:root {
  --ink: #17211f;
  --muted: #5d6a67;
  --paper: #ffffff;
  --soft: #f3f7f6;
  --line: #d8e2df;
  --primary: #0f766e;
  --primary-dark: #0b5a54;
  --secondary: #b65f4a;
  --shadow: 0 18px 45px rgba(25, 54, 48, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.7;
}

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

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

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

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
}

.header-inner,
.hero-inner,
.section-inner,
.page-hero-inner,
.article-layout,
.faq-layout,
.footer-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 20px;
  font-weight: 750;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 6px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
}

.main-nav a {
  padding: 10px 14px;
  border-radius: 5px;
  color: #485551;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary-dark);
  background: var(--soft);
}

.main-nav .nav-download {
  margin-left: 8px;
  color: #ffffff;
  background: var(--primary);
}

.main-nav .nav-download:hover {
  color: #ffffff;
  background: var(--primary-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--ink);
  background: #ffffff;
  font-size: 23px;
  cursor: pointer;
}

.hero {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #ffffff 0%, #ffffff 52%, #f1f7f5 52%, #f1f7f5 100%);
}

.hero-inner {
  min-height: 610px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(460px, 1.08fr);
  align-items: center;
  gap: 60px;
  padding: 48px 0 50px;
}

.eyebrow,
.step-tag,
.final-inner span {
  display: inline-block;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 540px;
  margin: 15px 0 18px;
  font-size: clamp(38px, 4.2vw, 58px);
  line-height: 1.16;
  letter-spacing: 0;
}

.keep-together {
  white-space: nowrap;
}

.hero-copy > p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid transparent;
  border-radius: 5px;
  font-weight: 700;
}

.button.primary {
  color: #ffffff;
  background: var(--primary);
}

.button.primary:hover {
  background: var(--primary-dark);
}

.button.secondary {
  border-color: var(--line);
  background: #ffffff;
}

.button.light {
  color: var(--primary-dark);
  background: #ffffff;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.hero-facts li {
  padding-top: 12px;
  border-top: 2px solid var(--primary);
}

.hero-facts strong,
.hero-facts span {
  display: block;
}

.hero-facts strong {
  font-size: 14px;
}

.hero-facts span {
  color: var(--muted);
  font-size: 12px;
}

.hero-media {
  position: relative;
  height: 470px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.phone {
  position: absolute;
  margin: 0;
  overflow: hidden;
  border: 6px solid #ffffff;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.phone img,
.preview-card img {
  width: auto;
  max-width: 400px;
  height: 100%;
  object-fit: contain;
}

.phone-main {
  z-index: 3;
  height: 390px;
}

.phone-left,
.phone-right {
  z-index: 1;
  height: 300px;
  opacity: 0.92;
}

.phone-left {
  left: 3%;
  transform: translateY(22px);
}

.phone-right {
  right: 2%;
  transform: translateY(-18px);
}

.media-index {
  position: absolute;
  right: 0;
  bottom: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--secondary);
  background: #ffffff;
  color: var(--muted);
  font-size: 12px;
}

.media-index span:first-child {
  color: var(--primary);
  font-weight: 800;
}

.section {
  padding: 82px 0;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 34px;
}

.section-number {
  color: var(--secondary);
  font-size: 12px;
  font-weight: 800;
}

.section h2,
.page-hero h1,
.faq-intro h2,
.article-content h2 {
  margin: 0;
  line-height: 1.25;
  letter-spacing: 0;
}

.section h2,
.faq-intro h2 {
  font-size: 34px;
}

.interface-section {
  background: #ffffff;
}

.interface-grid {
  display: grid;
  grid-template-columns: 1.15fr repeat(3, minmax(0, 0.72fr));
  align-items: end;
  gap: 24px;
}

.interface-note {
  align-self: stretch;
  min-height: 280px;
  padding: 28px;
  border-left: 3px solid var(--primary);
  background: var(--soft);
}

.note-label {
  color: var(--secondary);
  font-size: 12px;
  font-weight: 800;
}

.interface-note h3 {
  margin: 54px 0 10px;
  font-size: 24px;
}

.interface-note p,
.feature-grid p,
.workflow-list p,
.resource-grid p,
.article-content p,
.faq-intro p {
  color: var(--muted);
}

.preview-card {
  margin: 0;
}

.preview-card img {
  width: 100%;
  height: 300px;
  padding: 8px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.preview-card.tall img {
  height: 350px;
}

.preview-card figcaption {
  padding-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-grid article {
  min-height: 250px;
  padding: 25px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.feature-grid article > span {
  color: var(--secondary);
  font-size: 12px;
  font-weight: 800;
}

.feature-grid h3 {
  margin: 50px 0 10px;
  font-size: 20px;
}

.workflow-section {
  background: #ffffff;
}

.workflow-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 80px;
}

.workflow-lead {
  max-width: 400px;
  color: var(--muted);
}

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

.workflow-list li {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 20px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.workflow-list li > span {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #ffffff;
  background: var(--primary);
  font-weight: 800;
}

.workflow-list h3,
.workflow-list p {
  margin: 0;
}

.resource-section {
  padding-top: 0;
}

.resource-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
}

.resource-grid article {
  padding: 36px;
}

.resource-grid article + article {
  border-left: 1px solid var(--line);
}

.resource-grid h2 {
  margin-top: 12px;
  font-size: 27px;
}

.resource-copy {
  margin: 14px 0;
  color: var(--muted);
}

.text-link {
  color: var(--primary-dark);
  font-weight: 750;
}

.final-action {
  color: #ffffff;
  background: var(--primary-dark);
}

.final-inner {
  min-height: 190px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.final-inner span {
  color: #a8ddd7;
}

