/* =============================================
   style.css - 蘑菇WinAll下载资源站
   风格：科技蓝渐变 + 毛玻璃 + 圆角卡片
   响应式 + 暗色模式 + 滚动动画
   ============================================= */

/* 基础重置与全局变量 */
:root {
  --color-primary: #2b5b84;
  --color-primary-dark: #1a3e5c;
  --color-primary-light: #4a90d9;
  --color-accent: #e8f0fe;
  --color-bg: #f9fafb;
  --color-card: #ffffff;
  --color-text: #333333;
  --color-text-light: #555555;
  --color-heading: #1a2a3a;
  --color-border: #e0e6ed;
  --color-glass: rgba(255, 255, 255, 0.75);
  --color-glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  --max-width: 1200px;
}

/* 暗色模式变量 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #5a8fc4;
    --color-primary-dark: #3a6f9e;
    --color-primary-light: #7ab0e0;
    --color-accent: #1e2a3a;
    --color-bg: #121820;
    --color-card: #1c2633;
    --color-text: #e0e6ed;
    --color-text-light: #a0aab4;
    --color-heading: #eef2f6;
    --color-border: #2a3648;
    --color-glass: rgba(28, 38, 51, 0.85);
    --color-glass-border: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  }
}

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

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

body {
  font-family: var(--font);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
}

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

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

ul, ol {
  list-style: none;
}

/* 容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 标题 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--color-heading);
  line-height: 1.3;
  transition: color 0.3s;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  border-bottom: 3px solid var(--color-primary);
  display: inline-block;
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.8rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

/* 按钮通用 */
.btn-primary,
.btn-secondary,
.btn-download {
  display: inline-block;
  padding: 10px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-download {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.btn-download:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 毛玻璃卡片通用 */
.glass-card {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.glass-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ========== 导航 ========== */
header {
  background: var(--color-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-glass-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 20px;
  flex-wrap: wrap;
}

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

.logo svg {
  transition: var(--transition);
}
.logo svg:hover {
  transform: scale(1.02);
}

.nav-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-links a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-links a:hover {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.search-box form {
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.search-box form:focus-within {
  box-shadow: 0 0 0 2px var(--color-primary);
}

.search-box input {
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  font-size: 0.9rem;
  background: var(--color-card);
  color: var(--color-text);
  outline: none;
  width: 180px;
  transition: var(--transition);
}

.search-box input::placeholder {
  color: var(--color-text-light);
}

.search-box button {
  padding: 8px 14px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
}

.search-box button:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--color-primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-menu-toggle:hover {
  background: var(--color-accent);
}

/* ========== 面包屑 ========== */
.breadcrumb {
  background: var(--color-accent);
  padding: 10px 20px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb ol {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--color-text-light);
}

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

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

/* ========== Banner 轮播 ========== */
.banner-carousel {
  position: relative;
  overflow: hidden;
  height: 420px;
  background: linear-gradient(135deg, #e8f0fe 0%, #c5d9f2 100%);
}

@media (prefers-color-scheme: dark) {
  .banner-carousel {
    background: linear-gradient(135deg, #1a2a3a 0%, #2a3a4a 100%);
  }
}

.banner-slide {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transform: scale(1.02);
}

.banner-slide.active {
  opacity: 1;
  transform: scale(1);
}

.banner-slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-text {
  position: absolute;
  top: 50%;
  left: 6%;
  transform: translateY(-50%);
  max-width: 520px;
  z-index: 2;
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 28px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(-50%);
  }
}

.banner-text h1,
.banner-text h2 {
  font-size: 2rem;
  color: var(--color-heading);
  border: none;
  margin-bottom: 0.5rem;
}

.banner-text p {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 1.2rem;
}

.banner-controls {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 16px;
  align-items: center;
  z-index: 3;
}

.banner-prev,
.banner-next {
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  color: var(--color-primary);
  border: 1px solid var(--color-glass-border);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  font-size: 1.4rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-prev:hover,
.banner-next:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.1);
}

.banner-dots {
  display: flex;
  gap: 10px;
}

.dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-glass);
  border: 2px solid var(--color-primary);
  cursor: pointer;
  transition: var(--transition);
}

.dot.active {
  background: var(--color-primary);
  transform: scale(1.2);
  box-shadow: 0 0 12px rgba(43, 91, 132, 0.4);
}

/* ========== 品牌介绍 ========== */
.section-brand {
  padding: 70px 0;
}

.brand-content {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}

.brand-text {
  flex: 2;
  min-width: 300px;
}

.brand-text p {
  font-size: 1.05rem;
  line-height: 1.8;
}

.brand-stats {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  min-width: 260px;
}

.stat-item {
  text-align: center;
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 24px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

