body {
  font-family: Helvetica, Arial, "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #4a4a4a;
  background: #f6f8fb;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(16, 18, 24, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
}

.brand img {
  width: 28px;
  height: 28px;
}

.hero {
  background: linear-gradient(135deg, #16181f 0%, #222733 45%, #1a1f2b 100%);
  color: #fff;
  padding: 72px 0 56px;
}

.hero-grid {
  align-items: center;
}

.hero-title {
  font-size: 64px;
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: 18px;
}

.hero-title .plus {
  display: block;
  color: #8ab4ff;
}

.hero-subtitle {
  color: #d8deea;
  font-size: 20px;
  margin-bottom: 12px;
}

.download-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.download-meta {
  color: #c6d0e3;
  font-size: 14px;
}

.download-button {
  min-height: 58px;
  font-size: 18px;
  font-weight: 700;
  justify-content: space-between;
  padding: 0 20px 0 22px;
  background: #1677ff;
  color: #fff;
  border-color: #1677ff;
  box-shadow: 0 14px 30px rgba(22, 119, 255, 0.35);
  border-radius: 12px;
}

.download-button:hover {
  transform: translateY(-1px);
  background: #0d6efd;
}

.download-version {
  font-size: 13px;
  color: #dce8ff;
  background: rgba(255, 255, 255, 0.14);
  padding: 4px 10px;
  border-radius: 999px;
}

.download-tip {
  font-size: 13px;
  color: #b7c2d8;
}

.hero-preview {
  background: linear-gradient(180deg, #fbfcff 0%, #eef3ff 100%);
  border-radius: 22px;
  padding: 18px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  width: 82%;
  margin-left: auto;
}

.hero-preview img {
  width: 100%;
  height: auto;
  border-radius: 14px;
}

.section {
  padding: 64px 0;
  background: transparent;
}

.section-title {
  font-size: 38px;
  line-height: 1.25;
  color: #1e2430;
  margin-bottom: 16px;
  text-align: center;
  font-weight: 700;
}

.section-intro {
  max-width: 920px;
  margin: 0 auto 18px;
  color: #5d6679;
}

.feature-row {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  align-items: center;
  margin: 0;
}

.feature-text,
.feature-text.right,
.feature-image,
.feature-image.left {
  padding: 0;
}

.feature-image,
.feature-image.left {
  width: calc(62% - 24px);
}

.feature-text,
.feature-text.right {
  width: calc(38% - 24px);
}

.feature-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8px 0;
  overflow-wrap: anywhere;
  text-align: left;
}

.feature-image {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

.feature-image img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}

.feature-text h3 {
  font-size: 24px;
  color: #1f2532;
  margin: 0 0 18px;
  font-weight: 700;
  line-height: 1.35;
  text-align: left;
}

.feature-text ul {
  padding-left: 20px;
  list-style: disc;
  margin: 0;
}

.feature-text ul ul {
  margin: 6px 0 0;
  padding-left: 20px;
}

.feature-text li {
  margin-bottom: 8px;
  color: #60697a;
  font-size: 16px;
  line-height: 1.8;
}

.feature-text li:last-child {
  margin-bottom: 0;
}

.compact-text {
  padding: 8px 0;
}

.compact-text h3 {
  font-size: clamp(22px, 2.2vw, 24px);
  margin: 0 0 18px;
  text-align: left;
}

.compact-text ul {
  padding-left: 28px;
  list-style: disc;
  margin: 0;
  max-width: 100%;
  text-align: left;
}

.compact-text ul ul {
  padding-left: 20px;
  margin-top: 10px;
  list-style: circle;
}

.compact-text li {
  font-size: clamp(14px, 1.35vw, 16px);
  line-height: 1.8;
  margin-bottom: 8px;
}

.compact-text li strong,
.compact-text li code {
  display: inline-block;
}

.edge-space h3 {
  padding-left: 0;
}

.edge-space ul {
  padding-left: 28px;
  max-width: 100%;
}

.edge-space ul ul {
  padding-left: 20px;
}

.annotate-row {
  align-items: center;
}

.annotate-image,
.annotate-text {
  display: flex;
}

.annotate-image img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.annotate-text {
  padding: 8px 0;
  flex-direction: column;
  justify-content: center;
}

.annotate-content {
  width: 100%;
  padding: 0;
}

.annotate-text h3 {
  width: 100%;
  margin: 0 0 18px;
  font-size: 24px;
  padding-left: 0;
}

.annotate-text > .annotate-content > ul {
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding-left: 24px;
  display: block;
}

.annotate-text > ul > li {
  margin: 0 0 8px;
}

.annotate-text ul ul {
  margin: 4px 0 0;
  padding-left: 20px;
  display: block;
}

.annotate-text ul ul li {
  margin: 0 0 2px;
}

.annotate-text li {
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: 6px;
}

.divider {
  margin: 44px 0;
  border: 0;
  border-top: 1px solid #dde5f1;
}

.footer {
  padding: 28px 0 40px;
  color: #8b94a7;
  text-align: center;
}

.footer strong {
  color: #4f5768;
}

.muted {
  color: #7e8798;
}

code {
  padding: 2px 6px;
  background: #f4f6fb;
  border-radius: 6px;
  color: #28407c;
}

@media (max-width: 991px) {
  .hero-title {
    font-size: 48px;
  }

  .feature-text,
  .feature-image,
  .feature-text.right,
  .feature-image.left {
    width: 100%;
  }

  .feature-row {
    gap: 24px;
  }

  .annotate-text {
    min-height: auto;
    padding: 0;
  }

  .annotate-content {
    padding: 0;
  }
}

@media (max-width: 767px) {
  .annotate-text > ul {
    padding-left: 22px;
  }
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    gap: 8px;
    padding: 14px 0;
    flex-direction: column;
  }

  .hero {
    padding-top: 48px;
  }

  .hero-title {
    font-size: 38px;
  }

  .section-title {
    font-size: 30px;
  }

  .download-button {
    font-size: 16px;
  }
}