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

html, body { height: 100%; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }

.page { height: 100vh; display: flex; flex-direction: column; }

.playground { display: flex; flex-direction: column; height: 100vh; background: #1e1e2e; color: #cdd6f4; }

/* Toolbar */
.toolbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 16px; background: #181825; border-bottom: 1px solid #313244;
}
.toolbar h1 { font-size: 16px; font-weight: 600; color: #cba6f7; }
.toolbar-left { display: flex; align-items: center; gap: 10px; }
.toolbar-actions { display: flex; align-items: center; gap: 10px; }
.github-link { color: #6c7086; transition: color 0.15s; display: flex; align-items: center; }
.github-link:hover { color: #cdd6f4; }
.toolbar select {
    background: #313244; color: #cdd6f4; border: 1px solid #45475a;
    padding: 6px 10px; border-radius: 6px; font-size: 13px;
}
.btn {
    padding: 6px 16px; border: 1px solid #45475a; border-radius: 6px;
    background: #313244; color: #cdd6f4; cursor: pointer; font-size: 13px;
    transition: background 0.15s;
}
.btn:hover { background: #45475a; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: #6C5CE7; border-color: #6C5CE7; color: white; }
.btn-primary:hover { background: #5a4bd1; }
.toggle { display: flex; align-items: center; gap: 6px; font-size: 13px; cursor: pointer; }
.toggle input { cursor: pointer; }

/* Editor + Preview */
.editor-preview { display: flex; flex: 1; min-height: 0; }
.editor-pane { flex: 1; display: flex; flex-direction: column; border-right: 1px solid #313244; }
.editor-tabs {
    display: flex; background: #181825; border-bottom: 1px solid #313244;
}
.editor-tab {
    padding: 6px 16px; font-size: 13px; color: #6c7086; cursor: pointer;
    border: none; background: none; border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}
.editor-tab:hover { color: #cdd6f4; }
.editor-tab.active { color: #cba6f7; border-bottom-color: #cba6f7; }
.editor-pane textarea {
    flex: 1; width: 100%; resize: none; border: none; outline: none;
    background: #1e1e2e; color: #cdd6f4; padding: 16px;
    font-family: 'Consolas', 'Fira Code', 'Courier New', monospace;
    font-size: 14px; line-height: 1.5; tab-size: 2;
}
.html-preview-frame {
    flex: 1; width: 100%; border: none; background: #e0e0e0;
}
.preview-pane {
    flex: 1; overflow: auto; background: #e8e8e8; display: flex;
    flex-direction: column; align-items: center; padding: 16px;
}
#pdfPages { display: flex; flex-direction: column; align-items: center; }
.preview-pane img { max-width: 100%; height: auto; box-shadow: 0 2px 12px rgba(0,0,0,0.15); }
.preview-pane .placeholder {
    color: #999; font-size: 14px; margin-top: 80px;
}
.preview-pane .loading {
    color: #6C5CE7; font-size: 14px; margin-top: 80px;
}
.preview-pane .error {
    color: #e74c3c; background: #fff5f5; border: 1px solid #fcc; border-radius: 8px;
    padding: 16px; margin: 16px; font-size: 13px; white-space: pre-wrap;
    font-family: monospace; max-width: 100%;
}

/* Status bar */
.status-bar {
    padding: 4px 16px; background: #181825; border-top: 1px solid #313244;
    font-size: 12px; color: #6c7086;
}

/* Responsive */
@media (max-width: 768px) {
    .editor-preview { flex-direction: column; }
    .editor-pane { border-right: none; border-bottom: 1px solid #313244; min-height: 40vh; }
}