:root{
  --bg:#fafbfc; --card:#ffffff; --card2:#f8f9fa; --line:#e1e4e8;
  --fg:#24292e; --dim:#6a737d; --accent:#0366d6;
  --oa:#28a745; --tz:#f9a825; --new:#ff9800; --star:#e36209;
  --shadow:0 1px 3px rgba(0,0,0,0.08);
  --shadow-hover:0 4px 12px rgba(0,0,0,0.12);
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--fg);
  font-family:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,0.95);backdrop-filter:blur(8px);
  padding:16px 20px 12px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.head-top{display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:900px;margin:0 auto}
h1{font-size:1.25rem;margin:0;font-weight:600;letter-spacing:-0.02em;color:var(--fg)}
.meta{font-size:.75rem;color:var(--dim);white-space:nowrap}
.hidden{display:none!important}
.head-right{display:flex;align-items:center;gap:10px;flex:none}
.head-toggle{flex:none;padding:4px 12px;border-radius:8px;border:1px solid var(--line);
  background:var(--card);color:var(--dim);font-size:.9rem;line-height:1.4;cursor:pointer;
  user-select:none;transition:all .2s}
.head-toggle:hover{border-color:var(--accent);color:var(--accent)}
.head-toggle.on{background:#f1f8ff;color:var(--accent);border-color:var(--accent)}
.head-extra{margin-top:12px;max-width:900px;margin-left:auto;margin-right:auto}

/* 等待同步 banner */
.sync-banner{margin:10px auto 6px;padding:10px 14px;border-radius:8px;cursor:pointer;
  background:#fff8e1;color:#f57c00;font-size:.85rem;border:1px solid #ffe0b2;
  max-width:900px;user-select:none;transition:all .2s}
.sync-banner:hover{background:#fff3cd;border-color:#ffc107}

.visit-banner{margin:10px auto 6px;padding:10px 14px;border-radius:8px;cursor:pointer;
  background:#e3f2fd;color:#1976d2;font-size:.85rem;border:1px solid #bbdefb;
  max-width:900px;user-select:none;transition:all .2s}
.visit-banner:hover{background:#bbdefb;border-color:#2196f3}

/* 上传外部论文 */
.upload{margin:10px auto 6px;border:1px solid var(--line);border-radius:10px;
  background:var(--card);font-size:.85rem;max-width:900px;transition:all .2s}
.upload:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.upload summary{padding:10px 14px;cursor:pointer;color:var(--accent);user-select:none;font-weight:500}
.upload-body{padding:0 14px 14px;display:flex;flex-direction:column;gap:8px}
.upload-body input[type=text],.upload-body input[type=file]{padding:8px 10px;border-radius:6px;
  border:1px solid var(--line);background:var(--bg);color:var(--fg);font-size:.85rem;transition:all .2s}
.upload-body input[type=text]:focus,.upload-body input[type=file]:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(3,102,214,0.1)}
.up-check{display:flex;align-items:center;gap:6px;color:var(--dim);font-size:.8rem}
.up-modes{display:flex;gap:16px;flex-wrap:wrap}
#upBtn{padding:8px 16px;border-radius:6px;border:1px solid var(--accent);background:var(--accent);
  color:white;cursor:pointer;font-size:.85rem;font-weight:500;transition:all .2s}
#upBtn:hover{background:#0256b9;transform:translateY(-1px);box-shadow:var(--shadow)}
.up-msg{font-size:.78rem;color:var(--dim);min-height:1em}

/* 主题开关 */
.topics{display:flex;flex-wrap:wrap;gap:8px;margin:10px auto 8px;max-width:900px}
.topic{padding:6px 14px;border-radius:20px;border:1px solid var(--line);
  background:var(--card);color:var(--dim);font-size:.8rem;cursor:pointer;user-select:none;
  transition:all .2s;font-weight:500}
.topic:hover{border-color:var(--accent);color:var(--accent)}
.topic.on{background:var(--accent);color:white;border-color:var(--accent)}

/* 筛选 */
#search{width:100%;margin-top:8px;padding:10px 14px;border-radius:8px;border:1px solid var(--line);
  background:var(--card);color:var(--fg);font-size:.9rem;transition:all .2s}
#search:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(3,102,214,0.1)}
.filter-row{display:flex;gap:10px;align-items:center;margin-top:8px;flex-wrap:wrap}
#sort{padding:8px 12px;border-radius:6px;border:1px solid var(--line);background:var(--card);
  color:var(--fg);font-size:.8rem;cursor:pointer;transition:all .2s}
#sort:hover{border-color:var(--accent)}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{padding:6px 12px;border-radius:16px;border:1px solid var(--line);
  background:var(--card);color:var(--dim);font-size:.78rem;cursor:pointer;transition:all .2s;font-weight:500}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip[data-on="1"]{background:var(--accent);color:white;border-color:var(--accent)}
.seen-toggle{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;
  color:var(--dim);cursor:pointer;user-select:none;white-space:nowrap}
.seen-toggle input{cursor:pointer;margin:0}

