:root{
  --bg:#f7f8fa;
  --surface:#ffffff;
  --surface-2:#f1f3f7;
  --line:#e6e8ee;
  --text:#1a1d24;
  --muted:#8a93a6;
  --accent:#2563eb;
  --accent-soft:#eef3ff;
  --shadow:0 1px 2px rgba(16,24,40,.04), 0 6px 20px rgba(16,24,40,.06);
  --shadow-hover:0 6px 14px rgba(16,24,40,.08), 0 18px 40px rgba(16,24,40,.10);
  --radius:16px;
}

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

*{
  -webkit-tap-highlight-color:transparent;
  -webkit-touch-callout:none;
}

.tab,
.card,
.pan-btn{
  -webkit-user-select:none;
  user-select:none;
}

body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.65;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  -webkit-font-smoothing:antialiased;
}

/* ===== 顶部标题 ===== */
.site-header{
  text-align:center;
  padding:60px 20px 26px;
}
.site-header h1{
  font-size:34px;
  letter-spacing:3px;
  font-weight:700;
  background:linear-gradient(180deg,#111723,#2b3344);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
}
.site-header .subtitle{
  color:var(--muted);
  font-size:14px;
  margin-top:10px;
  letter-spacing:1px;
}
.site-header.small{
  text-align:left;
  padding:16px 24px;
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(12px);
  position:sticky;top:0;z-index:20;
}
.back{
  color:var(--muted);
  text-decoration:none;
  font-size:14px;
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  transition:.2s;
}
.back:hover{color:var(--text);border-color:#d5dae3;box-shadow:var(--shadow)}

/* ===== 分区栏（顶部 + 滑动下划线） ===== */
.tabbar{
  display:flex;
  justify-content:center;
  gap:6px;
  position:sticky;
  top:0;
  z-index:15;
  padding:0 16px;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.tabbar::-webkit-scrollbar{display:none}

.tab{
  flex-shrink:0;
  background:none;
  border:none;
  color:var(--muted);
  font-size:15px;
  font-weight:500;
  padding:18px 22px;
  cursor:pointer;
  position:relative;
  white-space:nowrap;
  transition:color .3s cubic-bezier(.4,0,.2,1),
             font-weight .3s cubic-bezier(.4,0,.2,1);
}
.tab:hover{color:var(--text)}

.tab.active{
  color:var(--text);
  font-weight:600;
}

.tab-underline{
  position:absolute;
  bottom:0;
  height:3px;
  border-radius:3px 3px 0 0;
  background:linear-gradient(90deg,#1a1d24,#3b4457);
  transition:left .32s cubic-bezier(.4,0,.2,1),
             width .32s cubic-bezier(.4,0,.2,1);
  pointer-events:none;
}

/* ===== 网格 ===== */
.container{
  width:100%;
  max-width:1140px;
  margin:0 auto;
  padding:36px 24px 72px;
  flex:1;
}
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(250px,1fr));
  gap:24px;
}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  text-decoration:none;
  color:inherit;
  transition:.28s cubic-bezier(.4,0,.2,1);
  display:flex;
  flex-direction:column;
  box-shadow:var(--shadow);
}
.card:hover{
  transform:translateY(-5px);
  border-color:#d5dae3;
  box-shadow:var(--shadow-hover);
}
.card .thumb{
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
  background:var(--surface-2);
  display:block;
  border-bottom:1px solid var(--line);
}
.card .info{padding:16px 18px 18px}
.card .name{font-size:16px;font-weight:600;margin-bottom:6px;letter-spacing:.2px}
.card .summary{
  font-size:13px;
  color:var(--muted);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}

.empty{text-align:center;color:var(--muted);padding:72px 0;font-size:15px}

/* ===== 详情页 ===== */
.detail{padding-top:40px;max-width:860px}
.detail h2{font-size:28px;font-weight:700;margin-bottom:20px;letter-spacing:.5px}
.detail .cover{
  width:100%;
  border-radius:var(--radius);
  border:1px solid var(--line);
  margin-bottom:28px;
  box-shadow:var(--shadow);
  display:block;
}
.detail .intro{
  color:#4a5262;
  font-size:15.5px;
  line-height:1.85;
  margin-bottom:36px;
  white-space:pre-wrap;
}
.detail .intro p{margin-bottom:14px}

.pan-title{
  font-size:13px;
  color:var(--muted);
  margin-bottom:14px;
  letter-spacing:2px;
  font-weight:500;
  text-transform:uppercase;
  display:flex;align-items:center;gap:12px;
}
.pan-title::after{content:"";flex:1;height:1px;background:var(--line)}

.pan-list{display:flex;flex-direction:column;gap:14px}
.pan-btn{
  display:flex;
  align-items:center;
  gap:14px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px 20px;
  text-decoration:none;
  color:var(--text);
  font-size:16px;
  transition:.22s cubic-bezier(.4,0,.2,1);
  box-shadow:var(--shadow);
}
.pan-btn:hover{
  border-color:var(--accent);
  transform:translateY(-2px);
  box-shadow:var(--shadow-hover);
}
.pan-btn .logo{
  width:30px;height:30px;flex-shrink:0;
  border-radius:50%;
  box-shadow:0 2px 8px rgba(16,24,40,.12);
}
.pan-btn .label{font-weight:600;letter-spacing:.3px}
.pan-btn .code{
  margin-left:auto;
  font-size:12.5px;
  color:var(--muted);
  background:var(--surface-2);
  padding:5px 12px;
  border-radius:8px;
  font-weight:500;
}
.pan-btn .arrow{
  margin-left:auto;
  color:var(--accent);
  font-weight:600;
  font-size:14px;
  transition:.2s;
}
.pan-btn:hover .arrow{transform:translateX(3px)}

/* ===== 底 ===== */
.site-footer{
  text-align:center;
  color:var(--muted);
  font-size:13px;
  padding:28px;
  border-top:1px solid var(--line);
  background:#fff;
}

/* ===== 手机适配 ===== */
@media (max-width:600px){
  .site-header{padding:40px 16px 22px}
  .site-header h1{font-size:26px;letter-spacing:2px}
  .tabbar{justify-content:flex-start;padding:0 10px}
  .tab{padding:16px 16px;font-size:14.5px}
  .container{padding:24px 16px 56px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px}
  .detail h2{font-size:22px}
  .detail .intro{font-size:15px}
}