:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation Bar Styles */
.top-navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    animation: slideDown 0.5s ease-out;
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.navbar-brand {
    flex-shrink: 0;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    transition: all 0.3s ease;
}

.brand-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.brand-icon {
    font-size: 1.75rem;
    display: flex;
    align-items: center;
}

.brand-name {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--primary-color);
    transition: transform 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-icon {
    font-size: 1.1rem;
}

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

.qr-generator-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.header-section {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

.main-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    animation: fadeInUp 0.6s ease-out;
}

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.label-icon {
    font-size: 1.25rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: var(--bg-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-control:hover {
    border-color: var(--primary-light);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-text {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.upload-icon {
    font-size: 3rem;
}

.upload-placeholder p {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.upload-placeholder small {
    color: var(--text-secondary);
}

.logo-preview {
    position: relative;
    display: inline-block;
}

.logo-preview img {
    max-width: 150px;
    max-height: 150px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.btn-remove {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--error-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.btn-remove:hover {
    transform: scale(1.1);
    background: #dc2626;
}

.form-range {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
    border: none;
    box-shadow: var(--shadow-sm);
}

.format-options {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-format {
    flex: 1;
    min-width: 70px;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.btn-format:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.btn-format.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Color Picker Styles */
.color-picker-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.color-picker {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.color-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.color-input-wrapper:hover {
    border-color: var(--primary-light);
}

.form-color {
    width: 60px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-color:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.color-value {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
}

.color-presets {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.preset-btn:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

.preset-btn:active {
    transform: translateY(0);
}

.btn-generate {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
    margin-top: 1rem;
}

.btn-generate:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(99, 102, 241, 0.4);
}

.btn-generate:active:not(:disabled) {
    transform: translateY(0);
}

.btn-generate:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.vcard-preview {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
}

.vcard-preview h5 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.vcard-preview p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.vcard-preview strong {
    color: var(--text-primary);
    font-weight: 600;
}

.qr-preview {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: var(--radius-lg);
}

.qr-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease;
}

.qr-image:hover {
    transform: scale(1.02);
}

.download-section {
    margin-bottom: 1.5rem;
}

.btn-download {
    width: 100%;
    padding: 1.25rem 2rem;
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(16, 185, 129, 0.4);
}

.download-icon {
    font-size: 1.5rem;
}

.btn-download small {
    font-size: 0.875rem;
    font-weight: 400;
    opacity: 0.9;
}

.info-box {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--success-color);
}

.info-box h4 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 1.125rem;
}

.info-box p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.qr-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

.stat {
    padding: 0.75rem;
    background: white;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.stat strong {
    display: block;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.preview-placeholder {
    text-align: center;
    padding: 3rem 2rem;
}

.placeholder-icon {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.preview-placeholder h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.preview-placeholder p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.use-cases {
    margin-top: 2rem;
}

.use-cases h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.use-case {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.use-case:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.use-case .icon {
    font-size: 2rem;
}

.use-case span:last-child {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.features-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: var(--radius-lg);
    border: 2px solid rgba(99, 102, 241, 0.2);
}

.features-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.features-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.features-list strong {
    font-weight: 600;
}

/* vCard Generator Styles */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.flex-2 {
    grid-column: span 2;
}

.subsection-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.vcard-preview-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.contact-preview {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: var(--radius-lg);
}

.contact-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1rem;
    border: 4px solid white;
    box-shadow: var(--shadow-lg);
}

.contact-photo-placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    margin: 0 auto 1rem;
    border: 4px solid white;
    box-shadow: var(--shadow-md);
}

.contact-name {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0.5rem 0;
}

.contact-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0.25rem 0;
}

.contact-org {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0.25rem 0;
}

.instructions {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
}

.instructions h5 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.instructions ol {
    margin: 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.instructions li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.nav-link.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-color);
}

.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .flex-2 {
        grid-column: span 1;
    }

    .vcard-preview-container {
        gap: 1rem;
    }

    .contact-photo,
    .contact-photo-placeholder {
        width: 100px;
        height: 100px;
        font-size: 3rem;
    }

    .contact-name {
        font-size: 1.5rem;
    }
}

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

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

@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .use-case-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .navbar-menu {
        width: 100%;
        flex-direction: column;
        gap: 0.5rem;
    }

    .nav-link {
        width: 100%;
        justify-content: center;
    }

    .qr-generator-container {
        padding: 1rem 0.5rem;
    }

    .card {
        padding: 1.5rem;
    }

    .header-section {
        margin-bottom: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .format-options {
        flex-direction: column;
    }

    .btn-format {
        min-width: 100%;
    }

    .qr-stats {
        grid-template-columns: 1fr;
    }

    .use-case-grid {
        grid-template-columns: 1fr;
    }
}

/* Tablet responsive styles for navbar */
@media (max-width: 768px) {
    .navbar-menu {
        gap: 1rem;
    }

    .nav-link span:not(.nav-icon) {
        display: none;
    }

    .nav-link {
        padding: 0.5rem;
    }

    .nav-icon {
        font-size: 1.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}