.builder-layout {
    display: flex;
    height: calc(100vh - 60px);
    overflow: hidden;
}

.builder-sidebar {
    width: 320px;
    min-width: 320px;
    background: var(--clr-surface);
    border-right: 1px solid var(--clr-border);
    padding: 1.2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.sb-section { margin-bottom: 0.6rem; }
.sb-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--clr-muted);
    margin-bottom: 0.3rem;
}
.sb-input, .sb-select {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1.5px solid var(--clr-border);
    border-radius: 6px;
    font-size: 0.9rem;
    background: var(--clr-bg);
    transition: border-color 0.2s;
}
.sb-input:focus, .sb-select:focus {
    outline: none;
    border-color: var(--clr-primary);
}
.sb-select { cursor: pointer; }

.style-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
}
.style-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    padding: 0.45rem 0.2rem;
    border: 2px solid var(--clr-border);
    border-radius: 8px;
    background: var(--clr-bg);
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 600;
    transition: all 0.2s;
    color: var(--clr-muted);
}
.style-btn .style-icon { font-size: 1.1rem; }
.style-btn:hover { border-color: var(--clr-primary); color: var(--clr-text); }
.style-btn.active {
    border-color: var(--clr-primary);
    background: var(--clr-primary);
    color: #fff;
}

.theme-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
}
.theme-swatch {
    aspect-ratio: 1;
    border-radius: 8px;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}
.theme-swatch::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 5px;
    opacity: 0;
    transition: opacity 0.2s;
}
.theme-swatch:hover { transform: scale(1.1); }
.theme-swatch.active {
    border-color: var(--clr-text);
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.theme-swatch .swatch-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    font-size: 0.55rem;
    text-align: center;
    color: #fff;
    background: rgba(0,0,0,0.5);
    padding: 1px 0;
    font-weight: 600;
}

.sb-divider {
    border: none;
    border-top: 1px solid var(--clr-border);
    margin: 0.5rem 0;
}

.sb-download {
    width: 100%;
    padding: 0.7rem;
    background: var(--clr-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: auto;
}
.sb-download:hover { background: var(--clr-primary-hover); }

.builder-preview {
    flex: 1;
    background: #e5e7eb;
    padding: 0;
    display: flex;
}
.builder-preview iframe {
    flex: 1;
    border: none;
    background: #fff;
}

@media (max-width: 900px) {
    .builder-layout { flex-direction: column; height: auto; }
    .builder-sidebar { width: 100%; min-width: 0; max-height: 50vh; }
    .builder-preview { min-height: 60vh; }
}