/* =========================
RESET
========================= */
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family: Arial, sans-serif;
}

/* =========================
BODY
========================= */
body{
    background:#f4f6f9;
    color:#333;
}

/* =========================
NAVBAR
========================= */
nav{
    background:#2c3e50;
    padding:15px 30px;
}

nav a{
    color:white;
    margin-right:20px;
    text-decoration:none;
    font-weight:bold;
}

/* =========================
TITLE
========================= */
h1{
    text-align:center;
    margin:30px 0;
}

/* =========================
SEARCH
========================= */
.search-box{
    max-width:900px;
    margin:20px auto;
}

.search-box input{
    width:100%;
    padding:12px;
    border-radius:8px;
    border:1px solid #ccc;
    font-size:16px;
    margin-bottom:10px;
}

/* =========================
FILTERS
========================= */
.filters{
    display:flex;
    gap:10px;
}

.filters select{
    flex:1;
    padding:10px;
    border-radius:6px;
    border:1px solid #ccc;
}

/* =========================
BOOK GRID
========================= */
#books{
    max-width:1100px;
    margin:30px auto;
    display:grid;
    grid-template-columns:repeat(auto-fill, minmax(220px,1fr));
    gap:20px;
}

.card{
    background:white;
    border-radius:10px;
    overflow:hidden;
    box-shadow:0 5px 15px rgba(0,0,0,0.1);
    transition:0.2s;
}

.card:hover{
    transform:translateY(-5px);
}

.card img{
    width:100%;
    height:250px;
    object-fit:cover;
}

.card-content{
    padding:15px;
}

.card-content h3{
    margin-bottom:5px;
}

.card-content p{
    font-size:14px;
    color:#666;
}

.link{
    text-decoration:none;
    color:inherit;
}

/* =========================
ADD BOOK CONTAINER
========================= */
.add-container{
    max-width:900px;
    margin:50px auto;
    background:white;
    padding:40px;
    border-radius:12px;
    box-shadow:0 10px 25px rgba(0,0,0,0.1);
}

.add-container h1{
    margin-bottom:10px;
}

.add-container .sub{
    text-align:center;
    color:#777;
    margin-bottom:25px;
}

/* FORM */
.add-container form{
    display:flex;
    flex-direction:column;
    gap:12px;
}

/* LABEL */
.add-container label{
    font-weight:bold;
}

/* INPUTS */
.add-container input,
.add-container select,
.add-container textarea{
    padding:12px;
    border:1px solid #ccc;
    border-radius:6px;
    font-size:14px;
    transition:0.2s;
}

/* FOCUS EFFECT */
.add-container input:focus,
.add-container select:focus,
.add-container textarea:focus{
    border-color:#3498db;
    outline:none;
    box-shadow:0 0 5px rgba(52,152,219,0.3);
}

/* TEXTAREA */
.add-container textarea{
    min-height:120px;
    resize:vertical;
}

/* SMALL TEXT */
.add-container small{
    color:#777;
    font-size:12px;
    margin-top:-8px;
}

/* BUTTON */
.btn-main{
    margin-top:20px;
    width:100%;
    padding:15px;
    background:#3498db;
    color:white;
    border:none;
    border-radius:8px;
    font-size:16px;
    cursor:pointer;
    transition:0.3s;
}

.btn-main:hover{
    background:#2980b9;
}

/* =========================
POPUP
========================= */
.popup{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.5);
    display:flex;
    justify-content:center;
    align-items:center;
    z-index:9999;
}

.popup-box{
    background:white;
    padding:30px;
    border-radius:12px;
    text-align:center;
    width:350px;
    box-shadow:0 10px 30px rgba(0,0,0,0.3);
    animation: pop 0.2s ease;
}

/* SUCCESS / ERROR */
.success-box{
    border-left:5px solid #27ae60;
}

.error-box{
    border-left:5px solid #e74c3c;
}

.popup-box h2{
    margin-bottom:20px;
}

/* CLOSE BUTTON */
.close-btn{
    margin-top:15px;
    background:#2c3e50;
    color:white;
    border:none;
    padding:10px 20px;
    border-radius:6px;
    cursor:pointer;
}

.close-btn:hover{
    background:#1a252f;
}

/* ANIMATION */
@keyframes pop{
    from{
        transform:scale(0.8);
        opacity:0;
    }
    to{
        transform:scale(1);
        opacity:1;
    }
}

/* =========================
MOBILE
========================= */
@media(max-width:700px){

    .filters{
        flex-direction:column;
    }

    #books{
        grid-template-columns:1fr;
    }

    .add-container{
        margin:20px;
        padding:20px;
    }
}