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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    position: relative;
}

.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.language-selector select {
    padding: 8px 12px;
    border: 2px solid #667eea;
    border-radius: 8px;
    background: white;
    color: #333;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-selector select:hover {
    border-color: #764ba2;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.language-selector select:focus {
    outline: none;
    border-color: #764ba2;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.logo {
    font-size: 3em;
    margin-bottom: 10px;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    font-size: 1.2em;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.tool-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    flex-wrap: wrap;
    gap: 5px;
}

.tab-button {
    padding: 12px 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 10px;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #666;
    font-size: 14px;
}

.tab-button.active {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.3);
}

.tab-button:hover:not(.active) {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

.tool-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
}

.tool-panel {
    display: none;
}

.tool-panel.active {
    display: block;
}

.tool-title {
    font-size: 2em;
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
    transition: all 0.3s ease;
    cursor: pointer;
    background: rgba(102, 126, 234, 0.05);
}

.upload-area:hover {
    border-color: #764ba2;
    background: rgba(102, 126, 234, 0.1);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: rgba(102, 126, 234, 0.15);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3em;
    margin-bottom: 15px;
    color: #667eea;
}

.file-input {
    display: none;
}

.upload-button {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 10px;
}

.upload-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.control-group {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #495057;
}

.control-group input,
.control-group select,
.control-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 5px;
    font-size: 14px;
}

.control-group input[type="range"] {
    margin: 10px 0;
}

.control-group input[type="color"] {
    height: 40px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.preview-area {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.preview-panel {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    border: 1px solid #e9ecef;
}

.preview-panel h3 {
    margin-bottom: 15px;
    color: #495057;
}

.preview-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.download-button {
    background: linear-gradient(45deg, #28a745, #20c997);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 10px;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}

.download-button:disabled {
    background: #6c757d;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.color-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
    margin-top: 20px;
}

.color-swatch {
    aspect-ratio: 1;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: relative;
    transition: transform 0.2s ease;
}

.color-swatch:hover {
    transform: scale(1.1);
}

.color-code {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    white-space: nowrap;
}

.qr-preview {
    background: white;
    padding: 20px;
    border-radius: 10px;
    display: inline-block;
    margin: 20px auto;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: #e9ecef;
    border-radius: 3px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
}

.info-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.info-section h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.info-section h3 {
    color: #495057;
    margin: 25px 0 15px 0;
    font-size: 1.3em;
}

.info-section p {
    margin-bottom: 15px;
    color: #666;
    line-height: 1.7;
}

.info-section ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.info-section li {
    margin-bottom: 8px;
    color: #666;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.feature-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.feature-card h4 {
    color: #333;
    margin-bottom: 10px;
}

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

.footer {
    text-align: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    margin-top: 40px;
    color: #666;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    padding: 10px 20px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.content-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.content-section h2 {
    color: #333;
    margin-bottom: 25px;
    font-size: 1.8em;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.content-section h3 {
    color: #495057;
    margin: 25px 0 15px 0;
    font-size: 1.3em;
}

.content-section h4 {
    color: #495057;
    margin: 20px 0 10px 0;
    font-size: 1.1em;
}

.content-section p {
    margin-bottom: 15px;
    color: #666;
    line-height: 1.7;
}

.content-section ul, .content-section ol {
    margin-left: 20px;
    margin-bottom: 20px;
}

.content-section li {
    margin-bottom: 8px;
    color: #666;
}

.highlight-box {
    background: #f8f9fa;
    border-left: 4px solid #667eea;
    padding: 20px;
    margin: 20px 0;
    border-radius: 5px;
}

.contact-info {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: center;
}

.contact-info a {
    color: white;
    text-decoration: underline;
}

.last-updated {
    font-style: italic;
    color: #888;
    text-align: center;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header {
        padding: 20px;
    }

    .header h1 {
        font-size: 2em;
    }

    .language-selector {
        position: static;
        margin-bottom: 15px;
        text-align: center;
    }

    .tool-tabs {
        flex-direction: column;
    }

    .tab-button {
        margin-bottom: 5px;
    }

    .controls {
        grid-template-columns: 1fr;
    }

    .preview-area {
        grid-template-columns: 1fr;
    }

    .content-section {
        padding: 25px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }

    .contact-info-section {
        padding: 20px;
    }
}

/* Contact Form Styles */
.contact-intro {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 15px;
}

.contact-form {
    margin-bottom: 40px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    margin-bottom: 8px;
    font-weight: 500;
    color: #495057;
}

.form-group input,
.form-group textarea {
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group input:invalid,
.form-group textarea:invalid {
    border-color: #dc3545;
}

.form-group input:valid,
.form-group textarea:valid {
    border-color: #28a745;
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.submit-loading {
    display: none;
}

.contact-form.loading .submit-text {
    display: none;
}

.contact-form.loading .submit-loading {
    display: inline;
}

.contact-form.loading .upload-button {
    opacity: 0.7;
    cursor: not-allowed;
}

.contact-info-section {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    margin-top: 30px;
}

.contact-info-section h3 {
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.contact-method {
    text-align: center;
    padding: 15px;
    background: white;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.contact-method strong {
    display: block;
    margin-bottom: 8px;
    color: #495057;
}

.contact-method a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.contact-method a:hover {
    text-decoration: underline;
}

/* About Page Styles */
.about-hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 15px;
}

.team-section {
    margin-bottom: 40px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.value-item {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid #667eea;
    transition: transform 0.3s ease;
}

.value-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.15);
}

.value-item h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.2em;
}

.value-item p {
    color: #666;
    line-height: 1.6;
}

.mission-section {
    margin-bottom: 40px;
}

.technical-section {
    margin-bottom: 40px;
}

.technical-section ul {
    margin-left: 0;
    list-style: none;
}

.technical-section li {
    background: #f8f9fa;
    margin-bottom: 12px;
    padding: 15px;
    border-radius: 8px;
    border-left: 3px solid #667eea;
}

.future-section {
    margin-bottom: 40px;
}

.future-section ul {
    margin-left: 0;
    list-style: none;
}

.future-section li {
    background: rgba(102, 126, 234, 0.05);
    margin-bottom: 10px;
    padding: 12px 15px;
    border-radius: 8px;
    border-left: 3px solid #28a745;
}

.contact-section {
    margin-bottom: 40px;
}

/* User Reviews Styles */
.reviews-section {
    margin: 40px 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.review-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    border-left: 4px solid #28a745;
    position: relative;
}

.review-card::before {
    content: '"';
    font-size: 3em;
    color: #667eea;
    position: absolute;
    top: 10px;
    left: 15px;
    opacity: 0.3;
}

.review-text {
    font-style: italic;
    color: #555;
    margin-bottom: 15px;
    padding-left: 20px;
}

.review-author {
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.review-role {
    color: #667eea;
    font-size: 0.9em;
}

.review-rating {
    color: #ffc107;
    margin-bottom: 10px;
}

/* Use Cases Styles */
.use-cases-section {
    margin: 40px 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.use-case-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.use-case-card:hover {
    border-color: #667eea;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
}

.use-case-icon {
    font-size: 2.5em;
    margin-bottom: 15px;
    text-align: center;
}

.use-case-title {
    font-size: 1.3em;
    color: #333;
    margin-bottom: 10px;
    text-align: center;
}

.use-case-description {
    color: #666;
    text-align: center;
    line-height: 1.6;
}

.hidden {
    display: none !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.error {
    color: #dc3545;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}

.success {
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}