/* ========== 企业文化 ========== */
.section-culture {
  background: var(--color-accent);
  padding: 70px 0;
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.culture-item {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.culture-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ========== 产品 ========== */
.section-products {
  padding: 70px 0;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.product-card {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  transform: scaleX(0);
  transition: var(--transition);
}

.product-card:hover::before {
  transform: scaleX(1);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-card svg {
  margin: 0 auto 16px;
  transition: var(--transition);
}

.product-card:hover svg {
  transform: scale(1.1) rotate(-2deg);
}

.product-card h3 {
  margin-bottom: 12px;
}

.product-card p {
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* ========== 优势 ========== */
.section-advantages {
  background: var(--color-accent);
  padding: 70px 0;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.advantage-item {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.advantage-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.advantage-item h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}

/* ========== 解决方案 ========== */
.section-solutions {
  padding: 70px 0;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.solution-card {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 30px;
  border-radius: var(--radius-md);
  border-left: 5px solid var(--color-primary);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.solution-card:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

/* ========== 案例 ========== */
.section-cases {
  background: var(--color-bg);
  padding: 70px 0;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.case-item {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.case-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ========== 评价 ========== */
.section-testimonials {
  background: var(--color-accent);
  padding: 70px 0;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.testimonial-item {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  font-style: italic;
  transition: var(--transition);
  position: relative;
}

.testimonial-item::before {
  content: '"';
  font-size: 3rem;
  color: var(--color-primary);
  opacity: 0.2;
  position: absolute;
  top: 8px;
  left: 16px;
  line-height: 1;
}

.testimonial-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial-item p {
  margin-bottom: 12px;
}

.testimonial-item cite {
  display: block;
  font-style: normal;
  color: var(--color-primary);
  font-weight: 600;
}

/* ========== 文章 ========== */
.section-articles {
  padding: 70px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.article-card time {
  font-size: 0.85rem;
  color: var(--color-text-light);
  display: block;
  margin-bottom: 8px;
}

.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.article-card p {
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.read-more {
  color: var(--color-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.read-more:hover {
  gap: 8px;
  color: var(--color-primary-dark);
}

/* ========== FAQ ========== */
.section-faq {
  background: var(--color-accent);
  padding: 70px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 16px 24px;
  background: var(--color-glass);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-heading);
  transition: var(--transition);
}

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

.faq-question[aria-expanded="true"] {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border-bottom: none;
}

.faq-icon {
  font-size: 1.3rem;
  font-weight: 700;
  transition: var(--transition);
  color: var(--color-primary);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 16px 24px;
  background: var(--color-card);
  border: 1px solid var(--color-glass-border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
  }
  to {
    opacity: 1;
    max-height: 500px;
  }
}

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

.faq-answer p {
  margin-bottom: 0;
}

/* ========== HowTo ========== */
.section-howto {
  padding: 70px 0;
}

.howto-content {
  background: var(--color-glass);
  backdrop-filter: blur(12px);
  padding: 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-md);
}

.howto-intro p {
  font-size: 1.05rem;
}

.howto-steps .step {
  margin-bottom: 24px;
  padding-left: 24px;
  border-left: 4px solid var(--color-primary);
  transition: var(--transition);
}

.howto-steps .step:hover {
  border-left-color: var(--color-primary-light);
  padding-left: 28px;
}

.howto-steps .step h3 {
  color: var(--color-primary);
}

.howto-notes h3 {
  margin-top: 24px;
  color: var(--color-primary);
}

.howto-notes ul {
  margin-left: 20px;
  margin-bottom: 16px;
}

.howto-notes li {
  margin-bottom: 6px;
  list-style: disc;
  color: var(--color-text-light);
}

/* ========== 联系 ========== */
.section-contact {
  background: var(--color-accent);
  padding: 70px 0;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.contact-item {
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-label {
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
  color: var(--color-primary);
  font-size: 0.95rem;
}

.contact-item span:last-child {
  color: var(--color-text-light);
}

/* ========== 网站地图 ========== */
.section-sitemap {
  padding: 70px 0;
}

.sitemap-list {
  columns: 3;
  column-gap: 30px;
}

.sitemap-list li {
  margin-bottom: 10px;
  break-inside: avoid;
}

.sitemap-list a {
  color: var(--color-text);
  transition: var(--transition);
  display: inline-block;
  padding: 2px 0;
}

.sitemap-list a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.sitemap-list ul {
  margin-left: 16px;
  margin-top: 6px;
}

.sitemap-list ul li {
  margin-bottom: 4px;
}

/* ========== 友情链接 ========== */
.section-links {
  background: var(--color-accent);
  padding: 50px 0;
}

