/* ===== 全局变量与基础样式 ===== */
:root {
  --primary: #4361ee;
  --primary-dark: #3451de;
  --accent: #e94560;
  --accent-dark: #d93550;
  --success: #28a745;
  --warning: #ffc107;
  --dark: #1a1a2e;
  --dark-light: #16213e;
  --text: #2d3436;
  --text-light: #636e72;
  --bg: #f8f9fa;
  --bg-alt: #f0f4f8;
  --white: #ffffff;
  --border: #e9ecef;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
  --font-main: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}

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

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

body {
  font-family: var(--font-main);
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 干扰标签区块样式 - 肉眼不可见 ===== */
.jammer-block {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  padding: 0;
  margin: -1px;
}

/* ===== 导航栏 ===== */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 15px 0;
  position: relative;
  z-index: 100;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.site-logo .logo-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--white);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-menu a {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 0;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: var(--transition);
}

/* ===== 面包屑导航 ===== */
.breadcrumb {
  padding: 12px 0;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.breadcrumb-list {
  display: flex;
  list-style: none;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.breadcrumb-list li::after {
  content: '>';
  margin-left: 8px;
  color: var(--border);
}

.breadcrumb-list li:last-child::after {
  display: none;
}

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

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

/* ===== 横幅区域 ===== */
.hero-section {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 50%, #0f3460 100%);
  color: var(--white);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(67,97,238,0.1) 0%, transparent 70%);
  animation: heroFloat 15s ease-in-out infinite;
}

@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -20px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.hero-content p {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 35px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(233,69,96,0.4);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255,255,255,0.1);
  color: var(--white);
}

/* ===== 下载输入框 ===== */
.download-box {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius);
  padding: 25px;
  margin-top: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.download-input-group {
  display: flex;
  gap: 12px;
}

.download-input {
  flex: 1;
  padding: 14px 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1);
  color: var(--white);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.download-input::placeholder {
  color: rgba(255,255,255,0.5);
}

.download-input:focus {
  border-color: var(--accent);
}

/* ===== 通用区块 ===== */
.section {
  padding: 70px 0;
  position: relative;
}

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

.section-dark {
  background: var(--dark);
  color: var(--white);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}

.section-dark .section-title h2 {
  color: var(--white);
}

.section-title h2 span {
  color: var(--primary);
}

.section-title p {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-title p {
  color: rgba(255,255,255,0.7);
}

/* ===== 功能模块 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-card .icon-wrap {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
}

.feature-card .icon-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== 步骤展示区 ===== */
.steps-container {
  display: flex;
  gap: 30px;
  align-items: flex-start;
}

.step-item {
  flex: 1;
  text-align: center;
  position: relative;
}

.step-item::after {
  content: '';
  position: absolute;
  top: 100px;
  right: -15px;
  width: 30px;
  height: 2px;
  background: var(--border);
}

.step-item:last-child::after {
  display: none;
}

.step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 auto 15px;
}

.step-image {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 15px;
  box-shadow: var(--shadow);
}

.step-image img {
  width: 100%;
  height: auto;
}

.step-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--dark);
}

.step-item p {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ===== 平台入口 ===== */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 25px 15px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.platform-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.platform-card img {
  width: 60px;
  height: 60px;
  margin: 0 auto 12px;
  border-radius: 12px;
}

.platform-card h4 {
  font-size: 0.9rem;
  color: var(--dark);
}

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.review-info h4 {
  font-size: 0.95rem;
  color: var(--dark);
}

.review-info .stars {
  color: var(--warning);
  font-size: 0.85rem;
}

.review-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== 常见问题 ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.faq-question {
  padding: 18px 25px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--dark);
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question .faq-toggle {
  font-size: 1.2rem;
  transition: var(--transition);
  color: var(--primary);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 25px 20px;
  max-height: 500px;
}

.faq-answer p {
  color: var(--text-light);
  line-height: 1.8;
}

/* ===== 博客/新闻 ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.blog-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.blog-card .thumb {
  height: 160px;
  overflow: hidden;
}

.blog-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.blog-card .blog-body {
  padding: 20px;
}

.blog-card .blog-date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

.blog-card h3 {
  font-size: 1rem;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.5;
}

.blog-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-about .footer-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 15px;
}

.footer-about p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 15px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  transition: var(--transition);
  font-size: 0.85rem;
}

