:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#0f172a;--bg-hover:#334155;--bg-active:#1e3a5f;--border:#334155;--border-hover:#3b82f6;--text-primary:#e2e8f0;--text-secondary:#94a3b8;--text-muted:#475569;--text-heading:#f1f5f9;--text-link:#60a5fa;--text-link-hover:#93c5fd;--accent:#3b82f6;--accent-hover:#2563eb;--gradient-start:#38bdf8;--gradient-end:#818cf8;--success:#22c55e;--success-bg:#052e16;--success-text:#86efac;--success-border:#166534;--danger:#ef4444;--danger-bg:#450a0a;--danger-text:#fca5a5;--danger-border:#7f1d1d;--warning:#f59e0b;--warning-bg:#1e1a05;--warning-text:#fbbf24;--warning-border:#7f6b10;--purple:#8b5cf6;--purple-hover:#7c3aed;--code-key:#818cf8;--code-string:#86efac;--code-number:#67e8f9;--code-bool:#fde68a;--code-null:#a78bfa;--shadow:#0000004d;--diff-removed-bg:#450a0a;--diff-added-bg:#052e16;--diff-modified-bg:#1e1a05}.light-theme{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--bg-hover:#e2e8f0;--bg-active:#dbeafe;--border:#e2e8f0;--border-hover:#3b82f6;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--text-heading:#0f172a;--text-link:#2563eb;--text-link-hover:#1d4ed8;--accent:#3b82f6;--accent-hover:#2563eb;--gradient-start:#3b82f6;--gradient-end:#7c3aed;--success:#16a34a;--success-bg:#f0fdf4;--success-text:#166534;--success-border:#bbf7d0;--danger:#dc2626;--danger-bg:#fef2f2;--danger-text:#991b1b;--danger-border:#fecaca;--warning:#d97706;--warning-bg:#fffbeb;--warning-text:#92400e;--warning-border:#fde68a;--purple:#7c3aed;--purple-hover:#6d28d9;--code-key:#7c3aed;--code-string:#059669;--code-number:#0891b2;--code-bool:#b45309;--code-null:#9333ea;--shadow:#0000001a;--diff-removed-bg:#fef2f2;--diff-added-bg:#f0fdf4;--diff-modified-bg:#fffbeb}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;transition:background .2s,color .2s}.container{max-width:1000px;margin:0 auto;padding:24px 16px}header{margin-bottom:24px}.header-top{justify-content:space-between;align-items:center;gap:12px;display:flex}header h1{background:linear-gradient(135deg, var(--gradient-start), var(--gradient-end));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:28px;font-weight:700}.subtitle{color:var(--text-secondary);margin-top:8px;font-size:14px}.theme-btn{background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-primary);cursor:pointer;border-radius:8px;padding:6px 10px;font-size:16px;line-height:1;transition:all .15s}.theme-btn:hover{background:var(--bg-hover)}.lang-switcher{position:relative}.lang-btn{background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-primary);cursor:pointer;white-space:nowrap;border-radius:8px;padding:6px 12px;font-size:13px;transition:all .15s}.lang-btn:hover{background:var(--bg-hover)}.lang-dropdown{background:var(--bg-secondary);border:1px solid var(--border);z-index:100;min-width:140px;box-shadow:0 8px 24px var(--shadow);border-radius:8px;margin-top:4px;position:absolute;top:100%;right:0;overflow:hidden}.lang-option{width:100%;color:var(--text-primary);cursor:pointer;text-align:left;background:0 0;border:none;padding:10px 14px;font-size:13px;transition:background .1s;display:block}.lang-option:hover{background:var(--bg-hover)}.lang-option.active{background:var(--bg-active);color:var(--accent)}.toast{border-radius:10px;align-items:center;gap:8px;margin-bottom:12px;padding:10px 16px;font-size:14px;font-weight:500;display:none}.toast.show{display:flex}.toast.success{background:var(--success-bg);color:var(--success-text);border:1px solid var(--success-border)}.toast.error{background:var(--danger-bg);color:var(--danger-text);border:1px solid var(--danger-border)}.toast.info{background:var(--warning-bg);color:var(--warning-text);border:1px solid var(--warning-border)}.toolbar{flex-flow:column wrap;gap:8px;margin-bottom:12px;display:flex}@media (width>=600px){.toolbar{flex-direction:row;align-items:flex-start}}.toolbar-group{flex-wrap:wrap;gap:6px;display:flex}.btn{cursor:pointer;white-space:nowrap;border:none;border-radius:8px;padding:8px 16px;font-size:13px;font-weight:600;transition:all .15s}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-success{background:var(--success);color:#fff}.btn-success:hover{background:#16a34a}.btn-warning{background:var(--warning);color:#fff}.btn-warning:hover{background:#d97706}.btn-outline{color:var(--text-secondary);border:1px solid var(--border);background:0 0}.btn-outline:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:#dc2626}.btn-purple{background:var(--purple);color:#fff}.btn-purple:hover{background:var(--purple-hover)}.upload-zone{border:2px dashed var(--border);text-align:center;cursor:pointer;background:var(--bg-secondary);border-radius:10px;margin-bottom:12px;padding:16px;transition:all .2s}.upload-zone:hover{border-color:var(--accent);background:var(--bg-active)}.upload-zone.dragover{border-color:var(--success);background:var(--success-bg)}.upload-zone p{color:var(--text-secondary);font-size:13px}.upload-zone .file-icon{margin-bottom:4px;font-size:24px}.editor-area{grid-template-columns:1fr;gap:12px;display:grid}@media (width>=768px){.editor-area{grid-template-columns:1fr 1fr}}.editor-panel{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;flex-direction:column;display:flex;overflow:hidden}.panel-header{background:var(--bg-tertiary);border-bottom:1px solid var(--border);color:var(--text-secondary);flex-shrink:0;justify-content:space-between;align-items:center;padding:10px 16px;font-size:13px;font-weight:600;display:flex}.panel-header .action-link{color:var(--accent);cursor:pointer;font-weight:500}.panel-header .action-link:hover{color:var(--accent-hover)}.panel-header-right{align-items:center;gap:10px;display:flex}.view-toggle{cursor:pointer;border:1px solid var(--border);color:var(--text-secondary);white-space:nowrap;background:0 0;border-radius:6px;padding:3px 10px;font-size:12px;font-weight:500;transition:all .15s}.lang-tag{background:var(--purple);color:#fff;letter-spacing:.3px;white-space:nowrap;border-radius:4px;padding:2px 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h4{color:var(--text-heading);margin-bottom:8px;font-size:16px;font-weight:600}.feature-card p{color:var(--text-secondary);font-size:13px;line-height:1.6}