:root {
  --bg: #0D1B2A;
  --surface: #1B2838;
  --card: #1E3045;
  --surface-light: #253A50;
  --accent: #3498DB;
  --accent-hover: #2980B9;
  --success: #2ECC71;
  --error: #E74C3C;
  --warning: #F39C12;
  --info: #3498DB;
  --text: #E8EDF2;
  --text-secondary: #8899AA;
  --text-hint: #5A6A7A;
  --border: #2A3E55;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

/* Login */
.login-screen {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0D1B2A 0%, #1B2838 50%, #0D1B2A 100%);
}
.login-card {
  background: var(--surface); padding: 48px; border-radius: 20px;
  width: 420px; max-width: 90vw; box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.login-logo { text-align: center; margin-bottom: 32px; }
.logo-icon { font-size: 48px; margin-bottom: 12px; }
.login-logo h1 { font-size: 24px; font-weight: 700; }
.login-logo p { color: var(--text-secondary); font-size: 14px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
.form-group input {
  width: 100%; padding: 12px 16px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px; font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus { outline: none; border-color: var(--accent); }

.btn {
  padding: 12px 24px; border: none; border-radius: var(--radius-sm); font-family: inherit;
  font-weight: 600; cursor: pointer; transition: all 0.2s; font-size: 14px;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-full { width: 100%; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 8px 16px; font-size: 12px; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--error); color: #fff; }

.error-text { color: var(--error); font-size: 13px; margin-top: 12px; text-align: center; }

/* Dashboard Layout */
.dashboard-screen { display: flex; min-height: 100vh; }

.sidebar {
  width: 260px; background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; position: fixed; height: 100vh; z-index: 10;
}
.sidebar-header { padding: 24px 20px; display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--border); }
.logo-icon-sm { font-size: 28px; }
.sidebar-title { font-size: 16px; font-weight: 700; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 16px;
  border-radius: var(--radius-sm); color: var(--text-secondary); text-decoration: none;
  font-size: 14px; font-weight: 500; transition: all 0.2s; margin-bottom: 4px;
}
.nav-item:hover { background: var(--card); color: var(--text); }
.nav-item.active { background: var(--accent); color: #fff; }
.nav-icon { font-size: 18px; width: 24px; text-align: center; }

.sidebar-footer { padding: 16px 12px; border-top: 1px solid var(--border); }

.main-content { flex: 1; margin-left: 260px; min-height: 100vh; }
.top-bar {
  padding: 20px 32px; display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--border); background: var(--surface);
}
.top-bar h2 { font-size: 22px; font-weight: 700; }
.user-info { display: flex; align-items: center; gap: 12px; }
.avatar {
  width: 36px; height: 36px; border-radius: 10px; background: var(--accent);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px;
}

.content { padding: 32px; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card {
  background: var(--card); border-radius: var(--radius); padding: 24px;
  border: 1px solid var(--border); transition: transform 0.2s;
}
.stat-card:hover { transform: translateY(-2px); }
.stat-icon { font-size: 28px; margin-bottom: 12px; }
.stat-value { font-size: 28px; font-weight: 800; margin-bottom: 4px; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

/* Table */
.data-table-wrapper { background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.table-header { padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); }
.table-header h3 { font-size: 16px; font-weight: 600; }

table { width: 100%; border-collapse: collapse; }
th { padding: 14px 20px; text-align: left; font-size: 12px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border); }
td { padding: 14px 20px; font-size: 14px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(52,152,219,0.05); }

.badge {
  display: inline-block; padding: 4px 10px; border-radius: 6px; font-size: 11px;
  font-weight: 600; text-transform: uppercase;
}
.badge-success { background: rgba(46,204,113,0.15); color: var(--success); }
.badge-warning { background: rgba(243,156,18,0.15); color: var(--warning); }
.badge-error { background: rgba(231,76,60,0.15); color: var(--error); }
.badge-info { background: rgba(52,152,219,0.15); color: var(--info); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); }
.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }

.loading { text-align: center; padding: 40px; color: var(--text-secondary); }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { width: 0; overflow: hidden; }
  .main-content { margin-left: 0; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}