/* ============================================
   上诚泵阀 - 转子泵垂直网站样式
   风格：专业 / 工业 / 简洁 / 现代 / 可信
   ============================================ */

/* CSS 变量 */
:root {
  --color-primary: #0a2540;
  --color-primary-light: #1a3a5c;
  --color-accent: #e85d04;
  --color-accent-hover: #c94d00;
  --color-bg: #ffffff;
  --color-bg-soft: #f6f7f9;
  --color-bg-muted: #eef0f3;
  --color-text: #1f2937;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-border: #d1d5db;
  --color-border-light: #e5e7eb;
  --color-success: #047857;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.3;
  color: var(--color-primary);
  font-weight: 700;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

ul, ol {
  margin-top: 0;
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
}

/* 工具类 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section {
  padding: 4rem 0;
}

.section-soft {
  background-color: var(--color-bg-soft);
}

.section-title {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-subtitle {
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 2.5rem;
  font-size: 1.05rem;
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }
.text-primary { color: var(--color-primary); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* 面包屑 */
.breadcrumb {
  background-color: var(--color-bg-soft);
  padding: 0.75rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border-light);
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb a:hover {
  color: var(--color-accent);
}

/* Header */
.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.top-bar {
  background-color: var(--color-primary);
  color: #fff;
  font-size: 0.85rem;
  padding: 0.45rem 0;
  letter-spacing: 0.02em;
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.top-bar a {
  color: #fff;
  font-weight: 600;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 56px;
  width: auto;
}

.logo-brand {
  display: none;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.main-nav a {
  display: block;
  padding: 0.6rem 0.85rem;
  color: var(--color-text);
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-accent);
  background-color: var(--color-bg-soft);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: 0.3s;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: #fff;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.hero-desc {
  color: rgba(255,255,255,0.8);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-actions .btn {
  padding: 0.9rem 1.75rem;
  font-size: 1.05rem;
}

.hero-actions .btn-outline {
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}

.hero-actions .btn-outline:hover {
  background-color: #fff;
  color: var(--color-primary);
}

.hero-image {
  background-color: rgba(30, 58, 95, 0.55);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

.hero-image img {
  max-height: 300px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 12px 24px rgba(0,0,0,0.25));
}

.hero-meta {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-meta-item strong {
  display: block;
  font-size: 1.5rem;
  color: var(--color-accent);
}

.hero-meta-item span {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.75);
}

/* 卡片 */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  aspect-ratio: 4/3;
  background-color: var(--color-bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  overflow: hidden;
}

.card-image a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.card-image img {
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  flex: 1;
}

.card-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-light);
}

.card-link {
  color: var(--color-accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.card-link:hover {
  color: var(--color-accent-hover);
}

/* 特性列表 */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: 0.6rem;
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* 参数表格 */
.data-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background-color: var(--color-bg);
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.data-table th {
  background-color: var(--color-bg-soft);
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.data-table tbody tr:hover {
  background-color: var(--color-bg-soft);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* 信息框 */
.info-box {
  background-color: var(--color-bg-soft);
  border-left: 4px solid var(--color-primary);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
}

.info-box.warning {
  border-left-color: var(--color-warning);
  background-color: #fffbeb;
}

.info-box.danger {
  border-left-color: var(--color-danger);
  background-color: #fef2f2;
}

.info-box.success {
  border-left-color: var(--color-success);
  background-color: #ecfdf5;
}

.info-box-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
  background-color: var(--color-bg-muted);
  color: var(--color-text-secondary);
  margin: 0.15rem;
}

.tag-primary {
  background-color: rgba(232, 93, 4, 0.1);
  color: var(--color-accent);
}

.tag-blue {
  background-color: rgba(10, 37, 64, 0.08);
  color: var(--color-primary);
}

/* 表单 */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.95rem;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.form-control,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(10, 37, 64, 0.1);
}

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

/* 选型结果 */
.selection-result {
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 2rem;
}

.selection-result.empty {
  display: none;
}

.selection-result-title {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

/* 文章 */
.article-content {
  max-width: 820px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border-light);
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content p,
.article-content ul,
.article-content ol {
  margin-bottom: 1.1rem;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

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

.article-content th {
  background-color: var(--color-bg-soft);
  font-weight: 700;
}

/* FAQ */
.faq-item {
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  background-color: var(--color-bg-soft);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 1rem 1.25rem;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-title {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-logo img {
  height: 40px;
  width: auto;
  background-color: #fff;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(255,255,255,0.75);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
}

/* 页面标题区 */
.page-header {
  background-color: var(--color-bg-soft);
  padding: 3rem 0;
  border-bottom: 1px solid var(--color-border-light);
}

.page-header h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 700px;
}

/* 两栏布局 */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.two-column .image-block {
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.two-column .image-block img {
  max-height: 360px;
  object-fit: contain;
}

/* 结构化数据隐藏 */
.script-json-ld {
  display: none;
}

/* 缺失资料标记 */
.data-missing {
  color: var(--color-warning);
  font-style: italic;
}

/* 404 */
.error-page {
  text-align: center;
  padding: 5rem 0;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 1rem;
}

/* 头部搜索 */
.header-search {
  position: relative;
  display: flex;
  align-items: center;
}
.header-search input {
  width: 180px;
  padding: 0.45rem 2.25rem 0.45rem 0.75rem;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  background-color: var(--color-bg-soft);
  transition: width 0.2s ease, border-color 0.2s ease;
}
.header-search input:focus {
  width: 220px;
  outline: none;
  border-color: var(--color-primary-light);
  background-color: var(--color-bg);
}
.header-search button {
  position: absolute;
  right: 0.4rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem;
  color: var(--color-text-muted);
}
.header-search button:hover {
  color: var(--color-accent);
}

/* 搜索页面 */
.search-page-form {
  max-width: 720px;
  margin: 0 auto 2.5rem;
  position: relative;
}
.search-page-form input {
  width: 100%;
  padding: 1rem 3.5rem 1rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  transition: border-color 0.2s ease;
}
.search-page-form input:focus {
  outline: none;
  border-color: var(--color-primary-light);
}
.search-page-form button {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.65rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
}
.search-page-form button:hover {
  background: var(--color-primary-light);
}
.search-results-count {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}
.search-result-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: box-shadow 0.2s ease;
}
.search-result-item:hover {
  box-shadow: var(--shadow-md);
}
.search-result-item h3 {
  margin-bottom: 0.5rem;
  font-size: 1.15rem;
}
.search-result-item h3 a {
  color: var(--color-primary);
}
.search-result-item h3 a:hover {
  color: var(--color-accent);
}
.search-result-item p {
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}
.search-result-item .result-url {
  font-size: 0.85rem;
  color: var(--color-success);
  word-break: break-all;
}
.search-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-text-secondary);
}
.search-empty strong {
  display: block;
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

@media (max-width: 1100px) {
  .header-search {
    display: none;
  }
}

/* 响应式 */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-inner,
  .two-column {
    grid-template-columns: 1fr;
  }
  .hero-image {
    order: -1;
    min-height: 240px;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
    gap: 0;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--color-border-light);
  }
  .mobile-menu-toggle {
    display: block;
  }
  .hero {
    padding: 3rem 0;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .hero-meta {
    flex-direction: column;
    gap: 1rem;
  }
  .grid-4,
  .grid-3,
  .grid-2,
  .form-row {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 2.5rem 0;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .page-header h1 {
    font-size: 1.75rem;
  }
}