:root{--bg:#f8f7f4;--surface:#fff;--border:#e2e0da;--text:#1a1917;--text-muted:#6b6860;--primary:#2d6a4f;--primary-hover:#1b4332;--primary-text:#fff;--secondary-bg:#edf2ef;--secondary-hover:#d8e8df;--error:#c0392b;--radius:8px;--shadow:0 1px 4px #00000014}.dark{--bg:#12110f;--surface:#1e1c1a;--border:#2e2c29;--text:#f0ede8;--text-muted:#8a8680;--primary:#52b788;--primary-hover:#74c69d;--primary-text:#0d1f17;--secondary-bg:#252320;--secondary-hover:#2e2c29}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;line-height:1.6}.app{flex-direction:column;min-height:100vh;display:flex}.app-header{background:var(--surface);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.app-brand{align-items:center;gap:12px;display:flex}.app-icon{font-size:28px}.app-title{letter-spacing:-.3px;font-size:20px;font-weight:700}.app-subtitle{color:var(--text-muted);font-size:13px}.app-main{flex:1;grid-template-columns:340px 1fr;gap:0;width:100%;max-width:900px;margin:32px auto;padding:0 16px;display:grid}@media (width<=680px){.app-main{grid-template-columns:1fr}}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.panel--settings{flex-direction:column;gap:20px;display:flex}.panel--preview{flex-direction:column;align-items:flex-start;gap:20px;margin-left:16px;display:flex}@media (width<=680px){.panel--preview{margin-top:16px;margin-left:0}}.field{flex-direction:column;gap:6px;display:flex}.field-label{text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted);font-size:12px;font-weight:600}.input-number,.input-select{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);color:var(--text);width:100%;padding:8px 10px;font-size:15px}.input-number:focus,.input-select:focus{outline:2px solid var(--primary);outline-offset:1px}.segmented{border:1px solid var(--border);border-radius:var(--radius);display:flex;overflow:hidden}.seg-btn{background:var(--bg);color:var(--text-muted);cursor:pointer;border:none;flex:1;padding:8px;font-size:14px;font-weight:500;transition:background .15s,color .15s}.seg-btn+.seg-btn{border-left:1px solid var(--border)}.seg-btn--active{background:var(--primary);color:var(--primary-text)}.seed-display{flex-direction:column;gap:6px;display:flex}.seed-row{align-items:center;gap:6px;display:flex;overflow:hidden}.seed-hex{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;background:var(--bg);border:1px solid var(--border);border-radius:4px;flex:1;padding:4px 6px;font-family:monospace;font-size:11px;overflow:hidden}.seed-hint{color:var(--text-muted);font-size:12px}.btn-primary{background:var(--primary);color:var(--primary-text);border-radius:var(--radius);cursor:pointer;border:none;flex:1;padding:12px 20px;font-size:15px;font-weight:600;transition:background .15s}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-secondary{background:var(--secondary-bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;flex:1;padding:10px 16px;font-size:14px;font-weight:500;transition:background .15s}.btn-secondary:hover:not(:disabled){background:var(--secondary-hover)}.btn-secondary:disabled{opacity:.55;cursor:not-allowed}.btn-icon{background:var(--secondary-bg);color:var(--text-muted);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;white-space:nowrap;flex-shrink:0;padding:6px 10px;font-size:13px}.btn-icon:hover{background:var(--secondary-hover)}.action-row{flex-direction:column;gap:8px;display:flex}.action-links{align-items:center;gap:10px;display:flex}.action-links-sep{color:var(--text-muted);font-size:13px}.link-btn{color:var(--text-muted);cursor:pointer;text-underline-offset:3px;background:0 0;border:none;padding:0;font-size:13px;text-decoration:underline}.link-btn:hover:not(:disabled){color:var(--text)}.link-btn:disabled{opacity:.4;cursor:not-allowed}.error-toast{border-radius:var(--radius);color:var(--error);background:#fdf0ee;border:1px solid #f5c6c2;padding:10px 14px;font-size:14px}.dark .error-toast{background:#2a1512;border-color:#5a2020}.preview-panel{flex-direction:column;gap:8px;display:flex}.preview-frame{border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.preview-note{color:var(--text-muted);font-size:12px}.smart-mode-lock{border:1px dashed var(--border);border-radius:var(--radius);text-align:center;opacity:.75;width:100%;padding:20px;position:relative}.smart-mode-icon{margin-bottom:8px;font-size:28px}.smart-mode-title{margin-bottom:6px;font-size:16px;font-weight:600}.smart-mode-desc{color:var(--text-muted);font-size:14px;line-height:1.5}.smart-mode-badge{background:var(--primary);color:var(--primary-text);border-radius:20px;padding:2px 7px;font-size:11px;font-weight:700;position:absolute;top:10px;right:10px}.settings-panel{flex-direction:column;gap:16px;display:flex}.app-footer{text-align:center;color:var(--text-muted);border-top:1px solid var(--border);flex-wrap:wrap;justify-content:center;gap:16px;padding:16px 24px;font-size:13px;display:flex}.app-footer a{color:var(--primary);text-decoration:none}.app-footer a:hover{text-decoration:underline}