/* =======================
   CSS Tổng thể + Light/Dark Mode
======================= */

/* body và main */
html,
body {
    height: 100%;
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
}

/* Header */
header,
.navbar {
    background-color: #007bff !important; 
} 

button {
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

.doc-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    cursor: pointer;
    border: 1px solid transparent;
}