:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --ink: #1f2430;
  --ink-soft: #5b6472;
  --line: #e6e9f0;
  --brand: #4f46e5;
  --brand-soft: #eef0ff;
  --shadow: 0 1px 2px rgba(20, 30, 60, .04), 0 8px 24px rgba(20, 30, 60, .06);
  --radius: 14px;

  --c-ai_tech: #6366f1;
  --c-finance: #0ea5e9;
  --c-crypto: #f59e0b;
  --c-ecommerce: #10b981;
  --c-sidehustle: #ec4899;
  --c-world: #8b5cf6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

/* ---- 顶栏 ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 20px 28px;
  background: linear-gradient(120deg, #4f46e5 0%, #6d5ef0 55%, #8b5cf6 100%);
  color: #fff;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 52px; height: 52px; border-radius: 14px;
  background: rgba(255, 255, 255, .16);
  display: grid; place-items: center; font-size: 28px;
}
.topbar h1 { margin: 0; font-size: 22px; letter-spacing: .5px; }
.tagline { margin: 3px 0 0; font-size: 13px; opacity: .85; }

.stats { display: flex; gap: 12px; }
.stat {
  background: rgba(255, 255, 255, .14);
  border-radius: 12px;
  padding: 8px 16px;
  text-align: center;
  min-width: 84px;
}
.stat .num { display: block; font-size: 22px; font-weight: 700; line-height: 1.1; }
.stat .lbl { font-size: 12px; opacity: .85; }

/* ---- 工具条 ---- */
.toolbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; flex-direction: column; gap: 12px;
  padding: 16px 28px;
  background: rgba(245, 247, 251, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
}
.chip:hover { border-color: var(--brand); color: var(--brand); }
.chip.active { background: var(--brand); border-color: var(--brand); color: #fff; }

.controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.controls select, .controls input {
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 12px;
  font-size: 14px;
  background: #fff;
  color: var(--ink);
  outline: none;
}
.controls input { flex: 1; min-width: 200px; }
.controls input:focus, .controls select:focus { border-color: var(--brand); }

.sort { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.sort button {
  border: none; background: #fff; color: var(--ink-soft);
  padding: 0 14px; height: 38px; cursor: pointer; font-size: 13px;
}
.sort button.active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }

.btn-collect {
  height: 38px; padding: 0 16px;
  border: none; border-radius: 10px;
  background: var(--brand); color: #fff;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: filter .15s;
}
.btn-collect:hover { filter: brightness(1.08); }
.btn-collect:disabled { opacity: .6; cursor: default; }

/* ---- 卡片网格 ---- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 16px;
  padding: 22px 28px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  gap: 10px;
  transition: transform .15s, box-shadow .15s;
  border-top: 3px solid var(--cat, var(--brand));
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(20, 30, 60, .12); }

.card-top { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.badge {
  font-size: 11px; padding: 3px 9px; border-radius: 999px;
  background: #f1f3f8; color: var(--ink-soft); white-space: nowrap;
}
.badge.cat { background: var(--cat-soft, #eef0ff); color: var(--cat, var(--brand)); font-weight: 600; }
.badge.heat { margin-left: auto; background: #fff1ec; color: #ef5b2b; font-weight: 600; }

.card h2 { margin: 0; font-size: 16px; line-height: 1.45; }
.card h2 a { color: var(--ink); text-decoration: none; }
.card h2 a:hover { color: var(--brand); }
.summary { margin: 0; font-size: 13px; color: var(--ink-soft); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.opportunity {
  background: linear-gradient(0deg, #fffaf0, #fffdf8);
  border: 1px solid #f4e6c8;
  border-radius: 10px;
  padding: 10px 12px; font-size: 13px; line-height: 1.6; color: #6b4e1f;
}
.opportunity b { color: #b9772a; }

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 11px; padding: 2px 8px; border-radius: 6px; background: #f1f3f8; color: var(--ink-soft); }

.card-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 2px; }
.time { font-size: 12px; color: #9aa3b2; }
.src-link { font-size: 12px; color: var(--brand); text-decoration: none; }
.src-link:hover { text-decoration: underline; }

.empty { text-align: center; color: var(--ink-soft); padding: 60px 20px; font-size: 15px; }

.foot {
  padding: 18px 28px 30px; color: #9aa3b2; font-size: 12px;
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
}
.foot .dot { opacity: .5; }