body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}


body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
    animation: backgroundShift 20s ease-in-out infinite;
    z-index: -1;
}

@keyframes backgroundShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}


.form-input {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.form-input:focus {
    background: rgba(255, 255, 255, 0.95);
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: all 0.3s ease;
}

.form-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}


:root {
    --card-width: 323px;
    --card-height: 204px;
    --card-bg-color: #2c274c; 
    --accent-color: #e0ca70; 
}

.id-card-container {
    width: var(--card-width);
    height: var(--card-height);
    box-sizing: border-box;
    background: var(--card-bg-color);
    color: white;
    border-radius: 12px;
    padding: 12px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    font-family: 'Poppins', sans-serif;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    transform: scale(1.2);
    transform-origin: center;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: all 0.3s ease-in-out;
}


.id-card-container.design-1 {
    background: linear-gradient(135deg, #2c274c 0%, #1a1a2e 100%);
}

.id-card-container.design-2 {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
}

.id-card-container.design-3 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.id-card-container.design-4 {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.id-card-container.design-5 {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.id-card-container.design-6 {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.id-card-container.design-7 {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.id-card-container.design-8 {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}


.id-card-container.design-1::before {
    background: radial-gradient(circle, #e0ca70, #c9a84f);
}

.id-card-container.design-2::before {
    background: radial-gradient(circle, #4facfe, #00f2fe);
}

.id-card-container.design-3::before {
    background: radial-gradient(circle, #f093fb, #f5576c);
}

.id-card-container.design-4::before {
    background: radial-gradient(circle, #43e97b, #38f9d7);
}

.id-card-container.design-5::before {
    background: radial-gradient(circle, #fa709a, #fee140);
}

.id-card-container.design-6::before {
    background: radial-gradient(circle, #a8edea, #fed6e3);
}

.id-card-container.design-7::before {
    background: radial-gradient(circle, #667eea, #764ba2);
}

.id-card-container.design-8::before {
    background: radial-gradient(circle, #1e3c72, #2a5298);
}


.id-card-container.design-1 * {
    color: white !important;
}


.id-card-container.design-2 * {
    color: white !important;
}


.id-card-container.design-3 * {
    color: white !important;
}


.id-card-container.design-4 * {
    color: white !important;
}


.id-card-container.design-5 * {
    color: #1a1a2e !important;
}


.id-card-container.design-6 * {
    color: #1a1a2e !important;
}


.id-card-container.design-7 * {
    color: #2c274c !important;
}


.id-card-container.design-8 * {
    color: #1a1a2e !important;
}


.id-card-container.design-5 #cardIssueDate,
.id-card-container.design-6 #cardIssueDate,
.id-card-container.design-7 #cardIssueDate,
.id-card-container.design-8 #cardIssueDate {
    color: #1a1a2e !important;
}


.id-card-container.design-5 #cardPrincipalNameText,
.id-card-container.design-6 #cardPrincipalNameText,
.id-card-container.design-7 #cardPrincipalNameText,
.id-card-container.design-8 #cardPrincipalNameText {
    color: #2c274c !important;
}


.back-card * {
    color: white !important;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}


.id-card-container.design-5 #cardStudentPhoto,
.id-card-container.design-6 #cardStudentPhoto,
.id-card-container.design-7 #cardStudentPhoto,
.id-card-container.design-8 #cardStudentPhoto {
    border: 3px solid #1a1a2e;
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}


.id-card-container.design-5::before,
.id-card-container.design-6::before,
.id-card-container.design-7::before,
.id-card-container.design-8::before {
    opacity: 0.7;
}


.id-card-container.design-7::before {
    background: radial-gradient(circle, #667eea, #764ba2);
    opacity: 0.8;
}

.id-card-container.design-8::before {
    background: radial-gradient(circle, #1e3c72, #2a5298);
    opacity: 0.8;
}


.id-card-container.download-mode {
    transform: scale(1);
}


.id-card-container::before {
    content: '';
    position: absolute;
    top: -120px;
    left: -120px;
    width: 280px;
    height: 200px;
    background: radial-gradient(circle, #e0ca70, #c9a84f);
    border-radius: 50%;
    z-index: 0;
    opacity: 0.9;
}


