:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-soft: #f9fbff;
  --border: #e6ebf5;
  --text: #1f2a44;
  --muted: #6b7890;
  --primary: #4f7cff;
  --primary-soft: #eef4ff;
  --success: #22b07d;
  --danger: #e15353;
  --warning: #f5a524;
  --shadow: 0 8px 28px rgba(27, 39, 94, 0.08);
  --radius: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }

.page-shell {
  width: min(1360px, calc(100% - 32px));
  margin: 24px auto 32px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.page-title {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.page-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.nav-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 96px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.nav-link.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.grid {
  display: grid;
  gap: 16px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}


.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card-title {
  margin: 0 0 14px;
  font-size: 18px;
}

.kpi-value {
  font-size: 34px;
  font-weight: 700;
}

.kpi-label {
  font-size: 14px;
  color: var(--muted);
  margin-top: 8px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full {
  grid-column: 1 / -1;
}

.label {
  font-size: 14px;
  color: var(--muted);
}

.input,
.textarea,
.select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  padding: 12px 14px;
  color: var(--text);
  outline: none;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 124, 255, 0.12);
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  border: none;
  border-radius: 12px;
  padding: 11px 16px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}

.btn.secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn.success { background: var(--success); }
.btn.warning { background: var(--warning); color: #1f2a44; }
.btn.danger { background: var(--danger); }

.hint {
  font-size: 13px;
  color: var(--muted);
}

.table-wrap {
  overflow: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.table th,
.table td {
  border-bottom: 1px solid var(--border);
  padding: 12px 10px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.table th {
  color: var(--muted);
  font-weight: 600;
  background: var(--surface-soft);
}

.table tr:hover td {
  background: #fbfcff;
}

.empty {
  padding: 24px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 5px 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
}

.feedback-item {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  background: var(--surface-soft);
}

.feedback-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.feedback-text {
  margin: 0 0 14px;
  white-space: pre-wrap;
  line-height: 1.65;
}

.image-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.image-grid img {
  width: 108px;
  height: 108px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
}

.code-box {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 12px;
  padding: 14px;
  overflow: auto;
  font-size: 13px;
  line-height: 1.6;
}

.result-box {
  min-height: 120px;
  white-space: pre-wrap;
}

.status-success { color: var(--success); }
.status-error { color: var(--danger); }

@media (max-width: 980px) {
  .grid-3, .grid-2, .form-row {
    grid-template-columns: 1fr;
  }

  .page-shell {
    width: min(100% - 20px, 1360px);
    margin-top: 16px;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
}