:root {
  --bg: #f5f7ff;
  --panel: #ffffff;
  --text: #1e1b4b;
  --muted: #64748b;
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --border: #e2e8f0;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 10px 30px rgba(99, 102, 241, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 220px);
  color: var(--text);
}
.hidden { display: none !important; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; gap: 12px; align-items: center; }
.logo {
  width: 42px; height: 42px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), #818cf8);
  color: #fff; display: grid; place-items: center; font-weight: 700;
}
.brand small { display: block; color: var(--muted); margin-top: 2px; }

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
  max-width: 1400px;
  margin: 20px auto;
  padding: 0 20px 40px;
}
.sidebar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
  height: fit-content;
  position: sticky;
  top: 90px;
}
.nav-item {
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text);
  margin-bottom: 6px;
}
.nav-item.active, .nav-item:hover { background: #eef2ff; color: var(--primary-dark); }
.sidebar-tip { margin-top: 16px; color: var(--muted); font-size: 13px; }
.sidebar-tip ul { padding-left: 18px; }

.content { min-width: 0; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.panel h2 { margin: 0 0 8px; }
.desc { color: var(--muted); margin-bottom: 16px; }

.import-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  border: 1px solid var(--border);
  background: #fff;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
}
.tab.active { background: #eef2ff; border-color: #c7d2fe; color: var(--primary-dark); }

.dropzone {
  border: 2px dashed #c7d2fe;
  border-radius: 14px;
  padding: 36px;
  text-align: center;
  background: #fafaff;
}
.dropzone.dragover { border-color: var(--primary); background: #eef2ff; }
.link { border: none; background: none; color: var(--primary); cursor: pointer; text-decoration: underline; }

textarea, select, input[type=text], input[type=password] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
}
#jsonInput { min-height: 220px; margin-bottom: 12px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  background: #fafafa;
}
.card h3 { margin-top: 0; }
.checkbox-grid label {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 14px;
}
.card label { display: block; margin-bottom: 12px; font-size: 14px; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  font: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #e2e8f0; }
.btn-ghost { background: transparent; border: 1px solid var(--border); }
.action-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }

.result-card, .progress-box, .stats, .warnings {
  margin-top: 16px;
  padding: 14px;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
}
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.stat-item { background: #fff; border-radius: 10px; padding: 12px; text-align: center; }
.stat-item strong { display: block; font-size: 24px; color: var(--primary); }

.warning-item {
  padding: 8px 10px;
  border-left: 4px solid var(--warning);
  background: #fff;
  margin-bottom: 8px;
  border-radius: 8px;
  font-size: 13px;
}
.warning-item.success { border-color: var(--success); }
.warning-item.error { border-color: var(--danger); }

.code-preview {
  max-height: 360px;
  overflow: auto;
  background: #0f172a;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 12px;
  font-size: 12px;
}

.file-list, .asset-list { list-style: none; padding: 0; margin: 16px 0 0; }
.file-list li, .asset-item {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; padding: 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px;
}
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--primary-dark);
  font-size: 12px;
}

.modal {
  position: fixed; inset: 0; background: rgba(15,23,42,.45);
  display: grid; place-items: center; z-index: 100;
}
.modal-card {
  width: min(420px, 92vw);
  background: #fff;
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.modal-card label { display: block; margin-bottom: 12px; }

.toast {
  position: fixed; right: 20px; bottom: 20px;
  background: #111827; color: #fff; padding: 12px 16px;
  border-radius: 10px; z-index: 200;
}

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .grid-2, .stats { grid-template-columns: 1fr; }
}