.id-card-container::after {
    content: '';
    position: absolute;
    top: -80px;
    right: -130px;
    width: 200px;
    height: 350px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    z-index: 1;
}


.id-card-container > * {
    position: relative;
    z-index: 2;
}

#cardIssueDateWrapper {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 10px;
    font-weight: 600;
    color: var(--card-bg-color);
}

.top-right-info {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
}

#cardCollegeName {
     font-weight: 700;
     font-size: 10px;
}

#cardWebsiteText {
    font-size: 9px;
    font-weight: 500;
    width: 75px;
}

#cardStudentPhoto {
    width: 95px;
    height: 95px;
    border-radius: 50%;
    border: 3px solid white;
    object-fit: cover;
    position: absolute;
    top: 38px;
    left: auto;
    box-shadow: 0 4px 15px rgba(0,0,0,0.25);
}

.details-section {
    position: absolute;
    top: 60px;
    left: 110px;
    right: 12px;
    display: grid;
    grid-template-columns: 45px 1fr;
    gap: 4px 8px;
    font-size: 9px;
}

.details-section .label {
    font-weight: 500;
    opacity: 0.8;
    text-align: right;
}

.details-section .value {
    font-size: 9px;
    font-weight: 600;
    word-break: break-word;
}

#cardName {
    position: absolute;
    bottom: 12px;
    left: 12px;
    font-size: 14px;
    font-weight: 700;
    line-height: 1.2;
    max-width: 150px;
}

.signature-section {
    position: absolute;
    bottom: 8px;
    right: 15px;
    text-align: center;
    z-index: 10;
}

#cardPrincipalNameText {
    font-family: 'Great Vibes', cursive;
    font-size: 12px;
    line-height: 1;
    color: white;
    text-shadow: 0 0 1px rgba(255,255,255,0.5);
}

#cardPrincipalCaption {
    font-size: 6px;
    font-weight: 500;
    opacity: 1.0;
    color: white;
    margin-top: 2px;
    padding-top: 2px;
}


.file-input-button {
    display: inline-block; padding: 0.25rem 0.5rem; font-size: 0.75rem; background-color: #4B5563; color: white; border-radius: 0.375rem; cursor: pointer; transition: all 0.2s; text-align: center;
}

.file-input-button:hover { background-color: #374151; transform: scale(1.05); }
.file-input-button:active { transform: scale(0.95); }


.sponsor-logo{ transition: filter 0.3s ease, transform 0.2s ease, opacity 0.3s ease; }
.sponsor-logo:hover{ filter: invert(21%) sepia(94%) saturate(7486%) hue-rotate(1deg) brightness(103%) contrast(106%); }
.sponsor-logo:active{ transform: scale(1.12); }


.website-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}


#cardIssueDate {
    color: var(--card-bg-color);
    font-weight: 600;
}


.id-card-container * {
    box-sizing: border-box;
}




.id-card-container * {
    color: white;
    font-family: 'Poppins', sans-serif;
}


#cardIssueDateWrapper {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 10px;
    font-weight: 600;
    color: #2c274c;
    z-index: 3;
}


#cardCollegeName, #cardWebsiteText, #cardName, #cardPrincipalNameText, #cardPrincipalCaption {
    color: white;
}

.details-section .label, .details-section .value {
    color: white;
}


.back-card {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border: 2px solid #e0ca70;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 8px;
    box-sizing: border-box;
}

.back-card::before {
    content: '';
    position: absolute;
    top: -30px;
    right: -30px;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, rgba(224, 202, 112, 0.08), transparent);
    border-radius: 50%;
    z-index: 1;
}

.back-card::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: -20px;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(224, 202, 112, 0.05), transparent);
    border-radius: 50%;
    z-index: 1;
}

.back-card-header {
    text-align: center;
    margin-bottom: 8px;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.back-card-title {
    font-size: 11px;
    font-weight: 700;
    color: #e0ca70;
    margin-bottom: 2px;
    letter-spacing: 0.5px;
}

