.drop-zone,
.image-card {
    position: relative;
    display: flex;
    background-color: #fff
}

.drop-zone,
.max-size-controls {
    margin-bottom: 8px;
    max-width: 800px
}

.atlas-canvas,
.drop-zone,
.image-card {
    background-color: #fff
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    padding: 16px;
    background-color: #f8fafc;
    color: #334155;
    line-height: 1.5
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 0 0 16px;
    color: #1e293b
}

.drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    min-height: 200px;
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
    padding: 32px;
    transition: border-color .2s
}

.drop-zone:hover {
    border-color: #64748b
}

.drop-zone:empty::before {
    content: 'Drop images here';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #94a3b8;
    font-size: 1.125rem;
    font-weight: 500
}

.image-card {
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    margin: 8px;
    padding: 8px;
    width: 140px;
    height: 200px;
    flex-direction: column;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .1);
    transition: box-shadow .2s
}

.image-card:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, .1)
}

.image-preview {
    width: 100%;
    height: 60%;
    object-fit: fill;
    border: 1px solid #f1f5f9;
    border-radius: 4px
}

.card-inputs {
    flex: 1;
    display: flex;
    flex-direction: column;
    font-size: .875rem;
    padding-top: 8px
}

.max-size-controls,
.toolbar {
    padding: 8px 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .1)
}

.card-inputs input {
    margin: 4px 0;
    padding: 4px;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-size: .875rem
}

.size-inputs {
    display: flex;
    align-items: center
}

.max-size-controls,
.remove-btn {
    align-items: center;
    background: #fff;
    display: flex
}

.save-options label,
.size-inputs label {
    margin-right: 4px;
    font-weight: 500;
    color: #475569
}

.size-inputs input {
    width: 45px;
    margin-right: 8px
}

.remove-btn {
    cursor: pointer;
    color: #ef4444;
    font-weight: 700;
    font-size: 1rem;
    position: absolute;
    top: 4px;
    right: 4px;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    justify-content: center;
    border: 1px solid #e2e8f0
}

.remove-btn:hover {
    background: #fee2e2
}

.max-size-controls {
    border-radius: 6px;
    width: 100%
}

.max-size-controls label {
    margin-right: 8px;
    font-weight: 500;
    color: #475569
}

.atlas-canvas {
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    max-width: 100%;
    max-height: 40vh;
    margin-bottom: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .1)
}

.errors,
.output-section,
.save-controls,
.toolbar {
    width: 100%;
    max-width: 800px
}

.canvas-size {
    font-size: .875rem;
    margin-bottom: 16px;
    color: #64748b;
    font-weight: 500
}

.clear-btn,
.toolbar label {
    color: #475569;
    font-weight: 500
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 8px;
    background: #fff;
    border-radius: 6px;
    flex-wrap: wrap
}

.toolbar label {
    margin-right: 4px;
    white-space: nowrap
}

.toolbar input,
.toolbar select {
    padding: 4px 8px;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-size: .875rem
}

.clear-btn {
    margin-left: auto;
    padding: 6px 12px;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    cursor: pointer
}

.clear-btn:hover {
    background: #e2e8f0
}

.output-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start
}

.output-textarea {
    width: 100%;
    height: 180px;
    font-family: 'Courier New', monospace;
    font-size: .875rem;
    padding: 12px;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    resize: vertical;
    background: #f8fafc;
    margin-top: 4px
}

.save-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 8px 0;
    padding: 8px 16px;
    background: #fff;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .1)
}

.copy-btn {
    padding: 6px 16px;
    background: #3b82f6;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500
}

.copy-btn:hover {
    background: #2563eb
}

.save-options {
    display: flex;
    align-items: center;
    gap: 12px
}

.save-btn,
.save-options select {
    padding: 6px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    font-weight: 500
}

.save-btn {
    background: #10b981;
    color: #fff;
    border: none
}

.save-btn:hover {
    background: #059669
}

.errors {
    color: #dc2626;
    min-height: 20px;
    padding: 8px 16px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 6px;
    font-size: .875rem;
    margin-bottom: 16px
}

footer {
    margin-top: 40px;
    padding: 20px;
    text-align: center;
    border-top: 1px solid #ddd;
    font-size: 0.9rem;
    color: #666;
}