:root {
    --primary: #0056b3;
    --primary-hover: #004085;
    --success: #28a745;
    --success-hover: #218838;
    --warning: #ffc107;
    --danger: #dc3545;
    --dark: #1e293b;
    --light: #f8f9fa;
    --gray: #6c757d;
    --border: #e2e8f0;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #f4f6f9;
    color: var(--dark);
    margin: 0;
    padding: 0;
}

/* কন্টেইনার ও গ্রিড লেআউট */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ফর্ম এলিমেন্টস */
input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 15px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

/* বাটন স্টাইল */
.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 15px;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    border-radius: 6px;
    cursor: pointer;
    border: none;
    transition: 0.2s;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-success { background-color: var(--success); color: white; }
.btn-success:hover { background-color: var(--success-hover); }

/* ব্যাজসমূহ */
.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: bold;
}
.badge-paid { background: #d4edda; color: #155724; }
.badge-pending { background: #fff3cd; color: #856404; }