:root{
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --primary-light:#eef2ff;
  --success:#16a34a;
  --danger:#dc2626;
  --warning:#d97706;
  --text:#1f2937;
  --text-light:#6b7280;
  --border:#e5e7eb;
  --bg:#f5f6fa;
  --card:#ffffff;
  --radius:14px;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}
a{color:var(--primary);text-decoration:none;}
a:hover{text-decoration:underline;}

.topbar{
  background:linear-gradient(135deg,#4f46e5,#7c3aed);
  color:#fff;
  padding:16px 24px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
}
.topbar h1{font-size:18px;margin:0;font-weight:600;}
.topbar .user-info{font-size:14px;opacity:.95;display:flex;align-items:center;gap:14px;}
.topbar a{color:#fff;opacity:.9;}
.topbar a:hover{opacity:1;}
.badge-role{
  background:rgba(255,255,255,.2);
  padding:2px 10px;
  border-radius:20px;
  font-size:12px;
}

.container{max-width:1000px;margin:24px auto;padding:0 16px;}
.container.narrow{max-width:480px;}

.card{
  background:var(--card);
  border-radius:var(--radius);
  padding:24px;
  margin-bottom:20px;
  box-shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
}
.card h2{margin-top:0;font-size:17px;color:var(--text);}
.card h3{font-size:15px;color:var(--text-light);margin-top:0;}

input[type=text],input[type=password],input[type=number],
input[type=datetime-local],textarea,select{
  width:100%;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:8px;
  font-size:14px;
  font-family:inherit;
  background:#fff;
  transition:border-color .15s;
}
input:focus,textarea:focus,select:focus{
  outline:none;
  border-color:var(--primary);
}
label{display:block;margin-bottom:14px;font-size:14px;color:var(--text);}
label .field-hint{color:var(--text-light);font-weight:normal;font-size:12px;}

.btn{
  display:inline-block;
  padding:10px 20px;
  border-radius:8px;
  border:none;
  background:var(--primary);
  color:#fff;
  font-size:14px;
  font-weight:500;
  cursor:pointer;
  transition:background .15s,transform .1s;
}
.btn:hover{background:var(--primary-dark);}
.btn:active{transform:scale(.98);}
.btn.btn-secondary{background:#f3f4f6;color:var(--text);}
.btn.btn-secondary:hover{background:#e5e7eb;}
.btn.btn-danger{background:var(--danger);}
.btn.btn-danger:hover{background:#b91c1c;}
.btn.btn-success{background:var(--success);}
.btn.btn-block{width:100%;}
.btn.btn-sm{padding:6px 12px;font-size:13px;}
.btn:disabled{background:#d1d5db;cursor:not-allowed;}

table{width:100%;border-collapse:collapse;font-size:14px;}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);}
th{color:var(--text-light);font-weight:600;font-size:13px;background:#fafafa;}
tr:hover td{background:#fafbff;}

.tag{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:500;}
.tag.green{background:#dcfce7;color:#15803d;}
.tag.red{background:#fee2e2;color:#b91c1c;}
.tag.gray{background:#f3f4f6;color:#6b7280;}
.tag.purple{background:#ede9fe;color:#6d28d9;}
.tag.orange{background:#ffedd5;color:#c2410c;}

.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px;}
.alert.success{background:#dcfce7;color:#15803d;}
.alert.error{background:#fee2e2;color:#b91c1c;}
.alert.info{background:#eef2ff;color:#4338ca;}
.alert.warning{background:#fef3c7;color:#92400e;}

.stat-row{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:20px;}
.stat-box{
  flex:1;min-width:140px;
  background:linear-gradient(135deg,#4f46e5,#6366f1);
  color:#fff;border-radius:var(--radius);padding:18px;
}
.stat-box .num{font-size:28px;font-weight:700;}
.stat-box .label{font-size:13px;opacity:.9;}
.stat-box.gray{background:linear-gradient(135deg,#6b7280,#9ca3af);}
.stat-box.orange{background:linear-gradient(135deg,#f59e0b,#f97316);}

.dropzone{
  border:2px dashed #c7d2fe;
  border-radius:var(--radius);
  padding:36px 20px;
  text-align:center;
  color:var(--text-light);
  background:var(--primary-light);
  cursor:pointer;
  transition:all .15s;
}
.dropzone.dragover{
  border-color:var(--primary);
  background:#e0e7ff;
}
.dropzone .icon{font-size:36px;margin-bottom:8px;}

.file-list{margin-top:14px;}
.file-item{
  display:flex;justify-content:space-between;align-items:center;
  padding:10px 14px;background:#f9fafb;border-radius:8px;margin-bottom:8px;font-size:13px;
}
.file-item .remove{color:var(--danger);cursor:pointer;font-weight:bold;}

.progress-wrap{margin-top:16px;display:none;}
.progress-bar-bg{background:#e5e7eb;border-radius:20px;height:18px;overflow:hidden;}
.progress-bar-fill{
  background:linear-gradient(90deg,#4f46e5,#7c3aed);
  height:100%;width:0%;
  transition:width .2s;
  border-radius:20px;
}
.progress-text{text-align:center;font-size:13px;margin-top:6px;color:var(--text-light);}

.countdown-box{
  background:linear-gradient(135deg,#111827,#374151);
  color:#fff;border-radius:var(--radius);padding:16px;text-align:center;margin-bottom:16px;
}
.countdown-box .time{font-size:22px;font-weight:700;letter-spacing:1px;}
.countdown-box.expired{background:linear-gradient(135deg,#7f1d1d,#991b1b);}

.captcha-row{display:flex;gap:10px;align-items:center;}
.captcha-question{
  background:var(--primary-light);
  padding:10px 16px;border-radius:8px;font-weight:600;color:var(--primary-dark);
  white-space:nowrap;user-select:none;
}

.empty-state{text-align:center;color:var(--text-light);padding:30px 0;}
.back-link{display:inline-block;margin-bottom:16px;font-size:14px;}
.small-note{font-size:12px;color:var(--text-light);margin-top:6px;}

.tabs-nav{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:20px;flex-wrap:wrap;}
.tabs-nav button{
  background:none;border:none;padding:10px 16px;font-size:14px;color:var(--text-light);
  cursor:pointer;border-bottom:2px solid transparent;font-family:inherit;font-weight:500;
}
.tabs-nav button:hover{color:var(--primary);}
.tabs-nav button.active{color:var(--primary);border-bottom-color:var(--primary);}
.tab-panel{display:none;}
.tab-panel.active{display:block;}

@media (max-width:600px){
  .container{margin:12px auto;}
  .card{padding:16px;border-radius:10px;}
  table,th,td{font-size:13px;}
}