* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f4f6f8;
  color: #222;
}

.topbar {
  background: #111827;
  color: white;
  padding: 28px 40px;
}

.topbar h1 {
  margin: 0;
  font-size: 28px;
}

.topbar p {
  margin: 8px 0 0;
  color: #cbd5e1;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 24px;
}

.sidebar,
.content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.panel {
  background: white;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}

.panel h2 {
  margin-top: 0;
  font-size: 18px;
}

.brand-btn,
.model-btn,
.part-btn {
  width: 100%;
  border: 1px solid #e5e7eb;
  background: white;
  padding: 12px;
  border-radius: 12px;
  text-align: left;
  margin-bottom: 10px;
  cursor: pointer;
}

.brand-btn.active,
.model-btn.active,
.part-btn.active {
  background: #2563eb;
  color: white;
  border-color: #2563eb;
}

.brand-btn.disabled {
  color: #999;
  cursor: not-allowed;
  background: #f3f4f6;
}

.model-list {
  max-height: 450px;
  overflow-y: auto;
}

.part-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.part-btn {
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.part-thumb {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  background: #e5e7eb;
}

.part-btn.active .part-thumb {
  background: rgba(255, 255, 255, 0.2);
}

.search {
  width: 100%;
  padding: 14px;
  border: 1px solid #ddd;
  border-radius: 12px;
  font-size: 15px;
}

.breadcrumb {
  color: #6b7280;
  font-size: 14px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.video-card {
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
}

.repair-video-wrap {
  position: relative;
  background: #000;
}

.repair-video {
  width: 100%;
  height: 260px;
  background: #000;
  display: block;
}

.video-error .video-error-message {
  display: block;
}

.video-error-message {
  display: none;
  padding: 10px 12px;
  background: #fee2e2;
  color: #991b1b;
  font-size: 13px;
}

.repair-video-error {
  display: none;
  height: 260px;
  min-height: 260px;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 16px;
  font-size: 15px;
  color: #b45309;
  background: #fef3c7;
}

.status-uploaded {
  background: #d1fae5;
  color: #065f46;
}

.video-cover {
  height: 180px;
  background: #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6b7280;
  font-size: 18px;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.video-info p {
  margin: 6px 0;
  color: #555;
}

.status {
  display: inline-block;
  margin-top: 8px;
  background: #fef3c7;
  color: #92400e;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
}

.repair-result-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 20px;
}

.panel-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.panel-title-row h2 {
  margin: 0;
}

.product-hint {
  font-size: 12px;
  color: #6b7280;
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.product-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card-link {
  cursor: pointer;
}

.product-card-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
}

.product-card-link:visited {
  color: inherit;
}

.product-image-wrap {
  position: relative;
  height: 180px;
  background: #f3f4f6;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #fff;
}

.product-image-placeholder {
  display: none;
  color: #6b7280;
  font-size: 14px;
}

.product-image-wrap.image-error .product-image {
  display: none;
}

.product-image-wrap.image-error .product-image-placeholder {
  display: flex;
}

.product-info {
  padding: 14px;
}

.product-info h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.product-info p {
  margin: 5px 0;
  color: #555;
  font-size: 14px;
}

.product-tag {
  display: inline-block;
  margin-top: 8px;
  background: #dbeafe;
  color: #1d4ed8;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
}

.product-link-tip {
  margin-top: 8px;
  font-size: 12px;
  color: #2563eb;
}

.product-empty-card {
  border: 1px dashed #d1d5db;
  border-radius: 16px;
  padding: 24px;
  background: #f9fafb;
  color: #6b7280;
  text-align: center;
}

.product-empty-card h3 {
  margin: 0 0 8px;
  color: #374151;
  font-size: 16px;
}

.product-empty-card p {
  margin: 0;
}

@media (max-width: 1100px) {
  .repair-result-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .part-grid,
  .video-grid {
    grid-template-columns: 1fr;
  }
}