.footer-social a:hover {
  background: var(--primary);
}

.footer-col h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 18px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
}

.footer-col ul a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 25px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.footer-bottom p {
  font-size: 0.85rem;
}

.footer-bottom .footer-links {
  display: flex;
  gap: 20px;
}

.footer-bottom .footer-links a {
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
}

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

/* ===== 内页样式 ===== */
.page-header {
  padding: 50px 0;
  text-align: center;
  background-size: cover;
  background-position: center;
  position: relative;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(26,26,46,0.7);
}

.page-header .container {
  position: relative;
  z-index: 2;
}

.page-header h1 {
  font-size: 2rem;
  color: var(--white);
  margin-bottom: 12px;
}

.page-header p {
  color: rgba(255,255,255,0.8);
  font-size: 1.05rem;
}

/* ===== 教程页面 ===== */
.tutorial-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

.tutorial-content h2 {
  font-size: 1.5rem;
  color: var(--dark);
  margin: 35px 0 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
}

.tutorial-content h3 {
  font-size: 1.2rem;
  color: var(--dark);
  margin: 25px 0 10px;
}

.tutorial-content p {
  margin-bottom: 15px;
  line-height: 1.9;
  color: var(--text);
}

.tutorial-step {
  background: var(--white);
  border-radius: var(--radius);
  padding: 25px;
  margin-bottom: 20px;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow);
}

.tutorial-step .step-label {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.tutorial-step h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--dark);
}

.tutorial-step p {
  color: var(--text-light);
  margin-bottom: 10px;
}

.tutorial-step img {
  border-radius: var(--radius-sm);
  margin-top: 10px;
  box-shadow: var(--shadow);
}

.tip-box {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 20px 0;
}

.tip-box h4 {
  color: #856404;
  margin-bottom: 8px;
}

.tip-box p {
  color: #856404;
  margin-bottom: 0;
}

.download-test-area {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  margin: 30px 0;
  border: 2px dashed var(--primary);
}

.download-test-area h3 {
  margin-bottom: 15px;
}

.comment-section {
  margin-top: 40px;
}

.comment-item {
  display: flex;
  gap: 15px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.comment-item img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  flex-shrink: 0;
}

.comment-body h5 {
  font-size: 0.9rem;
  color: var(--dark);
  margin-bottom: 5px;
}

.comment-body .comment-date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

.comment-body p {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.7;
}

.related-tutorials {
  margin-top: 40px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--white);
  border-radius: var(--radius-sm);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.related-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.related-card h4 {
  font-size: 0.95rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ===== 关于页面 ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-text h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--dark);
}

.about-text p {
  margin-bottom: 15px;
  line-height: 1.9;
  color: var(--text);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
}

.stat-item .stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ===== 隐私政策/联系页面 ===== */
.legal-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

.legal-content h2 {
  font-size: 1.5rem;
  color: var(--dark);
  margin: 30px 0 15px;
}

.legal-content h3 {
  font-size: 1.2rem;
  color: var(--dark);
  margin: 20px 0 10px;
}

.legal-content p {
  margin-bottom: 15px;
  line-height: 1.9;
}

.legal-content ul {
  margin: 10px 0 20px 25px;
}

.legal-content ul li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 30px;
}

.contact-info-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.contact-info-card h3 {
  margin-bottom: 15px;
}

.contact-info-card p {
  margin-bottom: 10px;
}

.contact-form {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-main);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(67,97,238,0.1);
}

.form-group textarea {
  height: 120px;
  resize: vertical;
}

/* ===== 移动端下载页 ===== */
.mobile-download {
  text-align: center;
  padding: 50px 20px;
}

.mobile-mockup {
  max-width: 300px;
  margin: 30px auto;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* ===== 动画效果 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-content {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .steps-container {
    flex-direction: column;
  }
  .step-item::after {
    display: none;
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: var(--shadow);
    border-top: 1px solid var(--border);
  }
  .nav-menu.active {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
  .hero-content h1 {
    font-size: 1.8rem;
  }
  .download-input-group {
    flex-direction: column;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 50px 0;
  }
  .section-title h2 {
    font-size: 1.5rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-content h1 {
    font-size: 1.5rem;
  }
  .hero-section {
    padding: 50px 0;
  }
}

/* ===== 懒加载占位 ===== */
img[loading="lazy"] {
  background: var(--bg-alt);
  min-height: 50px;
}