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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #202124;
    color: #f5f5f5;
    padding: 16px;
}

header {
    margin-bottom: 16px;
}

header h1 {
    font-size: 1.6rem;
    margin-bottom: 4px;
}

header p {
    font-size: 0.95rem;
    color: #cccccc;
}

.controls,
.channel-settings,
.export-settings {
    background: #2b2d31;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.control-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.control-group label {
    font-size: 0.9rem;
}

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

select,
input[type="number"],
input[type="text"],
textarea {
    background: #1f1f21;
    color: #f5f5f5;
    border: 1px solid #444;
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 0.9rem;
}

textarea {
    width: 100%;
    resize: vertical;
}

input[type="radio"] {
    margin-right: 4px;
}

.channel-settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}

.channel-card {
    background: #1f2023;
    border-radius: 8px;
    padding: 10px;
}

.channel-card h2 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    margin-bottom: 6px;
}

.control-row span {
    font-size: 0.85rem;
}

.export-settings h2 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.export-settings h3 {
    font-size: 0.95rem;
}

.export-buttons {
    justify-content: flex-start;
    margin-top: 4px;
}

button {
    background: #4b8bf5;
    border: none;
    border-radius: 4px;
    padding: 6px 10px;
    font-size: 0.9rem;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #3a73d8;
}

.hint {
    font-size: 0.85rem;
    color: #cccccc;
}

main {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.canvas-block {
    background: #18191b;
    border-radius: 8px;
    padding: 8px;
}

.canvas-title {
    font-size: 0.9rem;
    margin-bottom: 4px;
    color: #cccccc;
}

canvas {
    width: 100%;
    height: 220px;
    display: block;
    border-radius: 4px;
    background: #333;
}

footer {
    margin-top: 16px;
    font-size: 0.75rem;
    color: #aaaaaa;
}