/* =========================================
   全局变量及基础重置 (CSS Variables & Reset)
========================================= */
:root {
  --primary: #FFB800; /* 亮黄色 / 橙黄色强调色 */
  --primary-hover: #e0a200;
  --dark-bg: #101820; /* 深灰色/黑色工业背景 */
  --darker-bg: #0a0f14;
  --light-bg: #f3f4f6; /* 浅灰色背景 */
  --card-bg: #1f2937; /* 卡片深色背景 */
  --white: #ffffff;
  --text-white: #ffffff;
  --text-light-gray: #d1d5db;
  --text-dark: #1f2937;
  --border-color: rgba(255, 255, 255, 0.1);
  --transition: all 0.3s ease;
  --border-radius: 6px;
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color:var(--light-bg);
  color: var(--text-dark);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}
ul {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}

/* 基础排版与容器 */
h1,
h2,
h3,
h4 {
  line-height: 1.2;
  font-weight: 800;
}
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-padding {
  padding: 5rem 0;
}
.bg-light {
  background-color: var(--light-bg);
}
.text-center {
  text-align: center;
}

.section-tag {
  display: inline-block;
  color: var(--primary-hover);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  text-transform: uppercase;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--dark-bg);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  color: var(--white);
}
.btn-outline {
  background-color: transparent;
  color: var(--white);
 border: 1px solid var(--text-white);
}
.btn-outline:hover {
  background: var(--text-white);
    color: var(--dark-bg);
}
.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* =========================================
   顶部导航栏 (Navbar)
========================================= */
.navbar-wrapper {
  background-color: var(--dark-bg);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.navbar {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-color);
}
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-white);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo-icon {
  color: var(--primary);
  font-style: italic;
  letter-spacing: -2px;
}
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  color: var(--text-white);
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}
.nav-arrow {
  font-size: 0.6rem;
}
.hamburger {
  display: none;
  color: var(--text-white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* 移动端菜单样式 */
.mobile-menu {
  display: none;
  flex-direction: column;
  background-color: var(--darker-bg);
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  padding: 1rem 20px;
  border-top: 1px solid var(--border-color);
}
.mobile-menu.active {
  display: flex;
}
.mobile-menu a {
  color: var(--text-white);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
}
.mobile-menu a:last-child {
  border-bottom: none;
  margin-top: 1rem;
}

/* =========================================
   面包屑导航 (Breadcrumb)
========================================= */
.breadcrumb-bar {
  background-color: var(--darker-bg);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-light-gray);
}

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

.breadcrumb .separator {
  color: var(--border-color);
}

.breadcrumb .current {
  color: var(--primary);
  font-weight: 600;
}

/* =========================================
   产品英雄区 (Product Hero Section)
========================================= */
.product-hero {
  background-color: var(--dark-bg);
  color: var(--white);
  padding: 5rem 0;
}

.product-hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: center;
}

.product-hero-content h1 {
  font-size: 3.2rem;
  color: var(--white);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.product-hero-content p {
  color: var(--text-light-gray);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.hero-features-inline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.feature-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--card-bg);
  padding: 0.875rem 1rem;
  border-radius: var(--border-radius);
  border-left: 3px solid var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--white);
}

.feature-badge i {
  color: var(--primary);
  font-size: 1.1rem;
}

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

.product-hero-image img {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
}

/* =========================================
   快速参数栏 (Quick Specs Bar)
========================================= */
.quick-specs-bar {
  background-color: var(--darker-bg);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 2rem 0;
  color: var(--white);
}

.specs-bar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.spec-item i {
  font-size: 2rem;
  color: var(--primary);
}

.spec-item strong {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light-gray);
  text-transform: uppercase;
  margin-bottom: 0.1rem;
}

.spec-item span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--white);
}

/* =========================================
   产品介绍区块 (Product Introduction Section)
========================================= */
.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.intro-text h2 {
  font-size: 2.3rem;
  color: var(--dark-bg);
  margin-bottom: 1.5rem;
}

.intro-text p {
  color: #4b5563;
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.intro-text em {
  color: var(--primary-hover);
  font-style: normal;
  font-weight: 600;
}

.intro-gallery {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.main-thumb img,
.sub-thumbs img {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

/* =========================================
   技术规格数据表格 (Technical Specifications)
========================================= */
.section-header {
  max-width: 700px;
  margin: 0 auto 3rem auto;
}

.section-header h2 {
  font-size: 2.3rem;
  color: var(--dark-bg);
  margin-bottom: 0.75rem;
}

.section-header p {
  color: #4b5563;
  font-size: 1.05rem;
}

.table-responsive {
  overflow-x: auto;
  background: var(--white);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  border: 1px solid #e5e7eb;
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.tech-table tr {
  border-bottom: 1px solid #e5e7eb;
}

