/* ===== 全局变量 ===== */
:root {
  --primary: #0066ff;
  --primary-dark: #0052cc;
  --primary-light: #e6f0ff;
  --dark: #1a1a2e;
  --gray: #6b7280;
  --light-gray: #f5f7fa;
  --border: #e5e7eb;
  --white: #ffffff;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 16px;
  --max-width: 1200px;
}

/* ===== Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

/* ===== 布局容器 ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.section-title p { color: var(--gray); font-size: 16px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  height: 64px;
  display: flex; align-items: center;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.navbar .logo { font-size: 20px; font-weight: 700; color: var(--dark); display: flex; align-items: center; gap: 8px; }
.navbar .logo .logo-img { height: 32px; width: 32px; object-fit: contain; display: block; }
.navbar .logo span { color: var(--primary); }
.navbar nav { display: flex; gap: 32px; }
.navbar nav a { color: var(--dark); font-weight: 500; font-size: 15px; position: relative; }
.navbar nav a:hover, .navbar nav a.active { color: var(--primary); }
.navbar nav a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--primary); border-radius: 2px;
}
.navbar .nav-toggle { display: none; font-size: 24px; cursor: pointer; background: none; border: none; }

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, #0066ff 0%, #00a3ff 100%);
  color: white;
  padding: 140px 0 80px;
  text-align: center;
}
.hero h1 { font-size: 44px; font-weight: 700; margin-bottom: 16px; letter-spacing: 1px; }
.hero p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; }
.hero-buttons .btn { min-width: 140px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 15px; font-weight: 500;
  cursor: pointer; transition: all 0.2s;
  border: 2px solid transparent;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); color: white; transform: translateY(-1px); }
.btn-outline { border-color: white; color: white; background: transparent; }
.btn-outline:hover { background: white; color: var(--primary); }
.btn-outline-blue { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline-blue:hover { background: var(--primary); color: white; }

/* ===== 数据统计 ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 60px 0; }
.stat-item { text-align: center; }
.stat-item .number { font-size: 40px; font-weight: 700; color: var(--primary); }
.stat-item .label { color: var(--gray); margin-top: 4px; }

/* ===== 产品卡片 ===== */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 24px;
  transition: all 0.3s; box-shadow: var(--shadow);
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--primary); }
.product-card .icon { font-size: 40px; margin-bottom: 16px; }
.product-card h3 { font-size: 20px; margin-bottom: 8px; }
.product-card .cat-desc { color: var(--gray); font-size: 14px; margin-bottom: 16px; }
.product-card .product-list { margin-top: 16px; }
.product-card .product-list li { padding: 8px 0; border-bottom: 1px dashed var(--border); font-size: 14px; color: var(--dark); }
.product-card .product-list li:last-child { border-bottom: none; }
.product-card .product-list li strong { display: block; font-size: 15px; }
.product-card .product-list li span { color: var(--gray); font-size: 13px; }
.product-card .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.product-card .tag { background: var(--primary-light); color: var(--primary); font-size: 12px; padding: 2px 8px; border-radius: 4px; }

/* ===== 案例卡片 ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: all 0.3s; box-shadow: var(--shadow);
}
.case-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.case-card .case-header { padding: 24px; background: var(--primary-light); }
.case-card .case-category { display: inline-block; background: var(--primary); color: white; font-size: 12px; padding: 2px 10px; border-radius: 4px; margin-bottom: 8px; }
.case-card h3 { font-size: 18px; margin-bottom: 8px; }
.case-card .case-summary { color: var(--gray); font-size: 14px; }
.case-card .case-body { padding: 20px 24px; }
.case-card .case-body p { font-size: 14px; color: var(--gray); margin-bottom: 12px; }
.case-card .case-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.case-card .case-tag { background: var(--light-gray); color: var(--gray); font-size: 12px; padding: 2px 8px; border-radius: 4px; }
.case-card .case-date { color: var(--gray); font-size: 12px; margin-top: 8px; }

/* ===== 首页新闻预览 ===== */
.news-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-preview-card { background: white; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; transition: all 0.3s; cursor: pointer; box-shadow: var(--shadow); text-decoration: none; color: inherit; display: block; }
.news-preview-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); border-color: var(--primary); }
.news-preview-card .np-category { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 12px; margin-bottom: 12px; background: var(--primary-light); color: var(--primary); }
.news-preview-card h3 { font-size: 16px; margin-bottom: 8px; color: var(--dark); line-height: 1.4; }
.news-preview-card p { color: var(--gray); font-size: 13px; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-preview-card .np-date { color: var(--gray); font-size: 12px; margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--border); }

