/* ============================================================
   课题组学术过程管理系统 — 设计系统 v1.2
   design tokens + 浅/深/系统三态 + 质感升级
   ============================================================ */
:root{
  /* 浅色主题（默认） */
  --primary:#3b6fd4; --primary-d:#2f59b0; --accent:#7b5cd6;
  --bg:#f4f6fb; --bg-grad:linear-gradient(135deg,#eef2fb 0%,#f7f9fd 100%);
  --surface:#ffffff; --surface-2:#f7f9fc; --glass:rgba(255,255,255,.7);
  --text:#1c2433; --muted:#6b7689; --border:#e6eaf2; --border-strong:#d4dbe8;
  --ok:#1f9d6b; --warn:#d99431; --bad:#e0524d; --ai:#7b5cd6;
  --shadow:0 6px 24px rgba(24,39,75,.08); --shadow-lg:0 18px 50px rgba(24,39,75,.16);
  --radius:16px; --radius-sm:10px; --ring:0 0 0 3px rgba(59,111,212,.16);
  --sidebar-grad:linear-gradient(180deg,#1d2a4a 0%,#243a63 100%);
}
:root[data-theme="dark"]{
  --primary:#6f9bf0; --primary-d:#5681e0; --accent:#a98bf0;
  --bg:#0e1117; --bg-grad:linear-gradient(135deg,#0e1117 0%,#141b26 100%);
  --surface:#171c26; --surface-2:#1d2430; --glass:rgba(30,38,52,.6);
  --text:#e7ecf3; --muted:#97a1b3; --border:#2a313f; --border-strong:#363f50;
  --ok:#34c98a; --warn:#e9b454; --bad:#f0716b; --ai:#a98bf0;
  --shadow:0 8px 30px rgba(0,0,0,.45); --shadow-lg:0 20px 60px rgba(0,0,0,.55);
  --ring:0 0 0 3px rgba(111,155,240,.22);
  --sidebar-grad:linear-gradient(180deg,#0c1019 0%,#141d2e 100%);
}
@media (prefers-color-scheme: dark){
  :root[data-theme="system"]{
    --primary:#6f9bf0; --primary-d:#5681e0; --accent:#a98bf0;
    --bg:#0e1117; --bg-grad:linear-gradient(135deg,#0e1117 0%,#141b26 100%);
    --surface:#171c26; --surface-2:#1d2430; --glass:rgba(30,38,52,.6);
    --text:#e7ecf3; --muted:#97a1b3; --border:#2a313f; --border-strong:#363f50;
    --ok:#34c98a; --warn:#e9b454; --bad:#f0716b; --ai:#a98bf0;
    --shadow:0 8px 30px rgba(0,0,0,.45); --shadow-lg:0 20px 60px rgba(0,0,0,.55);
    --ring:0 0 0 3px rgba(111,155,240,.22);
    --sidebar-grad:linear-gradient(180deg,#0c1019 0%,#141d2e 100%);
  }
}

*{box-sizing:border-box}
html{transition:background-color .3s ease,color .3s ease}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;
  transition:background-color .3s ease,color .3s ease}
button{font-family:inherit;cursor:pointer;font-size:14px;border:none;border-radius:var(--radius-sm);
  padding:9px 16px;background:var(--primary);color:#fff;font-weight:500;
  transition:background .18s,transform .18s,box-shadow .18s}
button:hover{background:var(--primary-d);transform:translateY(-1px);box-shadow:0 4px 14px rgba(24,39,75,.18)}
button:active{transform:translateY(0)}
button.ghost{background:var(--surface-2);color:var(--text)}
button.ghost:hover{background:var(--border)}
button:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.icon-btn{background:transparent;color:var(--text);font-size:18px;padding:7px 10px;box-shadow:none;position:relative}
.icon-btn:hover{background:rgba(127,127,127,.14);transform:translateY(0)}
input,select,textarea{font-family:inherit;font-size:14px;padding:9px 12px;border:1px solid var(--border);
  border-radius:var(--radius-sm);width:100%;background:var(--surface);color:var(--text);transition:.15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:var(--ring)}
textarea{resize:vertical;min-height:64px}
.flex1{flex:1;min-width:140px}.flex2{flex:2;min-width:180px}