.back-card-subtitle {
    font-size: 6px;
    color: #b8b8b8;
    font-weight: 500;
}

.back-card-content {
    flex: 1;
    position: relative;
    z-index: 2;
    margin-bottom: 6px;
    overflow: hidden;
}

.back-card-section {
    margin-bottom: 4px;
}

.back-card-section-title {
    font-size: 10px;
    font-weight: 700;
    color: #e0ca70;
    margin-bottom: 2px;
    letter-spacing: 0.3px;
}

.back-card-section-text {
    font-size: 7px;
    color: #ffffff;
    line-height: 1.2;
    text-align: left;
    margin-bottom: 3px;
}

.back-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    position: relative;
    z-index: 2;
    margin-top: 4px;
    flex-shrink: 0;
    min-height: 20px;
}

.back-card-contact {
    flex: 1;
    max-width: 60%;
}

.back-card-contact-title {
    font-size: 6px;
    font-weight: 700;
    color: #e0ca70;
    margin-bottom: 2px;
}

.back-card-contact-info {
    font-size: 6.5px;
    color: #d0d0d0;
    line-height: 1.1;
}

.back-card-contact-info div {
    margin-bottom: 1px;
    word-break: break-all;
}

.back-card-signature {
    text-align: center;
    margin-left: 8px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 25px;
    position: relative;
    padding: 2px 0;
}

.back-card-signature-line {
    width: 50px;
    height: 1px;
    background: #e0ca70;
    margin: 2px auto 0;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.back-card-signature-text {
    font-family: 'Great Vibes', cursive;
    font-size: 9px;
    color: white;
    font-weight: 600;
    line-height: 1.1;
    text-align: center;
    white-space: nowrap;
    overflow: visible;
    max-width: 65px;
    position: relative;
    z-index: 3;
    margin-bottom: 4px;
    display: block;
    visibility: visible;
    opacity: 1;
}


.id-card-container {
    transition: all 0.3s ease-in-out;
}

.id-card-container.hidden {
    display: none !important;
}

.id-card-container.show {
    display: block !important;
}

.titlebtn {
    position: absolute;
    font-size: 10px;
    left: -8px;   
    top: 360px;
    color: grey;
    opacity: 1.5;
}

.titleofbtn {
    position: absolute;
    font-size: 10px;
    right: -8px;
    top: 360px;
    color: grey;
    opacity: 1.5;
}

#previousBackgroundBtn, #nextBackgroundBtn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* Mobile-friendly improvements */
    min-width: 48px;
    min-height: 48px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
}

#previousBackgroundBtn {
    left: 16px;
    background: linear-gradient(135deg, #4b5563 0%, #374151 100%);
    box-shadow: 0 4px 15px rgba(75, 85, 99, 0.3);
}

#nextBackgroundBtn {
    right: 16px;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

#previousBackgroundBtn:hover {
    background: linear-gradient(135deg, #374151 0%, #1f2937 100%);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 20px rgba(75, 85, 99, 0.4);
}

#nextBackgroundBtn:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

#previousBackgroundBtn:active, #nextBackgroundBtn:active {
    transform: translateY(-50%) scale(0.95);
}

#previousBackgroundBtn i, #nextBackgroundBtn i {
   width: 20px;
}


@media (max-width: 768px) {
    #previousBackgroundBtn {
        top: 35px;
        left: -15px;
        min-width: 44px;
        min-height: 44px;
        padding: 12px;
    }
    
    #nextBackgroundBtn {
        top: 25px;
        right: -14px;
        min-width: 44px;
        min-height: 44px;
        padding: 12px;
    }

    .titlebtn {
        top: 320px;
        left: 5px;
        font-size: 8px;
        opacity: 1.5;
        width: 100px;
    }
    

    .titleofbtn {
        top: 320px;
        right: 5px;
        font-size: 8px;
        opacity: 1.5;
        border-radius: 16px;
        width: 100px;
    }

    #previousBackgroundBtn i, #nextBackgroundBtn i {
        width: 18px;
        height: 18px;
    }
}