.final-inner h2 {
  margin: 6px 0 0;
  font-size: 30px;
}

.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.footer-inner {
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}

.footer-inner p {
  margin: 4px 0;
}

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

.page-hero-inner {
  max-width: 920px;
  padding: 78px 0 70px;
}

.page-hero h1 {
  margin-top: 14px;
  font-size: 46px;
}

.page-hero p {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.article-section,
.faq-section {
  padding: 72px 0 90px;
}

.article-layout,
.faq-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 70px;
  align-items: start;
}

.article-aside {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 5px;
  padding: 22px;
  border: 1px solid var(--line);
}

.article-aside strong {
  margin-bottom: 8px;
}

.article-aside a {
  padding: 7px 0;
  color: var(--muted);
}

.article-aside a:hover {
  color: var(--primary-dark);
}

.article-content {
  max-width: 790px;
}

.article-content section {
  padding: 0 0 48px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

.article-content h2 {
  margin-top: 8px;
  font-size: 31px;
}

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

.article-content .button {
  margin-top: 22px;
}

.checklist {
  margin-top: 22px;
  padding: 18px 22px;
  border-left: 3px solid var(--secondary);
  background: var(--soft);
}

.checklist p {
  margin: 5px 0;
}

.faq-hero {
  background: #eef6f4;
}

.faq-intro {
  position: sticky;
  top: 24px;
}

.faq-intro h2 {
  margin-top: 10px;
}

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

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

.faq-list summary {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 4px;
  font-size: 17px;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary span {
  color: var(--primary);
  font-size: 24px;
}

.faq-list details p {
  margin: 0;
  padding: 0 46px 22px 4px;
  color: var(--muted);
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr 390px;
    gap: 30px;
  }

  .phone-main {
    height: 350px;
  }

  .phone-left,
  .phone-right {
    height: 250px;
  }

  .interface-grid {
    grid-template-columns: 1fr repeat(3, 0.8fr);
    gap: 14px;
  }

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

@media (max-width: 760px) {
  .header-inner,
  .hero-inner,
  .section-inner,
  .page-hero-inner,
  .article-layout,
  .faq-layout,
  .footer-inner {
    width: min(100% - 32px, 1180px);
  }

  .header-inner {
    min-height: 62px;
  }

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

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .main-nav {
    position: absolute;
    top: 62px;
    right: 16px;
    left: 16px;
    display: none;
    padding: 10px;
    border: 1px solid var(--line);
    background: #ffffff;
    box-shadow: var(--shadow);
  }

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

  .main-nav .nav-download {
    margin-left: 0;
    text-align: center;
  }

  .hero {
    background: linear-gradient(180deg, #ffffff 0%, #ffffff 54%, #f1f7f5 54%, #f1f7f5 100%);
  }

  .hero-inner {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 34px 0 28px;
  }

  .hero h1 {
    margin-top: 10px;
    font-size: 36px;
  }

  .hero-copy > p {
    font-size: 15px;
  }

  .hero-actions {
    margin-top: 20px;
  }

  .hero-facts {
    margin-top: 22px;
  }

  .hero-media {
    height: 270px;
  }

  .phone-main {
    height: 258px;
  }

  .phone-left,
  .phone-right {
    height: 190px;
  }

  .phone-left {
    left: 0;
  }

  .phone-right {
    right: 0;
  }

  .media-index {
    right: 0;
    bottom: -4px;
    gap: 9px;
    padding: 7px 10px;
  }

  .section {
    padding: 58px 0;
  }

  .section-heading {
    margin-bottom: 25px;
  }

  .section h2,
  .faq-intro h2 {
    font-size: 29px;
  }

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

  .interface-note {
    grid-column: 1 / -1;
    min-height: auto;
  }

  .interface-note h3 {
    margin-top: 24px;
  }

  .preview-card img,
  .preview-card.tall img {
    height: 220px;
  }

  .feature-grid,
  .workflow-grid,
  .resource-grid,
  .article-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid h3 {
    margin-top: 25px;
  }

  .feature-grid article {
    min-height: auto;
  }

  .workflow-grid {
    gap: 28px;
  }

  .resource-grid article + article {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .final-inner {
    min-height: 210px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }

  .page-hero-inner {
    padding: 56px 0 50px;
  }

  .page-hero h1 {
    font-size: 36px;
  }

  .article-section,
  .faq-section {
    padding: 50px 0 64px;
  }

  .article-aside,
  .faq-intro {
    position: static;
  }

  .article-aside {
    display: none;
  }

  .faq-layout {
    gap: 28px;
  }
}

@media (max-width: 430px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero-actions .button {
    flex: 1 1 140px;
  }

  .hero-facts {
    gap: 8px;
  }

  .hero-facts strong {
    font-size: 12px;
  }

  .phone-main {
    height: 245px;
  }

  .phone-left,
  .phone-right {
    height: 170px;
  }

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

  .preview-card img,
  .preview-card.tall img {
    width: auto;
    height: 300px;
    margin: 0 auto;
  }

  .final-inner h2 {
    font-size: 26px;
  }
}