/* 登录 */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(1200px 600px at 50% -10%,rgba(59,111,212,.18),transparent),var(--bg-grad)}
.login-card{width:380px;max-width:94vw;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:36px 32px;box-shadow:var(--shadow-lg);animation:pop .4s ease}
.login-card .brand{font-size:20px;font-weight:700;text-align:center;color:var(--primary)}
.login-card .sub{text-align:center;color:var(--muted);margin:6px 0 22px;font-size:13px}
.login-card label{display:block;font-size:13px;color:var(--muted);margin:14px 0 6px}
.login-card input{margin:0}
.login-card button{width:100%;margin-top:22px;padding:11px}
.login-card .err{color:var(--bad);font-size:13px;min-height:18px;margin-top:10px;text-align:center}
.login-card .hint{margin-top:18px;font-size:12px;color:var(--muted);background:var(--surface-2);
  border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px;line-height:1.7}

/* 登录滑块 */
.slider{position:relative;height:42px;margin-top:16px;background:var(--surface-2);border:1px solid var(--border);
  border-radius:21px;overflow:hidden;user-select:none;touch-action:none}
.slider-bg{position:absolute;left:0;top:0;height:100%;width:0;background:rgba(59,111,212,.18);border-radius:21px 0 0 21px;transition:width .05s linear}
.slider-text{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-size:13px;color:var(--muted);pointer-events:none}
.slider-knob{position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-d));color:#fff;font-size:18px;
  display:flex;align-items:center;justify-content:center;cursor:grab;box-shadow:0 3px 8px rgba(0,0,0,.2);transition:left .05s linear}
.slider-knob:active{cursor:grabbing}
.slider.ok .slider-knob{background:linear-gradient(135deg,#27ae60,#1e8449)}
.slider.ok .slider-text{color:#1e8449;font-weight:600}
.slider.ok .slider-bg{background:rgba(39,174,96,.18)}

/* 布局 */
.app{display:flex;min-height:100vh}
.sidebar{width:232px;background:var(--sidebar-grad);color:#fff;display:flex;flex-direction:column;flex-shrink:0;
  transition:background .3s ease}
.sidebar .logo{padding:20px 18px;font-weight:700;font-size:16px;border-bottom:1px solid rgba(255,255,255,.1)}
.sidebar nav{flex:1;padding:12px 10px;display:flex;flex-direction:column;gap:4px}
.sidebar nav button{background:transparent;color:#cdd7e6;text-align:left;padding:11px 14px;border-radius:var(--radius-sm)}
.sidebar nav button:hover{background:rgba(255,255,255,.1);color:#fff;transform:none}
.sidebar nav button.active{background:var(--primary);color:#fff;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.sidebar .side-foot{padding:14px 16px;border-top:1px solid rgba(255,255,255,.1);font-size:13px}
.sidebar .side-foot button{width:100%;background:rgba(255,255,255,.12);margin-top:8px}
.sidebar .side-foot button:hover{background:rgba(255,255,255,.22)}

.content{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{padding:14px 24px;background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:30}
.topbar h2{margin:0;font-size:19px;letter-spacing:.3px}
.top-meta{font-size:13px;color:var(--muted)}
.page{padding:24px;overflow:auto;flex:1;animation:fade .35s ease}

/* 卡片 */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin-bottom:16px;
  box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s,border-color .3s,background .3s}
.card:hover{box-shadow:var(--shadow-lg)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:12px}
.section-title{font-size:15px;font-weight:600;margin:8px 0 12px}

/* 统计 */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-bottom:18px}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s,background .3s;border-top:3px solid var(--primary)}
.stat:nth-child(2n){border-top-color:var(--accent)}
.stat:nth-child(3n){border-top-color:var(--ok)}
.stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.stat .num{font-size:26px;font-weight:700;color:var(--primary);font-variant-numeric:tabular-nums}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:4px}

