobile-only {
  display: none;
}

@media (max-width: 1040px) {
  .desktop-nav {
    gap: 17px;
  }

  .nav-actions .btn.secondary {
    display: none;
  }

  .pin-layout {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .pin-title {
    max-width: 760px;
  }

  .story-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .story-item img {
    aspect-ratio: 4 / 3;
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 46px;
  }
}

@media (max-width: 1200px) {
  .nav-row {
    grid-template-columns: 1fr auto;
  }

  .desktop-nav,
  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .mobile-nav.is-open {
    display: block;
  }
}

@media (max-width: 840px) {

  .hero-media img {
    width: 78vw;
    opacity: 0.18;
  }

  .hero-media .media-left {
    left: -33vw;
  }

  .hero-media .media-right {
    right: -33vw;
  }

  .section,
  .section.compact {
    padding: 78px 0;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .path-card,
  .guide-card,
  .feature-card,
  .faq-grid details {
    grid-column: span 12;
  }

  .path-card {
    min-height: 310px;
  }

  .story-stack {
    grid-template-columns: 1fr;
    gap: 54px;
  }

  .horizontal-accordion {
    min-height: auto;
    flex-direction: column;
  }

  .accordion-panel,
  .accordion-panel:hover,
  .accordion-panel:focus-within {
    min-height: 330px;
    flex: none;
  }

  .cta-split,
  .media-pair {
    grid-template-columns: 1fr;
  }

  .process-step {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .process-step p {
    grid-column: 2;
  }

  .article-layout {
    grid-template-columns: 1fr;
    padding-top: 42px;
  }

  .article-sidebar {
    position: static;
    justify-self: center;
    width: min(100%, 360px);
  }

  .article-toc {
    display: none;
  }

  .article-wechat-qr {
    width: 190px;
  }

  .related-links {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 560px) {
  .shell,
  .narrow {
    width: min(100% - 28px, 1240px);
  }

  .nav-row {
    min-height: 66px;
  }

  .brand-copy small {
    display: none;
  }

  .brand {
    min-width: 0;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-logo {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
  }

  .hero,
  .product-hero {
    min-height: calc(100svh - 94px);
  }

  .hero-content,
  .product-hero-content {
    padding: 54px 0;
  }

  .hero h1,
  .product-hero h1 {
    font-size: clamp(1.95rem, 9vw, 3.1rem);
    line-height: 1.08;
  }

  .hero-lead,
  .product-lead {
    line-height: 1.65;
  }

  .hero-actions,
  .product-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-actions .btn,
  .product-actions .btn {
    width: 100%;
  }

  .section,
  .section.compact {
    padding: 64px 0;
  }

  .section-head h2,
  .pin-title h2 {
    font-size: 2.15rem;
  }

  .path-card {
    min-height: 0;
    padding: 25px;
  }

  .path-card h3 {
    margin-top: 38px;
  }

  .guide-card {
    min-height: 220px;
  }

  .inline-image {
    width: 72px;
    height: 34px;
  }

  .cta-pane {
    min-height: 280px;
    padding: 28px;
  }

  .process-step {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .process-step p {
    grid-column: auto;
  }

  .article-hero {
    padding: 48px 0 42px;
  }

  .article-hero h1 {
    font-size: clamp(1.9rem, 8.7vw, 3rem);
    line-height: 1.08;
  }

  .article-layout {
    gap: 30px;
    padding-bottom: 72px;
  }

  .article-toc nav {
    grid-template-columns: 1fr;
  }

  .article-content h2 {
    margin-top: 60px;
    font-size: 2rem;
  }

  .audience-grid,
  .example-compare {
    grid-template-columns: 1fr;
  }

  .article-step {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
  }

  pre {
    padding: 18px;
    font-size: 12px;
  }

  .article-cta {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.hub-hero {
  padding: 88px 0 76px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.hub-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  align-items: center;
  gap: 64px;
}

.hub-hero h1 {
  max-width: 880px;
  margin: 12px 0 20px;
  font-size: clamp(2.65rem, 5.4vw, 5.8rem);
  line-height: 1.02;
  text-wrap: balance;
}

.hub-hero .hero-lead {
  max-width: 760px;
}

.hub-visual {
  display: grid;
  gap: 12px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.hub-visual-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.hub-visual-row:last-child {
  border-bottom: 0;
}

