:root{--primary:#7c3aed;--secondary:#06b6d4;--accent:#fbbf24;--bg:#f9fafb;--card:#ffffff;--text:#1f2937;--muted:#6b7280;--border:#e5e7eb;--success:#10b981}

body.dark-mode{--bg:#0f172a;--card:#1e293b;--text:#f1f5f9;--muted:#94a3b8;--border:#334155}

*{box-sizing:border-box;font-family:'Inter','Segoe UI',system-ui,Helvetica,Arial,sans-serif}
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}
header {
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
body{margin:0;background:var(--bg);color:var(--text)}
header{padding:24px;background:linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);color:#fff;border-bottom:none;box-shadow:0 4px 20px rgba(124, 58, 237, 0.15)}
header h1{margin:0 0 6px 0;font-size:49px;font-weight:700;letter-spacing:-0.5px}
header p{margin:0;font-size:24px;opacity:0.95}
.logo-text{display:inline-block;font-size:15px;opacity:0.8;margin-top:6px;letter-spacing:1px}
main{display:flex;gap:24px;padding:24px;align-items:flex-start}
.controls{width:320px;background:var(--card);padding:25px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,0.08);border:1px solid var(--border)}
.controls label{display:block;margin-bottom:12px;font-size:16px;color:var(--text);font-weight:500}
.controls input[type=file]{display:block;margin-top:6px}
.controls input[type=text], .controls input[type=number], .controls select{width:100%;padding:10px;margin-top:6px;border:1px solid var(--border);border-radius:8px;font-size:16px;transition:border-color 0.2s}
.controls input[type=text]:focus, .controls input[type=number]:focus, .controls select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(124, 58, 237, 0.1)}
.controls input[type=range]{width:100%;cursor:pointer}
.buttons{display:flex;flex-direction:column;gap:8px;margin-top:12px;width:100%}
.buttons button{padding:11px 12px;border-radius:8px;border:0;background:var(--primary);color:#fff;cursor:pointer;font-weight:600;font-size:15px;transition:all 0.2s}
.buttons button:hover:not(:disabled){background:linear-gradient(135deg, var(--primary) 0%, #6d28d9 100%);transform:translateY(-2px);box-shadow:0 4px 12px rgba(124, 58, 237, 0.3)}
.buttons button:nth-child(2){background:var(--secondary)}
.buttons button:nth-child(2):hover:not(:disabled){background:#0891b2;transform:translateY(-2px);box-shadow:0 4px 12px rgba(6, 182, 212, 0.3)}
.buttons button:nth-child(3){background:var(--secondary)}
.buttons button:nth-child(3):hover:not(:disabled){background:#0891b2;transform:translateY(-2px)}
.preview{flex:1;position:sticky;top:18px;max-height:calc(100vh - 36px);overflow-y:auto;padding-right:8px}
.canvas-wrap{background:var(--card);padding:20px;border-radius:12px;display:flex;justify-content:center;align-items:center;min-height:525px;border:1px solid var(--border)}
#preview{max-width:100%;height:auto;border-radius:8px}
.note{font-size:15px;color:var(--muted)}
footer{padding:16px 24px;color:var(--muted);font-size:16px;background:var(--card);border-top:1px solid var(--border);text-align:center}

fieldset{border:1px solid var(--border);border-radius:8px}
legend{color:var(--primary);font-weight:600}

.presets{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.preset-title{width:100%;font-size:15px;color:var(--muted);margin-bottom:8px;font-weight:600}
.preset{padding:8px 12px;border-radius:6px;border:1px solid var(--border);background:var(--card);cursor:pointer;font-size:15px;transition:all 0.2s}
.preset:hover{border-color:var(--primary);background:rgba(124, 58, 237, 0.05)}

.progress-wrap{margin-top:12px}
.progress-bar{height:12px;background:#e5e7eb;border-radius:999px;overflow:hidden}
#progressFill{height:100%;width:0;background:linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);transition:width 0.3s;box-shadow:0 0 8px rgba(124, 58, 237, 0.4)}

.controls.disabled{opacity:0.6;pointer-events:none}

.buttons button:disabled{opacity:0.5;cursor:not-allowed}

#undo, #redo{font-size:24px;font-weight:900;line-height:1;text-shadow:0 0 1px currentColor}

.dark-mode-toggle{position:fixed;top:16px;right:16px;background:#fff;border:2px solid var(--primary);color:var(--primary);width:48px;height:48px;border-radius:50%;cursor:pointer;font-size:24px;display:flex;align-items:center;justify-content:center;transition:all 0.3s;padding:0;z-index:1000;box-shadow:0 4px 12px rgba(0,0,0,0.15)}
.dark-mode-toggle:hover{background:rgba(255,255,255,0.3);transform:scale(1.05)}

body.dark-mode header {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

body.dark-mode .dark-mode-toggle {
  background: #1e293b;
  border-color: var(--secondary);
  color: var(--secondary);
}

@media(max-width:900px){main{flex-direction:column;padding:12px}.controls{width:100%}}