:root{
  --bg:#0f172a;
  --card:#1e293b;
  --card-hover:#2d3a4f;
  --border:#334155;
  --text:#f1f5f9;
  --muted:#94a3b8;
  --accent:#3b82f6;
  --accent-soft:#1e3a5f;
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
  font-family:Inter,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg);
  color:var(--text);
  padding:0 24px;
}
.container{max-width:1280px;margin:auto}

/* 导航栏 */
.nav{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:24px 0;
}
.logo{
  font-weight:700;
  font-size:1.4rem;
  background:linear-gradient(135deg,#60a5fa,#3b82f6);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}
.lang-link{
  color:var(--muted);
  text-decoration:none;
  border:1px solid var(--border);
  padding:6px 16px;
  border-radius:40px;
  font-size:.9rem;
  transition:0.2s;
}
.lang-link:hover{
  border-color:var(--accent);
  color:var(--text);
}

.hero{text-align:center;padding:10px 0 20px;}
.hero h1{font-size:3rem;margin-bottom:12px;}
.hero p{color:var(--muted);font-size:1.1rem;}

.search{display:flex;justify-content:center;margin:30px 0;}
.search input{
  width:500px;max-width:100%;
  padding:14px 24px;
  border-radius:60px;
  border:1px solid var(--border);
  background:var(--card);
  color:var(--text);
  font-size:1rem;
  transition:0.2s;
}
.search input:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft);
}

.category-nav{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:20px 0 40px;
  justify-content:center;
}
.category-btn{
  background:var(--card);
  border:1px solid var(--border);
  color:var(--muted);
  padding:8px 20px;
  border-radius:40px;
  font-size:.9rem;
  font-weight:500;
  cursor:pointer;
  transition:all 0.2s;
}
.category-btn:hover{
  border-color:var(--accent);
  color:var(--text);
}
.category-btn.active{
  background:var(--accent);
  border-color:var(--accent);
  color:white;
}

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
  margin:40px 0 80px;
}
.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  transition:0.25s;
  text-decoration:none;
  color:inherit;
  display:block;
}
.card:hover{
  transform:translateY(-5px);
  border-color:var(--accent);
  background:var(--card-hover);
  box-shadow:0 12px 30px -10px rgba(0,0,0,0.5);
}
.card h3{
  margin-bottom:8px;
  font-size:1.2rem;
  display:flex;
  align-items:center;
  gap:8px;
}
.card p{
  color:var(--muted);
  font-size:.9rem;
  line-height:1.5;
}
.card[data-key] h3::before{
  content:'⚙️';
  font-size:1.2rem;
  filter:grayscale(0.5);
  opacity:0.8;
}
.card[data-key="jwt"] h3::before{content:'🔐';}
.card[data-key="git"] h3::before{content:'📚';}
.card[data-key="api"] h3::before{content:'🌐';}
.card[data-key="nginx"] h3::before{content:'🌍';}
.card[data-key="docker"] h3::before{content:'🐳';}
.card[data-key="regex"] h3::before{content:'🔍';}
.card[data-key="timestamp"] h3::before{content:'⏰';}
.card[data-key="base64"] h3::before{content:'🔒';}
.card[data-key="diff"] h3::before{content:'🔄';}
.card[data-key="calc"] h3::before{content:'🧮';}
.card[data-key="convert"] h3::before{content:'🔄';}
.card[data-key="http"] h3::before{content:'🌍';}
.card[data-key="ua"] h3::before{content:'🖥️';}
.card[data-key="short"] h3::before{content:'🔗';}
.card[data-key="flex"] h3::before{content:'🎨';}
.card[data-key="icon"] h3::before{content:'🔤';}
.card[data-key="grid"] h3::before{content:'📐';}
.card[data-key="gradient"] h3::before{content:'🌈';}
.card[data-key="shadow"] h3::before{content:'🎭';}
.card[data-key="color"] h3::before{content:'🎨';}
.card[data-key="svg"] h3::before{content:'🖼️';}
.card[data-key="qr"] h3::before{content:'📱';}
.card[data-key="md"] h3::before{content:'📝';}
.card[data-key="image"] h3::before{content:'🖼️';}
.card[data-key="prompt"] h3::before{content:'🤖';}
.card[data-key="chat"] h3::before{content:'🧹';}
.card[data-key="token"] h3::before{content:'📊';}
.card[data-key="polish"] h3::before{content:'✍️';}
.card[data-key="json"] h3::before{content:'📋';}
.card[data-key="faker"] h3::before{content:'🎲';}
.card[data-key="tutorial"] h3::before{content:'📚';}
.card[data-key="mindmap"] h3::before{content:'🧠';}
.card[data-key="meme"] h3::before{content:'💭';}
.card[data-key="emoji"] h3::before{content:'🙂';}
.card[data-key="editor"] h3::before{content:'📑';}
.card[data-key="blog"] h3::before{content:'📖';}
footer{
  text-align:center;
  padding:40px 0 30px;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:.9rem;
}
footer a{

  color:var(--muted);
text-decoration: none;
}