* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    background: #f2f2f2;
    color: #222;
    padding: 2rem 1rem;
}

main {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    max-width: 480px;
    width: 100%;
    padding: 1.5rem;
}

header {
    text-align: center;
    margin-bottom: 1.5rem;
}

h1 {
    margin-bottom: 0.5rem;
    font-size: 1.6rem;
}

header p {
    color: #666;
    line-height: 1.4;
    font-size: 0.95rem;
}
 
.tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.tab {
    flex: 1;
    padding: 0.5rem;
    background: #f2f2f2;
    color: #555;
    border: 1px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
}

.tab.active {
    background: #c0392b;
    color: #fff;
    border-color: #c0392b;
}

.tab-panel form {
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    flex: 1;
    padding: 0.55rem 0.7rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 1rem;
}

input[type="file"] {
    width: 100%;
    font-size: 0.95rem;
}

button {
    padding: 0.55rem 1rem;
    border: none;
    border-radius: 6px;
    background: #c0392b;
    color: #fff;
    cursor: pointer;
    font-size: 1rem;
}

button:hover {
    background: #a93226;
}

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

.hint {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: #888;
}

.status {
    min-height: 1.2rem;
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: #c0392b;
} 

.hidden {
    display: none;
}

.editor {
    margin-top: 1.5rem;
    border-top: 1px solid #eee;
    padding-top: 1.5rem;
    text-align: center;
}

.canvas-wrap {
    display: inline-block;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
}

canvas {
    display: block;
    width: 240px;
    height: 240px;
}

.display-name {
    margin: 0.75rem 0;
    font-weight: 600;
}

.tools {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

fieldset {
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    padding: 0.5rem 0.75rem 0.75rem;
}

legend {
    padding: 0 0.4rem;
    font-weight: 600;
    font-size: 0.95rem;
}

legend label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}

.slider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: #555;
    margin-top: 0.4rem;
}

.slider input[type="range"] {
    flex: 1;
}

#autoBtn {
    background: #2c3e50;
    align-self: center;
}

#autoBtn:hover {
    background: #1f2d3a;
}

#downloadBtn {
    background: #27632f;
    align-self: center;
}

#downloadBtn:hover {
    background: #1e4d24;
}