:root, [data-theme="dark"] {
  --bg: #0b0f19;
  --panel-bg: #111827;
  --border: #1f2937;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --accent: #22c55e;
  --radius: 8px;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --panel-bg: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #6b7280;
  --accent: #16a34a;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Outfit', sans-serif; }
body { background: var(--bg); color: var(--text); padding: 40px 20px; display: flex; justify-content: center; }
.app-container { width: 100%; max-width: 650px; display: flex; flex-direction: column; gap: 24px; }
.navbar { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 14px; }
.logo { font-size: 1.15rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.header-controls { display: flex; gap: 8px; align-items: center; }
.theme-btn, .lang-select { background: var(--panel-bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px 10px; font-size: 0.8rem; outline: none; cursor: pointer; display: flex; align-items: center; }

.main-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel-bg); padding: 26px; display: flex; flex-direction: column; gap: 20px; }
.hero-header h1 { font-size: 1.3rem; margin-bottom: 4px; font-weight: 700; }
.hero-header p { font-size: 0.88rem; color: var(--text-muted); }

.qr-layout { display: grid; grid-template-columns: 1fr 220px; gap: 20px; align-items: start; }
.qr-form { display: flex; flex-direction: column; gap: 14px; }
.form-group { display: flex; flex-direction: column; gap: 4px; }
.form-group label { font-size: 0.82rem; color: var(--text-muted); font-weight: 500; }
.form-group input[type="text"] { padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text); font-size: 0.95rem; outline: none; }
.colors-row { display: flex; gap: 14px; }
.colors-row input[type="color"] { width: 44px; height: 38px; border: 1px solid var(--border); border-radius: var(--radius); background: none; cursor: pointer; }

.btn { padding: 10px 16px; font-size: 0.88rem; font-weight: 600; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer; }
.btn:hover { background: var(--border); }

.qr-preview-box { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); padding: 16px; display: flex; flex-direction: column; align-items: center; gap: 14px; min-height: 220px; justify-content: center; }
.qr-preview-box img { width: 180px; height: 180px; border-radius: var(--radius); }
.download-actions { display: flex; gap: 8px; }

.ads-container { width: 100%; min-height: 90px; background: var(--panel-bg); border: 1px dashed var(--border); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; }
.footer { text-align: center; font-size: 0.78rem; color: var(--text-muted); padding: 15px 0; border-top: 1px solid var(--border); }

/* Mobile Responsive */
@media (max-width: 600px) {
  body { padding: 16px 12px; }
  .main-card { padding: 16px; }
  .qr-layout { grid-template-columns: 1fr; }
}