.responsive-tester {
  margin-top: 20px;
  margin-bottom: 40px;
}

.rt-hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
}

.rt-hero p {
  margin: 6px 0 0;
  color: #475467;
}

.rt-hero-stats {
  display: grid;
  gap: 10px;
}

.rt-stat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  min-width: 180px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.04);
}

.rt-stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.rt-toolbar {
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.rt-url {
  display: grid;
  gap: 6px;
}

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

.rt-meta {
  font-size: 12px;
  color: var(--muted);
}

.rt-limit {
  border: 1px dashed var(--line);
  background: #f8fafc;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
  color: #344054;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.rt-limit .btn {
  padding: 6px 10px;
  font-size: 12px;
}

.rt-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  margin-top: 18px;
}

.rt-sidebar .panel {
  position: sticky;
  top: 80px;
}

.rt-device-list {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.rt-device {
  display: grid;
  grid-template-columns: 18px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  font-size: 13px;
}

.rt-device input {
  margin: 0;
}

.rt-device span {
  font-weight: 600;
}

.rt-device small {
  color: var(--muted);
  font-size: 12px;
}

.rt-device .rt-device-actions {
  display: flex;
  gap: 6px;
}

.rt-device button {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
}

.rt-form {
  display: grid;
  gap: 8px;
}

.rt-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.rt-note {
  border-top: 1px dashed var(--line);
  padding-top: 8px;
}

.rt-results {
  display: grid;
  gap: 12px;
}

.rt-message {
  padding: 10px 12px;
  border-radius: 10px;
  background: #f8f9ff;
  border: 1px solid var(--line);
  color: #344054;
  font-size: 13px;
}

.rt-message.hidden {
  display: none;
}

.rt-message .btn {
  margin-left: 8px;
}

.rt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.rt-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
  display: grid;
  gap: 10px;
}

.rt-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.rt-card-title {
  font-weight: 700;
}

.rt-card-meta {
  font-size: 12px;
  color: var(--muted);
}

.rt-card-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.rt-frame {
  background: #0f0f16;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.08);
  overflow: auto;
  position: relative;
}

.rt-frame iframe {
  border: none;
  background: #fff;
  transform-origin: top left;
}

.rt-zoom {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  font-size: 12px;
  color: var(--muted);
  background: #f8fafc;
}

.rt-zoom-label {
  font-weight: 700;
  color: #344054;
}

.rt-zoom-btn,
.rt-zoom-reset {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 4px 8px;
  font-weight: 700;
  cursor: pointer;
  color: #111827;
}

.rt-zoom-value {
  min-width: 44px;
  text-align: center;
  font-weight: 700;
  color: #111827;
}

.rt-frame-hint {
  position: absolute;
  bottom: 8px;
  left: 8px;
  right: 8px;
  background: rgba(15, 18, 37, 0.65);
  color: #fff;
  font-size: 11px;
  padding: 6px 8px;
  border-radius: 8px;
}

.rt-status {
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 980px) {
  .rt-hero {
    flex-direction: column;
    align-items: flex-start;
  }
  .rt-layout {
    grid-template-columns: 1fr;
  }
  .rt-sidebar .panel {
    position: relative;
    top: auto;
  }
}

@media (max-width: 640px) {
  .rt-actions {
    flex-direction: column;
  }
  .rt-form-row {
    grid-template-columns: 1fr;
  }
  .rt-grid {
    grid-template-columns: 1fr;
  }
}