body {
    background: #f5f7fb;
}

/* Overall layout */
.bct-layout {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: #f5f7fb;
    font-family: -apple-system, BlinkMacSystemFont,
                 "Segoe UI", Roboto, sans-serif;
}

/* Sidebar */
.bct-sidebar {
    width: 33%;
    background: #e9edf3;
    padding: 20px;
    border-radius: 10px;
}

/* Main area */
.bct-main {
    width: 67%;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    min-height: 500px;
}

/* Titles */
.bct-title {
    font-size: 22px;
    margin-bottom: 20px;
}

.bct-chart-title {
    text-align: center;
    margin-bottom: 20px;
}

/* Form */
.bct-item {
    margin-bottom: 18px;
}

.bct-item label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

/* Inputs */
.bct-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #fff;
    font-size: 14px;
}

textarea.bct-input {
    height: 100px;
    resize: vertical;
}

/* Chart area */
.bct-chart-wrap {
    position: relative;
    height: 450px;
}

.bct-chart {
    position: absolute;
    width: 100% !important;
    height: 100% !important;
}

/* Buttons */
.bct-buttons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.bct-generate,
.bct-download {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: #fff;
    font-size: 14px;
    transition: .2s;
}

.bct-generate {
    background: #2563eb;
}

.bct-download {
    background: #16a34a;
}

.bct-generate:hover,
.bct-download:hover {
    opacity: .9;
}

/* Color picker */
.bct-color-picker {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.bct-color-item {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: .2s;
}

.bct-color-item:hover {
    transform: scale(1.1);
}

.bct-color-item.active {
    border-color: #111;
}