/* Shared styles — 极光鸟 文档页 */
:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4d;
  --text: #e8eef4;
  --muted: #8fa3b8;
  --accent: #3d9eff;
  --accent-dim: #2563a8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.site-header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.site-header .inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand:hover .brand-text {
  color: var(--accent);
}

.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 10px;
}

.brand-text {
  line-height: 1.2;
}

.nav-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
}

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

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 8px;
  line-height: 1.3;
}

.sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

h2 {
  font-size: 1.15rem;
  margin: 28px 0 12px;
  color: var(--text);
  border-left: 3px solid var(--accent);
  padding-left: 12px;
}

p,
li {
  color: #c5d0dc;
  margin: 0 0 12px;
}

ul,
ol {
  padding-left: 1.35em;
  margin: 0 0 16px;
}

footer.site-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
}

footer.site-footer a {
  margin-right: 16px;
}

/* 官网扩展 */
.hero {
  text-align: center;
  padding: 40px 0 48px;
}

.hero-logo {
  display: block;
  width: min(112px, 26vw);
  height: auto;
  margin: 0 auto 20px;
  object-fit: contain;
  border-radius: 22px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
}

.hero .lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 560px;
  margin: 16px auto 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 40px 0;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--accent);
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
}

.screens {
  margin: 48px auto;
  padding: 0 20px;
  max-width: 1100px;
}

.screens h2 {
  text-align: center;
  border: none;
  padding: 0;
  font-size: 1.35rem;
  margin-bottom: 24px;
}

/* flex + justify-content:center：最后一行不满时也整体水平居中（grid 默认会靠左） */
.screen-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.screen-card {
  margin: 0;
  width: min(100%, 300px);
  flex: 0 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.screen-card figcaption {
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.screen-card img {
  display: block;
  width: 100%;
  height: auto;
  margin-inline: auto;
  vertical-align: middle;
  background: #121820;
  min-height: 200px;
  object-fit: cover;
}

.contact-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  margin-top: 32px;
}

.contact-box strong {
  color: var(--text);
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.45rem;
  }
}