/* ===== 关于我们 ===== */
.about-hero { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); color: white; padding: 120px 0 60px; text-align: center; }
.about-hero h1 { font-size: 36px; margin-bottom: 12px; }
.about-hero p { opacity: 0.8; font-size: 16px; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-text h2 { font-size: 28px; margin-bottom: 16px; }
.about-text p { color: var(--gray); margin-bottom: 16px; font-size: 15px; }
.about-text ul { margin: 16px 0; }
.about-text ul li { padding: 6px 0; color: var(--dark); }
.about-text ul li::before { content: "✓"; color: var(--success); font-weight: bold; margin-right: 8px; }

/* ===== 联系页面 ===== */
.contact-hero { background: linear-gradient(135deg, #0066ff 0%, #00a3ff 100%); color: white; padding: 120px 0 60px; text-align: center; }
.contact-hero h1 { font-size: 36px; margin-bottom: 12px; }
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h2 { font-size: 24px; margin-bottom: 20px; }
.contact-info .info-item { display: flex; gap: 12px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.contact-info .info-item .icon { font-size: 24px; }
.contact-info .info-item .label { color: var(--gray); font-size: 13px; }
.contact-info .info-item .value { font-size: 16px; font-weight: 500; }

/* ===== 表单 ===== */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 14px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 15px; font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-card { background: white; padding: 32px; border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.form-message { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; display: none; }
.form-message.success { background: #d1fae5; color: #065f46; display: block; }
.form-message.error { background: #fee2e2; color: #991b1b; display: block; }

/* ===== Footer ===== */
.footer { background: var(--dark); color: rgba(255,255,255,0.7); padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-grid h4 { color: white; margin-bottom: 16px; font-size: 16px; }
.footer-grid p { font-size: 14px; line-height: 1.8; }
.footer-grid a { color: rgba(255,255,255,0.7); display: block; padding: 4px 0; font-size: 14px; }
.footer-grid a:hover { color: white; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 13px; }

/* ===== 后台管理 ===== */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar { width: 240px; background: var(--dark); color: white; padding: 24px 0; position: fixed; top: 0; bottom: 0; left: 0; overflow-y: auto; z-index: 100; }
.admin-sidebar .logo { padding: 0 24px 24px; font-size: 18px; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 16px; }
.admin-sidebar nav a { display: block; padding: 12px 24px; color: rgba(255,255,255,0.7); font-size: 14px; transition: all 0.2s; }
.admin-sidebar nav a:hover, .admin-sidebar nav a.active { background: rgba(255,255,255,0.1); color: white; }
.admin-main { margin-left: 240px; flex: 1; padding: 32px; background: var(--light-gray); }
.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.admin-header h1 { font-size: 24px; }
.admin-card { background: white; border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); margin-bottom: 24px; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.admin-table th { background: var(--light-gray); font-weight: 600; }
.admin-table tr:hover { background: var(--light-gray); }
.badge { display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: 12px; }
.badge-pending { background: #fef3c7; color: #92400e; }
.badge-done { background: #d1fae5; color: #065f46; }
.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.admin-stat { background: white; padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); }
.admin-stat .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.admin-stat .lbl { color: var(--gray); font-size: 13px; margin-top: 4px; }
.admin-form-group { margin-bottom: 16px; }
.admin-form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 14px; }
.admin-form-group input, .admin-form-group textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-family: inherit; }
.admin-form-group textarea { min-height: 80px; resize: vertical; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar nav { display: none; }
  .navbar .nav-toggle { display: block; }
  .navbar nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: white; padding: 16px 24px; border-bottom: 1px solid var(--border); gap: 16px; }
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 15px; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .news-preview-grid { grid-template-columns: 1fr; }
  .about-content { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .admin-sidebar { width: 60px; }
  .admin-sidebar .logo { font-size: 12px; padding: 0 8px 16px; }
  .admin-sidebar nav a { padding: 12px 8px; font-size: 12px; text-align: center; }
  .admin-main { margin-left: 60px; padding: 16px; }
  .admin-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 后台可视化编辑器 ===== */
.ve-card { background: white; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 20px; box-shadow: var(--shadow); }
.ve-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.ve-card-header h3 { font-size: 16px; color: var(--dark); }
.ve-card-header .ve-card-actions { display: flex; gap: 8px; }
.ve-btn-danger { background: var(--danger); color: white; border: none; padding: 6px 14px; border-radius: 6px; cursor: pointer; font-size: 13px; }
.ve-btn-danger:hover { opacity: 0.85; }
.ve-btn-small { padding: 4px 12px; font-size: 12px; border-radius: 6px; cursor: pointer; border: 1px solid var(--border); background: white; color: var(--gray); }
.ve-btn-small:hover { border-color: var(--primary); color: var(--primary); }

