body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #f4f7fb;
}

.qr-wrapper {
    padding: 30px 15px;
}

.qr-container {
    max-width: 950px;
    margin: auto;
    background: #ffffff;
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.10);
}

h1, h2 {
    margin-bottom: 20px;
    color: #222;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.form-group.half {
    flex: 1;
    min-width: 240px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #222;
}

textarea,
select,
input[type="file"],
input[type="color"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #cfcfcf;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 14px;
    background: #fff;
}

textarea {
    resize: vertical;
    min-height: 140px;
}

input[type="color"] {
    height: 50px;
    padding: 6px;
    cursor: pointer;
}

.help-text {
    display: block;
    margin-top: 8px;
    color: #666;
    font-size: 13px;
}

.btn-group {
    text-align: center;
    margin-top: 25px;
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.generate-btn,
.clear-btn,
.download-btn,
.png-btn,
.copy-btn {
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 15px;
}

.generate-btn {
    background: #007bff;
}

.generate-btn:hover {
    background: #0056b3;
}

.clear-btn {
    background: #6c757d;
}

.clear-btn:hover {
    background: #545b62;
}

.download-btn {
    background: #28a745;
}

.download-btn:hover {
    background: #1f8a38;
}

.png-btn {
    background: #fd7e14;
}

.png-btn:hover {
    background: #dc6803;
}

.copy-btn {
    background: #20c997;
}

.copy-btn:hover {
    background: #18a77d;
}

.result-box {
    margin-top: 35px;
    text-align: center;
    padding: 25px;
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    background: #fafafa;
    transition: all 0.4s ease;
}

.hidden {
    display: none;
}

.qr-preview {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    min-height: 280px;
    background: #fff;
    border-radius: 12px;
    border: 1px dashed #d9d9d9;
    padding: 20px;
    overflow: auto;
}

.qr-preview canvas,
.qr-preview img,
.qr-preview svg {
    max-width: 100%;
    height: auto;
}

.preview-text {
    margin-top: 25px;
    text-align: left;
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ddd;
    word-break: break-word;
}

.copy-message {
    display: none;
    margin-top: 15px;
    font-weight: bold;
    text-align: center;
    padding: 10px 14px;
    border-radius: 8px;
}

.copy-message.success {
    color: #198754;
    background: #e9f9ef;
}

.copy-message.error-msg {
    color: #b42318;
    background: #fef3f2;
}

.error {
    color: #d92d20;
    margin-top: 6px;
    font-size: 13px;
}

.qr-highlight {
    animation: qrGlow 2s ease;
}

@keyframes qrGlow {
    0% {
        box-shadow: 0 0 0 rgba(40, 167, 69, 0);
        transform: scale(1);
    }
    25% {
        box-shadow: 0 0 0 4px rgba(40, 167, 69, 0.18);
        transform: scale(1.01);
    }
    50% {
        box-shadow: 0 0 18px 6px rgba(40, 167, 69, 0.22);
        transform: scale(1.015);
    }
    100% {
        box-shadow: 0 0 0 rgba(40, 167, 69, 0);
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .qr-container {
        padding: 20px;
    }

    .btn-group {
        flex-direction: column;
    }

    .generate-btn,
    .clear-btn,
    .download-btn,
    .png-btn,
    .copy-btn {
        width: 100%;
    }
}