.tech-table tr:last-child {
  border-bottom: none;
}

.tech-table tr:nth-child(even) {
  background-color: #f9fafb;
}

.tech-table td {
  padding: 1rem 1.5rem;
  font-size: 0.95rem;
}

.tech-table .table-label {
  font-weight: 700;
  color: var(--dark-bg);
  width: 30%;
  background-color: rgba(251, 191, 36, 0.05);
}

/* =========================================
   应用领域区块 (Applications Section)
========================================= */
/* 卡片整体微调 */
.app-card {
    background: #ffffff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}
.app-grid {
    display: grid;
    /* 核心：设置 4 列，每列平均分配宽度 (1fr) */
    grid-template-columns: repeat(4, 1fr);
    gap: 20px; /* 卡片之间的间距，可根据需要调整 */
}

/* 顺便加上移动端自适应：在手机上自动变成单列，防止挤压变形 */
@media screen and (max-width: 768px) {
    .app-grid {
        grid-template-columns: 1fr; /* 手机端单列显示 */
    }
}
.app-card:hover {
    transform: translateY(-4px);
}

/* 图片容器：相对定位，用于承载悬浮标题 */
.app-image {
    position: relative;
    width: 100%;
    height: 200px; /* 根据需要调整图片显示高度 */
    overflow: hidden;
}

.app-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

/* 鼠标悬浮图片微放大 */
.app-card:hover .app-image img {
    transform: scale(1.05);
}

/* 图片上的浮动标题美化 */
.app-overlay-title {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px 16px;
    background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0) 100%);
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* 下方文字区域 */
.app-content {
    padding: 16px;
}

.app-content p {
    font-size: 14px;
    color: #4b5563; /* 柔和的灰色，不抢视觉 */
    line-height: 1.5;
    margin: 0;
}

/* =========================================
   为什么选择我们与生产流程区块 (Why & Process)
========================================= */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.why-card {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  border: 1px solid #e5e7eb;
  border-top: 3px solid var(--primary);
}

.why-icon {
  font-size: 2rem;
  color: var(--primary-hover);
  margin-bottom: 1rem;
}

.why-card h3 {
  font-size: 1.1rem;
  color: var(--dark-bg);
  margin-bottom: 0.5rem;
}

.why-card p {
  color: #4b5563;
  font-size: 0.875rem;
}

/* 生产流程步骤样式 */
.process-steps {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.process-step {
  background-color: var(--white);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  flex: 1;
  min-width: 180px;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  border: 1px solid #e5e7eb;
  position: relative;
}

.step-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-hover);
  margin-bottom: 0.5rem;
}

.process-step h4 {
  font-size: 1rem;
  color: var(--dark-bg);
  margin-bottom: 0.25rem;
}

.process-step p {
  color: #4b5563;
  font-size: 0.8rem;
}

.process-connector {
  color: var(--primary-hover);
  font-size: 1.25rem;
}

@media (max-width: 1024px) {
  .process-connector {
    display: none;
  }
  .process-steps {
    flex-direction: column;
  }
}

/* =========================================
   常见问题解答区块 (FAQ Section Accordion Styles)
========================================= */
.faq-section {
  background-color: var(--white);
}

.faq-accordion-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--light-bg);
  border: 1px solid #e5e7eb;
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.faq-question-btn {
  width: 100%;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark-bg);
  cursor: pointer;
  transition: var(--transition);
}

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

.faq-icon {
  font-size: 0.9rem;
  color: var(--primary-hover);
  transition: transform 0.3s ease;
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition:
    max-height 0.3s ease-out,
    padding 0.3s ease-out;
  padding: 0 1.5rem;
  background-color: var(--white);
}

.faq-answer-panel p {
  color: #4b5563;
  font-size: 0.95rem;
  line-height: 1.6;
  padding-bottom: 1.25rem;
}

/* =========================================
   引导转化区 (CTA Banner)
========================================= */
.cta-banner {
  background-color: var(--dark-bg);
  padding: 4rem 0;
  border-top: 1px solid var(--border-color);
}

.cta-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.cta-banner h3 {
  font-size: 1.6rem;
  color: var(--white);
  max-width: 70%;
}

/* =========================================
   FOOTER SECTION
========================================= */
footer {
    background-color: var(--dark-bg);
    color: var(--text-light-gray);
    padding-top: 4rem;
}

.footer-cta {
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    border: 1px solid var(--primary);
    border-radius: var(--border-radius);
    padding: 2.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.cta-text h2 {
    color: var(--text-white);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.cta-btns {
    display: flex;
    gap: 1rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 2rem;
    margin-bottom: 4rem;
}

.brand-col .logo {
    margin-bottom: 1.5rem;
}

.brand-col p {
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.mini-stats {
    display: flex;
    gap: 1.5rem;
}

.mini-stats div {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-white);
}

.mini-stats i {
    color: var(--primary);
    font-size: 1.25rem;
}

.footer-col h4 {
    color: var(--text-white);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col ul li a {
    font-size: 0.875rem;
}