/* 表格 */
table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:14px;vertical-align:middle}
th{background:var(--surface-2);color:var(--muted);font-weight:600;font-size:13px}
tbody tr{transition:background .15s}
tbody tr:hover{background:var(--surface-2)}
tbody tr:last-child td{border-bottom:none}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}
.badge.ok{background:rgba(31,157,107,.12);color:var(--ok);border-color:transparent}
.badge.warn{background:rgba(217,148,49,.14);color:var(--warn);border-color:transparent}
.badge.bad{background:rgba(224,82,77,.12);color:var(--bad);border-color:transparent}
.badge.ai{background:rgba(123,92,214,.12);color:var(--ai);border-color:transparent}
.empty{text-align:center;color:var(--muted);padding:40px 0}
.empty-state{text-align:center;color:var(--muted);padding:48px 16px}
.empty-state .ico{font-size:40px;opacity:.5;margin-bottom:8px}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(15,20,30,.5);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px;animation:fade .2s ease}
.modal-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);width:min(760px,96vw);max-height:88vh;overflow:auto;
  box-shadow:var(--shadow-lg);animation:pop .25s ease}
.modal-head{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border);
  font-weight:600;position:sticky;top:0;background:var(--surface);z-index:2}
.modal-body{padding:20px}
.modal-body label{display:block;font-size:13px;color:var(--muted);margin:12px 0 5px}
.modal-body label:first-child{margin-top:0}
.modal-foot{display:flex;gap:10px;justify-content:flex-end;margin-top:18px;padding-top:14px;border-top:1px solid var(--border)}
.modal-foot button{margin:0}

.field{margin-bottom:12px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:5px}
.note-card{border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;margin-bottom:10px;background:var(--surface-2)}
.note-card .meta{font-size:12px;color:var(--muted);margin-bottom:6px}
.chk{display:flex;flex-wrap:wrap;gap:14px;margin:8px 0}
.chk label{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text);font-weight:400;width:auto}
.chk input{width:auto}

/* toast */
.toast{position:fixed;left:50%;bottom:32px;transform:translateX(-50%) translateY(20px);
  background:var(--text);color:var(--surface);padding:11px 20px;border-radius:var(--radius-sm);opacity:0;
  transition:.25s;pointer-events:none;z-index:99;font-size:14px;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.ok{background:var(--ok)} .toast.bad{background:var(--bad)}

/* 顶栏右侧 + 通知 */
.top-right{display:flex;align-items:center;gap:8px}
.bell{position:relative;background:transparent;color:var(--text);font-size:18px;padding:6px 8px;box-shadow:none}
.bell:hover{background:rgba(127,127,127,.14);transform:none}
.bell-count{position:absolute;top:-2px;right:-2px;background:var(--bad);color:#fff;font-size:11px;border-radius:999px;padding:0 5px;min-width:16px;text-align:center}
.notif-panel{position:absolute;right:24px;top:64px;width:320px;max-height:60vh;overflow:auto;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:40;animation:pop .2s ease}
.notif-head{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-bottom:1px solid var(--border);font-weight:600}
.notif-head a{font-size:13px}
.notif-list{padding:8px}
.notif-item{padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;margin-bottom:4px;transition:background .15s}
.notif-item:hover{background:var(--surface-2)}
.notif-item.unread{background:rgba(59,111,212,.08)}
.notif-item .meta{font-size:12px;color:var(--muted);margin-top:3px}

/* 图表 / 月历 / 分页 */
.chart-row{display:flex;flex-wrap:wrap;gap:16px}
.chart-box{flex:1;min-width:300px;height:240px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px}
.weekly{white-space:pre-wrap;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;margin-top:12px;font-family:inherit;font-size:13px;line-height:1.7}
.calendar{margin-top:8px}
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px}
.cal-head div{text-align:center;font-size:12px;color:var(--muted);padding:4px 0;font-weight:600}
.cal-cell{border:1px solid var(--border);border-radius:var(--radius-sm);min-height:54px;padding:4px;font-size:13px}
.cal-cell.empty{background:var(--surface-2);border:none}
.cal-cell.has-ev{background:rgba(59,111,212,.08);border-color:rgba(59,111,212,.3)}
.cal-ev{font-size:11px;color:var(--primary);margin-top:2px;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pager{margin-top:12px;display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted)}
.pager button{margin:0;padding:5px 12px}

/* PDF 预览 + 标注 + 阅读计时 */
.pdf-wrap{margin:6px 0 14px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#525659}
.pdf-bar{display:flex;align-items:center;gap:12px;padding:8px 12px;background:#3b3f44;color:#fff}
.pdf-bar button{padding:5px 12px;margin:0;font-size:13px}
.pdf-host{position:relative;overflow:auto;max-height:60vh;padding:14px;display:flex;justify-content:center}
.pdf-host.annot-on{cursor:crosshair}
#pdfCanvas{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.3);border-radius:2px}
.annot-layer{position:absolute;left:14px;right:14px;top:14px;bottom:14px;pointer-events:none}
.annot-dot{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--ai);border:2px solid #fff;transform:translate(-50%,-50%);box-shadow:0 1px 4px rgba(0,0,0,.4)}
.annot-hint{color:#fff;font-size:12px;padding:4px 14px 10px;background:#3b3f44}
.read-timer .timer{font-size:15px}
.read-timer .timer b{font-size:20px;color:var(--primary);font-variant-numeric:tabular-nums}
.timer{flex:1}

