body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background-color: #f4f4f4;
    margin: 0;
}

.container {
    background-color: white;
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 900px;
    width: 92%;
    border: 2px dashed transparent;
    transition: border-color 0.3s, background-color 0.3s;
}

.container.dragover {
    border-color: #007aff;
    background-color: #f0f8ff;
}

h1 {
    text-align: center;
    margin-top: 8px;
    font-size: 1.4em;
}

.navigation-links {
    margin-bottom: 8px;
    font-size: 0.9em;
}

.navigation-links a {
    color: #007aff;
    text-decoration: none;
}

.navigation-links a:hover {
    text-decoration: underline;
}

details summary {
    cursor: pointer;
    font-weight: bold;
}

details ol {
    padding-left: 1.5em;
    line-height: 1.7;
}

.upload-area {
    border: 2px dashed #bbb;
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    margin: 16px 0;
    background: #fafafa;
}

.upload-area p {
    margin: 8px 0 0;
    color: #666;
    font-size: 0.9em;
}

.controls {
    margin: 12px 0 20px;
    padding: 14px;
    background: #f7f7f7;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.control-row .control-label {
    font-weight: bold;
}

.control-row label {
    font-size: 0.95em;
}

.control-row select,
.control-row input[type="color"] {
    margin-left: 4px;
}

button {
    padding: 8px 14px;
    cursor: pointer;
    border: none;
    border-radius: 6px;
    background-color: #007aff;
    color: white;
    font-size: 0.9em;
    transition: background-color 0.2s;
}

button:hover:not(:disabled) {
    background-color: #005bbf;
}

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

button.swatch {
    padding: 4px 10px;
    font-size: 0.8em;
    background-color: #888;
}

button.swatch:hover:not(:disabled) {
    background-color: #666;
}

input[type="color"] {
    width: 36px;
    height: 28px;
    border: 1px solid #ccc;
    padding: 0;
    vertical-align: middle;
    border-radius: 4px;
}

input[type="color"]:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

select {
    padding: 4px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: white;
    font-size: 0.9em;
}

.source-heading {
    font-size: 0.9em;
    color: #555;
    font-weight: bold;
    margin: 4px 0 10px;
}

.source-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
}

.source-item {
    border: 1px solid #e3e3e3;
    border-radius: 8px;
    padding: 8px;
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    text-align: center;
}

.image-thumb {
    width: 100%;
    height: 72px;
    object-fit: contain;
    border-radius: 4px;
    background: #f0f0f0;
    border: 1px solid #ddd;
}

.source-item .name {
    font-size: 0.78em;
    word-break: break-all;
    line-height: 1.3;
    color: #444;
}

.source-item .remove {
    background: #d33;
    padding: 4px 10px;
    font-size: 0.78em;
    width: 100%;
}

.source-item .remove:hover:not(:disabled) {
    background: #a22;
}

.preview-section {
    margin-bottom: 18px;
}

.preview {
    background-image:
            linear-gradient(45deg, #ddd 25%, transparent 25%),
            linear-gradient(-45deg, #ddd 25%, transparent 25%),
            linear-gradient(45deg, transparent 75%, #ddd 75%),
            linear-gradient(-45deg, transparent 75%, #ddd 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    border-radius: 4px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.preview canvas {
    max-width: 100%;
    height: auto;
    display: block;
}

.preview-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.preview-footer .px {
    color: #666;
    font-size: 0.85em;
}

.preview-footer .download-one {
    background-color: #34c759;
    font-size: 0.9em;
}

.preview-footer .download-one:hover:not(:disabled) {
    background-color: #28a745;
}

/* ===== theme (skin) overrides — token 駆動・常時適用（var は /css/theme.css 由来） ===== */
body { background-color: var(--color-bg-base); color: var(--color-fg-primary); }
.container { background-color: var(--color-bg-surface); box-shadow: 0 0 12px rgba(0, 0, 0, 0.4); }
.container.dragover { background-color: var(--color-bg-elevated); }
.navigation-links a { color: var(--color-accent); }
.upload-area { background: var(--color-bg-elevated); border-color: var(--color-border-base); }
.upload-area p { color: var(--color-fg-muted); }
.controls { background: var(--color-bg-elevated); }
select { background: var(--color-bg-elevated); color: var(--color-fg-primary); border-color: var(--color-border-base); }
input[type="color"] { border-color: var(--color-border-base); }
button { background-color: var(--color-accent); color: var(--color-accent-fg); }
button:hover:not(:disabled) { background-color: var(--color-accent); filter: brightness(1.12); }
.source-heading { color: var(--color-fg-muted); }
.source-item { background: var(--color-bg-surface); border-color: var(--color-border-subtle); }
.source-item .name { color: var(--color-fg-muted); }
.image-thumb { background: var(--color-bg-base); border-color: var(--color-border-base); }
.preview-footer .px { color: var(--color-fg-muted); }
.preview {
    background-image:
            linear-gradient(45deg, var(--color-border-subtle) 25%, transparent 25%),
            linear-gradient(-45deg, var(--color-border-subtle) 25%, transparent 25%),
            linear-gradient(45deg, transparent 75%, var(--color-border-subtle) 75%),
            linear-gradient(-45deg, transparent 75%, var(--color-border-subtle) 75%);
}