:root {
    --ink: #1a1a1a;
    --muted: #6b6b6b;
    --border: #dcdcdc;
    --bg: #fafafa;
    --accent: #2563eb;
    --accent-ink: #ffffff;
    --error: #b42318;
    --error-bg: #fef3f2;
    --success: #067647;
    --success-bg: #ecfdf3;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
}

.page {
    max-width: 1080px;
    margin: 0 auto;
    padding: 32px 20px 64px;
}

.page-narrow {
    max-width: 520px;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.muted {
    color: var(--muted);
}

.small {
    font-size: 0.85rem;
}

.layout {
    display: grid;
    grid-template-columns: minmax(280px, 380px) 1fr;
    gap: 32px;
    margin-top: 24px;
}

@media (max-width: 720px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

fieldset {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin: 0 0 16px;
}

legend {
    padding: 0 6px;
    font-weight: 600;
    font-size: 0.85rem;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin: 12px 0 4px;
}

label:first-child {
    margin-top: 0;
}

input[type="text"],
input[type="url"],
select {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    background: #fff;
}

input[type="color"] {
    width: 100%;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2px;
    background: #fff;
}

input[type="file"] {
    width: 100%;
    font-size: 0.85rem;
}

.style-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

button,
.btn {
    display: inline-block;
    background: var(--accent);
    color: var(--accent-ink);
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}

button:hover,
.btn:hover {
    opacity: 0.9;
}

button.secondary,
.btn.secondary {
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--border);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.preview-panel {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

#qr-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

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

.result-box {
    width: 100%;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 8px;
}

.code-box {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    background: #f2f2f2;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    word-break: break-all;
    font-size: 0.9rem;
}

.field-static {
    margin-bottom: 16px;
}

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    margin: 12px 0;
}

.alert-error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error);
}

.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success);
}

.alert-warning {
    background: #fffaeb;
    color: #93370d;
    border: 1px solid #93370d;
}