:root{
  --indigo:#1B3A5C;
  --indigo-light:#24506F;
  --indigo-dark:#122840;
  --sky:#00BCD4;
  --sky-light:#26C6DA;
  --sky-dark:#00838F;
  --gray:#B0BEC5;
  --gray-light:#CFD8DC;
  --gray-dark:#78909C;
  --primary:#1B3A5C;
  --secondary:#00BCD4;
  --accent:#00BCD4;
  --danger:#E53935;
  --success:#00897B;
  --bg:#ECEFF1;
  --card:#FFFFFF;
  --text:#1A2938;
  --muted:#546E7A;
  --border:#CFD8DC;
  --radius:8px;
  --space-1:8px;
  --space-2:12px;
  --space-3:16px;
  --space-4:20px;
  --space-5:24px;
}

*{box-sizing:border-box}
body{
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, "Noto Sans", "Microsoft JhengHei", sans-serif;
  color:var(--text);
  background:var(--bg);
  padding:20px;
  max-width:1200px;
  margin:0 auto;
}
h1{font-size:24px;font-weight:700;margin:0 0 var(--space-4);color:var(--indigo)}
h2{font-size:20px;font-weight:600;margin:0 0 var(--space-3);color:var(--indigo)}
h3{font-size:18px;font-weight:600;margin:0 0 var(--space-2);color:var(--indigo)}
p, label, td, th, a, span{font-size:14px}
small{font-size:12px;color:var(--muted)}

a{color:var(--sky-dark);text-decoration:none}
a:hover{color:var(--sky);text-decoration:underline}

.section{margin-bottom:var(--space-5);border:1px solid var(--border);padding:var(--space-4);border-radius:var(--radius);background:var(--card)}
.card{border:1px solid var(--border);padding:var(--space-4);border-radius:var(--radius);box-shadow:0 2px 8px rgba(27,58,92,0.06);background:var(--card)}

.btn{display:inline-block;padding:var(--space-1) var(--space-2);border:none;border-radius:var(--radius);color:#fff;background:var(--indigo);text-decoration:none;cursor:pointer;box-shadow:0 1px 3px rgba(27,58,92,0.12);font-weight:500;transition:all 0.2s}
.btn:hover{filter:brightness(1.1);box-shadow:0 2px 6px rgba(27,58,92,0.2);text-decoration:none;color:#fff}
.btn:active{filter:brightness(0.9)}
.btn-primary{background:var(--indigo)}
.btn-secondary{background:var(--sky)}
.btn-success{background:var(--success)}
.btn-warning{background:#FF8F00;color:#fff}
.btn-danger{background:var(--danger)}
.btn-toggle{background:var(--sky)}
.btn-cancel{background:var(--gray);color:var(--text)}

input[type="text"],input[type="number"],input[type="date"],input[type="password"],input[type="email"],select,textarea{
  width:100%;height:36px;border:1px solid var(--border);border-radius:var(--radius);padding:8px 10px;background:#fff;
}
textarea{min-height:100px}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--sky);box-shadow:0 0 0 3px rgba(0,188,212,0.15)
}

table{width:100%;border-collapse:collapse;margin-bottom:var(--space-4);background:var(--card);border-radius:var(--radius);overflow:hidden}
th,td{border:1px solid var(--border);padding:8px;text-align:left}
th{background:var(--indigo);color:#fff;font-weight:600}

.main-nav{
  background:linear-gradient(135deg, var(--indigo-dark), var(--indigo));
  overflow:hidden;
  margin-bottom:var(--space-4);
  padding:0 10px;
  border-radius:var(--radius);
  display:flex;
  align-items:center;
  box-shadow:0 2px 8px rgba(27,58,92,0.15);
}
.main-nav .nav-logo{
  display:flex;
  align-items:center;
  padding:8px 16px 8px 8px;
  flex-shrink:0;
}
.main-nav .nav-logo img{
  height:30px;
}
.main-nav a{
  float:left;
  display:block;
  color:rgba(255,255,255,0.85);
  text-align:center;
  padding:14px 16px;
  text-decoration:none;
  font-size:15px;
  font-weight:500;
  transition:all 0.2s;
}
.main-nav a:hover{
  background-color:rgba(0,188,212,0.15);
  color:#fff;
}
.main-nav a.active{
  background-color:var(--sky);
  color:#fff;
  font-weight:600;
}
.main-nav a.admin-link{
  background-color:rgba(229,57,53,0.8);
  color:#fff;
}
.main-nav a.admin-link:hover{
  background-color:rgba(229,57,53,1);
  color:#fff;
}
.main-nav a.admin-link.active{
  background-color:#C62828;
  font-weight:bold;
  border-bottom:3px solid #fff;
}
.main-nav .right{
  margin-left:auto;
  display:flex;
  align-items:center;
}
.main-nav .right span{
  color:rgba(255,255,255,0.7);
  padding:14px 16px;
  font-size:14px;
}

.tabs{display:flex;border-bottom:2px solid var(--border);margin-bottom:var(--space-4)}
.tab{
  padding:10px 20px;
  cursor:pointer;
  border:1px solid transparent;
  border-bottom:none;
  text-decoration:none;
  color:var(--muted);
  background:#f9f9f9;
  margin-right:5px;
  border-top-left-radius:6px;
  border-top-right-radius:6px;
  font-weight:500;
  transition:all 0.2s;
}
.tab.active{
  background:#fff;
  border-color:var(--border);
  border-bottom-color:#fff;
  font-weight:bold;
  color:var(--sky-dark);
}
.tab:hover{
  background:rgba(0,188,212,0.05);
  color:var(--indigo);
}

.vip-expired{color:var(--danger);font-weight:bold}
.limit-info{background-color:var(--bg);padding:10px;border-radius:4px;margin-top:5px}