/* 审计 / 批注 */
.audit-row{padding:8px 0;border-bottom:1px dashed var(--border);font-size:13px}
.audit-row .meta{font-size:12px;color:var(--muted);margin-left:8px}
.comment{margin-top:6px;background:rgba(123,92,214,.1);color:var(--ai);border-radius:var(--radius-sm);padding:6px 10px;font-size:13px}

/* ============ v1.2 新增 ============ */
/* 移动端底部 Tab */
.mobile-tab{display:none}
@media(max-width:760px){
  .app{flex-direction:column}
  .sidebar{display:none}
  .mobile-tab{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:60;
    background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    border-top:1px solid var(--border);padding:6px 4px;gap:2px;justify-content:space-around}
  .mobile-tab button{flex:1;background:transparent;color:var(--muted);font-size:11px;flex-direction:column;gap:2px;
    display:flex;align-items:center;padding:6px 2px;border-radius:12px}
  .mobile-tab button .ico{font-size:20px}
  .mobile-tab button.active{color:var(--primary);background:rgba(59,111,212,.1)}
  .mobile-tab button:hover{transform:none;background:rgba(59,111,212,.06)}
  .page{padding:16px 14px 80px}
  .topbar{padding:12px 16px}
  .cal-cell{min-height:44px}
}
/* 全局搜索 */
.search-res{padding:6px 0}
.search-group{margin-top:10px}
.search-group .g-title{font-size:13px;color:var(--muted);font-weight:600;margin:6px 0;display:flex;align-items:center;gap:6px}
.search-item{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:6px;cursor:pointer;transition:background .15s,border-color .15s}
.search-item:hover{background:var(--surface-2);border-color:var(--primary)}
.search-item .t{font-weight:500}
.search-item .s{font-size:12px;color:var(--muted);margin-top:2px}
/* 批量工具条 */
.batch-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:10px 12px;margin-bottom:12px;
  background:rgba(59,111,212,.07);border:1px solid rgba(59,111,212,.25);border-radius:var(--radius-sm)}
.batch-bar .count{font-size:13px;color:var(--primary);font-weight:600;margin-right:4px}
.batch-bar select{width:auto;min-width:120px}
.batch-bar button{margin:0}
/* 时间线 */
.timeline{position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:9px;top:4px;bottom:4px;width:2px;background:var(--border)}
.tl-item{position:relative;padding:10px 0}
.tl-item::before{content:"";position:absolute;left:-22px;top:14px;width:14px;height:14px;border-radius:50%;
  background:var(--surface);border:3px solid var(--primary)}
.tl-item.tp-note::before{border-color:var(--accent)}
.tl-item.tp-comment::before{border-color:var(--ai)}
.tl-item.tp-material::before{border-color:var(--warn)}
.tl-item.tp-reading::before{border-color:var(--ok)}
.tl-body{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;cursor:pointer;transition:background .15s,border-color .15s}
.tl-body:hover{background:var(--surface-2);border-color:var(--primary)}
.tl-text{font-size:14px}
.tl-meta{font-size:12px;color:var(--muted);margin-top:3px}
.tl-ico{display:inline-block;margin-right:6px}
/* AI 分析 */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:6px}
.ai-user{border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;background:var(--surface-2)}
.ai-user .nm{font-weight:600;margin-bottom:4px}
.ai-bar{height:8px;border-radius:999px;background:var(--border);overflow:hidden;margin:6px 0}
.ai-bar > i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--primary))}
.ai-tools{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.ai-tools span{font-size:11px;padding:2px 8px;border-radius:999px;background:rgba(123,92,214,.12);color:var(--ai)}
/* 进度报告 */
.report-tbl{font-size:13px}
.report-summary{font-size:13px;color:var(--muted);margin-bottom:8px}

/* 动画 */
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
@keyframes fade{from{opacity:0}to{opacity:1}}
.anim-in{animation:pop .3s ease both}
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}