:root{
  --bg:#F1F5F9;
  --surface:#FFFFFF;
  --border:#E2E8F0;
  --text:#1E293B;
  --text-secondary:#64748B;
  --accent:#2563EB;
  --accent-dark:#1E40AF;
  --success-bg:#DCFCE7; --success-text:#15803D;
  --warning-bg:#FEF3C7; --warning-text:#B45309;
  --info-bg:#DBEAFE; --info-text:#1D4ED8;
  --muted-bg:#E5E7EB; --muted-text:#374151;
  --danger:#DC2626;
  --radius:10px;
}
*{box-sizing:border-box;}
html, body{
  overflow-x:hidden;
  max-width:100vw;
}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
}
.header{
  background:#0F172A;
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 24px;
}
.logo{font-weight:700; font-size:18px; letter-spacing:.3px;}
.header-right{display:flex; align-items:center; gap:14px; font-size:14px;}
.btn-ghost{
  background:transparent; border:1px solid rgba(255,255,255,.35); color:#fff;
  padding:6px 14px; border-radius:var(--radius); cursor:pointer; font-size:13px;
}
.btn-ghost:hover{background:rgba(255,255,255,.1);}
.nav{
  background:var(--surface); border-bottom:1px solid var(--border);
  display:flex; gap:4px; padding:0 24px; overflow-x:auto;
}
.tab-btn{
  background:transparent; border:none; padding:14px 16px; font-size:14px;
  color:var(--text-secondary); cursor:pointer; border-bottom:3px solid transparent; white-space:nowrap;
}
.tab-btn.active{color:var(--accent); border-bottom-color:var(--accent); font-weight:600;}
.container{max-width:1080px; margin:0 auto; padding:24px 20px 60px;}
.card{
  background:var(--surface); border:1px solid var(--border); border-radius:12px;
  padding:20px 22px; margin-bottom:16px;
}
h2{font-size:19px; margin:0 0 16px;}
h3{font-size:15px; margin:0 0 4px;}
label{display:block; font-size:13px; font-weight:600; margin:14px 0 6px; color:var(--text);}
label .req{color:var(--danger); font-weight:400;}
input[type=text], input[type=password], select, textarea, input[type=file]{
  width:100%; padding:9px 11px; border:1px solid var(--border); border-radius:8px;
  font-size:14px; font-family:inherit; background:#fff; color:var(--text);
}
textarea{resize:vertical; min-height:70px;}
input:focus, select:focus, textarea:focus{outline:2px solid var(--accent); outline-offset:1px;}
.btn{
  background:var(--accent); color:#fff; border:none; padding:10px 18px;
  border-radius:8px; font-size:14px; font-weight:600; cursor:pointer;
}
.btn:hover{background:var(--accent-dark);}
.btn-secondary{
  background:#fff; color:var(--text); border:1px solid var(--border);
  padding:9px 16px; border-radius:8px; font-size:13px; cursor:pointer;
}
.btn-secondary:hover{background:#F8FAFC;}
.error-text{color:var(--danger); font-size:13px; margin-top:6px; min-height:16px;}
.badge{display:inline-block; padding:3px 10px; border-radius:999px; font-size:12px; font-weight:600;}
.badge-open{background:var(--info-bg); color:var(--info-text);}
.badge-pending{background:var(--warning-bg); color:var(--warning-text);}
.badge-solved{background:var(--success-bg); color:var(--success-text);}
.badge-closed{background:var(--muted-bg); color:var(--muted-text);}
.role-badge{background:var(--info-bg); color:var(--info-text); padding:2px 9px; border-radius:6px; font-size:11px; font-weight:700;}
table{width:100%; border-collapse:collapse; font-size:13.5px;}
.table-wrap{overflow-x:auto; -webkit-overflow-scrolling:touch; margin:0 -4px;}
.table-wrap table{min-width:640px;}
th, td{text-align:left; padding:10px 8px; border-bottom:1px solid var(--border); vertical-align:top;}
th{color:var(--text-secondary); font-weight:600; font-size:12.5px; text-transform:uppercase; letter-spacing:.3px;}
tr:hover td{background:#FAFBFC;}
.filters{display:flex; flex-wrap:wrap; gap:10px; margin-bottom:16px;}
.filters > div{flex:1; min-width:150px;}
.stat-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; margin-bottom:20px;}
.stat-card{background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:16px 18px;}
.stat-label{font-size:12.5px; color:var(--text-secondary); margin-bottom:4px;}
.stat-value{font-size:26px; font-weight:700;}
.ticket-card{border:1px solid var(--border); border-radius:10px; padding:14px 16px; margin-bottom:12px;}
.ticket-card-top{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:8px;}
.ticket-num{font-weight:700; color:var(--accent);}
.meta-line{color:var(--text-secondary); font-size:13px; margin-top:4px;}
.stars{font-size:22px; letter-spacing:3px; cursor:pointer; user-select:none;}
.star{color:#D1D5DB;}
.star.filled{color:#F59E0B;}
.stars.readonly .star{cursor:default;}
.login-wrap{min-height:100vh; display:flex; align-items:center; justify-content:center; padding:20px;}
.login-card{background:var(--surface); border:1px solid var(--border); border-radius:14px; padding:34px 30px; width:100%; max-width:380px;}
.login-title{font-size:20px; font-weight:700; margin-bottom:4px; text-align:center;}
.login-sub{font-size:13px; color:var(--text-secondary); text-align:center; margin-bottom:20px;}
.hint-box{background:#F8FAFC; border:1px dashed var(--border); border-radius:8px; padding:10px 12px; font-size:12.5px; color:var(--text-secondary); margin-top:18px; line-height:1.6;}
#modal-overlay{position:fixed; inset:0; background:rgba(15,23,42,.55); z-index:1000; display:none; align-items:center; justify-content:center; padding:20px;}
#modal-content{background:#fff; border-radius:14px; max-width:560px; width:100%; max-height:88vh; overflow-y:auto; padding:24px 26px;}
.modal-close{float:right; background:none; border:none; font-size:20px; cursor:pointer; color:var(--text-secondary);}
#toast-container{position:fixed; top:16px; right:16px; z-index:1200; display:flex; flex-direction:column; gap:8px;}
.toast{background:#0F172A; color:#fff; padding:12px 16px; border-radius:8px; font-size:13px; max-width:320px; box-shadow:0 4px 14px rgba(0,0,0,.2);}
.file-preview img{max-width:220px; border-radius:8px; border:1px solid var(--border); margin-top:8px;}
.empty-state{text-align:center; padding:40px 10px; color:var(--text-secondary);}
.divider{border:none; border-top:1px solid var(--border); margin:18px 0;}
.row2{display:grid; grid-template-columns:1fr 1fr; gap:16px;}
@media (max-width:600px){ .row2{grid-template-columns:1fr;} }

@media (max-width:640px){
  .header{padding:12px 14px; flex-wrap:wrap; gap:8px;}
  .logo{font-size:16px;}
  .header-right{font-size:12.5px; gap:8px; flex-wrap:wrap;}
  .nav{padding:0 10px;}
  .tab-btn{padding:12px 10px; font-size:13px;}
  .container{padding:16px 12px 50px;}
  .card{padding:16px 14px;}
  h2{font-size:17px;}
  .filters{gap:8px;}
  .filters > div{min-width:100%;}
  .ticket-card-top{flex-direction:column; align-items:flex-start;}
  .stat-grid{grid-template-columns:repeat(2,1fr);}
  #modal-content{padding:18px 16px; max-height:92vh;}
  .stars{font-size:26px;}
}