.hub-visual-row span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 6px;
  background: var(--soft-blue);
  color: var(--blue);
  font-size: 12px;
  font-weight: 850;
}

.hub-visual-row strong {
  display: block;
  margin-bottom: 3px;
}

.hub-visual-row p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.hub-showcase {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.hub-showcase figure {
  position: relative;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.hub-showcase-main {
  grid-row: 1 / 3;
}

.hub-showcase img {
  width: 100%;
  height: 100%;
  min-height: 168px;
  object-fit: cover;
}

.hub-showcase-main img {
  min-height: 346px;
}

.hub-showcase figcaption {
  position: absolute;
  right: 8px;
  bottom: 8px;
  left: 8px;
  padding: 8px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  font-size: 12px;
  font-weight: 760;
}

.hub-route-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.hub-route {
  display: grid;
  min-width: 0;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.hub-route:hover .hub-route-action {
  color: var(--ink);
}

.hub-route-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 6px;
  background: var(--soft-blue);
  color: var(--blue);
}

.hub-route-icon.ai {
  background: var(--soft-green);
  color: var(--green);
}

.hub-route-icon svg {
  width: 20px;
  height: 20px;
}

.hub-route strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1.08rem;
}

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

.hub-route-action {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
  white-space: nowrap;
}

.hub-route-action svg {
  width: 16px;
  height: 16px;
}

.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.filter-panel {
  margin-bottom: 38px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
}

.filter-input-wrap {
  position: relative;
}

.filter-input-wrap svg {
  position: absolute;
  top: 50%;
  left: 16px;
  transform: translateY(-50%);
  color: var(--muted);
}

.filter-input {
  width: 100%;
  min-height: 52px;
  padding: 12px 16px 12px 48px;
  border: 1px solid #aeb8bd;
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
}

.filter-input:focus {
  border-color: var(--blue);
  outline: 3px solid rgba(29, 95, 209, 0.13);
}

.filter-count {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.filter-empty {
  margin-top: 24px;
  padding: 24px;
  border: 1px dashed #9da7ac;
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

.prompt-category + .prompt-category {
  margin-top: 58px;
}

.prompt-category-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.prompt-category-head h2 {
  margin: 0;
  font-size: clamp(1.55rem, 2.4vw, 2.35rem);
}

.prompt-category-head span {
  color: var(--muted);
  font-size: 13px;
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.prompt-card {
  display: grid;
  min-height: 116px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  transition: transform 180ms ease, border-color 180ms ease;
}

.prompt-card:hover {
  transform: translateY(-3px);
  border-color: #8d989e;
}

.prompt-card strong {
  align-self: start;
  line-height: 1.35;
}

.prompt-card svg {
  color: var(--muted);
}

.source-list {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.source-list li {
  margin: 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.source-list a {
  color: var(--blue);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.article-table-wrap {
  margin: 22px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.article-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.article-table th,
.article-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-table th {
  background: var(--soft);
  font-size: 13px;
}

.article-table tr:last-child td {
  border-bottom: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1040px) {
  .hub-hero-grid {
    grid-template-columns: 1fr 0.8fr;
    gap: 38px;
  }

  .prompt-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 840px) {
  .hub-hero-grid {
    grid-template-columns: 1fr;
  }

  .hub-visual,
  .hub-showcase {
    max-width: 680px;
  }

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

@media (max-width: 560px) {
  .hub-hero {
    padding: 54px 0 50px;
  }

  .hub-hero h1 {
    font-size: clamp(2rem, 10.6vw, 3.3rem);
  }

  .hub-visual,
  .filter-panel {
    padding: 18px;
  }

  .hub-showcase {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .hub-showcase-main {
    grid-column: 1 / 3;
    grid-row: auto;
  }

  .hub-showcase img,
  .hub-showcase-main img {
    min-height: 132px;
    aspect-ratio: 4 / 3;
  }

  .hub-showcase-main img {
    aspect-ratio: 16 / 10;
  }

  .hub-route {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
  }

  .hub-route-icon {
    width: 40px;
    height: 40px;
  }

  .hub-route-action {
    grid-column: 2;
    white-space: normal;
  }

  .filter-row,
  .prompt-grid {
    grid-template-columns: 1fr;
  }

  .filter-count {
    white-space: normal;
  }

  .prompt-category-head {
    display: grid;
    gap: 4px;
  }

  .prompt-card {
    min-height: 96px;
  }
}