:root {
  color-scheme: light;
  --fg: #1f2937;
  --muted: #6b7280;
  --bg: #fffbf8;
  --card: #ffffff;
  --border: #e8e0d8;
  --link: #2563eb;
  --accent: #5a9ae8;
  --accent-soft: #eff6ff;
  --footer: #374151;
  --max: 68rem;
  --touch-min: 2.75rem;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    'PingFang SC',
    'Hiragino Sans GB',
    'Microsoft YaHei',
    sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: var(--link);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 251, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 700;
  font-size: 1.05rem;
  min-height: var(--touch-min);
}

.brand img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.45rem;
}

.site-nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.35rem 1rem;
  font-size: 0.92rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
}

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

.site-nav--desktop {
  display: none;
}

.mobile-nav {
  position: relative;
}

.mobile-nav > summary {
  list-style: none;
  cursor: pointer;
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  font-size: 0.92rem;
  font-weight: 600;
}

.mobile-nav > summary::-webkit-details-marker {
  display: none;
}

.mobile-nav[open] > summary {
  border-color: var(--accent);
  color: var(--link);
}

.mobile-nav__panel {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  min-width: 12rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
  padding: 0.35rem;
  z-index: 20;
}

.mobile-nav__panel a {
  display: flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0.5rem 0.75rem;
  text-decoration: none;
  color: var(--muted);
  border-radius: 8px;
}

.mobile-nav__panel a:hover,
.mobile-nav__panel a[aria-current='page'] {
  color: var(--link);
  background: var(--accent-soft);
}

@media (min-width: 768px) {
  .site-nav--desktop {
    display: flex;
  }

  .mobile-nav {
    display: none;
  }
}

main {
  flex: 1;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.hero {
  padding: 3rem 0 2.5rem;
}

.hero__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.hero .tagline {
  font-size: 1.1rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.hero .intro {
  margin: 0 0 1.5rem;
  max-width: 36rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  min-height: var(--touch-min);
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--secondary {
  background: var(--card);
  border-color: var(--border);
  color: var(--fg);
}

.hero__visual {
  text-align: center;
}

.hero__visual img {
  display: block;
  margin: 0 auto;
  width: min(14rem, 100%);
  border-radius: 1.35rem;
  border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

.section {
  padding: 2.5rem 0;
}

.section--alt {
  background: #fff;
  border-block: 1px solid var(--border);
}

.section h2 {
  font-size: 1.45rem;
  margin: 0 0 0.5rem;
}

.section .section-lead {
  color: var(--muted);
  margin: 0 0 1.75rem;
  max-width: 40rem;
}

.feature-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.card p {
  margin: 0;
  color: #374151;
  font-size: 0.95rem;
}

.product-intro {
  max-width: none;
  margin-top: 0.5rem;
}

.product-intro ul {
  margin: 0.75rem 0 0;
  padding-left: 1.2rem;
}

.product-intro li {
  margin: 0.45rem 0;
}

.flow-steps {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (min-width: 640px) {
  .flow-steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.flow-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.15rem;
  text-align: center;
}

.flow-step strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.flow-step span {
  color: var(--muted);
  font-size: 0.92rem;
}

.download-panel {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .download-panel {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

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

.meta-list li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 0.15rem;
}

.meta-list li:last-child {
  border-bottom: 0;
}

.meta-list strong {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.doc-top {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem 0;
  min-height: 2.5rem;
  display: none;
  align-items: center;
}

.doc-back {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0.4rem 0.75rem;
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
  margin-left: -0.5rem;
  font-size: 1rem;
  color: var(--link);
  text-decoration: none;
  border-radius: 8px;
}

.doc-back:hover {
  background: rgba(0, 0, 0, 0.05);
}

.doc-wrap {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
}

.doc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 1.25rem 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.doc-card h1 {
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}

.doc-card .meta {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.doc-card h2 {
  font-size: 1rem;
  margin: 1.25rem 0 0.4rem;
}

.doc-card p,
.doc-card li {
  margin: 0.45rem 0;
  color: #333;
}

.doc-card ul {
  padding-left: 1.2rem;
}

html.legal-embed .site-chrome {
  display: none;
}

html.legal-embed .doc-top {
  display: flex;
}

html.legal-embed .doc-wrap {
  padding-top: 0.5rem;
}

.site-footer {
  margin-top: auto;
  background: var(--footer);
  color: #e5e7eb;
  font-size: 0.88rem;
}

.site-footer a {
  color: #bfdbfe;
}

.site-footer__bottom {
  padding: 1.25rem;
  text-align: center;
  color: #9ca3af;
  font-size: 0.82rem;
  line-height: 1.6;
}

.site-footer__beian {
  display: block;
  margin-top: 0.25rem;
}