.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
}

.friend-links a {
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-glass);
  backdrop-filter: blur(6px);
  border: 1px solid var(--color-glass-border);
  transition: var(--transition);
  font-size: 0.9rem;
  color: var(--color-text);
}

.friend-links a:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ========== Footer ========== */
footer {
  background: linear-gradient(135deg, #1a2a3a 0%, #0d1b2a 100%);
  color: #b0bec5;
  padding: 50px 0 30px;
  position: relative;
}

@media (prefers-color-scheme: dark) {
  footer {
    background: linear-gradient(135deg, #0a0f1a 0%, #141e2a 100%);
  }
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-info,
.footer-eeat {
  flex: 1;
  min-width: 280px;
}

.footer-info p,
.footer-eeat p {
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: #9aa5b0;
}

.footer-info a,
.footer-eeat a {
  color: #7fb3e0;
  transition: var(--transition);
}

.footer-info a:hover,
.footer-eeat a:hover {
  color: #a8d4f0;
  text-decoration: underline;
}

.footer-eeat strong {
  color: #ccd7e0;
}

/* 返回顶部 */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  z-index: 999;
  line-height: 1;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 6px 20px rgba(43, 91, 132, 0.4);
}

/* ========== 滚动动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .banner-text {
    left: 4%;
    max-width: 450px;
    padding: 24px 28px;
  }
  .banner-text h1,
  .banner-text h2 {
    font-size: 1.6rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    margin-top: 12px;
    background: var(--color-glass);
    backdrop-filter: blur(16px);
    border-radius: var(--radius-md);
    padding: 12px;
    border: 1px solid var(--color-glass-border);
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .search-box {
    width: 100%;
    margin-top: 12px;
  }

  .search-box input {
    width: 100%;
  }

  .banner-carousel {
    height: 340px;
  }

  .banner-text {
    left: 5%;
    right: 5%;
    max-width: none;
    padding: 20px 24px;
  }

  .banner-text h1,
  .banner-text h2 {
    font-size: 1.4rem;
  }

  .banner-text p {
    font-size: 0.9rem;
  }

  .brand-content {
    flex-direction: column;
  }

  .brand-stats {
    grid-template-columns: 1fr 1fr;
  }

  .sitemap-list {
    columns: 2;
  }

  h2 {
    font-size: 1.5rem;
  }

  .howto-content {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .banner-carousel {
    height: 280px;
  }

  .banner-text {
    padding: 16px 20px;
  }

  .banner-text h1,
  .banner-text h2 {
    font-size: 1.2rem;
  }

  .banner-text p {
    font-size: 0.85rem;
  }

  .banner-controls {
    bottom: 12px;
    gap: 10px;
  }

  .banner-prev,
  .banner-next {
    width: 34px;
    height: 34px;
    font-size: 1.1rem;
  }

  .dot {
    width: 10px;
    height: 10px;
  }

  .product-grid,
  .advantages-grid,
  .solutions-grid,
  .cases-grid,
  .testimonial-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .brand-stats {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .stat-item {
    padding: 16px 12px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .sitemap-list {
    columns: 1;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
  }

  #back-to-top {
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
    bottom: 20px;
    right: 20px;
  }

  .howto-content {
    padding: 16px;
  }

  .howto-steps .step {
    padding-left: 16px;
  }
}

/* 针对小屏设备优化导航触摸区域 */
@media (max-width: 768px) {
  .nav-links a {
    padding: 10px 16px;
    font-size: 1rem;
  }

  .faq-question {
    padding: 14px 18px;
    font-size: 0.95rem;
  }

  .btn-primary,
  .btn-secondary,
  .btn-download {
    padding: 12px 24px;
    font-size: 1rem;
  }
}

/* 暗色模式额外适配 */
@media (prefers-color-scheme: dark) {
  .banner-carousel {
    background: linear-gradient(135deg, #1a2a3a 0%, #2a3a4a 100%);
  }

  .search-box input {
    background: var(--color-card);
    border-color: var(--color-border);
  }

  .faq-question {
    background: var(--color-glass);
  }

  .faq-answer {
    background: var(--color-card);
  }

  .friend-links a {
    background: var(--color-glass);
  }

  .friend-links a:hover {
    background: var(--color-primary);
  }
}

/* 打印样式 */
@media print {
  header,
  .banner-carousel,
  .banner-controls,
  .mobile-menu-toggle,
  .search-box,
  #back-to-top,
  .section-links,
  footer .footer-eeat {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .container {
    max-width: 100%;
  }

  .glass-card,
  .product-card,
  .advantage-item,
  .solution-card,
  .case-item,
  .testimonial-item,
  .article-card,
  .culture-item,
  .stat-item,
  .contact-item {
    background: #f9f9f9 !important;
    backdrop-filter: none !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }
}