* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, sans-serif;
}

:root {
    --bg-topbar: #1e1f22;
    --bg-sidebar: #111214;
    --bg-panel: #2b2d31;
    --bg-workspace: #0f1012;
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --text-color: #f2f3f5;
    --text-muted: #94a3b8;
    --border-color: #3f4248;
    --success: #10b981;
}

body {
    background-color: var(--bg-workspace);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.topbar {
    height: 60px;
    background-color: var(--bg-topbar);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo i { color: var(--accent-color); }
.logo small { background: var(--accent-color); font-size: 0.65rem; padding: 2px 6px; border-radius: 4px; text-transform: uppercase; }

.export-options { display: flex; align-items: center; gap: 15px; }
.select-wrapper { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: var(--text-muted); }
.select-wrapper select { background: #313338; color: white; border: 1px solid var(--border-color); padding: 6px 12px; border-radius: 6px; cursor: pointer; }

.app-body { flex: 1; display: flex; overflow: hidden; }
.sidebar { width: 80px; background-color: var(--bg-sidebar); display: flex; flex-direction: column; align-items: center; padding-top: 15px; gap: 10px; }
.sidebar-tab { width: 68px; height: 68px; border-radius: 8px; display: flex; flex-direction: column; justify-content: center; align-items: center; font-size: 0.75rem; color: var(--text-muted); cursor: pointer; transition: all 0.2s ease; gap: 6px; }
.sidebar-tab i { font-size: 1.25rem; }
.sidebar-tab:hover, .sidebar-tab.active { color: white; background-color: var(--bg-panel); }
.sidebar-tab.active i { color: var(--accent-color); }

.panel-content { width: 320px; background-color: var(--bg-panel); border-right: 1px solid var(--border-color); padding: 20px; display: flex; flex-direction: column; gap: 20px; overflow-y: auto; }
.tab-panel { display: none; flex-direction: column; gap: 18px; }
.tab-panel.active { display: flex; }
.tab-panel h3 { font-size: 1.1rem; font-weight: 600; }
.panel-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.4; }

.drop-zone { border: 2px dashed #4f5157; border-radius: 8px; padding: 40px 15px; text-align: center; background: #313338; cursor: pointer; transition: border 0.2s; }
.drop-zone:hover { border-color: var(--accent-color); }
.drop-zone i { font-size: 2.5rem; color: var(--accent-color); margin-bottom: 10px; }
.drop-zone p { font-size: 0.85rem; color: var(--text-color); }

.file-info { background: #1e1f22; padding: 12px; border-radius: 6px; display: flex; flex-direction: column; gap: 10px; }
#fileName { font-size: 0.85rem; word-break: break-all; }

.method-selector { display: flex; flex-direction: column; gap: 10px; }
.radio-label { display: flex; align-items: center; gap: 10px; background: #313338; padding: 12px; border-radius: 6px; cursor: pointer; font-size: 0.88rem; border: 1px solid transparent; }
.radio-label:has(input:checked) { border-color: var(--accent-color); background: rgba(139, 92, 246, 0.08); }

.api-key-box { display: flex; flex-direction: column; gap: 6px; }
.api-key-box label { font-size: 0.8rem; color: var(--text-muted); }
.api-key-box input { background: #1e1f22; border: 1px solid var(--border-color); color: white; padding: 10px; border-radius: 6px; outline: none; }
.api-key-box small a { color: var(--accent-color); text-decoration: none; }

.color-picker-wrapper { display: flex; align-items: center; gap: 12px; margin-top: 6px; }
#bgColorPicker { -webkit-appearance: none; width: 45px; height: 45px; background-color: transparent; border: none; cursor: pointer; }
#bgColorPicker::-webkit-color-swatch { border-radius: 50%; border: 2px solid var(--border-color); }

.range-group { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; font-size: 0.85rem; }
.range-group input[type="range"] { accent-color: var(--accent-color); cursor: pointer; }

.workspace { flex: 1; background-color: var(--bg-workspace); display: flex; justify-content: center; align-items: center; padding: 30px; position: relative; overflow: auto; }
.canvas-container { position: relative; box-shadow: 0 20px 50px rgba(0,0,0,0.5); border-radius: 4px; }
.canvas-board { position: relative; width: 500px; height: 500px; background-color: white; overflow: hidden; display: flex; justify-content: center; align-items: center; }

.transparent-grid {
    background-image: linear-gradient(45deg, #e0e0e0 25%, transparent 25%), 
                      linear-gradient(-45deg, #e0e0e0 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #e0e0e0 75%), 
                      linear-gradient(-45deg, transparent 75%, #e0e0e0 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.canvas-bg-layer { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.canvas-fg-layer { position: relative; z-index: 2; max-width: 90%; max-height: 90%; object-fit: contain; transition: transform 0.1s ease; }

.btn { padding: 10px 16px; font-size: 0.9rem; font-weight: 600; border-radius: 6px; border: none; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px; transition: background 0.2s; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent-color); color: white; width: 100%; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: #ef4444; color: white; }
.btn-secondary { background: #313338; color: white; border: 1px solid var(--border-color); }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }

.global-loader { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(17, 18, 20, 0.9); z-index: 20; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 12px; border-radius: 4px; text-align: center; padding: 20px; }
.spinner { width: 40px; height: 40px; border: 3px solid #3f4248; border-top: 3px solid var(--accent-color); border-radius: 50%; animation: spin-anim 0.8s linear infinite; }
@keyframes spin-anim { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
#loaderDesc { font-size: 0.8rem; color: var(--text-muted); }
.hidden { display: none !important; }