:root {
  --ink: #18211f;
  --paper: #f4f7f2;
  --white: #ffffff;
  --forest: #153b32;
  --green: #12a978;
  --green-dark: #087957;
  --coral: #ff6846;
  --yellow: #f6c94c;
  --line: #cbd8d2;
  --muted: #60706b;
  --shadow: 0 14px 36px rgba(21, 59, 50, 0.12);
  --radius: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(circle, rgba(21, 59, 50, 0.1) 1px, transparent 1px);
  background-size: 22px 22px;
  content: "";
  pointer-events: none;
}

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

a {
  color: var(--green-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(21, 59, 50, 0.18);
  background: rgba(244, 247, 242, 0.96);
  backdrop-filter: blur(12px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--forest);
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 5px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 9px 13px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--green-dark);
  background: #dff4ea;
}

.site-nav .nav-download {
  margin-left: 8px;
  color: var(--white);
  background: var(--coral);
}

.site-nav .nav-download:hover {
  color: var(--white);
  background: #e84f30;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--forest);
  background: var(--white);
  font-size: 24px;
  cursor: pointer;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.hero::after {
  position: absolute;
  right: -90px;
  bottom: -210px;
  width: 470px;
  height: 470px;
  border: 70px solid #dff4ea;
  border-radius: 50%;
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 650px;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 70px;
  padding: 56px 0 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  width: 30px;
  height: 4px;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--forest);
  line-height: 1.25;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h1 {
  max-width: 580px;
  margin-bottom: 20px;
  font-size: 72px;
}

h2 {
  margin-bottom: 0;
  font-size: 44px;
}

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

.hero-lead {
  max-width: 610px;
  margin: 0 0 26px;
  color: #40504b;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 2px solid var(--forest);
  border-radius: 4px;
  color: var(--white);
  background: var(--forest);
  font-weight: 800;
  text-decoration: none;
  box-shadow: 5px 5px 0 var(--yellow);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  color: var(--white);
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 var(--yellow);
}

.button-light {
  color: var(--forest);
  background: var(--white);
}

.button-light:hover {
  color: var(--forest);
}

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

.hero-facts li {
  position: relative;
  padding-left: 17px;
}

.hero-facts li::before {
  position: absolute;
  top: 0.8em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  content: "";
}

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

.phone-shot {
  position: absolute;
  width: min(48%, 280px);
  max-width: 400px;
  border: 7px solid var(--ink);
  border-radius: 26px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.phone-shot:first-child {
  top: 0;
  right: 8%;
  transform: rotate(3deg);
}

.phone-shot:last-child {
  bottom: 0;
  left: 5%;
  transform: rotate(-4deg);
}

.visual-note {
  position: absolute;
  top: 44%;
  right: 0;
  z-index: 3;
  max-width: 185px;
  padding: 14px 16px;
  border: 2px solid var(--forest);
  color: var(--forest);
  background: var(--yellow);
  font-weight: 800;
  line-height: 1.45;
  transform: rotate(2deg);
}

.section {
  padding: 92px 0;
}

.section-white {
  border-block: 1px solid var(--line);
  background: var(--white);
}

.section-dark {
  color: #e7f4ef;
  background: var(--forest);
}

.section-dark h2,
.section-dark h3 {
  color: var(--white);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 38px;
  border-bottom: 3px solid var(--forest);
  padding-bottom: 18px;
}

.section-dark .section-head {
  border-bottom-color: rgba(255, 255, 255, 0.28);
}

.section-kicker {
  max-width: 420px;
  color: var(--muted);
  font-weight: 700;
  text-align: right;
}

.section-dark .section-kicker {
  color: #b8d6cc;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-item {
  min-height: 260px;
  padding: 26px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--green);
  border-radius: var(--radius);
  background: var(--white);
}

.feature-item:nth-child(2n) {
  border-top-color: var(--coral);
}

.feature-number {
  display: block;
  margin-bottom: 25px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 900;
}

.feature-item p,
.guide-card p,
.faq-card p,
.story-item p {
  margin: 0;
  color: var(--muted);
}

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

.preview-figure {
  margin: 0;
}

.preview-figure img {
  width: 100%;
  max-width: 400px;
  border: 5px solid #091d18;
  border-radius: 24px;
  background: var(--white);
  box-shadow: 8px 8px 0 rgba(255, 104, 70, 0.8);
}

.preview-figure:nth-child(2n) img {
  box-shadow: 8px 8px 0 rgba(246, 201, 76, 0.9);
}

.preview-figure figcaption {
  padding: 18px 5px 0;
  color: #cce6dd;
  font-size: 14px;
}

.preview-figure strong {
  display: block;
  margin-bottom: 4px;
  color: var(--white);
  font-size: 17px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 34px;
}

.path-panel {
  padding: 32px;
  border: 2px solid var(--forest);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 9px 9px 0 #cce9df;
}

.path-panel.accent {
  color: var(--white);
  background: var(--forest);
  box-shadow: 9px 9px 0 var(--coral);
}

.path-panel.accent h3,
.path-panel.accent a {
  color: var(--white);
}

.path-list {
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}

.path-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}

.path-list b {
  color: var(--coral);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 900;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 2px solid var(--forest);
  background: var(--white);
}

.stat {
  padding: 26px 18px;
  border-right: 1px solid var(--line);
  text-align: center;
}

.stat:last-child {
  border-right: 0;
}

.stat strong {
  display: block;
  color: var(--forest);
  font-size: 30px;
}

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

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

.quote {
  margin: 0;
  padding: 24px;
  border-left: 5px solid var(--coral);
  background: #e9f4ef;
}

