:root {
  --bg-primary: #0d1b2a;
  --bg-secondary: #1b263b;
  --bg-card: #233554;
  --accent-blue: #3a86ff;
  --accent-green: #22c55e;
  --accent-cyan: #06b6d4;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; background: var(--bg-primary); color: var(--text-primary); }
.app-container { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar { width: 240px; background: var(--bg-secondary); padding: 20px; display: flex; flex-direction: column; border-right: 1px solid var(--border-color); position: fixed; top: 0; bottom: 0; left: 0; }
.sidebar-header { margin-bottom: 30px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 16px; color: var(--text-primary); }
.sidebar-nav { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: var(--radius); color: var(--text-secondary); text-decoration: none; font-size: 14px; transition: all 0.2s; }
.nav-item:hover { background: var(--bg-card); color: var(--accent-blue); }
.nav-item.active { background: var(--bg-card); color: var(--accent-blue); border-left: 3px solid var(--accent-blue); }
.icon { font-size: 18px; }
.sidebar-footer { padding-top: 16px; border-top: 1px solid var(--border-color); }
.user-info { display: flex; align-items: center; gap: 8px; padding: 8px 16px; font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }

/* Main content */
.main-content { flex: 1; padding: 30px; overflow-y: auto; margin-left: 240px; }
.page-header { margin-bottom: 30px; }
.page-title { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.page-subtitle { color: var(--text-secondary); font-size: 14px; }

/* Stats Grid */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; margin-bottom: 30px; }
.stat-card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border: 1px solid var(--border-color); }
.stat-card .label { color: var(--text-secondary); font-size: 13px; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-card .value { font-size: 36px; font-weight: 700; color: var(--accent-blue); }
.stat-card .value.green { color: var(--accent-green); }
.stat-card .value.cyan { color: var(--accent-cyan); }

/* Cards */
.card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); border: 1px solid var(--border-color); margin-bottom: 20px; }
.card-header { font-size: 18px; font-weight: 600; margin-bottom: 16px; color: var(--text-primary); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; border-radius: var(--radius); font-size: 14px; font-weight: 500; cursor: pointer; border: none; text-decoration: none; transition: all 0.2s; }
.btn-primary { background: var(--accent-blue); color: white; }
.btn-primary:hover { background: #2563eb; transform: translateY(-1px); }
.btn-success { background: var(--accent-green); color: white; }
.btn-success:hover { background: #16a34a; }

/* Forms */
input, select, textarea { width: 100%; padding: 12px 16px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); color: var(--text-primary); font-size: 14px; outline: none; transition: border-color 0.2s; }
input:focus, select:focus, textarea:focus { border-color: var(--accent-blue); }
input::placeholder, textarea::placeholder { color: var(--text-secondary); }

/* Table */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border-color); }
th { color: var(--text-secondary); font-weight: 500; font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; }
tr:hover td { background: rgba(58,134,255,0.05); }

/* Badges */
.badge { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge-green { background: rgba(34,197,94,0.15); color: var(--accent-green); }
.badge-blue { background: rgba(58,134,255,0.15); color: var(--accent-blue); }
.badge-cyan { background: rgba(6,182,212,0.15); color: var(--accent-cyan); }

/* Upload zone */
.upload-zone { border: 2px dashed var(--border-color); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; transition: all 0.2s; }
.upload-zone:hover { border-color: var(--accent-blue); background: rgba(58,134,255,0.05); }

/* Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; }
.alert-success { background: rgba(34,197,94,0.15); color: var(--accent-green); border: 1px solid rgba(34,197,94,0.3); }
.alert-error { background: rgba(239,68,68,0.15); color: #ef4444; border: 1px solid rgba(239,68,68,0.3); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }