*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family: 'Segoe UI', sans-serif;
}

body{
    background:#f2f4f7;
}

/* App Header */
.app-header{
    background:#0d6efd;
    color:white;
    padding:15px;
    text-align:center;
    font-size:18px;
    position:fixed;
    width:100%;
    top:0;
    z-index:1000;
}

/* Main Content */
.content{
    padding:80px 15px 80px 15px;
}

/* Card */
.card{
    background:white;
    padding:15px;
    margin-bottom:15px;
    border-radius:12px;
    box-shadow:0 2px 8px rgba(0,0,0,0.1);
}

/* Buttons */
.btn{
    background:#0d6efd;
    color:white;
    padding:10px;
    text-align:center;
    border-radius:8px;
    display:inline-block;
    text-decoration:none;
    margin-top:10px;
}

/* Bottom Navigation */
.bottom-nav{
    position:fixed;
    bottom:0;
    width:100%;
    background:white;
    display:flex;
    justify-content:space-around;
    border-top:1px solid #ddd;
    padding:10px 0;
}

.bottom-nav a{
    text-decoration:none;
    color:#555;
    font-size:14px;
    text-align:center;
}

.bottom-nav a.active{
    color:#0d6efd;
}