:root {
  --bg: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --success: #10b981;
  --success-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --info: #3b82f6;
  --info-light: #dbeafe;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --transition: .2s ease;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-hover: #334155;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #334155;
  --border-strong: #475569;
  --primary: #818cf8;
  --primary-hover: #6366f1;
  --primary-light: #1e1b4b;
  --success: #34d399;
  --success-light: #064e3b;
  --danger: #f87171;
  --danger-light: #450a0a;
  --warning: #fbbf24;
  --warning-light: #451a03;
  --info: #60a5fa;
  --info-light: #172554;
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.4);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

/* ── Layout ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 480px; margin: 0 auto; padding: 0 24px; }

/* ── Topbar ── */
.topbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(8px);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.topbar-brand {
  display: flex; align-items: center; gap: 12px;
  font-size: 18px; font-weight: 700; color: var(--text); text-decoration: none;
}
.topbar-brand .logo {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--info));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px; font-weight: 800;
}
.topbar-actions { display: flex; align-items: center; gap: 8px; }

/* ── Theme Toggle ── */
.theme-toggle {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-secondary);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 18px; transition: var(--transition); color: var(--text);
}
.theme-toggle:hover { border-color: var(--primary); color: var(--primary); }

/* ── Tabs ── */
.tabs {
  display: flex; gap: 4px; margin-bottom: 24px;
  border-bottom: 2px solid var(--border); padding-bottom: 0;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 10px 20px; border: 0; background: transparent;
  color: var(--text-muted); font-weight: 600; font-size: 14px;
  cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: var(--transition); white-space: nowrap;
  border-radius: var(--radius-xs) var(--radius-xs) 0 0;
}
.tab-btn:hover { color: var(--text-secondary); background: var(--bg-tertiary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ── Cards ── */
.card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; flex-wrap: wrap; gap: 12px;
}
.card-title { font-size: 18px; font-weight: 700; color: var(--text); }
.card-subtitle { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border: 0; border-radius: var(--radius-sm);
  background: var(--primary); color: #fff; font-weight: 600; font-size: 14px;
  cursor: pointer; transition: var(--transition); text-decoration: none;
}
.btn:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn:active { transform: translateY(0); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-hover); }
.btn-success { background: var(--success); }
.btn-success:hover { filter: brightness(.9); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { filter: brightness(.9); }
.btn-info { background: var(--info); }
.btn-info:hover { filter: brightness(.9); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-icon { width: 36px; height: 36px; padding: 0; justify-content: center; }

/* ── Forms ── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; font-weight: 600; color: var(--text-secondary); }
.form-input, .form-select, .form-textarea {
  padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--text); font-size: 14px;
  transition: var(--transition); width: 100%;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light);
}
.form-textarea { min-height: 80px; resize: vertical; }
.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
.form-row > * { flex: 1; min-width: 200px; }

/* ── Table ── */
.table { width: 100%; border-collapse: collapse; }
.table th {
  text-align: left; padding: 12px 16px; font-size: 12px; font-weight: 600;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px;
  border-bottom: 2px solid var(--border);
}
.table td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 14px; }
.table tr:hover td { background: var(--bg-tertiary); }
.table tr:last-child td { border-bottom: 0; }

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 99px; font-size: 12px; font-weight: 600;
}
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info { background: var(--info-light); color: var(--info); }

/* ── Status ── */
.status-msg { padding: 10px 14px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 16px; }
.status-success { background: var(--success-light); color: var(--success); }
.status-error { background: var(--danger-light); color: var(--danger); }
.status-info { background: var(--info-light); color: var(--info); }

/* ── Panels ── */
.panel { animation: fadeIn .3s ease; }
.hidden { display: none !important; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ── Result Box ── */
.result-box {
  white-space: pre-wrap; background: var(--bg); border: 1px solid var(--border);
  padding: 14px; border-radius: var(--radius-sm); color: var(--text);
  font-family: 'JetBrains Mono', 'Fira Code', monospace; font-size: 13px;
  max-height: 400px; overflow: auto; margin-top: 12px;
}

/* ── Product Card ── */
.product-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 16px;
  box-shadow: var(--shadow); transition: var(--transition);
}
.product-card:hover { box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.product-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.product-name { font-size: 16px; font-weight: 700; }
.product-code { font-size: 12px; color: var(--text-muted); }
.product-barcodes { font-size: 13px; color: var(--text-secondary); margin-top: 6px; }

/* ── Config Card ── */
.config-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow);
}
.config-row { display: flex; gap: 12px; align-items: center; margin-bottom: 10px; }
.config-row label { width: 160px; font-size: 13px; font-weight: 600; color: var(--text-secondary); flex-shrink: 0; }
.config-row input { flex: 1; }
.test-area {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; margin-top: 12px;
}

/* ── Verify Portal ── */
.verify-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg); padding: 24px;
}
.verify-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px; max-width: 460px; width: 100%;
  box-shadow: var(--shadow-lg);
}
.verify-title { font-size: 24px; font-weight: 800; margin-bottom: 8px; }
.verify-desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
.verify-step { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; }
.step-dot {
  width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: var(--text-muted);
}
.step-dot.active { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.step-dot.done { border-color: var(--success); color: #fff; background: var(--success); }
.step-line { flex: 1; height: 2px; background: var(--border); }
.step-line.done { background: var(--success); }
.step-label { font-size: 13px; color: var(--text-secondary); }

.key-display {
  background: var(--success-light); border: 1px solid var(--success);
  border-radius: var(--radius-sm); padding: 16px; margin: 16px 0;
}
.key-display code {
  font-family: 'JetBrains Mono', monospace; font-size: 18px; font-weight: 700;
  color: var(--success); word-break: break-all;
}

.channel-btn {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 16px 24px; border: 2px solid var(--border); border-radius: var(--radius);
  background: var(--bg-secondary); cursor: pointer; transition: var(--transition);
  font-size: 14px; font-weight: 600; color: var(--text);
}
.channel-btn:hover { border-color: var(--primary); color: var(--primary); }
.channel-btn .icon { font-size: 24px; }
.channel-btn .target { font-size: 12px; color: var(--text-muted); }

/* ── Login ── */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg); padding: 24px;
}
.login-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px; max-width: 400px; width: 100%;
  box-shadow: var(--shadow-lg);
}
.login-logo {
  width: 56px; height: 56px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--info));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 24px; font-weight: 800; margin: 0 auto 20px;
}
.login-title { text-align: center; font-size: 22px; font-weight: 800; margin-bottom: 28px; }

/* ── Footer Theme Toggle (mobile) ── */
.theme-toggle-fixed {
  position: fixed; bottom: 20px; right: 20px; z-index: 200;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-secondary);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 20px; box-shadow: var(--shadow-lg); transition: var(--transition); color: var(--text);
}
.theme-toggle-fixed:hover { transform: scale(1.1); border-color: var(--primary); color: var(--primary); }

/* ── Empty State ── */
.empty-state { text-align: center; padding: 40px; color: var(--text-muted); }
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .topbar-inner { flex-direction: column; gap: 12px; }
  .form-row { flex-direction: column; }
  .form-row > * { min-width: 100%; }
  .table { display: block; overflow-x: auto; }
  .config-row { flex-direction: column; align-items: flex-start; }
  .config-row label { width: 100%; }
}