* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
    padding: 30px 20px;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    padding: 30px;
}
h1, h2, h3 {
    color: #1e293b;
    margin-bottom: 20px;
    border-left: 5px solid #3b82f6;
    padding-left: 15px;
}
.login-box {
    background: #ffffff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
input, select, button {
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 14px;
    margin: 6px 0;
    width: 100%;
    max-width: 300px;
    transition: 0.2s;
}
button {
    background-color: #3b82f6;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
}
button:hover {
    background-color: #2563eb;
}
.btn {
    display: inline-block;
    background: #10b981;
    color: white;
    padding: 8px 20px;
    border-radius: 30px;
    text-decoration: none;
    margin-top: 10px;
}
.btn-success {
    background: #22c55e;
}
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}
.table th, .table td {
    border-bottom: 1px solid #e2e8f0;
    padding: 12px 8px;
    text-align: left;
}
.table th {
    background-color: #f8fafc;
    color: #334155;
}
.credit-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 20px;
    margin-bottom: 30px;
    text-align: center;
}
.credit-card strong {
    font-size: 32px;
    display: inline-block;
    margin: 10px 0;
}
.admin-section {
    margin: 30px 0;
    border-top: 1px solid #e2e8f0;
    padding-top: 20px;
}
.error, .message {
    background: #fee2e2;
    color: #b91c1c;
    padding: 10px;
    border-radius: 8px;
    margin: 15px 0;
}
.message {
    background: #dcfce7;
    color: #15803d;
}