/* 卡片 */
main{padding:16px 20px 60px;max-width:900px;margin:0 auto}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:16px 18px;margin-bottom:14px;box-shadow:var(--shadow);transition:all .25s}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px);border-color:#d1d5db}
.card.starred{border-color:var(--star);border-width:2px}
.card.down{opacity:.5}
.card.seen{opacity:.6}
.card.seen.starred,.card.seen:hover{opacity:1}
.c-head{display:flex;gap:12px;align-items:flex-start}
.score{flex:none;min-width:36px;height:36px;border-radius:8px;display:flex;align-items:center;
  justify-content:center;font-weight:700;font-size:.9rem;background:#f6f8fa;color:var(--dim);
  box-shadow:inset 0 0 0 1px var(--line)}
.score.hi{background:#dcffe4;color:#22863a;box-shadow:inset 0 0 0 1px #34d058}
.score.mid{background:#fff5b1;color:#b08800;box-shadow:inset 0 0 0 1px #ffd33d}
.c-title{font-weight:600;font-size:1rem;cursor:pointer;line-height:1.4;color:var(--fg);transition:color .2s}
.c-title:hover{color:var(--accent)}
.c-src{font-size:.75rem;color:var(--dim);margin-top:4px;line-height:1.4}
.badges{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.badge{font-size:.72rem;padding:4px 10px;border-radius:12px;text-decoration:none;
  display:inline-flex;align-items:center;line-height:1.3;box-sizing:border-box;
  border:1px solid transparent;font-weight:500;transition:all .2s}
.badge:hover{transform:translateY(-1px)}
.b-oa{background:#dcffe4;color:#22863a;border-color:#34d058}
.b-oanew{background:#c8e6c9;color:#1b5e20;border-color:#4caf50;font-weight:600}
.b-tz{background:#fff8e1;color:#f57f17;border-color:#ffc107}
.b-new{background:#fff3e0;color:#e65100;border-color:#ff9800}
.b-tag{background:#f6f8fa;color:#586069;border-color:#e1e4e8}
.abs{font-size:.85rem;color:var(--dim);margin-top:10px;display:none;line-height:1.6}
.abs.show{display:block}

/* 动作按钮 */
.acts{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.act{flex:none;padding:6px 12px;border-radius:6px;border:1px solid var(--line);
  background:var(--card);color:var(--fg);font-size:.75rem;line-height:1.3;
  display:inline-flex;align-items:center;box-sizing:border-box;cursor:pointer;
  transition:all .2s;font-weight:500}
.act:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.act.on{background:var(--accent);border-color:var(--accent);color:white}
.act:active{transform:scale(.95)}
.act.vote.on{background:var(--accent);border-color:var(--accent);color:white;font-weight:600}
.act.seen.on{background:#f6f8fa;border-color:#959da5;color:#586069}
.act.deepread.on{background:#0366d6;border-color:#0366d6;color:white}
.act.content.on{background:#6f42c1;border-color:#6f42c1;color:white}

footer{text-align:center;color:var(--dim);font-size:.75rem;padding:24px 20px;border-top:1px solid var(--line);margin-top:40px}

/* ===== PRPM v2 ===== */
.b-explore{background:#f3e5f5;color:#7b1fa2;border-color:#ce93d8}

.score.clickable{cursor:pointer}
.score.clickable:hover{transform:scale(1.05)}
.why{margin-top:10px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;
  background:var(--bg);font-size:.78rem;color:var(--dim)}
.why-row{display:flex;justify-content:space-between;gap:12px;padding:3px 0}
.why-l{flex:1;min-width:0}
.why-n{flex:none;font-variant-numeric:tabular-nums;font-family:"SF Mono",Consolas,monospace;font-size:.75rem;font-weight:600}
.why-n.pos{color:#28a745}
.why-n.neg{color:#d73a49}
.why-dim{opacity:.7;border-top:1px solid var(--line);margin-top:6px;padding-top:6px}

/* 偏好仪表板 */
.dim{color:var(--dim)}
.rev-link{text-decoration:none}
.rev-done{text-align:center;color:var(--fg);font-size:1.1rem;padding:60px 20px;line-height:2}
.rev-done .dim{color:var(--dim);font-size:.9rem}
.rev-note{font-size:.8rem;color:var(--dim);margin-top:10px}
.stat-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.stat-tiles.st5{grid-template-columns:repeat(5,1fr)}
.stat-tiles.st3{grid-template-columns:repeat(3,1fr)}
.stat-tile{text-align:center;padding:16px 8px;background:var(--card);border-radius:10px;border:1px solid var(--line)}
.stat-n{font-size:1.5rem;font-weight:700;color:var(--accent)}
.stat-l{font-size:.75rem;color:var(--dim);margin-top:4px}
.hbar-row{display:flex;gap:10px;align-items:center;margin-top:10px;font-size:.85rem}
.hbar-l{flex:none;width:120px;color:var(--dim)}
.hbar{height:14px;background:#c8e6c9;border-radius:7px;min-width:2px;transition:width .3s}
.hbar-n{color:var(--dim);font-size:.8rem}
.hbar-n b{color:#f57f17}
.move{flex:none;font-size:.85rem;font-variant-numeric:tabular-nums;font-weight:600}
.move.pos{color:#28a745}
.move.neg{color:#d73a49}

/* 响应式设计 */
@media (max-width: 768px) {
  header{padding:12px 16px 10px}
  h1{font-size:1.1rem}
  main{padding:12px 16px 40px}
  .card{padding:14px 16px}
  .topics{gap:6px}
  .topic{padding:5px 12px;font-size:.75rem}
  .acts{gap:5px}
  .act{padding:5px 10px;font-size:.7rem}
  .stat-tiles{grid-template-columns:repeat(2,1fr)}
}