* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { display: flex; background-color: #f4f6f9; color: #333; }
.sidebar { width: 260px; height: 100vh; background: #1f2937; color: #fff; position: fixed; padding: 20px 0; }
.sidebar h2 { text-align: center; margin-bottom: 30px; font-size: 22px; letter-spacing: 1px; color: #38bdf8; }
.sidebar a { display: block; padding: 15px 25px; color: #cbd5e1; text-decoration: none; transition: 0.3s; font-size: 16px; }
.sidebar a:hover, .sidebar a.active { background: #374151; color: #fff; border-left: 4px solid #38bdf8; }
.main-content { margin-left: 260px; padding: 40px; width: calc(100% - 260px); min-height: 100vh; }
.card-row { display: flex; gap: 20px; margin-bottom: 30px; }
.card { background: #fff; padding: 25px; border-radius: 12px; flex: 1; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.card h3 { font-size: 14px; text-transform: uppercase; color: #64748b; margin-bottom: 10px; }
.card p { font-size: 28px; font-weight: bold; color: #0f172a; }
.table-container { background: #fff; padding: 20px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 14px 16px; border-bottom: 1px solid #e2e8f0; }
th { background-color: #f8fafc; color: #475569; font-weight: 600; }
.btn { padding: 6px 12px; border-radius: 6px; text-decoration: none; font-size: 14px; cursor: pointer; display: inline-block; border: none;}
.btn-edit { background: #e0f2fe; color: #0369a1; margin-right: 5px; }
.btn-delete { background: #fee2e2; color: #b91c1c; }
.btn-submit { background: #38bdf8; color: white; padding: 10px 20px; border-radius: 6px; width: 100%; margin-top: 15px;}
.login-box { width: 400px; margin: 100px auto; background: white; padding: 30px; border-radius: 12px; box-shadow: 0 10px 15px rgba(0,0,0,0.1); }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-group input { width: 100%; padding: 10px; border: 1px solid #cbd5e1; border-radius: 6px; }