:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --dark-gradient: linear-gradient(135deg, #434343 0%, #000000 100%);
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --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);
    
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

.qr-generator-container {
    max-width: 1200px;
    margin: 20px auto;
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.qr-header {
    background: var(--primary-gradient);
    color: white;
    padding: 40px;
    text-align: center;
}

.qr-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    margin-top: 0;
}

.qr-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin: 0;
}

.icon-gradient {
    background: linear-gradient(45deg, #ffd700, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.2em;
}

.qr-content {
    padding: 40px;
    background: var(--bg-secondary);
}

.form-section {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.form-section h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 25px;
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.form-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
}

.section-icon {
    font-size: 1.3em;
    padding: 8px;
    background: var(--success-gradient);
    border-radius: 8px;
}

/* TEMPLATE GRID - DESKTOP: 3 COLUMNS, MOBILE: 2 COLUMNS */
.template-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-top: 20px;
}

.template-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.template-btn:hover {
    transform: translateY(-3px);
    border-color: #667eea;
    box-shadow: var(--shadow-md);
}

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

.template-icon {
    font-size: 2rem;
}

.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.modern-input, .modern-select {
    width: 100%;
    padding: 5px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    font-family: inherit;
    background: white;
    color: #333;
    transition: var(--transition);
    box-sizing: border-box;
}

.modern-select {
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23333' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
    padding-right: 50px;
}

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

/* DROPDOWN FIXES FOR ALL BROWSERS */
select, 
select option,
.modern-select,
.modern-select option {
    color: #333333 !important;
    background-color: #ffffff !important;
    background: #ffffff !important;
    -webkit-text-fill-color: #333333 !important;
    -webkit-appearance: menulist !important;
    -moz-appearance: menulist !important;
    appearance: menulist !important;
    line-height: 1.5 !important;
}

.modern-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    margin: 10px 0;
}

.modern-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.modern-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

.slider-value {
    display: inline-block;
    margin-left: 10px;
    padding: 4px 8px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 50px;
    text-align: center;
}

.color-input {
    width: 60px;
    height: 40px;
    padding: 0;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
}

.generate-section {
    text-align: center;
    margin: 40px 0;
}

.generate-btn-modern {
    display: inline-flex;
    align-items: center;
    gap: 15px;
    padding: 18px 40px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

.generate-btn-modern:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-icon {
    font-size: 1.3em;
}

.result-section {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    display: none;
}

.result-section.show {
    display: block;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.result-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.edit-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--warning-gradient);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.edit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 30px;
    align-items: start;
}

.qr-preview-modern {
    text-align: center;
}

#qrCodeContainer {
    display: inline-block;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: 20px;
}

.qr-with-styling {
    display: inline-block;
    text-align: center;
}

.qr-frame {
    display: inline-block;
    position: relative;
}

.qr-frame.simple {
    border: 3px solid #333;
}

.qr-frame.rounded {
    border: 3px solid #333;
    border-radius: 15px;
}

.qr-frame.dashed {
    border: 3px dashed #333;
}

.qr-frame.double {
    border: 6px double #333;
}

.qr-label {
    display: block;
    font-weight: 600;
    text-align: center;
    padding: 8px 12px;
    margin: 0 auto;
    border-radius: 6px;
    max-width: fit-content;
}

.qr-label.top {
    margin-bottom: 10px;
}

.qr-label.bottom {
    margin-top: 10px;
}

.preview-info {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    min-width: 200px;
}

.preview-info h4 {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.info-value {
    font-weight: 700;
    color: var(--text-primary);
}

.download-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

.download-section h4 {
    margin-bottom: 20px;
    margin-top: 0;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.download-btn-modern {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 15px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
    text-align: center;
}

.download-btn-modern:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: #667eea;
}

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

.download-text {
    font-weight: 700;
    font-size: 1rem;
}

.download-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    z-index: 9999;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    max-width: 300px;
    word-wrap: break-word;
    box-shadow: var(--shadow-lg);
}

.notification-success { background-color: #48bb78; }
.notification-error { background-color: #f56565; }
.notification-warning { background-color: #ed8936; }
.notification-info { background-color: #4299e1; }

.notification.show {
    transform: translateX(0);
}

/* TABLET RESPONSIVE */
@media (max-width: 1024px) {
    .qr-content {
        padding: 30px;
    }
    
    .form-section {
        padding: 25px;
    }
    
    .qr-header h1 {
        font-size: 2.2rem;
    }
}

/* MOBILE RESPONSIVE - TABLETS */
@media (max-width: 768px) {
    .qr-generator-container {
        margin: 15px;
    }
    
    .qr-content {
        padding: 20px;
    }
    
    .form-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .qr-header {
        padding: 30px 20px;
    }
    
    .qr-header h1 {
        font-size: 2rem;
    }
    
    /* TEMPLATE GRID: 2 COLUMNS ON TABLET */
    .template-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .template-btn {
        padding: 18px 12px;
        font-size: 0.85rem;
    }
    
    .template-icon {
        font-size: 1.8rem;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-header {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }
    
    .edit-btn {
        justify-content: center;
    }
    
    .notification {
        right: 15px;
        left: 15px;
        max-width: none;
    }
}

/* MOBILE RESPONSIVE - PHONES */
@media (max-width: 480px) {
    .qr-generator-container {
        margin: 10px;
        border-radius: 15px;
    }
    
    .qr-content {
        padding: 15px;
    }
    
    .form-section {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .qr-header {
        padding: 25px 15px;
    }
    
    .qr-header h1 {
        font-size: 1.8rem;
    }
    
    .qr-header p {
        font-size: 1rem;
    }
    
    /* TEMPLATE GRID: 2 COLUMNS ON MOBILE */
    .template-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .template-btn {
        padding: 15px 8px;
        font-size: 0.8rem;
    }
    
    .template-icon {
        font-size: 1.6rem;
    }
    
    .generate-btn-modern {
        padding: 15px 30px;
        font-size: 1rem;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .modern-input, .modern-select {
        padding: 12px 15px;
        font-size: 16px;
    }
    
    .notification {
        right: 10px;
        left: 10px;
        font-size: 0.9rem;
    }
}

/* EXTRA SMALL MOBILE */
@media (max-width: 360px) {
    .qr-header h1 {
        font-size: 1.6rem;
    }
    
    .template-btn {
        padding: 12px 6px;
        font-size: 0.75rem;
    }
    
    .template-icon {
        font-size: 1.4rem;
    }
    
    .generate-btn-modern {
        padding: 12px 25px;
        font-size: 0.95rem;
    }
}