* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: Tahoma, Arial, sans-serif; background: #f0f2f5; }

.screen { min-height: 100vh; }
.hidden { display: none !important; }

/* Login */
#login-screen { display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #4CAF50, #2E7D32); }
.login-box { background: #fff; padding: 40px; border-radius: 16px; box-shadow: 0 8px 32px rgba(0,0,0,0.2); width: 400px; max-width: 90vw; }
.login-box h1 { text-align: center; margin-bottom: 30px; color: #333; }
.login-box input { width: 100%; padding: 12px 16px; margin-bottom: 16px; border: 1px solid #ddd; border-radius: 8px; font-size: 15px; }
.login-box button { width: 100%; padding: 14px; background: #4CAF50; color: #fff; border: none; border-radius: 8px; font-size: 16px; cursor: pointer; }
.login-box button:hover { background: #388E3C; }
.error { color: #d32f2f; text-align: center; margin-top: 10px; font-size: 14px; }

/* Dashboard */
#dashboard { display: flex; }
.sidebar { width: 240px; background: #1a1a2e; color: #fff; min-height: 100vh; padding: 20px 0; }
.sidebar h2 { text-align: center; margin-bottom: 30px; }
.nav-btn { display: block; width: 100%; padding: 14px 24px; background: none; border: none; color: #ccc; text-align: right; cursor: pointer; font-size: 15px; }
.nav-btn:hover, .nav-btn.active { background: rgba(255,255,255,0.1); color: #fff; }
.logout-btn { margin-top: 30px; color: #f44336; }

.content { flex: 1; padding: 30px; overflow-y: auto; }
.page { display: none; }
.page.active { display: block; }
.page h1 { margin-bottom: 24px; color: #333; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.stat-card { background: #fff; padding: 24px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.stat-card h3 { color: #666; font-size: 14px; margin-bottom: 10px; }
.stat-card span { font-size: 32px; font-weight: bold; color: #333; }
.stat-card.green span { color: #4CAF50; }
.stat-card.red span { color: #f44336; }
.stat-card.blue span { color: #2196F3; }
.stat-card.gold span { color: #FF9800; }

/* Table */
table { width: 100%; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.08); margin-top: 16px; }
th, td { padding: 12px 16px; text-align: right; border-bottom: 1px solid #eee; }
th { background: #f5f5f5; font-weight: bold; color: #333; }
tr:hover { background: #fafafa; }

/* Buttons */
.btn-primary { padding: 10px 24px; background: #4CAF50; color: #fff; border: none; border-radius: 8px; cursor: pointer; font-size: 15px; }
.btn-primary:hover { background: #388E3C; }
.btn-sm { padding: 6px 12px; border: none; border-radius: 4px; cursor: pointer; font-size: 13px; }
.btn-extend { background: #2196F3; color: #fff; }
.btn-delete { background: #f44336; color: #fff; }

/* Status badges */
.badge { padding: 4px 12px; border-radius: 12px; font-size: 12px; font-weight: bold; }
.badge-active { background: #c8e6c9; color: #2e7d32; }
.badge-inactive { background: #e0e0e0; color: #666; }
.badge-expired { background: #ffcdd2; color: #c62828; }

/* Settings form */
#settings-form { background: #fff; padding: 30px; border-radius: 12px; max-width: 600px; }
#settings-form h2 { margin: 20px 0 10px; color: #333; }
#settings-form label { display: block; margin: 12px 0 6px; color: #555; font-size: 14px; }
#settings-form input, #settings-form select { width: 100%; padding: 10px 14px; border: 1px solid #ddd; border-radius: 8px; font-size: 15px; }
#settings-form button { margin-top: 24px; }