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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 40px;
}

@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: #555;
    font-size: 0.95em;
}

.form-group input[type="text"],
.form-group input[type="file"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s;
    background: white;
}

.form-group textarea {
    font-family: 'Courier New', monospace;
    line-height: 1.5;
}

.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="text"]:focus,
.form-group input[type="file"]:focus,
.form-group input[type="number"]:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group select {
    cursor: pointer;
}

.form-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
}

.form-group small {
    color: #888;
    font-size: 0.85em;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

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

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

.btn-secondary {
    background: #f0f0f0;
    color: #333;
    border: 2px solid #ddd;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin: 5px;
}

.btn-secondary:hover:not(:disabled) {
    background: #e0e0e0;
    border-color: #667eea;
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.output-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.qr-container {
    position: relative;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    display: inline-block;
}

#qrCanvas {
    max-width: 100%;
    height: auto;
    display: block;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

#watermarkOverlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.05;
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(0, 0, 0, 0.1) 10px,
        rgba(0, 0, 0, 0.1) 20px
    );
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

#statusMessage {
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.status-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.security-info {
    background: #f8f9fa;
    padding: 30px 40px;
    border-top: 2px solid #e0e0e0;
}

.security-info h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.security-info ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.security-info li {
    padding: 8px 0;
    color: #555;
}

.security-warning {
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
}

.security-warning strong {
    color: #856404;
    display: block;
    margin-bottom: 10px;
}

.security-warning ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.security-warning li {
    color: #856404;
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
}

.security-warning li:before {
    content: "•";
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Prevent image dragging and right-click */
.qr-container img,
#qrCanvas {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

/* Loading animation */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

/* Gradient options styling */
#gradientOptions {
    border: 2px solid #667eea;
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f2ff 100%);
}

#gradientOptions .form-group {
    margin-bottom: 15px;
}

#gradientOptions input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    cursor: pointer;
}

#gradientOptions input[type="range"] {
    width: 100%;
    accent-color: #667eea;
}