:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #7209b7;
    --accent-color: #4cc9f0;
    --success-color: #2dc653;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --text-secondary: #6c757d;
    --border-radius: 12px;
    --box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

/* Authentication state management */
.auth-required-hidden {
    display: block !important;
}

.auth-required-hidden.d-none {
    display: none !important;
}

.auth-required-visible {
    display: none !important;
}

.auth-required-visible:not(.d-none) {
    display: block !important;
}

body {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--dark-color);
    transition: var(--transition);
}

/* Dark mode styles */
body.dark-mode {
    background: linear-gradient(135deg, #212529, #343a40);
    color: #f8f9fa;
}

body.dark-mode .card {
    background-color: #2b3035;
    border-color: #495057;
}

body.dark-mode .card-body,
body.dark-mode .form-control,
body.dark-mode .input-group-text {
    background-color: #343a40;
    color: #f8f9fa;
    border-color: #495057;
}

body.dark-mode .form-label,
body.dark-mode .card-title {
    color: #f8f9fa;
}

body.dark-mode .btn-outline-secondary {
    color: #f8f9fa;
    border-color: #6c757d;
}

body.dark-mode footer {
    background-color: #212529;
    color: #f8f9fa;
    border-color: #495057;
}

body.dark-mode #qrCodeContainer {
    background-color: #343a40;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding: 2rem 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.logo {
    font-size: 3rem;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-right: 0.5rem;
}

h1.display-4 {
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.lead {
    font-weight: 400;
    color: var(--gray-color);
    max-width: 600px;
    margin: 0 auto;
}

.card {
    border-radius: var(--border-radius);
    overflow: hidden;
    border: none;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 1.25rem 1.5rem;
    border-bottom: none;
}

.nav-tabs {
    border-bottom: none;
}

.nav-tabs .nav-link {
    border: none;
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.nav-tabs .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    border-bottom: 3px solid white;
    color: white;
}

.nav-tabs .nav-link:hover:not(.active) {
    color: white;
    background-color: rgba(255, 255, 255, 0.05);
    border-bottom: 3px solid rgba(255, 255, 255, 0.5);
}

.card-body {
    padding: 2rem;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: var(--dark-color);
}

.form-control {
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid #ced4da;
    transition: var(--transition);
}

.form-control:focus {
    box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
    border-color: var(--primary-color);
}

.input-group {
    border-radius: var(--border-radius);
    overflow: hidden;
}

.input-group-text {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 0 1.25rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #25a244);
    border: none;
}

.btn-success:hover {
    background: linear-gradient(135deg, #25a244, #208b3a);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(45, 198, 83, 0.3);
}

.btn-outline-secondary {
    border: 1px solid #ced4da;
    color: var(--gray-color);
}

.btn-outline-secondary:hover {
    background-color: #f8f9fa;
    color: var(--dark-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

#qrResult .card-header {
    background: linear-gradient(135deg, var(--success-color), #25a244);
}

#qrCodeContainer {
    padding: 2rem;
    background-color: white;
    border-radius: var(--border-radius);
    display: inline-block;
    margin: 0 auto 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

#qrCodeContainer img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

footer {
    background-color: white;
    padding: 1.5rem 0;
    margin-top: auto;
    border-top: 1px solid #dee2e6;
    transition: var(--transition);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-end;
    white-space: nowrap;
}

.footer-links a {
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--primary-color) !important;
}

.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    z-index: 1000;
}

.theme-toggle:hover {
    transform: translateY(-3px) rotate(15deg);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Animations */
/* Drag & Drop Zone */
.drag-drop-zone {
    border: 2px dashed #ced4da;
    border-radius: var(--border-radius);
    background-color: #f8f9fa;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

body.dark-mode .drag-drop-zone {
    border-color: #495057;
    background-color: #343a40;
}

.drag-drop-zone:hover {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.drag-drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.1);
    transform: scale(1.01);
}

.drag-drop-zone .fas {
    color: var(--gray-color);
    transition: var(--transition);
}

.drag-drop-zone:hover .fas {
    color: var(--primary-color);
}

.drag-drop-zone.dragover .fas {
    color: var(--primary-color);
}

.drag-drop-zone .file-name {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

#qrResult.show {
    animation: fadeIn 0.6s ease forwards;
}

.pulse {
    animation: pulse 1.5s infinite;
}

/* Loading spinner */
.spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.25rem;
    color: var(--primary-color);
}

/* Custom file input styling */
.form-control[type="file"] {
    padding: 0.75rem 1rem;
    cursor: pointer;
}

.form-control[type="file"]::file-selector-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    margin-right: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.form-control[type="file"]::file-selector-button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1.5rem;
    }
    
    h1.display-4 {
        font-size: 2.25rem;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
    }
    
    #qrCodeContainer {
        padding: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        margin-top: 1rem;
        justify-content: center;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
    
    .footer-links a {
        margin: 0 0.5rem;
    }
    
    .footer-content > div:first-child {
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .card-body {
        padding: 1.25rem;
    }
    
    h1.display-4 {
        font-size: 2rem;
    }
    
    .nav-tabs .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .d-md-flex {
        flex-direction: column;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        bottom: 15px;
        right: 15px;
    }
}

/* Image Preview Styling */
.image-preview-container {
    max-width: 100%;
    max-height: 200px;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin: 1rem auto;
    text-align: center;
}

.image-preview {
    max-height: 200px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
}

.image-file-name {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

body.dark-mode .image-preview-container {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    background-color: #343a40;
}
/* Additional styles for policy pages */
.policy-content h4 {
    color: var(--primary-color);
    margin-top: 2rem;
}

body.dark-mode .policy-content h4 {
    color: var(--accent-color);
}

/* About page styles */
.tech-item, .value-item {
    background-color: white;
    transition: var(--transition);
    height: 100%;
}

body.dark-mode .tech-item, 
body.dark-mode .value-item {
    background-color: #2b3035;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    text-align: center;
}

.tech-item i, .value-item i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.tech-item:hover, .value-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

/* Contact page styles */
.contact-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon i {
    font-size: 1.25rem;
}

.social-links a:hover i {
    transform: scale(1.2);
    transition: var(--transition);
}

.logo {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

body.dark-mode .logo {
    color: var(--accent-color);
}