/* =========================
   GLOBAL
========================= */

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

:root{
    --primary:#2563eb;
    --secondary:#7c3aed;
    --success:#16a34a;
    --danger:#dc2626;
    --dark:#111827;
    --light:#f8fafc;
}

body{
    background:#f5f7fb;
    font-family:'Segoe UI',sans-serif;
    color:#1f2937;
    min-height:100vh;
}

/* =========================
   NAVBAR
========================= */

.navbar{
    background:white;
    box-shadow:0 4px 15px rgba(0,0,0,.08);
    padding:15px 0;
}

.navbar-brand{
    font-size:28px;
    font-weight:700;
    color:var(--primary)!important;
}

/* =========================
   MAIN CARD
========================= */

.converter-card{
    border:none;
    border-radius:25px;
    background:white;
    box-shadow:0 20px 50px rgba(0,0,0,.08);
}

.converter-card .card-body{
    padding:40px;
}

/* =========================
   TITLE
========================= */

h1{
    font-weight:800;
    font-size:3rem;
    background:linear-gradient(
        135deg,
        var(--primary),
        var(--secondary)
    );
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
}

/* ===================================
   UPLOAD AREA
=================================== */

.upload-area {

    background: #eff6ff;

    border: 2px dashed #2563eb;

    border-radius: 20px;

    padding: 50px 30px;

    text-align: center;

    cursor: pointer;

    transition: all .3s ease;

}

.upload-area:hover {

    background: #dbeafe;

    border-color: #1d4ed8;

}

.upload-area.dragover {

    background: #bfdbfe;

    border-color: #1e40af;

    transform: scale(1.02);

}

.upload-icon {

    font-size: 70px;

    color: #2563eb;

    margin-bottom: 20px;

}

.upload-area h3 {

    color: #1d4ed8;

    font-size: 1.7rem;

    font-weight: 700;

    margin-bottom: 10px;

}

.upload-area p {

    color: #475569;

    margin-bottom: 8px;

}

.upload-area .btn-primary {

    background: #2563eb;

    border: none;

    border-radius: 10px;

    padding: 12px 30px;

    font-weight: 600;

}

.upload-area .btn-primary:hover {

    background: #1d4ed8;

}

.upload-area .btn-outline-primary {

    border: 2px solid #2563eb;

    color: #2563eb;

    border-radius: 10px;

    padding: 12px 30px;

    font-weight: 600;

}

.upload-area .btn-outline-primary:hover {

    background: #2563eb;

    color: #ffffff;

}

/* =========================
   SETTINGS
========================= */

.settings-card{

    background:#fafcff;

    border-radius:20px;

    padding:25px;

    border:1px solid #e5e7eb;
}

.settings-card h4{

    font-weight:700;
}

/* =========================
   FILE LIST
========================= */

#fileList{

    margin-bottom:25px;
}

#fileList .card{

    border:none;

    border-radius:18px;

    box-shadow:
        0 8px 20px rgba(0,0,0,.08);

    transition:.3s;
}

#fileList .card:hover{

    transform:translateY(-3px);
}

.preview-image{

    width:100px;

    height:100px;

    object-fit:cover;

    border-radius:12px;

    border:2px solid #e5e7eb;
}
/* =========================
   SUMMARY CARD
========================= */

#summaryCard{

    border:none;

    border-radius:15px;

    font-weight:600;
}

/* =========================
   BUTTONS
========================= */

.btn-primary{

    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--secondary)
        );

    border:none;

    font-weight:700;

    border-radius:12px;

    padding:12px 25px;
}

.btn-primary:hover{

    transform:translateY(-2px);
}

.btn-success{

    background:
        linear-gradient(
            135deg,
            #16a34a,
            #22c55e
        );

    border:none;

    font-weight:700;

    border-radius:12px;
}

.btn-success:hover{

    transform:translateY(-2px);
}

.btn-secondary{

    border-radius:12px;
}

/* =========================
   RESULT CARD
========================= */

.result-card{

    margin-top:40px;
}

.result-card .card{

    border:none;

    border-radius:20px;

    box-shadow:
        0 8px 20px rgba(0,0,0,.08);
}

/* =========================
   ALERTS
========================= */

.alert{

    border:none;

    border-radius:15px;
}

.alert-success{

    background:#dcfce7;

    color:#166534;
}

/* =========================
   PROGRESS BAR
========================= */

.progress{

    height:35px;

    border-radius:30px;

    overflow:hidden;

    background:#e5e7eb;
}

.progress-bar{

    font-weight:bold;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--secondary)
        );
}