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

.contact-details li {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    font-size: 0.875rem;
}

.contact-details i {
    color: var(--primary);
    margin-top: 0.25rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light-gray);
}

.social-links a:hover {
    background-color: var(--primary);
    color: var(--dark-bg);
    border-color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.legal-links .divider {
    margin: 0 0.5rem;
}
/* =========================================
   响应式设计 (Media Queries)
========================================= */
@media (max-width: 1024px) {
  .specs-bar-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .app-grid,
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .product-hero-grid,
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .product-hero-content h1 {
    font-size: 2.5rem;
  }
}

@media (max-width: 992px) {
  .nav-links,
  .nav-actions {
    display: none;
  }
  .hamburger {
    display: block;
  }
}

@media (max-width: 768px) {
  .specs-bar-grid {
    grid-template-columns: 1fr;
  }
  .hero-features-inline {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .cta-flex {
    flex-direction: column;
    text-align: center;
  }
  .cta-banner h3 {
    max-width: 100%;
  }
}

@media (max-width: 576px) {
  .app-grid,
  .why-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================
   右侧悬浮联系侧边栏 (Floating Sidebar)
   ========================================== */

.floating-sidebar {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 1px; /* 图标之间的细微缝隙 */
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar-item {
    position: relative;
    width: 50px;
    height: 50px;
    background-color: #111827; /* 默认深色背景 */
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sidebar-item a {
    color: #ffffff;
    font-size: 24px;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.sidebar-item:not(.whatsapp):not(.telegram):not(.email):not(.back-to-top) i {
    color: #fff;
}

/* 按钮图标默认颜色 */
.sidebar-item i {
    color: #ffffff;
    font-size: 20px;
}

/* 鼠标悬浮时的品牌色高亮 */
.sidebar-item.whatsapp:hover { background-color: #25D366; } /* WhatsApp 绿 */
.sidebar-item.telegram:hover { background-color: #229ED9; } /* Telegram 蓝 */
.sidebar-item.email:hover { background-color: #FBBF24; }    /* 您的主题黄 */
.sidebar-item.back-to-top:hover { background-color: #4b5563; } /* 返回顶部灰色高亮 */

/* 悬浮提示框 (Tooltip) 的通用样式 */
.sidebar-tooltip {
    position: absolute;
    right: 60px; /* 从右侧往左弹出的距离 */
    top: 50%;
    transform: translateY(-50%) translateX(20px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55); /* 弹性动画 */
    pointer-events: none; /* 防止遮挡鼠标 */
    z-index: 10000;
}

/* 鼠标移入时显示 Tooltip */
.sidebar-item:hover .sidebar-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

/* 带有二维码的提示框样式 */
.qr-tooltip {
    background-color: #ffffff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    border: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.qr-tooltip img {
    width: 120px; /* 二维码大小 */
    height: 120px;
    object-fit: contain;
}

.qr-tooltip span {
    font-size: 13px;
    font-weight: bold;
    color: #374151;
}

/* 纯文本提示框（邮箱）样式 */
.text-tooltip {
    background-color: #FBBF24; /* 匹配邮件悬浮主题色 */
    color: #111827;
    font-weight: bold;
    padding: 12px 16px;
    border-radius: 6px;
    white-space: nowrap; /* 保证邮箱不换行 */
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* 文本提示框的小三角形箭头 */
.text-tooltip::after, .qr-tooltip::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -6px;
    transform: translateY(-50%);
    border-width: 6px 0 6px 6px;
    border-style: solid;
}
.text-tooltip::after { border-color: transparent transparent transparent #FBBF24; }
.qr-tooltip::after { border-color: transparent transparent transparent #ffffff; }

/* ==========================================
   移动端优化 方案二：底部横向固定吸底
   ========================================== */
@media screen and (max-width: 768px) {
    /* 1. 彻底隐藏悬浮二维码和文字提示 */
    .sidebar-tooltip,
    .qr-tooltip,
    .text-tooltip {
        display: none !important;
    }

    /* 2. 将竖排改为底部横排，宽度100%吸底 */
    .floating-sidebar {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        transform: none;
        flex-direction: row;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
        z-index: 99999;
    }

    /* 3. 按钮平分底部宽度，增大点击区域 */
    .sidebar-item {
        flex: 1; /* 四个按钮各占 25% 宽度 */
        height: 55px;
        border-right: 1px solid rgba(255,255,255,0.1); /* 按钮之间的暗色分割线 */
    }

    .sidebar-item:last-child {
        border-right: none;
    }

    .sidebar-item i {
        font-size: 22px;
    }

    /* 为防止底部按钮遮挡网页最下方的内容，给手机端 body 增加底部内边距 */
    body {
        padding-bottom: 60px !important;
    }
}