:root {
    --primary-color: #2196F3;
    --hover-color: #1976D2;
    --background: #f5f5f5;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background: var(--background);
    margin: 0;
    padding: 0;
}

.navigation-button {
    display: inline-block;
    height: 40px;
    line-height: 40px;
    padding: 0 20px;
    background-color: #32CD32;
    color: white;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

.navigation-button:hover {
    background-color: #005f73;
}

.container {
    max-width: 1000px;
    margin: 20px auto;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: 2px dashed transparent;
    transition: all 0.3s ease;
}

.container.dragover {
    border-color: var(--primary-color);
    background: #f8f9fa;
}

.input-group {
    margin-bottom: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.upload-btn {
    position: relative;
    overflow: hidden;
    display: inline-block;
    transition: transform 0.2s;
}

.upload-btn:hover {
    transform: translateY(-2px);
}

.upload-btn input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.upload-hint {
    font-size: 0.9em;
    color: #666;
    margin-top: 8px;
    width: 100%;
}

textarea {
    width: 97%;
    height: 300px;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    resize: vertical;
    margin: 10px 0;
    font-size: 0.89em;
    font-family: monospace;
    transition: border-color 0.3s;
}

textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

button:hover {
    background: var(--hover-color);
    transform: translateY(-1px);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

#preview {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(188px, 1fr));
    gap: 20px;
    margin-top: 30px;
    padding: 20px 0;
    border-top: 2px solid #eee;
}

.qr-item {
    text-align: center;
    padding: 10px;
    background: #f8f8f8;
    border-radius: 8px;
    transition: transform 0.2s;
}

.qr-item:hover {
    transform: translateY(-3px);
}

.qr-item img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    cursor: pointer;
}

.qr-item button {
    margin: 10px auto;
    display: block;
}

.file-name {
    margin: 10px 0;
    color: #666;
    font-size: 0.9em;
}

.status {
    padding: 10px;
    margin: 10px 0;
    background: #e3f2fd;
    border-radius: 6px;
    color: #0d47a1;
    transition: opacity 0.3s;
}

.drag-hint {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px dashed var(--primary-color);
    color: var(--primary-color);
    font-weight: bold;
    pointer-events: none;
}

.drop-zone {
    border: 2px dashed var(--primary-color);
    padding: 40px;
    text-align: center;
    border-radius: 12px;
    background: #f8f9fa;
    transition: border-color 0.3s, background-color 0.3s;
    margin-bottom: 20px;
}

.drop-zone.dragover {
    border-color: var(--hover-color);
    background: #e3f2fd;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    margin: auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px;
    border-radius: 8px;
    text-align: center;
    overflow: hidden;
}

.modal-content img {
    width: 100%;
    height: auto;
    transition: transform 0.2s;
}

.modal-content button {
    margin: 10px auto;
    display: block;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

.clear-btn {
    margin-left: auto;
}

header, footer {
    width: 100%;
    box-sizing: border-box;
    position: relative;
    left: 0;
    right: 0;
}

header {
    background-color: #007bff;
    color: #fff;
    padding: 15px 0;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2em;
}

header h2 {
    font-size: 1em;
    margin: 5px 0 0;
}

header a {
    color: #ffd700;
    text-decoration: none;
}

footer {
    text-align: center;
    padding: 15px;
    background-color: #007bff;
    color: #fff;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 10px;
    }

    .input-group {
        flex-direction: column;
        gap: 10px;
    }

    textarea {
        width: 100%;
    }
}