/* 基础重置与变量 */
:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #0066cc;
  --accent-hover: #0052a3;
  --border: #e0e0e0;
  --card-bg: #fff;
  --code-bg: #f5f5f5;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

/* 导航 */
nav {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
}

nav .container {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

nav .logo-icon {
  width: 24px;
  height: 24px;
  display: block;
}

nav .links a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

nav .links a.github-link {
  display: inline-flex;
  align-items: center;
  margin-left: 1.5rem;
}

nav .links a:hover {
  color: var(--accent);
}

/* 主容器 */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 首页英雄区 */
.hero {
  padding: 5rem 2rem;
  text-align: center;
}

.hero-logo {
  margin-bottom: 1.5rem;
}

.hero-logo svg {
  width: 80px;
  height: 80px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero .cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
}

.hero .cta:hover {
  background: var(--accent-hover);
}

/* 特性区块 */
.features {
  padding: 4rem 2rem;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.features h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 3rem;
}

.features .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.features .card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.features .card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.features .card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* 页面主内容 */
main {
  padding: 3rem 2rem;
}

main h1 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

main h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

main h2:first-of-type {
  border-top: none;
  margin-top: 0;
}

main h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.75rem;
}

main p {
  margin-bottom: 1rem;
  color: var(--fg);
}

main ul, main ol {
  margin: 1rem 0 1rem 1.5rem;
}

main li {
  margin-bottom: 0.5rem;
}

/* 代码块 */
code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: "SF Mono", Monaco, "Cascadia Code", monospace;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  padding: 0;
  background: none;
  font-size: 0.875rem;
}

/* 提示框 */
.tip {
  background: #e8f4fc;
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
}

.tip p {
  margin: 0;
  color: var(--fg);
}

/* 页脚 */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

/* 响应式 */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1.1rem;
  }

  nav .links a {
    margin-left: 1rem;
    font-size: 0.9rem;
  }
}