:root {
    --primary-color: #2563eb;
    --hover-color: #1d4ed8;
    --bg-color: #f8fafc;
    --panel-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #1e293b;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 2rem;
    margin: 0;
}

.container {
    background: var(--panel-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    width: 100%;
    max-width: 500px;
}

h1 {
    margin-top: 0;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

p {
    color: #64748b;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    resize: vertical;
    font-family: inherit;
}

.settings-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.color-picker-group {
    flex: 1;
}

.color-control {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.color-control input[type="color"] {
    width: 45px;
    height: 40px;
    padding: 2px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.color-control input[type="text"] {
    flex: 1;
    height: 40px;
    padding: 0 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: monospace;
    font-size: 1rem;
    box-sizing: border-box;
    text-transform: uppercase;
}

.color-control input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #f1f5f9;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

button {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: var(--hover-color);
}

.output-panel {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.qr-preview {
    width: 250px;
    height: 250px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: transparent;
    overflow: hidden;
}

.qr-preview svg {
    width: 100%;
    height: 100%;
}

.placeholder-text {
    color: #94a3b8;
    font-size: 0.85rem;
    text-align: center;
    padding: 1rem;
}

#download-btn {
    background-color: #10b981;
}

#download-btn:hover {
    background-color: #059669;
}