:root {
    --primary-color: #4a90e2; /* Nice Blue */
    --secondary-color: #2c3e50; /* Dark Blue/Grey */
    --bg-color: #f4f7f6;
    --text-color: #333;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

/* Common Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Cards */
.card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: 0.3s;
}

.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { background-color: #357abd; }

.btn-secondary { background-color: var(--secondary-color); color: white; }

/* Inputs */
input, select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box; /* Fixes padding issues */
}