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

:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.intro-section {
  padding: 3rem 2rem;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
  border-bottom: 1px solid var(--color-border);
}

.intro-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.intro-content {
  min-width: 0;
}

.intro-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.intro-description {
  font-size: 1.05rem;
  color: #475569;
  line-height: 1.8;
}

.intro-image-wrap {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.intro-image {
  width: 100%;
  max-width: 380px;
  height: auto;
  border-radius: 16px;
  object-fit: contain;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

@media (max-width: 768px) {
  .intro-section {
    padding: 2rem 1.5rem;
  }
  .intro-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .intro-image-wrap {
    order: -1;
  }
  .intro-title {
    font-size: 1.5rem;
  }
}

.search-section {
  padding: 2rem;
  background: var(--color-surface);
}

.search-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.search-form {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--color-surface);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.search-input {
  flex: 1;
  padding: 1rem 1.25rem;
  border: none;
  font-size: 1rem;
  outline: none;
  background: transparent;
}

.search-input::placeholder {
  color: #94a3b8;
}

.search-btn {
  padding: 1rem 1.75rem;
  background: var(--color-primary);
  color: white;
  border: none;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.2s;
}

.search-btn:hover {
  background: var(--color-primary-hover);
}

.breadcrumb-nav {
  padding: 1rem 2rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.breadcrumb-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.breadcrumb-item {
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item:hover {
  text-decoration: underline;
}

.breadcrumb-icon {
  flex-shrink: 0;
}

.breadcrumb-sep {
  color: var(--color-text-muted);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

.back-link {
  color: var(--color-primary);
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.product-title {
  font-size: 1.25rem;
  font-weight: 500;
  margin-top: 0.5rem;
}

.main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

body.product-page .main {
  min-width: 1200px;
  max-width: 1300px;
}

.product-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.product-card {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: visible;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
  display: flex;
  align-items: center;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  border: 1px solid transparent;
}

.product-card-corner {
  position: absolute;
  top: 0;
  right: 0;
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 500;
  color: white;
  background: var(--color-primary);
  border-radius: 0  var(--radius) 0 6px;
}

.product-card:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
  border-color: var(--color-border);
}

.product-card-image {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
  background: #e5e7eb;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.product-card-info {
  flex: 1;
  min-width: 0;
  margin-left: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.product-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

.product-card-brief {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  min-height: 1.4em;
  margin-bottom: 0.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.product-card-tags {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.product-card-tags--multi {
  flex-direction: row;
  flex-wrap: wrap;
}

.product-card-tags--multi .product-tag {
  width: calc(50% - 0.2rem);
}

.product-tag {
  display: inline-block;
  padding: 0.2rem 0.45rem;
  font-size: 0.7rem;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  border-radius: 4px;
  white-space: nowrap;
}

.loading,
.error {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
}

.error {
  color: #dc2626;
}

.product-page-title {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  color: var(--color-text);
}

.product-content {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.product-description {
  margin-bottom: 2rem;
}

.product-description h3,
.flashing-instructions-section h3,
.precautions-section h3,
.must-read-section h3,
.reference-urls-section h3,
.login-info-section h3,
.files-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.flashing-instructions-section,
.precautions-section,
.must-read-section,
.reference-urls-section,
.login-info-section {
  margin-bottom: 2rem;
}

.reference-urls-section ul {
  margin-left: 1.25rem;
  color: var(--color-text-muted);
}

.reference-urls-section li {
  margin-bottom: 0.35rem;
}

.reference-url-link {
  color: var(--color-primary);
  text-decoration: none;
}

.reference-url-link:hover {
  text-decoration: underline;
}

.flashing-instructions-section ul,
.precautions-section ul,
.must-read-section ul {
  margin-left: 1.25rem;
  color: var(--color-text-muted);
}

.flashing-instructions-section li,
.precautions-section li,
.must-read-section li {
  margin-bottom: 0.35rem;
}

.login-info {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius);
  line-height: 1.8;
}

.login-info-value {
  color: var(--color-primary);
}

#version-notice {
  font-size: 20px;
  color: #dc2626;
  font-weight: 500;
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(220, 38, 38, 0.06);
  border-radius: var(--radius);
}

.file-list {
  overflow-x: auto;
}

.file-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.file-table th,
.file-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border: 1px solid var(--color-border);
}

.file-table th {
  background: var(--color-bg);
  font-weight: 600;
}

.file-table-version {
  vertical-align: middle;
  font-weight: 500;
}

.version-latest {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 400;
}

.file-link {
  color: var(--color-primary);
  text-decoration: none;
}

.file-link:hover {
  text-decoration: underline;
}

.product-description p {
  color: var(--color-text-muted);
}

.version-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.version-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.version-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.version-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.version-notice {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.download-btn {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.download-btn:hover {
  background: var(--color-primary-hover);
}

.version-empty {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer {
  background: var(--color-surface);
  padding: 1rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}