.quote p {
  margin: 0 0 14px;
}

.quote cite {
  color: var(--green-dark);
  font-style: normal;
  font-weight: 800;
}

.faq-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

summary {
  position: relative;
  padding: 18px 50px 18px 20px;
  color: var(--forest);
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  position: absolute;
  top: 15px;
  right: 18px;
  color: var(--coral);
  content: "+";
  font-size: 25px;
  line-height: 1;
}

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

.detail-body {
  padding: 0 20px 20px;
  color: var(--muted);
}

.download-band {
  padding: 70px 0;
  color: var(--white);
  background: var(--coral);
}

.download-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.download-band h2 {
  color: var(--white);
}

.download-band p {
  max-width: 650px;
  margin: 10px 0 0;
}

.download-band .button {
  flex: 0 0 auto;
  box-shadow: 5px 5px 0 var(--yellow);
}

.site-footer {
  padding: 48px 0 24px;
  color: #bed1ca;
  background: #0f2822;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 0.9fr;
  gap: 50px;
  padding-bottom: 34px;
}

.footer-grid h2,
.footer-grid h3 {
  color: var(--white);
}

.footer-grid h2 {
  font-size: 25px;
}

.footer-grid h3 {
  font-size: 17px;
}

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

.footer-links a {
  color: #d8ebe4;
}

.disclaimer {
  margin: 0;
  color: #a8c0b7;
  font-size: 13px;
}

.copyright {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 13px;
}

.page-hero {
  padding: 86px 0 68px;
  color: var(--white);
  background: var(--forest);
}

.page-hero .eyebrow {
  color: var(--yellow);
}

.page-hero h1 {
  max-width: 900px;
  color: var(--white);
  font-size: 64px;
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: #c6ded5;
  font-size: 18px;
}

.breadcrumb {
  margin-bottom: 24px;
  color: #acd1c4;
  font-size: 14px;
}

.breadcrumb a {
  color: var(--white);
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 46px;
  align-items: start;
}

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

.article-content > section {
  margin-bottom: 64px;
  scroll-margin-top: 95px;
}

.article-content h2 {
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 3px solid var(--forest);
  font-size: 34px;
}

.article-content h3 {
  margin-top: 28px;
}

.article-content p {
  margin: 0 0 16px;
}

.toc {
  position: sticky;
  top: 96px;
  padding: 24px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--coral);
  background: var(--white);
}

.toc strong {
  display: block;
  margin-bottom: 14px;
  color: var(--forest);
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--green-dark);
}

.steps {
  position: relative;
  display: grid;
  gap: 22px;
}

.step {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 22px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.step-index {
  display: grid;
  width: 58px;
  height: 58px;
  border: 2px solid var(--forest);
  border-radius: 50%;
  place-items: center;
  color: var(--white);
  background: var(--green);
  font-size: 20px;
  font-weight: 900;
}

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

.check-list,
.plain-list {
  margin: 16px 0;
  padding-left: 22px;
}

.check-list li,
.plain-list li {
  margin-bottom: 9px;
}

.notice {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 6px solid var(--coral);
  background: #fff2ee;
}

.inline-preview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 30px;
  align-items: center;
  margin: 26px 0;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--white);
}

.inline-preview img {
  width: 100%;
  max-width: 240px;
  border: 4px solid var(--ink);
  border-radius: 18px;
}

.faq-group {
  display: grid;
  gap: 12px;
}

.faq-group details {
  box-shadow: 4px 4px 0 #dce8e3;
}

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

.faq-card,
.guide-card,
.story-item {
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

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

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-link {
  padding: 22px;
  border: 2px solid var(--forest);
  color: var(--forest);
  background: var(--white);
  font-weight: 800;
  text-decoration: none;
}

.related-link:hover {
  color: var(--white);
  background: var(--forest);
}

.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 500ms ease, transform 500ms ease;
}

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

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

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

@media (max-width: 980px) {
  h1 {
    font-size: 58px;
  }

  h2 {
    font-size: 38px;
  }

  .page-hero h1 {
    font-size: 54px;
  }

  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 34px;
  }

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

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

  .toc {
    position: static;
    order: -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 14px;
    left: 14px;
    display: none;
    padding: 12px;
    border: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

  .site-nav .nav-download {
    margin-left: 0;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    padding-top: 50px;
  }

  h1 {
    font-size: 46px;
  }

  h2 {
    font-size: 34px;
  }

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

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

  .section {
    padding: 68px 0;
  }

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

  .section-kicker {
    text-align: left;
  }

  .path-grid,
  .quotes-grid,
  .footer-grid,
  .function-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

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

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

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

  .faq-preview {
    grid-template-columns: 1fr;
  }

  .inline-preview {
    grid-template-columns: 1fr;
  }

  .inline-preview img {
    max-width: 280px;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 18px;
  }

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

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 31px;
  }

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

  .hero-visual {
    min-height: 410px;
  }

  .phone-shot {
    width: 54%;
    border-width: 5px;
    border-radius: 20px;
  }

  .visual-note {
    max-width: 145px;
    font-size: 13px;
  }

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

  .preview-figure img {
    width: min(100%, 340px);
    margin-inline: auto;
  }

  .step {
    grid-template-columns: 48px 1fr;
    gap: 14px;
  }

  .step-index {
    width: 46px;
    height: 46px;
  }

  .path-panel,
  .inline-preview {
    padding: 22px;
  }
}