/* =========================
   BADGES
========================= */

.badge{

    font-size:13px;

    padding:8px 12px;
}

/* =========================
   DARK MODE
========================= */

.dark-mode{

    background:#111827;

    color:white;
}

.dark-mode .converter-card{

    background:#1f2937;
}

.dark-mode .navbar{

    background:#1f2937;
}

.dark-mode .settings-card{

    background:#374151;

    border:none;
}

.dark-mode .upload-area{

    background:#374151;
}

.dark-mode .card{

    background:#374151;

    color:white;
}

.dark-mode .text-muted{

    color:#d1d5db !important;
}

/* =========================
   SCROLLBAR
========================= */

::-webkit-scrollbar{

    width:8px;
}

::-webkit-scrollbar-thumb{

    background:var(--primary);

    border-radius:20px;
}
/* ===================================
   HIDE REORDER & ROTATE CONTROLS
=================================== */

.move-up-btn,
.move-down-btn,
.drag-handle,
.reorder-btn,
.rotate-btn,
.rotate-left-btn,
.rotate-right-btn,
button[onclick*="rotateLeft"],
button[onclick*="rotateRight"]{
    display:none !important;
}

/* ===================================
   TABLET (768px - 991px)
=================================== */

@media (max-width:991px){

    .converter-card{
        margin-bottom:50px;
    }

    .converter-card .card-body{
        padding:25px;
    }

    h1{
        font-size:2.2rem;
        text-align:center;
    }

    .alert{
        font-size:15px;
    }

    #mergeInfoCard .card-body{
        padding:20px;
    }

    #mergeInfoRow{
        text-align:center;
    }

    #mergeInfoRow .col-md-4{
        margin-bottom:15px;
    }

    #previewMergedBtn,
    #downloadBtn,
    #convertMoreBtn{
        width:100%;
        margin-top:10px !important;
    }

    .modal-dialog{
        max-width:95%;
    }

    #previewFrame{
        height:600px;
    }
}

/* ===================================
   MOBILE (576px - 767px)
=================================== */

@media (max-width:767px){

    .container{
        padding-left:12px;
        padding-right:12px;
    }

    .converter-card{
        margin-bottom:50px;
        border-radius:18px;
    }

    .converter-card .card-body{
        padding:18px 14px;
    }

    h1{
        font-size:1.8rem;
        line-height:1.3;
        text-align:center;
    }

    /* Summary */

    #summaryCard{
        font-size:13px;
    }

    /* Success Alert */

    .alert-success{
        font-size:14px;
        padding:14px;
    }

    /* Result Card */

    #mergeInfoCard{
        border-radius:14px;
    }

    #mergeInfoRow{
        text-align:left;
    }

    #mergeInfoRow .col-md-4{
        margin-bottom:12px;
    }

    #pdfName{
        font-size:14px;
    }

    /* Result Buttons */

    #previewMergedBtn,
    #downloadBtn,
    #convertMoreBtn{
        width:100%;
        margin-top:10px !important;
    }

    .btn-lg{
        font-size:14px;
        padding:12px;
    }

    /* PDF Preview */

    .modal-dialog{
        max-width:98%;
        margin:10px auto;
    }

    #previewFrame{
        height:500px;
    }
}

/* ===================================
   SMALL MOBILE (320px - 575px)
=================================== */

@media (max-width:575px){

    .converter-card{
        margin-bottom:50px;
    }

    .converter-card .card-body{
        padding:15px 12px;
    }

    h1{
        font-size:1.5rem;
    }

    #summaryCard{
        font-size:12px;
    }

    .alert-success{
        font-size:13px;
        padding:12px;
    }

    #mergeInfoCard .card-body{
        padding:15px;
    }

    #mergeInfoRow{
        text-align:center;
    }

    #pdfName{
        font-size:13px;
    }

    .btn-lg{
        font-size:13px;
        padding:10px;
    }

    #previewMergedBtn,
    #downloadBtn,
    #convertMoreBtn{
        width:100%;
        margin-top:8px !important;
    }

    #previewFrame{
        height:400px;
    }
}