:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #142033;
  --muted: #68788d;
  --line: #dbe4ef;
  --brand: #0d8f7c;
  --brand-dark: #075f56;
  --accent: #2c6be0;
  --amber: #f3b33d;
  --soft: #ecf7f5;
  --shadow: 0 22px 70px rgba(20, 32, 51, .16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 clamp(18px, 5vw, 64px);
  background: rgba(255, 255, 255, .88);
  border-bottom: 1px solid rgba(219, 228, 239, .82);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: #fff;
  background: var(--ink);
  box-shadow: 0 12px 30px rgba(20, 32, 51, .18);
}

.brand-text {
  font-size: 15px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a {
  padding: 8px 0;
}

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

.hero-cover {
  position: relative;
  display: grid;
  align-items: end;
  min-height: calc(100vh - 68px);
  padding: clamp(84px, 10vw, 132px) clamp(18px, 5vw, 64px) 42px;
  overflow: hidden;
  background: #142033;
}

.hero-bg,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(20, 32, 51, .94), rgba(20, 32, 51, .52) 48%, rgba(20, 32, 51, .12)),
    linear-gradient(0deg, rgba(20, 32, 51, .68), rgba(20, 32, 51, .08) 42%);
}

.hero-copy,
.trust-list {
  position: relative;
  z-index: 1;
}

.hero-copy {
  max-width: 760px;
  color: #fff;
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero-copy .eyebrow {
  color: #7ef2df;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(48px, 8vw, 92px);
  line-height: .98;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 620px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, .82);
  font-size: clamp(17px, 2vw, 21px);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 19px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 900;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.button.secondary {
  color: #fff;
  background: rgba(255, 255, 255, .12);
  border-color: rgba(255, 255, 255, .32);
}

.article-hero .button.secondary {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}

.trust-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 860px;
  margin: 68px 0 0;
  padding: 0;
  list-style: none;
}

.trust-list li {
  padding: 18px;
  color: #fff;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  backdrop-filter: blur(12px);
}

.trust-list strong {
  display: block;
  margin-bottom: 5px;
  font-weight: 900;
}

.trust-list span {
  display: block;
  color: rgba(255, 255, 255, .74);
  font-size: 14px;
}

section {
  padding: 76px clamp(18px, 5vw, 64px);
}

.download-strip,
.overview-section,
.process-section {
  background: #fff;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 30px;
}

.section-heading.narrow {
  max-width: 620px;
}

.section-heading h2 {
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.download-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  min-height: 174px;
  padding: 28px;
  border-right: 1px solid var(--line);
  background: #fff;
}

.download-card:last-child {
  border-right: 0;
}

.download-card:hover,
.download-card.is-current {
  background: linear-gradient(180deg, #ffffff, #effbf8);
}

.card-icon {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.download-card strong,
.download-card em {
  display: block;
}

.download-card strong {
  font-size: 20px;
  line-height: 1.25;
}

.download-card em {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  font-style: normal;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article,
.process-grid article {
  min-height: 230px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-grid span {
  display: inline-block;
  margin-bottom: 30px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 900;
}

.feature-grid h3,
.process-grid h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.26;
}

.feature-grid p,
.process-grid p {
  color: var(--muted);
}

.compare-section {
  background: #edf3f7;
}

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

.compare-row {
  display: grid;
  grid-template-columns: .8fr 1fr 1.4fr 1.2fr;
  border-top: 1px solid var(--line);
}

.compare-row:first-child {
  border-top: 0;
}

.compare-row span {
  padding: 18px;
  color: var(--muted);
  border-left: 1px solid var(--line);
}

.compare-row span:first-child {
  color: var(--ink);
  border-left: 0;
  font-weight: 900;
}

.compare-head {
  background: var(--ink);
}

.compare-head span,
.compare-head span:first-child {
  color: #fff;
  font-weight: 900;
}

.steps-section {
  background: #edf3f7;
}

.step-list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.step-list li {
  min-height: 238px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.step-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 28px;
  color: var(--brand-dark);
  background: var(--soft);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 900;
}

.step-list h3,
.article-grid h3,
.related-grid h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.28;
}

.step-list p,
.article-grid p,
.related-grid p {
  color: var(--muted);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.process-grid strong {
  display: inline-block;
  margin-bottom: 28px;
  color: var(--brand-dark);
  font-size: 13px;
}

.article-section,
.faq-section,
.content-page {
  background: #fff;
}

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

.article-grid article,
.related-grid a {
  min-height: 168px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.article-grid article:hover,
.related-grid a:hover {
  border-color: rgba(13, 143, 124, .45);
}

.tag {
  margin-bottom: 12px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 880px;
}

details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 900;
}

details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(18px, 5vw, 64px);
  color: #d8e2ee;
  background: var(--ink);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  font-weight: 900;
}

.article-hero {
  padding: 56px clamp(18px, 5vw, 64px) 34px;
  background: #edf3f7;
}

.article-hero-inner {
  max-width: 920px;
}

.article-hero h1 {
  font-size: clamp(34px, 5vw, 58px);
}

.article-hero .hero-lead {
  color: var(--muted);
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.content-page {
  padding-top: 44px;
}

.content-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  max-width: 1180px;
  margin: 0 auto;
}

.article-body {
  max-width: 780px;
}

.article-body h2 {
  margin: 34px 0 12px;
  font-size: 28px;
}

.article-body p,
.article-body li {
  color: var(--muted);
}

.article-body ul,
.article-body ol {
  padding-left: 22px;
}

.side-box {
  position: sticky;
  top: 96px;
  padding: 20px;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.side-box h2 {
  margin-bottom: 12px;
  font-size: 20px;
}

.side-box a {
  display: block;
  margin-top: 10px;
  color: var(--brand-dark);
  font-weight: 900;
}

.related-section {
  padding-top: 40px;
  background: #fff;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero-cover {
    min-height: auto;
  }

  .download-grid,
  .feature-grid,
  .article-grid,
  .related-grid,
  .step-list,
  .process-grid,
  .content-wrap {
    grid-template-columns: 1fr 1fr;
  }

  .compare-row {
    grid-template-columns: 1fr 1fr;
  }

  .download-card {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .download-card:last-child {
    border-bottom: 0;
  }

  .content-wrap {
    gap: 28px;
  }

  .side-box {
    position: static;
  }
}

@media (max-width: 680px) {
  .brand-text {
    white-space: normal;
  }

  .hero-cover {
    padding-top: 62px;
  }

  h1 {
    font-size: 44px;
  }

  .download-grid,
  .feature-grid,
  .article-grid,
  .related-grid,
  .step-list,
  .process-grid,
  .trust-list,
  .content-wrap {
    grid-template-columns: 1fr;
  }

  .compare-row {
    grid-template-columns: 1fr;
  }

  .compare-row span {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .compare-row span:first-child {
    border-top: 0;
  }

  .trust-list {
    margin-top: 42px;
  }

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