:root {
  --bg: #0b0d12;
  --bg-soft: #12151d;
  --card: #161a24;
  --card-hover: #1c2230;
  --border: #242a37;
  --text: #e7ebf3;
  --muted: #8b94a7;
  --accent: #6ea8fe;
  --accent-2: #9d7bff;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fc; --bg-soft: #eef2f9; --card: #ffffff; --card-hover: #f3f6fc;
    --border: #e2e8f2; --text: #1a2030; --muted: #5d6577; --accent: #2f6bff; --accent-2: #7a4fe0;
    --shadow: 0 8px 30px rgba(40, 60, 110, 0.10);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 80% -10%, rgba(110,168,254,0.10), transparent 60%),
              radial-gradient(900px 500px at -10% 0%, rgba(157,123,255,0.10), transparent 55%),
              var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft Yahei", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 48px 20px 80px; }

header.site { margin-bottom: 28px; }
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; font-size: 24px; box-shadow: var(--shadow);
}
h1.title { font-size: 30px; margin: 0; letter-spacing: -0.02em; }
.subtitle { color: var(--muted); margin: 8px 0 0; font-size: 15px; }
.meta-line { color: var(--muted); font-size: 13px; margin-top: 10px; }
.meta-line b { color: var(--text); }

.controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin: 26px 0 18px; }
.search-box { position: relative; flex: 1; min-width: 220px; }
.search-box input {
  width: 100%; padding: 12px 14px 12px 40px; border-radius: 11px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); font-size: 15px; outline: none;
}
.search-box input:focus { border-color: var(--accent); }
.search-box svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--muted); }

.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.cat-tab {
  padding: 8px 15px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-soft); color: var(--muted); cursor: pointer; font-size: 14px; transition: all .15s;
}
.cat-tab:hover { color: var(--text); border-color: var(--accent); }
.cat-tab.active { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent; }
.cat-tab .n { opacity: .7; font-size: 12px; margin-left: 5px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 18px; }
.tool-card {
  display: flex; flex-direction: column; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  transition: transform .15s, border-color .15s, background .15s;
}
.tool-card:hover { transform: translateY(-3px); border-color: var(--accent); background: var(--card-hover); }
.thumb { aspect-ratio: 16 / 10; background: var(--bg-soft); overflow: hidden; border-bottom: 1px solid var(--border); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb.placeholder { display: grid; place-items: center; font-size: 40px; color: var(--muted); }
.card-body { padding: 15px 16px 17px; display: flex; flex-direction: column; gap: 7px; flex: 1; }
.card-top { display: flex; align-items: center; gap: 8px; }
.badge { font-size: 12px; padding: 3px 9px; border-radius: 999px; background: rgba(110,168,254,0.14); color: var(--accent); }
.date { font-size: 12px; color: var(--muted); margin-left: auto; }
.card-title { font-size: 17px; font-weight: 650; margin: 2px 0 0; }
.card-sub { font-size: 13.5px; color: var(--muted); flex: 1; }
.open-btn { margin-top: 6px; font-size: 13px; color: var(--accent); font-weight: 600; }

.empty { text-align: center; color: var(--muted); padding: 60px 0; }
footer.site { margin-top: 56px; color: var(--muted); font-size: 13px; text-align: center; border-top: 1px solid var(--border); padding-top: 24px; }
footer.site a { color: var(--accent); text-decoration: none; }