:root {
  --color-ink: #1a1a1a;
  --color-deep-gray: #333333;
  --color-gray: #666666;
  --color-light-gray: #999999;
  --color-border: #e5e5e5;
  --color-bg: #fafafa;
  --color-white: #ffffff;
  --color-accent: #bfa065;
  --color-accent-dark: #a68b50;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Monaco, Inconsolata, "Fira Code", "Source Code Pro", monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-ink);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-deep-gray);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-dark);
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 1px;
}

.site-brand span {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 32px;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray);
}

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

/* Hero */
.hero {
  padding: 120px 24px 100px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-gray);
  margin-bottom: 40px;
}

.hero .tagline {
  display: inline-block;
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--color-light-gray);
  background: var(--color-white);
}

/* Section */
.section {
  padding: 80px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 48px;
  text-align: center;
  letter-spacing: 1px;
}

/* Products */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
}

.product-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: linear-gradient(135deg, #f5f5f5 0%, #ebebeb 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-gray);
  font-size: 0.875rem;
}

.product-content {
  padding: 28px;
}

.product-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.product-content p {
  color: var(--color-gray);
  font-size: 0.9375rem;
  margin-bottom: 20px;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-accent-dark);
}

.product-link:hover {
  color: var(--color-ink);
}

/* Content */
.content {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px;
}

.content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 32px;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
}

.content p {
  margin-bottom: 16px;
  color: var(--color-deep-gray);
}

.content ul,
.content ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.content li {
  margin-bottom: 8px;
}

.content code {
  font-family: var(--font-mono);
  background: #f0f0f0;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}

.content pre {
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
  margin-bottom: 20px;
}

.content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 20px;
  margin: 20px 0;
  color: var(--color-gray);
  font-style: italic;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 24px;
  text-align: center;
  color: var(--color-light-gray);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--color-gray);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-ink);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-deep-gray);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

/* Product detail */
.product-hero {
  padding: 80px 24px 40px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.product-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.product-hero .lead {
  font-size: 1.125rem;
  color: var(--color-gray);
  margin-bottom: 32px;
}

.product-screenshot {
  max-width: 900px;
  margin: 0 auto 60px;
  padding: 0 24px;
}

.product-screenshot img {
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

/* Features list */
.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin: 40px 0;
}

.feature-item {
  padding: 24px;
  background: var(--color-white);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.feature-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--color-gray);
  margin: 0;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 0.9375rem;
}

.content th,
.content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.content th {
  font-weight: 600;
  color: var(--color-ink);
  background: var(--color-white);
}

.content td {
  color: var(--color-deep-gray);
}

.content tr:hover td {
  background: rgba(0, 0, 0, 0.02);
}

/* Changelog */
.changelog-entry {
  margin-bottom: 48px;
}

.changelog-entry h2 {
  font-size: 1.25rem;
  margin-top: 0;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.changelog-entry h3 {
  font-size: 1rem;
  color: var(--color-accent-dark);
  margin-top: 20px;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.changelog-entry ul {
  padding-left: 20px;
}

.changelog-entry li {
  margin-bottom: 6px;
  color: var(--color-deep-gray);
}

/* Feature item as link */
a.feature-item {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

a.feature-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  color: inherit;
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    padding: 80px 20px 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .subtitle {
    font-size: 1rem;
  }

  .header-inner {
    height: 56px;
  }

  .site-nav {
    gap: 20px;
  }

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

  .product-hero h1 {
    font-size: 1.75rem;
  }
}