.ve-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 14px; }
.ve-form-row.full { grid-template-columns: 1fr; }
.ve-form-group { display: flex; flex-direction: column; gap: 4px; }
.ve-form-group label { font-size: 13px; color: var(--gray); font-weight: 500; }
.ve-form-group input, .ve-form-group textarea, .ve-form-group select {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-family: inherit; transition: border-color 0.2s;
}
.ve-form-group input:focus, .ve-form-group textarea:focus, .ve-form-group select:focus {
  outline: none; border-color: var(--primary);
}
.ve-form-group textarea { min-height: 80px; resize: vertical; }

.ve-sub-card { background: var(--light-gray); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 12px; }
.ve-sub-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.ve-sub-card-header h4 { font-size: 14px; color: var(--dark); }
.ve-add-sub-btn { display: inline-block; padding: 8px 16px; background: var(--primary-light); color: var(--primary); border: 1px dashed var(--primary); border-radius: 6px; cursor: pointer; font-size: 13px; margin-top: 8px; }
.ve-add-sub-btn:hover { background: var(--primary); color: white; }

.ve-tags-input { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px; min-height: 38px; align-items: center; }
.ve-tag-item { display: inline-flex; align-items: center; gap: 4px; background: var(--primary-light); color: var(--primary); padding: 2px 8px; border-radius: 12px; font-size: 12px; }
.ve-tag-item .ve-tag-remove { cursor: pointer; opacity: 0.6; font-weight: bold; }
.ve-tag-item .ve-tag-remove:hover { opacity: 1; }
.ve-tag-input { border: none; outline: none; flex: 1; min-width: 100px; font-size: 13px; padding: 4px; background: transparent; }

.ve-upload-area { display: flex; align-items: center; gap: 12px; }
.ve-upload-preview { width: 120px; height: 80px; border: 2px dashed var(--border); border-radius: 8px; display: flex; align-items: center; justify-content: center; overflow: hidden; background: var(--light-gray); flex-shrink: 0; }
.ve-upload-preview img { width: 100%; height: 100%; object-fit: cover; }
.ve-upload-preview video { width: 100%; height: 100%; object-fit: cover; }
.ve-upload-preview .ve-upload-placeholder { color: var(--gray); font-size: 12px; text-align: center; }
.ve-upload-btn { display: inline-flex; flex-direction: column; align-items: center; gap: 4px; }
.ve-upload-btn input[type="file"] { display: none; }
.ve-upload-btn label { display: inline-block; padding: 8px 16px; background: var(--primary-light); color: var(--primary); border-radius: 6px; cursor: pointer; font-size: 13px; transition: all 0.2s; }
.ve-upload-btn label:hover { background: var(--primary); color: white; }
.ve-upload-url { font-size: 12px; color: var(--gray); margin-top: 4px; word-break: break-all; max-width: 200px; }
.ve-upload-clear { color: var(--danger); cursor: pointer; font-size: 12px; margin-top: 4px; }

.ve-rte { border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.ve-rte-toolbar { display: flex; gap: 4px; padding: 8px; background: var(--light-gray); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.ve-rte-toolbar button { padding: 4px 10px; border: 1px solid var(--border); border-radius: 4px; background: white; cursor: pointer; font-size: 13px; min-width: 32px; transition: all 0.15s; }
.ve-rte-toolbar button:hover { background: var(--primary-light); border-color: var(--primary); }
.ve-rte-toolbar button.active { background: var(--primary); color: white; border-color: var(--primary); }
.ve-rte-editor { padding: 12px 16px; min-height: 200px; font-size: 14px; line-height: 1.8; outline: none; }
.ve-rte-editor:empty::before { content: '在此输入内容...'; color: var(--gray); }
.ve-rte-editor h2 { font-size: 18px; margin: 16px 0 8px; }
.ve-rte-editor h3 { font-size: 16px; margin: 12px 0 6px; }
.ve-rte-editor ul, .ve-rte-editor ol { padding-left: 24px; margin: 8px 0; }
.ve-rte-editor li { margin: 4px 0; }
.ve-rte-editor table { width: 100%; border-collapse: collapse; margin: 12px 0; }
.ve-rte-editor table th, .ve-rte-editor table td { border: 1px solid var(--border); padding: 8px 12px; }
.ve-rte-editor table th { background: var(--light-gray); }

.ve-empty { text-align: center; padding: 40px; color: var(--gray); }
.ve-loading { text-align: center; padding: 40px; color: var(--gray); }

@media (max-width: 768px) {
  .ve-form-row { grid-template-columns: 1fr; }
  .ve-upload-area { flex-direction: column; align-items: flex-start; }
}